CN214403650U

CN214403650U - Anti-backflow air shaft

Info

Publication number: CN214403650U
Application number: CN202022633325.7U
Authority: CN
Inventors: 范良凯; 施慧; 徐才奎
Original assignee: Nanjing Junli Tech Co ltd
Current assignee: Nanjing Junli Tech Co ltd
Priority date: 2020-11-16
Filing date: 2020-11-16
Publication date: 2021-10-15
Anticipated expiration: 2030-11-16

Abstract

The utility model discloses a prevent flowing backward ventilating shaft effectively prevents that ground rivers from flowing backward, ensures secret space safety. The utility model discloses a prevent flowing backward air shaft, including outstanding well enclosure (1) in ground, and the vent (11) of well enclosure (1) top or side, still include the suit in the well enclosure (1) outside, can follow the liftable enclosure (2) that well enclosure (1) reciprocated; when no water is accumulated around the shaft enclosure wall (1), the liftable enclosure (2) is positioned at the bottommost part and does not block the ventilation of the ventilation opening (11); when ponding has all around well enclosure (1), liftable enclose fender (2) and move up along well enclosure (1), prevent that ponding from flowing backward entering air shaft from vent (11). The liftable enclose and keep off (2) and be equipped with sealing member (3) between well enclosure (1), prevent that ponding from the liftable enclose the gap leakage between fender (2) and well enclosure (1).

Description

Anti-backflow air shaft

Technical Field

The utility model belongs to the technical field of the underground construction auxiliary facilities, especially a prevent flowing backward ventilating shaft.

Background

In order to realize ventilation between underground buildings and the ground, underground spaces such as tunnels, underground passages, basements, and air dams are generally provided with ventilation shafts, referred to as air shafts, for short, for communicating the underground spaces with the ground. The air shaft can also be used for escape and fire fighting. Including natural ventilation shafts and mechanically assisted ventilation shafts.

The wind shaft typically includes a subterranean portion buried below the ground and a shaft enclosure extending above the ground. And a ventilation window communicated with the air is arranged at the top of the shaft enclosure wall. The ventilation window can be a horizontal opening at the top end of the well enclosure wall, and can also be vertical windows arranged around the top of the well enclosure wall, and the top of each vertical window is provided with a horizontal or inclined shielding object. The shaft enclosure that the air shaft stretches out on the ground can prevent a small amount of water on the ground lower than the height of the shaft enclosure from entering the ventilation well.

Due to environmental restrictions, especially in cities, the shaft enclosure height cannot be too high. When a large amount of water is accumulated on the ground suddenly and the accumulated water depth exceeds the height of the well enclosure, the situation that the water accumulated on the ground flows backwards along the air shaft and enters the underground space can occur. And the structure of the existing air shaft can not prevent the backflow of high-level water flow.

Disclosure of Invention

An object of the utility model is to provide a prevent flowing backward ventilating shaft effectively prevents that ground rivers from flowing backward, ensures secret space safety.

Realize the utility model discloses the technical solution of purpose does:

a backflow-preventing air shaft comprises a shaft enclosing wall protruding out of the ground, a ventilation opening at the top or the side of the shaft enclosing wall, and a lifting enclosing barrier which is sleeved outside the shaft enclosing wall and can move up and down along the shaft enclosing wall;

when no water is accumulated around the well enclosure wall, the liftable enclosure is positioned at the bottommost part and does not block the ventilation opening for ventilation; when ponding has all around the well enclosure, liftable enclose the fender and move up along the well enclosure, prevent that ponding from flowing backward and getting into the air shaft from the vent.

The liftable enclose and be equipped with sealing member between keeping off and the well enclosure, prevent that ponding from the liftable enclose the gap leakage between fender and the well enclosure.

Compared with the prior art, the utility model, it is showing the advantage and is:

1. effectively prevent ground rivers from flowing backward: the high well enclosure height that is close to of manger plate and liftable enclose the sum of keeping off the height, and the top can be close to twice well enclosure height, has improved the manger plate ability greatly, prevents effectively that ground rivers from flowing backward, ensures secret space safety.

2. The method is simple and reliable: the air shaft can prevent the backflow without electric power, and has low cost and good reliability.

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Drawings

Fig. 1 is the utility model discloses prevent flowing backward air shaft spatial structure schematic diagram of anhydrous state at ordinary times, well enclosure top is the level uncovered.

Fig. 2 is a sectional view of fig. 1.

Fig. 3 is the utility model discloses prevent flowing backward the waterproof operating condition's of air shaft spatial structure sketch map, waterproof fender that encloses is in the in-process that rises in the picture.

Fig. 4 is a sectional view of fig. 3.

Fig. 5 is the utility model discloses prevent flowing backward the waterproof operating condition's of air shaft spatial structure sketch map, waterproof fender that encloses has risen to the highest position in the picture.

Fig. 6 is a cross-sectional view of fig. 5.

Fig. 7 is a schematic structural view of the shaft wall in fig. 1.

Fig. 8 is a schematic structural view of the waterproof enclosure of fig. 1.

Fig. 9 is a schematic perspective view of another embodiment of the downdraft prevention air shaft of the present invention, wherein vertical ventilation openings are formed around the sidewall of the top of the well enclosure.

Fig. 10 is a schematic perspective view of a waterproof working state of the backflow-preventing air shaft with a limiting block.

In the figure, a shaft enclosing wall 1, an air vent 11, a lifting enclosing baffle 2, a cylinder 21, a buoyancy block 22, a sealing component 3, a sealing block 31, a lifting mechanism 4, a balancing weight 41, a pulley 42, a pull rope 43, an upper limiting block 51 and a lower limiting block 52.

Detailed Description

As shown in fig. 1 to 6, the utility model discloses prevent flowing backward ventilating shaft, including outstanding well enclosure 1 in ground, as shown in fig. 7, and the vent 11 of 1 top of well enclosure or side, still include the suit at 1 outside of well enclosure, can follow the liftable that well enclosure 1 reciprocated and enclose fender 2, as shown in fig. 8.

When no water is accumulated around the shaft enclosure wall 1, the liftable enclosure 2 is positioned at the bottommost part and does not block the ventilation of the ventilation opening 11; when the liftable enclosure 2 is positioned at the bottommost part, a certain gap is formed between the bottom end of the liftable enclosure 2 and the ground, so that accumulated water enters to generate buoyancy; when there is ponding around well enclosure 1, liftable enclose fender 2 and move up along well enclosure 1, prevent that ponding from flowing backward and getting into the air shaft from vent 11.

But the liftable encloses to be equipped with sealing member 3 between fender 2 and well enclosure 1, prevents that ponding from the gap leakage dew between liftable enclose fender 2 and well enclosure 1.

The sum of the weight of the liftable enclosure 2 and the friction force of the liftable enclosure 2 moving upwards along the well enclosure 1 is less than the weight of the liftable enclosure 2 discharging water.

The working principle is as follows: the liftable enclose fender 2 whole density is less than water, and the water buoyancy that corresponds is greater than and encloses fender weight and rising frictional force sum, meets water and rises, and sealing component 3 is sealed, prevents that the liftable from enclosing to keep off 2 and reciprocates the in-process liftable along well enclosure 1 and encloses and keep off 2 lower part and well enclosure 1 well upper portion between sealed leaking.

The liftable enclose fender 2 includes barrel 21, still include with barrel 21 lower part fixed connection's a plurality of buoyancy piece 22, the liftable encloses the weight of keeping off 2 and buoyancy piece 22 and the liftable encloses fender 2 and is less than the liftable and enclose the weight that keeps off 2 and buoyancy piece 22 row boiled water along the lift of 1 upwards removal frictional force of well enclosure.

The working principle is as follows: the liftable enclose fender 2 and buoyancy piece 22's bulk density is less than water, and corresponds water buoyancy > the liftable enclose keep off 2 weight and buoyancy piece 22 weight and rise the frictional force sum, meets water and rises, and sealing member 3 is sealed, prevents that the liftable from enclosing to keep off 2 and reciprocates the in-process liftable along well enclosure 1 and encloses to keep off 2 lower parts and well enclosure 1 well upper portion between sealed leaking.

As shown in fig. 2, 4 and 6, the sealing member 3 includes a sealing block 31 having one end sealingly and fixedly connected to the periphery of the lower portion of the cylinder 21 and the other end sealingly and fixedly connected to the periphery of the upper portion of the hoistway wall 1.

The sealing block 31 keeps the lower part of the liftable enclosure 2 and the middle upper part of the well enclosure 1 sealed and watertight in the process that the liftable enclosure 2 moves up and down along the well enclosure 1.

The sealing block 31 is one of rubber, silica gel and plastic, and is fixed on the lower part of the cylinder 21 through a first pressing strip 32 and fixed on the middle upper part of the shaft enclosure wall 1 through a second pressing strip 33.

As shown in fig. 2, 4 and 6, the downdraught well of the present invention further comprises a lifting mechanism 4 for assisting the liftable enclosure 2 to move upwards along the well enclosure 1;

the sum of the weight of the liftable enclosure 2 and the friction force of the liftable enclosure 2 moving upwards along the well enclosure 1 is less than the sum of the weight of the liftable enclosure 2 discharging boiled water and the assistance provided by the auxiliary lifting mechanism 4.

The lifting mechanism 4 comprises a balancing weight 41, a pulley 42 and a pull rope 43;

pulley 42 is fixed in the upper end of well enclosure 1, pulley 42 is walked around to stay cord 43, and one end and liftable enclose fender 2 lower extreme fixed connection, the other end and balancing weight 41 fixed connection.

The working principle is as follows: the weight of the balancing weight 41 is less than the weight of the liftable enclosure 2, the sum of the buoyancy of water and the weight of the balancing weight of the liftable enclosure 2 is greater than the sum of the weight of the enclosure and the rising friction thereof, and the enclosure rises when meeting water, and the sealing component 3 is sealed.

Fig. 9 is a schematic perspective view of another embodiment of the anti-backflow air shaft of the present invention, in which a ventilation opening 11 is formed on a side surface of a well enclosure 1. While fig. 1-8 show the top of the hoistway wall 1 as an open ventilation opening 11.

As shown in fig. 10, a limiting device is arranged in a gap between the hoistway wall 1 and the liftable enclosure 2 to limit the ascending position of the liftable enclosure 2. The upper limiting block 51 is fixedly arranged at the upper part of the outer side of the shaft enclosing wall 1, the lower limiting block 52 is arranged at the lower part of the inner side of the cylinder 21 of the liftable enclosure 2, the sum of the thicknesses of the upper limiting block 51 and the lower limiting block 52 is larger than the gap distance between the shaft enclosing wall 1 and the liftable enclosure 2, when the liftable enclosure 2 rises to a limiting position, the lower limiting block 52 supports against the upper limiting block 51, and the liftable enclosure 2 cannot rise any more.

The shape of the flat section of the well enclosure wall 1 can be square or round or oval or other irregular shapes. The shape of the plane section of the liftable enclosure 2 is determined according to the shape of the well enclosure 1.

Claims

1. The utility model provides a prevent flowing backward air shaft, is including outstanding well enclosure (1) on ground and well enclosure (1) top or vent (11) of side, its characterized in that:

the lifting fence is sleeved on the outer side of the well fence (1) and can move up and down along the well fence (1);

a sealing part (3) is arranged between the liftable enclosure (2) and the well enclosure (1) to prevent accumulated water from leaking from a gap between the liftable enclosure (2) and the well enclosure (1);

the sum of the weight of the liftable enclosure (2) and the upward moving friction force of the liftable enclosure (2) along the well enclosure wall (1) is less than the weight of the liftable enclosure (2) for discharging water.

2. The anti-backflow air shaft according to claim 1, characterized in that:

the liftable enclose fender (2) include barrel (21), still include with barrel (21) lower part fixed connection's a plurality of buoyancy piece (22), the liftable encloses the weight of keeping off (2) and buoyancy piece (22) and the liftable encloses fender (2) and is less than the liftable and encloses the weight that keeps off (2) and buoyancy piece (22) row boiling water along well enclosure (1) the upwards removal frictional force sum.

3. The anti-backflow air shaft according to claim 2, characterized in that:

the sealing part (3) comprises a sealing block (31) with one end fixedly connected with the periphery of the lower part of the cylinder body (21) in a sealing way and the other end fixedly connected with the periphery of the middle upper part of the well enclosure wall (1) in a sealing way;

the sealing block (31) keeps the lower part of the liftable enclosure (2) and the middle upper part of the well enclosure (1) to be sealed and watertight in the process that the liftable enclosure (2) moves up and down along the well enclosure (1).

4. The anti-backflow air shaft according to claim 3, characterized in that:

the sealing block (31) is one of rubber skin, silica gel skin and plastic skin, and the sealing block (31) is fixed on the lower part of the barrel body (21) in a sealing mode through a first pressing strip (32) and is fixed on the middle upper part of the shaft enclosing wall (1) in a sealing mode through a second pressing strip (33).

5. The anti-backflow air shaft according to claim 1, characterized in that:

the lifting mechanism (4) is used for assisting the lifting enclosure (2) to move upwards along the well enclosure (1);

the sum of the weight of the liftable enclosure (2) and the upward moving friction force of the liftable enclosure (2) along the well enclosure wall (1) is less than the sum of the weight of the liftable enclosure (2) for discharging water and the assistance provided by the lifting mechanism (4).

6. The anti-backflow air shaft according to claim 5, characterized in that:

the lifting mechanism (4) comprises a balancing weight (41), a pulley (42) and a pull rope (43);

pulley (42) are fixed in well enclosure (1) upper end, pulley (42) are walked around in stay cord (43), and one end encloses fender (2) lower extreme fixed connection with the liftable, the other end and arranges balancing weight (41) fixed connection in the wind well in.