JPH066415Y2 - Waterproof seal structure for underwater floodlight - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an underwater floodlight used under high water pressure such as deep sea, and particularly a waterproof structure in an insertion portion of an electric wire to be inserted into the lamp body from a rear portion of the lamp body. Related to the improvement of.

[Conventional technology]

As shown in FIG. 4, the conventional underwater floodlight has a lamp body 5 as shown in FIG.
A light source 51 such as a halogen lamp is attached to the front end opening of No. 0, and the end of the power supply wire 54 inserted into the lamp body 50 through the wire insertion hole 53 that is transparently provided in the rear lid 52 that seals the rear end opening. Socket 55 whose part is configured inside the lamp body 50
And supplies electric power to the light source 51 through the socket 55. A screw groove 56, which can be inserted from the rear opening end side, is threaded on the inner periphery of the electric wire insertion hole 53 that is transparently provided in the rear lid 52, and a step portion 57 is provided inside the front opening end.
The stepped portion 57 is provided with a gland packing 58 that covers the electric wire 54, and is fixed to a rubber sheath 59 formed at the end portion of the electric wire 54. 61 is screwed in, and the packing 58 is pressed against the step 57 by the rotation input of the tightening gland 61,
A waterproof seal is provided on the insertion portion of the electric wire 54 inserted into the lamp body 50 from the rear opening end of the rear lid 52. Further, the light source 51 which is projected from the front end opening of the lamp body 50 and is held at the substantially focal position of the reflecting mirror 62 supported in front of the lamp body 50 has a volume large enough to accommodate the protruding amount of the light source 51. The globe 63 is airtightly covered, and the globe 63 and the globe mount 64 are closely fixed to the opening edge of the front end of the lamp body 50 via sealing materials 65 and 66.

[Problems to be solved by the device]

However, according to the above-mentioned conventional waterproof structure of the underwater floodlight, since it is used in water under high water pressure such as deep sea, the internal pressure of the lamp body 50 changes when the light source 51 such as a halogen lamp is turned on and off. As a result, the balance with respect to the water pressure, that is, the external pressure, which is supported via the lamp main body 50, the globe 63 and the globe mounting base 64 that are formed therein changes. As a result, especially when the internal pressure in the lamp body 50 decreases, the water that has infiltrated the coating of the electric wire 54 is sucked into the lamp body 50, damaging the electric system such as the built-in socket 55, the globe 63, etc. Causes retreat to and from the inside and outside of the lamp body 50 to increase or decrease the load on the sealing materials 65 and 66 such as O-rings, thereby inducing water from the sealing portion to accelerate deterioration of the sealing material and cause deterioration of water resistance and pressure resistance. There was a problem of becoming.

The present invention was created in view of the above problems, and constantly adjusts the water resistance in the lamp body by adjusting the balance with the external pressure according to the change in the internal pressure when the light source is turned on or off. It is also an object of the present invention to provide a waterproof seal structure for an underwater floodlight which maintains pressure resistance, prevents water from being sucked from the inside of the electric wire coating, and does not cause deterioration of the sealing material.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, a waterproof seal structure for an underwater floodlight according to the present invention has a cylinder that doubles as a rear lid slidably installed in the rear part of the lamp body, and the inside and outside of the cylinder communicate with the axial center part of the cylinder. The electric wire insertion hole is formed, and a screw groove that can be inserted from the rear opening end is screwed on the inner circumference of the electric wire insertion hole, and a step is formed inside the opening end, and the electric wire is formed on the step. After inserting the exterior gland packing, insert a tightening gland with a screw groove on the outer circumference from the rear opening end and screw it in, and press the packing against the step to open the front opening end of the cylinder. The groove is formed so as to make a waterproof seal on the part.

[Action]

Thus, according to the waterproof seal structure of the underwater floodlight according to the present invention, when the light source such as the halogen lamp mounted on the lamp body is turned on and the internal pressure of the lamp body rises, the cylinder also serving as the rear lid resists the external pressure. A pushing-back force is generated to move the cylinder to a position where the internal pressure and the external pressure are balanced.
When the light source goes off and the internal pressure of the lamp body drops,
The cylinder is pushed back into the lamp body by the external pressure and moves to a position where the external pressure and the internal pressure are balanced. That is, the internal pressure and external pressure applied to the main body of the lamp are constantly balanced by moving the cylinder that also functions as the rear lid in response to the change in the internal pressure caused by turning on or off the light source. It does not impose a heavy load.

〔Example〕

A preferred embodiment of a waterproof seal structure for an underwater floodlight according to the present invention will be described below with reference to the drawings.

In FIG. 1 and FIG. 2, reference numeral 1 denotes a lamp main body, and inside the lamp main body 1, a cylinder 2 also serving as a rear lid that slides freely in the axial direction is installed, and the cylinder 2 has a substantially central portion in the axial direction. The structure is such that the inside and outside of the cylinder 2 are communicated with each other through an electric wire insertion hole 3 which is transparently provided in the portion, and an electric wire B extending from an external power source and having a gok sheath A at the tip is fixed to the rubber sheath A. From the tightening gland 4 inserted into the lamp body 1 through the wire insertion hole 3 of the cylinder 2, the end portion thereof is connected to the socket 5 arranged and fixed in the lamp body 1 to obtain electrical conduction. To configure.

That is, a screw groove 6 which can be turned in from a rear opening end is formed on the inner periphery of the wire insertion hole 3 formed at the substantially central portion in the axial direction of the cylinder 2, and a step portion 7 is formed inside the opening end. After inserting the gland packing 8 which is sheathed on the electric wire B into the stepped portion 7, the tightening gland 4 having the screw groove 9 threaded on the outer periphery is screwed in from the rear opening end side, and the packing 8 is pressed to be brought into close contact with the front opening end portion (arrow X portion) of the cylinder 2 including the stepped portion 7, and a waterproof seal is provided on the portion. The cylinder 2 has an internal pressure inside the lamp body 1 and a water pressure applied outside the lamp body 1, that is,
Corresponding to changes in balance with external pressure, the electric wire B is fixed by the tightening gland 4 and freely slides in the lamp body 1 in the axial direction (direction of arrow Y). Even if the inside of the lamp body 1 becomes low in pressure, the electric wire B is covered even when the internal pressure of the lamp body 1 balances with the change of the internal pressure due to the turning on or off of the light source 12 such as a halogen lamp protruding from the portion 10 into the globe 11. It is possible to prevent the water that has been flooded inside from being sucked into the lamp body 1 and flooded.

13 is a waterproof O-ring wound around the outer circumference of the cylinder 2 to provide a waterproof seal between the cylinder 2 and the inner peripheral sliding surface of the lamp body 1, and 14 is a loosening prevention member for the tightening gland 4 with respect to the cylinder 2. The fixing ring 15 is also a stopper for preventing the cylinder 2 from falling off from the rear opening end of the lamp body 1.

As described above, the light source 12 is hermetically covered by the globe 11 fixed to the globe mount 16 and is held at a substantially focal position of the reflecting mirror 17 fixed to the front face of the globe mount 16. . Glove mount 16
Is approximately the same size as the front end surface 19 including the flange portion 18 formed on the peripheral edge of the front end portion of the lamp body 1, and the end surface of the flange portion 20 formed at the rear portion of the globe 11 contacts the surface side thereof. A ring-shaped groove 21 is formed in the portion, and a groove 22 included in the surface that contacts the front end surface 19 of the lamp body 1 is formed on the back surface side. Thus, with the O-ring 23 for sealing interposed in the concave groove 21 on the front surface side, the collar portion 20 of the globe 11 is pressure-contacted from the outer side thereof, and the pressing plate 24 is further covered from the outer side thereof to form a plurality of The globe 11 is fixed on the globe mount 16 by fixing screws 25, 25 .... In addition, the globe mounting base 16 is provided with a plurality of O-rings 26 for sealing which are inserted from the side of the flange portion 18 formed at the front end portion of the lamp body 1 after the O-ring 26 for sealing is provided in the concave groove 22 formed on the back surface side. The structure is such that it is directly fixed by the fixing screw 27. With this configuration, the external pressure applied to the globe 11 can be supported on the surface of the globe mounting base 16, and physical deterioration of the sealing O-rings 23 and 26 can be prevented.

Further, in the present embodiment, the reflecting mirror 17 is fixed on the globe mounting base 16 with a plurality of fixing screws 29 via a spacer 28.

The shape of the globe mount 16, the fixing method for the lamp body 1, the fixing method for the reflecting mirror 17 and the like are not limited to those in the above embodiments, and it is needless to say that appropriate modifications can be made.

[Effect of device]

Since the waterproof seal structure in the underwater floodlight according to the present invention is configured as described above, the cylinder is slid even when the internal pressure in the lamp body is changed by turning off or turning on the light source such as the halogen lamp housed in the globe. It keeps the balance with the external pressure by moving it, prevents suction to the inside of the lamp body against the infiltration of water inside the electric wire coating, and prevents the deterioration of the sealing material such as the O-ring, improving the waterproof and pressure resistance of the lamp body and sealing it. It is possible to provide a highly efficient underwater floodlight, and the practical effect after implementing the present invention is extremely large.

[Brief description of drawings]

FIG. 1 is a partially crushed side sectional view showing a preferred embodiment of a waterproof seal structure for an underwater floodlight according to the present invention, and FIG. 2 is an enlarged side sectional view of an essential part showing a structure of a cylinder component also serving as a rear lid. FIG. 3 is an enlarged side sectional view showing the structure of the globe mount, and FIG. 4 is a side sectional view showing a conventional underwater floodlight. 1 ... Lamp body, 2 ... Cylinder 4 ... Tightening gland, 7 ... Step section 8 ... Packing, 12 ... Light source A ... Rubber sheath, B ... Electric wire

Claims (1)

[Scope of utility model registration request] 1. A cylinder which doubles as a rear lid is slidably mounted inside a rear portion of a lamp body, and an electric wire insertion hole communicating between the inside and the outside of the cylinder is opened at a substantially central portion in the axial direction of the cylinder. After threading a screw groove that can be turned in from the rear opening end on the circumference, forming a step inside the front opening end, and inserting a gland packing exterior to the electric wire in the step,
From the rear opening end side, a tightening gland having a screw groove engraved on the outer periphery is screwed in, and the packing is pressed and deformed to make a waterproof seal of the front opening of the cylinder. Waterproof seal structure for underwater floodlights.