JP3234966U - Cable gland waterproof test device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inspect a cable gland, which is a waterproof holder for an electric wire, safely and surely under direct vision by a simple operation even in a place without a power source, and to easily and surely store, transport and carry it without any trouble. We provide a waterproof and airtight test device for electric wires that is durable, easy to manufacture, and inexpensive. SOLUTION: This is a commercially available product in which a transparent airtight cylinder 1 as a standard material is used as a main body, and an opening on at least one side is detachably attached to be sealed by a sample mounting plate portion 4, which is also used in waterworks and the like. The problem is solved by supplying pressurized water to the cylindrical body by a certain pressurized water supply pump unit B. [Selection diagram] Fig. 2

Description

It relates to a small, lightweight, non-powered waterproof test device for testing the waterproof ability of a cable gland, which holds an electric wire penetrating a partition wall waterproof at the penetrating portion.

Generally, the cable gland is required to have waterproof performance, so it is necessary to perform a performance test to see if the cable meets the specified waterproof performance while holding and fixing the cable. Conventionally, for example, a method of sealing the upper opening of an airtight box provided with a bottom wall with a lid member to which a sample is attached, and then sending compressed air into the airtight box to measure the amount of air leakage (Patent). Document 1) or the inside of the airtight box is divided into two by an intermediate partition wall to which the subject is attached. A method of measuring the amount of water leaked to the water (Patent Document 2) and the like are known.

Japanese Patent No. 313038 Patent Publication No. 2010-25881 However, for example, in the case of a method for measuring the amount of compressed air leakage using an airtight box, high accuracy is required for manufacturing and joining the airtight box frame, reliable and accurate sealing with the lid member is required, and the box is a cube. Therefore, a high internal pressure is applied to each wall body, and it is necessary to firmly manufacture the device itself, which inevitably increases the manufacturing cost. In addition, the edge length of the joint portion of the lid member becomes long, and there is a high possibility that it will be difficult to determine the air leak portion due to the fact that the leaked air cannot be visually recognized. (Patent Document 1) Further, in the case of the method of dividing the airtight box by an intermediate partition and measuring the amount of leakage of high-pressure water, since it has a joint edge length of a member equal to or larger than the above-mentioned airtight box, it is further manufactured. Not only is it costly, but the work of attaching the sample to the intermediate partition requires a certain space for handling the attached sample, fingers, and tools, which makes it difficult to reduce the size of the device. In addition, the sealed margin is long and complicated, it takes time and labor to prepare for the test, and the entire device becomes large and requires a power supply, so that it cannot be easily carried to the work site (Patent Document 2). was there.

The object of the present invention is to eliminate such a difficulty. In other words, it is a compact, lightweight, and highly rigid structure for inspectors using this device, it is possible to easily perform multiple tests under different conditions, and it can operate extremely quickly without a power source if there is only about 1 liter of water. Therefore, it is an object of the present invention to provide a waterproof and airtight test device for an electric wire waterproof holder that can be easily subjected to a water leakage test regardless of location, is safe, easy to maintain and manage, and is easy to carry.

According to the first aspect of the present invention, by using the transparent airtight cylinder as the pressurized water storage tank portion, the waterproof margin length can be minimized as compared with the cubic water tank. If it is cut into pieces, it is not necessary to bond the walls to each other, and a highly rigid test body can be obtained extremely easily. The cylindrical body was provided with a liquid supply unit, a pressure detection unit, and a screwing portion for joining at at least one end edge of the cylindrical body opening, and an inspection jig rod was inserted as a separate part. The sample mounting plate portion to which the electric wire waterproof holder as a sample is detachably screwed is screwed to the end edge portion which is the cut surface of the cylindrical body via the waterproof packing, and then the liquid supply portion of the cylindrical body. The pressure change of the airtight cylinder due to the leakage of the compressed liquid from the waterproof holding part of the electric wire is detected from the pressure detection part, and the state of the sample under test because the cylinder is transparent. Can be visually recognized directly, and the problem is solved by conducting a waterproof test of the waterproof holding part of the electric wire.

According to the invention according to claim 2, the transparent airtightness is obtained by connecting a pressure resistant leak inspection pump for piping widely used in waterworks and the like via a liquid supply unit provided in the transparent airtight cylindrical body described above. It is used as a means to fill the cylindrical body with pressurized water. The pressure-resistant leak inspection pump for piping is composed of a water tank, a pressurizing part, a manual handle, an air vent valve, and a pressure gauge of the pump part. Is. The air remaining in the transparent airtight cylinder is released by opening the air vent valve of the pump, and the pressure for further supplying the pressurized water can be confirmed by the pressure gauge attached to the pump. Since the pump is a small and lightweight commercial product, it can be easily obtained, and since it has no power supply, the problem is solved by conducting a waterproof test of the waterproof holding part of the electric wire at any place regardless of the installation location. doing.

The material of the cylindrical body, which is the main body of the test piece, is made of a thermoplastic resin such as an acrylic resin or a polycarbonate resin in order to ensure sufficient rigidity, machinability such as cutting, ease of adhesion, and transparency of hardness. desirable. In addition, it is desirable to have a medium diameter from the viewpoint of workability such as mounting specimens. For example, by cutting a transparent acrylic resin pipe standard material with an outer diameter of 100 mm and a wall thickness of 12 mm according to Japanese Industrial Standards to a total length of about 200 mm. , The cylinder and the base material can be easily obtained. A pressure gauge is provided on one wall in the radial direction approximately intermediate in the length direction of the cylinder, a liquid supply section is provided on the other, and grooves are cut on both cut surfaces of the cylinder for waterproofing. The O-ring shall be embedded, and a threaded portion shall be cut at at least one of both end edges of the cylindrical body to screw a waterproof plate portion.

It is desirable that the waterproof plate portion is made of a strong material having sufficient rigidity to withstand water pressure, for example, an acrylic resin or a metal material which is the same as a transparent cylinder. The waterproof plate portion is such that the screwed portion is detachably screwed to the cylindrical body via the waterproof packing. In the center of the waterproof plate portion, there is a screw opening for screwing the electric wire waterproof holder from either side, which functions as a sample mounting plate, and the mounting direction of the electric wire waterproof holder is changed. It is extremely effective in conducting a waterproof test.

The cable gland (electric wire waterproof holder) waterproof test device of the present invention is composed of two units, a sample mounting airtight container section A which is a watertight test container, and a pressurized water supply pump section B. Of these, the main body / transparent airtight cylinder 1 of the airtight test container A has higher rigidity than the box type, and is a transparent resin cylinder having no adhesive portion, so that the airtightness is high and processing is easy. Further, since the transparent resin body uses a commercially available standard material, it is easy to obtain a high-precision base material, and the number of processing steps is small and the cost is low. Further, since the pressurized water supply pump unit B can use a commercially available product generally used in waterworks and the like, about 1 liter of water is put into the water tank 12 and the transparent airtight cylindrical body 1 is passed through the liquid supply unit 3. A power supply is not required just by connecting the water supply pipe 17, and the test can be started immediately at any place, which is extremely effective as a waterproof test device for the electric wire waterproof holder (cable gland) 9.

An embodiment of the present invention will be described in detail below. The transparent airtight cylindrical body 1 is formed by vertically cutting a standard material having a transparent acrylic resin cylindrical pipe outer diameter of 100 mm and a wall thickness of 12 mm to a total length of 170 mm to obtain an airtight pressure resistant test body. A narrow groove having a width of about 4 mm and a depth of about 2.5 mm is engraved on both sides of the main body in a circumferential shape, and an O-ring having a thickness of about 4 mm is embedded as a waterproof packing 6. Further, the sample mounting airtight container A is completed by engraving a screw groove with a width of about 15 mm on the inside of both ends of the cylindrical body 1 to form the end edge screwing portion 5. As a separate component, the sample mounting plate 4 is a disk-shaped acrylic resin plate having an outer diameter of 100 mm and a wall thickness of 15 mm, and a screwed portion having an outer diameter of 76 mm and a wall thickness of 15 mm is formed on one surface thereof, and the cylindrical body body can be detachably attached. Both cut surfaces are screwed closed in a water-honey-like manner via the waterproof packing 6. A screw through hole having an arbitrary diameter corresponding to the partition wall mounting diameter of the electric wire waterproof holder 9 which is a sample is opened in the substantially center of the sample mounting plate 4, and the sample mounting plate 4 is completed. Is.

In order to operate the waterproof test device of the present invention, first, the electric wire waterproof holder 9 which is a sample holding the inspection jig rod 8 according to the test method of the outside or the inside of the electric wire waterproof holder 9 which is a sample. Is screwed onto the sample mounting screwing portion 7 of the sample mounting plate 4. Next, the sample mounting plate 4 is screwed to both ends of the transparent cylinder 1 and the water supply hose 17 from the pressurized water pump unit B is connected to the liquid supply unit 3, so that the cylinder 1 is an airtight test container. Will be. Next, the water tank 12 of the pressurized water pump unit B is filled with about 1 liter of water, the manual lever 14 is swung, and the water of the water tank 12 is sent to the water supply hose 17 via the pressure unit 13. The water of the water supply hose 17 is supplied to the inside of the transparent airtight cylindrical body 1 through the liquid supply unit 3, but when the residual air of the cylindrical body is compressed and becomes a resistance pressure and it becomes difficult to supply water, the water supply pump unit B The residual air is released by opening the air vent valve 15 attached to the transparent airtight cylindrical body 1, and the transparent airtight cylindrical body 1 can obtain an internal pressure of about 5 Mpa by repeating the water supply. It can be confirmed. After leaving the sample under pressure for a certain period of time, the presence or absence of water leakage or decompression from the sample is confirmed by the pressure detection unit 2 and direct vision, and the test is completed.

Hereinafter, an embodiment will be described with reference to the accompanying drawings. Explained with reference to FIG. 1, this figure is a plan view of the entire waterproof test apparatus of the present invention. Reference numeral A is a sample mounting airtight container portion, and a state in which the electric wire waterproof holder (cable gland) 9 which is a sample is screwed inside the container. B is a system conceptual plan view of the pressurized water supply pump unit.

Explained with reference to FIG. 2, this figure is a front view of the entire waterproof test apparatus of the present invention. Reference numeral A is a sample mounting airtight container portion, and a state in which the electric wire waterproof holder (cable gland) 9 which is a sample is screwed inside the container. B is a front view of the system concept of the pressurized water supply pump unit.

Explained with reference to FIG. 3, this figure is a substantially central CC'line cross-sectional view of the A sample mounting airtight container portion in [FIG. 1]. It shows a state in which the inspection jig rod 8 is attached to the electric wire waterproof holder (cable gland) 9 which is a sample inside the container and is screwed to the sample mounting plate 4. The cross sections of the pressure detection unit 2 and the liquid supply unit 3 attached to the transparent airtight cylinder 1 are omitted.

Explained with reference to FIG. 4, this figure is an enlarged cross-sectional view taken along the line DE in FIG. It is a detailed view which shows the state which the electric wire waterproof holder (cable gland) 9 which is a sample is screwed to the sample mounting plate 4 screwed to the transparent airtight cylinder 1, and the sample mounting plate 4 is O-ring. The state of being screwed to the cylindrical body 1 in a waterproof state via the waterproof packing 6 of the above is also shown.

Explaining with reference to FIG. 5, this figure is a front view of the A sample mounting airtight container portion as in [FIG. 2]. It shows a state in which the electric wire waterproof holder (cable gland) 9 which is a sample is screwed to the outside of the sample mounting plate 4 screwed to the transparent airtight cylinder 1. This is a case of testing the waterproof function when pressure is applied from the inside of the sample. B Pressurized water pump section is omitted.

It is explanatory drawing which shows the start state of the pressure waterproof test from the outside to the electric wire waterproof holder (cable gland) 9 by the plan view which shows all the constituent members of the waterproof test apparatus of this invention embodiment. The pressurized water supply pump unit B is represented by a system conceptual diagram. It is explanatory drawing which shows the start state of the pressure waterproof test from the outside to the electric wire waterproof holder (cable gland) 9 by the front view which shows all the constituent members of the waterproof test apparatus of this invention embodiment. The pressurized water supply pump unit B is represented by a system conceptual diagram. It is explanatory drawing by the substantially central cross section which shows the pressure waterproofing test start state from the outside to the electric wire waterproofing holder (cable gland) 9 based on [FIG. 2] of the Example of this invention. However, the cross sections of the pressure detection unit 2 and the liquid supply unit 3 are omitted. The pressurized water pump unit B is omitted. Detailed explanatory view of the ED line portion of the substantially central cross section showing the start state of the pressure waterproof test from the outside to the electric wire waterproof holder (cable gland) 9 based on [FIG. 3] of the embodiment of the present invention. Is. The inspection jig rod 8 which is a simulated test body of an electric wire is mounted in a state of penetrating the waterproof seal 9b on which the waterproof sealing 9c is exteriorized, and the waterproof seals 9b and 9c are closely held by the partition wall mounting portion 9a and the waterproof seal cap 9d. Will be done. The electric wire waterproof holder (cable gland) 9 as a sample assembled in this way is watertightly mounted on the sample mounting plate 4 via a waterproof washer 9e. It is explanatory drawing by the front view which shows the pressure waterproofing test start state from the inside to the electric wire waterproofing holder (cable gland) 9 based on [FIG. 2] of the Example of this invention. However, the pressurized water supply pump unit B is omitted.

A Specimen mounting airtight container 1 Transparent airtight cylindrical body 2 Pressure detection 3 Liquid supply 4 Specimen mounting plate 5 Edge screwing 6 Waterproof packing 7 Specimen mounting screw 8 Inspection jig rod 9 Wire waterproof holder (Cable ground)
9a Partition mounting part 9b Waterproof seal 9c Waterproof seal ring 9d Waterproof seal nut cap 9e Waterproof washer 10 Abutment 11 Buffer material B Pressurized water pump part 12 Water tank 13 Pressurized part 14 Manual lever 15 Air vent valve 16 Pressure gauge 17 Water supply hose

Claims (2)

Attaching and detaching the electric wire waterproof holder as a sample with the inspection jig rod inserted into the transparent airtight cylindrical body provided with the liquid supply part, the pressure detection part, and the screwing part for joining at least one end edge part. The freely screwed sample mounting plate portion is screwed to the end edge portion of the airtight cylindrical body via a waterproof packing, and then filled with a compressed liquid through the liquid supply portion of the airtight cylindrical body to waterproof the electric wire. A waterproof and airtight test apparatus for performing a waterproof function test of an electric wire waterproof holder by detecting a pressure change in an airtight cylinder due to leakage of a compressed liquid from the holding portion from the pressure detecting portion. A pressure-resistant leak inspection pump for piping, which is a commercially available product used in waterworks, is connected via the liquid supply unit provided in the transparent airtight cylinder described above, and the inspection pump pressurizes the airtight cylinder. The waterproof and airtight test device for an electric wire waterproof holder according to claim 1, wherein the device is a liquid water feeding device.

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