JPS5850155Y2 - Supply and exhaust stack of supply and exhaust type combustion equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a supply/exhaust type combustion device used in a heating device or the like, and particularly to a structure for preventing removal of an intake/exhaust pipe.

The supply and exhaust pipe of the supply and exhaust type combustion device has a piping structure with double inner and outer pipes as shown in Fig. 1, with the inside of the inner pipe 1 serving as the exhaust passage 3, and the air supply and exhaust pipe between the inner pipe 1 and the outer pipe 2. A device with an air passageway 4 is known.

In this supply/exhaust cylinder, the inner cylinder and the outer cylinder, that is, the exhaust cylinder 1 and the supply cylinder 2, are each divided into a fixed side and a movable side, and are divided into a fixed inner/outer cylinder IA, 2A and a movable inner/outer cylinder IB, 2B. are slidably overlapped with each other, so that the overall axial length of the air supply and exhaust pipe can expand and contract depending on the thickness of the partition wall 5.

The movable inner cylinder 1B and the fixed outer cylinder 2A are provided with locking protrusions 6 and 7, respectively.For example, when the fixed inner and outer cylinders IA and 2A are inserted into the movable inner and outer cylinders IB and 2B, the locking protrusions are provided. The part 7 is elastically deformed, climbs over the suspension protrusion 6, returns to its original shape on the opposite side of the protrusion 60, and locks the protrusion 6 with the protrusion 7, thereby allowing movement in and out. The movement of the cylinders IB and 2B in the extending direction is restricted, and the movable inner and outer cylinders IB and 2B are prevented from being pulled out.

However, in such a conventional removal prevention structure, there may be variations in the dimensions of the locking protrusion 7 during manufacture, or the locking protrusion 7 on the outer cylinder side may be used several times, that is, the distal end claw of the locking protrusion 7 may It was difficult to obtain a stable removal prevention effect due to deformation of 7A.

Therefore, in view of the above-mentioned conventional circumstances, the present invention has been devised to make a simple improvement in the shape of the locking protrusion on the outer cylinder side so that the removal prevention function can be maintained reliably and over a long period of time. The purpose is to provide an air supply and exhaust pipe with a

In order to achieve this purpose, the structure of the present invention is to divide the inner and outer double cylinder structure of the interconnected supply cylinder and exhaust pipe into two at the axial middle part, and to make the outer cylinders of the two divided bodies mutually In the supply/exhaust pipe of a supply/exhaust type combustion device, which is configured so that the inner cylinders can slide freely in the axial direction and overlap each other so that the entire length can be freely expanded and contracted, there is an elastically easily attached inside of the outer cylinder of one of the divided bodies. A plurality of locking protrusions having a shape that does not deform are provided, and a locking protrusion having a shape that can be engaged with the locking protrusions in the axial direction and does not easily deform elastically is provided on the outside of the inner cylinder of the other divided body. When the divided bodies overlap each other, the outer cylinder provided with the locking protrusion is elastically expanded in the direction perpendicular to the axis, and the locking protrusion engages the corresponding locking protrusion of the inner cylinder, and the supply/discharge is performed. The structure is such that the two locking protrusions come into contact with each other when the cylinder is extended, thereby regulating the overall length.

Hereinafter, one embodiment of the present invention will be described based on FIGS. 2 to 4.

In FIG. 2, 10 is a through hole formed in a wall 11 that partitions the inside and outside of the building, 12 is an intake and exhaust pipe fitted and supported in the through hole 10, 13 is an intake cylinder, and 13A is a support flange 14. A fixed outer cylinder is supported by the wall 11 through the movable outer cylinder 13B, a movable outer cylinder is fitted to the outer circumference of the end of the fixed outer cylinder 13A so as to freely slide in the axial direction, and 15 and 16 are the outer circumference of the outer end of the movable outer cylinder 13B. 17 is an air supply outlet opened on the outer periphery of the inner end of the fixed outer cylinder; 18 is an air supply pipe that leads to an air supply port of a heating device (not shown); 19 is an air supply hole; An exhaust pipe has a double structure concentrically inside the cylinder 13, and 19A is a fixed inner cylinder supported by the supply cylinder 13 via 20 support pieces, and 19B is an exhaust pipe at the end of the fixed inner cylinder 19A. The movable inner cylinder is fitted to be able to slide freely in the axial direction, and is fixed integrally with the movable outer cylinder 13B.

Reference numeral 21 denotes a combustion gas inlet formed at the outer end of the fixed inner cylinder 19A, which communicates with the exhaust port of the heating device.

22 is 180° to each other inside the outer cylinder of one divided body.
A plurality of locking protrusions (two in this embodiment) are provided at two locations forming a shape that does not easily deform elastically and are used to prevent removal. One end is fixed to the inner wall of the end portion, and the other end is bent so as to extend outward, protrude inwardly from the fixed outer cylinder 13A, and tilt backward.

Reference numeral 23 designates a locking projection on the outside of the inner cylinder of the other divided body that is capable of engaging with the locking projection 22 in the axial direction and has a shape that does not easily deform elastically, and corresponds to the locking projection 22. There are two in total, and in the embodiment, they are formed on the outer periphery of the inner end of the movable inner cylinder 19B.

Then, the combustion gas discharged from the heating device is guided into the exhaust stack 19 through the combustion gas port 21 and is discharged to the outside from the exhaust hole 16 of the supply cylinder 13.

On the other hand, external air is sucked into the air supply passage between the supply cylinder 13 and the exhaust pipe 19 through the air supply hole 15, and is supplied from the air supply pipe 18 to the air supply port of the heating device.

In the above configuration, when the fixed inner/outer cylinders 19A, 13A and the movable inner/outer cylinders 19B, 13B are fitted and assembled, they are fixed with the locking protrusions 22 and 23 in contact with each other. Inner/outer cylinders 19A, 13A and movable inner/outer cylinders 19B, 13
When B is strongly pressed against the other side, a force is applied to the locking projection 22 from the inside by the locking projection 23, and furthermore, this force is applied to the fixed outer cylinder, which is easy to deform, due to the locking projection 22, which is difficult to deform. 13A and the movable outer cylinder 13B as a concentrated force of two-point support, the fixed outer cylinder 13A and the movable outer cylinder 13
B is elastically deformed into an elliptical shape as shown in FIG. 3B.

Therefore, as shown in FIG. 3A, the locking protrusion 22 can fit the locking protrusion 23, and the second
(as shown by the two-dot chain line in FIG. 3A), where the fixed outer cylinder 13
A returns to its original shape.

In such a state, the movable inner and outer cylinders 19B and 13B
When the movable inner/outer cylinder 19B is moved in the extending direction, the locking protrusion 23 is locked with the locking protrusion 22.

The movement of 13B is regulated, and the removal is prevented.

In the above configuration, the locking convex portion 22 includes the movable inner/outer cylinders 19B, 13B and the fixed inner/outer cylinder 19A.

When assembling with 13A, as a result of having a shape that does not require elastic deformation of itself as in the conventional case, deformation is unlikely to occur even if the engagement state with the mating protrusion 22 is performed several times. Further, even if there is some dimensional variation during manufacturing, the removal prevention effect will not be affected.

In addition, as shown in FIG. 4, the movable inner/outer cylinder 19B.

The present invention can be similarly applied even if the tube 13B is configured to be fitted inside the fixed inner/outer tubes 13A and 19A.

In this case, the protrusion 22' is attached to the movable outer cylinder 13B, and the protrusion 23'
are provided on the fixed inner cylinder 19A, respectively, and the convex parts 22' and 23' are engaged with the movable inner and outer cylinders 19B.
, Make sure to stop the removal of 13B.

As explained above, this invention makes it possible to maintain stable removal prevention performance over a long period of time by simply improving the shape of the locking protrusion on the outer cylinder side, making it highly durable and economical as an air supply and exhaust pipe. It is also advantageous.

[Brief explanation of drawings]

Fig. 1 is a diagram explaining the structure of a conventional supply and exhaust pipe, Fig. 2 is a longitudinal sectional view explaining the structure of the supply and exhaust pipe according to the present invention, and Fig. 3 is a diagram illustrating the structure of a conventional supply and exhaust pipe.
The figure is a diagram illustrating the mutually overlapping state of the air supply and exhaust pipe segments, and A
B is a longitudinal cross-sectional view, B is a cross-sectional view, and FIG. 4 is a vertical cross-sectional view showing another embodiment of the present invention. 12... Supply and exhaust cylinder, 13... Supply cylinder, 1
3A...Fixed outer cylinder, 13B...Movable outer cylinder, 19...Exhaust pipe, 19A...Fixed inner cylinder, 19B... Movable inner cylinder, 22, 22',
23, 23'... Locking convex portion.

Claims (1)

[Scope of utility model registration request] The inner and outer double cylinder structure of the interconnected supply cylinder and exhaust cylinder is divided into two parts at the axial middle part, and the outer cylinders and inner cylinders of the two divided bodies are overlapped so that they can slide freely in the axial direction. In the supply/exhaust pipe of a supply/exhaust type combustion device configured so that the entire length can be freely expanded and contracted, a plurality of locking convex portions having a shape that does not easily deform elastically are provided on the inside of the outer cylinder of one split body, and the other A locking convex portion having a shape that can be engaged with the locking convex portion in the axial direction and is not easily deformed elastically is provided on the outside of the inner cylinder of the divided body, and a locking convex portion is provided when the divided bodies overlap each other. The outer cylinder is elastically expanded in the direction perpendicular to the axis, and the locking protrusions fit into the corresponding locking protrusions of the inner cylinder, and when the supply/exhaust pipe is extended, the two locking protrusions come into contact and extend the entire length. A supply/exhaust stack of a supply/exhaust type combustion device characterized by being configured to regulate.