Double-layer differential pressure pipe of EGR (Exhaust Gas Recirculation) system

Abstract

The utility model relates to an EGR system double-layer differential pressure pipe, which comprises a pipe body, and is characterized in that the pipe body comprises an inner pipe and an outer pipe coated on the inner pipe, the inner pipe is an FKM rubber pipe, and the outer pipe is an AEM rubber pipe. The composite structure of the FKM rubber pipe and the AEM rubber pipe is adopted, so that the differential pressure hose has excellent acetic acid corrosion resistance, and meanwhile the cost of the differential pressure hose is greatly reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of pipe material, in particular to a double-layer differential pressure pipe of EGR system. BACKGROUND

[0002] In recent years, the requirement of differential pressure hose in different parts of EGR system is more and more. In recent years, with the promotion of ethanol gasoline, organic acid is produced in exhaust gas, which makes the differential pressure hose in EGR system not only require high temperature resistance, reduce oil and gas permeation, and increase the requirement of acetic acid resistance.

[0003] But the existing ordinary EGR hose does not have the performance of preventing acetic acid, which makes the EGR hose be eroded and damaged by acetic acid after a period of use, so that the gas leaks, which cannot meet the use requirement of the existing EGR system of automobile. INVENTION CONTENTS

[0004] The application provides a double-layer differential pressure pipe of EGR system, which adopts FKM rubber pipe+AEM rubber pipe composite structure, so that the differential pressure hose has excellent acetic acid corrosion resistance and greatly reduces the cost of differential pressure pipe.

[0005] The double-layer differential pressure pipe of EGR system provided by the application adopts the following technical scheme:

[0006] A double-layer differential pressure pipe of EGR system, comprising a pipe body, characterized in that: the pipe body comprises an inner pipe and an outer pipe wrapped on the inner pipe, the inner pipe is a FKM rubber pipe, and the outer pipe is an AEM rubber pipe.

[0007] By adopting the above technical scheme, the FKM rubber pipe+AEM rubber pipe composite structure is adopted, so that the differential pressure hose has excellent acetic acid corrosion resistance and greatly reduces the cost of differential pressure pipe.

[0008] Preferably, the inner pipe is a bisphenol vulcanized FKM rubber pipe.

[0009] By adopting the above technical scheme, the price of bisphenol vulcanized FKM rubber pipe is about 40% lower than that of peroxide vulcanized FKM rubber pipe, and the use of bisphenol vulcanized FKM rubber pipe can reduce the cost of differential pressure pipe while ensuring the acetic acid corrosion resistance of the pipe body.

[0010] Preferably, the surface of the outer pipe is sleeved with a glass fiber braided pipe.

[0011] By adopting the above technical scheme, the wear resistance of the pipe body is improved.

[0012] Preferably, the two ends of the pipe body are outwardly folded to form flared folding parts, and a connecting head is arranged on the folding part.

[0013] By adopting the technical scheme, the differential pressure pipe is conveniently connected with the engine and other components, and meanwhile, the connection firmness of the hose and the connector is ensured.

[0014] Preferably, the connector comprises a first head body, a second head body and a connecting portion, the first head body and the second head body are respectively located on two sides of the folded portion, and the connecting portion is used for connecting the first head body and the second head body so that the first head body and the second head body clamp the folded portion.

[0015] By adopting the technical scheme, the connection and disconnection of the connector and the pipe body are facilitated.

[0016] Preferably, the connecting portion comprises a bolt and a nut, the bolt penetrates through the first head body, the folded portion and the second head body, and the nut is matched with the bolt.

[0017] By adopting the technical scheme, the folded portion is placed between the first head body and the second head body, and then the first head body and the second head body are connected together by the bolt and the nut, so that the first head body and the second head body clamp the folded portion.

[0018] Preferably, the first head body extends into the inside of the pipe body and is matched with the inner wall of the pipe body, and the second head body wraps and matches the entire folded portion and part of the pipe body.

[0019] By adopting the technical scheme, the connection firmness of the first head body and the second head body is improved.

[0020] Preferably, the end portion of the pipe body and the folded portion are both provided with a ceramic wear-resistant layer.

[0021] By adopting the technical scheme, the wear-resistant performance of the folded portion and the end portion of the pipe body is improved, so that the wear of the connection part of the folded portion and the first head body and the second head body is prevented, and the service life of the pipe body is improved.

[0022] Preferably, a plurality of annular protrusions are arranged on the side walls on two sides of the folded portion, and a plurality of annular grooves for clamping and matching the annular protrusions are arranged on the first head body and the second head body.

[0023] By adopting the technical scheme, the connection firmness of the folded portion and the first head body and the second head body is further improved.

[0024] Preferably, a containing groove is arranged on the side of the second head body facing the first head body, the folded portion is located in the containing groove, and the plurality of annular grooves arranged on the second head body are arranged on the bottom wall in the containing groove.

[0025] By adopting the technical scheme, the connection and assembly of the connector, the folded portion and the pipe body are facilitated.

[0026] The technical effects of the utility model mainly lie in the following aspects:

[0027] 1、The utility model discloses a FKM rubber pipe + AEM rubber pipe composite structure, which makes the differential pressure hose have excellent acetate corrosion resistance and greatly reduces the cost of the differential pressure pipe.

[0028] 2、The utility model discloses a bisphenol vulcanized FKM as the inner tube material to reduce the product cost.

[0029] 3、The utility model discloses a connector, which facilitates the connection of the differential pressure pipe with engine parts and ensures the firmness of the connection between the hose and the connector. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is the structure diagram of one end of the differential pressure pipe.

[0031] Figure 2 It is Figure 1 The local enlarged view of A in the figure.

[0032] Reference signs: 1, pipe body; 2, inner tube; 3, outer tube; 4, glass fiber braided tube; 5, folded part; 51, annular lug; 6, connector; 61, first head; 611, accommodating groove; 62, second head; 7, connecting part; 71, bolt; 72, nut; 8, ceramic wear-resistant layer; 9, annular groove. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings Figure 1 and the drawings Figure 2 The application will be further described in detail to make the technical scheme of the application easier to understand and master.

[0034] The double-layer differential pressure pipe of the EGR system includes a pipe body 1, which includes an inner tube 2 and an outer tube 3 covering the inner tube 2. The inner tube 2 is a bisphenol vulcanized FKM rubber pipe, and the outer tube 3 is an AEM rubber pipe. The surface of the outer tube 3 is sleeved with a glass fiber braided tube 4. The FKM + AEM composite structure makes the differential pressure hose have excellent acetate corrosion resistance and greatly reduces the cost of the differential pressure pipe.

[0035] The two ends of the pipe body 1 are outwardly folded to form flared folded parts 5, and two annular lugs 51 are integrally formed on the folded parts 5. Two annular lugs 51 are integrally formed on the side walls of the folded parts 5. The end part of the pipe body 1 and the folded parts 5 are soaked in a ceramic coating solution after production to form a ceramic wear-resistant layer 8 on the surfaces thereof.

[0036] The connection head 6 comprises a first head body 61 and a second head body 62. The first head body 61 and the second head body 62 are respectively located at two sides of the folded part 5. The first head body 61 extends into the interior of the pipe body 1 and is attached to the inner wall of the pipe body 1, and the second head body 62 wraps and is attached to the entire folded part 5 and part of the pipe body 1. A containing groove 611 is formed on the side of the second head body 62 facing the first head body 61, and the folded part 5 is located in the containing groove 611. Two annular grooves 9 are formed on the bottom wall of the containing groove 611 and are matched with the annular protrusions 51. Two annular grooves 9 are also formed on the side of the first head body 61 facing the second head body 62 and are matched with the annular protrusions 51.

[0037] The connection head 6 further comprises a plurality of connecting parts 7 for connecting the first head body 61 and the second head body 62 so that the first head body 61 and the second head body 62 clamp the folded part 5. The connecting part 7 comprises a bolt 71 and a nut 72. The bolt 71 penetrates the first head body 61, the folded part 5 and the second head body 62, and the nut 72 is matched with the bolt 71.

[0038] When the connection head 6 is matched with the pipe body 1, first, the second head body 62 is sleeved on the outside of the folded part 5 and the pipe body 1, the folded part 5 is located in the containing groove 611, and the two annular protrusions 51 on the same side wall are matched into the two annular grooves 9 on the second head body 62.

[0039] Then, the first head body 61 is inserted into the pipe body 1 so that the first head body 61 and the second head body 62 clamp the folded part 5. The clamping part of the first head body 61 is pressed in the fusion groove, and the two annular protrusions 51 on the other side wall are matched into the two annular grooves 9 on the first head body 61. Then, a plurality of bolts 71 are sequentially inserted through the first head body 61, the folded part 5 and the second head body 62, and a plurality of nuts 72 are screwed onto the plurality of bolts 71 to complete the clamping and fixing of the folded part 5 by the first head body 61 and the second head body 62.

[0040] Of course, the above is only a typical example of the present application, and in addition to this, the present application can have other various specific embodiments. Any technical solution formed by equivalent replacement or equivalent transformation falls within the scope of the present application.

Claims

1. An EGR system double-layer differential pressure pipe comprising a pipe body (1), characterized in that: The pipe body (1) comprises an inner pipe (2) and an outer pipe (3) covering the inner pipe (2), the inner pipe (2) is an FKM rubber pipe, and the outer pipe (3) is an AEM rubber pipe; both ends of the pipe body (1) are outwardly folded to form a flared folding portion (5), and a connecting head (6) is arranged on the folding portion (5); the connecting head (6) comprises a first head body (61), a second head body (62) and a connecting portion (7), the first head body (61) and the second head body (62) are respectively located on both sides of the folding portion (5), and the connecting portion (7) is used for connecting the first head body (61) and the second head body (62) so that the first head body (61) and the second head body (62) clamp the folding portion (5); the first head body (61) extends into the inner pipe (2) and is attached to the inner wall of the pipe body (1), and the second head body (62) wraps and attaches to the entire folding portion (5) and part of the pipe body (1).

2. An EGR system dual differential pressure tube according to claim 1, wherein: The inner pipe (2) is a bisphenol vulcanized FKM rubber pipe.

3. An EGR system dual differential tube as in claim 1, wherein: The surface of the outer pipe (3) is sleeved with a glass fiber woven pipe (4).

4. The dual-layer differential pressure tube for an EGR system of claim 1, wherein: The connecting portion (7) comprises a bolt (71) and a nut (72), the bolt (71) penetrates the first head body (61), the folding portion (5) and the second head body (62), and the nut (72) is matched with the bolt (71).

5. The dual-layer differential pressure tube for an EGR system of claim 1, wherein: The end portion and the folding portion (5) of the pipe body (1) are both provided with a ceramic wear-resistant layer (8).

6. An EGR system dual differential tube as in claim 1, wherein: The two side walls of the folding portion (5) are both provided with a plurality of annular protrusions (51), and the first head body (61) and the second head body (62) are both provided with a plurality of annular grooves (9) for clamping the annular protrusions (51).

7. An EGR system dual differential tube as in claim 6, wherein: The second head body (62) is provided with a containing groove (611) on one side facing the first head body (61), the folding portion (5) is located in the containing groove (611), and the plurality of annular grooves (9) on the second head body (62) are arranged on the bottom wall in the containing groove (611).

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