JPH0689747A - Terminal table - Google Patents

Abstract

PURPOSE:To enhance the effectiveness and easiness in operations and mainte nance works by sensing heat emission of a terminal table used for connection of a cable etc., releasing gas, and eliminating a site work of applying a coating material which releases gas. CONSTITUTION:A terminal table 11 has a metal plate 22 supported by an insulative member 21 and is to perform wiring by the use of screws 23, 24 driven into the metal plate 22, wherein a coating material 32 to release gas with temp. rise is applied to the surface of a base material 31 made of metal having a threaded part 42, and thus a temp. sensing member 25 is formed and this is attached to the metal plate 22 by means of screw coupling.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal block used for connecting a cable or the like, and more particularly to a terminal block capable of detecting a temperature rise due to heat generation of a connecting portion.

In electric equipment such as a power receiving panel or a distribution panel, a terminal block is used for wiring a cable. In general, screws are used to connect to the terminal block, but there is a tendency for frequent overheating accidents due to loosening of the screws or screw tightening failure, or overcurrent due to additional load equipment. Measures to prevent it are desired.

[0003]

2. Description of the Related Art A conventional terminal block has a metal plate supported by an insulator, and two screws (or bolts) for wiring connection are screwed into two screw holes provided on both sides of the metal plate. It is configured. 2 when using the terminal block
Fasten and connect the crimped terminals to the primary and secondary cables or cable ends with two screws.

However, if the screw is not properly tightened or the screw is loosened, the contact resistance value at that portion increases and heat is easily generated, which may cause an overheating accident depending on the magnitude and duration of the load current. In order to prevent this, conventionally, screw tightening is performed using a torque driver, or lock paint is applied to connection points by screws.

Further, a color-changing tape which changes color due to a temperature rise is attached in advance to a place where heat may occur, and the presence or absence of the color change is visually checked to detect the heat-generating state of the equipment and prevent an overheating accident. Is being done.

[0006]

However, in the former method, the slackening of the screw may not be completely prevented by applying the lock paint, and the overheating accident which is not caused by the slackening of the screw such as overcurrent is prevented. You cannot do it.

[0007] In the latter method, it is necessary for the monitoring staff to constantly monitor the presence or absence of discoloration of the color-changing tape near the equipment. Therefore, it is practically difficult to carry out the usually required long-term monitoring by the latter method.

In view of the above-mentioned circumstances, there has been a demand for a method capable of effectively and economically preventing an accidental overheating of a connection point by a screw or the equipment itself. In response to such a demand, there is known a gas emitting body for temperature monitoring, which is capable of monitoring an abnormally high temperature by applying it to a place where heat may be generated (JP-A-3-261835).

Therefore, by applying the above-mentioned gas emitting body to the screw portion of the terminal block or the like, the gas is released from the gas emitting body when the temperature rises to a certain high temperature due to overheating, etc. A gas detector installed inside the car detects it and issues an alarm to prevent an overheating accident.

However, since this gas-releasing body is formed as a coating agent and is applied by a worker on site, the amount or amount of coating is different depending on the shape of the portion to be coated and the individual difference of the worker. The state varies. Further, although it is necessary to re-apply due to the secular change of the gas discharger, some problems remain in performing such maintenance work easily.

In view of the above problems, it is an object of the present invention to detect heat generation and release gas, and to eliminate the work of applying a coating agent that releases gas on site to improve workability and maintainability. To do.

[0012]

In order to solve the above-mentioned problems, the terminal block 11 according to the invention of claim 1 has a structure shown in FIGS.
As shown in FIG. 2, a screw 2 having a metallic conductor 22 supported by an insulator 21 and screwed into the conductor 22 is provided.
A terminal block 11 for wiring using 3 and 24, which is a temperature at which a coating material 32 that releases gas due to temperature rise is applied to the surface of a metallic base material 31 having a screw portion 42. A detection member 25 is attached to the conductor 22 by screwing.

In the terminal block 11 according to the second aspect of the present invention, the base material 31 is formed by projecting the threaded portion 42 on an end surface of a cylindrical shaft portion 41, and the coating agent 32.
Is applied to the outer peripheral surface of the shaft portion 41.

In the terminal block 11 according to the third aspect of the present invention, a thermo-seal 33 whose color changes with temperature rise is attached to the end surface of the shaft portion 41 opposite to the side where the screw portion 42 is provided. Consists of

The temperature detecting member 25 according to the invention of claim 4
Is a cylindrical shaft portion 41, a male screw portion 42 that is integrally formed to project from an end surface of the shaft portion 41, and an engagement provided on the shaft portion 41 for rotating the shaft portion 41. Part 43
And a coating agent 32 that is applied to the outer peripheral surface of the shaft portion 41 and that releases gas when the temperature rises.

[0016]

When the temperature of the connecting portion of the terminal block 11 rises, the heat is transferred to the gas releasing coating agent 32 via the conductor 22, the screw portion 42, and the shaft portion 41, and the temperature of the gas releasing coating agent 32 rises. . As a result, the gas-releasing coating agent 32 discharges gas to the outside, and the gas concentration rises, which is detected by the gas detector, thereby issuing an alarm or the like.

The coating of the gas releasing coating material 32 on the shaft portion 41 is performed, for example, in a factory. Temperature detection member 25
Is attached to the terminal block 11 or the like at a factory or an installation site.

[0018]

1 is a sectional front view of a terminal block 11 according to the present invention, FIG. 2 is a perspective view of the terminal block 11, FIG. 3 is a front view showing a state in which the terminal block 11 is attached, and FIG. It is a cross-sectional front view and a plan view of the temperature detecting member 25.

Referring to FIGS. 1 and 2, the terminal block 11 is
Insulator 21 such as synthetic resin, metal plate 22 supported by insulator 21, wiring screws 23 and 24 screwed into two screw holes 22a provided on both sides of metal plate 22, and metal plate 22 The temperature detecting member 25 is screwed into the screw hole 22b provided at the center of the.

The insulator 21 has a plate-shaped partition wall portion 51, a support portion 52 protruding from the partition wall portion 51, and a protection portion 53. The protection part 53 is for protecting the temperature detecting member 25, is formed in a substantially columnar shape, and an upper part thereof is opened for attachment / detachment of the temperature detecting member 25 and visual confirmation of the thermoseal 33. Windows 55 for releasing gas are provided at the left and right positions.

As shown in FIG. 3, a large number of terminal blocks 11 are arranged by being inserted into one rail RL by the respective supporting portions 52, and partition walls 51 of each terminal block 11 are arranged.
The transparent cover CV is inserted into the groove on the top of the.

Referring to FIG. 4, the temperature detecting member 25 is
It is composed of a metallic base material 31, a gas releasing coating material 32 applied on the surface of the base material 31, and a thermoseal 33. Base material 3
The reference numeral 1 includes a columnar shaft portion 41 and a screw portion 42 provided so as to project in the center of the lower end surface of the shaft portion 41. Shaft 41
A groove 43 for engagement with a driver is provided on the upper end surface of the. As the material of the base material 31, the gas releasing coating agent 3 is used.
2) Adhesiveness, thermal conductivity, strength, ease of manufacture, economy, etc. are taken into consideration. For example, aluminum, aluminum alloys, copper, copper alloys, and the like are used in consideration of thermal conductivity. Iron is used in consideration of economy.

The thermo-seal 33 changes its color when it rises to a certain temperature, and is attached to the upper end surface of the shaft portion 41 with an adhesive or the like. Next, the gas releasing coating agent 3
An example of No. 2 will be described. Note that the gas release coating agent 32
Since the details are described in JP-A-3-261835 and Japanese Patent Application No. 3-195756, only the outline thereof will be described here.

FIG. 5 is a sectional view showing the gas releasing coating agent 32. The gas-releasing coating agent 32 is for releasing a gas that can be detected by a gas detector due to a temperature rise, and a capsule 82 enclosing a low-boiling compound 81 and a temperature-indicating pigment 84 are dispersed and integrated in a paint 83. Has been done.

The low boiling point compound 81 varies depending on the type of the terminal block 11 etc., rated temperature, heat resistant temperature, operating conditions, gas detector detection method, sensitivity, other operating conditions, environmental conditions, etc. Is a liquid having a boiling point in the range of about 30 to 200 degrees Celsius, preferably 60 to 120 degrees Celsius.

The low boiling point compound 31 and the capsule 82 are
10 to 90%, preferably 4 with respect to the total weight of
An amount of about 0 to 70% is enclosed. The wall material of the capsule 82 is made of a material that breaks down due to an increase in internal pressure when the temperature of the low boiling point compound 81 enclosed therein exceeds the boiling point. As the wall material of the capsule 82, various conventionally known organic materials and inorganic materials can be used. Examples of the organic material include acrylic resins, vinyl acetate resins, vinylidene resins, gelatin, polyvinyl alcohol acetalized products, and vinyl chloride resins. Examples of the inorganic material include metal oxides, for example, silicate compounds such as sodium silicate and potassium silicate. Generally, the average particle size of the capsule 32 is preferably about 10 to 40 μm.

Capsule 32 enclosing the low boiling point compound 81
Is usually 10 to 90 in the dry coating film of the gas releasing coating agent 32.
%, Preferably about 50 to 80%. The capsule 82 containing the low boiling point compound 81 as described above is produced by various conventionally known production methods such as an in-site polymerization method and an interfacial polymerization method.

The temperature-indicating pigment 84 is a substance that exhibits a color or discolors due to a temperature rise caused by heat generation of equipment, and includes compounds such as dyes, pigments and cholesteric liquid crystals. Temperature indicator 84
Is compounded so that the dry coating film of the gas releasing coating agent 32 usually contains an amount of about 2 to 50% by weight, preferably about 5 to 20% by weight.

The paint 83 contains a binder and the like,
As a result, a proper number of capsules 82 and temperature-sensitive pigments 84 are integrated and attached to the outer peripheral surface of the shaft portion 41. As the coating material 83, there are one that forms a porous coating film so that the gas released from the capsule 82 can be released to the outside of the coating film, and one that the coating film is destroyed by the destruction of the capsule 82. Used.

As the binder, vinyl acetate emulsion, vinyl acetate-acrylic emulsion, vinyl acetate-
Veova emulsion, acrylic emulsion, styrene-acrylic emulsion, epoxy emulsion, urethane emulsion and the like are preferably used. When a low temperature decomposable substance is used instead of the low boiling point compound, a solvent-type coating resin is also used as a binder because of its solubility.

The binder is usually contained in the dry coating film of the gas releasing coating material 32 in an amount of 5 to 50% by weight, preferably 10 to 20% by weight.
The paint 83 is blended so as to contain a certain amount. 5
If it is less than%, the binding of each component will be insufficient, and 50
%, The release of gas is suppressed, which is not preferable.

The gas-releasing coating agent 32 contains 5 parts in the dry coating film.
The non-thermophilic pigment may be blended in an amount not exceeding 0% by weight, and various additives such as a thickener and a stabilizer for preventing sagging may be blended as necessary. Temperature indicator 84
May be omitted.

As a method for applying the gas releasing coating agent 32,
For example, the shaft portion 41 is dipped in the gas releasing coating material 32 to apply the coating. Ordinary coating methods such as brush coating and spray coating may be used. The surface of the shaft portion 41 may be subjected to a primer treatment and then applied.

The temperature detecting member 25 is the metal plate 22.
After being screwed into the screw hole 22b, the thermo-seal 33 is attached. By being screwed into the screw holes 22b, the lower surface of the shaft portion 41 comes into close contact with the surface of the metal plate 22, and the thermal conductivity between them is extremely good.

The terminal block 11 configured as described above is mounted in a distribution board, for example, as shown in the above-mentioned prior application, and cables and the like are fixed and connected by screws 23 and 24. When the connection portion of the terminal block 11 generates heat due to loosening of the screws 23 and 24 or overcurrent, the heat is transmitted to the temperature detecting member 25 via the metal plate 22, and the temperature of the gas releasing coating agent 32 rises.

When the low boiling point compound 81 reaches the boiling point, the low boiling point compound 81 vaporizes and the internal pressure of the capsule 82 rises,
As a result, the capsule 82 is broken, and the vaporized low boiling point compound 81 passes through the coating film of the coating material 83 and is discharged from the window 55 to the outside of the terminal block 11. When the gas concentration of the low boiling point compound 81 rises, a gas detector installed in the distribution board detects this and issues an alarm or the like.

This makes it possible to easily know that an abnormally high temperature has occurred in the terminal block 11, and to appropriately check the distribution board and the load, stop the power transmission to the distribution board, or disconnect the load. Actions can be taken to prevent overheating accidents.

Further, since the thermo-seal 33 is attached to the temperature detecting member 25, it is possible to easily and quickly identify the location where the abnormally high temperature occurs by finding the discolored portion.

According to the above embodiment, the temperature detecting member 2
5 is pre-coated with the gas releasing coating agent 32, and the temperature detection member 25 only needs to be attached to the metal plate 22 by screw connection. Therefore, the attachment work is easy and the application work on site is not required. Therefore, it is possible to make the applied amount or the applied state uniform without variation, and it is possible to reliably detect the abnormal high temperature.

Further, since the temperature detecting member 25 can be easily replaced and can be replaced even in a live state, the used temperature detecting member 25 can be replaced or the temperature detecting member 25 can be replaced periodically. Easy to replace and excellent maintainability.

In the above examples, the low boiling point compound 81
The type, the size, the shape, the material of the capsule 82, the configuration of the gas releasing coating agent 32, and the like can be variously changed. In addition to the terminal block 11, the temperature detecting member 25 described above
Circuit breakers, relays and other power distribution equipment, electric motors and other electrical equipment, elevators and other electrical equipment, machine tools and other mechanical equipment, automobiles, aircraft, ships, or buildings, etc. Can be used.

[0042]

According to the present invention, it is possible to detect the heat generation in the terminal block and release the gas, and to eliminate the work of applying the coating agent that releases the gas on site, thus improving workability and maintainability.

According to the second and fourth aspects of the present invention, the structure of the temperature detecting member is simple and easy to manufacture, and the temperature detecting member is easily attached to and detached from the conductor. According to the third aspect of the present invention, it is possible to easily and quickly identify the location where the abnormally high temperature is generated due to the discoloration.

[Brief description of drawings]

FIG. 1 is a sectional front view of a terminal block according to the present invention.

FIG. 2 is a perspective view of a terminal block according to the present invention.

FIG. 3 is a front view showing a state in which the terminal block according to the present invention is attached.

FIG. 4 is a sectional front view and a plan view of a temperature detecting member according to the present invention.

FIG. 5 is a cross-sectional view showing a gas releasing coating agent.

[Explanation of symbols]

 11 Terminal Block 21 Insulator 22 Metal Plate (Conductor) 23, 24 Screw 25 Temperature Detection Member 31 Base Material 32 Gas Release Coating Agent (Coating Agent) 33 Thermoseal 41 Shaft 42 Screw Part (Male Screw Part) 43 Groove (Engagement part)

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Sumio Nakauchi 1-20-10 Oi, Shinagawa-ku, Tokyo Fujitsu System Construction Ltd. (72) Inventor Toshimitsu Kurihara 1-20-10 Oi, Shinagawa-ku, Tokyo Within Fujitsu System Construction Ltd.

Claims (4)

[Claims] 1. A metal conductor (22) supported by an insulator (21) is provided, and wiring is performed using screws (23) and (24) screwed into the conductor (22). A terminal block (11) for use in temperature detection, wherein a metal base material (31) having a screw portion (42) is coated with a coating agent (32) that releases gas when the temperature rises. The member (25) is the conductor (2
A terminal block characterized by being attached to 2) by screw connection. 2. The base material (31) has a cylindrical shaft portion (4).
2. The threaded portion (42) is formed so as to project from the end surface of 1), and the coating agent (32) is applied to the outer peripheral surface of the shaft portion (41). Terminal block. 3. A thermo-seal (33) whose color changes with temperature rise is attached to an end surface of the shaft portion (41) opposite to the side where the screw portion (42) is provided. The terminal block according to claim 2, wherein the terminal block is a terminal block. 4. A cylindrical shaft part (41), a male screw part (42) integrally formed so as to project from an end surface of the shaft part (41), and provided on the shaft part (41). An engaging portion (43) for rotating the shaft portion (41), and a coating agent (32) which is applied to the outer peripheral surface of the shaft portion (41) and releases gas due to temperature rise. A member for temperature detection, characterized in that