CN113124241A

CN113124241A - Novel urea pipe and production process thereof

Info

Publication number: CN113124241A
Application number: CN202010047574.XA
Authority: CN
Inventors: 吴宝双
Original assignee: Tianjin Boyuansheng Automobile Components Manufacturing Co ltd
Current assignee: Tianjin Boyuansheng Automobile Components Manufacturing Co ltd
Priority date: 2020-01-16
Filing date: 2020-01-16
Publication date: 2021-07-16

Abstract

The invention relates to the technical field of urea pipelines, and discloses a novel urea pipe which comprises an outer layer and an inner layer, wherein a reinforcing layer is woven between the outer layer and the inner layer, a layer of the outer layer, which is close to an aramid fiber wire, is spirally wound with a conducting wire, and the outer layer and the inner layer are bonded into a whole through an extrusion coating process; the novel urea pipe is internally provided with a lead, and can generate heat through an external heating device, so that the urea solution in the pipeline can reach the required temperature, and the phenomena of crystallization and the like in the urea solution in the urea pipe are prevented; and provides a production process of the urea pipe.

Description

Novel urea pipe and production process thereof

Technical Field

The invention relates to the technical field of urea pipelines, in particular to a novel urea pipe and a production process thereof.

Background

The urea pipe is used for diesel vehicles to convey DEF urea solution. DEF urea solution is a liquid reductant that catalytically reduces nitrogen oxides in the exhaust to nitrogen and water in an SCR system. The urea for the vehicle is decomposed at a certain temperature to generate ammonia to perform selective catalytic reduction on nitrogen oxides (NOx), so that the aims of saving energy and reducing emission are fulfilled.

Therefore, the urea pipe needs to be heated to a certain temperature when in use, and the prior method is named as a urea pipe electric heating device (CN207470266U) like Chinese invention patent, wherein joints are arranged at two ends of the urea pipe, the urea pipe is uniformly wound by an electric heating wire, and a binding belt is wound outside the electric heating wire so as to ensure that the electric heating wire and the urea pipe are directly kept in good contact, and simultaneously, the heat loss is reduced. However, the winding mode of the binding band is easy to loosen, and the binding band is usually wound manually during processing, so that the manual winding difference is large, and the labor cost is high.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a novel urea pipe, wherein a lead is arranged in the novel urea pipe, and the novel urea pipe can generate heat through an external heating device, so that the urea solution in a pipeline can reach the required temperature, and the phenomena of crystallization and the like in the urea solution and the urea pipe are prevented; and provides a production process of the urea pipe.

In order to achieve the first object, the invention provides the following technical scheme:

the utility model provides a novel urea pipe, includes skin and inlayer, the skin with the enhancement layer has been woven between the inlayer, the skin is close to aramid fiber line one deck spiral winding has the wire, the skin with the inlayer is as an organic whole through extruding cladding technology bonding.

In the present invention, it is preferable that both the outer layer and the inner layer are made of EPDM.

In the invention, preferably, the reinforcing layer comprises a braided wire layer, and the braided wire layer is formed by cross-braiding aramid wires or polyester fibers; and the braided wire layer is braided to be provided with wire holes.

In the invention, preferably, the two conducting wires are wound around each other along the central line direction, and at any section, the two conducting wires are arranged symmetrically relative to the center of the urea pipe.

In the present invention, it is preferable that the lead is provided outside the protective layer.

In the present invention, it is preferable that the urea pipe is further connected with a quick coupling.

In the present invention, it is preferable that the quick coupling includes a coupling body and a plug portion integrally formed with the coupling body.

In the present invention, preferably, the plug portion includes a first connecting portion formed in a circular truncated cone shape, a second connecting portion formed integrally with the plug body, and an intermediate connecting portion for connecting the first connecting portion and the second connecting portion.

In the invention, preferably, the second connecting portion is provided with an annular boss, and an annular groove matched with the annular boss is formed at one end of the urea pipe connected with the quick coupling.

In the invention, preferably, a clamping sleeve is further arranged at the joint of the quick connector and the urea pipe.

In order to achieve the second object, the invention provides the following technical scheme:

a production process of a novel urea pipe comprises the following steps: putting the inner layer material into an extruder, inserting the core of the extruder into the inner tube to extrude the inner layer tube, weaving the rear reinforcing layer outside the inner layer tube, winding the wire layer outside the strong wire layer, finally coating the outer layer, vulcanizing, depoling, cleaning, pressurizing and discharging water stain on the inner wall of the rubber tube to obtain the urea tube, and packaging the urea tube into a finished product after inspection.

Compared with the prior art, the invention has the beneficial effects that:

the novel urea pipe is internally provided with the conducting wire, and can generate heat through the external heating device, so that the urea solution in the pipeline can reach the required temperature, and the phenomena of crystallization and the like in the urea pipe of the urea solution are prevented;

the novel urea pipe is internally provided with the reinforcing layer, aramid wires on the braided wire layer are mutually braided and crossed, the aramid wires on the threading reinforcing layer sequentially penetrate through the aramid wire holes on the braided wire layer with the same cross section, the crossing points of the aramid wires on the braided wire layer are fixed in an integrally-formed mode by spraying an adhesive and extruding and coating the outer layer by using extrusion equipment, and the adhesive strength is higher.

Drawings

Fig. 1 is a schematic structural diagram of a novel urea pipe in this example 1.

Fig. 2 is an enlarged view of fig. 1 at a.

Fig. 3 is a schematic structural diagram of a novel urea pipe in this embodiment 1.

Fig. 4 is an enlarged view of fig. 3 at B.

FIG. 5 is a force-deformation graph of a sample No. 1 urea tube subjected to a peeling test.

FIG. 6 is a force-deformation graph of a first set of No. 3 urea pipe samples subjected to a stripping test.

FIG. 7 is a force-deformation graph of a second set of No. 3 urea pipe samples subjected to a peeling test.

Fig. 8 is a graph of time versus burst pressure for the burst test of sample No. 1 urea pipe.

Fig. 9 is a graph of time versus burst pressure for the burst test of sample No. 2 urea pipe.

Fig. 10 is a graph of time versus burst pressure for the burst test of sample No. 3 urea pipe.

Fig. 11 is a schematic structural diagram of a novel urea pipe in this example 2.

Fig. 12 is a schematic view of a split structure of a novel urea pipe in this example 2.

Fig. 13 is a schematic structural diagram of a quick coupling in a novel urea pipe in this embodiment 2.

Fig. 14 is a schematic structural diagram of a ferrule in the novel urea pipe in this embodiment 2.

In the drawings: 1-urea tube, 11-outer layer, 12-lead, 13-reinforced layer, 131-braided wire layer, 132-threading reinforced layer, 133-thread hole, 14-inner layer and 15-protective layer;

2-quick connector, 21-connector body, 22-plug part, 221-first connecting part, 222-second connecting part, 223-middle connecting part, 224-annular boss and 23-ferrule.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Example 1: referring to fig. 1 to 4, a preferred embodiment of the present invention provides a novel urea pipe, which includes an outer layer 11 and an inner layer 14, wherein a reinforcing layer 13 is woven between the outer layer 11 and the inner layer 14, a conductive wire 12 is spirally wound on the outer layer 11 close to the aramid fiber wire, and the outer layer 11 and the inner layer 14 are bonded into a whole through an extrusion coating process.

In the present embodiment, the outer layer 11 and the inner layer 14 are both made of EPDM, i.e., ethylene propylene diene monomer, which is a copolymer of ethylene, propylene and a small amount of non-conjugated diene, and is one of ethylene propylene rubbers. The main chain of the composite material consists of chemically stable saturated hydrocarbon, and only contains unsaturated double bonds in the side chain, so that the composite material has excellent ozone resistance, heat resistance, weather resistance and other aging resistance, and can be widely used in the fields of automobile parts, waterproof materials for buildings, wire and cable sheaths, heat-resistant rubber tubes, adhesive tapes, automobile sealing parts and the like.

In the present embodiment, the reinforcing layer 13 includes a braided wire layer 131, and the braided wire layer 131 is formed by cross-braiding aramid wires or polyester fibers; a wire hole 133 is reserved in the weaving of the weaving wire layer 131, and the wire hole 133 is in a diamond shape; the surface of the braided wire layer 131 is coated or sprayed with an adhesive, and then the braided wire layer and the conducting wire 12 are subjected to an extrusion coating process in an extruder through the outer layer 11, so that three layers are bonded into a whole, and the bonding strength is higher.

Enhancement layer 13 still includes threading enhancement layer 132, threading enhancement layer 132 is aramid fiber line along 1 central align to grid in urea pipe, just the aramid fiber line of threading enhancement layer 132 link up same cross-section in proper order the line hole 133. The aramid yarn cross point of the threading reinforcing layer 132 and the aramid yarn cross point of the braided wire layer 131 are fixed in an integrated forming mode by spraying an adhesive and extruding and coating the outer layer by using an extruding device, and the adhesive strength is higher.

The reinforcing wire in the reinforcing layer 13 is preferably aramid fiber wire which is formed by twisting aramid 1414 fibers, has extremely high strength which is more than 28 g/denier and is 5-6 times of that of high-quality steel, the modulus is 2-3 times of that of steel or glass fibers, the toughness is 2 times of that of steel, and the weight is only 1/5 of that of steel; the continuous use temperature range is extremely wide, and the device can normally operate for a long time within the range of-196 ℃ to 204 ℃.

In this embodiment, the two wires 12 are included, the two wires 12 are wound around each other along the central line direction, and at any cross section, the two wires 12 are arranged symmetrically with respect to the center of the urea pipe 1, and the two wires 12 coat the urea pipe 1, so that the heating area is relatively uniform during heating.

In the present embodiment, the lead 12 is disposed outside the protective layer 15, and the material of the protective layer 15 is polyvinyl chloride (PVC), Polyethylene (PE), perfluoroethylene propylene (F46), or the like.

Be provided with wire 12 in this urea pipe, can generate heat through external heating device, guarantee in the pipeline that urea solution can reach required temperature, prevent that urea solution from appearing phenomenons such as crystallization in the urea pipe again.

The production process of the urea pipe in the embodiment comprises the following steps: putting the inner layer material into an extruder, inserting the core of the extruder into the inner tube to extrude the inner layer tube, weaving the rear reinforcing layer outside the inner layer tube, winding the wire layer outside the strong wire layer, finally coating the outer layer, vulcanizing, depoling, cleaning, pressurizing and discharging water stain on the inner wall of the rubber tube to obtain the urea tube.

Firstly, 3 batches of urea tubes (different in the resistance value of the urea tube) were prepared according to the above process, and were respectively subjected to sampling detection (including the appearance, diameter and resistance value of the urea tube), as shown in table 1:

TABLE 1

Note: the above test is an average value of test data of randomly drawn 5 samples out of 100 samples.

As can be seen from the data in Table 1, the urea pipe produced in this example meets the requirements of appearance, diameter and resistance value.

Secondly, stripping experiments are respectively carried out on the urea pipes of the batches, and the specific experimental conditions are as follows:

(1) any three urea tube No. 1 samples were selected for the peeling test at a test temperature of 23 ℃, and the specific data are shown in Table 2:

TABLE 2

Note: the force value-deformation diagram during the specific experiment is shown in fig. 5.

As can be seen from Table 2 and FIG. 5, the average peel force and average peel strength during peeling of three urea pipe No. 1 samples with the same diameter prepared by the method are both satisfactory, and the CV values of the average peel strength are both less than 3%, indicating that the urea pipe has good stability and strength and is not easy to peel.

(2) Two urea tubes 3 with different diameters are respectively selected from the two urea tubes 3 to carry out a stripping experiment at a test temperature of 23 ℃, and the specific data are shown in table 3:

TABLE 3

Note: the force value-deformation graph during the specific experiment is shown in fig. 6 and 7.

As can be seen from table 2, fig. 6 and fig. 7, when the difference between the same diameter and the number 3 of the urea tube prepared by the method is ± 1mm, the average peel force and the average peel strength during peeling both meet the requirements, and the CV value of the average peel strength is less than 5%.

Thirdly, blasting experiments are respectively carried out on the urea pipes in the batches, and the specific experimental conditions are as follows:

(1) the sample No. 1 urea pipe is subjected to a blasting experiment (the standard requirement is more than or equal to 5MPa) at the blasting pressure of 10MPa and the blasting speed of 6MPa/min, the specific experimental process is shown in figure 8, and the pressure peak value of the sample No. 1 urea pipe during blasting is 6.387MPa, which meets the requirement.

(2) The sample No. 2 of the urea pipe is subjected to a blasting experiment (the standard requirement is more than or equal to 5Mpa) at the blasting pressure of 12Mpa and the blasting speed of 6Mpa/min, the specific experimental process is shown in figure 9, and the pressure peak value during the blasting of the urea pipe 2 is 5.775Mpa, which meets the requirements.

(3) The method comprises the following steps of carrying out a blasting experiment (the standard requirement is more than or equal to 5MPa) on a No. 3 sample of the urea pipe at the blasting pressure of 12MPa and the blasting speed of 6MPa/min, wherein the specific experimental process is shown in figure 10, and the pressure peak value during the blasting of the urea pipe 3 is 6.889MPa, which meets the requirement.

Example 2: referring to fig. 1 to 14, a preferred embodiment of the present invention provides a novel urea pipe, which is different from example 1 only in that: the urea pipe 1 is also connected with a quick joint 2, so that the urea pipe 1 is connected with a female joint or a male joint on an automobile;

further, the quick coupling 2 includes a coupling body 21 and a plug portion 22 integrally formed with the coupling body 21.

In the present embodiment, the plug portion 22 includes a first connecting portion 221 in a circular truncated cone shape, a second connecting portion 222 integrally formed with the connector body 21, and an intermediate connecting portion 223 for connecting the two, which are integrally formed; the first connecting part 221 in the shape of a circular truncated cone can quickly connect the quick connector 2 with the urea pipe; second connecting portion 222 is equipped with annular boss 224, urea pipe 1 with quick-operation joint 2 is connected one end and is equipped with the ring channel that annular boss 224 matches, annular boss 224 joint can prevent that urea pipe 1 from breaking away from quick-operation joint 2 at will in the ring channel.

Furthermore, the intermediate connecting portion 223 can be provided with a thread, which has a certain anti-slip function.

Furthermore, a cutting sleeve 23 is further arranged at the joint of the quick connector 2 and the urea pipe 1, the cutting sleeve 23 comprises a first body and a second body, the first body and the second body are both provided with an arc-shaped clamping seat 231 and clamping pieces 232, and the clamping pieces 232 are arc-shaped and concave and are arranged at equal intervals along the circumferential direction of the first body or the second body;

the cassette 231 of first body is equipped with grafting portion, and the cassette 231 of second body is equipped with the inserting groove that matches with grafting portion, and the grafting portion of first body is pegged graft to the inserting groove of second body in, realizes first body and the concatenation of second body, carries out the centre gripping to urea pipe 1 and consolidates, further prevents that urea pipe 1 from breaking away from quick-operation joint 2.

When the quick connector is used, the quick connector 2 is inserted into the urea pipe 1, so that the annular boss 224 is clamped into the annular groove, and the urea pipe 1 can be prevented from being separated from the quick connector 2 at will;

then the inserting part of the first body of the clamping sleeve 23 is inserted into the inserting groove of the second body of the clamping sleeve 23, so that the first body and the second body are spliced, the urea pipe 1 is clamped and reinforced, and the urea pipe 1 is further prevented from being separated from the quick connector 2; thus, the mounting process is completed.

The above description is intended to describe in detail the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the claims of the present invention, and all equivalent changes and modifications made within the technical spirit of the present invention should fall within the scope of the claims of the present invention.

Claims

1. The utility model provides a novel urea pipe, includes outer layer (11) and inlayer (14), its characterized in that, outer layer (11) with enhancement layer (13) have been woven between inlayer (14), outer layer (11) are close to aramid fiber line one deck spiral winding has wire (12), outer layer (11) with inlayer (14) are as an organic whole through extruding cladding technology bonding.

2. The urea pipe according to claim 1, wherein the outer layer (11) and the inner layer (14) are both made of EPDM.

3. The novel urea pipe as claimed in claim 2, wherein the reinforcement layer (13) comprises a braided wire layer (131), and the braided wire layer (131) is formed by cross-braiding aramid wires or polyester fibers; the braided wire layer (131) is braided with a wire hole (133).

4. The novel urea pipe as claimed in claim 1, wherein the number of the conducting wires (12) is two, the two conducting wires (12) are mutually wound along the direction of the central line, and at any section, the two conducting wires (12) are arranged in a central symmetry manner relative to the urea pipe (1).

5. The urea pipe according to claim 4, wherein the conducting wire (12) is externally arranged on the protective layer (15).

6. The novel urea pipe as claimed in claim 1, wherein the urea pipe (1) is further connected with a quick coupling (2), and the quick coupling (2) comprises a coupling body (21) and a plug portion (22) integrally formed with the coupling body (21).

7. The urea pipe according to claim 6, wherein the plug portion (22) comprises a first connecting portion (221) in the shape of a circular truncated cone, a second connecting portion (222) integrally formed with the joint body (21), and an intermediate connecting portion (223) for connecting the first connecting portion and the second connecting portion.

8. The novel urea pipe as claimed in claim 7, wherein the second connecting portion (222) is provided with an annular boss (224), and an annular groove matched with the annular boss (224) is formed at the end of the urea pipe (1) connected with the quick coupling (2).

9. The urea pipe according to claim 8, wherein a ferrule (23) is further provided at the junction of the quick coupling (2) and the urea pipe (1).

10. Process for the production of a new urea pipe according to any one of claims 1 to 9, characterized by the fact that it comprises the following steps: putting the inner layer material into an extruder, inserting the core of the extruder into the inner tube to extrude the inner layer tube, weaving the rear reinforcing layer outside the inner layer tube, winding the wire layer outside the strong wire layer, finally coating the outer layer, vulcanizing, depoling, cleaning, pressurizing and discharging water stain on the inner wall of the rubber tube to obtain the urea tube, and packaging the urea tube into a finished product after inspection.