CN218583141U - Rectangular labyrinth type directional hood - Google Patents
Rectangular labyrinth type directional hood Download PDFInfo
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- CN218583141U CN218583141U CN202222755520.6U CN202222755520U CN218583141U CN 218583141 U CN218583141 U CN 218583141U CN 202222755520 U CN202222755520 U CN 202222755520U CN 218583141 U CN218583141 U CN 218583141U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/12—Heat utilisation in combustion or incineration of waste
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Abstract
The utility model discloses a rectangular labyrinth type directional hood, which comprises a hood connecting pipe and a hood head, wherein the hood head comprises a hood shell and a labyrinth plate, and the hood shell is a rectangular cylinder with an opening at the lower end; the opening end of the blast cap shell is connected with a sealing plate, so that the blast cap shell forms a sealed inner cavity, the upper end of a blast cap connecting pipe penetrates through the sealing plate to be communicated with the inner cavity of the blast cap shell, and the lower end of the blast cap connecting pipe penetrates through an air distribution plate to be communicated with an air chamber; the labyrinth plate is positioned in the inner cavity of the wind cap shell, the inner cavity is divided into a labyrinth type air channel, the wind cap connecting pipe is communicated with one end of the air channel, and the air outlet hole is communicated with the other end of the air channel. The blast cap shell only sets up the exhaust vent in the lower part of right side wall, and the exhaust vent is towards arranging sediment pipe orientation, enables the fluidized bed charge and produces directional flow, can blow coarse granule bed charge to row's cinder notch, blows big incombustible thing according to the design direction, does benefit to large granule lime-ash flow direction and arranges the cinder notch, discharges it smoothly, and it is more strong to also make the interior disturbance of furnace, is favorable to the burning of rubbish.
Description
Technical Field
The utility model relates to a hood especially relates to a hood for circulating fluidized bed boiler.
Background
As a clean combustion power generation technology with wide fuel adaptability, large load regulation ratio and low pollutant discharge, the circulating fluidized bed boiler is rapidly developed at home and abroad. The safe and economic operation of the circulating fluidized bed boiler is limited by various factors, the important point is that stable material circulation needs to be established, and the hood on the air distribution plate has important significance for realizing material fluidization. The hearth bottom layer air distribution device of the circulating fluidized bed boiler consists of an air distribution plate and an air cap, and the air cap assembly is arranged on the air distribution plate according to a certain arrangement mode and has the function of enabling primary air to enter the hearth bottom layer as uniformly as possible, so that bed materials are uniformly fluidized, and the combustion is sufficient. If the blast cap is improperly designed and arranged, the problems of nonuniform fluidization of bed materials, slag leakage from an air chamber, coking of a bed layer and the like easily occur, and the problems of wear of the blast cap and slag leakage from the air chamber occur in a plurality of circulating fluidized bed boilers after the circulating fluidized bed boilers are operated for a period of time. The normal operation of the unit is seriously influenced after the blast cap is worn, and the workload of maintenance and operation cost is increased; when the blast cap leaks slag, a large amount of glowing ash slag leaks to cause abrasion of the wall surface of the air chamber, and when the blast cap leaks slag, the blast cap blocks the air duct to force the boiler to stop running, thereby affecting the safety production.
In the coal-fired boiler in the prior art, the blast cap adopts a bell-type blast cap, which is formed by assembling a blast cap head and a core pipe, wherein the core pipe is fixed on an air distribution plate, and the blast cap is sleeved on the core pipe. The bell-jar type blast cap can effectively avoid slag leakage, is convenient to replace, and has the outstanding defects that the bottom material of the fluidized bed can not flow directionally, the slag discharge is not smooth, particularly, the slag discharge capacity is weaker, large particles are easy to sink and enrich, coking and poor fluidization are caused, and the problems of outer cover falling, core pipe fracture and the like exist. Meanwhile, as the area of the air distribution plate is increased after the circulating fluidized bed boiler is enlarged, large-particle materials are easy to deposit, slag discharge is difficult, even coking and blowing-out occur, and the stable operation of the boiler is influenced; for example, in a boiler for solid waste and garbage with high impurity content of fuel, because gaps exist among air hoods, metal, stone and the like with high specific gravity are gathered at the gaps when the boiler operates, the air hood heads are also easily wound by impurities such as iron wires and the like, the air hood holes are easily blocked after the boiler operates for a long time, and large particles and heavy particles are deposited on an air distribution plate and are difficult to discharge, so that the flow uniformity and stability in a bed are greatly reduced, and even the non-fluidized state of the bottom is caused; especially, when the slag block is arranged at the upper part of the blast cap blast hole, the wind blown out from the blast cap blast hole is blocked by the slag, the wind can only run downwards, and at the moment, the blast cap is subjected to the buoyancy of the upward wind, and the blast cap can be easily blown off, so that the boiler can not run normally.
In order to solve the problem of discharging foreign matters in fuels such as solid waste and the like, some companies adopt the design of a reversed L-shaped directional hood and an inclined bed surface, the hood is of a simple one-way air outlet duckbill-shaped structure, so that the problem of discharging the foreign matters is alleviated, but the directional hood cannot effectively isolate the backflow of solid particles to an air chamber, and the problems of ash leakage, uneven air distribution, poor disturbance of the bed surface and the like still exist. The factors affect the normal air distribution of the air distribution plate of the boiler, seriously affect the normal fluidization of materials in the boiler and reduce the operation efficiency of the boiler and the operation safety of boiler equipment. Especially, most municipal wastes in China have low heat value, the waste classification work is not good enough, the waste components are complex, large blocks of incombustible matters are more, a large amount of inorganic matters and even stones are also fed into a hearth, and the water content is also changed frequently; particularly, solid metal objects such as iron wires, pop cans, wine bottle caps, iron blocks and the like in the solid wastes are difficult to discharge from the slag discharge port after being softened, and the slag discharge port is easy to block; therefore, the technical difficulty in the boiler for solid wastes and garbage is to solve the problem of slag discharge while ensuring smooth fluidization of the fluidized bed. The blast cap in the prior art causes pressure fluctuation in a hearth when the water content of garbage changes, changes of smoke pressure and flow rate when a fan surges and the load of a boiler changes, causes bed materials in the hearth to enter an air chamber through small holes of the blast cap, and is difficult to discharge when large non-combustible materials enter the boiler, thereby influencing the continuous operation of the boiler.
Disclosure of Invention
An object of the utility model is to overcome prior art's not enough, provide a square labyrinth type directional hood, the directional cloth wind of hood can be realized to the hood of this kind of structure to effectively prevent in the furnace bed material through hood refluence air inlet room, effectively prevent that the hood from being blown down, the resistance is controllable, the cloth wind is even, the disturbance is strong, ensures that the boiler is long-term, high-efficient, safe operation.
The utility model discloses a realize that the technical scheme that above-mentioned purpose adopted is:
the utility model provides a directional hood of cuboid maze type, includes hood takeover and hood head, its characterized in that: the wind cap head comprises a wind cap shell and a labyrinth plate, the wind cap shell is a rectangular cylinder with an opening at the lower end, and the lower part of the right side wall of the wind cap shell is provided with at least 2 air outlet holes; the opening end of the blast cap shell is connected with a sealing plate, so that the blast cap shell forms a sealed inner cavity, the upper end of a blast cap connecting pipe penetrates through the sealing plate to be communicated with the inner cavity of the blast cap shell, and the lower end of the blast cap connecting pipe penetrates through an air distribution plate to be communicated with an air chamber; the labyrinth plate is positioned in the inner cavity of the air cap shell, the inner cavity is divided into a labyrinth air channel, the air cap connecting pipe is communicated with one end of the air channel, and the air outlet hole is communicated with the other end of the air channel.
By adopting the technical scheme, the air outlet is only arranged at the lower part of the right side wall of the air cap shell, and when the air cap is arranged on the air distribution plate, the air outlet faces the direction of the slag discharge pipe, so that slag discharge of a boiler is facilitated; the exhaust vent of uni-direction enables the fluidized bed charge to produce directional flow, and the air current flow direction that forms at the bottom of a furnace can blow coarse particle bed charge to the slag notch, blows big incombustibles according to the design direction, does benefit to large granule lime-ash flow direction slag notch, discharges it smoothly to influence boiler normal operating, can also make the interior disturbance of furnace more strong, is favorable to the burning of rubbish.
In the rectangular labyrinth type directional hood, the axis of the air outlet is inclined downwards along the air outlet direction, and the included angle between the axis and the horizontal plane is 10-30 degrees.
By adopting the technical scheme, the spraying direction of the air outlet is inclined downwards, the fluidization is more uniform, the possibility of coking is reduced, and the abrasion caused by blowing the adjacent blast caps by airflow is avoided; meanwhile, due to the downward-inclined structure of the air outlet holes, the inner disturbance of the hearth can be stronger, the combustion of garbage is facilitated, and large particles such as coal gangue in the hearth of the circulating fluidized bed boiler can not be deposited on the air distribution plate, so that the stable fluidization quality in the boiler and the normal operation of the boiler are ensured.
Furthermore, the total sectional area of the air outlet holes is smaller than that of the air inlet pipe.
By adopting the technical scheme, the wind power blown out by the hood is stronger, and the non-combustible materials are easier to push to move according to the design direction. The optimized adjustment of the hood resistance can be realized by adjusting the number of the air outlet holes.
In the above rectangular labyrinth type directional hood, the size of the hood shell in the horizontal direction is larger than that in the vertical direction.
By adopting the technical scheme, the blast cap shell is flat, after the blast caps are arranged on the air distribution plate, the grooves formed at the gaps between the adjacent blast caps are shallow, and metals, stones and the like with high specific gravity are not easy to gather at the positions when the boiler operates; when large blocks of incombustible fall on the air distribution plate, the incombustible slowly moves to the slag falling opening at the lower end along the air distribution plate by means of the gravity of the incombustible, the thrust of the fluidized bed material and the unidirectional air blowing force of the air outlet holes of the air cap, and finally enters the slag discharge pipe opening.
In the above rectangular labyrinth type directional hood, the labyrinth plate is inverted L-shaped and comprises a horizontal plate and a vertical plate which are perpendicular to each other, the front end and the rear end of the labyrinth plate are respectively connected and sealed with the front side wall and the rear side wall of the hood shell, a first air channel is formed between the horizontal plate and the sealing plate, a second air channel and a third air channel are formed between the horizontal plate and the left side wall and the upper side wall of the hood shell, the vertical plate is close to the right side wall of the hood shell, the lower end of the vertical plate is abutted and sealed with the sealing plate, a fourth air channel is formed between the vertical plate and the right side wall, and the first air channel, the second air channel, the third air channel and the fourth air channel are mutually communicated to form the labyrinth type air channel.
By adopting the technical scheme, after fluidized air enters the inner cavity of the hood from the air chamber through the hood connecting pipe, the flowing direction is changed from horizontal left, vertical upward and horizontal right to vertical downward, and then the fluidized air flows into the hearth from the air outlet in an inclined manner. Because the air current is through turning back many times, and the exhaust vent slope is downward, the deposit can not take place for the granule, and the big granule also is very difficult reversely leaks into the plenum, and the emergence of leaking the sediment phenomenon has effectively been avoided to its labyrinth structure.
Furthermore, the height of the air outlet is lower than that of the horizontal plate.
By adopting the technical scheme, the height of the air outlet is set to be lower than that of the horizontal plate, so that the vertical plate can further prevent the bed material from refluxing, a function of blocking the refluxing bed material is realized, and the material is difficult to flow back to the air chamber through the air outlet along with the wind.
Furthermore, the blast cap connecting pipe extends upwards to the horizontal plate and is sealed with the horizontal plate, and a plurality of air inlet holes uniformly distributed along the circumference of the blast cap connecting pipe are formed in the side face of the upper part of the blast cap connecting pipe.
By adopting the technical scheme, after the blast cap connecting pipe extends into the inner cavity of the blast cap shell, even if bed materials enter the inner cavity, the bed materials are not easy to enter the air chamber through the blast cap connecting pipe. The number of the air inlet holes in the air cap connecting pipe and the number of the air outlet holes in the air cap shell can be adjusted to realize the optimized adjustment of the resistance of the air cap.
Has the advantages that:
the technical scheme of the utility model, only set up the exhaust vent in the lower part of hood shell right side wall, when this hood was arranged on the grid plate, the exhaust vent orientation was arranged the sediment pipe direction, the exhaust vent of unidirectional side enables the fluidized bed material and produces directional flow, the air current flow direction that forms at the stove bottom can blow coarse grain bed material to row's cinder notch, blow the bold incombustible according to the design direction, do benefit to large granule lime-ash flow direction and arrange the cinder notch, discharge it smoothly, in order not to influence boiler normal operating, it is more strong to also make the interior disturbance of furnace, be favorable to the burning of rubbish.
The spraying direction of the air outlet is inclined downwards, the fluidization is more uniform, the possibility of coking is reduced, and the abrasion caused by blowing the adjacent blast caps by airflow is avoided; meanwhile, due to the downward-inclined structure of the air outlet hole, the disturbance in the hearth can be stronger, the combustion of garbage is facilitated, and large particles such as coal gangue in the hearth of the circulating fluidized bed boiler can not be deposited on the air distribution plate, so that the stable fluidization quality in the boiler and the normal operation of the boiler are ensured.
After the fluidized air enters the inner cavity of the hood through the hood connecting pipe from the air chamber, the air flow turns back for many times, the air outlet hole inclines downwards, particles cannot be deposited, large particles are difficult to reversely leak into the air chamber, and the labyrinth structure effectively avoids the slag leakage phenomenon.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a front sectional view of the Chinese wind cap of the present invention.
Fig. 3 isbase:Sub>A schematic top view (base:Sub>A-base:Sub>A sectional view in fig. 2) of the blast cap of the present invention.
Fig. 4 is a schematic left-side sectional view of the Chinese cowl of the present invention.
Fig. 5 is a right-side schematic view of the Chinese wind hat of the present invention.
Fig. 6 is a schematic diagram of the stepped combined arrangement of the present invention in the furnace fluidized bed.
Fig. 7 is a schematic diagram of a second embodiment of the present invention.
In the figure: 1 blast cap is taken over, 11 fresh air inlets, 2 closing plates, 3 blast cap shells, 31 exhaust vents, 4 labyrinth plates, 41 horizontal plates, 42 risers, 5 first wind channels, 6 second wind channels, 7 third wind channels, 8 fourth wind channels.
Detailed Description
In order to clearly illustrate the technical features of the present solution, the present invention is further described below by way of non-limiting examples with reference to the accompanying drawings.
The front, back, left and right directions of the utility model are described according to the front, back, left and right directions shown in the attached drawings. For ease of illustration, only the portions relevant to the embodiments of the present invention are shown.
The first embodiment is as follows:
referring to fig. 1 to 6, a rectangular labyrinth type directional hood comprises a hood adapter 1 and a hood head, wherein the hood head specifically comprises a hood housing 3 and a labyrinth plate 4, the hood housing 3 is a rectangular cylinder with an opening at the lower end, and 7 air outlet holes 31 are formed in the lower part of the right side wall of the hood housing 3; the axis of the air outlet hole 31 is inclined downwards along the air outlet direction, and the included angle between the axis and the horizontal plane is 20 degrees; the opening end of the blast cap shell 3 is connected with a sealing plate 2, so that the blast cap shell 3 forms a sealed inner cavity, and a labyrinth plate 4 is positioned in the inner cavity; the size of the hood shell 3 in the horizontal direction is larger than that in the vertical direction. Labyrinth plate 4 is the shape of falling L, constitute by mutually perpendicular's horizontal plate 41 and riser 42, the width of horizontal plate 41 is greater than the height of riser 42 in the left and right directions, labyrinth plate 4's front end, the rear end respectively with the preceding lateral wall of hood shell 3, the rear wall links to each other and seals, horizontal plate 41, form first wind channel 5 between riser 42 and the closing plate 2, horizontal plate 41 and the left side wall of hood shell 3, form second wind channel 6 and third wind channel 7 between the last lateral wall respectively, riser 42 is close to the right side wall of hood shell 3, the lower extreme supports and seals with closing plate 2, form fourth wind channel 8 between riser 42 and the right side wall, first wind channel 5, second wind channel 6, third wind channel 7, fourth wind channel 8 communicates each other and has constituteed the labyrinth wind channel. The upper end of the blast cap connecting pipe 1 penetrates through the sealing plate 2 to be communicated with a first air duct 5, and the lower end of the blast cap connecting pipe 1 penetrates through the air distribution plate to be communicated with the air chamber; therefore, the inner cavity of the air cap shell is divided into the labyrinth air channels by the labyrinth plate 4, the air cap connecting pipe 1 is communicated with the first air channel 5, and the air outlet hole 31 is communicated with the fourth air channel 8. The height of the air outlet 31 is lower than that of the horizontal plate 41. The total cross-sectional area of the air outlet holes 31 is smaller than the cross-sectional area of the air inlet pipe.
The working principle of the embodiment is as follows:
when the blast cap is arranged on the air distribution plate, the air outlet hole 31 faces to the direction of the slag discharge pipe, when the boiler normally operates, primary air flows upwards from the air chamber through the lower end of the blast cap connecting pipe 1 and firstly enters the inner cavity of the blast cap, then the flow direction is changed from horizontal left, vertical upward and horizontal right to vertical downward, and then the primary air flows into the hearth from the air outlet hole 31 in an inclined manner; because only the lower part of the right side wall of the blast cap shell 3 is provided with the air outlet 31, the air outlet 31 in a single direction can enable the bottom material of the fluidized bed to generate directional flow, the airflow formed at the bottom of the furnace can blow coarse particle bed material to the slag discharge port in the flowing direction, and large incombustible objects are blown in the designed direction, so that large particle ash residues can flow to the slag discharge port and can be smoothly discharged. When the flue gas backflow is caused by the sudden change of the water content in the fuel to cause the sudden fluctuation of the pressure in a hearth or the reduction of the flue gas pressure and flow due to the rising vibration of a fan and the change of the load of a boiler, the labyrinth air duct design and the blockage of the vertical plates 42 of the labyrinth plate 4 can effectively prevent the bed materials serving as solid particles from flowing backwards into the air return chamber.
The second embodiment:
referring to fig. 2 to 6 and 7, in this embodiment, a rectangular labyrinth type directional hood, a hood adapter 1 extends upward to a horizontal plate 41 and is sealed with the horizontal plate 41, and a plurality of air inlet holes 11 are uniformly distributed along the circumference of the upper side surface of the hood adapter 1. In the embodiment, after the blast cap connecting pipe 1 extends into the inner cavity of the blast cap shell 3, even if bed materials enter the inner cavity, the bed materials cannot easily enter the air chamber through the blast cap connecting pipe 1. The optimal adjustment of the resistance of the air cap can be realized by adjusting the number of the air inlet holes 11 on the air cap connecting pipe 1 and the air outlet holes 31 on the air cap shell 3. The rest of the structure is the same as that of the first embodiment, and is not described again.
The working principle of the embodiment is as follows:
when the blast cap is arranged on the air distribution plate, the air outlet hole 31 faces to the direction of the slag discharge pipe, when the boiler normally operates, primary air flows upwards from the air chamber through the lower end of the blast cap connecting pipe 1, rises to the top of the blast cap connecting pipe, is uniformly sprayed out through the air inlet holes 11 on the periphery of the blast cap connecting pipe 1, enters an inner cavity of the blast cap, then changes the flowing direction from horizontal left, vertical upwards and horizontal right to vertical downwards, and then flows into a hearth from the air outlet hole 31 in an inclined mode; because only the lower part of the right side wall of the blast cap shell 3 is provided with the air outlet 31, the air outlet 31 in a single direction can enable the bottom material of the fluidized bed to generate directional flow, the airflow formed at the bottom of the furnace can blow coarse particle bed material to the slag discharge port in the flowing direction, and large incombustible objects are blown in the designed direction, so that large particle ash residues can flow to the slag discharge port and can be smoothly discharged. When the pressure in the hearth fluctuates suddenly due to sudden change of water content in fuel or smoke pressure and flow are reduced due to sudden vibration of a fan and change of boiler load, and smoke flows backwards, the labyrinth air duct design and blocking of the vertical plate 42 of the labyrinth plate 4 can effectively prevent bed materials serving as solid particles from flowing backwards into the air return chamber, and the structural design that the hood connecting pipe 1 extends upwards to the horizontal plate 41 can further prevent the bed materials from flowing backwards into the air return chamber.
In the description of the present invention, it should be noted that the terms "left", "right", "front", "back", "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and the above terms are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.
In addition to the technical features described in the specification, the technology is known to those skilled in the art.
The above-mentioned embodiments are only for understanding the present invention, and are not intended to limit the technical solutions of the present invention, and those skilled in the relevant art can make various changes or modifications based on the technical solutions described in the claims, and all equivalent changes or modifications should be covered by the scope of the claims of the present invention.
Claims (7)
1. The utility model provides a directional hood of cuboid maze type, includes hood takeover and hood head, its characterized in that: the wind cap head comprises a wind cap shell and a labyrinth plate, the wind cap shell is a rectangular cylinder with an opening at the lower end, and the lower part of the right side wall of the wind cap shell is provided with at least 2 air outlet holes; the opening end of the blast cap shell is connected with a sealing plate, so that the blast cap shell forms a sealed inner cavity, the upper end of a blast cap connecting pipe penetrates through the sealing plate to be communicated with the inner cavity of the blast cap shell, and the lower end of the blast cap connecting pipe penetrates through an air distribution plate to be communicated with an air chamber; the labyrinth plate is positioned in the inner cavity of the hood shell and divides the inner cavity into a labyrinth air duct, the hood connecting pipe is communicated with one end of the air duct, and the air outlet hole is communicated with the other end of the air duct.
2. The rectangular labyrinth type directional hood of claim 1, wherein: the axis of the air outlet is inclined downwards along the air outlet direction, and the included angle between the axis of the air outlet and the horizontal plane is 10-30 degrees.
3. The rectangular labyrinth type directional hood of claim 2, wherein: the total sectional area of the air outlet holes is smaller than that of the air inlet pipe.
4. The rectangular labyrinth type directional hood of claim 1, wherein: the size of the hood shell in the horizontal direction is larger than that in the vertical direction.
5. The rectangular labyrinth type directional hood of claim 1, wherein: the labyrinth plate be the shape of falling L, constitute by mutually perpendicular's horizontal plate and riser, the front end of labyrinth plate, the rear end links to each other and seals with the preceding lateral wall of hood shell, the back lateral wall respectively, the horizontal plate, form first wind channel between riser and the closing plate, the left side wall of horizontal plate and hood shell, form second wind channel and third wind channel between the lateral wall, the riser is close to the right side wall of hood shell, the lower extreme supports with the closing plate butt and seals, form the fourth wind channel between riser and the right side wall, first wind channel, the second wind channel, the third wind channel, the labyrinth wind channel has been constituteed each other in the fourth wind channel.
6. The rectangular labyrinth type directional hood of claim 5, wherein: the height of the air outlet is lower than that of the horizontal plate.
7. The rectangular labyrinth type directional hood as claimed in claim 5 or 6, wherein: the blast cap connecting pipe extends upwards to the horizontal plate and is sealed with the horizontal plate, and a plurality of air inlet holes uniformly distributed along the circumference of the blast cap connecting pipe are formed in the side surface of the upper part of the blast cap connecting pipe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222755520.6U CN218583141U (en) | 2022-10-19 | 2022-10-19 | Rectangular labyrinth type directional hood |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222755520.6U CN218583141U (en) | 2022-10-19 | 2022-10-19 | Rectangular labyrinth type directional hood |
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| CN218583141U true CN218583141U (en) | 2023-03-07 |
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| CN202222755520.6U Active CN218583141U (en) | 2022-10-19 | 2022-10-19 | Rectangular labyrinth type directional hood |
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| CN (1) | CN218583141U (en) |
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2022
- 2022-10-19 CN CN202222755520.6U patent/CN218583141U/en active Active
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