CN106195278A - A kind of high speed cold blower fan magnetic fluid seal device - Google Patents
A kind of high speed cold blower fan magnetic fluid seal device Download PDFInfo
- Publication number
- CN106195278A CN106195278A CN201610780524.6A CN201610780524A CN106195278A CN 106195278 A CN106195278 A CN 106195278A CN 201610780524 A CN201610780524 A CN 201610780524A CN 106195278 A CN106195278 A CN 106195278A
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- China
- Prior art keywords
- ring
- water jacket
- seal receptacle
- cooling
- shaped water
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
- F16J15/43—Sealings between relatively-moving surfaces by means of fluid kept in sealing position by magnetic force
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
The invention discloses a kind of high speed cold blower fan magnetic fluid seal device, including seal receptacle, cooling through oil hole and magnetic conduction axle sleeve, described seal receptacle is fixed in the casing of sealing station by soket head cap screw two, the two ends, inner surface left and right of seal receptacle are connected by soket head cap screw four and soket head cap screw one cooling jacket, described seal receptacle surface is provided with pole shoe one by union (screwed)bonnet (UB, pole shoe two, permanent magnet, ring-shaped water jacket one and ring-shaped water jacket two, it is provided with coolant outlet in one end of seal receptacle, and the other end of seal receptacle is provided with cooling water inlet, the left and right of seal receptacle is respectively arranged at two ends with ring-shaped water jacket two and ring-shaped water jacket one, and ring-shaped water jacket two is connected with cooling jacket with ring-shaped water jacket one.This high speed cold blower fan magnetic fluid seal device, is used for substituting mechanical seal and gland sealed weak point, it is adaptable to sealing station installing space place that is little and that be not allow for dielectric leakage uses, and sealing effectiveness is preferable.
Description
Technical field
The present invention relates to sealing device technical field, be specially a kind of high speed cold blower fan magnetic fluid seal device.
Background technology
There is certain negative pressure near blade root in high speed cold blower fan work seasonal epidemic pathogens body wheel cavity, this makes near impeller
Lubricating oil in the gear tank at position is certain leakage rate because differential pressure action exists, and does not allow oil and conveying gas in actual motion
Wheel cavity in gas medium mix mutually, rely primarily on mechanical seal now and gland sealed mode seal, machine
Tool seals and packing seal has a following deficiency:
Mechanical seal: by a pair or several to being perpendicular to the end face of axle work slip relatively at fluid pressure and the bullet of compensation mechanism
Keeping laminating under power effect, and be equipped with auxiliary seal and reach the gland seal device of Drain Resistance, it is certain that this makes it occupy on using
Space, and air-cooler install seal locational space little, this makes its use be subject to certain restrictions.
Packing seal: be filler is loaded packing cavity after, through gland screw, it is compressed axially, when axle has with filler
During relative motion, due to the plasticity of filler, making it produce radial force, and be in close contact with axle, this makes filler countershaft or axle sleeve
Producing certain abrasion, simultaneously need to often change, sealing effectiveness is bad, causes using inconvenience, to this end, it is proposed that a kind of high
Quickly cooling blower fan magnetic fluid seal device.
Summary of the invention
The technical problem to be solved in the present invention is to overcome existing defect, it is provided that a kind of high speed cold blower fan magnetic liquid is close
Seal apparatus, is used for substituting mechanical seal and gland sealed weak point, it is adaptable to sealing station installing space is little and does not allows
Having the local use of dielectric leakage, sealing effectiveness is preferable, can effectively solve the problem in background technology.
For achieving the above object, the present invention provides following technical scheme: a kind of high speed cold blower fan magnetic fluid sealing fills
Putting, including seal receptacle, cooling through oil hole and magnetic conduction axle sleeve, described seal receptacle is fixed on sealing station by soket head cap screw two
Casing on, the two ends, inner surface left and right of seal receptacle are connected by soket head cap screw four and soket head cap screw one cooling jacket,
Described seal receptacle surface is provided with pole shoe one, pole shoe two, permanent magnet, ring-shaped water jacket one and ring-shaped water jacket two by union (screwed)bonnet (UB,
It is provided with coolant outlet in one end of seal receptacle, and the other end of seal receptacle is provided with cooling water inlet, the two ends, left and right of seal receptacle
It is respectively equipped with ring-shaped water jacket two and ring-shaped water jacket one, and ring-shaped water jacket two is connected with cooling jacket with ring-shaped water jacket one,
Pole shoe two, permanent magnet and pole shoe one, described magnetic conduction axle sleeve from left to right it is sequentially provided with between ring-shaped water jacket two and ring-shaped water jacket one
Being fixed on main shaft by soket head cap screw three, and magnetic conduction axle sleeve rotates with main shaft, described cooling through oil hole runs through
On the left of magnetic conduction axle sleeve, described cooling through oil hole top has cooling oil passage three, cooling oil passage two and the most successively
Cooling oil passage one.
As a preferred technical solution of the present invention, on the right side of described seal receptacle, it is provided with sealing ring two, seal receptacle and cooling
The junction of water jacket is provided with sealing ring four and sealing ring one.
As a preferred technical solution of the present invention, it is close that described seal receptacle has comb near the side of union (screwed)bonnet (UB
Envelope, and the comb of labyrinth seal is rectangular.
As a preferred technical solution of the present invention, the surface of described pole shoe two and pole shoe one all offers annular tooth,
Annular tooth is rectangle or trapezoidal, and the junction of pole shoe two and seal receptacle is provided with sealing ring seven, described pole shoe one and the company of seal receptacle
The place of connecing is provided with sealing ring eight.
As a preferred technical solution of the present invention, described magnetic conduction axle sleeve and main shaft junction are provided with sealing ring three.
As a preferred technical solution of the present invention, the left and right sides, junction of described ring-shaped water jacket two and seal receptacle is divided
It is not provided with sealing ring five and sealing ring six.
As a preferred technical solution of the present invention, the left and right sides, junction of described ring-shaped water jacket one and seal receptacle is divided
It is not provided with sealing ring nine and sealing ring ten.
As a preferred technical solution of the present invention, described ring-shaped water jacket one and seal receptacle junction form water outlet respectively
Mouth and water inlet.
Compared with prior art, the invention has the beneficial effects as follows: this high speed cold blower fan magnetic fluid seal device, cooling
The heat of high-temperature gas can effectively be taken away by the water in water jacket, makes magnetic fluid sealing not affected by high-temperature medium, then gas
Body medium the most excessively arrives magnetic fluid sealing position through comb, can effectively prevent raising magnetic liquid suddenly of gas pressure
Sealing causes and punctures, and makes magnetic fluid sealing not be hit the impact of pressure, and ring-shaped water jacket one and ring-shaped water jacket two can be by magnetic
The heat that liquid seal is distributed is taken away, and prevents the actual effect causing sealing because magnetic liquid operating temperature is too high, magnetic liquid
By the response characteristic to magnetic field, in the magnetic loop that pole shoe one, pole shoe two, permanent magnet and magnetic conduction axle sleeve are formed, absorption is two
In the gap of individual pole shoe and magnetic conduction axle sleeve, play the effect of sealing, effectively gas medium and lubricating oil can be carried out isolation with close
Envelope；In this sealing device, only magnetic conduction axle sleeve rotates with main shaft, and magnetic fluid sealing forms a kind of outer magnetic loops, can
Magnetic liquid is effectively prevented to be thrown out of at high speed；Additionally magnetic conductive axis puts the passage having cooling oil, with main shaft
Turning effort under, cooling oil by seal position most of heat takes away, magnetic fluid sealing position can be played well
Cooling effect, the oil in air-cooler gear tank is all played by final realization with the gas medium in the wheel cavity of conveying gas
Sealing function.
Accompanying drawing explanation
Fig. 1 is present configuration sectional view.
In figure: in 1 cooling jacket, 2 soket head cap screw one, 3 sealing ring one, 4 outlets, 5 seal receptacles, 6 sealing rings two, 7
Hex screw two, 8 coolant outlet, 9 ring-shaped water jacket one, 10 cooling oil passage one, 11 pole shoe one, 12 cooling oil passages two, 13
Permanent magnet, 14 cooling oil passage three, 15 pole shoe two, 16 ring-shaped water jacket two, 17 cooling through oil hole, 18 union (screwed)bonnet (UBs, 19 magnetic conductions
Axle sleeve, 20 labyrinth seals, 21 soket head cap screw three, 22 sealing ring three, 23 soket head cap screw four, 24 sealing ring four, 25 sealing rings
Five, 26 sealing ring six, 27 sealing ring seven, 28 sealing ring eight, 29 sealing ring nine, 30 sealing ring ten, 31 cooling water inlets, 32 water inlets
Mouth, 33 main shafts.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under not making creative work premise
Embodiment, broadly falls into the scope of protection of the invention.
Referring to Fig. 1, the present invention provides a kind of technical scheme: a kind of high speed cold blower fan magnetic fluid seal device, bag
Include seal receptacle 5, cooling through oil hole 17 and magnetic conduction axle sleeve 19, on the right side of seal receptacle 5, be provided with sealing ring 26, seal receptacle 5 and cooling water
The junction of set 1 is provided with sealing ring 4 24 and sealing ring 1, and seal receptacle 5 is fixed on sealing station by soket head cap screw 27
In casing, the two ends, inner surface left and right of seal receptacle 5 are connected by soket head cap screw 4 23 and soket head cap screw 1 cooling jacket
1, seal receptacle 5 surface is provided with pole shoe 1, pole shoe 2 15, permanent magnet 13, ring-shaped water jacket 1 and annular by union (screwed)bonnet (UB 18
Water jacket 2 16, cooling water cooling water inlet 31 on seal receptacle 5 flows into, and flows through cooling jacket 1 and ring-shaped water jacket 2 16 He
Ring-shaped water jacket 1, then flows out from coolant outlet 8, during gap between the cooled water jacket of high temperature gas flow 1 and main shaft, cold
But the heat of high-temperature gas can effectively be taken away by the water in water jacket 1, makes magnetic fluid sealing not affected by high-temperature medium, seals
Seat 5 has labyrinth seal 20 near the side of union (screwed)bonnet (UB 18, and the comb of labyrinth seal 20 is rectangular, and gas medium is through comb
Seal 20 the most excessively to magnetic fluid sealing position, can effectively prevent raising suddenly of gas pressure from magnetic fluid sealing being made
One-tenth punctures, and makes magnetic fluid sealing not be hit the impact of pressure, and ring-shaped water jacket 1 and ring-shaped water jacket 2 16 can be by magnetic liquids
Seal the heat distributed to take away, prevent the inefficacy causing sealing because magnetic liquid operating temperature is too high, at the one of seal receptacle 5
End is provided with coolant outlet 8, and the other end of seal receptacle is provided with cooling water inlet 31, and the left and right of seal receptacle 5 is respectively arranged at two ends with
Ring-shaped water jacket 2 16 and ring-shaped water jacket 1, the junction of ring-shaped water jacket 1 and seal receptacle 5 is respectively arranged on the left side and the right side sealing ring
9 29 and sealing ring 10, and ring-shaped water jacket 2 16 is connected with cooling jacket 1 with ring-shaped water jacket 1, ring-shaped water jacket 1 He
Seal receptacle 5 junction forms outlet 4 and water inlet 32 respectively, the left and right sides, junction of ring-shaped water jacket 2 16 and seal receptacle 5
It is respectively equipped with sealing ring 5 25 and sealing ring 6 26, sets the most successively between ring-shaped water jacket 2 16 and ring-shaped water jacket 1
Having pole shoe 2 15, permanent magnet 13 and pole shoe 1, the surface of pole shoe 2 15 and pole shoe 1 all offers annular tooth, and annular tooth is
Rectangle or trapezoidal, the junction of pole shoe 2 15 and seal receptacle 5 is provided with sealing ring 7 27, and magnetic liquid is by the response spy to magnetic field
Property, in the magnetic loop that pole shoe 1, pole shoe 2 15, permanent magnet 13 and magnetic conduction axle sleeve 19 are formed, absorption is at pole shoe 1, pole shoe
2 15 and magnetic conduction axle sleeve 19 gap in, play the effect of sealing, effectively liquids and gases medium can be isolated and seal, pole
The junction of boots 1 and seal receptacle 5 is provided with sealing ring 8 28, and magnetic conduction axle sleeve 19 is fixed on main shaft by soket head cap screw 3 21
On 33, magnetic conduction axle sleeve 19 and main shaft 33 junction are provided with sealing ring 3 22, and magnetic conduction axle sleeve 19 rotates with main shaft 33, cold
But through oil hole 17 runs through on the left of magnetic conduction axle sleeve 19, and cooling through oil hole 17 top has cooling oil passage three the most successively
14, cooling oil passage 2 12 and cooling oil passage 1, in this sealing device, only magnetic conduction axle sleeve 19 is with 33 turns of main shaft
Dynamic, magnetic fluid sealing forms a kind of outer magnetic loops, can effectively prevent magnetic liquid to be thrown out of at high speed, additionally magnetic conduction
Having the passage of cooling oil on axle sleeve 19, under the turning effort with main shaft 33, cooling oil will seal the major part at position
Heat is taken away, and magnetic fluid sealing position can be played good cooling effect, finally realizes in air-cooler gear tank
Oil all plays isolation and sealing function with the gas medium in the wheel cavity of conveying gas.
In use: cooling water cooling water inlet 31 on seal receptacle 5 flows into, cooling jacket 1 and annular water are flowed through
Overlap 2 16 and ring-shaped water jacket 1, then flow out from coolant outlet 8, between the cooled water jacket of high temperature gas flow 1 and main shaft between
During gap, the heat of high-temperature gas can effectively be taken away by the water in cooling jacket 1, makes magnetic fluid sealing not by the shadow of high-temperature medium
Ringing, then gas medium is through labyrinth seal 20 the most excessively to magnetic fluid sealing position, can effectively prevent the prominent of gas pressure
So raise magnetic fluid sealing is caused and puncture, make magnetic fluid sealing not be hit the impact of pressure, ring-shaped water jacket 1 and ring
The heat that magnetic fluid sealing is distributed can be taken away by shape water jacket 2 16, prevents from causing close because magnetic liquid operating temperature is too high
The actual effect of envelope, wherein cooling jacket 1 is fixed on seal receptacle 5 by soket head cap screw 1 and soket head cap screw 4 23, pole shoe one
11, pole shoe 2 15, permanent magnet 13, ring-shaped water jacket 1 and ring-shaped water jacket 2 16 are fixed on seal receptacle 5 by union (screwed)bonnet (UB 18；
Magnetic liquid is by the response characteristic to magnetic field, at the magnetic that pole shoe 1, pole shoe 2 15, permanent magnet 13 and magnetic conduction axle sleeve 19 are formed
In loop, absorption, in pole shoe 1, pole shoe 2 15 and magnetic conduction axle sleeve 19 gap, plays the effect of sealing, can be effectively to liquid
Carry out isolating and sealing with gas medium；In this sealing device, only magnetic conduction axle sleeve 19 rotates with main shaft 33, magnetic liquid
Seal and form a kind of outer magnetic loops, can effectively prevent magnetic liquid to be thrown out of at high speed；Additionally open on magnetic conduction axle sleeve 19
Having the passage of cooling oil, under the turning effort with main shaft 33, the most of heat sealing position is taken away by cooling oil, can
Magnetic fluid sealing position is played good cooling effect, and final realization is to the oil in air-cooler gear tank and conveying gas
Wheel cavity in gas medium all play isolation and sealing function.
Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, permissible
Understand and these embodiments can be carried out multiple change without departing from the principles and spirit of the present invention, revise, replace
And modification, the scope of the present invention be defined by the appended.
Claims (8)
1. a high speed cold blower fan magnetic fluid seal device, including seal receptacle, cooling through oil hole and magnetic conduction axle sleeve, it is special
Levy and be: described seal receptacle is fixed in the casing of sealing station by soket head cap screw two, about the inner surface of seal receptacle two
Holding to be connected by soket head cap screw four and soket head cap screw one has cooling jacket, described seal receptacle surface to be installed by union (screwed)bonnet (UB
There are pole shoe one, pole shoe two, permanent magnet, ring-shaped water jacket one and ring-shaped water jacket two, are provided with coolant outlet in one end of seal receptacle, and
The other end of seal receptacle is provided with cooling water inlet, and the left and right of seal receptacle is respectively arranged at two ends with ring-shaped water jacket two and ring-shaped water jacket one,
And ring-shaped water jacket two is connected with cooling jacket with ring-shaped water jacket one, between ring-shaped water jacket two and ring-shaped water jacket one from a left side to
The right side is sequentially provided with pole shoe two, permanent magnet and pole shoe one, and described magnetic conduction axle sleeve is fixed on main shaft by soket head cap screw three, and
Magnetic conduction axle sleeve rotates with main shaft, and described cooling through oil hole runs through on the left of magnetic conduction axle sleeve, described cooling through oil hole top
Have cooling oil passage three, cooling oil passage two and cooling oil passage one the most successively.
A kind of high speed cold blower fan magnetic fluid seal device the most according to claim 1, it is characterised in that: described sealing
The junction being provided with sealing ring two, seal receptacle and cooling jacket on the right side of Zuo is provided with sealing ring four and sealing ring one.
A kind of high speed cold blower fan magnetic fluid seal device the most according to claim 1, it is characterised in that: described sealing
The side seating against nearly union (screwed)bonnet (UB has labyrinth seal, and the comb of labyrinth seal is rectangular.
A kind of high speed cold blower fan magnetic fluid seal device the most according to claim 1, it is characterised in that: described pole shoe
Two and the surface of pole shoe one all offer annular tooth, annular tooth is rectangle or trapezoidal, and the junction of pole shoe two and seal receptacle is provided with
Sealing ring seven, the junction of described pole shoe one and seal receptacle is provided with sealing ring eight.
A kind of high speed cold blower fan magnetic fluid seal device the most according to claim 1, it is characterised in that: described magnetic conduction
Axle sleeve and main shaft junction are provided with sealing ring three.
A kind of high speed cold blower fan magnetic fluid seal device the most according to claim 1, it is characterised in that: described annular
The junction of water jacket two and seal receptacle is respectively arranged on the left side and the right side sealing ring five and sealing ring six.
A kind of high speed cold blower fan magnetic fluid seal device the most according to claim 1, it is characterised in that: described annular
The junction of water jacket one and seal receptacle is respectively arranged on the left side and the right side sealing ring nine and sealing ring ten.
A kind of high speed cold blower fan magnetic fluid seal device the most according to claim 1, it is characterised in that: described annular
Water jacket one and seal receptacle junction form outlet and water inlet respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610780524.6A CN106195278B (en) | 2016-08-30 | 2016-08-30 | A kind of high speed air-cooler magnetic fluid seal device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610780524.6A CN106195278B (en) | 2016-08-30 | 2016-08-30 | A kind of high speed air-cooler magnetic fluid seal device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106195278A true CN106195278A (en) | 2016-12-07 |
| CN106195278B CN106195278B (en) | 2017-11-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610780524.6A Active CN106195278B (en) | 2016-08-30 | 2016-08-30 | A kind of high speed air-cooler magnetic fluid seal device |
Country Status (1)
| Country | Link |
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| CN (1) | CN106195278B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108105146A (en) * | 2018-01-30 | 2018-06-01 | 邢天宜 | Using the system of the wet sealing cut-out wind turbine gas material leakage with liquid barrier |
| CN111457100A (en) * | 2020-04-24 | 2020-07-28 | 中国矿业大学 | Axial and radial combined type magnetic liquid sealing structure |
| CN112178202A (en) * | 2020-10-19 | 2021-01-05 | 清华大学 | Magnetic liquid sealing device for sealing dust |
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| JPH04321881A (en) * | 1991-04-23 | 1992-11-11 | Tokin Corp | Magnetic seal rotation introducing machine |
| CN200943707Y (en) * | 2006-06-16 | 2007-09-05 | 北京交通大学 | High temperature magnetic liquid seal water-cooling device |
| CN201354756Y (en) * | 2009-01-09 | 2009-12-02 | 龚正勤 | Magnetic fluid shaft seal |
| CN103574041A (en) * | 2013-11-08 | 2014-02-12 | 北京交通大学 | Cooling groove and centrifugal combined magnetic liquid rotating and sealing device |
| CN104197024A (en) * | 2014-08-06 | 2014-12-10 | 北京交通大学 | Peristaltic pumping circulation cooling type magnetic liquid sealing device |
| CN104500751A (en) * | 2014-12-12 | 2015-04-08 | 北京交通大学 | High temperature-resisting magnetic liquid sealing device |
| CN206234364U (en) * | 2016-08-30 | 2017-06-09 | 自贡兆强环保科技股份有限公司 | A kind of high speed air-cooler magnetic fluid seal device |
-
2016
- 2016-08-30 CN CN201610780524.6A patent/CN106195278B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04321881A (en) * | 1991-04-23 | 1992-11-11 | Tokin Corp | Magnetic seal rotation introducing machine |
| CN200943707Y (en) * | 2006-06-16 | 2007-09-05 | 北京交通大学 | High temperature magnetic liquid seal water-cooling device |
| CN201354756Y (en) * | 2009-01-09 | 2009-12-02 | 龚正勤 | Magnetic fluid shaft seal |
| CN103574041A (en) * | 2013-11-08 | 2014-02-12 | 北京交通大学 | Cooling groove and centrifugal combined magnetic liquid rotating and sealing device |
| CN104197024A (en) * | 2014-08-06 | 2014-12-10 | 北京交通大学 | Peristaltic pumping circulation cooling type magnetic liquid sealing device |
| CN104500751A (en) * | 2014-12-12 | 2015-04-08 | 北京交通大学 | High temperature-resisting magnetic liquid sealing device |
| CN206234364U (en) * | 2016-08-30 | 2017-06-09 | 自贡兆强环保科技股份有限公司 | A kind of high speed air-cooler magnetic fluid seal device |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108105146A (en) * | 2018-01-30 | 2018-06-01 | 邢天宜 | Using the system of the wet sealing cut-out wind turbine gas material leakage with liquid barrier |
| CN108105146B (en) * | 2018-01-30 | 2023-12-29 | 天津长瑞大通流体控制系统有限公司 | System for cutting off leakage of fan gas material by adopting wet seal with barrier liquid |
| CN111457100A (en) * | 2020-04-24 | 2020-07-28 | 中国矿业大学 | Axial and radial combined type magnetic liquid sealing structure |
| CN111457100B (en) * | 2020-04-24 | 2021-02-19 | 中国矿业大学 | Axial and radial combined type magnetic liquid sealing structure |
| CN112178202A (en) * | 2020-10-19 | 2021-01-05 | 清华大学 | Magnetic liquid sealing device for sealing dust |
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| Publication number | Publication date |
|---|---|
| CN106195278B (en) | 2017-11-28 |
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Denomination of invention: Magnetic liquid sealing device for high-speed air cooler Effective date of registration: 20200424 Granted publication date: 20171128 Pledgee: Zigong industrial and Credit Enterprise Investment Co., Ltd. Pledgor: ZIGONG ZHAOQIANG ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. Registration number: Y2020510000038 |