A low noise transformer

Abstract

The invention discloses a low-noise transformer, comprising a shell and an iron core arranged inside the shell, a lower clamp seat at the bottom of the shell clamped at the front and rear sides of the iron yoke at the lower part of the iron core, a pair of upper clamping plate assemblies clamped at the front and rear sides of the upper iron yoke of the iron core respectively arranged in the shell, the upper end of the upper clamping plate assembly is slidably connected to the top of the shell, an intermediate spring is connected between the upper parts of the upper clamping plate assembly, the lower part of each lower clamping plate assembly is clamped at the corresponding side of the upper iron yoke of the iron core respectively, a vertical bimetallic strip is arranged at the top of the shell, the upper end of the bimetallic strip is fixed to the top of the shell, and the lower part of the bimetallic strip is connected to the upper clamping plate assembly through a spring. The invention can reduce the noise generated by vibration.

Description

Technical Field

[0001] The invention relates to the field of transformers, in particular to a low-noise transformer. Background Art

[0002] The transformer is generally composed of a shell, an iron core, an oil tank, etc. The iron core includes a core column and an iron yoke, and the coil is wound on the core column. In order to reduce eddy current loss, the existing transformer generally uses a stacked method to combine the iron core. When the iron core of this stacked structure works at a high voltage, adjacent silicon steel sheets will vibrate and collide with each other, which will generate noise, so there is a problem of high noise. Summary of the invention

[0003] The purpose of the present invention is to provide a low-noise transformer to solve the problem of high noise in the transformer of the prior art.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A low-noise transformer comprises an outer shell and an iron core arranged inside the outer shell, the iron core is composed of multiple silicon steel sheets stacked in the front-to-back direction, and is characterized in that: the iron core comprises a vertical core column and upper and lower iron yokes, a lower clamping seat is fixed at the bottom of the outer shell, the lower clamping seat is clamped at the front and rear sides of the lower iron yoke of the iron core, a pair of upper clamping plate assemblies are provided in the outer shell, which are respectively clamped at the front and rear sides of the upper iron yoke of the iron core, the upper end of each upper clamping plate assembly is respectively connected to the top of the outer shell by sliding along the front and rear horizontal directions, and an intermediate spring in a natural state is connected between the upper parts of the upper clamping plate assemblies, the lower part of each lower clamping plate assembly is respectively clamped at the corresponding side of the upper iron yoke of the iron core, and a vertical bimetallic strip is also respectively arranged outside each upper clamping plate assembly at the top of the inner shell, the upper end of the bimetallic strip is fixed to the top of the inner shell, the side with a small thermal expansion coefficient in the bimetallic strip faces the upper clamping plate assembly in the corresponding direction, and the side of the lower part of the bimetallic strip facing the upper clamping plate assembly is connected to the upper clamping plate assembly through a spring in a natural state.

[0006] The low-noise transformer is characterized in that the natural frequency of the iron core avoids the fundamental frequency of hysteresis stretching vibration and the second, third and fourth harmonic frequency bands. The natural frequency of the iron core of the present invention is 350Hz.

[0007] The low-noise transformer is characterized in that the lower clamping seat includes a base and front and rear side seats, the front and rear side seats are respectively clamped on the front and rear sides of the lower iron yoke of the iron core, and the inner walls of the front and rear side seats are respectively fixed with rubber layers, and the rubber layers are in contact with the corresponding sides of the lower iron yoke of the iron core.

[0008] The low-noise transformer is characterized in that a boss is provided on the base of the lower clamping seat, and the top surface of the boss is set as a rough surface to contact the bottom surface of the iron yoke at the lower part of the iron core.

[0009] The low-noise transformer is characterized in that the upper clamping plate assembly is composed of an outer guard plate and an insulating plate, the insulating plate is close to the corresponding side of the upper iron yoke of the iron core, the outer guard plate is close to the insulating plate, the upper end of the outer guard plate is slidably connected to the top of the shell, the middle spring is connected between the upper parts of the outer guard plates, each side spring is connected between the bimetallic strip and the insulating plate of the corresponding side upper clamping plate assembly, and the spring passes through the corresponding side outer guard plate.

[0010] The low-noise transformer is characterized in that a T-shaped guide groove is fixed on the top of the shell, and the upper end of the outer guard plate in each upper clamping plate assembly is respectively set as a T-shaped block matching the T-shaped guide groove, and the upper end of the outer guard plate is respectively slidably installed in the T-shaped guide groove.

[0011] The low-noise transformer is characterized in that the two upper clamping plate assemblies are connected by bolts, the two ends of the bolts respectively pass through the insulating plate and the outer protective plate of the upper clamping plate assembly on the corresponding side, and the bolt protruding ends are locked and fixed by nuts.

[0012] In the present invention, at the upper iron yoke of the iron core, the upper clamping plate assembly is clamped at the front and rear sides of the upper iron yoke of the iron core. When the transformer is working, the high temperature generated inside causes the bimetallic strip to deform, and the lower end of the bimetallic strip bends toward the side with a smaller thermal expansion coefficient, i.e., the direction of the upper clamping plate assembly on the corresponding side, thereby causing the spring to be squeezed to generate a deformation force, which is transmitted to the corresponding side of the upper iron yoke through the upper clamping plate assembly on the corresponding side, thereby overcoming the vibration tendency of the silicon steel sheet in the upper iron yoke toward this side in the front-to-back direction, thereby reducing the noise generated by the vibration.

[0013] In the present invention, at the lower iron yoke of the iron core, the front and rear sides of the lower iron yoke are clamped by a lower clamp seat through a rubber layer, the rubber layer is used to absorb vibration in the front and rear directions, and the rough-surfaced boss is used to contact the bottom surface of the lower iron yoke to increase the energy loss of the silicon steel sheet when it vibrates back and forth, thereby reducing the vibration degree of the silicon steel sheet.

[0014] Compared with the prior art, the present invention can reduce the vibration of silicon steel sheets constituting the iron core during operation, thereby weakening the noise generated by the vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a left view of the structure of the present invention. DETAILED DESCRIPTION

[0016] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0017] like Figure 1 As shown, a low-noise transformer includes a shell 1 and an iron core 2 arranged inside the shell. The iron core 2 is composed of multiple silicon steel sheets stacked in the front-to-back direction. The natural frequency of the iron core 2 avoids the fundamental frequency of hysteresis stretching vibration and the second, third, and fourth harmonic frequency band range.

[0018] The iron core 2 structurally includes a vertical core column and upper and lower iron yokes. A lower clamp seat 3 is fixed to the inner bottom of the housing 1. The lower clamp seat 3 includes a base and front and rear side seats. The front and rear side seats are respectively clamped on the front and rear sides of the lower iron yoke of the iron core 2, and the inner walls of the front and rear side seats are respectively fixed with rubber layers 4, which are in contact with the corresponding sides of the lower iron yoke of the iron core 2. A boss 5 is provided on the base of the lower clamp seat 3, and the top surface of the boss 5 is set as a rough surface to contact the bottom surface of the lower iron yoke of the iron core 2.

[0019] A pair of upper clamping plate assemblies are provided in the upper part of the shell 1, which are clamped on the front and rear sides of the upper iron yoke of the core 2, respectively. The upper clamping plate assembly is composed of an outer guard plate 6 and an insulating plate 7. The insulating plate 6 is close to the corresponding side of the upper iron yoke of the core 2, and the outer guard plate 7 is close to the insulating plate 6. A T-shaped guide groove 8 is fixed on the top of the shell 1. The upper end of the outer guard plate 6 in each upper clamping plate assembly is respectively set as a T-shaped block matching the groove of the T-shaped guide groove 8, and the upper end of the outer guard plate 6 is respectively slidably installed in the T-shaped guide groove 8. An intermediate spring 9 is connected between the upper parts of the outer guard plates. The intermediate spring 9 is in a natural state when the upper clamping plate assembly initially clamps the upper iron yoke of the core. The intermediate spring 9 in the natural state can absorb the vibration of the entire silicon steel sheet in the core.

[0020] A vertical bimetallic strip 10 is provided at the top of the inner part of the outer shell 1 outside each upper clamping plate assembly. The upper end of the bimetallic strip 10 is fixed to the top of the inner part of the outer shell 1. The side of the bimetallic strip 10 with a small thermal expansion coefficient faces the upper clamping plate assembly in the corresponding direction. The lower part of the bimetallic strip 10 faces the upper clamping plate assembly through a spring 11 in a natural state and the insulating plate 7 in the upper clamping plate group, and the spring 11 passes through the outer protective plate 6 in the corresponding upper clamping plate group.

[0021] The two upper clamping plate assemblies are connected by bolts 12. The two ends of the bolts 12 pass through the insulating plate 7 and the outer protective plate 6 of the corresponding upper clamping plate assembly, and the bolts 12 are fixed by nuts.

[0022] The embodiments described in the present invention are merely descriptions of the preferred implementation modes of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made to the technical solutions of the present invention by engineers and technicians in this field should fall within the protection scope of the present invention. The technical contents for which protection is sought in the present invention have all been recorded in the claims.

Claims

1. A low-noise transformer, comprising a housing and an iron core arranged inside the housing, wherein the iron core is composed of a plurality of silicon steel sheets stacked in a front-to-back direction, characterized in that: The iron core includes a vertical core column and upper and lower iron yokes, a lower clamping seat is fixed at the bottom of the shell, the lower clamping seat is clamped at the front and rear sides of the lower iron yoke of the iron core, a pair of upper clamping plate assemblies are provided in the shell, which are respectively clamped at the front and rear sides of the upper iron yoke of the iron core, the upper end of each upper clamping plate assembly is respectively slidably connected to the top of the shell along the front and rear horizontal directions, and an intermediate spring in a natural state is connected between the upper parts of the upper clamping plate assemblies, the lower part of each lower clamping plate assembly is respectively clamped at the corresponding side of the upper iron yoke of the iron core, and a vertical bimetallic strip is also respectively provided outside each upper clamping plate assembly at the top of the shell, the upper end of the bimetallic strip is fixed to the top of the shell, the side of the bimetallic strip with a small thermal expansion coefficient faces the upper clamping plate assembly in the corresponding direction, and the side of the lower part of the bimetallic strip facing the upper clamping plate assembly is connected to the upper clamping plate assembly through a spring in a natural state; The natural frequency of the iron core avoids the fundamental frequency of hysteresis stretching vibration and the second, third and fourth harmonic frequency bands; The lower clamping seat includes a base and front and rear side seats, which are respectively clamped on the front and rear sides of the lower iron yoke of the iron core, and the inner walls of the front and rear side seats are respectively fixed with rubber layers, which are in contact with the corresponding sides of the lower iron yoke of the iron core.

2. A low noise transformer according to claim 1, characterized in that: A boss is arranged on the base of the lower clamp seat, and the top surface of the boss is arranged as a rough surface to contact the bottom surface of the iron yoke at the lower part of the iron core.

3. A low noise transformer according to claim 1, characterized in that: The upper clamping plate assembly is composed of an outer guard plate and an insulating plate. The insulating plate is close to the corresponding side of the upper iron yoke of the iron core, the outer guard plate is close to the insulating plate, the upper end of the outer guard plate is slidably connected to the top of the outer shell, the middle spring is connected between the upper ends of the outer guard plates, and the spring on each side is connected between the bimetallic strip and the insulating plate of the corresponding side upper clamping plate assembly, and the spring passes through the corresponding side outer guard plate.

4. A low noise transformer according to claim 3, characterized in that: A T-shaped guide groove is fixed on the top of the shell, and the upper end of the outer guard plate in each upper clamping plate assembly is respectively set as a T-shaped block matching the T-shaped guide groove, and the upper end of the outer guard plate is respectively slidably installed in the T-shaped guide groove.

5. A low noise transformer according to claim 3, characterized in that: The two upper clamping plate assemblies are connected by bolts, and the two ends of the bolts pass through the insulation plate and the outer protective plate of the upper clamping plate assembly on the corresponding side respectively, and the bolt protruding ends are locked and fixed by nuts.

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