RU2613512C1 - Duplex cooling system of tape acoustic transducer - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: duplex cooling system of the tape acoustic transducer is proposed, which is placed inside the speaker casing. It includes vertically oriented magnets and magnetic cores fixed on them with the slits, in which the frame is located, the height of which exceeds the height of the magnets. Vertical channels, connected with the outside through a labyrinth, are formed between the magnetic cores along the both surfaces of the frame in its central part. A membrane of polyimide film with the electric conductor placed on it in the form of the elongated rectangular spiral, is fixed on the frame . The transducer is fixed with the elongated nuts between the hatches located on the opposite sides of the speaker casing at the distance equal to the height of the frame.

EFFECT: improvement of the system.

6 dwg

Description

The invention relates to electrical engineering, in particular to the design of a tape acoustic transducer, and can be used for concert acoustic systems (linear arrays, passive and active speaker systems).

The prior art designs of tape drivers from the companies "SLS Audio" (www.slsaudio.com), "Alcons Audio" (www.alconsaudio.com). "Stage Accompany" (www.staqeaccompany.com).

The closest analogue of the proposed technical solution is a tape driver (application for US patent No. 20088212823, 09/04/2008), including a housing with cooling fins extending from the outside and in the longitudinal direction. In the body part there is a frame, which consists of a frame and stripes. A polyimide film membrane is glued to the frame, an electrically conductive structure is located on the membrane, which causes the membrane to vibrate when an electric signal is transmitted from the amplifier to the loudspeaker. The transducer contains magnets forming a constant magnetic field surrounding the membrane conductor structure. The conductor structure is made in the form of an electrically conductive wire, which is placed in the form of an elongated rectangular spiral on one side of the membrane.

Known tape drivers are characterized in that the converters are made with closed housings. Such devices have less long-term power of the converter, due to the uneven removal of hot air from the membrane on one side only.

The task of the invention is aimed at increasing the power of known designs of tape converters.

The technical result of the claimed technical solution is to increase the ultimate long-term power of the membrane.

The claimed technical result is ensured by the design of a double-sided cooling system of the tape acoustic transducer located inside the speaker body, including vertically oriented magnets with magnetic cores, in the slots of which there is a frame whose height exceeds the height of the magnets, while along both surfaces of the frame, in the region of the central part frames between the magnetic cores, vertical channels are formed, a membrane of a polyimide film is fixed to the frame with on it, on the one hand, by an electrically conductive wire in the form of an elongated rectangular spiral, in the magnetic circuits parallel to the frame there are studs fixed with elongated nuts, the magnetic circuits are attached to the covers of the hatches by means of a screw inserted into each extended nut, while the hatches are fixed on opposite sides of the inner surface of the plywood case acoustic speakers.

The technical result is achieved due to the fact that along both surfaces in the region of the central part of the frame between the magnetic cores, vertical channels are made for convection air circulation on both sides of the membrane. When the tape converter is operating, the temperature of the conductors rises to 200 ÷ 300 ° C and a double-sided convection draft is formed around the membrane, which increases the maximum permissible long-term power of the membrane, because according to Newton-Richmann law, the heat flux Q from the wall to the medium is proportional to the heat exchange surface F and the temperature difference between the temperature of the solid wall tc and the temperature of the medium t'zh Q = α⋅F (t'st-t'zh). The useful area of the flow of air flow due to open channels increases by 2 times, which makes it possible to remove more thermal energy, thereby lowering the temperature of the film or supplying more power to the tape converter (increasing its useful radiation power of sound waves with the same dimensions).

When attaching the magnetic cores to the hatches between the magnets and the hatches due to the elongated nuts, a space is formed that is associated with the environment.

The tape transducer is separated from the rest of the column by a plywood casing, which is glued in the upper and lower hatch with sound-absorbing materials that absorb the backward wave created by the rear surface of the membrane facing the rear wall of the column. The labyrinth created by the walls of the column housing, the frame and the magnetic system also prevents the passage of the backward wave.

The magnetic circuit located on the side of the surface of the frame facing the rear wall of the column housing is made with a protrusion facing the frame with the membrane, which ensures the concentration of the magnetic field in the area of the conductors.

Placing the frame in the slot of the magnetic circuit eliminates the horizontal displacement of the frame.

Mounting the transducer to the hatch prevents the frame from shifting in the vertical direction.

Further, the solution is illustrated by reference to the figures, which show the following:

FIG. 1 is a general view of an acoustic speaker.

FIG. 2 is a general view of a tape converter.

FIG. 3 - fastening the converter to the hatch cover.

FIG. 4 is a top view of the converter.

FIG. 5 is a top view of the maze.

FIG. 6 - convection air circulation around the membrane.

The tape converter consists of 5 main elements.

A membrane made of a polyimide film 2 is glued to the brass frame 1. An electrically conductive wire in the form of an elongated rectangular spiral is applied to the film, forming a voice coil in a magnetic field. The magnetic field is formed due to the magnets 5 and the magnetic cores 4 glued to them.

The frame 1 is located in the slots 6 of the magnetic cores 4. The slots prevent horizontal displacement of the frame.

The tape converter itself is located inside the column body (Fig. 1 and Fig. 3). Its fastening to the column housing on both sides is carried out using studs 7 passing through the magnetic circuit 4, secured by elongated nuts 8 on both sides of the magnetic circuit. The screw 9 is screwed into the elongated nut 8, securing the cover of the hatch 10, which, in turn, is fixed by screws in the plywood case of the column. Hatch 10 prevents the frame 1 from shifting in the vertical direction. The mounting design of the transducer is symmetrical above and below.

Around the zone of the tape with electrically conductive wires between the magnetic cores, vertical channels 10 are formed, connected with the external environment, for convection air circulation in front and behind (Fig. 4, 5). During operation, the temperature of the conductive wires rises to 200-300 degrees. A double-sided convection rod 11 is formed, schematically shown in FIG. 6, which increases the maximum allowable long-term power of the membrane. A forced increase in traction with a fan is also possible.

The plywood case around the tape transducer, in the region of the upper hatch and in the region of the lower hatch, is glued with sound-absorbing materials 12, which absorb the backward wave 14 generated by the rear side of the membrane. The labyrinth 13 created by the rigid frame 1 also prevents the passage of the backward wave 14.

Claims (1)

A double-sided cooling system for a tape acoustic transducer located inside the speaker casing, characterized in that it includes vertically oriented magnets and magnetic cores fixed to them with slots, in which there is a frame whose height exceeds the height of the magnets, between the magnetic cores along both surfaces of the frame in the region of its central the parts are formed by vertical channels that are connected to the external environment through a maze, a membrane of a polyimide film is fixed to the frame with an electric conductor placed on it in the form of an elongated rectangular spiral, the transducer is fastened by means of elongated nuts between the hatches located on opposite sides of the speaker shell at a distance equal to the height of the frame.

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