CN215948786U - Sand prevention device for roof ventilation shaft - Google Patents

Abstract

The utility model discloses a sand prevention device of a roof ventilation shaft. The device is provided with a sand-proof shutter (4) and a sand-proof cover (3), the inner cavity of the sand-proof cover (3) is divided into a static pressure chamber, an installation cavity and a communicating cavity (15), and the static pressure chamber is enclosed by the sand-proof cover (3) and a partition plate (13) arranged in the inner cavity of the sand-proof cover (3). An air filter (5) is arranged in the static pressure room, and the air filter (5) divides the static pressure room into an upper static pressure room (12) and a lower static pressure room (11). The top of the installation cavity is provided with a support piece (10). The top of the upper static pressure chamber (12) is communicated with the top of the mounting cavity through a communicating cavity (15), and the sand-proof shutter (4) is arranged on a sand-proof cover (3) on the side surface or the bottom surface of the lower static pressure chamber (11). The utility model is mainly used for buildings with roof ventilation shafts in control rooms, cabinets and the like in the industries of petrochemical engineering and the like.

Description

Sand prevention device for roof ventilation shaft

Technical Field

The utility model belongs to the technical field of building ventilation air conditioners, and relates to a sand prevention device for a roof ventilation shaft.

Background

The ventilation and air conditioning system of buildings is provided with a plurality of air inlets and air outlets which are communicated with the outside. To the building of setting in the petrochemical installation, in order to guarantee that the air of fresh air inlet department is comparatively clean, set up the ventilation shaft on the roof of building usually, introduce the fresh air from the roof high altitude. In addition, sometimes all the periphery of buildings located in petrochemical equipment faces equipment with fire hazard, according to the regulations of GB50160-2008 petrochemical enterprise design fire standards (2018 edition), the outer walls of buildings such as control rooms, cabinets and the like facing the side with fire hazard equipment are not provided with doors, windows and holes, air inlets and air outlets (collectively called air outlets) of the buildings, which lead to the outside, can only be arranged on a roof ventilation shaft, and the air outlets are provided with sand prevention devices which are usually sand prevention shutters. However, under outdoor sandstorm or sandstorm weather conditions, these sand-prevention shutters cannot block sand from entering the room with the wind. When a large amount of dust enters the room and enters the fresh air unit along the air duct, the middle-effect filter arranged in the fresh air unit can quickly reach the set final resistance value. And to setting up the new fan unit of chemical filter section between control room, rack etc. a large amount of sand and dust can lead to chemical filter section to block up through chemical filter section, need change the chemical filter material in advance to increase ventilation air conditioning system's maintenance cost by a wide margin.

In order to prevent the above situations, sand-proof shutters with improved structures appear; for example, chinese patent CN205243376U discloses a ventilating sand-proof louver and a louver comprising the same, and CN202401942U discloses a sand-proof louver. However, the sand control effect of these sand control blinds is still poor.

Disclosure of Invention

The utility model aims to provide a sand prevention device for a roof ventilation shaft, which aims to solve the problem of poor sand prevention effect of the existing sand prevention device.

In order to solve the problems, the utility model adopts the technical scheme that: the utility model provides a sand control device of roof ventilation shaft is equipped with sand control tripe which characterized in that: the sand prevention device of the roof ventilation shaft is further provided with a sand prevention cover, the inner cavity of the sand prevention cover is divided into a static pressure chamber, an installation cavity and a communicating cavity, the static pressure chamber is surrounded by the sand prevention cover and a partition plate arranged in the inner cavity of the sand prevention cover, an air filter is arranged in the static pressure chamber, the air filter divides the static pressure chamber into an upper static pressure chamber and a lower static pressure chamber, a supporting piece is arranged at the top of the installation cavity, the top of the upper static pressure chamber is communicated with the top of the installation cavity through the communicating cavity, and sand prevention shutters are arranged on the sand prevention cover on the side face or the bottom face of the lower static pressure chamber.

The utility model has the following beneficial effects: when the device is used, the mounting cavity is sleeved on the roof ventilation shaft, and when outdoor sand-containing air enters the roof ventilation shaft through the device, the sand-preventing shutter and the air filter can remove a part of sand and dust. In the lower static pressure room and the upper static pressure room, the sand-containing air flows upwards at a low speed and can separate sand and dust by means of gravity. Therefore, the sand removing effect of the utility model is better, the sand prevention performance can be greatly improved, and the sand and dust can be prevented from entering the room through the roof ventilation shaft.

The utility model is mainly used for buildings with roof ventilation shafts in control rooms, cabinets and the like in the industries of petrochemical engineering and the like. The roof ventilation shaft is used for supplying air to the interior or exhausting air from the interior to the exterior; when the air conditioner is used for blowing air from indoor to outdoor, the air conditioner can prevent sand when outdoor sand-containing air flows backwards to indoor.

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. The drawings and detailed description do not limit the scope of the utility model as claimed.

Drawings

Fig. 1 is a schematic perspective view of a sand control device for a roof ventilation shaft according to a first embodiment of the present invention, and fig. 1 also shows the roof ventilation shaft and the roof of a building.

Fig. 2 is a cross-sectional view of fig. 1 taken along a vertical plane perpendicular to a positive side of the static pressure chamber as a cross-sectional plane and on a projection plane parallel to the cross-sectional plane.

Fig. 3 is a perspective view showing a sand control device for a roof ventilation shaft according to a second embodiment of the present invention, and fig. 3 also shows the roof ventilation shaft and the roof of a building.

Fig. 4 is a cross-sectional view of fig. 3 taken along a vertical plane perpendicular to the front side of the static pressure chamber as a cross-sectional plane and on a projection plane parallel to the cross-sectional plane.

In fig. 1 to 4, the same reference numerals denote the same technical features. The reference numerals denote: 1-roof; 2-a roof ventilation shaft; 3-a sand screen; 4, sand prevention shutter; 5-an air filter; 6, pressing strips of the flexible sealing gaskets; 7-a flexible gasket; 8-a sliding guide rail; 9-a handle; 10-a support member; 11-lower static pressure chamber; 12-upper static pressure chamber; 13-a separator; 14-a fixing member; 15-communicating chamber; 16-access door.

Detailed Description

Referring to fig. 1 and 2, the sand control device (simply referred to as device) of the roof ventilation shaft of the utility model is provided with sand control shutters 4 and a sand control cover 3, and the inner cavity of the sand control cover 3 is divided into a static pressure chamber, an installation cavity and a communication cavity 15. The static pressure chamber is enclosed by the sand-proof cover 3 and a clapboard 13 arranged in the inner cavity of the sand-proof cover 3; an air filter 5 is arranged in the static pressure room, the air filter 5 is generally horizontally arranged, the static pressure room is divided into an upper static pressure room 12 and a lower static pressure room 11, and the height H of the upper static pressure room 12 and the height H of the lower static pressure room 11 are both 600-1000 mm generally. The installation cavity is enclosed by the sand screen 3 and the partition plate 13, and the installation cavity and the static pressure chamber are respectively positioned at two sides of the partition plate 13. When the device is used, the installation cavity is sleeved on the roof ventilation vertical shaft 2 on the roof 1. The top of the installation cavity is provided with a support member 10 (e.g. a support plate) supported on the top of the roof ventilation shaft 2, and the side of the installation cavity is fixed to the side of the roof ventilation shaft 2 by a fixing member 14 (e.g. an expansion bolt, etc.). The bottom of the supporting piece 10 is adhered with a flexible sealing gasket batten 6, and the flexible sealing gasket batten 6 is tightly pressed between the bottom of the supporting piece 10 and the top of the roof ventilation shaft 2. The top of the upper static pressure chamber 12 is communicated with the top of the mounting cavity through a communication cavity 15. In fig. 2 and 4, a two-dot chain line indicates a boundary line between the upper static pressure chamber 12 and the communication chamber 15. The sand-proof shutter 4 is arranged on the sand-proof cover 3 on the side surface or the bottom surface of the lower static pressure chamber 11, and the sand-proof shutter 4 is positioned below the air filter 5.

The cross-sectional shapes of the static pressure chambers (including the upper static pressure chamber 12 and the lower static pressure chamber 11), the installation cavity and the communication cavity 15 are generally rectangular. Referring to fig. 1 and 2, the sand-proof louver 4 is arranged on the sand-proof cover 3 on the front side surface of the lower static pressure chamber 11, and the bottom of the sand-proof louver 4 is flush with the bottom of the front side surface. An access door 16 is arranged on the sand-proof cover 3 at the side surface of the lower static pressure chamber 11, and the access door 16 is communicated with the lower static pressure chamber 11. The access door 16 is closed at ordinary times, and after being opened, the dust and sand in the lower static pressure chamber 11 can be cleaned by people. The side of the static pressure chamber 11 facing the lower static pressure chamber is the side facing the partition 13. The side surfaces of the static pressure chamber and the lower static pressure chamber 11 are side surfaces adjacent to both sides of the front side surface. When the sand-proof louver 4 is provided on the sand-proof cover 3 on the bottom surface of the lower static pressure chamber 11, the access door 16 is not provided, and the sand dust separated in the lower static pressure chamber 11 leaks downward from the sand-proof louver 4.

The air filter 5 may be fixed in the static pressure compartment. In a preferred embodiment of the present invention, the inner surfaces of the sand screens 3 on both side surfaces of the static pressure chamber are respectively provided with a sliding guide 8, and both sides of the air filter 5 can slide along the sliding guide 8. The outer end face of the air filter 5 is provided with a handle 9, the handle 9 is pushed and pulled, and the air filter 5 can be inserted into the static pressure chamber from the opening on the sand-proof cover 3 on the front side face of the static pressure chamber or the air filter 5 can be pulled out from the static pressure chamber. After the air filter 5 is extracted, it can be replaced or cleaned. The inner end face of the air filter 5 is adhered with a flexible sealing gasket 7, and when the air filter 5 is inserted into a static pressure chamber and touches the partition plate 13, the flexible sealing gasket 7 is clamped between the inner end face of the air filter 5 and the partition plate 13. The inner end surface of the air filter 5 is an end surface adjacent to the partition 13, and the end surface opposite to the inner end surface is an outer end surface of the air filter 5. The appropriate air filter 5 can be selected according to outdoor weather conditions, wind and sand weather frequency and the use function of the building. The filtration level of the air filter 5 may be a primary filter or a secondary filter. The air filter 5 may be disposable or may be disposable.

Fig. 1 and 2 show a first embodiment of the device according to the utility model, provided with a set of sand protection shutters 4, a partition 13, an air filter 5, an upper static pressure compartment 12, a lower static pressure compartment 11 and an access door 16. The second embodiment of the device of the utility model is that two sides of the installation cavity are respectively provided with a group of sand-proof shutters 4, a partition plate 13, an air filter 5, an upper static pressure room 12, a lower static pressure room 11 and an access door 16 in a symmetrical mode; the tops of the two upper static pressure chambers 12 are communicated with the top of a mounting cavity through a communicating cavity 15, and the mounting cavity is enclosed by the sand screen 3 and the two partition plates 13, which is shown in fig. 3 and 4. The second embodiment can be adopted when the amount of air flowing through the sand control device of the roof ventilation shaft is large.

When the device is used, outdoor sand-containing air enters the lower static pressure chamber 11 through the sand-proof shutter 4, and the sand-proof shutter 4 blocks part of sand dust. The sand-containing air entering the lower static pressure room 11 flows upwards, a part of sand and dust is separated by gravity in the flowing process, and the separated sand and dust falls to the lower part of the lower static pressure room 11. The air then flows upwardly through the air filter 5 to remove sand and then upwardly into the upper static pressure compartment 12. The sand-containing air entering the upper static pressure room 12 flows upwards, the remaining sand and dust are separated by gravity in the flowing process, and the separated sand and dust fall onto the air filter 5. The air from which the dust is separated in the upper static pressure compartment 12 finally flows into the roof ventilation shaft 2 via the connecting chamber 15. In fig. 1 to 4, hollow arrows without reference numerals indicate the flow direction of air.

In the above process, the surface wind speed of the air flowing through the sand-preventing shutter 4 is generally not more than 2 m/s, and the cross-sectional wind speed of the air in the lower static pressure room 11 and the upper static pressure room 12 is generally not more than 1.5 m/s.

Claims (5)

1. The utility model provides a sand control device of roof ventilation shaft is equipped with sand control tripe (4), its characterized in that: the sand prevention device of the roof ventilation shaft is further provided with a sand prevention cover (3), the inner cavity of the sand prevention cover (3) is divided into static pressure chambers, an installation cavity and a communicating cavity (15), the static pressure chambers are surrounded by the sand prevention cover (3) and a partition plate (13) arranged in the inner cavity of the sand prevention cover (3), an air filter (5) is arranged in each static pressure chamber, the air filter (5) divides the static pressure chambers into an upper static pressure chamber (12) and a lower static pressure chamber (11), a supporting piece (10) is arranged at the top of the installation cavity, the top of the upper static pressure chamber (12) is communicated with the top of the installation cavity through the communicating cavity (15), and the sand prevention shutter (4) is arranged on the sand prevention cover (3) on the side face or the bottom face of the lower static pressure chamber (11).

2. A sand control device for a roof ventilation shaft according to claim 1, wherein: the cross section of the lower static pressure chamber (11) is rectangular, the sand-proof shutter (4) is arranged on the sand-proof cover (3) on the front side surface of the lower static pressure chamber (11), and the sand-proof cover (3) on the side surface beside the lower static pressure chamber (11) is provided with an access door (16).

3. A sand control device for a roof ventilation shaft according to claim 2, wherein: the inner surfaces of the sand shields (3) on two side surfaces of the static pressure chamber are respectively provided with a sliding guide rail (8), and two sides of the air filter (5) can slide along the sliding guide rails (8).

4. A sand control device for a roof ventilation shaft according to claim 3, wherein: the height of the upper static pressure chamber (12) and the height of the lower static pressure chamber (11) are both 600-1000 mm.

5. A sand control device for a roof ventilation shaft according to claim 1, 2 or 3, wherein: two sides of the installation cavity are respectively provided with a group of sand-proof shutters (4), a partition plate (13), an air filter (5), an upper static pressure chamber (12) and a lower static pressure chamber (11) in a symmetrical mode.

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