JPS6141822A - Terminal device for balanced flue - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a terminal unit for a balanced flue.

The terminal equipment is usually mounted in a suitable opening in the exterior wall of the building. Known types of terminal devices are typically complex and expensive to assemble, as they include a large number of buffets and/or other components. For this reason, the known ones extend from the external surface of the wall to an undesirable extent, in some cases 10
It has a large structure that protrudes by ~15 cm. This protrusion gives it an unsightly appearance. Additionally, the presence of the panfur and/or other components may in such cases provide undue resistance to the combustion products exiting the terminal.

An object of the present invention is to provide a terminal device having a structure in which the above-mentioned problems are at least alleviated.

Therefore, even if the air flow is provided with a suction duct and a discharge duct in a direction across and/or towards the device, the combustion products can flow through said discharge duct substantially unhindered. Only the amount discharged from the duct,
an end portion of the discharge duct protrudes from the mouth of the suction duct, and means for substantially preventing combustion products discharged from the discharge duct from entering the suction duct are provided on the protrusion. A terminal device is provided for a balanced flue disposed around at least a portion of the end portion.

The suction duct and the discharge duct may be arranged concentrically or in a side-by-side (side-by-side) relationship.

The apparatus of the present invention may be configured such that there is substantially no buffing and/or other components at the mouth of the discharge duct that act to prevent the flow of combustion products outwardly therefrom. The device of the present invention can be used in condensing or non-condensing heat exchangers. The reduced resistance to the flow of combustion products in the direction away from the device is especially beneficial in the case of non-condensing heat exchange devices.

This is because the height of the combustion chamber used in such a system does not need to be very large when conventional equipment is used.

The inventors have discovered that with the device of the invention, fumes can be discharged substantially unhindered from the discharge duct while maintaining a satisfactory air flow into the device through the suction duct. Admitted. Furthermore, compared to previously known configurations, the device of the present invention can be configured to present a neat and unobtrusive appearance.

In a particular embodiment of the invention, the degree of protrusion of the discharge duct from the mouth of the suction duct may be in the range of 20 to 50M.

The above-mentioned means for preventing combustion products discharged from the discharge duct from entering the suction duct may consist of a plate which generally surrounds the protruding end portion of the discharge duct. At the mouth of the duct, the plate encloses a generally oval-shaped area or - a tactilely circular area. Other plate shapes may also be used.

For example, when a suction duct and a discharge duct are arranged in a juxtaposed relationship, the above provision only needs to be provided in the immediate vicinity of the suction duct, and there is no need to completely surround the protruding part of the discharge duct. .

Next, embodiments of the present invention will be described with reference to the drawings.

The terminal device described below is adapted to be mounted in a suitable opening in the exterior wall of a building.

Referring first to FIGS. 1 to 4, the device of the present invention is equipped with an air suction duct 10.
0 surrounds a discharge duct 20 which is generally coplanar with the wall and is generally circular in cross-section. @
The duct has a box-like structure defined by side members (not shown) lining the sides of the wall opening. A certain distance of 11 di from the plane of the outer wall surface (in this example, about 2
A protective grill 11 is installed at the location (0).

This grill generally serves to enhance the appearance of the device.

As best seen in FIG. 1, the discharge duct 20 projects from the mouth of the suction duct 10. This protrusion has been found to be advantageous because it allows the combustion products to exit the duct relatively unimpeded even when airflow is present in the vicinity of the device.

The inventors have discovered that when the airflow traverses the device substantially parallel to the wall surface, an area of relatively low pressure is created at the mouth of the discharge duct, thereby facilitating the evacuation of combustion products. Ru. Additionally, if the airflow is perpendicular to the wall, since the mouth of the discharge duct is remote from the area of relatively high pressure that forms near the wall when the airflow typically flows toward the device. Even so, the combustion products exit the discharge duct relatively unhindered.

In some cases, especially when the air flow is parallel to the wall, the protrusion described above can lead to excessive air intake and thus reduce the performance of the equipment to which this device is connected. It turns out. In order to reduce the possibility of this occurring, it is advisable to carefully select the dimensions of the above-mentioned protrusions, especially in the case of a device with an overall width of 290 m and a discharge duct diameter of 135 m. It is advantageous to have about 200 mm protruding from the mouth of the duct.
It has been found that satisfactory results can be obtained even when protruding up to 50 thighs. It will be appreciated that the dimensions mentioned above are not limiting on the invention, as the overall dimensions of the protrusions will depend to some extent on the overall dimensions of the device itself.

The family of curves shown in Figure 5 qualitatively shows how the variation of the air flow through the installation with respect to the wind speed (perpendicular to the wall) depends on the dimensions of the protrusion used. Shown from a perspective. Generally, the larger the protrusion, the greater the air flow. The dimensions of the protrusion can be set to values that provide a satisfactory air flow both at high and low wind speeds. Airflow should generally attain at least a minimum value at critical low wind speeds. The higher the exit velocity of the combustion products from the discharge duct, the higher the selected critical velocity (
There is a tendency to

Under certain operating conditions, the R discharged from the discharge duct
R, may re-enter the device through the suction duct. To eliminate this problem, the discharge duct is provided with a temporary plate 30 surrounding it. Separate the discharge and suction ducts only to the extent that they do not cause significant contamination.

The inventors have found that the above-described arrangement is particularly advantageous because the benefits of a prominent discharge duct are obtained while maintaining a relatively pure air inlet to the device.

As shown in the cross-sectional view of FIG. 3 and the side view of FIG. 4, the plate is generally flared to form a skirt surrounding the protruding portion of the discharge duct. Developing shape. According to European standard E26,
In the vicinity of the mouth of the suction duct, said plate generally has an elliptical cross-section, the long axis of which according to the invention The terminal device is oriented to extend substantially horizontally when properly mounted on a wall.

It will be appreciated that other shapes of the plate may be used. For example, as shown in FIGS. 6 and 7, [60 is adjacent to the mouth of the suction duct. Furthermore, although in the embodiments described above the suction and discharge ducts were arranged concentrically, this does not necessarily have to be the case; juxtaposition (side pipes,
side) may be arranged in a relationship; in these cases,
The plate does not necessarily need to completely surround the protruding part of the discharge duct.

As shown in the cross-sectional view of FIG.
It is formed integrally with 0. The remainder of the discharge duct, indicated generally at 41, fits closely into said member 40 and is centrally located with respect to the suction duct. The plate 30 itself has a grille 11 that is crimped onto the inner surface of the circumference &&32 of the plate.
It is positioned and secured within the device by upper upstanding legs (not shown). This type of mounting structure is advantageous because it does not require vanes or "spiders." It has been found that structures that penetrate into the area of the air intake duct in this manner tend to obstruct the flow of air into that duct and thus reduce the overall performance of the terminal device. For these reasons, it has been found advantageous to place the grill 11 inside the mouth of the duct.

The duct and the temporary may be separate parts suitably connected at the inner edge of the plate.

In yet another arrangement, as shown in FIGS. 6 and 7, the plate is mounted on a suitably shaped wire mesh 1 which also acts as a grill for both the suction duct and the discharge tally. Supported by

The terminal device according to the invention benefits from the provision of a protruding discharge duct while maintaining a satisfactory flow of substantially contaminant-free air in the suction duct. Furthermore, combustion products tend to be exhausted in a direction substantially perpendicular to the walls. The heating effect of the combustion products on the wall surface is therefore considerably reduced compared to a device in which the combustion products are discharged in a direction parallel to the wall.

This is particularly advantageous in the case of buildings constructed or covered with wood.

Moreover, in comparison with previously known arrangements, the device according to the invention can develop a neat and unobtrusive appearance, and in the embodiment described above the device can be installed only a few times (approximately 2 ) only protrude by a centimeter.

[Brief explanation of drawings]

Figure 1 is an external perspective view of a terminal device attached to the wall of a building;
FIG. 2 is a plan view of the terminal device, FIGS. 3 and 4 are a sectional view of the board taken along line AA in FIG. 2, and a side view of the board taken in the direction of arrow B, and FIG. Curve diagrams useful for understanding the operation of the above terminal device, Figures 6 and 7
The figures are a plan view of the terminal VT position of other models and a sixth
FIG. 3 is a cross-sectional view of the plate taken along line xX in the figure. In the drawing, 10 is a suction duct, 11 is a grill, and 20
30 is a discharge duct, 30 is a plate, 40 is a re-entrant member, 60 is a plate, and 61 is a wire mesh. Patent Applicant Saw 7 EMIA Brians Limited

Claims (1)

[Claims] 1. A suction duct and a discharge duct are provided so that combustion products are substantially inhibited even when airflow flows across the device and/or in a direction toward the device. An end portion of the discharge duct protrudes from the mouth of the suction duct to such an extent that it can be discharged from the discharge duct without causing any damage, and a portion of the discharge duct extends from the discharge duct around at least a portion of the protruding end portion. Terminal device for a balanced flue, characterized in that means are provided for preventing discharged combustion products from entering the suction duct. 2. The terminal device according to claim 1, wherein the preventing means comprises a plate disposed around the discharge duct. 3. The terminal device according to claim 2, wherein the plate has a generally flared shape. 4. The terminal device according to claim 2 or 3, wherein the plate surrounds an oval region adjacent to the mouth of the suction duct. 5. The terminal device according to claim 2 or 3, wherein the plate surrounds a circular area adjacent to the mouth of the suction duct. 6. The terminal device according to claim 2, wherein the end portion of the discharge duct is integrally formed with the plate. 7. The terminal device according to claim 1, wherein the suction duct and the discharge duct are provided with a grill.