CN201688071U - Metal-lined hot-melting fastening type pipe fitting - Google Patents
Metal-lined hot-melting fastening type pipe fitting Download PDFInfo
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- CN201688071U CN201688071U CN2010201889833U CN201020188983U CN201688071U CN 201688071 U CN201688071 U CN 201688071U CN 2010201889833 U CN2010201889833 U CN 2010201889833U CN 201020188983 U CN201020188983 U CN 201020188983U CN 201688071 U CN201688071 U CN 201688071U
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Abstract
The utility model discloses a metal-lined hot-melting fastening type pipe fitting, which aims to overcome the shortage that fastening pipe fittings in the prior art are poor in applicability. The metal-lined hot-melting fastening type pipe fitting comprises a plastic connecting part, an auxiliary fastening part and a fastening screw cap, the plastic connecting part comprises at least one connecting end, the connecting ends are communicated with each other through a passage in the plastic connecting part, a fastening contact surface, a protrusion portion and a contracture surface of a composite pipe form a multi-sealing hot-melting fastening type pipe fitting and a hot-melting surface of the composite pipe, the fastening screw cap is integrally clamped with the auxiliary fastening part and the plastic connecting part by aid of screw connection between screw cap inner thread and fastening outer thread, and metal lining layers are disposed in ports of the connecting ends of the plastic connecting parts and communicated with the connecting ends of the plastic connecting part. The metal-lined hot-melting fastening type pipe fitting can be applicable to various component pipes, and is firm in connection, strong in pressure resistance, fine in sealing property and convenient in use.
Description
Technical field
The utility model relates to a kind of pipeline connecting pipe fitting, and being used for internal and external layer is the connection that relates to tubing of " plastics-metal-plastics " of plastics.
Background technique
In the prior art, pure plastic pipe can't obtain the higher pressure that bears, and pure metal pipe antiseptic property is not good, and composite pipe has solved the relatively poor problem of pure plastic pipe intensity on the one hand, has solved the not good problem of metallic material pipe antiseptic property on the one hand.
The kind of metal-plastic composite pipe is very various, mainly is divided into four big classes according to structure:
1, inner plastic+outer layer metal two layer composite structure, typical case's representative of this pipeline is: (metal layer can be welded tube to the steel lining plastic composite, galvanized pipe, weldless tube, plastic layer, select according to practical use, mainly contain polyethylene (PE), heat-proof polythene (PE-RT), ABS, PPR, PA etc., reference technique rules: CECS125-2001 building water supply steel-plastic composite pipe pipework technical regulations), moulding aluminum alloy plastics lined pipe (CJ/T321-2010 city-building industry standard) is dialled in hot-drawn, internal plastic coating composite pipe (Reference standard: CJ/T120-2001 " feedwater plastic coated composite steel pipe " city-building industry standard).
2, the bonding layer+outer layer metal three-layer composite structure of inner plastic+hot melt adhesive, the typical case of this class pipeline is represented as: stainless steel lining plastic pipe (Reference standard number: CJ/T184-2003 stainless steel lining plastic pipe construction industry standard).
3, inner plastic+metallic intermediate layer+outer layer plastic three-layer composite structure, typical case's representative of this pipeline is: hole pattern steel band polythene composite pipe (with reference to CJ/T183-2003), Steel Skeleton polythene plastic composite pipe (with reference to CJ/T123-2004), the reticular structure of these two kinds of its metal layers of tubing determine this two classes tubing to need not to use the bonding layer of hot melt adhesive; Also has a kind of inside and outside plastic-coated steel-plastic composite pipe in addition, but in its actual production technology, in the plastic raw material of powdery prepares, reality has been infiltrated the melt viscosity jelly, because clear and definite " layer structure " is so can divide this three-layer composite structure (" feedwater plastic coated composite steel pipe " (CJ/T120-2001) city-building industry standard) into.
4, five layers of composite structure composite pipe of the bonding layer+outer layer plastic of the bonding layer+metallic intermediate layer of inner plastic+hot melt adhesive+hot melt adhesive, this class tubing mainly contains: steel wire mesh frame plastic composite tube (with reference to CJ/T189-2007), PSP steel-plastic composite pressure pipe (with reference to CJ/T183-2003), RPAP5 butt welding aluminium-plastic composite pipe (with reference to CJ/T 159--2006), butt joint or lap welding plastic-aluminum composite pressure pipe (with reference to the GBT18997-2003 plastic-aluminum composite pressure pipe), braided steel wire net polythene composite pipe (not having standard temporarily).
More than four classes, the definition aspect metal layer is all very clear and definite, plastic layer then adopts according to actual needs: polyethylene (PE), heat-proof polythene (PE-RT), PB, PPR, PA etc.
The appearance of composite pipe has solved the relatively poor problem (it is the higher pressure that bears that pure plastic pipe can't obtain) of pure plastic pipe intensity on the one hand, has solved the not good problem of metallic material pipe antiseptic property on the other hand.
For the Placement of above-mentioned metal-plastic type composite pipe, mainly should consider following manufacture characteristic:
1, tubing: for the 1st class (inner plastic+outer layer metal two layer composite structure), the 2nd class (the bonding layer+outer layer metal three-layer composite structure of inner plastic+hot melt adhesive) metal-plastic type composite pipe, because metal layer is in the outside of plastic layer, therefore metal must have good anti-corrosion, otherwise the life-span can't guarantee, such as adopting aluminum alloy or stainless steel; And the 3rd class (inner plastic+metallic intermediate layer+outer layer plastic three-layer composite structure composite pipe), the 4th class (five layers of composite structure composite pipe of the bonding layer+outer layer plastic of the bonding layer+metallic intermediate layer of inner plastic+hot melt adhesive+hot melt adhesive), because metal is wrapped in the middle of the internal and external layer plastics, then metal can adopt multiple material: such as steel wire, stainless steel, steel band, aluminium strips etc., this two classes composite pipe has good anti-corrosion.
2, tube connection piece: any Placement no matter, except that metal layer is stainless composite pipe, must consider that all metal layer can not contact with fed sheet of a media, otherwise can cause the corrosion of metal layer, the one side pollution medium, because of the metal layer corrosion, influence the actual pressure-bearing and the working life of pipeline on the one hand.
Existing the Placement that aforementioned tubes adopted is mainly contained:
1, application number be 00224343.1, notice of authorization day be December 13 in 2000 day, be called that the Chinese utility model patent of " Thin Stainless Steel pipe connector " and application number are 02276827.0, notice of authorization day is that the Chinese utility model patent that July 30 in 2003, day, were called " metal foil pipe connector " discloses screw thread FERRULETYPE link respectively, the characteristics of this kind pipe fitting are: be fit to various types of composite metal-plastic pipes, but material uses copper or stainless steel, cost an arm and a leg poor reliability;
Application number is 200720184505.3, notice of authorization day is that the Chinese utility model patent that Augusts 6 in 2008, day, were called " pipeline enlarging linkage structure " has adopted the higher plastics of hardness, but it relies on rubber seal fully, inapplicable large diameter pipeline, rubber is aging easily simultaneously, influences the pipe-line system life-span;
2, application number be 00218383.8, notice of authorization day be June 27 calendar year 2001 day, be called that the Chinese utility model patent of " clamp-press type pipe " and application number are 200320129209.5, notice of authorization day is that the Chinese utility model patent that December 15 in 2004, day, were called " hot melt clamp-press type composite pipe fitting " discloses hot melt (or socket joint) clamp-press type pipe respectively, mainly be applicable to the stainless steel lining plastic pipe, better performances, but the inner wall hot melt of single basically dependence tubing, reliability are slightly inadequate;
3, pure plastic hot melt pipe fitting, this kind pipe fitting will be peelled off the outer layer metal of posetionof weld before installing, owing to do not have metal to strengthen at link position, then pressure-bearing significantly reduces, soundness is poor;
4, application number is 200520101882.7, notice of authorization day is that the Chinese utility model patent that July 19 in 2006, day, were called " two-sided thermofusible spigot joint " discloses a kind of suitable outer layer plastic+metallic intermediate layer+inner plastic and the middle link that adds the tubing of two-layer bonded material again, as aluminium-plastic composite pipe, RPAP5, PSP steel-plastic composite pressure pipe, hole pattern steel band reinforced plastics composite tube, the connection of this kind link is reliable, cost is lower, shortcoming is considered on the mechanics, the steadiness deficiency.
5, plastic electrofusion pipe fitting, the steel wire mesh frame plastic composite tube, hole pattern steel band reinforced plastics composite tube, the steel skeleton plastic clad pipe that are mainly PE class larger caliber use, the technology content of electric melting pipe fittings is higher, connect reliable, defective is strictness is carried out in requirement to the port of tubing the processing of sealing, stop end plane metal and contact with fed sheet of a media, method commonly used is to use seal mouth ring and pipe hot melting to seal.
In the installation process of plastic electrofusion pipe fitting, for the requirement that guarantees to seal need be used large-scale heat sealing equipment, and usually do not possess such condition during site construction, and for small-bore pipe, except that steel wire mesh frame plastic composite tube and steel frame-plastic enhancing composite pipe, other internal layer adopts metal sheet, seal processing more difficulty, cost of production is higher, installation specification is high.
The model utility content
The purpose of this utility model is to disclose a kind of inner liner metal hot melting fastening type pipe fitting, to solve fastening pipe fitting of the prior art defective poor for applicability.
Inner liner metal hot melting fastening type pipe fitting described in the utility model, comprise plastic fastening, assisted fasteners and fastening nut, plastic fastening comprises at least one connecting end, each connecting end communicates with each other by the passage in the plastic fastening, be provided with projection and fastening surface of contact successively from the mediad outer end at each connecting end, projection direction outward is provided with protuberance, recessed space between protuberance and the fastening surface of contact with treat that the fastening composite pipe mouth of pipe of hot melt is adaptive, fastening surface of contact, the surface of contact of protuberance and composite pipe forms the hot melt surface of inner liner metal hot melting fastening type pipe fitting and composite pipe, on projection, be provided with fastening outside thread, the assisted fasteners that can be sleeved on the composite pipe is arranged between plastic fastening and the fastening nut, the internal surface of fastening nut be provided with can be adaptive with fastening outside thread the nut internal thread, fastening nut is by nut internal thread and fastening externally threaded being spirally connected and assisted fasteners, plastic fastening is nipped into one, be provided with the metal inner lining layer in the port of the connecting end of plastic fastening, the metal inner lining layer connects between each connecting end of plastic fastening.
Wherein, assisted fasteners is made by rubber or plastics.
Wherein, the inner liner metal hot melting fastening type pipe fitting also comprises the fastening rubber ring of waterproof, and the fastening rubber ring of waterproof is clipped between plastic fastening, the assisted fasteners.
Wherein, the inner liner metal hot melting fastening type pipe fitting also comprises auxiliary fastening annulus, and auxiliary fastening annulus is clipped between the fastening rubber ring of waterproof, the assisted fasteners.
Wherein, the inner liner metal hot melting fastening type pipe fitting also comprises the exhaust angle, and the exhaust angle is arranged at the outer end on hot melt surface.
Wherein, the metal inner lining layer is made by copper or stainless steel.
Wherein, be respectively equipped with in the outer end edges of plastic fastening connecting end and be used to collect the hot melt surface is connected the unnecessary melt of generation with composite pipe mouth of pipe hot melt material-storing groove.
Wherein, be provided with the nut mouth of pipe at the tail end of fastening nut, the outer surface of the nut mouth of pipe and assisted fasteners is adaptive, and the maximum inner diameter of the nut mouth of pipe is less than the maximum outside diameter of assisted fasteners.
Wherein, the interior of fastening nut increases without leave outside to inside successively, and the external diameter of assisted fasteners increases from inside to outside successively.
Wherein, the angle of inclination that the internal diameter of fastening nut increases successively is the 1-10 degree, and the angle of inclination that the external diameter of assisted fasteners increases successively is the 1-10 degree.
Inner liner metal hot melting fastening type pipe fitting of the present utility model, go for the use sight of multiple composite pipe, be connected firmly, anti-stress is strong, good airproof performance, easy to use, special in the less composite pipe of internal diameter, its installation is especially convenient, fastening especially firmly, sealing is especially good, anti-stress is especially strong.
Description of drawings
Fig. 1 is the front view of the utility model inner liner metal hot melting fastening type pipe fitting;
Fig. 2 is the stereogram of the utility model inner liner metal hot melting fastening type pipe fitting;
Fig. 3 be the utility model inner liner metal hot melting fastening type pipe fitting embodiment one A-A to sectional drawing;
Fig. 4 is the utility model inner liner metal hot melting fastening type pipe fitting embodiment one assembling finishing stage figure;
Fig. 5 is that composite pipe of the present utility model is the sectional drawing of all-plastic;
Fig. 6 is that composite pipe internal layer of the present utility model and skin are the sectional drawing of metal for plastics, mesosphere;
Fig. 7 is that composite pipe internal layer of the present utility model is that plastics, skin are the sectional drawing of metal;
Fig. 8 is the structural representation of plastic fastening of the present utility model;
Fig. 9 be the utility model inner liner metal hot melting fastening type pipe fitting embodiment two A-A to sectional drawing;
Figure 10 the utility model inner liner metal hot melting fastening type pipe fitting embodiment two assembling finishing stage figure.
Mark the following drawings mark thereon in conjunction with the accompanying drawings:
The 1-plastic fastening, 2-projection, the fastening outside thread of 3-, 4-protuberance, the fastening surface of contact of 5-, 6-material-storing groove, the fastening rubber ring of 7-waterproof, 8-assists fastening annulus, 9-assisted fasteners, 10-nut internal thread, the 11-fastening nut, the 12-nut mouth of pipe, 13-composite pipe, 14-metal inner lining layer, 15-plastic layer, 16-metal middle level, the 17-plastic outer layer, 18-inner plastic, 19-exhaust angle.
Embodiment
Below in conjunction with accompanying drawing, an embodiment of the present utility model is described in detail, but is to be understood that protection domain of the present utility model is not subjected to the restriction of embodiment.
As Fig. 1-shown in Figure 10, the utility model inner liner metal hot melting fastening type pipe fitting is applicable to the 3rd class formation (inner plastic+metallic intermediate layer+outer layer plastic three-layer composite structure composite pipe) and the 4th class formation (five layers of composite structure composite pipe of the bonding layer+outer layer plastic of the bonding layer+metallic intermediate layer of inner plastic+hot melt adhesive+hot melt adhesive) in the background technique.
As shown in Figure 6, show the structure of the 3rd class in the background technique, composite pipe among Fig. 6 comprises the inner plastic 18 that is arranged on internal layer, be arranged on the metal middle level 16 in middle level, be arranged on outer field plastic outer layer 17, those skilled in the art should expect, the 3rd class mechanism of inner liner metal hot melting fastening type pipe fitting of the present utility model in being applicable to background technique, the 4th class formation, be applicable to that also composite pipe is the structure of all-plastic, as shown in Figure 5, the composite pipe among Fig. 5 is made up of the plastic layer 15 of all-plastic.
In addition, inner liner metal hot melting fastening type pipe fitting of the present utility model also is applicable to the 1st class formation (inner plastic+outer layer metal two layer composite structure) in the background technique, and as shown in Figure 7, its internal layer of the composite pipe among Fig. 7 is plastics, and skin is a metal.
Shown in Fig. 1-4, inner liner metal hot melting fastening type pipe fitting embodiment one of the present utility model is disclosed, the composite pipe of present embodiment is the common mouth of pipe (the non-hole enlargement mouth of pipe).
The inner liner metal hot melting fastening type pipe fitting of present embodiment comprises plastic fastening 1, assisted fasteners 9 and fastening nut 11, plastic fastening 1 comprises two connecting ends, each connecting end communicates with each other by the passage in the plastic fastening 1, be provided with projection 2 and fastening surface of contact 5 successively from the mediad outer end at each connecting end, projection 2 direction outward is provided with protuberance 4, recessed space and adaptive connection of composite pipe 13 tube walls between protuberance 4 and the fastening surface of contact 5, fastening surface of contact 5, protuberance 4 and the surface of contact formation inner liner metal hot melting fastening type pipe fitting of composite pipe 13 and the hot melt surface of composite pipe, on projection 2, be provided with fastening outside thread 3, the assisted fasteners 9 that can be sleeved on the composite pipe is arranged between plastic fastening 1 and the fastening nut 11, the internal surface of fastening nut 11 be provided with can be adaptive with fastening outside thread 3 nut internal thread 10, fastening nut 11 is spirally connected and assisted fasteners 9 by nut internal thread 10 and fastening outside thread 3, plastic fastening 1 is nipped into one, be provided with metal inner lining layer 14 in the port of the connecting end of plastic fastening, metal inner lining layer 14 connects between each connecting end of plastic fastening 1.
Hot melt is carried out when handling in the hot melt surface that can guarantee the composite pipe mouth of pipe and inner liner metal hot melting fastening type pipe fitting that is provided with of metal inner lining layer 14, plastic fastening 1 can be because of softening transform, influence the welding effect, guaranteed soundness and tightness that composite pipe connects; Wherein, metal inner lining layer 14 is made by steel or stainless steel.
Need to prove that if the inner liner metal hot melting fastening type pipe fitting is used to connect two composite pipes, its Placement will comprise two connecting ends, as shown in this embodiment; If the inner liner metal hot melting fastening type pipe fitting is used to connect the tail end of a composite pipe, the inner liner metal hot melting fastening type pipe fitting will include only a connecting end, link to each other with composite pipe.
Preferably, assisted fasteners 9 can be made by rubber, also can be made of plastics.
Wherein, the inner liner metal hot melting fastening type pipe fitting also comprises fastening rubber ring 7 of waterproof and auxiliary fastening annulus 8, and it is installed between plastic fastening 1, the assisted fasteners 9 from inside to outside successively.
Wherein, be provided with material-storing groove 6, be used to collect the hot melt surface is connected generation with composite pipe mouth of pipe hot melt unnecessary melt in the outer end edges of plastic fastening 1 connecting end.
In inner liner metal hot melting fastening type pipe fitting of the present utility model, be provided with the nut mouth of pipe 12 at the tail end of fastening nut 11, the nut mouth of pipe 12 is adaptive with the outer surface of assisted fasteners 9, and the maximum inner diameter of the nut mouth of pipe 12 is less than the maximum outside diameter of assisted fasteners 9.The interior of fastening nut 11 increases without leave outside to inside successively, and the external diameter of assisted fasteners 9 increases from inside to outside successively.The angle of inclination that the internal diameter of fastening nut 11 increases successively is the 1-10 degree, and the angle of inclination that the external diameter of assisted fasteners 9 increases successively is the 1-10 degree.
Preferably, the outer end on the hot melt surface that is connected with the hot melt of composite pipe of the protuberance 4 of plastic fastening 1 of the present utility model is provided with and is used for exhaust angle 19 that plastic fastening 1 and composite pipe reflow process are carried out exhaust.
The inner liner metal hot melting fastening type pipe fitting of present embodiment in use, earlier with fastening nut 11, assisted fasteners 9, auxiliary fastening annulus 8, the fastening rubber ring 7 of waterproof plug-in mounting is successively gone into the composite pipe mouth of pipe, the mouth of pipe plug-in mounting of composite pipe is advanced recessed space between protuberance 4 and the fastening surface of contact 5, to fastening surface of contact 5, protuberance 4 carries out hot melt with the inner liner metal hot melting fastening type pipe fitting that the surface of contact of composite pipe forms with the hot melt surface of composite pipe and is connected, then the direction of fastening nut 11 to plastic fastening 1 compressed, the fastening outside thread 3 of nut internal thread 10 interlocks of fastening nut 11, with assisted fasteners 9, auxiliary fastening annulus 8, the direction extruding tightly of the fastening rubber ring 7 of waterproof to plastic fastening 1, thus composite pipe and inner liner metal hot melting fastening type pipe fitting is firmly fixing.
Shown in Fig. 9-10, inner liner metal hot melting fastening type pipe fitting embodiment two of the present utility model is disclosed, the composite pipe of present embodiment is the hole enlargement mouth of pipe, those skilled in the art will be appreciated that, other structure of the inner liner metal hot melting fastening type pipe fitting of present embodiment is identical with embodiment one structure, does not repeat them here.
Inner liner metal hot melting fastening type pipe fitting of the present utility model goes for the use sight of multiple composite pipe, is connected firmly, anti-stress is strong, and good airproof performance is easy to use, special in the less composite pipe of internal diameter, it is fastening especially firmly, sealing is especially good, anti-stress is especially strong.
More than disclosed only be several specific embodiment of the present utility model, still, the utility model is not limited thereto, any those skilled in the art can think variation all should fall into protection domain of the present utility model.
Claims (10)
1. inner liner metal hot melting fastening type pipe fitting, it is characterized in that, comprise plastic fastening, assisted fasteners and fastening nut, described plastic fastening comprises at least one connecting end, each described connecting end communicates with each other by the passage in the described plastic fastening, be provided with projection and fastening surface of contact successively from the mediad outer end at each described connecting end, described projection direction outward is provided with protuberance, recessed space between described protuberance and the described fastening surface of contact with treat that the fastening composite pipe mouth of pipe of hot melt is adaptive, described fastening surface of contact, the surface of contact of protuberance and described composite pipe forms the hot melt surface of described inner liner metal hot melting fastening type pipe fitting and composite pipe, on described projection, be provided with fastening outside thread, the described assisted fasteners that can be sleeved on the described composite pipe is arranged between described plastic fastening and the fastening nut, the internal surface of described fastening nut be provided with can be adaptive with described fastening outside thread the nut internal thread, described fastening nut is by described nut internal thread and fastening externally threaded being spirally connected and described assisted fasteners, plastic fastening is nipped into one, be provided with the metal inner lining layer in the port of the connecting end of described plastic fastening, described metal inner lining layer connects between each described connecting end of described plastic fastening.
2. inner liner metal hot melting fastening type pipe fitting according to claim 1 is characterized in that described assisted fasteners is made by rubber or plastics.
3. inner liner metal hot melting fastening type pipe fitting according to claim 1 is characterized in that, also comprises the fastening rubber ring of waterproof, and the fastening rubber ring of described waterproof is clipped between described plastic fastening, the assisted fasteners.
4. inner liner metal hot melting fastening type pipe fitting according to claim 3 is characterized in that, also comprises auxiliary fastening annulus, and described auxiliary fastening annulus is clipped between the fastening rubber ring of described waterproof, the assisted fasteners.
5. inner liner metal hot melting fastening type pipe fitting according to claim 1 is characterized in that, also comprises the exhaust angle, and described exhaust angle is arranged at the outer end on described hot melt surface.
6. inner liner metal hot melting fastening type pipe fitting according to claim 1 is characterized in that, described metal inner lining layer is made by copper or stainless steel.
7. inner liner metal hot melting fastening type pipe fitting according to claim 1, it is characterized in that, be respectively equipped with in the outer end edges of described plastic fastening connecting end and be used to collect described hot melt surface is connected the unnecessary melt of generation with described composite pipe mouth of pipe hot melt material-storing groove.
8. inner liner metal hot melting fastening type pipe fitting according to claim 1, it is characterized in that, tail end at described fastening nut is provided with the nut mouth of pipe, the outer surface of the described nut mouth of pipe and described assisted fasteners is adaptive, and the maximum inner diameter of the described nut mouth of pipe is less than the maximum outside diameter of described assisted fasteners.
9. inner liner metal hot melting fastening type pipe fitting according to claim 8 is characterized in that, the interior of described fastening nut increases without leave outside to inside successively, and the external diameter of described assisted fasteners increases from inside to outside successively.
10. inner liner metal hot melting fastening type pipe fitting according to claim 9 is characterized in that, the angle of inclination that the internal diameter of described fastening nut increases successively is the 1-10 degree, and the angle of inclination that the external diameter of described assisted fasteners increases successively is the 1-10 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201889833U CN201688071U (en) | 2010-05-13 | 2010-05-13 | Metal-lined hot-melting fastening type pipe fitting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201889833U CN201688071U (en) | 2010-05-13 | 2010-05-13 | Metal-lined hot-melting fastening type pipe fitting |
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| Publication Number | Publication Date |
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| CN201688071U true CN201688071U (en) | 2010-12-29 |
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| CN2010201889833U Expired - Fee Related CN201688071U (en) | 2010-05-13 | 2010-05-13 | Metal-lined hot-melting fastening type pipe fitting |
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| CN (1) | CN201688071U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110748729A (en) * | 2019-08-28 | 2020-02-04 | 嘉兴通达机械有限公司 | Hydraulic pipe fitting sleeve |
-
2010
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110748729A (en) * | 2019-08-28 | 2020-02-04 | 嘉兴通达机械有限公司 | Hydraulic pipe fitting sleeve |
| CN110748729B (en) * | 2019-08-28 | 2021-08-03 | 嘉兴通达机械有限公司 | Hydraulic pipe fitting sleeve |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101229 Termination date: 20180513 |
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| CF01 | Termination of patent right due to non-payment of annual fee |