CN205474659U - Telescopic regulation and control road bed heat convection's structure - Google Patents

Abstract

The utility model relates to a telescopic regulation and control road bed heat convection's structure, this structure is including being fixed in axle core rod on the ventilation pipe pipe wall, cup jointing the pivot sleeve pipe of axle on the core rod, be fixed in air door on the pivot sleeve pipe. Axle core rod's center is equipped with the bracing piece, and this bracing piece meets through linker I and corrugated extension tube's one end, corrugated extension tube's the other end pass through linker II with the air door meets. The utility model discloses simple structure, simple to operate, stability height can adapt to qinghai -Tibet exceedingly odious environment completely to satisfy engineering construction special requirement, the at utmost improves the cooling efficiency of ventilation road bed.

Description

A kind of structure of telescopic regulation subgrade heat convection

Technical field

This utility model relates to frozen soil engineering technical field, particularly relates to the structure of a kind of telescopic regulation subgrade heat convection.

Background technology

In Permafrost Areas such as China Qinghai-Tibet Platean, northeast, by long-term evolution, develop and change, define thickness and reach several meters, even tens meters, each Thick Underground Ice having form.Along with the change of climatic environment and being affected by Human dried bloodstains, frozen soil and ground ice can occur to degenerate and melt, thus cause the generation of various engineering project disaster, and then various Important Project structural stability are produced material impact.

Use protection of permafrost engineering measure, active cooling frozen soil basis, be to ensure that the operation of frozen soil engineering long-term safety, stable critical path.In these measures, the Convective Heat Transfer of Effective Regulation frozen soil engineering, is a type of the basic important engineering measure of protection of permafrost.Such measure, by effectively facilitating basis and the heat transfer process of external environment under winter or cool night temperatures environmental condition, effectively the heat transfer process on basis under suppression warm season or daytime high ambient conditions, thus reaches cold energy in constantly storage roadbed within, the purpose that constantly reduction, stability of foundation constantly strengthen of frozen soil ground temperature.

In the face of the appearance of country's " 13 " strategical planning, Qinghai-Tibet highway will be built, but, highway is compared with common road, and common road Frozen soil problems compared with railway is the most prominent.There are some researches show (Yu Qihao etc. key issue research built by China's Permafrost Area highway. Chinese science (science of technology), 2014,44(4): 425 ~ 432), strong endothermic, bituminous paving water proof and the impact of prevention moisture evaporative heat loss due to dark-coloured pavement, making the get down the highway heat absorption intensity of roadbed of the same terms is more than 3 times of railway, and the main path of roadbed heat absorption concentrates on the centre of embankment, and it is difficult to dispel the heat to frozen soil around.And highway is compared with common road, more exacerbate the appearance of this kind of phenomenon.When highway subgrade width increase about 1 times, the heat absorption intensity increase of embankment bottom surface about 0.6 times, roadbed heat absorption is gathered in the centre of roadbed further, thus produces " the heat build-up effect " become apparent from, and cause frozen soil more quickly to be degenerated.In the face of higher technical standard, broader highway pavement, the heat effect between highway and frozen soil is more significantly, and building highway in Permafrost Area will be in the face of the most prominent Frozen soil problems and build technical barrier.Radical change due to the aspect such as heat transfer path, intensity so that successful experience, advanced technology that Qinghai-Tibet Railway etc. obtain are difficult to directly apply in the expressway construction of Qinghai-Tibet.

Although, the heat convection of ventilation duct is regulated and controled by existing analogous technical, but, the high and cold extreme natural environment in Qinghai-Tibet Platean, special engineering condition, all to the ventilation duct regulation and control stability of air door, the sensitivity of air door, air door installs and the convenience etc. of O&M process is proposed higher requirement, and more existing technology are difficult to fully meet actual demands of engineering.

1. (the Yu Qihao such as Yu Qihao, Cheng Guodong. the zero-temperature coefficient for roadbed ventilation duct controls switch: China, 200510065354.5) and the 2. (Yu Qihao such as Yu Qihao, Chang little Xiao, Qian Jin. the convection control air door of a kind of Weight-balancing type: China 201010241354.7) automatic control air door is invented.But, in place of these two inventions still have some deficits:

(1) parts are more, invention 1. in except air door and drive piston, also piston bucket and the spring of inside thereof, and these air doors and transmission component separated, add laying difficulty.

(2) structure is complicated, employs oil and parts that water is constituted are as gravity unit, be to there is container of draining the oil to be positioned over situation about discharging water container within, add and process and maintenance difficulties inside it in invention 2..

(3) relatively big at ruthless area dusts storm such as Qinghai-Tibet Plateans, the parts that there is piston are easily subject to blocking and freeze inoperable situation, and use the oily design as gravity source of water it cannot be guaranteed that liquid well flows under low temperature state.

(4) parts are more.Thus cause that structure is complex, less stable, and cause Qinghai-Tibet Platean O&M difficulty, use cost higher.

As can be seen here, these technology are difficult to effectively work at Qinghai-Tibet Platean extreme environment, it is difficult to meet actual demands of engineering.Therefore, need the convection current regulation and control air door that multi-angle research and development disclosure satisfy that engineering is actual badly, meet Permafrost Area expressway construction needs.

Utility model content

The structure of the telescopic regulation subgrade heat convection that technical problem to be solved in the utility model is to provide a kind of simple in construction, easy for installation, stability is high.

For solving the problems referred to above, the structure of a kind of telescopic regulation subgrade heat convection described in the utility model, it is characterised in that: this structure includes being fixed on the axis rod on ventilation duct tube wall, the shaft sleeve being socketed on described axis rod, the air door that is fixed on described shaft sleeve；The center of described axis rod is provided with support bar, and this support bar is connected with one end of bellows by linker I；The other end of described bellows is connected with described air door by linker II.

Tap water or pure water are filled in the inside of described bellows.

Described bellows is connected with described linker I, described linker II by sealing member respectively.

This utility model compared with prior art has the advantage that

1, simple in construction, easy for installation, without the energy.

This utility model is compared with conventional measure, and only bellows and the combination of air door, and simple in construction, it is convenient to make, and installs and easy to maintenance.Air door switch is merely with natural cold energy simultaneously, it is not necessary to the external impetus energy, environmental friendliness.

2, action is easy, and susceptiveness is high.

Bellows in this utility model directly senses ambient temperature change, compulsory exercise can be completed in time under the conditions of design temperature, and action is only the flexible of bellows and the closedown of air door thus driven, thus avoids and changed by intermediate material or power changes the adverse effect caused.

3, stability is high.

Owing to the power source of bellows is the freezing of internal water body, expands, its expansion power is the most powerful and stably；Simultaneously as Telescopic corrugated pipe fully seals, after ice body thawing, volume contraction, the vacuum of generation and the elastic shrinkage of bellows self, the comprehensive contractility produced is the most powerful and stable.Therefore, door opening needed for this utility model, closedown driving force the most powerful and stable, these all ensure that the air door stable running under the conditions of design temperature.Thus the impact of the unfavorable factors such as Qinghai-Tibet Platean extreme wind can be prevented effectively from.

4, cheap, it is simple to large-scale use.

This utility model does not need the parts of special protection, and this air door component is common material, and simple in construction, and cost can be reduced largely, it is simple to large-scale use.

Accompanying drawing explanation

Below in conjunction with the accompanying drawings detailed description of the invention of the present utility model is described in further detail.

Fig. 1 is side view of the present utility model.

Fig. 2 is front view of the present utility model.

In figure: 1 air door；2 axis rods；3 shaft sleeves；4 bellows；5 support bars；6 linkers I；7 linkers II.

Detailed description of the invention

As shown in Figure 1 and Figure 2, the structure of a kind of telescopic regulation subgrade heat convection, this structure includes being fixed on the axis rod 2 on ventilation duct tube wall, the shaft sleeve 3 being socketed on axis rod 2, the air door 1 that is fixed on shaft sleeve 3.

The center of axis rod 2 is provided with support bar 5, and this support bar 5 is connected by one end of linker I 6 with bellows 4；The other end of bellows 4 is connected with air door 1 by linker II 7.

Wherein: the material of bellows 4 is retractility and the good and low temperature resistant metal of heat conductivity or plastics, it internal fills tap water or pure water.

Bellows 4 is connected with linker I 6, linker II 7 by sealing member respectively.

Utility model works principle:

In airtight metal or plastic ripple telescoping tube 4, it is full of water and seals.Along with seasonal temperature or the continuous decline of ambient temperature, when temperature is less than 0 DEG C, what in bellows 4, water body can occur freezes, water body freezing process can produce the expansion of 9% volume, radially limited by bellows 4 and acted on, the volume expanded in water-ice phase transition process so that bellows 4 axially expands, extends.Otherwise, when ambient temperature is higher than 0 DEG C, in bellows 4, ice body can melt, owing to bellows 4 is closed, the vacuum produced in bellows 4 after ice body thawing, volume contraction and the elastic shrinkage of bellows 4 self, the comprehensive contractility produced so that bellows 4 carries out stabilized contraction.As can be seen here, along with ambient temperature around 0 DEG C change time, bellows 4 will occur elongating or shortening of length the most vertically.

Owing to one end of bellows 4 is linked on air door 1, other end end fixing with support bar 5 links.Occurring the distance between when elongating or shortening of length, and air door 1 link ends and the fixing end of support bar 5 to change in bellows 4, i.e. under relative low temperature environment, along with the elongation of bellows 4, both distances increase, and thus promote the unlatching of air door 1.Otherwise, under high relative humidity environment, along with the shortening of bellows 4, pull the closedown of air door 1.

When natural environment seasonal temperature or diurnal temperature change, owing in bellows 4, water body volume is less, easily there is water-ice phase transition process, be thus rapidly completed being turned on and off of air door 1.

During use; this utility model is arranged on the one or both ends of ventilation duct in the ventilated type roadbed of Permafrost Area; by being turned on and off of air door 1; just can be with the Convective Heat Transfer of Effective Regulation ventilated embankment; thus reach effectively to reduce roadbed Temperature Field, make full use of cold energy and realize the purpose that digital preservation is frozen earth roadbed.

Claims (3)

1. the structure of a telescopic regulation subgrade heat convection, it is characterised in that: this structure includes being fixed on the axis rod (2) on ventilation duct tube wall, the shaft sleeve (3) being socketed on described axis rod (2), the air door (1) that is fixed on described shaft sleeve (3)；The center of described axis rod (2) is provided with support bar (5), and this support bar (5) is connected by one end of linker I (6) with bellows (4)；The other end of described bellows (4) is connected with described air door (1) by linker II (7).

The structure of a kind of telescopic regulation subgrade heat convection the most as claimed in claim 1, it is characterised in that: tap water or pure water are filled in the inside of described bellows (4).

The structure of a kind of telescopic regulation subgrade heat convection the most as claimed in claim 1, it is characterised in that: described bellows (4) is connected with described linker I (6), described linker II (7) by sealing member respectively.