JP2014048333A - Holder for fiber endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a holder for a fiber endoscope capable of holding and fixing the fiber endoscope while sealing a closed space in a high-pressure environment.SOLUTION: A holder for a fiber endoscope includes: a body 20 which has a through hole 21 through which a fiber endoscope 80 penetrates and a recess 23 communicating with the through hole 21, and is fixed to a wall 90; a cotter 40 which has a through hole 41 through which the fiber endoscope 80 penetrates and is inserted into the recess 23; a pressing member 30 having a through hole 31 through which the fiber endoscope 80 penetrates and a pressing part 32 to be fitted into the recess 23. When the cotter 40 is inserted in the recess 23 and the pressing part 32 is fitted into the recess 23, the cotter 40 is interposed between the pressing member 30 and a side end part of the through hole 21 of the recess 23, and the fiber endoscope 80 penetrates the through holes 21, 31, and 41. When the pressing member 30 is pressed into the through hole 21 side of the recess 23, the cotter 40 is pressed by the body 20, thereby the through hole 21 is sealed.

Description

  The present invention relates to a technique for a holder of a fiber endoscope.

  In the fiber endoscope, a lens is provided at the tip of an optical fiber, and an image captured from the lens is transmitted by the fiber. Although the fiber endoscope is used in the medical field in many cases, it is also used for observing the inside of a structure that is difficult to observe directly in the industrial field (for example, Patent Document 1).

  In the development of automobile engines, performance prediction by CAE (Computer Aided Engineering) is performed in order to speed up development. In the performance prediction by CAE, the correlation with the actual experimental result needs to be clear. For example, in order to perform CAE analysis inside the engine fuel pump, it is necessary to observe the actual valve behavior inside the engine fuel pump using a fiber endoscope.

  When a narrow space in a high pressure environment such as the inside of a fuel pump of an engine is observed with a fiber endoscope, it is necessary to hold and fix the fiber endoscope while sealing the narrow space in a high pressure environment. However, the conventional technology of the fiber endoscope represented by Patent Document 1 does not disclose a configuration for holding and fixing the fiber endoscope while sealing a narrow closed space in a high-pressure environment.

JP 2011-130854 A

  The problem to be solved by the present invention is to provide a fiber endoscope holding tool capable of holding and fixing a fiber endoscope while sealing a narrow closed space in a high pressure environment.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, in claim 1, a fiber-type endoscope holding tool for holding and fixing the fiber-type endoscope to the wall of the narrow space, a through-hole through which the fiber-type endoscope passes, A recess formed in communication with the through hole, and a main body fixed to the wall; a through hole through which the fiber endoscope is formed; and an elastic member inserted into the recess of the main body; A push-in member formed with a through-hole through which the fiber endoscope passes and a convex portion fitted into the concave portion of the main body, and the elastic member is inserted into the concave portion of the main body When the convex part of the pushing member is fitted into the concave part, the elastic member is interposed between the pushing member and the through hole side end of the main body in the concave part, and the pushing member and the elastic body , And the respective through holes of the main body Serial fiber endoscope penetrates, by the pushing member is pushed into the through-hole side of the recess, the elastic member is pressed to the body, the through hole of the body is intended to be sealed.

  In Claim 2, It is a holder of the fiber type endoscope of Claim 1, Comprising: As for the recessed part of the said main body, the through-hole side edge part of the said main body is a taper shape toward the through-hole side of the said main body. The elastic member is formed such that a through hole side end portion of the main body in a state of being inserted into the recess is tapered toward the through hole side of the main body, and the tapered shape of the elastic member is The taper angle of the portion is formed smaller than the taper angle of the tapered portion in the concave portion of the main body, and the outer diameter of the elastic member on the side of the through hole of the main body is smaller than the inner diameter of the through hole of the main body. Is formed.

  According to a third aspect of the present invention, in the fiber endoscope holding tool according to the first or second aspect, the convex portion of the push-in member is screwed and fitted into the concave portion of the main body, and the fiber The part inserted into the through hole of the elastic member in the type endoscope is covered with a protective tube that protects the fiber type endoscope.

  According to the fiber endoscope holder of the present invention, the fiber endoscope can be held and fixed while sealing a narrow space in a high pressure environment.

The schematic diagram which showed the whole structure of the workpiece | work behavior analysis system. The schematic diagram which showed the structure of the holder.

The configuration of the workpiece behavior analysis system 100 will be described with reference to FIG.
In addition, in FIG. 1, the workpiece | work behavior analysis system 100 is represented typically. Moreover, the broken line of FIG. 1 represents the electric signal line. Furthermore, the lens R is enlarged and shown in the upper part of FIG.

  The workpiece behavior analysis system 100 is a system that observes and analyzes the behavior of the workpiece W in the narrow space S, and includes the holder 10 that is an embodiment of the holder for the fiber endoscope according to the present invention. . The workpiece behavior analysis system 100 further includes a controller 50, a high-speed camera 60, a light source 70, and a fiber endoscope 80.

The holder 10 will be described in detail later.
The narrow space S is enclosed and sealed by the wall 90, and is exposed to a high-pressure environment. The workpiece W is disposed in the narrow space S. The narrow space S of the present embodiment is inside the fuel injection pump of the engine. Further, the workpiece W of the present embodiment is a valve inside the fuel injection pump.

  The fiber endoscope 80 is provided with a lens R at the tip of a fiber F composed of an optical fiber, and transmits an image captured from the lens R through the fiber F. The fiber F is composed of a linear member having a core and a clad and having flexibility. The lens R is bonded to the end of the fiber F with a heat-resistant adhesive B1. The tip of the fiber F is held by the wall 90 by the holder 10 and faces the narrow space S.

The high-speed camera 60 captures an image transmitted through the fiber F. The high-speed camera 60 is connected to the controller 50 and the fiber endoscope 80.
The light source 70 emits light to the lens R through the fiber F. The light source 70 is connected to the controller 50 and the fiber endoscope 80.

  The controller 50 adjusts imaging conditions such as the amount of light emitted from the light source 70 and the shooting speed of the high-speed camera 60. The controller 50 is connected to the high speed camera 60 and the light source 70.

The configuration of the holder 10 will be described with reference to FIG.
In FIG. 2, the holder 10 is schematically shown in partial cross-sectional view. Further, in the lower part of FIG. 2, the middle part and the tapered part 42 of the cotter 40 are shown enlarged. Hereinafter, the direction in which the holder 10 is inserted into the wall 90 will be referred to as the pressing direction, the side toward the narrow space S in the pressing direction will be referred to as the inside, and the side from the narrow space S to the outside in the pressing direction will be referred to as the outside.

  The holder 10 is an embodiment of the holder of the fiber endoscope of the present invention. The holder 10 holds and fixes the fiber F of the fiber endoscope 80 to the wall 90 of the narrow closed space S. The holder 10 includes a main body 20, a pushing member 30, and a cotter 40 as an elastic body.

  The main body 20 is inserted into the wall 90 of the narrow space S and fixed directly. The main body 20 is formed in a substantially cylindrical shape, and has a through hole 21, a mounting portion 22, and a recess 23.

The through hole 21 is a hole through which the fiber F is inserted. The through hole 21 is formed through the substantially central portion of the main body 20 along the axial direction, and has a diameter large enough to pass through the fiber F. Yes.
The attachment portion 22 is a portion fixed to the wall 90 of the narrow space S, and is formed in a substantially cylindrical shape having a smaller diameter than the outer portion of the main body 20 at the inner portion in the pushing direction of the main body 20. A male screw portion is formed on the outer peripheral surface of the attachment portion 22.

  The concave portion 23 is formed inward from the outer end portion in the pushing direction of the main body 20, and communicates with the through hole 21. A female screw portion 23 </ b> B is formed on the inner peripheral surface of the recess 23. The inner end portion in the pushing direction of the concave portion 23 is formed with a tapered portion 23A that is tapered toward the narrow closed space S side. Here, the taper angle of the taper portion 23A in the cross-sectional view in the pushing direction is defined as a first angle α1.

  The pushing member 30 is pushed into the recess 23 of the main body 20. The pushing member 30 is formed in a substantially columnar shape, and a through hole 31 and a pushing portion 32 are formed.

The through hole 31 is a hole through which the fiber F is inserted. The through hole 31 is formed through the substantially central portion of the pushing member 30 in the axial direction and has a diameter large enough to allow the fiber F to be inserted. .
The push-in portion 32 is a convex portion that is fitted into the concave portion 23 of the main body 20, and is formed in an inner portion in the push-in direction of the push-in member 30. A male screw portion is formed on the outer peripheral surface of the pushing portion 32. The pushing member 30 is pushed into the concave portion 23 of the main body 20 by screwing the male screw portion of the pushing portion 32 and the female screw portion 23 </ b> B of the concave portion 23.

  The cotter 40 is inserted into the recess 23 of the main body 20 and seals the through hole 21 of the main body 20. In a state where the cotter 40 is inserted into the recess 23 of the main body 20, the pushing member 30 and the recess 23 are screwed together. Thereby, the cotter 40 is interposed between the pushing member 30 and the tapered portion 23 </ b> A formed at the end portion of the concave portion 23 on the through hole 21 side. The cotter 40 is made of an elastic member such as rubber and has a substantially cylindrical shape. The cotter 40 is formed with a through hole 41 and a tapered portion 42.

  The through hole 41 is a hole through which the fiber F is inserted. The through hole 41 is formed through the substantially central portion of the cotter 40 in the axial direction, and is large enough for the fiber F with the protective tube 43 attached to pass therethrough. It is formed in the diameter. The tapered portion 42 is formed to be tapered toward the inside at the inner end portion in the pushing direction of the cotter 40. Here, let the taper angle of the taper part 42 in the cross sectional view of the pushing direction be 2nd angle (alpha) 2. The second angle α2 is a sufficiently smaller angle than the first angle α1 described above. In addition, the outer diameter of the inner end (through hole 21 side end) of the cotter 40 is formed to be smaller than the inner diameter of the through hole 21.

  The protective tube 43 covers the portion of the outer peripheral surface of the fiber F that is inserted into the through hole 41 of the cotter 40 to protect the fiber F. The protective tube 43 is formed in a cylindrical shape. The protective tube 43 is attached to the protective tube 43 by adhering to the outer peripheral surface of the fiber F with an adhesive B2. In a state where the fiber F is inserted into the through hole 41 of the cotter 40, the protective tube 43 is interposed between the through hole 41 and the fiber F. An uneven shape is formed on the outer peripheral surface of the protective tube 43.

  The metal plate 45 is interposed between the pushing member 30 and the cotter 40, and presses the cotter 40 as the pushing member 30 is pushed into the recess 23. The metal plate 45 is formed in a cylindrical shape, and a through hole 46 is formed in the substantially central portion along the axial direction. The through hole 46 is a hole through which the fiber F is inserted.

The attachment of the holder 10 and the operation of the holder 10 will be described.
When attaching the holder 10 to the wall 90 of the narrow space S, first, the protective tube 43 is attached to a predetermined position of the fiber F by bonding. When the fiber F is attached to the wall 90 by the holder 10, the insertion amount of the fiber F into the narrow closed space S is set so that the work W falls within the photographing range of the lens R. The position is a portion that penetrates the cotter 40 of the holder 10 on the outer peripheral surface of the fiber F when the fiber F is attached to the wall 90.

  Next, the fiber F is inserted through the cotter 40 so that the protective tube 43 attached to the fiber F and the cotter 40 overlap. Before the fiber F is inserted into the cotter 40, the pushing member 30 and the metal plate 45 are inserted into the fiber F in advance.

  Next, the fiber F through which the cotter 40 is inserted is inserted into the through hole 21 of the main body 20 from the lens R side. Thereby, the cotter 40 is inserted into the recess 23 of the main body 20. Then, the metal plate 45 and the pushing member 30 that have been inserted through the fiber F in advance are moved from the outside of the main body 20 to the recess 23 side, and the metal plate 45 is inserted into the recess 23 and the pushing member 30 is inserted into the recess 23. Screw together. In this state, the pushing member 30, the metal plate 45, and the cotter 40 are located in the recess 23 in order from the outside to the inside. Further, the pushing member 30 screwed into the main body 20 is tightened with a predetermined torque.

  When the pushing member 30 is tightened inward in the pushing direction, the metal plate 45 is pushed in the pushing direction by the pushing member 30. When the metal plate 45 is pushed in the pushing direction, the cotter 40 is pushed in the pushing direction.

  When the cotter 40 is pressed in the pressing direction, the cotter 40 is pressed against and closely adheres to the portion of the main body 20 where the through hole 21 is formed. When the cotter 40 comes into close contact with the portion of the main body 20 where the through hole 21 is formed, the through hole 21 of the main body 20 is sealed.

  In particular, in the present embodiment, the cotter 40 is formed with a tapered portion 42, the concave portion 23 is formed with a tapered portion 23 </ b> A, and the outer diameter of the inner end (end of the through hole 21) of the cotter 40 is the through hole 21. Since the cotter 40 is pressed in the pushing direction, the tapered portion 42 of the cotter 40 is pressed against the boundary portion between the tapered portion 23 </ b> A of the main body 20 and the through hole 21. Therefore, the degree of adhesion between the cotter 40 and the portion where the through hole 21 is formed in the main body 20 is increased, and the sealing performance of the through hole 21 of the main body 20 is improved.

  At the same time, when the tapered portion 42 of the cotter 40 is pressed against the boundary portion, the cotter 40 is compressed in the pushing direction between the boundary portion and the metal plate 45, and the diameter of the through hole 41 of the cotter 40 is reduced. To do. As a result, the inner peripheral surface of the through hole 41 is pressed against the outer peripheral surface of the protective tube 43 attached to the fiber F, and the inner peripheral surface of the through hole 41 and the outer peripheral surface of the protective tube 43 are brought into close contact with each other. The through hole 41 is sealed.

  In this case, since the concavo-convex shape is formed on the outer peripheral surface of the protective tube 43, the concavo-convex shape bites into the inner peripheral surface of the through hole 41, and the outer peripheral surface of the protective tube 43 and the inner peripheral surface of the through hole 41 An anchor effect is exerted between. Thereby, the close_contact | adherence degree of the internal peripheral surface of the through-hole 41 and the outer peripheral surface of the protective tube 43 can be improved, and the sealing performance of the through-hole 41 of the cotter 40 is improved.

  Finally, a sealing tape is wound around the mounting portion 22 of the main body 20, and the mounting portion 22 wound with the sealing tape is fastened to the wall 90 of the confined space S that has been previously threaded, so that the fiber F and the holder 10 are closed. It is held and fixed to the wall 90 of the space S.

The effect of the holder 10 will be described.
According to the holder 10, the fiber F of the fiber endoscope 80 can be held and fixed while sealing the narrow space S in a high-pressure environment.

DESCRIPTION OF SYMBOLS 10 Holder 20 Main body 21 Through-hole 30 Push-in member 31 Through-hole 32 Push-in part 40 Cotter 41 Through-hole 42 Tapered part 43 Protection tube 45 Metal plate 80 Fiber type endoscope 100 Work behavior analysis system

Claims (3)

A fiber endoscope holder for holding and fixing a fiber endoscope on a wall of a narrow space,
A through-hole through which the fiber endoscope penetrates, and a recess communicating with the through-hole, and a main body fixed to the wall;
A through-hole through which the fiber endoscope passes is formed, and an elastic member inserted into the recess of the main body,
A push-in member formed with a through-hole through which the fiber endoscope penetrates and a convex part fitted into the concave part of the main body;
Comprising
The elastic member is inserted into the concave portion of the main body, and the convex portion of the push-in member is fitted into the concave portion, so that between the push-in member and the end portion on the through hole side of the main body in the concave portion. The elastic member intervenes,
The fiber endoscope passes through the through-holes of the push-in member, the elastic body, and the main body,
When the pushing member is pushed into the through hole side of the concave portion, the elastic member is pressed against the main body, and the through hole of the main body is sealed.
Fiber endoscope holder. A holder for a fiber endoscope according to claim 1,
The concave portion of the main body has a through hole side end portion of the main body formed in a tapered shape toward the through hole side of the main body,
The elastic member is formed such that a through hole side end of the main body in a state of being inserted into the concave portion is tapered toward the through hole side of the main body,
The taper angle of the tapered portion of the elastic member is
It is formed smaller than the taper angle of the tapered portion in the concave portion of the main body,
The outer diameter of the elastic member on the side of the through hole of the main body is formed smaller than the inner diameter of the through hole of the main body.
Fiber endoscope holder. A holder for a fiber endoscope according to claim 1 or 2,
The convex portion of the pushing member is screwed into and fitted into the concave portion of the main body,
The portion that is inserted into the through hole of the elastic member in the fiber endoscope is covered with a protective tube that protects the fiber endoscope.
Fiber endoscope holder.

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