JP2009164058A - Electric conduction plug - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric conduction plug retaining airtightness and excellent in workability at assembly. <P>SOLUTION: An insulator object 3 and a metal core wire 4 are contained inside a cylindrical connection metal fitting 1, and that 1 and the core wire 4 are fixed by using a holding member 5. Both the metal fitting 1 and the core wire 4 are made of metal, and management of dimensional tolerance is comparatively easy, so that they can be surely fixed by using the holding member 5. Therefore, since assembling can be processed without using an adhesive, workability is superior and possibility of defects occurrence is reduced, and furthermore, a plug is to be in a sealed state by elastic force of the holding member 5, hence, the electric conduction plug is achieved with excellent performance in retaining airtightness. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electrically conductive plug formed by inserting a core wire through a hollow portion of an insulator.

  Conventionally, as shown in FIG. 4, the electrical conductive plug is configured by inserting a metal core wire 23 through an insulator body 21 having a hollow portion 22, and an adhesive 24 is sealed in the hollow portion 22. The body 21 and the core wire 23 are fixed.

  In addition, as an application of such an electric conduction plug, an ignition means, a flame detection means, etc. of a combustion apparatus are mentioned, but when used as an ignition means or a flame detection means, it will be exposed to a flame. The electric conductive plug is required to have high heat resistance. Therefore, it is necessary to use the adhesive 24 for fixing the insulator 21 and the core wire 23 with excellent heat resistance, and generally, an inorganic thermosetting type is used (Patent Document 1). ).

The outer periphery of the insulator body 21 is provided with a connection fitting 25 for connecting to a device such as a combustion device. The insulator body 21 and the connection fitting 25 are also fixed by sealing the adhesive 24 in the gap. Is done.
JP 2000-193239 A

  By the way, in the case where the electric conduction plug is used for a combustion apparatus or the like as described above, not only heat resistance but also airtightness is an important requirement. However, although the inorganic adhesive used for bonding is excellent in heat resistance, it has a problem that it is difficult to maintain airtightness because it is porous.

  Therefore, as a countermeasure, it is possible to maintain the airtightness of the entire plug by using a highly airtight organic adhesive at a portion where the temperature is not relatively high among a plurality of bonded portions. However, in any case, since the adhesive must be sealed and securely sealed in at least two places of the core wire and the insulator, and the insulator and the connection fitting, the workability is poor and the probability of occurrence of defects increases. There is concern.

  As another sealing method, there is a method using an O-ring. O-rings are widely used because they are excellent in airtightness and have the advantage of good workability because they do not require adhesion.

  However, the insulator used for the electric conduction plug is often made of ceramics, and since the ceramic is a fired product, an error in the size is likely to occur depending on the individual. In other words, in such a plug, there is a possibility that a defective product that cannot be sealed even if an O-ring is used may be generated. Therefore, it is ultimately necessary to rely on sealing with an adhesive.

  An object of the present invention is to solve the above-described problems, and an object thereof is to provide an electrical conductive plug that is excellent in workability during assembly while maintaining airtightness.

  The present invention includes a lever body having a hollow portion, a metal core wire inserted through the hollow portion of the lever body, a cylindrical connection fitting that includes the insulator body and the core wire, and an inside of the connection fitting. An electric conduction plug having a holding member for holding a core wire on a connection fitting.

  The electric conduction plug according to claim 1, wherein the holding member is made of an elastic material.

  3. The electric conduction plug according to claim 1, wherein the insulator is provided so as to sandwich the holding member from above and below in the axial direction of the core wire.

  4. The electric conduction plug according to claim 1, wherein the holding member has a rib on at least a surface in contact with the connection fitting and the core wire.

  5. The insulator electrical appliance according to claim 1, wherein the connection fitting has a small-diameter portion having a small inner peripheral diameter, and the insulator body includes a flange portion wider than an oral portion of the small-diameter portion. Conductive plug.

  The holding member is an electrically conductive plug according to any one of claims 3 to 5, wherein the holding member has an uneven surface that fits into the insulator.

  By configuring as described above, it is possible to fix an electrical conductive plug that is excellent in workability and free from defects since it can be fixed without being bonded while maintaining airtightness.

  BEST MODE FOR CARRYING OUT THE INVENTION The best mode of the present invention, which is considered preferable, will be briefly described by showing the effects of the present invention.

  The electrically conductive plug of the present invention includes a cylindrical connecting metal fitting with an insulator and a metal core wire, and is configured to fix the connecting metal fitting and the core wire by using a holding member.

  Specifically, the holding member described above is formed of an elastic material, and is attached to the inside of a cylindrical connecting fitting, and by inserting a core wire through the holding member, A core wire is fixed to the inner wall.

  Insulator bodies represented by ceramics are likely to have dimensional errors depending on the individual, and it is difficult to manage tolerances. Conventionally, since the connection fitting and the insulator are fixed, there is a possibility that a defective product that cannot be sealed may be generated when a member such as a holding member is used. I had to rely on it, and the workability was getting worse.

  Therefore, in the present invention, the connection fitting and the core wire are fixed, and the holding member is used to fix them. That is, since both the connection fitting and the core wire are made of metal and the dimensional tolerance is relatively easy to manage, the holding member can be used to securely fix the dimensional tolerance. Therefore, since it can be assembled without using an adhesive, the workability is excellent and the possibility of occurrence of defects is reduced, and the plug is sealed by the elastic force of the holding member. Is also an excellent electrical conduction plug.

  Specific embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view of an electric conduction plug according to the present invention, which is a relay insulator comprising a cylindrical connecting fitting 1 and a pair of insulator bodies (first insulator body 3a and second insulator body 3b) having a hollow portion 2. And a metal core wire 4 that is inserted through the hollow portion 2 of the first insulator body 3a and the second insulator body 3b, and a holding member 5 that holds the core wire 4 to the connection fitting 1.

  The connection fitting 1 constitutes a housing of an electric conduction plug and serves as a member for attaching to a plug attachment hole of a device (not shown) such as a combustion apparatus. The structure is substantially cylindrical, with one end provided with a male threaded portion 6 formed with a thread for attaching an electric conduction plug to a device such as a combustion device, and the other end with an attachment. A tool engaging portion 7 having a hexagonal shape for engaging a tool such as a spanner or a wrench is provided.

  Further, as shown in FIG. 2, the connection fitting 1 has a cylindrical shape having a through hole 1 a penetrating in the axial direction. The through hole 1 a has a large inner diameter portion 9 communicating with the upper opening 8, and a large inner diameter portion 9. A small-diameter portion 11 having a small inner peripheral diameter communicating with the lower opening 10 is provided. Further, a ring-shaped presser fitting 12 is disposed in the upper opening 8.

  The relay insulator is composed of a first insulator body 3a in the lower part of the figure and a second insulator body 3b in the upper part of the figure. The first insulator body 3a and the second insulator body 3b are substantially cylindrical by a ceramic sintered body such as alumina. It has a hollow portion 2 for inserting the core wire 4 along its own axial direction.

  Further, both the first insulator 3a and the second insulator 3b have a wide flange 13. The diameter of the flange portion 13 is larger than the diameter of the small diameter portion 11 of the connection fitting 1 in order to prevent the first insulator body 3a, the second insulator body 3b and the core wire 4 from falling off from the connection fitting 1 when the plug is assembled. It is provided. Further, the first insulator 3a and the second insulator 3b are provided in a state of being opposed to each other with the holding member 5 interposed therebetween, and a fitting convex portion 14 is formed at one end.

  The core wire 4 is provided in a state where the tip and the end protrude from the first insulator body 3a and the second insulator body 3b. The first insulator 3a has an adhesive 15 sealed in the hollow portion 2 and fixed to the core wire 4. As the adhesive 15, for example, an inorganic adhesive mainly composed of alumina or silica is used. Is used. In general, an inorganic adhesive has a very high heat-resistant temperature and is suitable for use at high temperatures.

  The holding member 5 is formed of an electrically insulating member having elasticity, and as shown in FIG. 3, a through-hole 5a penetrating in the axial direction is provided at the center, and a first insulator 3a and a second insulator are provided at both end surfaces. A fitting recess 16 that fits with the fitting protrusion 14 of 3b is formed. The holding member 5 is provided so as to be in close contact with the inner wall surface of the large-diameter portion 9 of the connection fitting 1, and the core wire 4 is inserted into the through-hole 5 a so that the core wire 4 is connected to the large connection fitting 1. It fixes to the inner wall face of the diameter part 9, and makes a plug an airtight state by this.

  In addition, ribs 17 are formed on the holding member 5. When a force is applied to the holding member 5 from the axial direction, the holding member 5 that is an elastic body spreads in the circumferential direction and presses the inner peripheral surface of the connection fitting 1 and the core wire 4. Since the holding member 5 has a stronger force for holding the connection fitting 1 and the core wire 4, the sealing performance of the plug is improved.

  In addition, since the rib 17 is provided in order to strengthen the force for holding the connection fitting 1 and the core wire 4, at least the contact surface 5 b with the inner wall surface of the connection fitting 1 and the contact surface 5 c with the core wire 4. However, it may be provided on the contact surface 5d with the fitting convex portion 14 as shown in the figure. Moreover, the shape of the rib 17 and the position to be provided are not limited thereto.

  Next, assembly of the electrical conductive plug having the above-described configuration will be described.

  First, the core wire 4 is assembled in advance to the first insulator 3 a and fixed with the adhesive 15, and this is inserted into the through hole 1 a from the upper opening 8 of the connection fitting 1. Then, since the core wire 4 is thinner than the small-diameter portion 11 of the connection fitting 1, the tip passes through the through hole 1 a and protrudes from the lower opening 10, but in the first insulator 3 a, the collar portion 13 is caught on the small-diameter portion 11, It is locked to the connection fitting 1 in a state protruding from the lower opening 10 at a predetermined position.

  Next, the holding member 5 is mounted inside the connection fitting 1 through the through hole 5 a of the holding member 5 at the end of the core wire 4 protruding from the upper opening 8, and the core wire 4 and the inner wall of the connection fitting 1 are fixed. .

  Then, the second insulator 3b is placed on the holding member 5 through the core wire 4 through the hollow portion 2 of the second insulator 3b with the fitting convex portion 14 facing downward. Then, the holding member 5 is sandwiched between the first insulator 3a and the second insulator 3b from above and below, and the fitting recess 16 of the holding member 5 and the fitting protrusion 14 of the first insulator 3a and the second insulator 3b. Will face each other.

  Finally, the ring-shaped pressing metal 12 is placed on the second lever body 3b, the pressing metal 12 is pressed to push down the second lever body 3b, and the first lever body 3a and the second lever body 3b. And the holding member 5 are brought into close contact with each other. Then, when the presser fitting 12 is pressed until it comes into contact with the connection fitting 1, the fitting protrusion 14 of the first insulator 3a and the second insulator 3b and the fitting recess 16 of the holding member 5 are completely fitted. It becomes a state.

  When a force is applied to the holding member 5 from the axial direction by pushing down the second insulator 3b, the holding member 5 that is an elastic body spreads in the circumferential direction, and the holding member 5 that has been spread out is inside the connection fitting 1. The peripheral surface and the core wire 4 are pressed to hold the connection fitting 1 and the core wire 4 in a sealed state. In addition, the ribs 17 formed on the contact surfaces 5b, 5c, and 5d of the holding member 5 increase the force with which the holding member 5 holds the connection fitting 1 and the core wire 4, so that the sealing performance is further improved.

  Furthermore, since the unevenness | corrugation shape of the 1st insulator 3a and the 2nd insulator 3b and the holding member 5 will be in a fitting state, since the force which pushes the holding member 5 works strongly, the connection metal fitting 1 and the core wire 4 are made more It can be held firmly.

  That is, since the connection fitting 1 and the core wire 4 are both made of metal and the dimensional error due to the individual is extremely small, the connection member 1 and the core wire 4 are securely connected by the holding member 5 by configuring as described above. It can be fixed. Therefore, since it can be assembled without using an adhesive, the workability is excellent and the possibility of occurrence of defects is reduced, and furthermore, the plug is hermetically sealed by the elastic force of the holding member 5, so that airtightness is maintained. It is also an excellent electrical conduction plug.

It is sectional drawing of the electrically conductive plug of the Example of this invention. It is sectional drawing of the connection metal fitting of the Example of this invention. It is sectional drawing of the holding member of the Example of this invention. It is sectional drawing of the conventional electrical conduction plug.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Connection metal fitting 2 Hollow part 3a insulator (1st insulator)
3b Insulator body (second insulator body)
4 core wire 5 holding member 11 small diameter portion 13 flange portion 17 rib

Claims (6)

  An insulator having a hollow portion, a metal core wire that is inserted through the hollow portion of the insulator, a cylindrical connection fitting that includes the insulator and the core wire, and a connection fitting that connects the core wire inside the connection fitting An electric conduction plug comprising a holding member for holding the electric conduction plug.   The electric conductive plug according to claim 1, wherein the holding member is made of an elastic material.   The electric conduction plug according to claim 1, wherein the insulator is provided so as to sandwich the holding member from above and below in the axial direction of the core wire.   The electric conduction plug according to any one of claims 1 to 3, wherein the holding member has a rib on at least a surface in contact with the connection fitting and the core wire.   5. The insulator electrical conduction plug according to claim 1, wherein the connection fitting has a small diameter portion having a small inner peripheral diameter, and the insulator body includes a flange portion wider than an oral portion of the small diameter portion. .   The electrically conductive plug according to claim 3, wherein the holding member has an uneven surface that fits into the insulator.

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