CN205298869U - Empty glue mixing pipe of R744 - Google Patents
Empty glue mixing pipe of R744 Download PDFInfo
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- CN205298869U CN205298869U CN201521065476.XU CN201521065476U CN205298869U CN 205298869 U CN205298869 U CN 205298869U CN 201521065476 U CN201521065476 U CN 201521065476U CN 205298869 U CN205298869 U CN 205298869U
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Abstract
Regard as the barrier layer with nylon - polyvinyl alcohol - nylon three -layer composite material among the empty glue mixing pipe of R744, the utility model discloses in the barrier layer structure of this kind of three -layer composite material, can reduce empty glue mixing pipe is to the permeability of R744 working medium. Especially this application polyvinyl alcohol layer in the barrier layer has a fine impervious permeability, therefore with the compound back of this kind of material and nylon, can be when improving the separation effect, can also improve the mechanical strength of barrier layer. Simultaneously, because nylon layer can have fine bond properties with the mesoglea, also can improve the mechanical properties of the overall structure's of rubber tube uniformity and the empty glue mixing of rubber tube pipe.
Description
Technical field
This utility model relates to air conditioner rubber pipe field, in particular to a kind of R744 air conditioner rubber pipe.
Background technology
Cold-producing medium is the working media completing kind of refrigeration cycle in process of refrigerastion, and the cold-producing medium used by early stage air-conditioning and refrigerator etc. is halogenated hydrocarbons. But, the discharge of this halogenated hydrocarbons cold-producing medium can destroy atmospheric ozone layer, and the destructiveness of ozone layer is represented by cold-producing medium by the latent value (Ozonedepletionpotential is called for short ODP) that damages the ozone layer. Simultaneously, these halogenated hydrocarbons are also one of inducements causing global warming, because the discharge of halogenated hydrocarbons cold-producing medium can cause greenhouse effect, and then cause global warming, its influence degree global warming potential (Globalwarmingpotential is called for short GWP) represents.
Before Montreal Agreement bookmark is ordered, automotive air-conditioning system is mainly using CFC12 as cold-producing medium, but the ODP value of this cold-producing medium is higher, thus, according to Montreal Agreement book, CFC12 is that one-level is limited cold-producing medium.
Replacing CFC12 to find new coolant, air conditioner industry is made that and studies widely, it is desirable to develop the Biological process that ODP value is zero. In these researchs, the cold-producing medium HFC134a of E.I.Du Pont Company's exploitation is successfully applied in refrigeration industry. Due to the not chloride atom of HFC134a, and having good security performance, meanwhile, the physical property of this cold-producing medium is also closer to traditional CFC12 cold-producing medium, thus the remodeling of refrigeration system is also easier. Further, the heat transfer character of HFC134a is also more excellent than CFC12, thus, in use, the consumption of HFC134a is also less, suitableeer as air conditioner refrigerating medium.
But, according to European Union already by the requirement of fluorine-containing greenhouse-gas control regulation, from 11 days January in 2011, the air conditioning for automobiles forbidding new production is used the GWP value cold-producing medium more than 150 by European Union, the GWP value of the HFC134a cold-producing medium owing to having used in a large number now is 1300, so will be prohibited from using. Further, European Union specifies, from 1 day January in 2017, will forbid that all air conditioning for automobiles use the GWP value cold-producing medium more than 150. Thus, air conditioning for automobiles uses the cold-producing medium of low GWP value will become trend and certainty.
The material that carbon dioxide (R744) is naturally-occurring, its ODP=0, GWP=1. Meanwhile, carbon dioxide wide material sources, with low cost, and safety non-toxic; Same properties of carbon dioxide is stable, incombustible, thus adapts to various lubricating oil conventional machinery component materials. Even if at high temperature, carbon dioxide produces harmful gas without decomposing. Simultaneously as the evaporation latent heat of carbon dioxide is relatively big, refrigerating effect per unit swept volume is at a relatively high, so the compressor using carbon dioxide to be refrigeration working medium and part dimension thereof are less. Further, the higher K=1.30 of adiabatic exponent of the compressor using carbon dioxide to be refrigeration working medium, compressor pressure ratio is about 2.5-3.0, lower than other refrigeration systems, volumetric efficiency is relatively larger, close to optimum level, thus having very big development potentiality, carbon dioxide also progressively obtains accreditation as the performance of cold-producing medium.
Research and development are applicable to the air conditioner rubber pipe of carbon dioxide coolant further, also just become the direction of the main research of present stage air conditioner rubber pipe.
Existing air-conditioner pipe structure is barrier layer, mesoglea, polyester line enhancement layer and outer glue-line from inside to outside. But, owing in existing air conditioner rubber pipe, its barrier layer is only one layer of pure nylon, thus and R744 hypotonicity requirement cannot be met, it is easy to cause infiltration and the leakage of CO 2 medium. Thus, although existing air conditioner rubber pipe can meet the medium instructions for uses such as R134a, but cannot meet the needs of the novel environment-friendly refrigerant air conditioning systems such as novel refrigerant R744 medium.
In view of this, special proposition this utility model.
Utility model content
First purpose of the present utility model is in that to provide a kind of R744 air conditioner rubber pipe, cannot meet the technical problem of novel refrigerant R744 medium needs solving air conditioner rubber pipe described in prior art. It is low that air conditioner rubber pipe provided by the utility model has permeability, sebific duct burst pressure advantages of higher.
In order to realize above-mentioned purpose of the present utility model, spy by the following technical solutions:
R744 air conditioner rubber pipe described in the utility model, described sebific duct is followed successively by barrier layer, mesoglea, enhancement layer and outer glue-line from the inside to the outside. Wherein, described barrier layer is nylon-polyvinyl alcohol-nylon 3-layer composite material.
Being only with the barrier layer in existing air conditioner rubber pipe compared with single nylon material, the barrier layer of air conditioner rubber pipe described in the utility model is the 3-layer composite material layer of nylon-polyvinyl alcohol-nylon. The barrier layer structure of this 3-layer composite material in this utility model, greatly reduces the described air conditioner rubber pipe permeability to R744 working medium. Particularly the polyvinyl alcohol layer in herein described 3-layer composite material barrier layer has good permeability resistance, thus can while improving air conditioner rubber pipe permeation barrier effect, additionally it is possible to improve the mechanical strength of barrier layer. Simultaneously as nylon layer can have good bond properties with mesoglea, it is also possible to improve the integrally-built concordance of sebific duct described in the utility model and the mechanical performance of sebific duct.
Optionally, in this utility model, the material of the two-layer nylon layer in 3-layer composite material layer is identical.
Optionally, in this utility model, the material of the two-layer nylon layer in three layers composite bed is different.
Optionally, in this utility model, the composite layer of one or more in nylon layer respectively PA66, PA6, PA610, PA1010, MCPA, PACT in described barrier layer; Preferably, in this utility model, the composite layer of one or more in nylon layer respectively PA66, PA610 in described barrier layer.
Optionally, in this utility model, in described barrier layer, polyvinyl alcohol layer is the composite layer of one or more in PVA200, PVA400, PVA600, PVA800, PVA1000, PVA1450, PVA2000, PVA3000, PVA3350, PVA4000, PVA6000, PVA8000; Preferably, in this utility model, in described barrier layer, polyvinyl alcohol layer is the composite layer of one or more in PVA1000, PVA1450, PVA2000.
In this utility model, by selecting further and optimizing polyvinyl alcohol layer, improve the permeability resistance of air conditioner rubber pipe.
Optionally, in this utility model, the thickness of described barrier layer is 0.3-1.2mm.
Optionally, in barrier layer described in the utility model, described two-layer nylon layer thickness is all identical with the thickness of described polyvinyl alcohol layer.
Optionally, in barrier layer described in the utility model, the thickness of described two-layer nylon layer thickness and described polyvinyl alcohol layer is different from.
Optionally, in this utility model, in described three layers compound barrier layer, thickness respectively 0.1-0.4mm, 0.1-0.4mm, 0.1-0.4mm of nylon layer-polyvinyl alcohol layer-nylon layer from the inner to the outer; Preferably, thickness respectively 0.2-0.3mm, 0.2-0.3mm, 0.2-0.3mm of nylon layer-polyvinyl alcohol layer-nylon layer from the inside to the outside.
Optionally, in this utility model, described mesoglea is EP rubbers layer.
In this utility model, in described mesoglea, EP rubbers has good tear-resistant performance and morphotropism, it is thus possible to improve the overall mechanical properties of described air conditioner rubber pipe. Meanwhile, EP rubbers layer has good bond properties with the nylon outer layer in barrier layer and enhancement layer, therefore, it is possible to improve the integrally-built concordance of described sebific duct further, improves the mechanical performance of sebific duct further.
Optionally, in this utility model, described sebific duct mesoglea ethylene-propylene-diene monomer glue-line is the mixture layer of one or more in Mitsui EPDM, Korea S SKEPDM, Du Pont DuPontEPDM; Preferably, herein described ethylene-propylene-diene monomer glue-line is the mixture layer of one or more in Mitsui EPDM3045, EPDM3062E, EPDM3070, EPDM3072E, EPDM3090E, EPDM3091, EPDM3095 or Korea S SKEPDMS501, EPDMS505, EPDMS512, EPDMS600;
In this utility model, owing to the ethylene propylene diene rubber to have excellent properties is as raw material mesoglea material, so that the sebific duct that the application prepares further can have good hot tear crack performance and thermal deformation behavior.
Optionally, in this utility model, the thickness of described mesoglea is 0.8-1.5mm; Preferably, in this utility model, the thickness of described mesoglea is 1.0-1.4mm; It is furthermore preferred that in this utility model, the thickness of described mesoglea is 1.1-1.2mm.
In this utility model, adjustment by centering bondline thickness, so that mesoglea can either play bonding and strengthen the effect of mechanical strength, it is not suitable in the automobile air-conditioning refrigeration device that space is less without air conditioner rubber pipe that cause because mesoglea thickness is blocked up.
Optionally, in this utility model, described enhancement layer is aramid layers.
In this utility model, using the higher aramid fiber of mechanical strength as enhancement layer, it is possible to improve the mechanical performance that described air conditioner rubber pipe is overall, improve the burst pressure of sebific duct.
Optionally, in this utility model, described enhancement layer thickness is 0.4-0.8mm;Preferably, in this utility model, the thickness of described enhancement layer is 0.5-0.7mm; It is furthermore preferred that in this utility model, the thickness of described enhancement layer is 0.6mm.
In this utility model, by the adjustment to enhancement layer thickness, so that enhancement layer can either play bonding and strengthen the effect of mechanical strength, it is not suitable in the automobile air-conditioning refrigeration device that space is less without air conditioner rubber pipe that cause because enhancement layer thickness is blocked up.
Optionally, in this utility model, described outer glue line material is EP rubbers material.
In this utility model, in described outer glue-line, EP rubbers material has good tear-resistant performance and morphotropism, it is thus possible to improve the overall mechanical properties of described air conditioner rubber pipe. Meanwhile, EP rubbers layer and enhancement layer have good bond properties, therefore, it is possible to improve the integrally-built concordance of described sebific duct further, improve the mechanical performance of sebific duct further.
Optionally, in this utility model, the outer glue line material ethylene propylene diene rubber of described sebific duct is the combination of one or more in Mitsui EPDM, Korea S SKEPDM, Du Pont DuPontEPDM; Preferably, herein described ethylene propylene diene rubber is the mixture of one or more in Mitsui EPDM3045, EPDM3062E, EPDM3070, EPDM3072E, EPDM3090E, EPDM3091, EPDM3095 or Korea S SKEPDMS501, EPDMS505, EPDMS512, EPDMS600.
Optionally, in this utility model, described outer glue line material is EP rubbers and polyolefin elastic composite material.
In this utility model, in described outer glue-line, EP rubbers and polyolefin elastic composite material have good tear-resistant performance and morphotropism, compared to single EP rubbers, the mechanical performance of this composite is better, thus also being able to improve further the overall mechanical properties of described air conditioner rubber pipe. Meanwhile, the outer glue-line of composite has good bond properties with enhancement layer, therefore, it is possible to improve the integrally-built concordance of described sebific duct further, improves the mechanical performance of sebific duct further.
Optionally, herein described EP rubbers is with polyolefin elastic composite material, and described ethylene propylene diene rubber can be the combination of one or more in Mitsui EPDM, Korea S SKEPDM, Du Pont DuPontEPDM; Preferably, herein described ethylene propylene diene rubber is the mixture of one or more in Mitsui EPDM3045, EPDM3062E, EPDM3070, EPDM3072E, EPDM3090E, EPDM3091, EPDM3095 or Korea S SKEPDMS501, EPDMS505, EPDMS512, EPDMS600.
Optionally, herein described EP rubbers is with polyolefin elastic composite material, and described polyolefin elastomer can be Du Pont POE8999, POE8150, POE8842, POE8200, POE7467 or three well DF610, DF710, DF740, DF810 or LGLC170, LC670, LC175.
Optionally, in this utility model, the thickness of described outer glue-line is 0.8-1.5mm; Preferably, in this utility model, the thickness of described outer glue-line is 1.0-1.4mm; It is furthermore preferred that in this utility model, the thickness of described outer glue-line is 1.1-1.2mm.
Compared with prior art, the beneficial effects of the utility model are:
(1) in this utility model, by air conditioner rubber pipe using nylon-polyvinyl alcohol-nylon 3-layer composite material as barrier layer, it is possible to reduce the permeability to carbon dioxide working medium of air conditioner rubber pipe;
(2) in this utility model, using aramid fiber as enhancement layer material, it is possible to the overall mechanical performance of reinforcing hose, the burst pressure of sebific duct is improved;
(3), in this utility model, using EP rubbers or EP rubbers and polyolefin elastomer mixed rubber as mesoglea and outer glue line material, it is possible to increase the cohesive between sebific duct layers of material, and then the globality of sebific duct is improved; Meanwhile, EP rubbers or EP rubbers and polyolefin elastomer mixed rubber material also are able to improve the mechanical performance of sebific duct.
Accompanying drawing explanation
In order to be illustrated more clearly that this utility model detailed description of the invention or technical scheme of the prior art, the accompanying drawing used required in detailed description of the invention or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is embodiments more of the present utility model, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is R744 air conditioner rubber pipe schematic diagram provided by the utility model; Described sebific duct is followed successively by internal layer by outer layer:
1-outer glue-line, 2-enhancement Layer, 3-mesoglea, 4-barrier layer outer layer nylon layer, 5-barrier layer middle level polyvinyl alcohol layer, 6-barrier layer internal layer nylon layer.
Detailed description of the invention
For making the purpose of this utility model, technical scheme and advantage clearly; the technical solution of the utility model will be carried out clear, complete description below; based on the detailed description of the invention in this utility model; other embodiments all that those of ordinary skill in the art are obtained under the premise not making creative work, broadly fall into the scope that this utility model is protected.
In description of the present utility model, it should be noted that, orientation or the position relationship of the instruction such as term " " center ", " on ", D score, "left", "right", " vertically ", " level ", " interior ", " outward " be based on orientation shown in the drawings or position relationship; be for only for ease of description this utility model and simplifying and describe; rather than instruction or imply indication device or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to restriction of the present utility model. Additionally, term " first ", " second ", " the 3rd " are only for descriptive purposes, and it is not intended that indicate or hint relative importance.
In description of the present utility model, it is necessary to explanation, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, for instance, it is possible to it is fixing connection, it is also possible to be removably connect, or connect integratedly; Can be mechanically connected, it is also possible to be electrical connection; Can be joined directly together, it is also possible to be indirectly connected to by intermediary, it is possible to be the connection of two element internals. For the ordinary skill in the art, it is possible to concrete condition understands above-mentioned term concrete meaning in this utility model.
Refer to Fig. 1, R477 air conditioner rubber pipe provided by the utility model, including: outer glue-line 1, enhancement Layer 2, mesoglea 3, barrier layer outer layer nylon layer 4, barrier layer middle level polyvinyl alcohol layer 5, barrier layer internal layer nylon layer 6.
Wherein, described outer glue-line to be ethylene-propylene-diene monomer glue-line, enhancement Layer be aramid layers, mesoglea are ethylene-propylene-diene monomer glue-line.
In another program of the present utility model, this R477 air conditioner rubber pipe includes: outer glue-line 1, enhancement Layer 2, mesoglea 3, barrier layer outer layer nylon layer 4, barrier layer middle level polyvinyl alcohol layer 5, barrier layer internal layer nylon layer 6.
Wherein, described outer glue-line 1 be ethylene propylene diene rubber with polyolefin elastomer mixed rubber layer, enhancement Layer 2 be aramid layers, mesoglea 3 be ethylene-propylene-diene monomer glue-line.
Refer to Fig. 1, in yet another aspect of the present utility model, R477 air conditioner rubber pipe includes outer glue-line 1, enhancement Layer 2, mesoglea 3, barrier layer outer layer nylon layer 4, barrier layer middle level polyvinyl alcohol layer 5, barrier layer internal layer nylon layer 6.
Wherein, described outer glue-line 1 be ethylene propylene diene rubber with polyolefin elastomer mixed rubber layer, enhancement Layer 2 be aramid layers, mesoglea 3 be ethylene-propylene-diene monomer glue-line.
In addition, refer to Fig. 1, it is preferred that scheme in, R477 air conditioner rubber pipe provided by the utility model includes: outer glue-line 1, enhancement Layer 2, mesoglea 3, barrier layer outer layer nylon layer 4, barrier layer middle level polyvinyl alcohol layer 5, barrier layer internal layer nylon layer 6.
Wherein, described outer glue-line 1 be ethylene propylene diene rubber with polyolefin elastomer mixed rubber layer, enhancement Layer 2 be aramid layers, mesoglea 3 be ethylene-propylene-diene monomer glue-line, barrier layer outer layer nylon layer 4 be nylon66 fiber layer, barrier layer middle level polyvinyl alcohol layer 5 be PVA1450 layer, barrier layer internal layer nylon layer 6 be nylon66 fiber layer.
Finally, in another preferred technical scheme provided by the utility model, R477 air conditioner rubber pipe, including outer glue-line 1, enhancement Layer 2, mesoglea 3, barrier layer outer layer nylon layer 4, barrier layer middle level polyvinyl alcohol layer 5, barrier layer internal layer nylon layer 6.
Wherein, described outer glue-line 1 be ethylene propylene diene rubber with polyolefin elastomer mixed rubber layer, enhancement Layer 2 be aramid layers, mesoglea 3 be ethylene-propylene-diene monomer glue-line, barrier layer outer layer nylon layer 4 be NYLON610 layer, barrier layer middle level polyvinyl alcohol layer 5 be PVA1000 layer, barrier layer internal layer nylon layer 6 be NYLON610 layer.
Its China and foreign countries' glue-line 1 thickness is 1.5mm, enhancement Layer 2 thickness to be 0.6mm, mesoglea 3 thickness be 1.2mm, barrier layer outer layer nylon layer 4 thickness are 0.2mm, barrier layer middle level polyvinyl alcohol layer 5 thickness be 0.2mm, barrier layer internal layer nylon layer 6 thickness is 0.2mm.
Further, the preparation method step of R744 air-conditioner pipe described in the utility model is:
A) the plastic extruder extrusion being equipped with complex extruder head is adopted to be followed successively by the barrier layer of nylon-polyvinyl alcohol-nylon material from the inside to the outside;
B) barrier layer of preparation in step a is introduced in Rubber Extruder, at barrier layer surface extrusion cladding mesoglea;
C) it follows that the compound rubber pipe prepared in b step is introduced in braider, at one layer of aramid line enhancement layer of mesoglea surface weave;
D) last, sebific duct after the establishment prepared in step c is introduced in Rubber Extruder, thus at the outer glue-line of aramid fiber litzendraht wire Surface coating, obtaining described air-conditioning rubber tube.
R744 air conditioner rubber pipe described in the utility model, by air conditioner rubber pipe using nylon-polyvinyl alcohol-nylon 3-layer composite material as barrier layer, it is possible to reduce the permeability to carbon dioxide working medium of air conditioner rubber pipe; Meanwhile, sebific duct described in the utility model is using aramid fiber as enhancement layer material, it is possible to the overall mechanical performance of reinforcing hose, improves the burst pressure of sebific duct further. Same, sebific duct described in the utility model, using EP rubbers or EP rubbers and polyolefin elastomer mixed rubber as mesoglea and outer glue line material, it is thus possible to improve the cohesive between sebific duct layers of material and then the overall mechanical properties of raising sebific duct.
Although illustrate and describing this utility model with specific embodiment, however it will be appreciated that may be made that when without departing substantially from spirit and scope of the present utility model many other change and amendment. It is, therefore, intended that include all such changes and modifications belonging within the scope of this utility model in the following claims.
Claims (10)
1. a R744 air conditioner rubber pipe, it is characterised in that described sebific duct is followed successively by barrier layer, mesoglea, enhancement layer and outer glue-line from the inner to the outer;
Wherein, described barrier layer is nylon-polyvinyl alcohol-nylon 3-layer composite material layer.
2. air conditioner rubber pipe according to claim 1, it is characterized in that, described barrier layer is the composite layer of one or more in PVA200, PVA400, PVA600, PVA800, PVA1000, PVA1450, PVA2000, PVA3000, PVA3350, PVA4000, PVA6000, PVA8000.
3. air conditioner rubber pipe according to claim 1, it is characterised in that described mesoglea is ethylene-propylene-diene monomer glue-line.
4. air conditioner rubber pipe according to claim 3, it is characterised in that described ethylene-propylene-diene monomer glue-line is the mixed material layer of one or more in Mitsui EPDM, Korea S SKEPDM, Du Pont DuPontEPDM.
5. the air conditioner rubber pipe according to claim 3 or 4, it is characterised in that described mesoglea thickness 0.8-1.5mm.
6. air conditioner rubber pipe according to claim 1, it is characterised in that described enhancement layer is aramid layers.
7. air conditioner rubber pipe according to claim 6, it is characterised in that described enhancement layer thickness is 0.4-0.8mm.
8. air conditioner rubber pipe according to claim 1, it is characterised in that described outer glue-line is ethylene-propylene-diene monomer glue-line.
9. air conditioner rubber pipe according to claim 1, it is characterised in that described outer glue-line is ethylene propylene diene rubber and polyolefin elastomer mixed rubber layer.
10. air conditioner rubber pipe according to claim 8 or claim 9, it is characterised in that described outer bondline thickness is 1-2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521065476.XU CN205298869U (en) | 2015-12-16 | 2015-12-16 | Empty glue mixing pipe of R744 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521065476.XU CN205298869U (en) | 2015-12-16 | 2015-12-16 | Empty glue mixing pipe of R744 |
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| Publication Number | Publication Date |
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| CN205298869U true CN205298869U (en) | 2016-06-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521065476.XU Active CN205298869U (en) | 2015-12-16 | 2015-12-16 | Empty glue mixing pipe of R744 |
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| CN (1) | CN205298869U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105423008A (en) * | 2015-12-16 | 2016-03-23 | 天津鹏翎胶管股份有限公司 | R744 air conditioner rubber tube and preparation method thereof |
| CN109340471A (en) * | 2018-10-25 | 2019-02-15 | 南京利德东方橡塑科技有限公司 | A kind of air conditioning hose and preparation method thereof meeting novel refrigerant |
-
2015
- 2015-12-16 CN CN201521065476.XU patent/CN205298869U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105423008A (en) * | 2015-12-16 | 2016-03-23 | 天津鹏翎胶管股份有限公司 | R744 air conditioner rubber tube and preparation method thereof |
| CN109340471A (en) * | 2018-10-25 | 2019-02-15 | 南京利德东方橡塑科技有限公司 | A kind of air conditioning hose and preparation method thereof meeting novel refrigerant |
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Effective date of registration: 20161213 Address after: 225324 Taizhou province high Port District Xu Zhuang Street, on the north side of the road to innovation, the east side of the road Patentee after: Jiangsu Pengling rubber hose Co., Ltd. Address before: 300000 Tianjin Binhai New Area in the middle of the Industrial Park Road, No. 1703 Patentee before: Tianjin Pengling Rubber Hose Co., Ltd. |