CN201470664U - Air extracting device for preventing gas concentration in pressure station motor room from exceeding standard - Google Patents

Air extracting device for preventing gas concentration in pressure station motor room from exceeding standard Download PDF

Info

Publication number
CN201470664U
CN201470664U CN2009203071323U CN200920307132U CN201470664U CN 201470664 U CN201470664 U CN 201470664U CN 2009203071323 U CN2009203071323 U CN 2009203071323U CN 200920307132 U CN200920307132 U CN 200920307132U CN 201470664 U CN201470664 U CN 201470664U
Authority
CN
China
Prior art keywords
gas concentration
press
machine room
exceeding standard
bearing box
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN2009203071323U
Other languages
Chinese (zh)
Inventor
吴江斌
施建华
曾佑欣
杜凤祥
陈磊
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wuhan Iron and Steel Group Corp
Original Assignee
Wuhan Iron and Steel Group Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wuhan Iron and Steel Group Corp filed Critical Wuhan Iron and Steel Group Corp
Priority to CN2009203071323U priority Critical patent/CN201470664U/en
Application granted granted Critical
Publication of CN201470664U publication Critical patent/CN201470664U/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

The utility model discloses an air extracting device for preventing gas concentration in a pressure station motor room from exceeding standard. The air extracting device comprises a pressure machine, a back bearing box and a front bearing box, wherein, the pressure machine, the back bearing box and the front bearing box are connected with each other through rotor shafts; the pressure machine is positioned between the back bearing box and the front bearing box; an air collection cavity is arranged between the pressure machine and the back bearing box; and another air collection cavity is arranged between the pressure machine and the front bearing box. Since the air extracting device is provided with the air collection cavities, gas leaking from a sealed position is led to a high position through the air collection cavities to be diffused by a diffusing pipe or an exhaust blower, so that the utility model can achieve the purpose of reducing the gas concentration in the pressure machine motor room, can improve the collection of leaked gas, and reduce the possibility of the formation of explosive gas in an extraction pipe.

Description

Prevent the extractor fan that pressurizing point machine room gas concentration exceeds standard
Technical field
The utility model relates to a kind of extractor fan, especially relates to the extractor fan that a kind of pressurizing point machine room gas concentration exceeds standard.
Background technology
In the metallurgical combustion gas production process, the centrifugal press that adds is a kind of plant equipment of extensively meeting the tendency, the coal gas pressurizing point that concentrated setting adds press is general production unit, but ubiquity CO concentration over-standard in the pressurization machine room, stipulate according to the national security health: working site CO content palpus≤24PPm, and on-the-spot CO content 〉=200PPm in the actual production brings harm for safety in production and worker's health.
The gas leak that adds press causes machine room CO concentration over-standard, mainly comes the shaft end seal of self-pressurization machine rotor, and the sealing of axle head position belongs to movable sealing.All the other may occur the gas leak position as: go up between the lower house, the adpting flange of turnover feed channel all belongs to static seal, static seal can fundamentally be eliminated by fastening or replacing sealing gasket, can realize zero leakage, movable sealing realizes that zero leakage is very difficult, good again seal form is also possibility degradation failure in actual use, especially adds the press needs and moves the long period continuously.
At present, the rotor shaft end seal mainly adopts labyrinth seal form, carbocyclic ring seal form.The carbocyclic ring seal form is installed complicated, cost an arm and a leg, cycle in service life and labyrinth are approaching, and in the carbocyclic ring sealing fixedly the metal spring circle of carbocyclic ring certain danger is arranged on gas compressor, when air blast vibrates very big, after carbocyclic ring was destroyed, high-speed friction between metal spring circle and rotor, the casing metal caused gas firing.Adopt the labyrinth form so add the shaft end seal of press at present more.
Be illustrated in figure 1 as the structural representation of existing pressurization arbor end labyrinth seal form, this pressurization arbor end sealing comprises upper and lower casing 17,18, pouring orifice 12, seal 13, armature spindle 14, expansion chamber 15 and sealing tooth 16.The labyrinth seal pattern that gas compressor adopts, labyrinth seal is that the ring packing tooth 16 that is arranged in order is set around armature spindle 14, form a series of throttle clearance and expansion chamber 15 between tooth and the tooth, sealing medium produces throttle effect and reaches the purpose that resistance is leaked when the gap by tortuous labyrinth.There is the gap between the armature spindle 14 of labyrinth seal and the upper and lower casing 17,18, sealing medium can leak because of " ventilative effect ", and in the unit running process, the tar that contains in the coal gas, dust impurity can aggravate to seal the wearing and tearing of tooth, the expansion cavity that gathers plug for seal, cause the sealing property variation, thereby can directly cause gas compressor axle head leakage gas to exceed standard.For example: during pressurizing point gas compressor off-duty, front and back axle head gas pressure is 5kPa, add press when operation after the axle head gas pressure reach about 25kPa, coal gas pressure reduction causes coal gas to leak, gas concentration reaches more than the 200PPm in the machine room.
The utility model content
The utility model has designed a kind of extractor fan that prevents that pressurizing point machine room gas concentration from exceeding standard, and this extractor fan has solved gas compressor and used long afterwards, and the problem that leakage gas exceeds standard may take place axle head.
In order to solve the technical problem of above-mentioned existence, the utility model has adopted following scheme:
A kind of extractor fan that prevents that pressurizing point machine room gas concentration from exceeding standard comprises adding press, after the bearing box and fore bearing case; Adding press, after the bearing box and fore bearing case connects by armature spindle; The pressurization machine is positioned between after the bearing box and the fore bearing case, add press and after the bearing box and and the fore bearing case between be respectively equipped with an air collecting chamber.
Further, air collecting chamber comprises the steel plate of making air collecting chamber, and steel plate respectively and add between the upper and lower casing of press and the fore bearing case and carry out enhanced leaktightness by rubber blanket.
Further, also comprise wandering arm, gas collection arm and exhaust stack; Wandering arm one end is communicated with air collecting chamber, and its other end is communicated with the gas collection arm; The house steward of confluxing is communicated with many unit gas collection arms, and its other end is communicated with exhaust stack.
This prevents that extractor fan that pressurizing point machine room gas concentration exceeds standard compared with prior art, has following beneficial effect:
(1) because the utility model is provided with air collecting chamber, the coal gas that wandering pipe or process air exhauster leak sealing place causes eminence by this air collecting chamber and diffuses.Thereby reach the purpose that reduces pressurization machine room gas concentration, and strengthen collection, reduce the possibility that forms explosion gas in the exhaust tube leakage gas.
(2) because the utility model mounted valve on each wandering arm owing to each seal point gas leak difference of unit, is rationally adjusted the each point negative pressure by regulating this valve folding.
(3) because the utility model is provided with an air exhauster confluxing between house steward and the exhaust stack.Because wandering pipe only is set in the actual motion, in wandering pipe, produce laying dust incrustation, cause negative pressure not enough, the device air exhauster can improve the negative pressure of pipeline.
(4) because the utility model can not change and add the press structure, device is simple, and is easy to implement.
Description of drawings
Fig. 1 is the labyrinth seal form structure schematic diagram of existing pressurization arbor end sealing;
Fig. 2 is that the utility model prevents the extractor fan structural representation that pressurizing point machine room gas concentration exceeds standard;
Fig. 3 is the air collecting chamber structural representation that the utility model prevents the extractor fan that pressurizing point machine room gas concentration exceeds standard.
Description of reference numerals:
10-adds press; The 11-upper casing; The 12-pouring orifice; The 13-seal; The 14-armature spindle; The 15-expansion chamber; 16-seals tooth; 17-coal gas; The 18-lower casing; The 21-after the bearing box; 22-fore bearing case; The 3-air collecting chamber; The 31-steel plate; 32-rubber; The 4-motor; The 50-arm that scatters; The 51-valve; The 52-valve; 60-gas collection arm; The 61-house steward of confluxing; The 7-air exhauster; The 8-exhaust stack.
The specific embodiment
Below in conjunction with Fig. 2 and Fig. 3, the utility model is described further:
As shown in Figure 2, a kind of extractor fan that prevents that pressurizing point machine room gas concentration from exceeding standard comprises adding press 10, after the bearing box 21 and fore bearing case 22; Adding press 10, after the bearing box 21 and fore bearing case 22 connects by armature spindle 14; Add press 10 between after the bearing box 21 and fore bearing case 22, add press 10 and after the bearing box 21 and and fore bearing case 22 between be respectively equipped with an air collecting chamber 3.
Also comprise wandering arm 50, gas collection arm 60 and exhaust stack 8; Wandering arm 50 1 ends are communicated with air collecting chamber 3, and its other end is communicated with gas collection arm 60; The house steward 61 of confluxing is communicated with the gas collection arm 60 that Duo Tai adds press, and its other end is communicated with exhaust stack 8.This coal gas 17 that adds in the press 10 leaks through shaft end seal, and at the laggard arm 50 of going into to scatter of air collecting chamber 3 gatherings, enter many house stewards 61 of confluxing that unit is shared through valve 51 throttlings control then, directly enter exhaust stack 8 again and drain in the upper atmosphere, perhaps pass through air exhauster 7 forced drafts after exhaust stack 8 drains in the upper atmosphere.
Usually, pressurization machine room operated by rotary motion has many rather than one to add press, add the front and back bearings case 22,21 of press and add two wandering arms 50 that press draws from every and enter a gas collection arm 60, the gas collection arm 60 of every unit all is connected to the house steward 61 of confluxing.For example have five to add press, every centre distance is 6 meters, and all mode connects like this, and the house steward's 61 of then confluxing length is about 30 meters, can consider to add the centre position that press and exhaust stack 8 are arranged on the house steward 61 of confluxing.
One valve 51 is installed, because each seal point gas leak difference of unit is rationally adjusted the each point negative pressure by regulating these valve 51 apertures on wandering arm 50 or air collecting chamber 3.
When gas collection arm 60 is installed with the house steward 61 of confluxing, leave certain slope between the two, this gradient can prevent that tar and dust from gathering blocking pipe.
Conflux and be provided with an air exhauster 7 between house steward 61 and the exhaust stack 8, if exhaust stack 8 only is set, produce laying dust incrustation at actual motion in wandering arm 50, the house steward 61 of confluxing, conflux house steward 61 and exhaust stack 8, cause negative pressure not enough, device air exhauster 7 can improve the negative pressure of pipeline.
Install by-passing valve on the air exhauster 7, when the directly wandering discharging modes of leakage coal gas satisfy hygienic requirements, just do not need to move air exhauster 7, reach purpose of energy saving.
House steward's 61 ends that conflux are provided with a cleaning flange.
As shown in Figure 3, air collecting chamber 3 comprises the steel plate 31 of making this air collecting chamber 3, and steel plate 31 respectively and add between the upper and lower casing 11,18 of press 10 and the fore bearing case 22,21 and carry out enhanced leaktightness by rubber blanket 32.Because upper and lower casing 11 is irregular, between bearing box cover and upper and lower casing 11,18, use rubber blanket 32, can enhanced leaktightness.But this air collecting chamber 3 is leaked gas anything but, and actual conditions do not allow anything but yet and to leak, and this can cause coal gas 17 to be gone here and there in the forward and backward bearing housing 22,21, and this is unallowed.Therefore to air collecting chamber 3 negative pressure whether enough rigorous ways be on air collecting chamber 3 or the pipeline section of a minor valve 52 is installed in wandering arm 50 bottoms, open valve 52 and can detect and whether have coal gas to leak.
During concrete the installation, fan delivery and the blower fan following formula that boosts calculates:
1, fan delivery is calculated
The leakage flow of separate unit unit one side shaft sealing is approximately orifice outflow, and is relevant with gas pressure and seal clearance: computing formula: Because labyrinth seal discharge coefficient μ is difficult to determine, and air collecting chamber is not sealing fully, can adopt gas safety flow velocity experience account form in the reality:
The permissible velocity of coal gas is meant that electrostatic spark excessive when gas speed or that prisoner's air-flow wadding disorderly produces can set off an explosion.Facts have proved that the coke-stove gas permissible velocity is controlled at below the 8m/s, can select the exhaust branch pipe gas speed is 4-6m/s.
Compressor flow Q=3600 * 0.785 * d2 * v * 2 * n (this extractor fan is provided with the n platform and adds press, adds former and later two shaft end seals of press with every and calculates)
2, the blower fan calculating of boosting
Blower fan produces gives birth to and presses gas in the pressure difference (p row-p suctions) that is used to overcome exhaust space and breathing space and supply suction line and the gas exhaust piping to overcome energy (p exclusion+p resistance to suction) and the gas that resistance consumes to arrange 2/2g at the dynamic pressure γ v that exhaust outlet has:
H=p row-p suction+p exclusion+p resistance to suction+γ v arranges 2/2g
Though the utility model discloses as above with preferred embodiment; right its is not in order to limit the utility model; under the situation that does not deviate from the utility model spirit and essence thereof; those of ordinary skill in the art ought make various corresponding changes and distortion according to the utility model, but these corresponding changes or distortion all should belong to the protection domain of the appended strong request of the utility model.

Claims (8)

1. an extractor fan that prevents that pressurizing point machine room gas concentration from exceeding standard comprises adding press (10), after the bearing box (21) and fore bearing case (22); Described press (10), after the bearing box (21) and the fore bearing case (22) of adding connects by armature spindle (14); The described press (10) that adds is positioned between described after the bearing box (21) and the described fore bearing case (22), it is characterized in that: be respectively equipped with an air collecting chamber (3) in described adding between press (10) and the described forward and backward bearing housing (22,21).
2. according to the described extractor fan that prevents that pressurizing point machine room gas concentration from exceeding standard of claim 1, it is characterized in that: described air collecting chamber (3) comprises the steel plate (31) of making described air collecting chamber (3), and described steel plate (31) carries out enhanced leaktightness by rubber blanket (32) respectively and between described upper and lower casing (11,18) that adds press (10) and the described fore bearing case (22,21).
3. according to claim 1 or the 2 described extractor fans that prevent that pressurizing point machine room gas concentration from exceeding standard, it is characterized in that: also comprise wandering arm (50), gas collection arm (60) and exhaust stack (8); Described wandering arm (50) one ends are communicated with described air collecting chamber (3), and its other end is communicated with gas collection arm (60); The described house steward's of confluxing (61) one ends are communicated with many described gas collection arms (60) that add press, and its other end is communicated with described exhaust stack (8).
4. according to the described extractor fan that prevents that pressurizing point machine room gas concentration from exceeding standard of claim 3, it is characterized in that: go up mounted valve (51,52) at described wandering arm (50) or described air collecting chamber (3).
5. according to the described extractor fan that prevents that pressurizing point machine room gas concentration from exceeding standard of claim 3, it is characterized in that: when described gas collection arm (60) is installed with the described house steward of confluxing (61), have certain slope between the two.
6. according to claim 4 or the 5 described extractor fans that prevent that pressurizing point machine room gas concentration from exceeding standard, it is characterized in that: be provided with an air exhauster (7) between described house steward of confluxing (61) and the described exhaust stack (8).
7. according to the described extractor fan that prevents that pressurizing point machine room gas concentration from exceeding standard of claim 6, it is characterized in that: described air exhauster (7) is gone up the device by-passing valve.
8. according to claim 4, the 5 or 7 described extractor fans that prevent that pressurizing point machine room gas concentration from exceeding standard, it is characterized in that: the described house steward of confluxing (61) end is provided with a cleaning flange.
CN2009203071323U 2009-07-31 2009-07-31 Air extracting device for preventing gas concentration in pressure station motor room from exceeding standard Expired - Fee Related CN201470664U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2009203071323U CN201470664U (en) 2009-07-31 2009-07-31 Air extracting device for preventing gas concentration in pressure station motor room from exceeding standard

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2009203071323U CN201470664U (en) 2009-07-31 2009-07-31 Air extracting device for preventing gas concentration in pressure station motor room from exceeding standard

Publications (1)

Publication Number Publication Date
CN201470664U true CN201470664U (en) 2010-05-19

Family

ID=42406903

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2009203071323U Expired - Fee Related CN201470664U (en) 2009-07-31 2009-07-31 Air extracting device for preventing gas concentration in pressure station motor room from exceeding standard

Country Status (1)

Country Link
CN (1) CN201470664U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102814314A (en) * 2012-08-21 2012-12-12 唐祥国 Treatment device for recycling exhaust gas of gas station
CN103212560A (en) * 2013-04-17 2013-07-24 青岛老三东食品股份有限公司 Air quantity-controllable dedusting system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102814314A (en) * 2012-08-21 2012-12-12 唐祥国 Treatment device for recycling exhaust gas of gas station
CN102814314B (en) * 2012-08-21 2015-08-05 唐祥国 A kind of gas station waste gas recovery treating apparatus
CN103212560A (en) * 2013-04-17 2013-07-24 青岛老三东食品股份有限公司 Air quantity-controllable dedusting system

Similar Documents

Publication Publication Date Title
CN201470664U (en) Air extracting device for preventing gas concentration in pressure station motor room from exceeding standard
CN201103402Y (en) Mine down-hole tunnel ventilating device
CN202203649U (en) Pneumatic sealing oil baffle for bearing housing
CN102980281B (en) Double-seal leak-tightness efficient air supply outlet
CN205297957U (en) Novel water -ring type vacuum pump
CN201627725U (en) Water-cooled single-screw air compressor
CN201412353Y (en) Packing-sealed single-stage water-ring vacuum pump
CN109268054B (en) Ventilation and dust removal system for underground large-section and long-distance tunneling surface
CN203258075U (en) Dual-seal oil catch device
CN205587124U (en) Coal pulverizer sealing device with reduce coal pulverizer air leakage coefficient function
CN205349433U (en) Differential sealing device
CN205851074U (en) A kind of coal pulverizer sealing device with anti-accumulation coal dust function
CN203384379U (en) Air-flowing type shaft sealing device
CN201794931U (en) Oil leakage prevention system for sliding bearing on motor
CN213981025U (en) Bearing oil mist absorbing device is derived in power station
CN202545335U (en) Shaft seal of nuclear-grade centrifugal fan
CN2500846Y (en) Inflating sealer for leaked shaft sealing of gas fan
CN206635268U (en) A kind of airtight valve of production of carbon black
CN210859320U (en) Air isolation device for process air compressor
CN212428957U (en) Nitrogen sealing system with stator blade adjusting cavity seal for turboexpander
CN206522269U (en) One kind prevents gas-blowing engine back wall band gas leak device
CN202520958U (en) Gas sealing system for hydrogenerator
CN207494182U (en) A kind of efficient metallographical cutter exhaust system
CN212428958U (en) Nitrogen sealing system for turboexpander with bearing box cooling
CN207582570U (en) Vacuum breakdown device of vacuum in a kind of hydroelectric power plant's pipeline

Legal Events

Date Code Title Description
GR01 Patent grant
C14 Grant of patent or utility model
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20100519

Termination date: 20160731

CF01 Termination of patent right due to non-payment of annual fee