CN112495073A - Low-resistance efficient air filter - Google Patents
Low-resistance efficient air filter Download PDFInfo
- Publication number
- CN112495073A CN112495073A CN202110115213.9A CN202110115213A CN112495073A CN 112495073 A CN112495073 A CN 112495073A CN 202110115213 A CN202110115213 A CN 202110115213A CN 112495073 A CN112495073 A CN 112495073A
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- filter
- box body
- wall
- fixedly connected
- mounting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0039—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with flow guiding by feed or discharge devices
- B01D46/0041—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with flow guiding by feed or discharge devices for feeding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0002—Casings; Housings; Frame constructions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/42—Auxiliary equipment or operation thereof
- B01D46/4236—Reducing noise or vibration emissions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/88—Replacing filter elements
Abstract
The invention discloses a low-resistance high-efficiency air filter which comprises an installation bottom plate, wherein the upper surface of the installation bottom plate is fixedly connected with an installation sleeve, the inner wall of the installation sleeve is connected with a telescopic slide rod in a sliding mode, the top end of the telescopic slide rod is fixedly connected with a filter box body, the filter box body is of a rectangular structure, the inner wall of the filter box body is fixedly connected with connecting rods, the number of the connecting rods is sixteen, every four connecting rods form a group, and the four groups of connecting rods are all arranged on the inner bottom wall, the inner top wall, the inner front wall and the inner rear wall of the filter box body in a rectangular array mode. This high-efficient air cleaner of low resistance through setting up filtration headstock and draught fan, can form the low atmospheric pressure fast in this high-efficient air cleaner's inside, makes its atmospheric pressure difference with the external environment obtain promoting in the short time, and the outside air gets into this high-efficient air cleaner's of low resistance inside with higher speed to the air purification efficiency of this filter has been improved.
Description
Technical Field
The invention relates to the technical field of air filtering devices, in particular to a low-resistance high-efficiency air filter.
Background
High-efficient air cleaner mainly used entrapment particle dust and various suspended solids more than 0.5um, air purifier mainly comprises filter core and casing two parts, and the basic requirement is that filtration efficiency is high, flow resistance is low, can long time continuous use in order to reduce later stage consumptive material cost.
The efficiency of the existing efficient air filter is low, and when the filter element inside the filter is cleaned and replaced, the filter element support frame is difficult to conveniently take out, so that the maintenance time is prolonged, the labor efficiency of workers is reduced, and the production of enterprises is delayed.
Therefore, there is a need for a low resistance, high efficiency air filter.
Disclosure of Invention
The invention aims to provide a low-resistance high-efficiency air filter to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a low-resistance efficient air filter comprises a mounting base plate, wherein the upper surface of the mounting base plate is fixedly connected with a mounting sleeve, the inner wall of the mounting sleeve is slidably connected with a telescopic slide rod, the top end of the telescopic slide rod is fixedly connected with a filter box body, the filter box body is of a rectangular structure, the inner wall of the filter box body is fixedly connected with connecting rods, the connecting rods are sixteen, every four connecting rods are in one group, four groups of the connecting rods are all rectangular arrays and are respectively arranged on the inner bottom wall, the inner top wall, the inner front wall and the inner rear wall of the filter box body, one end, far away from the filter box body, of each connecting rod is fixedly connected with a filtering power box, the front side of the filter box body is provided with threaded holes, the number of the threaded holes is four, the four threaded holes are rectangular arrays and are arranged on the front, the front of filter box is provided with the case lid through first threaded rod, the rectangular channel that link up around the front is seted up to the case lid, the sliding installation groove has all been seted up on the top of case lid and filter box opposite face, the inner wall sliding connection of sliding installation groove has the filter core to support the outrigger, the inside of filter core support outrigger is provided with the filter core and supports the inner tower.
Preferably, mounting plate's lower surface is provided with the arc mounting bar, the quantity of arc mounting bar is two, two the arc mounting bar uses the central line of mounting plate side to set up the lower surface at mounting plate as symmetry axis symmetry, the threaded mounting hole has been seted up on the surface of arc mounting bar, the quantity of threaded mounting hole is a plurality of, a plurality of the threaded mounting hole is equallyd divide for two sets of difference equidistance and sets up on the surface of two arc mounting bars.
Preferably, the quantity of installation sleeve pipe is four, four the installation sleeve pipe is the upper surface of rectangle array setting at mounting plate, four the equal fixedly connected with spacing ring in top of installation sleeve inside wall, the fixed surface of flexible slide bar is connected with circular stopper, circular stopper's external diameter is greater than the internal diameter of spacing ring, installation sleeve pipe's inside is provided with damping spring, damping spring's bottom and installation sleeve pipe's interior diapire fixed connection, damping spring's top and circular stopper's lower fixed surface are connected.
Preferably, cross the filter core and support the outrigger and cross the rectangle frame structure that the outrigger is link up around being, cross the filter core and support the outrigger card and establish the surface at the filter core and support the outrigger, cross the filter core and support the outrigger and cross filter core and support outrigger looks adaptation, the surface threaded connection of crossing the filter core and supporting the outrigger has and is used for supporting the fixed second threaded rod of outrigger with the filter core, the quantity of second threaded rod is four, four the second threaded rod is the surface that the rectangle array set up at the filter core and support the outrigger.
Preferably, the opposite face card that crosses filter core support outrigger and cross filter core support inner tower is equipped with the filter core body, cross the inner wall looks adaptation that the filter core body and cross filter core support inner tower, cross the top fixedly connected with handle that the filter core supported the outrigger, the surface cover of handle is equipped with the antiskid rubber sleeve.
Preferably, the holding tank has been seted up in the front that the filter element supported the outrigger, the inner wall fixedly connected with supporting spring of holding tank, supporting spring's other end fixedly connected with bayonet lock, the surface of bayonet lock is provided with the joint ring with holding tank looks adaptation, spacing hole has been seted up on the surface of case lid, spacing hole and bayonet lock looks adaptation.
Preferably, the filtration headstock is the rectangle tubular structure that link up around for, the inner wall fixedly connected with draught fan of filtration headstock, the air inlet end of draught fan extends to the front of case lid, the back of filter box is provided with out the tuber pipe, the air-out end and the play tuber pipe of draught fan are linked together.
Preferably, an interlayer between the interior of the filter box body and the filtering power box is filled with sound insulation foam.
Advantageous effects
The invention provides a low-resistance high-efficiency air filter which has the following beneficial effects:
1. this high-efficient air cleaner of low resistance through setting up filtration headstock and draught fan, can form the low atmospheric pressure fast in this high-efficient air cleaner's inside, makes its atmospheric pressure difference with the external environment obtain promoting in the short time, and the outside air gets into this high-efficient air cleaner's of low resistance inside with higher speed to the air purification efficiency of this filter has been improved.
2. This high-efficient air cleaner of low resistance, through setting up bayonet lock, supporting spring and handle, utilize the bayonet lock to support the outrigger to filter core and fix, press the bayonet lock, can utilize the handle will filter core and support the outrigger and take out with filter core to reach the purpose of being convenient for change filter core body, need not demolish the case lid, improved the efficiency when safeguarding this filter.
3. This high-efficient air cleaner of low resistance through setting up case lid and first threaded rod, is convenient for maintain filtering the headstock, through setting up flexible slide bar, installation sleeve pipe and damping spring, can reduce the influence that vibrations when this filter used caused the production environment, through setting up the sound insulation foam cotton, the noise that produces when can reducing the device uses is to the influence of environment.
Drawings
FIG. 1 is a schematic front view of the present invention;
FIG. 2 is a schematic right sectional view of the present invention;
FIG. 3 is an enlarged view of the structure at A in FIG. 1;
FIG. 4 is a schematic front sectional view of the installation sleeve;
FIG. 5 is a schematic diagram of a right cross-sectional structure of the filtering power box.
In the figure: the filter comprises a mounting base plate 1, a mounting sleeve 2, a telescopic slide rod 3, a filter box body 4, a connecting rod 5, a filtering power box 6, a first threaded rod 7, a box cover 8, a filter element supporting outer frame 9, a filter element supporting inner frame 10, an arc-shaped mounting bar 11, a threaded mounting hole 12, a limiting ring 13, a circular limiting block 14, a damping spring 15, a second threaded rod 16, a filter element body 17, a lifting handle 18, a supporting spring 19, a clamping pin 20, a clamping ring 21, an induced draft fan 22, an air outlet pipe 23 and sound insulation foam 24.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-5, the present invention provides a technical solution: the utility model provides a low high-efficient air cleaner of resistance, including mounting plate 1, mounting plate 1's lower surface is provided with arc mounting bar 11, and the quantity of arc mounting bar 11 is two, and two arc mounting bars 11 use the central line of mounting plate 1 side to set up at mounting plate 1's lower surface as symmetry axis symmetry, and threaded mounting hole 12 has been seted up on the surface of arc mounting bar 11, and the quantity of threaded mounting hole 12 is a plurality of, and a plurality of threaded mounting hole 12 is equallyd divide and is set up the surface at two arc mounting bars 11 for two sets of equidistance respectively.
The top end of the telescopic slide rod 3 is fixedly connected with a filter box body 4, the filter box body 4 is of a rectangular structure, the inner wall of the filter box body 4 is fixedly connected with connecting rods 5, the number of the connecting rods 5 is sixteen, every four connecting rods 5 form a group, four groups of connecting rods 5 are all in rectangular arrays and are respectively arranged on the inner bottom wall, the inner top wall, the inner front wall and the inner rear wall of the filter box body 4, one end, far away from the filter box body 4, of each connecting rod 5 is fixedly connected with a filtering power box 6, an interlayer between the interior of the filter box body 4 and the filtering power box 6 is filled with sound insulation foam cotton 24, through the arrangement of the sound insulation foam cotton 24, the influence of noise generated when the device is used on the environment can be reduced, the front side of the filter box body 4 is provided with threaded holes, the number of the threaded holes is four, the four, the front of the filter box body 4 is provided with a box cover 8 through a first threaded rod 7, the front of the box cover 8 is provided with a rectangular groove which is through from front to back, and the filter power box 6 is convenient to maintain through the arrangement of the box cover 8 and the first threaded rod 7.
The top ends of opposite surfaces of the box cover 8 and the filter box body 4 are respectively provided with a sliding installation groove, the inner wall of the sliding installation groove is connected with a filter element supporting outer frame 9 in a sliding way, a filter element supporting inner frame 10 is arranged inside the filter element supporting outer frame 9, the filter element supporting outer frame 9 and the filter element supporting inner frame 10 are both of a rectangular frame structure which is through from front to back, the filter element supporting outer frame 9 is clamped on the outer surface of the filter element supporting inner frame 10, the filter element supporting outer frame 9 is matched with the filter element supporting inner frame 10, the surface of the filter element supporting outer frame 9 is in threaded connection with second threaded rods 16 which are used for being fixed with the filter element supporting inner frame 10, the number of the second threaded rods 16 is four, the four second threaded rods 16 are arranged on the surface of the filter element supporting outer frame 9 in a rectangular array manner, a filter element body 17 is clamped on the opposite surface of the filter element supporting outer frame 9 and the filter element supporting inner frame 10, the filter element body, the top end of the filter element supporting outer frame 9 is fixedly connected with a handle 18, and the surface of the handle 18 is sleeved with an anti-skid rubber sleeve.
The holding tank has been seted up in the front that the filter element supported outrigger 9, the inner wall fixedly connected with supporting spring 19 of holding tank, supporting spring 19's other end fixedly connected with bayonet lock 20, bayonet lock 20's surface be provided with the joint ring 21 that holds the tank looks adaptation, spacing hole has been seted up on the surface of case lid 8, spacing hole and bayonet lock 20 looks adaptation, through setting up bayonet lock 20, supporting spring 19 and handle 18, utilize bayonet lock 20 to support outrigger 9 to the filter element and fix, press bayonet lock 20, can utilize handle 18 to support outrigger 9 and the filter element to support inner tower 10 and take out with the filter element, thereby reached the purpose of being convenient for change filter element body 17, need not demolish case lid 8, the efficiency when having improved this filter and having safeguarded.
Filter the rectangle tubular structure that headstock 6 link up for the front and back, the inner wall fixedly connected with draught fan 22 of filtration headstock 6, the air inlet end of draught fan 22 extends to case lid 8's front, the back of filter box 4 is provided with out tuber pipe 23, the air-out end of draught fan 22 is linked together with play tuber pipe 23, through setting up filtration headstock 6 and draught fan 22, can form the low atmospheric pressure fast in this high-efficient air cleaner's inside, make its atmospheric pressure difference with the external environment obtain promoting in the short time, outside air gets into this low-resistance high-efficient air cleaner's inside with higher speed, thereby the air purification efficiency of this filter has been improved.
The working principle is as follows: when the low-resistance high-efficiency air filter is used, low air pressure can be quickly formed in the high-efficiency air filter through the filtering power box 6 and the induced draft fan 22, the air pressure difference between the high-efficiency air filter and the external environment is improved in a short time, the external air enters into the low-resistance high-efficiency air filter in an accelerating way, so that the air purification efficiency of the filter is improved, the filtering core supporting outer frame 9 is fixed through the clamping pin 20, the supporting spring 19 and the lifting handle 18 by utilizing the clamping pin 20, when the filtering core body 17 needs to be replaced, the clamping pin 20 is pressed down, the filtering core supporting outer frame 9 and the filtering core supporting inner frame 10 are taken out by utilizing the lifting handle 18, so that the aim of replacing the filtering core body 17 is fulfilled, the box cover 8 is not required to be detached, the efficiency of maintaining the filter is improved, and the filtering power box 6 is convenient to maintain through the box cover 8 and the first threaded rod 7, through flexible slide bar 3, installation sleeve 2 and damping spring 15, can reduce the influence that vibrations when this filter used caused the production environment, through acoustic foam 24, can reduce the influence of the noise when the device used to the environment.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A low-resistance high-efficiency air filter comprises a mounting base plate (1), and is characterized in that: the upper surface of the mounting base plate (1) is fixedly connected with a mounting sleeve (2), the inner wall of the mounting sleeve (2) is connected with a telescopic slide rod (3) in a sliding manner, the top end of the telescopic slide rod (3) is fixedly connected with a filter box body (4), the filter box body (4) is of a rectangular structure, the inner wall of the filter box body (4) is fixedly connected with connecting rods (5), the number of the connecting rods (5) is sixteen, every four connecting rods (5) form a group, the four groups of the connecting rods (5) are all rectangular arrays and are respectively arranged on the inner bottom wall, the inner top wall, the inner front wall and the inner rear wall of the filter box body (4), one end of each connecting rod (5) far away from the filter box body (4) is fixedly connected with a filtering power box (6), the front surface of the filter box body (4) is, the four threaded holes are arranged on the front surface of the filter box body (4) in a rectangular array mode, the inner walls of the four threaded holes are in threaded connection with first threaded rods (7), the front surface of the filter box body (4) is provided with a box cover (8) through the first threaded rods (7), the front surface of the box cover (8) is provided with rectangular grooves which are communicated front and back, the top ends of opposite surfaces of the box cover (8) and the filter box body (4) are provided with sliding installation grooves, the inner walls of the sliding installation grooves are in sliding connection with a filter element supporting outer frame (9), a filter element supporting inner frame (10) is arranged inside the filter element supporting outer frame (9), the lower surface of the mounting bottom plate (1) is provided with arc-shaped mounting strips (11), the number of the arc-shaped mounting strips (11) is two, and the two arc-shaped mounting strips (11) are symmetrically arranged on the lower surface of the mounting bottom plate (1), threaded mounting hole (12) have been seted up on the surface of arc mounting bar (11), the quantity of threaded mounting hole (12) is a plurality of, a plurality of threaded mounting hole (12) are equallyd divide for two sets of equidistance respectively and set up on the surface of two arc mounting bars (11).
2. A low-drag high efficiency air filter according to claim 1 wherein: the quantity of installing sleeve (2) is four, four installing sleeve (2) is the upper surface that the rectangular array set up at mounting plate (1), four the equal fixedly connected with spacing ring (13) in top of installing sleeve (2) inner wall, the fixed surface of flexible slide bar (3) is connected with circular stopper (14), the external diameter of circular stopper (14) is greater than the internal diameter of spacing ring (13), the inside of installing sleeve (2) is provided with damping spring (15), the bottom of damping spring (15) and the interior diapire fixed connection of installing sleeve (2), the top of damping spring (15) and the lower fixed surface of circular stopper (14) are connected.
3. A low-drag high efficiency air filter according to claim 1 wherein: it supports outrigger (9) and crosses the rectangle frame structure that the core supported inner frame (10) and link up around being, it supports outrigger (9) card to establish at the surface that the core supported inner frame (10) to cross the core, it supports outrigger (9) and crosses the core and supports inner frame (10) looks adaptation to cross the core, the surperficial threaded connection who crosses filter core support outrigger (9) has and is used for supporting fixed second threaded rod (16) of inner frame (10) with crossing the core, the quantity of second threaded rod (16) is four, four second threaded rod (16) are the surface that the rectangle array set up at filter core support outrigger (9).
4. A low-drag high efficiency air filter according to claim 1 wherein: the filter core supports outrigger (9) and the opposite face card of crossing filter core support inner tower (10) and is equipped with filter core body (17), cross filter core body (17) and the inner wall looks adaptation of crossing filter core support inner tower (10), cross the top fixedly connected with handle (18) of filter core support outrigger (9), the surface cover of handle (18) is equipped with the antiskid rubber sleeve.
5. A low-drag high efficiency air filter according to claim 1 wherein: the holding tank has been seted up in the front of filter element support outrigger (9), the inner wall fixedly connected with supporting spring (19) of holding tank, the other end fixedly connected with bayonet lock (20) of supporting spring (19), the surface of bayonet lock (20) is provided with the joint ring (21) with holding tank looks adaptation, spacing hole has been seted up on the surface of case lid (8), spacing hole and bayonet lock (20) looks adaptation.
6. A low-drag high efficiency air filter according to claim 1 wherein: the utility model discloses a filter power case, including filter power case (6), inner wall fixedly connected with draught fan (22) that link up around for, the air inlet end of draught fan (22) extends to the front of case lid (8), the back of filter box (4) is provided with out tuber pipe (23), the air-out end and the play tuber pipe (23) of draught fan (22) are linked together, it is linked together with outside pipe-line system to go out tuber pipe (23).
7. A low-drag high efficiency air filter according to claim 1 wherein: and sound insulation foam (24) is filled in an interlayer between the interior of the filter box body (4) and the filtering power box (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110115213.9A CN112495073B (en) | 2021-01-28 | 2021-01-28 | Low-resistance efficient air filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110115213.9A CN112495073B (en) | 2021-01-28 | 2021-01-28 | Low-resistance efficient air filter |
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| Publication Number | Publication Date |
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| CN112495073A true CN112495073A (en) | 2021-03-16 |
| CN112495073B CN112495073B (en) | 2021-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110115213.9A Active CN112495073B (en) | 2021-01-28 | 2021-01-28 | Low-resistance efficient air filter |
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| CN (1) | CN112495073B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113856365A (en) * | 2021-10-15 | 2021-12-31 | 周宏辉 | A cooling dust removal dehumidification all-in-one for dust-free workshop |
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| US4632681A (en) * | 1985-04-25 | 1986-12-30 | Wheelabrator Corporation Of Canada, Ltd. | Locking apparatus for filter elements |
| JPH1016529A (en) * | 1996-07-08 | 1998-01-20 | Mitsubishi Heavy Ind Ltd | Heat exchanger |
| KR20090047572A (en) * | 2007-11-08 | 2009-05-13 | 삼성전자주식회사 | Air-conditioner |
| CN202509902U (en) * | 2012-03-30 | 2012-10-31 | 胡幸明 | Antitheft padlock |
| CN107715604A (en) * | 2017-11-14 | 2018-02-23 | 南京航空航天大学 | A kind of waste silicon powder harmless treatment device |
| CN210934205U (en) * | 2019-11-12 | 2020-07-07 | 郝智琴 | Filter screen for heating and ventilation equipment |
| CN211082352U (en) * | 2019-12-21 | 2020-07-24 | 广东国基实业有限公司 | Dustproof effectual building ventilating fan |
| CN211486924U (en) * | 2019-07-26 | 2020-09-15 | 无锡市擎德电子科技有限公司 | Air purifier convenient to renew cartridge more |
| CN212141858U (en) * | 2020-01-17 | 2020-12-15 | 上海滨道滤清器有限公司 | Air purification device convenient to change filter plate |
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2021
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Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4632681A (en) * | 1985-04-25 | 1986-12-30 | Wheelabrator Corporation Of Canada, Ltd. | Locking apparatus for filter elements |
| JPH1016529A (en) * | 1996-07-08 | 1998-01-20 | Mitsubishi Heavy Ind Ltd | Heat exchanger |
| KR20090047572A (en) * | 2007-11-08 | 2009-05-13 | 삼성전자주식회사 | Air-conditioner |
| CN202509902U (en) * | 2012-03-30 | 2012-10-31 | 胡幸明 | Antitheft padlock |
| CN107715604A (en) * | 2017-11-14 | 2018-02-23 | 南京航空航天大学 | A kind of waste silicon powder harmless treatment device |
| CN211486924U (en) * | 2019-07-26 | 2020-09-15 | 无锡市擎德电子科技有限公司 | Air purifier convenient to renew cartridge more |
| CN210934205U (en) * | 2019-11-12 | 2020-07-07 | 郝智琴 | Filter screen for heating and ventilation equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113856365A (en) * | 2021-10-15 | 2021-12-31 | 周宏辉 | A cooling dust removal dehumidification all-in-one for dust-free workshop |
| CN113856365B (en) * | 2021-10-15 | 2023-02-07 | 周宏辉 | A cooling dust removal dehumidification all-in-one for dust-free workshop |
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| Publication number | Publication date |
|---|---|
| CN112495073B (en) | 2021-05-07 |
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Effective date of registration: 20230711 Address after: 457000 north of west section of Shengli West Road, Puyang City, Henan Province Patentee after: PUYANG PENGXIN CHEMICAL CO.,LTD. Address before: 261061 No.17 Yongjun Road, Bama Road Industrial Park, Fangzi District, Weifang City, Shandong Province Patentee before: WEIFANG HONGTU ENVIRONMENTAL PROTECTION EQUIPMENT CO.,LTD. Patentee before: PUYANG PENGXIN CHEMICAL CO.,LTD. |