JPH11165138A - Apparatus for cleaning outer circumferential face of long material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To evenly and uniformly clean the whole surface of the outer circumferential face of a long material including a high pressure fuel jetting pipe, make the cleaning state observable, recover fine foreign substances blown by a pressurized fluid, and properly regulate the blow quantity of the pressurized fluid. SOLUTION: A through hole 3 having a slightly larger diameter than that of a long material to be cleaned and smaller than an aperture part is formed in a main body 2 having the aperture part at least in the front end, a plurality of jetting out-holes 4 opened near the front end of the inside of the main body 2 and inclined at least in the peripheral part of the aperture part in the inside and backward in relation to the center line of the through hole 3 are formed, and a circular part 5 for supplying a pressurized fluid to the jetting out holes 4 is formed in the outer circumferential part near the front end of the main body 2. The inclination angle of the jetting out holes 4 is adjusted to be within a range from 20 to 70 deg. and a bag-like filter is attached to the rear end part of the main body 2 and further a circular part 5 is installed integrally with or separately from the main body 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel injection system component constituting a fuel injection system for a diesel engine, for example, a fuel injection pipe and a common rail, an injection pipe, a feed pipe and the like for a fuel pressure accumulating system, and a general fine fuel injection system. The present invention relates to an apparatus for cleaning the outer peripheral surface of a long material such as a metal tube having a small diameter or a rod having a small diameter.

[0002]

2. Description of the Related Art A high-pressure fuel injection pipe for a diesel engine, which requires a particularly high degree of cleanliness, will be described as an example. And the injection time becomes 1
2msec, maximum flow velocity 50m / sec, internal pressure 60-14
It is beginning to be required to inject fuel at a high pressure of 00 bar (peak value).

[0003] With such a change in market demand, when minute foreign matter such as metal powder, organic matter, oil or fat which floats in the air or invades from the outside adheres to the inner surface of the high-pressure fuel injection pipe, the injection nozzle of the injection nozzle becomes inoperable. Clogging may occur, resulting in malfunctions of the diesel engine or damage to the fuel pump.Therefore, it is necessary to purify these adhered and penetrated minute foreign matters to improve the cleanliness of the inner surface of the high-pressure fuel injection pipe. This is a major issue.

In order to solve such a problem, the applicant of the present invention disclosed in Japanese Patent Application No. 8-177,074, a fine foreign substance dissolving solution made of an acid, an alkali or an organic solvent was passed through the inner peripheral surface after the final drawing step. A method for manufacturing a clean high-pressure fuel injection pipe was proposed. According to the manufacturing method according to this proposal, the inner peripheral surface of the obtained high-pressure fuel injection pipe was remarkably cleaned, and a product having almost satisfactory cleanliness of the inner peripheral surface could be obtained.

[0005]

However, when the high-pressure fuel injection pipe obtained by the above-mentioned manufacturing method was examined in more detail, it was found that an unexpected minute foreign matter was present. As a result of various studies and researches by the present applicant on such minute foreign matter, the high-pressure fuel injection pipe obtained by the above-mentioned proposed method was bundled during transportation to an actual assembly site or during storage. It was found that metal powder generated by fuel injection pipes interfering with each other or fine foreign matters floating in the air adhere to the outer peripheral surface, and reduce the cleanliness of the high-pressure fuel injection pipe as a whole. . Particularly in the case of a high-pressure fuel injection pipe, minute foreign matter present on the end face of the connection head or the seat surface moves into the high-pressure fuel injection pipe and causes clogging of the injection nozzle, thereby causing malfunction of the diesel engine or fuel pump. It is impossible to overlook it because of the possibility of breakage.

[0006] The cleaning of the outer peripheral surface, which is currently generally performed, is performed by rotating a high-pressure fuel injection pipe held by an operator with an air gun held by one hand while rotating the high-pressure fuel injection pipe held by the other hand. High pressure air is blown to clean, but because it is a manual operation, it is difficult to spray high pressure air evenly on the entire outer peripheral surface. And there is no means to confirm that the outer peripheral surface has been uniformly cleaned, and the fine foreign matter scattered by the air gun is randomly scattered and its collection is difficult.
Furthermore, the air volume of the high-pressure air discharged from the air gun was constant and could not be expected to increase or decrease.

Accordingly, the present invention cleans the entire outer peripheral surface of the long material including the high-pressure fuel injection pipe uniformly without unevenness, can confirm the state of the cleaning, and can remove minute foreign matters blown off by the pressurized fluid. It is an object of the present invention to provide an apparatus for cleaning the outer peripheral surface of a long material, which can appropriately increase or decrease the air volume of the pressure fluid, particularly before cleaning the inner surface by the method described above. Another object of the present invention is to provide an apparatus for cleaning the outer peripheral surface of the high-pressure fuel injection pipe with a pressure fluid after the cleaning process or before and after the cleaning process.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a main body having an opening at least at a front end, the main body having a diameter slightly larger than a long material to be cleaned and smaller than the opening. A plurality of discharge holes having a through hole, opening near the front end inside the main body, and being inclined inward and rearward at least near the opening with respect to the center line of the through hole, An annular portion for supplying a pressure fluid to the discharge hole is provided on an outer peripheral portion near the front end of the main body, and the inclination angle of the discharge hole is 20 ° to
It is a range of 70 °, a bag-shaped filter is attached to the rear end of the main body, and the cleaning device for cleaning the outer peripheral surface of a long material in which the annular portion is provided integrally with or separately from the main body. .

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be described in more detail hereinafter with reference to the accompanying drawings. FIG. 1 is a schematic sectional view of an apparatus for cleaning an outer peripheral surface of a long material according to one embodiment of the present invention, FIG. 2 is an enlarged half cutaway view of a main part showing another embodiment of the present invention, and FIG. FIG. 2 is a schematic side view showing another embodiment, wherein 1 is a high-pressure fuel injection pipe as a long material to be cleaned, 2 is a main body, 3 is an axially penetrating inside the main body, and the high-pressure fuel injection is performed. A through hole 4 slightly larger in diameter than the pipe 1 is formed near the front end of the main body 2 so as to be inclined inward and rearward with respect to the center line of the through hole 3, and opens into the through hole 3. The plurality of discharge holes 5 are annular portions disposed on the outer peripheral portion near the front end of the main body 2 for supplying a pressure fluid such as pressurized air to the discharge holes.

In the present invention, the front end of the main body 2 has a frusto-conical tapered portion 3 which expands to the front end side communicating with the through hole 3 in order to facilitate introduction of external air and introduction of the high-pressure fuel injection pipe 1. -1, having an opening having a larger diameter than the through hole;
On the other hand, at the rear end of the main body 2, an opening which expands in a reverse frusto-conical shape communicating with the through hole 3 in order to make the flow of the pressure fluid smooth and facilitate the discharge of the blown fine foreign matter. Has a tapered portion 3-2 and is formed so as to be larger in diameter than the through hole. In addition, the above-described taper portion 3-
Although the shapes 1 and 3-2 are shown as truncated cones, they may be formed in a bell shape or a trumpet shape.

In this embodiment, the inner diameter of the through hole 3 is a connecting head 1-1 formed at one end of the high-pressure fuel injection pipe 1.
Is formed to be slightly larger than the outer diameter of the through hole 3, and an annular minute gap is held between the outer diameter of the through hole 3 and the inner peripheral surface. The distance of the minute gap varies depending on the outer diameter of the target long material, but is preferably about 0.5 mm to 5 mm because an eject effect is generated in the pressure fluid to further increase the flow velocity. For example, in the case of the high pressure fuel injection pipe 1 having an outer diameter of the connection head of 11 mm, the maximum inner diameter of the inlet of the tapered portion 3-1 on the front end side is set to 16 mm, and the inner diameter of the through hole 3 is formed to 13 mm. The minute gap is 1 mm. However, in the case of a long material in which such a connection head is not formed, the diameter may be slightly larger than the outer diameter of the long material itself.

The discharge hole 4 opening in the through hole 3 is formed by being inclined at a constant angle inward and rearward with respect to the center line of the through hole 3, and is provided with a high pressure fuel injection pipe. The angle is less than 90 °, preferably from 20 ° to 70 °, and most preferably from 30 ° to 60 °, in order to blow back the minute foreign matter adhering to the outer peripheral surface of No. 1. The inner diameter and the number of the discharge holes 4 vary depending on the outer diameter of a long material to be cleaned, but in the case of the illustrated high-pressure fuel injection pipe, the diameter of the discharge holes is 1 to 2.5 mm, preferably 1.5 to 2.5 mm. ２2 mm, and 4 to 7, preferably 5 to 6 are pierced at equal intervals.

Further, the discharge hole 4 may be entirely inclined from the outer peripheral surface of the main body 2 to the opening to the through hole 3 as shown in FIG. 1, but at least near the opening to the through hole 3 as shown in FIG. In this case, it is necessary to incline rearward inward with respect to the center line of the opening, and it is preferable that the opening has a tapered opening 4-1 because the pressure fluid to be jetted is further pressurized.

A connection branch pipe 5-1 for connecting a pipe from a pressure fluid supply source (not shown) is provided on an annular portion 5 provided on the outer peripheral portion near the front end of the main body 2. I have.
In the embodiment of FIG. 1, the annular portion 5 is provided separately from the main body 2, and is engraved on the outer peripheral surface of the stepped reduced diameter portion 2-1 provided on the outer peripheral portion near the front end of the main body 2. The lock nut 6 screwed into the screw 2-2 abuts and is fixed to the stepped portion, and the inner peripheral surface of the annular portion 5 and the reduced-diameter portion 2 in order to prevent leakage of the supplied pressure fluid. -1 and a seal ring member 7 interposed therebetween.

However, it is not always necessary to form the annular portion 5 separately from the main body 2 as shown in FIG. 1, but it can be formed integrally with the main body 2 as shown in FIG.

Further, according to the present invention, it is possible to prevent the minute foreign matter blown off by the pressure fluid ejected from the discharge hole at the rear end of the main body 2 from diffusing to the outside and contaminating the environment, and to remove the minute foreign matter as necessary. In order to confirm the degree of cleaning of the outer peripheral surface by collecting and measuring the number thereof, it is preferable to attach the bag-shaped filter 8 with the fastener 9 as shown in FIG.

The operation of the present invention constructed as described above will be described. First, the bag-shaped filter 8 is attached to the rear end of the main body 2 by the fastener 9, and then the pressurized fluid is supplied to the annular portion 5 to discharge the outlet hole. 4, a high-pressure fuel injection pipe 1 is ejected from the high-pressure fuel injection pipe 1 having a size of about 5 kgf / cm ^2. And the high-pressure fuel injection pipe 1 is reciprocated (while rotating if necessary) in the through-hole 3. Preferably, the reciprocating movement is repeated several times.

At this time, the connection head 1 of the high-pressure fuel injection pipe 1
A large amount of air is sucked from the opening at the front end of the main body 1 by an ejecting effect due to the ejection of the pressure fluid in the oblique direction due to the inclination of the discharge hole 4 and the annular minute gap generated between the inner peripheral surface of the main body 1 and the through hole 3. The pressure fluid which has been merged and jetted from the discharge hole 4 further increases the flow rate, collides with high kinetic energy to the minute foreign matter adhered to the outer peripheral surface of the high-pressure fuel injection pipe 1, and separates the fine foreign matter, so that the minute foreign matter is more effectively. It is removed and finally captured by the bag-shaped filter 8 attached to the rear end of the main body 2. The air volume and pressure from the pressure fluid supply source can be controlled by a control device (not shown) provided between the connection branch pipe 5-1 and the pressure fluid supply source as needed.

[0019]

As described above, according to the present invention, the entire outer peripheral surface of the long material including the high-pressure fuel injection pipe can be uniformly and uniformly cleaned, and the state of the cleaning can be confirmed. It is possible to provide an apparatus for cleaning the outer peripheral surface of a long material, which can collect the flying foreign matter and can appropriately increase or decrease the air volume of the pressurized fluid, and is particularly proposed by Japanese Patent Application No. 8-177,074. It is more effective to carry out the method for cleaning the inner surface of the high-pressure fuel injection pipe at least one of before and after the treatment with the cleaning device for the outer peripheral surface.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of an apparatus for cleaning an outer peripheral surface of a long material according to one embodiment of the present invention.

FIG. 2 is an enlarged half cutaway view of a main part showing another embodiment of the present invention.

FIG. 3 is a schematic side view showing still another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High-pressure fuel injection pipe 1-1 Connection head 2 Main body 2-1 Step-reduced diameter part 2-2 Screw 3 Through hole 3-1 and 3-2 Tapered part 4 Discharge hole 4-1 Tapered opening 5 Ring Part 5-1 Connection branch pipe 6 Lock nut 7 Seal ring member 8 Bag-shaped filter 9 Fastener

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[Procedure amendment]

[Submission date] January 8, 1998

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 2

FIG. 3

Claims (4)

[Claims] 1. A main body having an opening at least at a front end thereof, a through hole having a diameter slightly larger than that of a long material to be cleaned and a diameter smaller than the opening, and opening near a front end inside the main body. And, at least in the vicinity of the opening, a plurality of discharge holes that are inclined inward and rearward with respect to the center line of the through hole are formed, and an annular portion that supplies a pressure fluid to the discharge holes is formed in the main body. An apparatus for cleaning an outer peripheral surface of a long material, which is provided on an outer peripheral portion near a front end. 2. The inclination angle of the discharge hole is 20 ° to 70 °.
The apparatus for cleaning an outer peripheral surface of a long material according to claim 1, wherein 3. An apparatus for cleaning an outer peripheral surface of a long material according to claim 1, wherein a bag-shaped filter is attached to a rear end of said main body. 4. An apparatus for cleaning an outer peripheral surface of a long material according to claim 1, wherein said annular portion is provided integrally with or separately from said main body.