JPH10134694A - Cylindrical cut-out - Google Patents

Abstract

PROBLEM TO BE SOLVED: To securely prevent invasion of dirt from an opening of a trapezoidal member into a main body while simplifying a structure to fit and hold a sealing plug engaged with the hapezoidal member. SOLUTION: A trapezoidal member 23 is made of elastic material, so that even if accuracy in dimensions of the insulator main body 12 varies, an error in dimensions of an insulator main body 12 can be absorbed by elastic deformation of the trapezoidal member 23 when the trapzoidal member 23 is fixed to the insulator main body 12. As a result, the trapezoidal member and the insulator main body are adhered each other and kept contacted. In addition, since a fitting and holding portion 31 to fit and hold the sealing plug is formed as one unit, metal fixtures and the like for engaging holding used in the past are not necessary any more.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical cutout used as a primary protection device for a pole transformer in a high-voltage distribution line.

[0002]

2. Description of the Related Art As shown in FIG. 4, generally, a cylindrical member 53 made of synthetic resin is fitted into a lower end opening 52 of a cylindrical cutout insulator body 51. As shown in FIG. A seal plug 54 made of a synthetic resin is also attached to the pot member 53. The sealing plug 54 prevents infiltration of salt water, dust and the like into the main body 51. The hook member 5
A plurality of cutout recesses 55 are radially formed on the lower surface of 3, and fasteners 56 are attached and fixed to the cutout recesses 55 with screws 58 and the like. The stopper 56 engages and holds the sealing plug 54 in the opening 57 of the hook member 53.

[0003]

However, the above-mentioned prior art has the following problems. (1) The space between the opening 57 of the pot member 53 and the sealing plug 54 cannot be completely sealed due to dimensional errors, molding conditions, and the like. Contaminants may enter the insulator main body 51 from the gap with the sealing plug 54 and cause a problem.

(2) A sealing plug 54 for the hook member 53
Is performed by the stoppers 56, the number of parts increases and the number of assembling steps increases.
As a result, there is a problem that the cost increases.

(3) The dimensional accuracy of the insulator main body 51 is relatively uneven during manufacture. For this reason, conventionally, a large amount of epoxy resin 60 or the like for maintaining security and fixing is interposed between the insulator main body 51 and the hook member 53 to absorb the dimensional error, thereby preventing a gap from being generated therebetween. , And are stuck. For this reason, there is a problem that the assembling becomes troublesome and the cost increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a first object of the present invention is to reliably prevent infiltration of contaminants into the main body from the opening of the hook member. It is to provide a cylindrical cutout.

A second object is to provide a cylindrical cutout which can simplify the structure for engaging and holding a sealing plug with a hook member. A third object is to provide a cylindrical cutout capable of sealing between the insulator main body and the hook member without using a large amount of an adhesive or the like.

[0008]

In order to achieve the above object, according to the first aspect of the present invention, a hook member attached to a lower end opening of a main body accommodating a fuse tube, and an opening of the hook member are provided. In a cylindrical cutout provided with a sealing plug which is detachably engaged with the plug, the hook member is made of an elastic material.

According to a second aspect of the present invention, in the first aspect of the present invention, it is preferable that the hook member is integrally formed with an engagement holding portion for engaging and holding the sealing plug. I do.

According to a third aspect of the present invention, in the second aspect of the present invention, the engagement holding portion contacts a lower locking portion that contacts a lower portion of the sealing plug and an upper portion of the sealing plug. The gist of the present invention is to have an upper locking portion.

According to a fourth aspect of the present invention, in the second or third aspect, the engagement holding portion is formed over the entire circumference of the inner peripheral surface of the hook member. This is the gist.

According to a fifth aspect of the present invention, in the first aspect of the present invention, a seal portion having a diameter larger than an inner diameter of the insulator body is integrally formed on an outer peripheral surface of the hook member. The gist is that it is formed.

(Function) In the first aspect of the present invention, since the hook member is formed of an elastic material, even if the dimensional accuracy of the insulator body varies, the hook member is mounted on the insulator body. Since the hook member is elastically deformed, a dimensional error of the insulator body is allowed. As a result, the hook member and the insulator main body are brought into close contact with each other, and the sealing between them is improved.

According to a second aspect of the present invention, in addition to the function of the first aspect, the sealing plug is engaged and held by the hook member by an engagement holding portion formed integrally with the hook member. You.

According to a third aspect of the present invention, in addition to the function of the second aspect, a lower locking portion is provided at a lower portion of the sealing plug in a state where the sealing plug is engaged and held by the hook member. , And the upper locking portion contacts the upper part of the sealing plug. That is, in the state where the sealing plug is engaged and held by the hook member,
The sealing plug is in a state of being clamped by the lower locking portion and the upper locking portion.

According to a fourth aspect of the present invention, in addition to the function of the second or third aspect, the engagement holding portion is formed over the entire inner peripheral surface of the hook member. Therefore, the sealing property between the hook member and the sealing plug is improved when the sealing plug is engaged and held.

According to a fifth aspect of the present invention, in addition to the function of the first aspect of the present invention, the insulator body and the hook member are formed by a seal member formed on the outer peripheral surface of the hook member. And the sealing performance with the seal is further improved.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the insulator main body 12 constituting the cylindrical cutout 11 is formed in a cylindrical shape. A fuse cylinder insertion hole 13 is provided inside the insulator body 12, and a power supply side lead wire 1 is provided at an upper end thereof.
An upper electrode 15 connected to the fourth electrode 4 is provided. An arc extinguishing rod 16 is inserted and supported inside the upper electrode 15. A lower end opening 17 that opens downward is formed at the lower end of the insulator main body 12. A lower electrode 19 connected to the load side lead wire 18 is provided in the lower end opening 17, and a fuse tube 20 is detachably accommodated in the fuse tube insertion hole 13. Upper cap 2 of fuse tube 20
1 is in contact with the upper electrode 15, and the movable electrode 22 at the lower end is in contact with the lower electrode 19.

As shown in FIGS. 1 and 2, below the lower end opening 17 of the insulator main body 12, a hook member 23 is mounted. A sealing plug 25 made of synthetic resin is detachably engaged and held in the opening 24 of the hook member 23.

The hook 23 is made of an elastic material. In the present embodiment, a rubber material is used as the elastic material constituting the hook member 23, and EPDM (ethylene propylene rubber) having excellent weather resistance and tracking resistance is used.

The hook member 23 is formed in a substantially cylindrical shape, and its outer peripheral surface comprises a large diameter portion 26 and a small diameter portion 27.
A step surface 28 is formed at a boundary between the two portions. The step surface 28 is formed in a tapered shape that is inclined in a direction descending toward the center of the hook member 23. An engaging projection 29 having a diameter larger than the inner diameter of the lower end opening 17 of the insulator main body 12 is integrally formed on the outer peripheral surface of the small diameter portion 27 over the entire circumference. When the hook member 23 is mounted on the insulator body 12, the engaging projection 2 of the hook member 23 is inserted into the concave groove 30 formed over the entire inner peripheral surface of the lower end opening 17.
9 are engaged. In the present embodiment, the diameter of the engaging protrusion 29 is larger than the diameter of the concave groove 30, and when the bite member 23 is attached to the insulator main body 12, the engagement protrusion 2
9 is elastically deformed and closely adheres to the groove 30. When the hook member 23 is attached to the insulator main body 12, the step surface 28 and the lower end face 12a of the insulator main body 12 come into contact with each other.

An engagement holding portion 31 is formed integrally on the inner peripheral surface of the hook member 23 over the entire circumference. A concave portion 40 is formed between the engagement holding portion 31 and the large diameter portion 26. The engagement holding portion 31 has a large-diameter tapered surface 32 on the lower side and a locking surface 33 as a lower locking portion.
Above the locking surface 33, a tapered surface 35 which is inclined at substantially the same gradient as the peripheral surface of the umbrella portion 25a of the sealing plug 25 is formed. A projection 36 as an upper locking portion is integrally formed on the upper portion of the tapered surface 35. The protrusion 36 is also formed over the entire inner surface of the hook member 23.

Although not directly related to the gist of the present invention,
In this embodiment, a connecting portion 38 of a string 37 for preventing the sealing plug 25 from dropping on the ground is integrally formed on the outer peripheral surface of the lower portion of the insulator main body 12. Generally, the connecting portion 38 is formed integrally with the hook member.
By integrally forming the connecting portion 38 with the connector 2, when the sealing plug 25 comes off the hook member 23 at the time of interruption due to a short circuit accident or the like, it is ensured that the impact also causes the hook member 23 to come off the insulator main body 12 together with the sealing plug 25. Can be prevented.

Next, the hook member 23 is connected to the insulator main body 12.
The operation at the time of mounting on a vehicle will be described. When attaching the hook member 23 to the insulator body 12, first, the insulator body 1
The hook member 23 is inserted from the small-diameter portion 27 through the lower end opening 17 of the second member 2 and inserted. At this time, the engagement projection 29 is pressed against the inner surface of the lower end opening 17 and slides with respect to the lower end opening 17. When the engaging projection 29 reaches a position facing the concave groove 30 of the insulator body 12, the engaging convex 29 returns to the substantially original shape by the elastic force, and the concave groove 3
Close contact with 0. Thereby, the sealing property in the insulator main body 12 is favorably maintained. At the same time, the insulator body 12
The lower end surface 12a of the first contact portion and the step surface 28 contact each other. At this time,
Due to the step surface 28 and the engaging projection 29, the portion of the insulator main body 12 between the two is held by the elastic force. Thereby, the hook member 23 is securely fixed in the lower end opening 17.

Next, the operation when the sealing plug 25 is attached to the hook member 23 will be described. When the sealing plug 25 is attached to the hook member 23, the sealing plug 25 is pushed upward from the state where the umbrella portion 25a of the sealing plug 25 is in contact with the tapered surface 32 of the engagement holding portion 31. Then, the engagement holding portion 31 is elastically deformed outward, and the diameter of the engagement holding portion 31 is increased. Thereby, the sealing stopper 25 can be pushed further upward. When the lower edge of the umbrella portion 25 a of the sealing plug 25 passes through the tapered surface 32 of the engagement holding portion 31, the lower edge of the umbrella portion 25 a engages with the locking surface 33 of the engagement holding portion 31, and 36 contacts the upper edge of the umbrella 25a. For this reason, the umbrella portion 25a of the sealing plug 25 is
6 to be held. As a result, the sealing plug 25 is securely engaged and held with the hook member 23.

As described above, in the present embodiment, the following effects can be obtained by forming the cylindrical cutout 11. (1) In the present embodiment, since the hook member 23 is made of an elastic material, even if the dimensional accuracy of the insulator main body 12 varies, when the hook member 23 is mounted on the insulator main body 12, the hook member 23 is formed. The 23 side can be elastically deformed to absorb a dimensional error of the insulator main body 12. As a result, the hook member and the insulator main body are kept in contact with each other in a state of being in close contact with each other. As a result, the sealing property between the two can be improved, and thus the hook member 2 can be used without using a large amount of adhesive or the like.
Since the sealing property between the insulator body 3 and the insulator body 12 can be improved,
Infiltration of contaminants can be prevented, and the reliability of the cylindrical cutout can be improved. Further, cost can be reduced.

(2) In the present embodiment, the hook member 23
Since the engagement holding portion 31 that engages and holds the sealing plug 25 is integrally formed, the conventionally used engagement holding fittings and the like are not required. Thereby, the number of parts can be reduced, and the cost can be further reduced.

(3) The engagement holding portion 31 is provided with the locking surface 33 and the projection portion 36 so that the upper end edge and the lower end edge of the umbrella portion 25a of the sealing plug 25 are sandwiched therebetween. The sealing plug 25 can be engaged with the hook member 23 without any gap, and it is possible to reliably prevent infiltration from entering between the hook member 23 and the sealing plug 25. as a result,
The reliability of the cylindrical cutout 11 can be improved.

(4) The engagement holding portion 31 is a hook member 23.
Is formed over the entire periphery of the inner surface of the cylindrical cutout 11, the sealing property between the hook member 23 and the sealing plug 25 can be further improved when the sealing plug 25 is engaged and held.
Can be further improved.

(5) An engaging projection 29 having a diameter larger than the inner diameter of the lower end opening 17 of the insulator main body 12 is integrally formed on the outer peripheral surface of the bite member 31 (small diameter portion 27). The sealing performance with the hook member 23 can be further improved.

The present invention may be embodied as follows. (1) The embodiment is embodied by omitting the engagement protrusion 29 as a seal formed on the outer peripheral surface of the hook member 23.

(2) The number of the engagement bodies 29 as seals formed on the outer peripheral surface of the hook member 23 is appropriately changed. (3) The projection 36 as an upper locking portion formed on the engagement holding portion 31 of the hook member 23 is omitted.

(4) The seal portion formed on the outer peripheral surface of the hook member 23 and the engagement holding portion 31 formed on the inner peripheral surface of the hook member 23 are formed not partially but entirely over the entire circumference. thing.

(5) An adhesive is applied to the outer peripheral surface of the hook member 23.

(6) In the above embodiment, the hook member 23
A part (large-diameter part 26) is exposed to the outside from the insulator main body 12, but this may be configured as shown in FIG. That is, the outer diameter of the hook member 41 may be made substantially the same, so that the hook member 41 is not exposed from the insulator main body 12. Also in this case, by forming the engagement protrusion 29 on a part of the outer surface of the hook member 41, the sealing property between the insulator main body 12 and the hook member 41 is further improved.

(6) In the above embodiment, EPDM was used as the elastic material, but Si (silicone rubber), II
It may be embodied by using a rubber material such as R (butyl rubber).

[0037]

According to the first aspect of the present invention, since the hook member is formed of an elastic material, the hook member is mounted on the insulator body even when the insulator body has dimensional accuracy variations. Not only can the member be elastically deformed to absorb the dimensional error of the insulator main body, but also the sealing performance between the hook member and the insulator main body can be improved. As a result, infiltration of contaminants can be prevented, and the reliability of the cylindrical cutout can be improved. Further, cost can be reduced.

According to the invention described in claim 2, according to claim 1
In addition to the effects of the invention described in (1), the number of parts can be reduced and the cost can be further reduced by integrally forming the holding portion for engaging and holding the sealing plug with the hook member.

According to the invention set forth in claim 3, according to claim 2
In addition to the effects of the invention described in the above, in a state where the sealing plug is engaged and held by the hook member, the sealing plug can be held in a state where the sealing plug is held by the lower locking portion and the upper locking portion, so that the sealing plug is The waffle member can be engaged with the clearance without any gap, and the infiltration of contaminants from between the wrinkle member and the sealing plug can be reliably prevented.

According to the invention set forth in claim 4, according to claim 2,
Or, in addition to the effect of the invention described in claim 3, since the engagement holding portion is formed over the entire circumference of the inner peripheral surface of the hook member, the engagement holding portion is sealed with the hook member at the time of holding the engagement of the sealing plug. The sealing performance with the stopper can be further improved.

According to the invention set forth in claim 5, according to claim 1,
In addition to the effects of the invention described in any one of the fourth to fourth aspects, the seal between the insulator body and the hook member can be further improved by the seal member formed on the outer peripheral surface of the hook member.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of one embodiment of a cylindrical cutout embodying the present invention.

FIG. 2 is an enlarged sectional view of a main part.

FIG. 3 is a partial cross-sectional view of a cylindrical cutout in another embodiment.

FIG. 4 is a cross-sectional view of a prior art cylindrical cutout.

[Explanation of symbols]

11: cylindrical cutout, 17: lower end opening, 20 ...
Fuse cylinders, 23, 41 ... hook members, 24 ... openings,
25: sealing stopper, 31: engagement holding part, 33: locking surface as lower locking part, projection as upper locking part.

Continuation of the front page (72) Inventor Takanobu Ueda 1 Ue-Kabari, Inuyama-shi, Aichi Energy Energy Port Co., Ltd.

Claims (5)

[Claims] 1. A cylindrical cutout comprising: a hook member attached to a lower end opening of a main body containing a fuse cylinder; and a sealing plug removably engaged with an opening of the hook member. A cylindrical cutout, wherein the member is made of an elastic material. 2. The cylindrical cutout according to claim 1, wherein said hook member is integrally formed with an engagement holding portion for engaging and holding said sealing plug. 3. The locking member according to claim 2, wherein the engagement holding portion has a lower locking portion that contacts a lower portion of the sealing plug and an upper locking portion that contacts an upper portion of the sealing plug. Cylindrical cutout. 4. The cylindrical cutout according to claim 2, wherein the engagement holding portion is formed over the entire inner peripheral surface of the hook member. 5. The cylindrical cutout according to claim 1, wherein a seal portion having a diameter larger than an inner diameter of the insulator main body is integrally formed on an outer peripheral surface of the hook member.