A mutual inductor with waterproof structure design

Abstract

The application discloses a transformer with a waterproof structure design, which belongs to the technical field of transformers and comprises an upper shell, a lower shell, an upper iron core located in the upper shell and a lower iron core located in the lower shell, an upper blocking sheet sleeved outside the upper iron core and a lower blocking sheet sleeved outside the lower iron core, a fixed sealing ring arranged outside the upper blocking sheet, a movable sealing ring connected to the lower blocking sheet through a heat expansion body, and the movable sealing ring being located outside the fixed sealing ring. The blocking sheet is connected between the sealing ring and the iron core, so that the sealing ring is prevented from directly contacting the iron core, and the effect of the existing conventional direct application of the sealing ring is achieved under low temperature. When the temperature inside the transformer is high, the heat expansion body expands to drive the movable sealing ring away from the fixed sealing ring, and a heat discharge channel is reserved in the blocking sheet. The heat can be effectively discharged, the accumulated water vapor in the transformer can be discharged, and the service life of the transformer is greatly prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mutual inductor, in particular to a mutual inductor with waterproof structure design. BACKGROUND

[0002] The mutual inductor is also called instrument transformer, which is the general term of current transformer and voltage transformer. It can change high voltage into low voltage and large current into small current, and is used for measurement or protection system. Its function is mainly to change high voltage or large current into standard low voltage (100V) or standard small current (5A or 1A, both refer to rated value) in proportion, so as to realize the standardization and miniaturization of measuring instrument, protection equipment and automatic control equipment.

[0003] The existing mutual inductor increases sealing ring on the shell of the exposed iron core section periphery to prevent water or air from entering the iron core section, thereby preventing rust. However, the water vapor in the air can still enter the mutual inductor, and under the action of the sealing ring, the water vapor in the mutual inductor is not easy to discharge, resulting in more and more water vapor in the mutual inductor, and the iron core section is prone to rust, which leads to poor conversion accuracy and stability of the mutual inductor, and even cannot work normally, resulting in negative effect of the sealing ring, and the sealing ring directly contacts with the iron core, and the heat generated by the working of the iron core is easy to cause the sealing ring to be easily aged, so that its function is lost. SUMMARY

[0004] This section aims to summarize some aspects of the embodiments of the present application and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the title of the invention to avoid obscuring the purpose of this section, the abstract of the specification and the title of the invention, and such simplifications or omissions cannot be used to limit the scope of the present application.

[0005] Therefore, the purpose of the present application is to provide a mutual inductor with waterproof structure design, which can avoid direct contact between the sealing ring and the iron core, and not only can effectively discharge heat, but also can discharge the accumulated water vapor in the mutual inductor, greatly improving the service life of the mutual inductor.

[0006] To solve the above technical problems, the present application provides a mutual inductor with waterproof structure design, which adopts the following technical scheme: including an upper shell, a lower shell, an upper iron core located in the upper shell and a lower iron core located in the lower shell, further comprising an upper barrier sheet sleeved outside the upper iron core and a lower barrier sheet sleeved outside the lower iron core, a fixed sealing ring is arranged outside the upper barrier sheet, the lower barrier sheet is connected with a movable sealing ring through a heat expansion body, and the movable sealing ring is located outside the fixed sealing ring.

[0007] Optionally, the upper barrier sheet, the lower barrier sheet and the fixed sealing ring have the same structure, which can adopt square, rectangular, circular or elliptical cross section.

[0008] By adopting the technical scheme, the upper barrier sheet, the lower barrier sheet and the fixed sealing ring are all designed in the same structure as the upper core and the lower core, and the upper barrier sheet, the lower barrier sheet and the fixed sealing ring are selected in different shapes according to the shape of the end face of the core.

[0009] Optionally, when the heat expansion body does not expand normally, the movable sealing ring and the fixed sealing ring are cross-stuck.

[0010] By adopting the technical scheme, when the temperature inside the transformer is not high, the movable sealing ring and the fixed sealing ring can play a sealing role and prevent water and dust.

[0011] Optionally, the upper barrier sheet is connected between the upper core and the upper shell through the reinforcing rib, and the lower barrier sheet is connected between the lower core and the lower shell through the reinforcing rib.

[0012] By adopting the technical scheme, the connection of the upper barrier sheet and the lower barrier sheet is realized, and the support strength of the upper barrier sheet and the lower barrier sheet is ensured.

[0013] Optionally, the end of the fixed sealing ring and the movable sealing ring close to each other is provided with a wedge surface, and the wedge surface of the fixed sealing ring faces the wedge surface of the movable sealing ring.

[0014] By adopting the technical scheme, when the upper shell and the lower shell are buckled, under the action of the wedge surfaces of the fixed sealing ring and the movable sealing ring close to each other, the fixed sealing ring and the movable sealing ring can be inserted and kept closely stuck, so as to ensure the sealing effect.

[0015] Optionally, the surface of the upper barrier sheet close to the upper core and the inner surface of the lower barrier sheet close to the lower core are both provided with a plurality of through grooves.

[0016] By adopting the technical scheme, the through grooves provide a channel for heat generated by the core in the shell to be discharged.

[0017] Optionally, the end of the upper barrier sheet and the lower barrier sheet close to each other does not contact.

[0018] By adopting the technical scheme, the barrier sheet can avoid the direct contact of the sealing ring with the core, and the end of the upper barrier sheet and the lower barrier sheet close to each other also reserves a channel for heat to be discharged.

[0019] Optionally, the heat expansion body comprises a cylinder, a telescopic rod is inserted into the cylinder, one end of the telescopic rod is connected with the movable sealing ring, the other end of the telescopic rod abuts against an alcohol bag arranged in the cylinder, and a spring is connected between the end of the telescopic rod abutting against the alcohol bag and the inner wall of the side of the cylinder away from the alcohol bag.

[0020] When the heat inside the mutual inductor is not dissipated and reaches a certain temperature, the alcohol bag expands to drive the movable sealing ring at one end of the telescopic rod away from the fixed sealing ring, realizing the air circulation between the inside and outside of the mutual inductor. Since the pressure inside the mutual inductor is large, when the movable sealing ring is opened, the heat inside the mutual inductor is discharged together with the moisture in the mutual inductor, and when the temperature decreases, the fixed sealing ring returns to adhere to the movable sealing ring.

[0021] Optionally, a heat-conducting block is embedded at the end of the cylinder body away from the telescopic rod, one side of the heat-conducting block is attached to the alcohol bag, and the other side of the heat-conducting block is in contact with the lower iron core through the lower barrier sheet.

[0022] By adopting the above technical scheme, the heat-conducting block can quickly transfer the heat inside the mutual inductor to the alcohol bag, so that the alcohol bag can expand or return to the initial state according to the internal temperature of the mutual inductor.

[0023] Optionally, a plurality of wiring sealing sleeves are uniformly distributed on the upper shell.

[0024] By adopting the above technical scheme, the sealing property at the wiring position is ensured.

[0025] In summary, the present application has at least one of the following beneficial effects:

[0026] By connecting the barrier sheet between the sealing ring and the iron core, the sealing ring can be prevented from directly contacting the iron core, and under the action of the heat-expandable body, the fixed sealing ring and the movable sealing ring can achieve the effect of the conventional direct application of the sealing ring at low temperature. When the internal temperature of the mutual inductor is high, the heat-expandable body expands to drive the movable sealing ring away from the fixed sealing ring, and the barrier sheet provides a channel for heat dissipation. Not only can the heat be effectively dissipated, but also the moisture accumulated in the mutual inductor can be discharged, greatly improving the service life of the mutual inductor. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0028] Fig. 1 is a structural schematic diagram of the present application;

[0029] Fig. 2 is a structural schematic diagram of the barrier sheet of the present application;

[0030] Fig. 3 is a structural schematic diagram of the heat-expandable body of the present application.

[0031] Explanation of reference signs: 1, upper shell; 2, lower shell; 3, upper core; 4, lower core; 5, upper barrier sheet; 501, through slot; 6, lower barrier sheet; 7, fixed sealing ring; 8, heat expansion body; 801, cylinder body; 802, telescopic rod; 803, alcohol bag; 804, spring; 805, heat conducting block; 9, movable sealing ring; 10, reinforcing rib; 11, wiring sealing sleeve; 12, wedge surface. DETAILED DESCRIPTION

[0032] The following will be described in detail with reference to the accompanying drawings. Figs. 1-3 The application will be further described in detail.

[0033] Example 1

[0034] With reference to the accompanying drawings, Figs. 1-3 The application discloses a mutual inductor with a waterproof structure design, which comprises an upper shell 1, a lower shell 2, an upper core 3 located in the upper shell 1 and a lower core 4 located in the lower shell 2. The core of the embodiment can adopt a common horseshoe shape, and the end face is rectangular. The upper core 3 is sleeved with an upper barrier sheet 5 outside, and the lower core 4 is sleeved with a lower barrier sheet 6 outside. The upper barrier sheet 5 is connected between the upper core 3 and the upper shell 1 through a reinforcing rib 10, and the lower barrier sheet 6 is connected between the lower core 4 and the lower shell 2 through a reinforcing rib 10, so as to realize the connection of the upper barrier sheet 5 and the lower barrier sheet 6 and guarantee the support strength of the upper barrier sheet 5 and the lower barrier sheet 6.

[0035] The upper barrier sheet 5 is provided with a fixed sealing ring 7 outside, the lower barrier sheet 6 is connected with a movable sealing ring 9 through a heat expansion body 8, and the movable sealing ring 9 is located outside the fixed sealing ring 7. The upper barrier sheet 5, the lower barrier sheet 6 and the fixed sealing ring 7 all adopt a rectangular shape same as that of the upper core 3 and the lower core 4,

[0036] When the movable sealing ring 9 does not expand normally under the heat expansion body 8, the movable sealing ring 9 is cross-laminated with the fixed sealing ring 7, that is, when the temperature inside the mutual inductor is not high, the movable sealing ring 9 and the fixed sealing ring 7 can play a sealing role and play a waterproof and dustproof role. The upper barrier sheet 5 and the lower barrier sheet 6 are not in contact with each other at one end close to each other. The upper barrier sheet 5 and the lower barrier sheet 6 are not in contact with each other at one end close to each other. The through slot 501 provides a channel for heat generated by the core in the shell to be discharged. The barrier sheet can avoid the direct contact of the sealing ring with the core, and the one end close to each other of the upper barrier sheet 5 and the lower barrier sheet 6 also reserves a channel for heat to be discharged.

[0037] In addition, the upper shell 1 is uniformly provided with a plurality of wiring sealing sleeves 11 to guarantee the sealing property of the wiring.

[0038] Working principle: In overcast, rainy days or at night when the temperature is not high, the temperature inside the mutual inductor will not be too high due to its own heat dissipation effect. At this time, the movable sealing ring 9 and the fixed sealing ring 7 intersect and fit, which plays a waterproof and dustproof role, and achieves the effect of the existing conventional direct application of the sealing ring. When the temperature is high, the mutual inductor cannot dissipate heat, and the temperature inside the mutual inductor will reach the expansion temperature requirement of the heat expansion body 8. At this time, the heat expansion body 8 will expand to drive the movable sealing ring 9 away from the fixed sealing ring 7. Under the action of the heat dissipation channel at the end where the through slot 501, the upper barrier piece 5 and the lower barrier piece 6 are close to each other, the heat inside the mutual inductor will be dissipated when the movable sealing ring 9 is opened. Not only can the heat be effectively dissipated, but also the water vapor accumulated in the mutual inductor can be discharged, solving the problem that the water vapor in the mutual inductor is not easy to discharge, which causes the water vapor in the mutual inductor to increase, the cross section of the iron core is easy to be damp and rust, which causes the mutual inductor to change the precision and stability, and even cannot work normally. When the temperature decreases, the heat expansion body 8 is not much affected by the temperature environment, and the volume returns to normal, and the movable sealing ring 9 and the fixed sealing ring 7 continue to intersect and fit.

[0039] Example two

[0040] With reference to Figs. 1-2 , based on the same concept as the above embodiment one, the mutual inductor with a waterproof structure design further comprises a wedge surface 12 at the end where the fixed sealing ring 7 and the movable sealing ring 9 are close to each other, and the wedge surface 12 of the fixed sealing ring 7 faces the wedge surface 12 of the movable sealing ring 9. When the upper shell 1 and the lower shell 2 are buckled, under the action of the wedge surface 12 at the end where the fixed sealing ring 7 and the movable sealing ring 9 are close to each other, the fixed sealing ring 7 and the movable sealing ring 9 can be inserted and kept close to each other, ensuring the sealing effect.

[0041] Example three

[0042] With reference to Fig. 2 , based on the same concept as the above embodiment one, the mutual inductor with a waterproof structure design further comprises a heat expansion body 8 including a cylinder body 801, a telescopic rod 802 inserted into the cylinder body 801, one end of the telescopic rod 802 connected with the movable sealing ring 9, the other end of the telescopic rod 802 abutting with an alcohol bag 803 arranged inside the cylinder body 801, and a spring 804 connected between the end of the telescopic rod 802 abutting with the alcohol bag 803 and the inner wall of the cylinder body 801 away from the alcohol bag 803. A heat conduction block 805 is embedded at the end of the cylinder body 801 away from the telescopic rod 802, one side of the heat conduction block 805 abuts with the alcohol bag 803, and the other side of the heat conduction block 805 contacts with the lower iron core 4 through the lower barrier piece 6.

[0043] The heat-conducting block 805 can quickly transfer the heat in the transformer to the alcohol bag 803, so that the alcohol bag 803 can expand or return to the initial state according to the internal temperature of the transformer. When the heat in the transformer is not dissipated and reaches a certain temperature, the alcohol bag 803 will expand to drive the movable sealing ring 9 at one end of the telescopic rod 802 away from the fixed sealing ring 7, so as to realize the air circulation between the inside and outside of the transformer. Due to the large pressure in the transformer, when the movable sealing ring 9 is opened, the heat in the transformer will be discharged together with the moisture in the transformer, and when the temperature decreases, the fixed sealing ring 7 returns to adhere to the movable sealing ring 9 under the action of the spring 804.

[0044] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application, so: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A transformer with a waterproof structure design, comprising an upper shell (1), a lower shell (2), an upper iron core (3) located in the upper shell (1), and a lower iron core (4) located in the lower shell (2), characterized in that: The upper barrier sheet (5) is externally provided with a fixed sealing ring (7), and the lower barrier sheet (6) is connected with a movable sealing ring (9) through a heat expansion body (8), and the movable sealing ring (9) is located outside the fixed sealing ring (7); The heat expansion body (8) comprises a cylinder body (801), the inside of the cylinder body (801) is inserted with a telescopic rod (802), one end of the telescopic rod (802) is connected with the movable sealing ring (9), the other end of the telescopic rod (802) abuts against an alcohol capsule (803) arranged inside the cylinder body (801), and a spring (804) is connected between the end of the telescopic rod (802) abutting against the alcohol capsule (803) and the inner wall of the side of the cylinder body (801) away from the alcohol capsule (803). The end of the cylinder body (801) away from the telescopic rod (802) is embedded with a heat conduction block (805), one side of the heat conduction block (805) is attached to the alcohol capsule (803), and the other side of the heat conduction block (805) is in contact with the lower iron core (4) through the lower barrier sheet (6).

2. The transformer with waterproof structure design according to claim 1, characterized in that: The upper barrier sheet (5), the lower barrier sheet (6) and the fixed sealing ring (7) are of the same structure and can adopt a square, rectangular, circular or oval cross section.

3. The transformer with waterproof structure design according to claim 2, characterized in that: When the heat expansion body (8) is not expanded normally, the movable sealing ring (9) is cross attached to the fixed sealing ring (7).

4. The transformer with waterproof structure design according to claim 1 or 2, characterized in that: The upper barrier sheet (5) is connected between the upper iron core (3) and the upper shell (1) through a reinforcing rib (10), and the lower barrier sheet (6) is connected between the lower iron core (4) and the lower shell (2) through the reinforcing rib (10).

5. The instrument transformer with a waterproof structural design according to claim 4, characterized in that: The end of the fixed sealing ring (7) and the movable sealing ring (9) close to each other is provided with a wedge surface (12), and the wedge surface (12) of the fixed sealing ring (7) faces the wedge surface (12) of the movable sealing ring (9).

6. The instrument transformer with a waterproof structural design according to claim 1 or 2, characterized in that: The surface of the upper barrier sheet (5) attached to the upper iron core (3) and the inner surface of the lower barrier sheet (6) attached to the lower iron core (4) are both provided with a plurality of through grooves (501).

7. The instrument transformer with a waterproof structural design according to claim 6, characterized in that: The end of the upper barrier sheet (5) and the lower barrier sheet (6) close to each other does not contact.

8. The instrument transformer with a waterproof structural design of claim 1, wherein: The upper shell (1) is uniformly provided with a plurality of wiring sealing sleeves (11).

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