JPH048684B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Technical Field of the Invention> The present invention relates to a combustion device equipped with a guide pipe for guiding a sensor for detecting incomplete combustion.

<Prior art> As a conventional combustion device, for example,
As shown in Publication No. 42354, an ignition device that airtightly penetrates the through hole of a combustion cylinder and is installed by penetrating the through hole of a burner made of wire mesh disposed inside the combustion cylinder with a gap. Some have a main guide. Alternatively, it is also known that a sensor for detecting incomplete combustion in the burner section is attached via a guide tube for attaching the sensor.

In both of these, the guide member is a supporting frame (mixing chamber cover) connected to the mixing pipe of the burner.
It is provided facing into the combustion section by passing through the support frame and being fixed or elastically supported by the support frame.
That is, since the guide member is supported only by the through-mounting portion of the support frame and passes through it with a gap from the through hole provided in the burner, it is supported only at one location of the support frame. The configuration is as follows.

For this reason, when the guide member is fixed to the support frame by spot welding, the guide member may be fixed in an inclined state, or the guide member may be inclined due to the inclination of the mounting surface of the support frame. Problems may occur, such as the product becoming stuck in place.

When the guide member is tilted and fixed in this way,
For example, the accuracy of the positional relationship of the sensor within the burner is impaired. Also, for this reason, as the burner made of wire mesh or the like expands, the guide member and the inner circumferential end surface of the burner through hole that the guide member should pass through with a gap come into contact, and the guide member The burner cannot slide smoothly, and this causes problems such as a large load being applied to the burner and causing deformation.

<Objective of the Invention> Therefore, the main object of the present invention is to solve the above-mentioned problems of the prior art and to ensure sufficient accuracy in the mounting positional relationship of sensors, etc. for detecting incomplete combustion in a combustion device. It is in.

<Means for Achieving the Object> In order to achieve the above object, the present invention provides a guide tube for attaching a sensor in a combustion device to one place in the penetration part of the combustion tube, and in the penetration part of the combustion tube and the penetration part of the burner. The structure is such that it is supported at one location at the penetrating portion of the support frame disposed between the two locations, and at two locations in total.

<Embodiments of the Invention> Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

In FIG. 1, reference numeral 1 denotes a burner, which has a cylindrical peripheral wall with a large number of flame holes, the opening at one end of which is closed by a closing cap 5, and the opening at the other end serving as a combustion gas outlet 3.

2 is a combustion tube, and a combustion gas outlet 3 of the burner 1
By covering the outer periphery of the burner 1 except for the opening at the other end with a space, a mixture passage 4 for passing a mixture of air and combustion gas is formed around the outer periphery of the burner 1.
A mixing chamber 7 is formed above the closing gap 5 of the burner 1.

The burner 1 has a cylindrical wire mesh structure, and a spherical closing cap 4 is attached to the upper opening of the burner 1.
An annular cap 6 is fixed to the lower opening to form a frame. Further, the combustion tube 2 has its lower opening closed by the annular cap 6, and the upper part serves as a mixing chamber cover 8,
This forms a mixing chamber 7 for fuel gas and air, and the upper opening communicates with a throat (mixing tube) to be described later. Incidentally, at a predetermined location of the mixing chamber cover 8 constituting the top wall of the combustion cylinder 2, there is a through hole 8a through which a guide pipe for center attachment, which will be described later, is attached.
will be established. Reference numeral 9 denotes a throat (mixing pipe) that communicates with the inside of the mixing chamber 7, and has an inlet 9a formed at one end. 10 is a fuel injection nozzle; 11 is a spark plug protruding into the burner 1; 12 is a second spark plug disposed above the closed cap 5 to partition the mixing chamber 7 and the mixture passage 4; This is a pressure equalizing plate that also serves as a supporting frame body, and has a hole 12a for air-fuel mixture circulation in the center, and a guide tube for sensor attachment at a position approximately directly below the through hole 8a of the mixing chamber cover 8. A through hole 12b is provided through which is supported.

On the other hand, 13 is a sensor installed inside burner 1 to detect incomplete combustion in the burner 1 section, and is made of a semiconductor whose resistance value changes in response to oxygen partial pressure within a specified temperature range. be. Reference numeral 14 denotes a sensor mounting guide tube that guides the sensor 13 so as to be installed inside the burner 1, and is installed and supported through the through hole 8a of the mixing chamber cover 8, and extends a predetermined distance from the through hole 8a. It is supported by passing through the through hole 12b of the pressure equalizing plate 12 separated therefrom, and furthermore, its tip passes through the through hole 5a of the closing cap 5 with a gap via a ring washer or the like and projects into the burner 1. ing.

The mounting portion of the guide tube 14 will be described in more detail with reference to FIG.
A is provided between the flange portion 14a and the outer surface of the top wall of the mixing chamber cover 8, and a donut-shaped mounting plate 16 is screwed and fixed from the outside with a gasket 15 interposed between the flange portion 14a and the outer surface of the top wall of the mixing chamber cover 8. A mixing chamber cover 8, which also serves as a support frame, is fixed. Further, the guide tube 14 is supported by passing through the through hole 12b of the pressure equalizing plate 12, which is disposed at a predetermined distance from the fixed portion downward in the axial direction of the guide tube 14. At this time, since the inner diameter of the through hole 12b is formed to have approximately the same size as the outer diameter of the guide tube 14, movement of the guide tube 14 in the axial direction is allowed, but so-called lateral movement is prevented. Therefore, the guide tube 14 is also supported by this through hole 12b,
It is supported at two locations including the through hole 8a.

In the above embodiment, the mounting plate 16 and the packing 2
5 constitutes the support device of the present invention.

Next, the operation of such a combustion device will be explained.

The fuel gas ejected from the nozzle 10 is fed to the intake port 9.
It is led from a to the throat 9. At this time, primary air necessary for combustion of the fuel is sucked into the throat 9 by the ejector action. The fuel gas ejected into the throat 9 mixes with this primary air. This air-fuel mixture is further mixed in the mixing chamber 7, guided to the air-fuel mixture passage 4, and subjected to combustion in the combustion section. Incomplete combustion is prevented based on the detection output from the sensor 13 that detects the combustion state in this combustion section.

Here, the sensor 13 is required to improve the accuracy of its mounting position, but according to the present embodiment, the guide tube 14 for mounting the sensor 13 is aligned with the through hole 8a of the mixing chamber cover 8. Since it is supported at two points with the through hole 12b of the pressure plate 12, there is no problem such as the sensor 13 being installed at an angle, compared to the conventional case where it is supported at one point, such as the mixing chamber cover. The accuracy of the mounting device for the sensor 13 is significantly improved.

Furthermore, in this embodiment, the pressure equalizing plate 12 used conventionally is used without adding a new support frame as the second support member, and the pressure equalizing plate 12 has a size that is approximately the same as the outer diameter of the guide tube 14. Since the configuration is such that only the through hole 12b is provided, it is possible to obtain the effect that inconveniences such as an increase in the number of parts and a complicated manufacturing process are not caused.

Furthermore, since the accuracy of the mounting position of the guide tube 14 is improved, a gap of a predetermined width between the inner circumferential end surface of the through hole 15a of the closing cap 5 and the guide tube 14 is secured, so that the guide tube 14 and the inside of the through hole 5a are secured. There is no problem with sliding with the peripheral end surface. For this reason,
No extra load is applied to the burner 1, and the burner 1 is not deformed not only during manufacture but also during expansion when the burner 1 becomes red hot.

FIG. 3 shows a different embodiment of the support device for the guide tube to the first support frame, in which the inner peripheral end of a mounting plate 36 made of an elastic material is fitted into the groove of the guide tube 34. It is shown attached to the mixing chamber cover 8 via the gasket 35 in the closed state.

In addition to the sealing function, the gasket 15 used in the first embodiment also has the function of absorbing the inclination of the mounting surface or the inclination of the guide tube 14 during installation, and in the embodiment shown in FIG. The mounting plate 36 has the effect of absorbing the inclination of the mounting surface of the mixing chamber cover 8. Any of the embodiments has a function of absorbing errors in mounting dimensions, and can ensure higher accuracy in mounting positional relationship.

Further, in this embodiment, a guide tube for mounting a sensor for detecting incomplete combustion has been described, but it is clear that the present invention is not limited to this.

<Effects of the Invention> As explained above, according to the present invention, the guide tube of the sensor, etc. is supported at two points, and the guide tube is prevented from being installed at an angle.
Accuracy in the mounting position of sensors, etc. installed inside the combustion section can be ensured.

In addition, since the mounting position accuracy is increased, smooth sliding between the guide tube and the burner penetrating part can be ensured, so no extra load is applied to the burner, etc., and therefore deformation of the burner etc. can be prevented. Effects can also be obtained. In particular, according to the present invention, since a support device is provided that surrounds and supports the guide tube in the combustion tube in an airtight manner and can absorb the inclination of the guide tube or the guide tube mounting surface, errors in the mounting dimensions of the guide tube can be absorbed. This has the advantage of ensuring high accuracy in the mounting position relationship.

[Brief explanation of drawings]

The drawings show one embodiment of the combustion apparatus according to the present invention, in which FIG. 1 is an overall configuration diagram, FIG. 2 is a sectional view of a main part, and FIG. 3 is a sectional view of a main part of another embodiment. DESCRIPTION OF SYMBOLS 1...Burner, 2...Combustion tube, 5...Closing cap, 8...Mixing chamber cover that also serves as a first support frame, 8a...Through hole, 9...Mixing tube, 12... A pressure equalizing plate that also serves as a second support frame, 12b... through hole, 13... sensor, 14... guide tube, 15, 35... packing, 16, 36... mounting plate.

Claims (1)

[Scope of Claims] 1. A combustion tube 2, a burner 1 disposed in the combustion tube 2, and a combustion tube that penetrates the through hole 8a of the combustion tube 2 and the through hole 5a of the burner 1 into the burner 1. a guide tube 14 protruding from the through hole 5 of the burner 1;
In a combustion device that is attached to a penetration part that includes the through hole 8a of the combustion tube 2, the combustion tube penetration part that includes the through hole 8a of the combustion tube 2 has a predetermined distance from the inner peripheral end surface of the combustion tube 2. In contrast, the guide pipe 14 is connected to the combustion tube 2.
Support devices 15, 16, 35, and 36 are provided to airtightly surround and support the guide tube 14 or the guide tube mounting surface so as to absorb the inclination of the guide tube 14, and a through hole of the combustion tube 2 through which the guide tube 14 is passed. 8a and the through hole 5a of the burner 1, passing through the guide tube 14 and surrounding and supporting it;
A support frame 12 having a through hole 12b having a cross-sectional outline and the same size as the guide tube 14 is fixed to the inner wall of the combustion tube 2, and a sensor 13 is inserted into the guide tube 14. A combustion device characterized in that it is held in place.