CN102864912A - Non-nail connection combined fire-proof exhaust duct and producing method thereof - Google Patents
Non-nail connection combined fire-proof exhaust duct and producing method thereof Download PDFInfo
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- CN102864912A CN102864912A CN2012101645387A CN201210164538A CN102864912A CN 102864912 A CN102864912 A CN 102864912A CN 2012101645387 A CN2012101645387 A CN 2012101645387A CN 201210164538 A CN201210164538 A CN 201210164538A CN 102864912 A CN102864912 A CN 102864912A
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Abstract
The invention discloses a non-nail connection combined fire-proof exhaust duct and a producing method thereof. The non-nail connection combined fire-proof exhaust duct is formed in a manner that a plurality of fire-proof slabs are cut to have meshing structures at connecting positions at the lateral end according to the size required by design requirements, the corresponding meshing structures of the slabs are butted and fitted, and adhesive is coated on the connecting positions. According to the novel connecting technique, the combined fire-proof box exhaust duct overcomes the fatal defects that traditional nail connection combined fire-proof exhaust ducts in the market are not corrosion resistant, not durable, and the whole flue may cause smoke leakage or falling apart. The combined fire-proof exhaust duct in the novel connecting technique is resistant to corrosion due to SO2, CO2, H2O (vapor) and free C1- ions, safe, reliable and long in service life, and the product quality conforms to national standards. Besides, the connecting technique can also be applied to parallelly connecting small fire-proof slabs into large ire-proof slabs.
Description
Technical field
Casing smoke vent or other exhaust ducts, particularly employing that the present invention relates to utilize fire proofing material to make are connected fireproof box smoke vent or other various casings, kitchen chimney flue, air-conditioning stack, elevator exhast duct, lavatory exhast duct and the Workshop exhast duct that technique is made some fire-proof boards without nail.
Background technology
It is high that glass magnesium fire-proof board has mechanical strength, fire prevention, and water-fast, energy-conservation, environmental protection can be sawed, and can follow closely, and the characteristic such as can reprocess, and in fact this sheet material is to belong to magnesia cement product category.The magnesite industry product of China develops, and has experienced the tortuous process of repeated rises and falls.As far back as nineteen fifties, China has just begun the work of magnesite resources development and utilization, owing to being subjected to the at that time restriction of working condition and technical level, the development and use of magnesite resource are not widely applied.Since the last century the eighties, folk building and large-scale fitting-out work progressively have been applied to.Because glass fiber plate has high temperature resistant, water-fast property, is widely used at present making various types of fire-proof flues (comprising the washroom exhast duct), the flue of ordinary Portland cement flue and other materials has been received good effect on the alternative in the past market.
Yet, casing flue and other exhaust duct combining structures with the making of glass magnesium fire-proof board from the domestic market sale, almost all be connected with zinc-plated nail and combine, although zinc-plated nail has anticorrosive coat, but the antisepsis of this layer galvanized anticorrosive layer is comparatively speaking, in case anticorrosive coat is broken, the irony nail will be corroded, and very likely pass in time and greatly shorten the application life of flue.This is because there is the C1 of a certain amount of free situation in the glass magnesium sheet material plastid
-Ion and the metal ion that is more or less brought by raw material can form villaumite under certain condition, and villaumite have stronger corrosivity to zinc-plated nail.Its two, contain a certain amount of SO in the kitchen flue gas
2, CO
2Gas, sulfur dioxide and carbon dioxide all are to belong to sour gas to have corrosivity; Its three, contain a large amount of H in the air
2O
(vapour)And O
2, under higher temperature condition, O
2And H
2O
(vapour)Can break through the zinc coat that is exposed to appearance and corrode Fe.As seen, although zinc-plated nail has corrosion-resisting function, As time goes on, villaumite gets rusty iron nail very likely to the corrosion of coating and break through zinc-plated topping and active Fe reacts.In a single day iron nail gets rusty, and just loses the intensity of iron nail self, thereby weakens glass magnesium fireproof box smoke vent or other exhaust ducts linking intensity and produce linear crack, slightly reveals flue gas, and flue loses due function.If iron nail corrosion fracture, the linking intensity of flue combining structure then seriously reduce, whole flue is fallen apart, produce collapse accident, make to occupy the family lives and properties and be on the hazard.
As seen, glass magnesium fire-proof board in the situation that have villaumite to exist and situation that sulfur dioxide and carbon dioxide exist under, the zinc coat diaphragm is intersexuality sometimes to the protective effect of iron nail.That is to say that time one long, do not have protective effect and iron nail is corroded.Therefore, seek to change the existing spike linking of restriction glass magnesium fireproof discharge flue or washroom exhaust duct combining structure technique, become problem that needing to demand at present solution urgently.
Summary of the invention
The purpose of this invention is to provide and a kind ofly can overcome existing fireproof box smoke vent and be connected group technology with nail and easily corroded and make the deadly defect that whole flue falls apart and design and a kind ofly be connected group technology without nail, solved fundamentally that fireproof box, smoke vent or exhaust duct, toilet exhaust passage are easily corroded with iron nail linking group technology and problem that whole flue is fallen apart.
Technical scheme of the present invention is achieved in that
Nail no longer adopts zinc-plated nail that fire-proof flue or exhaust duct are carried out nail formula linking combination, but adopts the technique of meshing structure cohesion combination the problem of above-mentioned glass magnesium fireproof box smoke vent or exhaust duct existence.
The fireproof discharge flue that is connected combination without nail, it is characterized in that: after some fire-proof boards are designed according to required physical dimension, junction in side or termination cuts out meshing structure, the fire-proof board of meshing structure and the corresponding box body shape that is connected into of sheet material that needs to be connected combination, junction scribbles adhesive.
Above-described fireproof box exhast duct comprises various casings, kitchen chimney flue, air-conditioning stack, elevator exhast duct, washroom exhast duct and Workshop exhast duct.
The position of above-described meshing structure cohesion is concave, convex shape, and the protruding top of sheet material side embeds in the groove of another piece sheet material reservation;
The position of above-described meshing structure cohesion is the angle profile of tooth that certain angle is arranged, and the angle of sheet material side embeds in the angle of another piece sheet material reservation, and the angle of linking is the 5-95 degree;
The position of above-described meshing structure cohesion can be mixed-shaped, the sheet material side is the combination of angle profile of tooth and concave, convex shape, the sheet material that another piece is connected is corresponding with it, and purpose is so that some glass magnesium fire-proof board linkings become the fireproof box flue or toilet exhaust passage is more firm.
The transverse cross-sectional profile of above-described fireproof discharge flue is rectangular tube, box section or shape tube.
Above-described nothing nail linking group technology can be angle of parallelism profile of tooth combining structure or parallel concave, convex shape combining structure or the parallel mixing shape combining structure between the sheet material.
The material of above-described making fireproof discharge flue should comprise the glass magnesium fire-proof board of various prescriptions, for example take magnesia, magnesium chloride and Vegetrable fibre material as main component, can add the auxiliary materials such as calcium carbonate, titanium dioxide, silicate.
Its production method may further comprise the steps:
(1) raw material is prepared: with magnesia, string (agriculture and forestry organic waste material) debris material, stir into compound at agitation tank;
(2) preparation saltwater brine: with magnesium chloride, titanium dioxide etc. and suitable quantity of water in proportion in the adding halogen pond stirring make and mix saltwater brine;
(3) mixed pulp: in mixing agitator, the 1st compound that makes of step is injected saltwater brine, perhaps add after other material mixes, mix pulping;
(4) sizing material forming: put forming machine and push the 3rd mixed slurry that makes of step is defeated, be lining with complex function cloth, on the rearmounted rack die of moulding and produce primary product;
(5) change into maintenance: the 4th primary product that make of step are carried put fog room and change into the demoulding after the maintenance, put and carry out again maintenance in some hours under the room temperature condition and solidify;
(6) finishing cutting: the product periphery that the 5th step was made cuts, packs, puts in storage.The product that the 5th step made can also be carried out the surface as required and brighten, cut again, pack, put in storage.
The above adhesive on junction scribbles can be magnesite bonding agent or other fire prevention bonding agents.This is because one be as the inserts of filling meshing linking slit; The 2nd, strengthen linking intensity as bonding agent, to guarantee that seam crossing is air tight and it is more firm, durable to be connected combination.If adopt the magnesite bonding agent should comprise following raw materials according and weight fraction ratio:
Magnesium oxide powder activity 〉=85% 20-70 part;
Magnesium chloride Mg Cl
2〉=43 % 5-13 parts;
0.02-0.05 part of phosphoric acid;
Or tricresyl phosphate hydrogen is received 0.03-0.05 part;
Water (tap water) is an amount of;
The position of above-described meshing structure cohesion is concave, convex shape, and the protruding top of sheet material one side embeds in the groove of another piece sheet material reservation;
Abovely saidly close the parallel linking that structure can be an end and the other end between the two boards material without spike-tooth.
The beneficial effect of patent of the present invention:
1, the present invention utilizes the mechanical strength of glass magnesium fire-proof board self and can follow closely, can saw, the characteristic that can reprocess, the junction of four specific physical dimensions of sheet material of casing smoke vent (or exhaust duct of other shapes) (length * wide * height) is sawn into various shapes, and then utilize sawtooth that the sheet material linking is combined, coat again and insult magnesium bonding agent or other bonding coating etc. of preventing fires.Make flue (or other exhast ducts) firmer, durable, fundamentally overcome iron nail and be connected combination, and corrosion resistant not, short-life situation has prolonged product application life, is benefited ten thousand.
2, the present invention uses the glass magnesium sheet material and makes casing smoke vent (or other exhaust ducts) and carry out the combination of nothing nail, mainly adopts tooth angle shape, and concave, convex shape is so that the mutual tight meshing linking in staggered position.The convenient combination in staggered position is regulated, and can play the barb effect, is difficult for getting loose after making the combination of two boards material, thereby reaches without nail combination purpose.Overcome glass fireproof box smoke vent and adopted the conventional combination form to cause zinc-plated nail because of corrosion fracture, flue produces the deadly defect that linear crack is leaked flue gas or collapsed.
3, be connected combination glass magnesium fireproof box smoke vent (or other exhaust ducts) mechanical strength without nail high, good seal performance, product quality meets state specified standards.Be that glass magnesium material goods process technology once changes newly, filled up the glass magnesium material is made combination without nail blank.
4, be connected combination glass magnesium fireproof box smoke vent (or other exhaust ducts) without nail and be not afraid of S0
2, C0
2, H
2O(vapour) and the corrosion of free C1-ion, safe and reliable, long service life has good Social benefit and economic benefit.
5, be connected combination glass magnesium fireproof box flue (or other exhaust ducts) cost of manufacture without nail and be connected combination a little more than traditional nail that has.But from flue (or other exhast ducts) application life, safe and reliable, the aspects such as environmental protection and energy saving are seen, are connected combination glass magnesium fireproof discharge flue (or other exhast ducts) without nail and have larger advantage in market.
Description of drawings
Fig. 1 is the structure chart that is connected the straight tooth-shaped linking combination of the fire prevention exhaust duct that makes up without nail;
Fig. 2 is the structure chart that is connected combination without the angle profile of tooth of the fireproof box smoke vent of nail linking combination or exhaust duct;
Fig. 3 is fireproof box smoke vent or the straight tooth-shaped of exhaust duct and the structure chart that profile of tooth mixing in angle is connected combination that is connected combination without nail;
Fig. 4 is the structure chart that is connected two fire-proof board straight parallel profiles of tooth linking combinations of combination without nail;
Fig. 5 is the structure chart that is connected two fire-proof board angle of parallelism profiles of tooth linking combinations of combination without nail;
Fig. 6 mixes the structure chart that is connected combination without two fire-proof board straight parallel profiles of tooth and angle profile of tooth that nail is connected combination;
The specific embodiment
Such as Fig. 1-shown in Figure 6, the fireproof box smoke vent or the exhaust duct that are connected combination are by some glass magnesium fire-proof boards are sawn into meshing structure according to the required size design at the junction of side, then dock with the fire-proof board of the junction of another side, coat at the position that is connected at last and insult the bonding slurry of magnesium or other fire prevention bonding materials etc.As shown in the figure: the 1st, sheet material, the 2nd, junction, the 3rd, sheet material.With the sheet material docking that needs are connected, make it to coat binder and can obtain product in conjunction with closely.The transverse cross-sectional profile of product can be rectangular tube, box section or shape tube.
Length * wide * high 450 * 300 * 3000mm
Get specification fire-proof board 3000*1220*15mm sheet material is sawn into two that need to be connected by the requirement of fireproof box flue physical dimension, then select to be connected combination by the angle profile of tooth, junction is sawn into the angle profile of tooth, will rectificates * wide * high (450 * 300 * 3000 mm) so that the fireproof box smoke vent of combination can reach the regulation physical dimension.In order to increase the service life, safe and reliable, environmental protection and energy saving in the situation that it is higher to make on-the-spot temperature, adopt the magnesite bonding agent should comprise following raw materials according and component ratio: 50 parts in magnesia; 12 parts in magnesium chloride; 0.02 part of phosphoric acid; Water (tap water) is an amount of, and the magnesite bonding agent is reconciled into slurry, then slit inside and outside the fireproof box smoke vent is coated with spreading mass, wait solidifying rear warehouse-in.
Length * wide * high 600 * 450 * 3000 mm
Get two of specification fire-proof boards (3000 * 1220 * 15 mm), sheet material is sawn into each two of A type (600mm) Type Bs (450mm) by the requirement of fireproof box smoke vent physical dimension, then select to press straight tooth-shaped and angle profile of tooth mixing linking combination, junction is sawn into the mixing profile of tooth, will rectificates * wide * high (600 * 450 * 3000mm) so that the fireproof box smoke vent of combination can reach the regulation physical dimension.In order to increase the service life, safe and reliable, environmental protection and energy saving in the situation that it is moderate to make on-the-spot temperature, adopt the magnesite bonding agent should comprise following raw materials according and component ratio: 70 parts in magnesia; 10 parts in magnesium chloride; Water is an amount of; Tricresyl phosphate hydrogen is received 0.01 part; The magnesite bonding agent is reconciled into slurry, then slit inside and outside the fireproof box smoke vent is coated with spreading mass, wait solidifying rear warehouse-in.
Length * wide * high 300 * 250 * 2000 mm
Get 1 of specification fire-proof board (3000 * 1220 * 15 mm), sheet material is sawn into each two of A type (300mm) Type Bs (250mm) by the requirement of fire-proof flue physical dimension, then select to press straight tooth-shaped and be connected combination, junction is sawn into straight tooth-shaped, will rectificates * wide * high (300 * 250 * 3000mm) so that the exhast duct of combination can reach the regulation physical dimension.In order to increase the service life, safe and reliable, environmental protection and energy saving in the situation that it is low to make on-the-spot temperature, adopt the magnesite bonding agent should comprise following raw materials according and component ratio: 50 parts in magnesia; 8 parts in magnesium chloride; Water (tap water) is an amount of; Tricresyl phosphate hydrogen is received 0.03 part; The magnesite bonding agent is reconciled into slurry, then slit inside and outside the casing is coated with spreading mass, wait solidifying rear warehouse-in.
Embodiment 4. produces qualified plate product by the material composition of summary of the invention making fire-proof board with processing step and carries out parallel linking as decorative panel, and physical dimension requires as follows:
The length of side * length of side 2000 * 2000 mm
Get two of specification fire-proof boards (3000 * 1220 * 15 mm), sheet material is connected physical dimension requires to be sawn into each 1 of A type (2000mm) Type B (2000mm), then select to press straight tooth-shaped and angle profile of tooth mixing linking combination, junction is sawn into the mixing profile of tooth, reaches regulation physical dimension requirement (2000mm) so that be connected the sheet material of combination.In order to increase the service life, safe and reliable, environmental protection and energy saving in the situation that it is moderate to make on-the-spot temperature, adopt the magnesite bonding agent should comprise following raw materials according and component ratio: 60 parts in magnesia; 15 parts in magnesium chloride; Water (tap water) is an amount of; Tricresyl phosphate hydrogen is received 0.015 part; The magnesite bonding agent is reconciled into slurry, then slit inside and outside the casing is coated with spreading mass, wait solidifying rear warehouse-in.
Embodiment 5. produces qualified plate product making fireproof box smoke vent by raw material components and processing step that summary of the invention is made fireproof box smoke vent sheet material, and physical dimension requires as follows:
Length * wide * high 300 * 300 * 3000 mm
Get 1 of specification fire-proof board (3000 * 1220 * 15 mm), sheet material is sawn into each two of A type (300mm) Type Bs (300mm) by the requirement of air conditioning box body exhast duct physical dimension, then select to press straight tooth-shaped and be connected combination, junction is sawn into 13 of right angle profiles of tooth, so that the casing exhast duct of combination can reach the regulation physical dimension wide * of * that will rectificate is high by (300 * 300 * 3000mm).In order to increase the service life, safe and reliable, environmental protection and energy saving because it is high to make on-the-spot temperature, adopt the magnesite bonding agent should comprise following raw materials according and component ratio: 450 parts in magnesia; 12 parts in magnesium chloride; Water (tap water) is an amount of; 0.03 part of phosphoric acid; The magnesite bonding agent is reconciled into slurry, then slit inside and outside the casing is coated with spreading mass, wait solidifying rear warehouse-in.
Concrete making and installation and installation process
The glass magnesium fire-proof board that 1, will meet state-set standard, according to smoke vent, the specific physical dimension blanking of (or other exhast ducts) designing requirement is again at sawed material require junction, in conjunction with the thickness of sheet material, select the length of " concave, convex " sawtooth.The optional zigzag fashion of sawtooth, or be 90 ° right angle type, also can other profiles of tooth, and each meshing spacing that is connected part is not more than 20 centimeters, for example will design 3000 high flues, flue is connected part " concave, convex " zigzag tooth more than 10 is set possibly so.Like this, the meshing linking of ability is firm.
2, after the profile of tooth that flue (or other exhast ducts) stock board is sawed, next to assemble, the first step a: sheet material is laid in flatly surface, be 90 ° with that sheet material on another piece board material vertical earth's surface, aim at staggered position, allow the angle tooth interlock meshing linking and finish assembling.Second step: the installation of the 3rd block specifications sheet material is repeated second the same said process of sheet material.The 3rd step: the meshing assembling of the 4th block of sheet material is then different, sheet material is placed on three plate casees that assembled is on " ∪ " shape attitude flue, aims at the tooth mouth and presses from top to bottom, knocks gently, until complete meshing linking firmly is the shape for " ".
The inside and outside coated with adhesive in the meshing position of the flue that 3, will make up (or other exhast ducts) is solidified rear packing and is put on market.
Claims (8)
1. a nothing nail is connected the fire prevention exhast duct that makes up, it is characterized in that: after some fire-proof boards are designed according to required physical dimension, junction in side or termination cuts out meshing structure, the fire-proof board of meshing structure and the sheet material docking moulding that needs to be connected combination, junction coated with adhesive;
Described fire prevention exhast duct comprises various casings, kitchen chimney flue, air-conditioning stack, elevator exhast duct, lavatory exhast duct and Workshop exhast duct.
2. according to claim 1 without following closely the fireproof box smoke vent that is connected combination, it is characterized in that: described adhesive comprises the raw material of following parts by weight:
Magnesia 20-70 part;
Magnesium chloride 5-13 part;
0.02-0.05 part of phosphoric acid;
Tricresyl phosphate hydrogen is received 0.03-0.07 part;
Water is an amount of;
Described magnesia is active component greater than 85% powder;
Described content of magnesium chloride MgCl
2〉=43 %.
3. according to claim 1 without following closely the fire prevention exhast duct that is connected combination, it is characterized in that: the production method of this fire prevention exhast duct may further comprise the steps:
(1) raw material is prepared: with magnesia, agriculture and forestry organic waste material debris material, stir into compound at agitation tank;
(2) preparation saltwater brine: with magnesium chloride, titanium dioxide and suitable quantity of water in proportion in the adding halogen pond stirring make and mix saltwater brine;
(3) mixed pulp: in mixing agitator, (1) compound that makes of step is injected saltwater brine, perhaps add after other material mixes, mix pulping;
(4) sizing material forming: put forming machine and push (3) mixed slurry that makes of step is defeated, be lining with complex function cloth, on the rearmounted rack die of moulding and produce primary product;
(5) change into maintenance: (4) primary product that make of step are carried put fog room and change into the demoulding after the maintenance, put and carry out again maintenance in some hours under the room temperature condition and solidify;
(6) finishing cutting: (5) step was made the primary product periphery cut, pack, put in storage; The intermediate product that (4) step made can also be carried out the surface as required and brighten, cut again, pack, put in storage.
4. according to claim 1 it is characterized in that: the position of meshing structure cohesion is concave, convex shape without following closely the fire prevention exhast duct that is connected combination, and the protruding top of sheet material side embeds in the groove of another piece sheet material reservation.
5. according to claim 1 it is characterized in that: the position of meshing structure cohesion is the angle profile of tooth that certain angle is arranged without following closely the fire prevention exhast duct that is connected combination, and the coign of sheet material side embeds in the chamfered groove of another piece sheet material reservation, and the angle of linking is the 5-95 degree.
6. according to claim 1 it is characterized in that: the position of meshing structure cohesion is mixed-shaped without following closely the fire prevention exhast duct that is connected combination, and the sheet material side is the combination of angle profile of tooth and concave, convex shape, and the sheet material that another piece is connected is corresponding with it.
7. according to claim 1 without following closely the fire prevention exhast duct that is connected combination, it is characterized in that: fireproof box flue or exhast duct, lavatory exhaust duct transverse cross-sectional profile are rectangular tube, box section or shape tube.
8. according to claim 1 without following closely the fire prevention exhast duct that is connected combination, the linking combination can be angle of parallelism profile of tooth combining structure or parallel concave, convex shape combining structure or the parallel mixing shape combining structure between the sheet material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210164538.7A CN102864912B (en) | 2012-05-25 | 2012-05-25 | Producing method of non-nail connection combined fire-proof exhaust duct |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210164538.7A CN102864912B (en) | 2012-05-25 | 2012-05-25 | Producing method of non-nail connection combined fire-proof exhaust duct |
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| Publication Number | Publication Date |
|---|---|
| CN102864912A true CN102864912A (en) | 2013-01-09 |
| CN102864912B CN102864912B (en) | 2015-04-22 |
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ID=47444019
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210164538.7A Expired - Fee Related CN102864912B (en) | 2012-05-25 | 2012-05-25 | Producing method of non-nail connection combined fire-proof exhaust duct |
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| CN (1) | CN102864912B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104652781A (en) * | 2015-01-19 | 2015-05-27 | 张琦 | Forming process for vertical shared exhaust ducts |
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| CN87103592A (en) * | 1987-05-13 | 1987-12-09 | 黑龙江省低温建筑科学研究所 | Pearlite adhesive |
| CN1096775A (en) * | 1993-06-22 | 1994-12-28 | 毕伟 | Flame-retardant plywood |
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| CN1843746A (en) * | 2006-05-08 | 2006-10-11 | 孙庆春 | Method for manufacturing large-span light framework of green house |
| DE202008004073U1 (en) * | 2008-03-25 | 2008-07-03 | F. Willich Isoliersysteme Gmbh + Co. | Chimney element for chimneys for the discharge of flue gases |
| CN101864832A (en) * | 2010-07-19 | 2010-10-20 | 葛福祥 | Fireproof combined type smoke flue |
| CN201687178U (en) * | 2010-06-10 | 2010-12-29 | 施必祥 | House fume concentrated discharge device |
| CN201762962U (en) * | 2010-05-17 | 2011-03-16 | 尹浩 | Clamping groove-type gas-tight smoke removal air passage with high strength |
-
2012
- 2012-05-25 CN CN201210164538.7A patent/CN102864912B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87103592A (en) * | 1987-05-13 | 1987-12-09 | 黑龙江省低温建筑科学研究所 | Pearlite adhesive |
| CN1096775A (en) * | 1993-06-22 | 1994-12-28 | 毕伟 | Flame-retardant plywood |
| DE20115295U1 (en) * | 2001-09-15 | 2001-12-20 | Karl Beckmann GmbH Kamin- und Schornsteintechnik, 30165 Hannover | Chimney element |
| CN1843746A (en) * | 2006-05-08 | 2006-10-11 | 孙庆春 | Method for manufacturing large-span light framework of green house |
| DE202008004073U1 (en) * | 2008-03-25 | 2008-07-03 | F. Willich Isoliersysteme Gmbh + Co. | Chimney element for chimneys for the discharge of flue gases |
| CN201762962U (en) * | 2010-05-17 | 2011-03-16 | 尹浩 | Clamping groove-type gas-tight smoke removal air passage with high strength |
| CN201687178U (en) * | 2010-06-10 | 2010-12-29 | 施必祥 | House fume concentrated discharge device |
| CN101864832A (en) * | 2010-07-19 | 2010-10-20 | 葛福祥 | Fireproof combined type smoke flue |
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| CN104652781A (en) * | 2015-01-19 | 2015-05-27 | 张琦 | Forming process for vertical shared exhaust ducts |
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| CN102864912B (en) | 2015-04-22 |
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