CN101666401B

CN101666401B - Direct current heating urea solution delivery hose

Info

Publication number: CN101666401B
Application number: CN2009101534448A
Authority: CN
Inventors: 王以余
Original assignee: ZHEJIANG IRON HORSE AUTO PARTS CO Ltd
Current assignee: Iron Horse Technology Co., Ltd.
Priority date: 2009-10-12
Filing date: 2009-10-12
Publication date: 2012-07-11
Anticipated expiration: 2029-10-12
Also published as: CN101666401A

Abstract

The invention provides a direct current heating urea solution delivery hose comprising a urea solution delivery inner tube and a macromolecule PTC hot wire, wherein the outer side of the urea solution delivery inner tube is tightly stuck to the macromolecule PTC hot wire with a self-thermal control function, and the PTC hot wire is led out via a lead and is connected with a control unit via a connector to heat the urea solution delivery inner tube. The urea solution delivery inner tube provided by the invention has enough strength, flexibility and ageing resistance, is not easy to permeate, can prevent urea solution from freezing, can prevent the urea solution delivery inner tube and urea solution from deteriorating because of local overheating, can favourably ensure that the SCR system can work at low temperature and urea solution flows in the pipeline, and has the advantages of anticorrosion and small abrasion.

Description

A kind of direct current heating urea solution delivery hose

Technical field

The present invention relates to a kind of electric heating urea solution delivery hose.

Background technique

Satisfy the heavy-duty diesel vehicle of state's 4 emission standards; Utilize SCR (SCR) exhaust after treatment system to handle nitrogen oxide (NOx); Meet the environmental regulation requirement to reach; Cardinal principle is to handle nitrogen oxide (NOx) through in exhaust gas treating device, quantitatively spraying into AdBlue (i.e. 32.5% urea liquid), and AdBlue begins to freeze in the time of-11 ℃.When thawing, AdBlue returns normal solution state.At long-term cold snap is in the area of normal conditions, and the SCR that can't work because pipeline freezes is unacceptable.Therefore, it is imperative to have an introducing of urea liquid delivery line of heating function.Also there was urea liquid delivery pipe to be shown in report with heating function in the past; But heat the urea liquid delivery pipe in the outside that this type pipe adopts general electric heating wire to be spirally wound on the urea liquid delivery pipe; The delivery pipe of this structure is no matter how high spiral density is, always on the urea delivery pipe, have the direct contacting point of electric heating wire and the direct temperature gradient of contacting point not; Both caused to be difficult to carry out temperature control, gone bad because of localized hyperthermia makes urea delivery pipe and interior urea liquid thereof easily.

Summary of the invention

Technical problem to be solved by this invention provides a kind of direct current heating urea solution delivery hose from temperature controlling function, homogeneous heating that has that can be applied on the automobile.For this reason; The present invention adopts following technological scheme: it comprises pipe in the urea liquid conveying; The pipe outside fits tightly the high molecular PTC electrically-heated-wire that has from temperature controlling function in the transport urea solution; And draw by lead, be connected the heating of pipe in realizing urea liquid carried with control unit through connector assembly; Said high molecular PTC electrically-heated-wire is laid along the length direction of interior pipe, and the metal aluminum foil layer in the outside of in urea liquid is carried, managing closely is wound with said high molecular PTC electrically-heated-wire also is contained in also is provided with insulation material layer at said metal aluminum foil layer.

Through above technological scheme, electric heating urea liquid delivery pipe provided by the present invention had both had enough intensity, ductility and ageing-resistant, was difficult for infiltration again; When ambient temperature is lower than the temperature of control unit setting; Heater circuit conducting, the metal aluminum foil layer that closely twines can guarantee urea liquid is carried the even heating of the whole tube wall of interior pipe, when heating-up temperature reaches the upper limiting temperature of setting; The temperature function of limit certainly of PTC makes current blocking; Thereby not only prevented urea liquid freeze but also avoid urea liquid carry in pipe go bad with the urea liquid local superheating, can guarantee well that the SCR system at mobile in pipeline of the work of low temperature environment and urea liquid, has the advantage of corrosion-resistant and low abrasion; Can be suitable for vehicle-mounted requirement, be suitable for automotive applications.

Description of drawings

Fig. 1 is an embodiment's provided by the present invention cross-sectional view.

Fig. 2 is an embodiment's provided by the present invention schematic representation.

Embodiment

With reference to accompanying drawing.The present invention includes composite urea solution and carry interior pipe 2, its skin 2.2 is that nylon is outer, and its internal layer 2.1 is made up of ethylene-tetrafluoroethylene copolymer (ETFE), and said internal layer and skin are combined as a whole.Fit tightly the high molecular PTC electrically-heated-wire 6 that has from temperature controlling function in the outer field outside of nylon; Skin is the metal aluminum foil layer 7 with conduction hot merit ability again; This layer closely twines in pipe 2 is included in electrically-heated-wire 6 in the urea liquid conveying, and also tight looping insulation material layer 5 outside metal aluminum foil layer 7 prevents that heat from leaking; Play function of heat insulation, outermost surface is to have waterproof, antifrictional insulating protective layer 3.

Said nylon skin can adopt PA12 (get by the omega-lauric lactam ring-opening polymerisation or by the 12 polycondensation, be commonly called as nylon 12) material.The ETFE material of said internal layer belongs to a kind of fluoroplastic, has the characteristics of impermeabilisation, corrosion-resistant and low abrasion.Said outer field PA12 material has the intensity that increases flexible pipe, reduces cost, wear-resisting and ageing-resistant characteristics.

Said length direction with pipe 2 in the high molecular PTC electrically-heated-wire 6 of temperature controlling function is carried along urea liquid is laid; Make urea solution delivery hose very convenient during fabrication; The metal aluminum foil layer 7 that is aided with simultaneously tight winding again; Make the reflect heat of electrically-heated-wire generation and evenly be transmitted to urea liquid and carry interior pipe 2, can guarantee urea liquid is carried the even heating of the whole tube wall of interior pipe.And, high molecular PTC electrically-heated-wire 6 be with high molecular polymer as heat generating material, the flames of anger, fire-retardant; This heat generating material has from temperature controlling function, and so-called " PTC " effect promptly has positive temperature and resistance effect; The phenomenon that the resistance that is meant heat generating material increases with the rising of temperature, therefore, it can adjust the electric heating output power automatically with variation of temperature; When temperature was higher than certain numerical value, its resistance trended towards infinity, and promptly output power is similar to zero; Stop heating, thus prevent urea liquid carry in the solution Yin Wendu of pipe body and internal flow too high and the variation of performance and quality takes place.

The tube head of pipe connected the fast plug 1 of plastics in said urea liquid was carried, and was connected with other parts.Urea liquid is carried inner pipe joint position 10; The material (clay) that use has a heat conductive insulating is coated in the connection part of the aluminium foil 7 of joint and body outsourcing; (clay solidifies the back) encapsulates with the adhesive tape looping; Thereby the heat of pipe body portion is incorporated into the plug position in urea liquid being carried, and makes the plug position also can obtain indirect heating.

Electrically-heated-wire 6 in the said electric heating urea pipe is drawn through lead, is connected with vehicle-mounted DC electrical source or is connected with the ECU of SCR system by plug 4.

Claims

1. direct current heating urea solution delivery hose that is applied on the automobile; Comprise pipe in the urea liquid conveying; It is characterized in that: the pipe outside fits tightly the high molecular PTC electrically-heated-wire that has from temperature controlling function in the transport urea solution; And draw by lead, be connected the heating of pipe in realizing urea liquid carried with control unit through connector assembly; Said high molecular PTC electrically-heated-wire is laid along the length direction of interior pipe, and the metal aluminum foil layer in the outside of in urea liquid is carried, managing closely is wound with said high molecular PTC electrically-heated-wire also is contained in also is provided with insulation material layer outside said metal aluminum foil layer;

The hose coupling position uses the material with heat conductive insulating to be coated in joint and urea liquid is carried interior connection part of managing the said metal aluminum foil layer of outsourcing, encapsulates with the adhesive tape looping.

2. a kind of direct current heating urea solution delivery hose that is applied on the automobile as claimed in claim 1, it is characterized in that outside said insulation material layer, being provided with have waterproof, antifrictional insulating protective layer.

3. a kind of direct current heating urea solution delivery hose that is applied on the automobile as claimed in claim 1; It is characterized in that pipe comprises nylon skin and the internal layer that is made up of ethylene-tetrafluoroethylene copolymer (ETFE) in the said urea liquid conveying, said internal layer and skin are combined as a whole.