JPH0722244U - Air supply / exhaust top for closed combustion equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a supply / exhaust top for a hermetic combustion device capable of reliably preventing the short-path phenomenon even when a wind force from a direction facing the supply / exhaust top is applied. [Composition] An air supply passage 3 for taking in air from the outside to a closed combustion device 5 installed indoors, and a closed combustion device 5
The exhaust passage 7 for exhausting the exhaust gas from the outside is made into a double pipe structure with the exhaust passage 7 inside, and the supply port 4 of the supply passage 3 and the exhaust port 8 of the exhaust passage 7 are opened to the outside of the room. In the air supply / exhaust top, an exhaust side decorative plate 6 that defines the air supply port 4 and the air exhaust port 8 is expanded in a trumpet shape toward the tip direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a supply / exhaust top for air intake from the outside and exhaust gas discharge to the outside for hermetically sealed combustion installed in the room.

[0002]

[Prior art]

 Conventionally, as a supply / exhaust top for taking in air from the outside and discharging exhaust gas to the outside in a closed combustion device installed in the room, ones shown in FIGS. 3 and 4 are known. . The air supply / exhaust top is configured as a double pipe, and in the figure, 21 indicates an inner pipe and 22 indicates an outer pipe. An air supply passage 23 is formed between the inner pipe 21 and the outer pipe 22, and an air supply port 24 is opened at an end of the air supply passage 23. On the other hand, the other end of the air supply passage 23 is connected to the closed combustion device 26. Further, an air supply side decorative plate 25 is provided on the outer edge of the end portion of the outer tube 22 on the air supply port 24 side.

An exhaust passage 27 is formed in the inner pipe 22 as a passage for exhaust gas from the closed combustion device 26. An exhaust port 28 communicating with the exhaust passage 27 is opened at the end of the inner pipe 22.

Further, the air supply port 24 and the exhaust port 28 are defined by an exhaust side decorative plate 29 provided on the outer periphery of the inner pipe 21 and having a curved cross section.

In the above device, the outdoor air taken in from the air supply port 24 as indicated by the one-dot chain line arrow is sent to the closed combustion device 26 through the air supply passage 23 and burned. Be served. The exhaust gas generated by the combustion in the closed combustion device 26 passes through the exhaust passage 27 as shown by the solid line arrow and is discharged from the exhaust port 28.

[0006]

In such a device, since the air supply port 24 and the exhaust port 28 are defined by the exhaust side makeup plate 29, during normal operation, the exhaust passage A so-called short pass phenomenon in which the exhaust gas discharged from 28 goes around to the air supply port 24 side is prevented.

However, when the wind is received from the direction opposite to the air supply / exhaust top, that is, the direction shown by the white arrow in FIG. 4, the distance d from the air supply port 24 to the exhaust port 28 is short, so the short pass phenomenon occurs. May occur.

Further, when the exhaust side decorative plate 27 is formed in the shape of the above device, the directivity of the flow of the exhaust gas discharged from the exhaust port 28 as shown by the solid line arrow in FIG. Also, due to the influence of, there is a tendency for the flow (directivity) to curve toward the air supply port 24 side. Therefore, when the wind is received from the direction of the arrow, the short pass phenomenon is more likely to occur.

The present invention focuses on the above-mentioned problems, and even if the force of the wind from the direction facing the air supply / exhaust top acts, the exhaust gas goes around to the air supply port 24, a so-called short path phenomenon. The aim is to provide a supply / exhaust top for a closed combustion device that can reliably prevent the above.

[0010]

[Means for Solving the Problems]

 The air supply / exhaust top for a hermetically sealed combustion device according to the present invention has an air supply passage for introducing air from the outside to the hermetically sealed combustion device installed in a room, and an exhaust gas from the hermetically sealed combustion device for the outdoor The exhaust passage for exhausting to the inside has a double pipe structure with the exhaust passage inside, and the supply passage and the exhaust passage are opened to the outside of the room. The exhaust-side decorative plate that defines the exhaust passage from the air supply passage is expanded in a trumpet shape toward the front end direction.

[0011]

[Action]

 In the above device, the makeup plate on the exhaust side of the air supply / exhaust top is expanded in a trumpet shape toward the tip end. Is substantially extended. Therefore, even if the exhaust gas discharged from the exhaust port of the exhaust passage receives wind from the opposite direction, it is difficult for the exhaust gas to flow to the air supply port side.

Further, by expanding the exhaust-side decorative plate toward the tip end in a straight line in a trumpet shape, the exhaust gas discharged from the exhaust port has a curved flow to the air supply port as in the conventional case. There is no directivity of. Therefore, even if the wind force from the opposite direction acts, the exhaust gas does not easily enter the air supply port.

[0013]

【Example】

 Hereinafter, a preferred embodiment of the air supply / exhaust top for a closed combustion device of the present invention will be described with reference to the drawings. FIG. 1 or 2 shows an air supply / exhaust top for a closed combustion device according to an embodiment of the present invention. The air supply / exhaust top is composed of a double pipe. In the figure, 1 indicates an inner pipe and 2 indicates an outer pipe. An air supply passage 3 is formed between the inner pipe 1 and the outer pipe 2, and an air supply port 4 is opened at an end of the air supply passage 3. The other end of the air supply passage 3 is connected to the closed combustion device 5. Further, an air supply side decorative plate 6 is provided on the outer edge of the outer tube 2 on the air supply port 4 side.

The end portion of the inner pipe 2 is connected to the closed combustion device 5. Exhaust gas generated by combustion in the closed combustion device 5 passes through an exhaust passage 7 formed by an inner peripheral wall of the inner pipe 2, and is discharged from an exhaust port 8 opened at the other end of the inner pipe 2. Is configured.

The air supply port 4 and the exhaust port 8 are defined by an exhaust side decorative plate 9 provided on the outer circumference of the inner pipe 2. As shown in FIG. 2, the exhaust side decorative plate 9 is flared in the shape of a trumpet toward the front end direction, and its cross section is formed to extend substantially linearly.

In the above-mentioned device, the outdoor air taken in through the air supply port 4 is sent to the closed combustion device 5 through the air supply passage 3 as shown by the one-dot chain line arrow in FIG. , Burned. Exhaust gas generated by combustion in the closed combustion device 5 is discharged from the exhaust port 8 through the exhaust passage 7 as shown by a solid arrow.

As shown in FIG. 2, the air supply port 4 and the exhaust port 8 are defined by an exhaust-side decorative plate 9 that expands in a trumpet shape toward the tip end direction. Therefore, the distance d (FIG. 2) from the air supply port 4 to the air exhaust port 8 is substantially extended as compared with the conventional structure shown in FIG. The so-called short-pass phenomenon, in which the exhaust gas discharged from the exhaust port 8 flows into the air supply port 3 even when receiving wind from the direction indicated by the white arrow, is prevented.

Further, since the exhaust side decorative plate 9 which is expanded in a trumpet shape toward the tip direction is formed to have a substantially linear cross section, the flow of the exhaust gas discharged from the exhaust port 8 2 has a directivity indicated by a solid arrow in FIG. That is, it does not have the directivity of the curved flow toward the air supply port 4 side unlike the conventional device. Therefore, the exhaust gas does not easily go around to the air supply port 4 even if the force of the wind from the white arrow direction acts.

[0019]

[Effect of device]

 As described above, in the case of the air supply / exhaust top for the hermetic combustion device of the present invention, the air supply port and the air exhaust port are defined by the exhaust side decorative plate that expands like a trumpet. By increasing the distance to the exhaust port, it is possible to easily prevent exhaust gas from flowing into the intake port even if the force of wind acts from the opposite direction.

Further, if the exhaust side decorative plate, which is expanded in a trumpet shape toward the tip direction, is formed in a straight line in the cross-sectional shape, the exhaust gas discharged from the exhaust port has a conventional structure. It does not have a curved flow directivity to a clean exhaust port. Therefore, it is possible to more reliably prevent the short-pass phenomenon in which the exhaust gas goes around to the air supply port.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an air supply / exhaust top for a closed combustion device according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view around the exhaust side decorative plate portion of the apparatus of FIG.

FIG. 3 is a schematic configuration diagram of a conventional air supply / exhaust top for a closed combustion device.

4 is an enlarged cross-sectional view of an exhaust side decorative plate portion of the apparatus of FIG.

[Explanation of symbols]

 1 inner pipe 2 outer pipe 3 air supply passage 4 air supply port 5 closed combustion device 6 air supply side makeup plate 7 exhaust passage 8 exhaust port 9 exhaust side makeup plate

Claims (2)

[Scope of utility model registration request] 1. An air supply passage for taking in air from the outside to a closed combustion device installed indoors, an exhaust passage for discharging exhaust gas from the closed combustion device to the outside, and an exhaust passage inside In a supply / exhaust top for a closed combustion device, which has a double-pipe structure for opening the supply passage and the exhaust passage to the outside, the exhaust side defining the exhaust passage from the supply passage at the opening to the outside A supply / exhaust top for a hermetic combustion device, characterized in that the decorative plate is expanded in a trumpet shape toward the tip. 2. The air supply / exhaust top for a hermetic combustion apparatus according to claim 1, wherein the exhaust-side decorative plate that expands in a trumpet shape is formed to be substantially linear in cross section.