CN113587300A - A dust removal ventilation unit for building warm engineering that leads to - Google Patents
A dust removal ventilation unit for building warm engineering that leads to Download PDFInfo
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- CN113587300A CN113587300A CN202110705384.7A CN202110705384A CN113587300A CN 113587300 A CN113587300 A CN 113587300A CN 202110705384 A CN202110705384 A CN 202110705384A CN 113587300 A CN113587300 A CN 113587300A
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- piece
- cleaning
- magnet
- filtering
- cleaning piece
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F7/00—Ventilation
- F24F7/003—Ventilation in combination with air cleaning
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/28—Arrangement or mounting of filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F7/00—Ventilation
- F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
- F24F7/06—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit
- F24F7/08—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit with separate ducts for supplied and exhausted air with provisions for reversal of the input and output systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
- F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
- F24F8/108—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering using dry filter elements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
- F24F8/90—Cleaning of purification apparatus
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Ventilation (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
The invention is suitable for the building heating ventilation engineering technical field, has provided a dust removal ventilation unit used for building heating ventilation engineering, including: the body is connected with a pipeline, and the filtering piece is connected with the body; the connecting piece is movably connected with the filtering piece, a first cleaning piece and a second cleaning piece are arranged on the connecting piece, and the first cleaning piece and the second cleaning piece are tightly attached to the filtering piece; the induced draft fan is connected with the pipeline; the draught fan introduces the outdoor air into the pipeline, the air enters the wind cavity and drives the first cleaning piece and the second cleaning piece to move upwards through the connecting piece and keep away from filtering piece, the first cleaning piece and the second cleaning piece move upwards in-process blocked filter piece and external intercommunication, it is indoor to be filtered the air admission of piece filtration, close the fan, the first cleaning piece and the second cleaning piece fall down, the first cleaning piece and the second cleaning piece clean the filtration hole on the filtration piece successively, but have the device of preventing to block up and clear up the effectual advantage of impurity.
Description
Technical Field
The invention belongs to the technical field of building heating and ventilation engineering, and particularly relates to a dust removal and ventilation device for building heating and ventilation engineering.
Background
The building heating and ventilation project mainly comprises: heating, ventilation and air conditioning, which are components of buildings, ventilate, as the name suggests, i.e., the process of supplying air to the room or exhausting the indoor air, replaces the indoor air with outdoor air to ensure the freshness of the indoor air.
Outdoor air often contains impurities such as dust, and needs to be filtered by a filtering mechanism before entering a room, and the filtering mechanism can cause a large amount of dust to be accumulated on the surface of a filter element after being used for a long time, so that the filter element is blocked.
Therefore, there is a need for a dust removing ventilation device for building heating and ventilation engineering to solve the above problems.
Disclosure of Invention
The embodiment of the invention aims to provide a dust removal and ventilation device for building heating and ventilation engineering, and aims to solve the problems in the background art.
The embodiment of the invention is realized in such a way that the dust removal and ventilation device for the building heating and ventilation engineering comprises: the body, the body coupling has the pipeline, still includes:
the filter element is connected with the body and is used for filtering impurities in the air;
the connecting piece is movably connected with the filtering piece, a first cleaning piece and a second cleaning piece are arranged on the connecting piece, the first cleaning piece and the second cleaning piece are tightly attached to the filtering piece, and the first cleaning piece is used for sealing the filtering piece;
the draught fan, the draught fan with the pipe connection, the draught fan is arranged in drainage air to body inner chamber to keep away from through the drive connecting piece that the air flows and filter and make body inner chamber through straining piece and external intercommunication, when the draught fan stopped the drainage, the connecting piece drives under the action of gravity that first cleaning piece and second clean one and filter and final sealed filtration piece.
As a further aspect of the present invention, the filter member is disposed between the first cleaning member and the second cleaning member, and a height of an end of the first cleaning member remote from the connecting member is greater than a height of an end of the second cleaning member remote from the connecting member.
As a further scheme of the invention, the connecting piece comprises an outer ring, an inner ring and a disc, the disc is provided with the outer ring and the inner ring, the inner side of the outer ring is provided with a first cleaning piece, the outer side of the inner ring is provided with a second cleaning piece, and the connecting piece drives the first cleaning piece and the second cleaning piece to be far away from the filter piece under the action of the induced draft fan induced air entering the inner cavity of the body.
As a further scheme of the invention, the body is provided with a dust collecting mechanism, the dust collecting mechanism comprises a sealing assembly and a telescopic piece, the sealing assembly is connected with the telescopic piece, and the sealing assembly is used for communicating or dividing the inner cavity of the body.
As a further scheme of the present invention, the sealing assembly includes a first magnet and a second magnet, the first magnet is mounted on the body, the first magnet is electrically connected to the controller, the second magnet is disposed on one side of the first magnet, the second magnet is connected to the telescopic member, and the first magnet is used for adsorbing the second magnet to divide the inner cavity of the body.
As a further scheme of the present invention, the connecting member is movably connected to a hollow body, an elastic member is disposed in the hollow body, one end of the elastic member is connected to the connecting member, the other end of the elastic member is connected to the hollow body, and the elastic member is used for pulling the connecting member.
As a further scheme of the invention, a plurality of filtering holes are arranged on the filtering piece and are used for filtering impurities.
Start the draught fan, the draught fan is introduced outdoor air in the pipeline, the air admission wind chamber and drive first cleaning piece and second through the connecting piece and clean the piece and move upward and keep away from filtering piece, first cleaning piece and second clean the piece and move upward the filter piece that the in-process was blockked up and external intercommunication, it is indoor to be filtered the air through straining a piece entering, and the connecting piece drives first cleaning piece and second under the action of gravity and cleans the piece and fall down, first cleaning piece clears up earlier and filters a surface and blocks up the filtration pore, will filter the inside impurity of pore and clean into and filter inside when blockking up the filtration pore, and the second cleans a back and filters an internal surface to clean the filtration pore, impurity falls into the dust storage intracavity under the action of gravity, has the effectual advantage of can prevent device jam and clear up impurity.
Drawings
Fig. 1 is a schematic structural diagram of a dust removal ventilation device for building heating and ventilation engineering according to an embodiment of the present invention;
FIG. 2 is an enlarged view of a portion of the structure at A in FIG. 1;
FIG. 3 is a schematic structural view of a filter element according to an embodiment of the present invention;
fig. 4 is a structural schematic view of a sweeping mechanism according to an embodiment of the present invention;
in the drawings: 1-body, 101-dust storage cavity, 102-wind cavity, 2-pipeline, 3-fan, 4-hollow body, 5-connecting rod, 6-hollow column, 601-outer ring, 602-inner ring, 603-disc, 7-sponge, 8-filter column, 801-filter hole, 9-brush hair, 10-spring, 11-dust collection ring, 12-first magnet, 13-second magnet, 14-telescopic rod and 15-door.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Specific implementations of the present invention are described in detail below with reference to specific embodiments.
As shown in fig. 1, an embodiment of the present invention includes: body 1, body 1 is connected with pipeline 2, still includes:
a filter element connected with the body 1, the filter element being used for filtering impurities in the air;
the connecting piece is movably connected with the filtering piece, a first cleaning piece and a second cleaning piece are arranged on the connecting piece, the first cleaning piece and the second cleaning piece are tightly attached to the filtering piece, and the first cleaning piece is used for sealing the filtering piece;
In this embodiment, the body 1 is tubular, the body 1 is provided with a dust storage cavity 101 and an air cavity 102, the dust storage cavity 101 is communicated with the air cavity 102, the air cavity 102 is communicated with the pipeline 2, the air cavity 102 is communicated with the inner cavity of the filtering piece, the filtering piece can be a filtering column 8, the filtering column 8 is provided with a plurality of filtering holes for filtering impurities, the induced draft fan 3 is electrically connected with a controller, the induced draft fan 3 can be a fan, the fan is started through the controller, outdoor air is introduced into the pipeline 2 by the fan, the air enters the air cavity 102 and drives the first cleaning piece and the second cleaning piece to move upwards through a connecting piece to keep away from the filtering column 8, part of the filtering holes which are blocked are communicated with the outside in the process that the first cleaning piece moves upwards, the air filtered by the filtering holes enters the room through the filtering holes and an air guide pipeline, the larger the wind force generated by the fan increases the distance that the first cleaning piece and the second cleaning piece move upwards, consequently can correspond and set up a plurality of gears in order to satisfy user's demand, close the fan, the connecting piece drives under the action of gravity that first cleaning and the second cleans the piece and falls down, first cleaning and the second cleans 8 surfaces of filter post, internal surface and filtration hole, and to each solitary filtration hole, first cleaning cleans earlier and crosses the filtration hole, sweeps into the filtration piece with the impurity in the filtration hole inside, and the second cleans this filtration hole once more, and impurity then falls under the action of gravity.
In another embodiment, the body 1 may be a box, the filter element may be a filter box, an inner cavity of the filter box is communicated with the air cavity 102 of the body 1, and a plurality of filter holes are formed around the filter box.
In one embodiment of the invention, the filter member is disposed between the first cleaning member and the second cleaning member, and a height of an end of the first cleaning member remote from the connecting member is greater than a height of an end of the second cleaning member remote from the connecting member.
In this embodiment, the connecting member may be a hollow column 6, the hollow column 6 includes an outer ring 601, an inner ring 602 and a disc 603, the disc 603 is provided with the outer ring 601 and the inner ring 602, the inner side of the outer ring 601 is provided with a first cleaning member, the outer side of the inner ring 602 is provided with a second cleaning member, the hollow column 6 drives the first cleaning member and the second cleaning member to keep away from the filtering member under the action of the induced draft fan 3 leading air to enter the body 1, the first cleaning member may be a sponge 7, the second cleaning member may be bristles 9, the height of one end of the sponge 7 from the disc 603 is greater than the height of one end of the bristles 9 from the disc 603, so when the hollow column 6 drives the sponge 7 and the bristles 9 to fall under the action of gravity, each filtering hole is cleaned by the sponge 7 first, and then cleaned by the bristles 9, the sponge 7 cleans the filtering holes first, and realizes sealing the filtering holes by blocking the filtering holes, and push the impurity in filtering the hole and filter in the piece, clean a filter piece internal surface behind the brush hair 9 to filter the hole and clean, impurity falls down under the action of gravity.
In another embodiment, the connecting member may be composed of a connecting rod and a disc 603, and a plurality of connecting rods are provided on the disc 603, and are respectively connected to the first cleaning member and the second cleaning member.
In another embodiment, the first cleaning element and the second cleaning element can be air bags, and the surfaces of the air bags are provided with a plurality of protruding friction balls.
In this embodiment, the connecting piece swing joint has hollow body 4, be equipped with the elastic component in the hollow body 4, elastic component one end with the connecting piece is connected, the elastic component other end with hollow body 4 is connected, the elastic component is used for carrying and draws the connecting piece, hollow body 4 is connected with connecting rod 5, connecting rod 5 with body 1 is connected, the elastic component can be spring 10, spring 10 is in tensile state all the time, spring 10 is used for carrying and draws the connecting piece, overcomes the partial gravity of connecting piece, reduces the wind-force size that draught fan 3 needs to provide.
In another embodiment, the elastic member may be a spring plate, the spring plate is disposed in the hollow body 4, and one end of the spring plate is connected to the connecting member.
In an embodiment of the invention, a dust collecting mechanism is arranged on the body 1 at one end of the cleaning mechanism, the dust collecting mechanism comprises a sealing assembly and an extensible member, the sealing assembly is connected with the extensible member, and the sealing assembly is used for communicating or dividing the inner cavity of the body 1.
In this embodiment, the dust collecting mechanism further includes a dust collecting body 11, the dust collecting body 11 is disposed on the body 1, the dust collecting body 11 may be a dust collecting ring, the inner surface of the dust collecting ring is processed into a slope surface with a certain slope, the body 1 is provided with a door 15, the door 15 is used for discharging impurities, the sealing assembly includes a first magnet 12 and a second magnet 13, the first magnet 12 is mounted on the body 1, the first magnet 12 is electrically connected with a controller, one side of the first magnet 12 is provided with the second magnet 13, the second magnet 13 is connected with the extensible member, the extensible member may be a telescopic rod 14, the first magnet 12 is used for adsorbing the second magnet 13 to divide the inner cavity of the body 1, the first magnet 12 may be an electromagnet other than a permanent magnet, the second magnet 13 may be a magnet other than a permanent magnet, when the induced draft fan 3 is started by the controller, the controller makes first magnet 12 electrified have magnetism, first magnet 12 adsorbs second magnet 13 and splits into wind chamber 102 and dust storage chamber 101 with body 1 inner chamber, and dust storage chamber 101 is used for storing impurity, and when draught fan 3 stopped the drainage air, first magnet 12 outage lost magnetism, no longer adsorbs second magnet 13, and second magnet 13 falls down under the action of gravity, wind chamber 102 with dust storage chamber 101 intercommunication is cleaned the impurity of piece clearance by first cleaning and second and is fallen into dust storage chamber 101 through the effect of dust collection body 11 in, through seal assembly's setting, prevents that the air from getting into and blowing impurity in dust storage chamber 101, leads to the air quality to descend to prevent aerodynamic's waste.
In another embodiment, the dust collecting body 11 can be a funnel, the funnel is disposed on the body 1, and a sealing assembly is disposed at a discharge port of the funnel.
In another embodiment, the extensible member can be electric telescopic handle 14, the seal assembly can be a seal block, electric telescopic handle 14 is connected to the seal block, the seal block can with the discharge gate of dust collecting body 11 closely laminates, drives the seal block through electric telescopic handle 14's flexible removal and realizes cutting apart body 1 inner chamber or communicating body 1 inner chamber.
The working principle of the invention is as follows:
when the fan is started through the controller, the controller enables the first magnet 12 to be electrified and magnetic, the first magnet 12 adsorbs the second magnet 13 to divide the interior of the body 1 into the air cavity 102 and the dust storage cavity 101, the fan introduces outdoor air into the pipeline 2, the air enters the air cavity 102 and drives the sponge 7 and the bristles 9 to move upwards through the hollow column 6 to be far away from the filter column 8, part of blocked filter holes in the upward movement process of the sponge 7 and the bristles 9 are communicated with the outside, the air filtered by the filter holes enters the room through the filter holes and the air guide pipeline, the controller is closed, the first magnet 12 does not adsorb the second magnet 13 any more, the second magnet 13 falls under the action of gravity, the air cavity 102 is communicated with the dust storage cavity 101, the sponge 7 and the bristles 9 fall under the action of gravity, the sponge 7 firstly cleans the outer surface of the filter elements and blocks the filter holes, impurities in the filter holes are cleaned into the interior of the filter elements while blocking the filter elements, the inner surface of the filter element is cleaned after the brush hairs 9, the filter holes are cleaned, and impurities fall into the dust storage cavity 101 under the action of gravity.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. A dust removal ventilation unit for building heating and ventilating engineering includes: the body, the body coupling has the pipeline, its characterized in that still includes:
the filter element is connected with the body and is used for filtering impurities in the air;
the connecting piece is movably connected with the filtering piece, a first cleaning piece and a second cleaning piece are arranged on the connecting piece, the first cleaning piece and the second cleaning piece are tightly attached to the filtering piece, and the first cleaning piece is used for sealing the filtering piece;
the draught fan, the draught fan with the pipe connection, the draught fan is arranged in drainage air to body inner chamber to keep away from through the drive connecting piece that the air flows and filter and make body inner chamber through straining piece and external intercommunication, when the draught fan stopped the drainage, the connecting piece drives under the action of gravity that first cleaning piece and second clean one and filter and final sealed filtration piece.
2. A dust-removing ventilating device for heating and ventilating buildings according to claim 1, wherein said filter member is provided between said first cleaning member and said second cleaning member, and the height of the end of said first cleaning member remote from said connecting member is greater than the height of the end of said second cleaning member remote from said connecting member.
3. The dust removal and ventilation device for the building heating and ventilation project according to claim 1 or 2, wherein the connecting piece comprises an outer ring, an inner ring and a disc, the disc is provided with the outer ring and the inner ring, a first cleaning piece is arranged on the inner side of the outer ring, a second cleaning piece is arranged on the outer side of the inner ring, and the connecting piece drives the first cleaning piece and the second cleaning piece to be away from the filter piece under the action of the induced draft fan induced draft air entering the body inner cavity.
4. The dust removal and ventilation device for the building heating and ventilation project as claimed in claim 1 or 2, wherein the body is provided with a dust collection mechanism, the dust collection mechanism comprises a sealing assembly and an expansion member, the sealing assembly is connected with the expansion member, and the sealing assembly is used for communicating or dividing the inner cavity of the body.
5. The dust removal and ventilation device for building heating and ventilation engineering according to claim 4, wherein the sealing assembly comprises a first magnet and a second magnet, the first magnet is mounted on the body, the first magnet is electrically connected with the controller, the second magnet is arranged on one side of the first magnet and connected with the telescopic member, and the first magnet is used for adsorbing the second magnet to divide the inner cavity of the body.
6. The dust removal and ventilation device for building heating and ventilation engineering according to claim 1 or 2, wherein the connecting piece is movably connected with a hollow body, an elastic piece is arranged in the hollow body, one end of the elastic piece is connected with the connecting piece, the other end of the elastic piece is connected with the hollow body, and the elastic piece is used for lifting and pulling the connecting piece.
7. The dust removing and ventilating device for heating and ventilating construction as claimed in claim 1, wherein said filtering member has filtering holes for filtering impurities.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110705384.7A CN113587300B (en) | 2021-06-24 | 2021-06-24 | A dust removal ventilation unit for building warm engineering that leads to |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110705384.7A CN113587300B (en) | 2021-06-24 | 2021-06-24 | A dust removal ventilation unit for building warm engineering that leads to |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113587300A true CN113587300A (en) | 2021-11-02 |
| CN113587300B CN113587300B (en) | 2022-09-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110705384.7A Active CN113587300B (en) | 2021-06-24 | 2021-06-24 | A dust removal ventilation unit for building warm engineering that leads to |
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| Country | Link |
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| CN (1) | CN113587300B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006292251A (en) * | 2005-04-08 | 2006-10-26 | Matsushita Electric Ind Co Ltd | Ventilation device |
| CN107376560A (en) * | 2017-07-28 | 2017-11-24 | 成都新力佳科技有限公司 | One kind removes haze device |
| CN109737583A (en) * | 2018-12-22 | 2019-05-10 | 江苏华源建筑设计研究院股份有限公司 | A kind of air conditioning system |
| CN112370878A (en) * | 2020-11-10 | 2021-02-19 | 浙江民生源环保设备有限公司 | Dust removal pipeline filtering device and dust removal method thereof |
| US20210140658A1 (en) * | 2019-11-08 | 2021-05-13 | Samsung Electronics Co., Ltd. | Ventilation apparatus and air conditioner including the same |
-
2021
- 2021-06-24 CN CN202110705384.7A patent/CN113587300B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006292251A (en) * | 2005-04-08 | 2006-10-26 | Matsushita Electric Ind Co Ltd | Ventilation device |
| CN107376560A (en) * | 2017-07-28 | 2017-11-24 | 成都新力佳科技有限公司 | One kind removes haze device |
| CN109737583A (en) * | 2018-12-22 | 2019-05-10 | 江苏华源建筑设计研究院股份有限公司 | A kind of air conditioning system |
| US20210140658A1 (en) * | 2019-11-08 | 2021-05-13 | Samsung Electronics Co., Ltd. | Ventilation apparatus and air conditioner including the same |
| CN112370878A (en) * | 2020-11-10 | 2021-02-19 | 浙江民生源环保设备有限公司 | Dust removal pipeline filtering device and dust removal method thereof |
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| Publication number | Publication date |
|---|---|
| CN113587300B (en) | 2022-09-06 |
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Address after: 100071 Nord tower 1, 128 South Fourth Ring Road West, Fengtai District, Beijing. Patentee after: China Railway Construction Engineering Group Patentee after: China Railway Construction Engineering Group Third Construction Co.,Ltd. Address before: 100071 Nord tower 1, 128 South Fourth Ring Road West, Fengtai District, Beijing. Patentee before: China Railway Construction Engineering Group Patentee before: CHINA RAILWAY CONSTRUCTION ENGINEERING GROUP NORTHERN ENGINEERING CO.,LTD. |