JP5662780B2 - Explosion-proof fixing device - Google Patents

Description

  The present invention relates to an improvement of an explosion-proof fixing device that is applied to an explosion-proof device (explosion-proof container) such as an explosion-proof compressor, an explosion-proof heater, or an explosion-proof control panel and used to fix electric wires.

  Conventionally, as this type of explosion-proof fixing device, for example, a switch provided at a terminal box provided at a connection point of electric wires of an explosion-proof compressor described in Patent Document 1 or at a through point of electric wires of an explosion-proof control panel And what was applied to the terminal box provided in the connection location of the electric wire of indicator-lamps and the explosion-proof heater described in patent document 2 is known.

  The explosion-proof fixing device basically includes an explosion-proof device, electric wires provided at a connection point or a penetration point of the explosion-proof device, a holding member that is provided in the explosion-proof device and can hold the electric wires, and the holding member and the electric wire. And a synthetic resin body for fixing the electric wires.

  Such a device can fix the electric wires by a synthetic resin body filled between the holding body and the electric wires, and can exhibit an explosion-proof function and an insulating function.

Japanese Patent No. 3469414 Japanese Patent No. 4230446

  However, since such a thing uses a synthetic resin body produced by a synthetic resin material, it can fix the electric wires reliably, but deterioration due to ultraviolet rays occurs and there is a problem in weather resistance, Use was prohibited from the viewpoint of explosion prevention, and improvement was desired.

  The present invention was devised in view of the above-mentioned problems, and was devised to solve this problem. The problem is that the wires can be securely fixed and there is no risk of deterioration due to ultraviolet rays. The purpose of the present invention is to provide an explosion-proof fixing device that can perform an explosion-proof function and an insulation function.

Electrical explosion-proof fixation device of the present invention basically are those that are created by based on the idea and various test results, the invention of claim 1 includes a explosion proof, which is accommodated in the explosion proof a wire such provided through portions of the device and the wire such that provided at the connection point between the wire such and explosion proof the container wall, provided at the connection point and the through portion of the explosion proof while holding the electric wire such a holding member obtained, the wire class is filled between the ceramic cylindrical body which is accommodated in the holding member is penetrated, and said electric wire such and between the ceramic cylinder and said ceramic cylinder and the holding member A heat-resistant inorganic adhesive, an inward projection provided on the holding body, and an outward projection provided on a ceramic cylinder that engages the inward projection, and prevents the ceramic cylinder from moving in the explosion direction. It is composed of a unit, proof By the device and holding member and the ceramic cylinder and heat-resistant inorganic adhesive lies characterized in that securing the explosion proof.

A ceramic cylinder is housed in a holding body provided in the explosion-proof device, and electric wires provided at a connection location or a penetration location of the explosion-proof device are penetrated by the ceramic cylinder. A heat resistant inorganic adhesive is filled between the holding body and the ceramic cylinder or between the ceramic cylinder and the electric wires.
When the heat-resistant inorganic adhesive is cured, the electric wires are fixed by the ceramic cylinder and the cured heat-resistant inorganic adhesive.
Since the ceramic cylinder and the heat-resistant inorganic adhesive are used, the electric wires in the holding body can be securely fixed, there is no possibility of deterioration due to ultraviolet rays, and the explosion-proof function and insulation function are not impaired.

  It is preferable that a retaining means for preventing the ceramic cylinder from moving in the explosion direction is provided between the holding body and the ceramic cylinder. In this way, even if the ceramic cylinder is about to escape from the holding body in the explosion direction due to an explosion in the explosion-proof device, this is prevented by the retaining means. Therefore, the explosion-proof function is further improved.

  The retaining means preferably includes an inward projection provided on the holding body, and an outward projection provided on the ceramic cylinder and engaged with the inward projection when moving in the explosion direction. In this way, the retaining means can be configured with a simple structure, and the cost is not excessive.

  It is preferable that the explosion-proof device is an explosion-proof compressor, the holding body is a terminal box provided at a connection location of the explosion-proof compressor, and the electric wires are wires connected to terminals in the terminal box. If it does in this way, an electric wire can be fixed in the terminal box provided in the connection location of the explosion-proof compressor.

  It is preferable that the explosion-proof device is an explosion-proof heater, the holding body is a terminal box provided at a connection location of the explosion-proof heater, and the electric wires are wires connected in the terminal box. If it does in this way, an electric wire can be fixed in the terminal box provided in the connection location of the explosion-proof heater.

  It is preferable that the explosion-proof device is an explosion-proof control panel, the holding body is a cylinder body of switches provided at a penetration portion of the explosion-proof control panel, and the electric wires are electrodes penetrating into the cylinder body. . If it does in this way, an electrode can be fixed in the cylinder main body of the switches provided in the penetration part of the explosion-proof control panel.

  The explosion-proof device is an explosion-proof control panel, the holding body is a tube main body of indicator lights provided at a penetration portion of the explosion-proof control panel, and the electric wires are heat generating wires penetrating into the cylinder main body. Is preferred. If it does in this way, a heating wire can be fixed in the cylinder main part of the indicator lamps provided in the penetration part of an explosion-proof control panel.

According to the present invention, the following excellent effects can be achieved.
(1) A ceramic cylinder comprising an explosion-proof device, electric wires, a holder, a ceramic cylinder, and a heat-resistant inorganic adhesive, and in particular, a ceramic cylinder through which the electric wires are penetrated and stored in the holder, and the holder and the ceramic cylinder And a heat resistant inorganic adhesive filled between the ceramic cylinder and the electric wires, so that the electric wires can be securely fixed, yet there is no fear of deterioration due to ultraviolet rays, and an explosion-proof function And can perform insulation function.
(2) If a retaining means is provided between the holder and the ceramic cylinder to prevent the ceramic cylinder from moving in the explosion direction, even if an explosion occurs in the explosion-proof device, the retaining means is retained by the retaining means. The ceramic cylinder is prevented from escaping from the body in the direction of explosion. Therefore, the explosion-proof function is further improved.

The longitudinal cross-sectional view which shows the outline | summary of the explosion-proof fixing apparatus which concerns on the 1st example of this invention. FIG. 2 is a cross-sectional view of FIG. 1. The perspective view which shows the ceramic cylinder of FIG. The longitudinal cross-sectional view which shows the outline | summary of the explosion-proof fixing apparatus which concerns on the 2nd example of this invention. The perspective view which shows one ceramic cylinder of FIG. The longitudinal cross-sectional view which shows the outline | summary of the explosion-proof fixing apparatus which concerns on the 3rd example of this invention. The longitudinal cross-sectional view which shows the outline | summary of the explosion-proof fixing apparatus which concerns on the 4th example of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 3 show a first example of the explosion-proof fixing device of the present invention.

  The explosion-proof fixing device 1 includes an explosion-proof device 2, electric wires 3, a holding body 4, a ceramic cylinder 5, and a heat-resistant inorganic adhesive 6.

  The explosion-proof device 2 is a basic part of the explosion-proof fixing device 1, and in this example, it is an explosion-proof compressor (compressor) used for a refrigeration unit or the like.

  The electric wires 3 are provided at connection points or through points of the explosion-proof device 2. In this example, the electric wires 3 are electric wires (cables) provided at the connection points of the explosion-proof compressor 2 and include a plurality of core wires 7. .

  The holding body 4 is provided in the explosion-proof device 2 and can hold the electric wires 3. In this example, the holding body 4 is a terminal box provided in the explosion-proof compressor 2. The terminal box 4 has a rectangular parallelepiped shape. Although not shown, a part of the terminal box 4 is configured to be openable and closable, and a terminal (hermetic terminal) 8 having a plurality of electrodes is provided therein. .

The ceramic cylindrical body 5 is one in which the electric wires 3 are penetrated and accommodated in the holding body 4. In this example, the ceramic cylindrical body 5 is made of a ceramic material having excellent heat resistance, insulation, and the like, and in the axial direction. One or more through holes 9 corresponding to the number of the core wires 7 of the electric wires 3 are formed.
The ceramic cylinder 5 has a cylindrical shape, and has a cylindrical shape when the number of the through holes 9 is one, and a so-called lotus root shape when the number of the through holes 9 is plural.

  The heat-resistant inorganic adhesive 6 is filled between the holding body 4 and the ceramic cylinder 5 and between the ceramic cylinder 5 and the electric wires 3, and in this example, there is no influence on acid or alkali, In addition to heat resistance, so-called ceramic cements that are excellent in water resistance, electrical insulation, airtightness, workability and the like are used. Specific product names include Toyo Associates' heat resistant adhesive AD1000, ThreeBond's threebond 3732 heat resistant inorganic adhesive, Toagosei's Aron ceramic (heat resistant inorganic adhesive), and the like.

Next, the operation will be described based on such a configuration.
The electric wire 3 has a base end portion penetrating through a part of the terminal box 4 of the explosion-proof compressor 2 and a core hole 7 separated from the base end portion of the ceramic cylinder 5 accommodated in the terminal box 4. Then, each core wire 7 is connected to the electrode of the terminal 8.
At this time, one end surface of the ceramic cylinder 5 is brought into contact with the terminal 7 in the terminal box 4, and the connecting portion 10 between the core wire 7 of the electric wire 3 and the electrode of the terminal 8 is provided in each through hole 9. Be positioned.

A heat-resistant inorganic adhesive 6 is injected from a part of the terminal box 4 that can be opened and closed, and is filled between the terminal box 4 and the ceramic cylinder 5 or between the ceramic cylinder 5 and the electric wire 3. When the heat resistant inorganic adhesive 6 is filled, a part of the terminal box 4 that can be opened and closed is closed.
When the filled heat resistant inorganic adhesive 6 is cured, the electric wire 3 in the terminal box 4 is fixed by the cured heat resistant inorganic adhesive 6 and the ceramic cylinder 5.

  Since the ceramic cylinder 5 and the heat-resistant inorganic adhesive 6 are used, the electric wire 3 in the terminal box 4 can be securely fixed, there is no possibility of deterioration due to ultraviolet rays, and the explosion-proof function and insulation function are impaired. There is no.

Next, a second example of the present invention will be described with reference to FIGS.
In the second example, the explosion-proof device 2 is an explosion-proof heater (sheath heater), and the holding body 4 is a terminal box provided at a connection location of the explosion-proof heater 2, and the electric wires 3 are connected in the terminal box 4. It is an electric wire (cable).

The terminal box 4 is connected to one side in the longitudinal direction of the explosion-proof heater 2, and two ceramic cylinders 5 are disposed in the terminal box 4 at a predetermined interval in the longitudinal direction.
One ceramic cylinder 5 is provided with a single through-hole 9 through which the base end portion of the electric wire 3 is inserted, and the other ceramic cylinder 6 is inserted through a core wire 7 separated from the base end portion of the electric wire 3. A plurality of through holes 9 are provided. Each lead wire 11 on the heater side is connected to each core wire 7 (including a thermo wire, a ground wire, etc.), and the connecting portion 12 is located in the through hole 9 of the ceramic cylinder 5.

Thus, a retaining means 13 for preventing the ceramic cylinder 5 from moving in the explosion direction is provided between the terminal box 4 and the ceramic cylinder 5.
The retaining means 13 includes an inward projection 14 provided on the terminal box 4 and an outward projection 15 provided on the ceramic cylinder 5 and engaged with the inward projection 14 when moving in the explosion direction. ing. The inward projection 14 and the outward projection 15 are partially formed at equal angles in the circumferential direction.

A heat-resistant inorganic adhesive 6 is filled between the terminal box 4 and the outer periphery of each ceramic cylinder 5 and between each ceramic cylinder 5 and the electric wire 3.
When the filled heat-resistant inorganic adhesive 6 is cured, the electric wire 3 in the terminal box 4 is fixed by the cured heat-resistant inorganic adhesive 6 and each ceramic cylinder 5.

Therefore, as in the first example, such a thing uses the ceramic cylinder 5 and the heat-resistant inorganic adhesive 6 so that the electric wire 3 in the terminal box 4 can be securely fixed and depends on ultraviolet rays. There is no risk of deterioration, and the explosion-proof function and insulation function are not impaired.
In addition, even if the ceramic cylinder 5 attempts to escape from the terminal box 4 in the explosion direction due to an explosion in the explosion-proof device 2, this is prevented by the retaining means 13. Therefore, the explosion-proof function is further improved.

Next, a third example of the present invention will be described with reference to FIG.
In the third example, the explosion-proof device 2 is used as an explosion-proof control panel, and the holding body 4 is used as a cylinder body of switches provided at a penetration portion of the explosion-proof control panel 2, and the wires 3 are penetrated into the cylinder body 4. Electrode.

The cylinder body 4 has a male screw on the outer periphery, and is attached by being screwed into a screw hole formed in the outer wall 16 of the explosion-proof control panel 2.
A ceramic cylinder 5 is provided in the cylinder body 4, and the electrode 3 passes through the through hole 9.
As in the second example, a retaining means 13 having an inward projection 14 and an outward projection 15 is provided between the cylinder body 4 and the ceramic cylinder 5.

A heat-resistant inorganic adhesive 6 is filled between the cylinder body 4 and the ceramic cylinder 5 and between the ceramic cylinder 5 and the electrode 3.
When the filled heat-resistant inorganic adhesive 6 is cured, the electrode 3 in the cylinder body 4 is fixed by the cured heat-resistant inorganic adhesive 6 and the ceramic cylinder 5.
Such a thing can have the same effect as the second example.

Next, a fourth example of the present invention will be described with reference to FIG.
In the fourth example, the explosion-proof device 2 is used as an explosion-proof control panel, and the holding body 4 is used as a tube main body of indicator lamps provided at a through portion of the explosion-proof control panel 2. It is a heating wire that penetrates.

The cylinder body 4 has a glass cap 17 at the outer end and a male screw at the outer periphery, and is screwed into a screw hole formed in the outer wall 16 of the explosion-proof control panel 2. The lock nut 18 is attached by being screwed to the male screw.
A ceramic cylinder 5 is provided in the cylinder main body 4, and a heating wire (filament) 3 is passed through the through hole 9.
As in the second example, a retaining means 13 having an inward projection 14 and an outward projection 15 is provided between the cylinder body 4 and the ceramic cylinder 5.

A heat-resistant inorganic adhesive 6 is filled between the cylinder body 4 and the ceramic cylinder 5 and between the ceramic cylinder 5 and the heating wire 3.
When the filled heat-resistant inorganic adhesive 6 is cured, the heating wire 3 in the cylinder body 4 is fixed by the cured heat-resistant inorganic adhesive 6 and the ceramic cylinder 5.
Such a thing can have the same effect as the second example.

In the above example, the explosion-proof device 2 is an explosion-proof compressor, an explosion-proof heater, and an explosion-proof control panel.
In the previous example, the electric wires 3 are electric wires, electrodes, and heating wires, but the electric wires 3 are not limited thereto, and may be other than these, for example.
In the previous example, the holding body 4 is a terminal box or a cylinder body, but is not limited thereto, and may be other than these, for example.
In the previous example, the basic shape of the ceramic cylinder 5 is a columnar shape, but is not limited thereto, and may be a prismatic shape, for example.
In the previous example, the heat-resistant inorganic adhesive 6 is a so-called ceramic cement.
In the previous example, the retaining means 13 is composed of the inward projection 14 and the outward projection 15, but is not limited thereto, and is, for example, an inner circumferential groove provided in the holding body 4 and detachably fitted thereto. And a retaining ring that can be brought into contact with the end face of the ceramic cylinder 5.

  DESCRIPTION OF SYMBOLS 1 ... Explosion-proof fixing device, 2 ... Explosion-proof equipment (explosion-proof compressor, explosion-proof heater, explosion-proof control panel), 3 ... Electric wires (electric wire, electrode, heating wire), 4 ... Holding body (terminal box, cylinder body), 5 DESCRIPTION OF SYMBOLS ... Ceramic cylinder, 6 ... Heat-resistant inorganic adhesive, 7 ... Core wire, 8 ... Terminal, 9 ... Through-hole, 10 ... Connection part, 11 ... Lead wire, 12 ... Connection part, 13 ... Stopping means, 14 ... Inward Projection, 15 ... outward projection, 16 ... outer wall, 17 ... glass cap, 18 ... lock nut.

Claims (5)

And explosion proof, a wire such that provided in the through portion of the container wall of the wire such or explosion proof provided at connection points between the electrical device and the wire such that accommodated in the explosion proof, the connecting portion and the said explosion proof a holder for holding the electric wire such provided in the through portion, and a ceramic cylindrical body, wherein the wire class is accommodated in the holding member is penetrated, between the holding member and the ceramic cylinder and said ceramic cylinder body and the heat-resistant inorganic adhesive filled between the wires such, are formed from the outward projection provided on the ceramic cylinder to the inward protrusion and the engagement thereto provided on the holder, the explosion direction and retaining means for preventing movement of the ceramic cylinder to, consists, by the explosion proof and holding member and the ceramic cylinder and heat-resistant inorganic adhesive, explosion-proof locking device, characterized in that securing the explosion proof.   The explosion-proof device is an explosion-proof compressor, the holding body is a terminal box provided at a connection location of the explosion-proof compressor, and the electric wires are wires connected to terminals in the terminal box. Explosion-proof fixing device as described.   2. The explosion-proof fixing according to claim 1, wherein the explosion-proof device is an explosion-proof heater, the holding body is a terminal box provided at a connection location of the explosion-proof heater, and the electric wires are wires connected in the terminal box. apparatus.   2. The explosion-proof device is an explosion-proof control panel, the holding body is a tube main body of switches provided at a penetration portion of the explosion-proof control panel, and the electric wires are electrodes penetrating into the cylinder main body. Explosion-proof fixing device as described in 1.   The explosion-proof device is an explosion-proof control panel, the holding body is a tube main body of indicator lights provided at a penetration portion of the explosion-proof control panel, and the electric wires are heat generating wires penetrating into the cylinder main body. The explosion-proof fixing device according to claim 1.

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