CN2359383Y

CN2359383Y - Funnel cap for air-out

Info

Publication number: CN2359383Y
Application number: CN 99207544
Authority: CN
Inventors: 袁东立
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-03-31
Filing date: 1999-03-31
Publication date: 2000-01-19
Anticipated expiration: 2009-03-31

Abstract

The utility model relates to a funnel cap for air exhaust in dwelling house building. In order to overcome the deficiency that the existing air exhaust passage has hindered air exhaust, which is easy to create the air blowby phenomenon. The utility model is provided with a funnel cap with an arc shape on an outlet of the air exhaust passage. The funnel cap with an arc shape comprises a top cover presenting an upper arc shape, and an upper curved surface and a lower curved surface which are connected in sequence below the top cover and are correspondingly arranged on an arc-shaped cambered surface; the two curved surfaces are supported by a supporting rod, wherein, the middle part of the lower curved surface is provided with a through hole which is communicated with a vertical well of which the shape and the size are corresponding to that of the outlet of the air exhaust passage. When the horizontally flowing air flows between the two curved surfaces, the flow speed is accelerated along with that a flow passage becomes narrow, and hereby, the negative pressure is formed at the outlet position of the vertical well, which is favorable to the air exhaust.

Description

A kind of exhaust blast cap

The utility model belongs to the building implements field, relates in particular to the blast cap that is used for housing construction exhaust system exhaust duct.

Usually in the exhaust duct exit of building top layer, be equipped with brick mix structure top cover into usefulness such as screening rain.Be unfavorable for exhaust often causing exhaust not smooth owing to the steam vent around it is less.Especially when the exhaust fan of multilayer resident family started operation simultaneously, the windage of exhaust duct master vertical shaft was bigger, very easily causes collaborating mutually between each layer.If roof ventilator is set on the roof, existing noise pollution, and cost is too high, and the operational management difficulty also is not suitable for China's actual conditions.

In order to address the above problem, the purpose of this utility model just provides a kind of making and forms negative pressure in the exhaust duct vertical shaft, is easy to the exhaust blast cap that exhaust is used.

The purpose of this utility model is to realize like this.This exhaust blast cap comprises pole and a top cover.Described top cover is presented arched surface; Under this top cover, be provided with the relative upper and lower curved surface of arch cambered surface successively, and between two curved surfaces, support by pole; The through hole identical at least with the geomery at exhaust road junction is located at the middle part of lower surface camber, is connected with this through hole and have with the corresponding vertical shaft of the geomery at exhaust road junction.

Above-mentioned curved surface is a surface of revolution, and is preferably sphere, and the span of its radius of curvature is at 500mm-5000mm.

Minimum range is 30mm-500mm between the corresponding cambered surface of top-surface camber and lower surface camber.

The arc length of top cover should be greater than the arc length of top-surface camber.

Effect of the present utility model is conspicuous.Because it is narrow to be provided with a centre that is made of upper and lower curved surface in the exhaust duct outlet, and the big air flow channel of periphery, when the wind of bottom horizontal flow sheet passes through between two curved surfaces, along with runner narrows down gradually, flow velocity is accelerated, thereby goes out the interruption-forming negative pressure at vertical shaft, and the air in the exhaust duct vertical shaft is taken out of.If the air themperature in the vertical shaft is higher than outside air temperature, hot air upwards flows under buoyancy function, also is beneficial to discharge when running into top-surface camber.

Accompanying drawing 1 is a cross-sectional view of the present utility model;

Accompanying drawing 2 is the cross-sectional view of the another embodiment of the utility model.

Below in conjunction with accompanying drawing the utility model is described further: this exhaust blast cap as shown in Figure 1, have a last arch top cover 3 that can be used for hiding rain, it can be that arc-shaped curved surface also can be other curve form; Also be provided with successively for 3 times at this top cover and have identical radian measure, and the arch cambered surface is between upper and lower curved surface 1,2, two curved surfaces that are oppositely arranged and is realized supporting by pole 4.No matter be angle from hydrodynamics or process for machining and manufacturing, above-mentioned curved surface with surface of revolution for well, and sphere better (this moment, the radius of curvature of sphere can be chosen in 500mm-5000mm); Minimum range between top-surface camber and the lower surface camber is 30mm-500mm, has constituted an air flow channel that the centre is narrow, periphery is big like this.The middle part of lower surface camber 2 offers and the identical or more bigger through hole of exhaust duct outlet geomery, and fixedly is communicated with vertical shaft 5 at this place.The shape and size of vertical shaft 5 are decided according to the concrete condition in different building exhausts road, and are demonstrated by Fig. 1 and Fig. 2, have the corresponding vertical shaft 5 of geomery with the exhaust duct outlet, can be set in the inboard or the outside of exhaust duct outlet according to different needs.In addition, the curved surface arc length that also has top cover 3 that can infer should be greater than the arc length of coupled top-surface camber 1.When using this exhaust blast cap, the wind of bottom horizontal flow sheet is accelerated because of the runner flow velocity that narrows down gradually when flowing through between upper and lower two curved surfaces, forms negative pressure in the vertical shaft exit, and the air in the vertical shaft is taken out of; If the air themperature in the vertical shaft is higher than outside air temperature, hot air upwards flows under buoyancy function, also is beneficial to discharge when running into top-surface camber 1.

Claims

1, a kind of exhaust blast cap comprises pole and a top cover, it is characterized in that described top cover (3) is presented arched surface; The upper and lower curved surface (1,2) that under this top cover, also has the arch cambered surface to be oppositely arranged successively, and between two curved surfaces, support by pole (4); The through hole identical at least with the geomery at exhaust road junction is located at the middle part of lower surface camber (2), is connected with this through hole and have with the corresponding vertical shaft of the geomery at exhaust road junction (5).

2, exhaust blast cap as claimed in claim 1 is characterized in that, above-mentioned curved surface is a surface of revolution.

3, exhaust blast cap as claimed in claim 1 or 2 is characterized in that, above-mentioned curved surface is preferably sphere, and the span of radius of curvature is at 500mm-5000mm.

4, exhaust blast cap as claimed in claim 1 is characterized in that, minimum range is 30mm-500mm between top-surface camber (1) and the corresponding cambered surface of down bent (2) face.

5, exhaust blast cap as claimed in claim 1 is characterized in that, the arc length of top cover (3) should be greater than the arc length of top-surface camber (1).