JPH0531398Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an exhaust pipe disconnection detection device that detects exhaust pipe disconnection by passing a minute current through the exhaust pipe.

BACKGROUND OF THE INVENTION With the recent occurrence of poisoning accidents due to disconnection of combustor exhaust pipes, it has become necessary to detect disconnection of exhaust pipes, etc.

As a conventional technique for detecting exhaust pipe dislocation, there is a technique shown in FIGS. 4 and 5.

In the figure, 1 is a combustor main body, 10 is an air supply and exhaust pipe, 103 is an air supply pipe, and 104 is an exhaust pipe. The air supply pipe 103 is made of a flexible hose made of a coiled metal wire coated with a synthetic resin, and the air supply/exhaust tube 102 made of a conductive material such as stainless steel, the exhaust pipe 104, and the main body 1 constitute an electrical closed circuit.

If each end of the air supply pipe 103 and the exhaust pipe 104 are properly connected to the connection port of the main body 1, the electrical closed circuit will be in a state where the safety switch is closed, and the combustion control circuit will function normally. Air supply pipe 103 or exhaust pipe 10
If the exhaust pipe 4 comes off from the main body 1, the electrical closed circuit opens the safety switch, detects the exhaust pipe coming off, and shuts off the combustion control circuit to stop combustion.

(For example, Japanese Utility Model Publication No. 58-27255) Problems to be solved by the invention According to the above configuration, the air supply pipe 103 and the exhaust pipe 1
Even if 04 and main unit 1 are electrically connected, main unit 1
If the exhaust pipe 104 and the exhaust pipe 104 are connected with metal touch, the airtightness may be incomplete and exhaust gas may leak into the room. Therefore, generally, the main body 1 and the exhaust pipe 104 are connected through an O-ring to make the connection completely airtight, but since the main body 1 and the exhaust pipe 104 are connected through the O-ring, The drawback was that no current would flow through the exhaust pipe, causing a false detection that the exhaust pipe was disconnected, which could cause combustion to stop.

Means for Solving the Problems The present invention was made to eliminate the above-mentioned drawbacks, and it connects the main body and the exhaust pipe with a retaining metal fitting having an appropriate number of protrusions so that it can be press-fitted between the ribs of the exhaust pipe. It is set up in the department.

Function With the above structure, the exhaust pipe is fixed and prevented from coming off by attaching the retaining metal fitting, and even when the connection is made airtight using an O-ring, the retaining metal fitting does not come off. The purpose of the present invention is to provide a device in which the protrusion of the exhaust pipe and the rib of the exhaust pipe come into contact with each other so that a current can flow reliably.

Embodiment Fig. 1 is a diagram of the supply and exhaust pipe connection structure in which an embodiment of the exhaust pipe disconnection detection device of the present invention is applied, Fig. 2 is a structural diagram of the exhaust pipe attachment part at the rear of the combustor main body, and Fig. 3 is the FIG. 3 is a perspective view of the retaining metal fitting.

In the figure, 1 is the combustor main body, 2 is the supply and exhaust pipe,
3 is an air supply pipe, and 4 is an exhaust pipe, and the air supply and exhaust pipe 2 made of stainless steel and the exhaust pipe 4 are electrically connected to each other. 5 and 5a are two ribs provided at the end of the exhaust pipe 4, and 6 is an O-ring inserted into the rib 5 on the side of the main body 1. 7 is the exhaust pipe connection port of the main body 1,
8 is the rear part of the cabinet of the main body 1. 9 is a retaining metal fitting, and 10 is a retaining metal fitting 9 attached to ribs 5, 5a.
An appropriate number of protrusions with a protruding height dimension that can be attached by press-fitting between the protrusions. Reference numeral 11 denotes a screw for attaching the retaining fitting 9 to the rear part 8 of the cabinet. 12 is a lead wire connecting the retaining fitting 9 and the controller 14, and 13 is a lead wire connecting the air supply/exhaust pipe 2 and the controller 14.

The operation of this embodiment having the above configuration will be explained.

Connect the exhaust pipe 4 to the exhaust pipe connection port 7 via the O-ring 6.
By connecting the two, this connection becomes completely airtight. By press-fitting the retaining fitting 9 between the ribs 5 and 5a and attaching it to the rear part 8 of the cabin with the screw 11, the exhaust pipe 4 is fixed so that it will not come off, and
Since the protrusion 10 and the rib 5a are electrically connected reliably, a closed circuit is formed that connects to the controller 14 via the controller 14, lead wire 12, stopper fitting 9, exhaust pipe 4, and supply/exhaust tube 2. The combustion control circuit 14 functions normally without erroneously recognizing that the tube has come off. If the exhaust pipe 4 is disconnected or the retaining fitting 9 is forgotten to be attached, the projection 10 and the rib 5a are disconnected, the exhaust pipe is detected as disconnected, and the control circuit 14 stops combustion.

Effects of the invention As described above, according to the invention, since a retaining fitting having a protrusion is provided at the connection part between the main body and the exhaust pipe,
In addition to ensuring that the exhaust pipe does not come off, even if an O-ring is used to make the connection completely airtight, continuity between the retaining fitting and the exhaust pipe can be ensured, resulting in highly reliable exhaust that will not malfunction. This has the effect of configuring a tube disconnection detection device.

[Brief explanation of the drawing]

Figure 1 is a diagram of the connection structure of the supply and exhaust pipes equipped with an exhaust pipe disconnection detection device showing one embodiment of the present invention, Figure 2 is a structural diagram of the exhaust pipe attachment section at the rear of the combustor main body, and Figure 3 is a diagram of the connection of the exhaust pipe with an exhaust pipe disconnection detection device. FIG. 4 is a side view showing a conventional example, and FIG. 5 is a closed circuit diagram of the same safety switch. 1... Main body, 4... Exhaust pipe, 5, 5a... Rib, 9... Retaining metal fitting, 10... Protrusion.

Claims (1)

[Scope of utility model registration request] In an exhaust pipe disconnection detection device that detects whether the exhaust pipe is disconnected by passing a small current through the exhaust pipe, a retaining fitting 9 is provided at the connection between the combustor main body 1 and the exhaust pipe 4,
The ribs 5, 5 at the end of the exhaust pipe 4 are attached to this retaining metal fitting 9.
An exhaust pipe disconnection detection device characterized in that an appropriate number of protrusions 10 are provided between the space a and have a size in which a retaining metal fitting 9 can be press-fitted.