A pull-out resistant audio transformer

Abstract

The utility model relates to an anti-pulling audio transformer, comprising a shell and a sealing plate, an installation chamber is arranged between the shell and the sealing plate, a frame is placed in the installation chamber, and two parallel pin seats are arranged on the frame; L-shaped pins are inserted into the pin seats, and the pins extend through the sealing plate to the outside of the shell, and the gaps between the frame and the installation chamber and between the pins and the pin seats are filled with epoxy resin. By injecting epoxy resin into the installation chamber, the epoxy resin is filled in the gaps between the frame and the installation chamber and between the pins and the pin seats to form an insulating layer, and the existence of the insulating layer improves the insulation performance of the transformer, making it difficult for the transformer to discharge. At the same time, L-shaped pins are inserted into the pin seats of the frame, so as to prevent the pins from falling off from the pin seats under the action of external forces; improve the stability between the pins and the pin seats; and enable the entire audio transformer to have the ability to pull.

Description

Technical Field

[0001] The utility model relates to the field of audio transformers, in particular to an anti-pulling audio transformer. Background Art

[0002] Audio transformers are transformers that work in the audio range, also known as low-frequency transformers. The operating frequency range is generally from 10-20000HZ, and they are often used to transform voltage or load impedance. Audio transformers are used as components of voltage amplification, power output and other circuits in radio communications, broadcasting and television, and automatic control. They use the impedance transformation principle to match the output impedance of the speaker and the power amplifier, thereby obtaining the maximum output power.

[0003] The transformer is composed of a coil and an iron core. The coil is supported by a frame and then inserted into the iron core to form the basic form of the transformer. To firmly fix the coil on the frame, the pin is the only and indispensable support point. Although the existing L-shaped pin can be used to wind the coil tightly, the coil is still easy to slip off the winding end of the pin when it is pulled, which can easily cause the welding point to break.

[0004] The leakage magnetic flux and leakage inductance of the existing step-up audio transformer are problems that the production setting of the transformer often needs to face. Reducing the leakage inductance and leakage magnetic flux can greatly improve the performance of the audio transformer. The existing transformer adopts the method of reducing the thickness of the coil insulation layer to reduce the leakage inductance of the transformer, but this reduces the insulation performance of the transformer, which is prone to discharge and affects the safe use of the transformer. Summary of the invention

[0005] The utility model aims to provide a pull-out resistant audio transformer to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a pull-out resistant audio transformer, comprising a shell and a sealing plate, an installation chamber is arranged between the shell and the sealing plate, a frame is placed in the installation chamber, and two parallel pin seats are arranged on the frame; L-shaped pins are inserted into the pin seats, and the pins extend through the sealing plate to the outside of the shell, and the gaps between the frame and the installation chamber and the gaps between the pins and the pin seats are filled with epoxy resin.

[0007] Compared with the prior art, by injecting epoxy resin into the installation chamber, the epoxy resin is filled in the gap between the frame and the installation chamber and the gap between the pin and the pin seat to form an insulating layer. The existence of the insulating layer improves the insulation performance of the transformer, making it difficult for the transformer to discharge. At the same time, L-shaped pins are inserted into the pin seat of the frame to prevent the pin from falling off from the pin seat under the action of external force; the stability between the pin and the pin seat is improved; and the entire audio transformer has the ability to be pulled out.

[0008] The utility model is a further improvement of the pull-out resistant audio transformer. The sealing plate is provided with a plurality of mounting holes for pins to pass through and a glue injection hole for injecting epoxy resin into the mounting chamber.

[0009] A further improvement of the pull-out resistant audio transformer of the utility model is that the skeleton also includes a winding column, a baffle is provided at one end of the winding column, a pin seat is provided at the other end of the winding column, a winding groove for winding the coil is provided between the pin seat and the baffle, and an insertion hole for inserting the iron core is provided on the winding column along the axial direction.

[0010] The utility model is a further improvement on the pull-out resistant audio transformer, in which two pin seats are directly provided with notches which are connected to the insertion holes.

[0011] The utility model is a further improvement of the pull-out resistant audio transformer. A plurality of steps are arranged on the side of the pin seat. Through holes are provided on the steps. The pins are inserted into the through holes.

[0012] A further improvement of the pull-out resistant audio transformer of the utility model is that the pin includes a limit rod and a connecting rod, the cross-sectional shape of the connecting rod is the same as the cross-sectional shape of the through hole; the connecting rod is inserted into the through hole and extends to the outside of the shell through the mounting hole of the sealing plate, and the limit rod abuts against the surface of the step.

[0013] Compared with the prior art, the limiting rod abuts against the surface of the step, thereby preventing the pins from falling off the pin holder under the action of external force, improving the stability between the pins and the pin holder, and enabling the entire audio transformer to have the ability to be pulled out.

[0014] A further improvement of the pull-out resistant audio transformer of the utility model is that the step is recessed into the pin seat or extends out of the pin seat.

[0015] The utility model is a further improvement on the pull-out resistant audio transformer, in which the cross-sectional shape of the through hole is circular or multi-deformed.

[0016] In addition to the technical problems solved by the present invention, the technical features that constitute the technical solution, and the advantages brought by the technical features of the technical solution described above, other technical problems that can be solved by the present invention, other technical features included in the technical solution, and the advantages brought by these technical features will be further described in detail in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an exploded view of a pull-out resistant audio transformer.

[0018] Figure 2 It is a side view cross-section of a pull-out resistant audio transformer.

[0019] Explanation of the accompanying figures: 01. Shell, 02. Installation chamber, 03. Closing plate, 04. Installation hole, 05. Glue injection hole, 06. Frame, 07. Winding column, 08. Baffle, 09. Pin seat, 10. Winding groove, 11. Insert hole, 12. Notch, 13. Step, 14. Through hole, 15. Pin, 16. Limit rod, 17. Connecting rod, 18. Epoxy resin. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0021] like Figure 1-2 As shown, the audio transformer of the utility model has a metal shell 01, a mounting chamber 02 is arranged in the shell 01, a sealing plate 03 is arranged at the opening of the mounting chamber 02, and a plurality of mounting holes 04 and a glue injection hole 05 are arranged on the sealing plate 03. The sealing plate 03 and the shell 01 are fixedly installed at the opening of the mounting chamber 02 by pressing. A skeleton 06 is placed in the mounting chamber 02, and the skeleton 06 is injection molded by nylon or other materials. The skeleton 06 includes a winding column 07, a baffle 08 is integrally formed at one end of the winding column 07, and two parallel pin seats 09 are integrally formed at the other end of the winding column 07, and a winding groove 10 for winding a coil is arranged between the pin seat 09 and the baffle 08, and an insertion hole 11 for inserting an iron core is arranged on the winding column 07 along the axial direction, and the two pin seats 09 are directly provided with a notch 12 connected to the insertion hole 11, and the iron core is located in the notch 12. Several steps 13 are arranged on the side of the pin seat 09, and the steps 13 are recessed into the pin seat 09 or extend out of the pin seat 09. A through hole 14 is provided on the step 13, and the axis of the through hole 14 is arranged parallel to the axis of the insertion hole 11. The cross-sectional shape of the through hole 14 is circular or deformed. The cross-sectional shape of the through hole 14 is preferably polygonal, such as a triangle, a quadrilateral, etc., and the axis of the through hole 14 is parallel to the axis of the insertion hole 11. An L-shaped pin 15 is inserted into the through hole 14, and the pin 15 includes a limit rod 16 and a connecting rod 17 formed by bending, and the cross-sectional shape of the connecting rod 17 is the same as the cross-sectional shape of the through hole 14. The cross-sectional shapes of the through hole 14 and the connecting rod 17 are both polygonal designs to prevent the pin 15 from rotating in the through hole 14. The connecting rod 17 is inserted into the through hole 14 and passes through the mounting hole 04 of the sealing plate 03 to connect with the external electronic components, while the limiting rod 16 abuts against the surface of the step 13 and is fixedly connected to the coil on the winding column 07 by welding. The pin 15 is designed to be L-shaped. When a pulling force is applied to the connecting rod 17, the limiting rod 16 abuts against the surface of the step 13. This prevents the pin 15 from falling off the pin seat 09, thereby improving the stability between the pin 15 and the pin seat 09.

[0022] During assembly, the coil is first wound on the winding column 07, and then the pins 15 are inserted on different steps 13 according to the needs. The coil and the pins 15 are fixedly connected by welding. The skeleton 06 is made. Then the skeleton 06 is placed in the installation chamber 02 in the shell 01, and the cover is pressed into the shell 01. The pins 15 on the pin seat are extended to the outside of the shell 01 through the installation holes 04 on the cover plate 02 to facilitate the connection of the pins 15 with external electronic components. Finally, epoxy resin 18 is injected into the installation chamber 02 through the injection holes 05, so that the epoxy resin 18 fills the gap between the skeleton 06 and the installation chamber 02 and the gap between the pins 15 and the through holes 14 on the step 13. Enhance the overall mechanical strength of the audio transformer and make the transformer more durable. Epoxy resin 18 can seal the internal parts of the transformer to prevent external dust or moisture from entering, thereby increasing the service life of the transformer. At the same time, potting epoxy resin 18 in the installation chamber 02 can reduce the noise in the transformer.

[0023] If there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0024] The above implementation modes are merely descriptions of the preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineering and technical personnel in the field shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A pull-out resistant audio transformer, characterized in that: It includes a shell and a sealing plate, an installation chamber is arranged between the shell and the sealing plate, a frame is placed in the installation chamber, and two parallel pin seats are arranged on the frame; L-shaped pins are inserted on the pin seats, and the pins pass through the sealing plate and extend outside the shell, and the gaps between the frame and the installation chamber and the gaps between the pins and the pin seats are filled with epoxy resin.

2. The pull-out resistant audio transformer according to claim 1, characterized in that: The sealing plate is provided with a plurality of mounting holes for pins to pass through and a glue injection hole for injecting epoxy resin into the mounting chamber.

3. The pull-out resistant audio transformer according to claim 2, characterized in that: The frame also includes a winding column, a baffle is arranged at one end of the winding column, a pin seat is arranged at the other end of the winding column, a winding groove for winding the coil is arranged between the pin seat and the baffle, and an insertion hole for inserting the iron core is arranged on the winding column along the axial direction.

4. The pull-out resistant audio transformer according to claim 3, characterized in that: The two pin seats are directly provided with notches which are connected through the insertion holes.

5. The pull-out resistant audio transformer according to claim 4, characterized in that: A plurality of steps are arranged on the side surface of the pin seat, and through holes are arranged on the steps, and the pins are inserted into the through holes.

6. The pull-out resistant audio transformer according to claim 5, characterized in that: The pin includes a limiting rod and a connecting rod, the cross-sectional shape of the connecting rod is the same as that of the through hole; the connecting rod is inserted into the through hole and extends outside the shell through the mounting hole of the sealing plate, and the limiting rod abuts against the surface of the step.

7. The pull-out resistant audio transformer according to claim 6, characterized in that: The step is recessed into the pin seat or extends outward from the pin seat.

8. The pull-out resistant audio transformer according to claim 7, characterized in that: The cross-sectional shape of the through hole is circular or deformed.

Images