Mechanical anti-leakage sealing structure for transformer

Abstract

The invention relates to the technical field of transformers, and particularly discloses a mechanical anti-leakage sealing structure for a transformer, the mechanical anti-leakage sealing structure comprises a shell and a top cover, the top of the top cover is provided with a connecting assembly, a pressure release valve and a pressure release assembly, the pressure release valve is fixedly mounted at the top of the top cover, and the connecting assembly comprises a limiting sleeve, a mounting mechanism, a threaded sleeve, a sealing mechanism and a positioning mechanism; the threaded sleeve is mounted in the top cover through a mounting mechanism; during assembly, the threaded sleeve is preassembled on the top cover through the mounting mechanism, when the conducting rod in the sleeve penetrates into the movable seat, a chute of the fixed seat drives the positioning block to open to realize no bolt penetration, the rotating disc is rotated to enable the movable sleeve to drive the movable base to move upwards, clamping and sealing pre-tightening of the conducting rod are synchronously completed, a traditional flange bolt pre-tightening procedure is replaced, and the working efficiency is improved. And during operation, the sliding fit of the movable sleeve and the movable base can compensate the dynamic displacement of the sealing interface caused by the fluctuation of the oil temperature, the plastic deformation and aging failure of the sealing element are inhibited, and the leakage failure rate is reduced.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, and in particular to a mechanical leak-proof sealing structure for transformers. Background Technology

[0002] Transformers are the core equipment in power systems that realize the transmission and voltage transformation of electrical energy. They convert alternating current of one voltage level to another through the principle of electromagnetic induction. They are widely used in power generation, transmission and distribution. Their core functions are voltage transformation, current transformation and impedance matching to ensure the efficient transmission of electrical energy under different distances and loads.

[0003] Currently, the bushing and end cover of a transformer are mainly sealed using a connection structure of sealing rings and flanges to ensure the airtightness and liquid tightness of the transformer. However, this sealing solution has two technical problems: First, the flange bolts need to be pre-tightened evenly during assembly, which is a complex process and requires high installation accuracy. Second, under the operating conditions of the transformer, the thermal expansion effect caused by the temperature fluctuation of the insulating oil will cause the oil pressure inside the tank to change periodically, continuously acting on the sealing ring and generating alternating compressive loads, causing the sealing components to fail due to the accumulation of plastic deformation or accelerated material aging, ultimately leading to oil leakage.

[0004] Therefore, there is a need to provide a mechanical leak-proof sealing structure for transformers, which aims to solve the above problems. Summary of the Invention

[0005] The main objective of this invention is to provide a mechanical leak-proof sealing structure for transformers, which can effectively solve the problems in the background art.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A mechanical leak-proof sealing structure for a transformer includes a housing and a top cover. The top of the top cover is provided with a connecting assembly, a pressure relief valve, and a pressure relief component. The pressure relief valve is fixedly installed on the top of the top cover. The connecting assembly includes a limiting sleeve, an installation mechanism, a threaded sleeve, a sealing mechanism, and a positioning mechanism. The threaded sleeve is installed inside the top cover through the installation mechanism, and the limiting sleeve is fixedly connected to the top of the top cover.

[0008] The sealing mechanism includes a movable sleeve and a turntable, the movable sleeve and the turntable are threaded together, a sealing disc is fixedly connected to the bottom of the movable sleeve, and a sealing gasket is fixedly connected to the top of the sealing disc.

[0009] The positioning mechanism includes a movable seat slidably connected inside the movable sleeve, four movable blocks slidably connected inside the movable seat, a guide rod fixedly connected inside the movable block, a fixed seat slidably connected between the guide rod and the movable block, the fixed seat passing through the movable sleeve and fixedly connected to the inner wall of the threaded sleeve, and a positioning block fixedly connected to the outer side of the movable block by a spring.

[0010] As a further improvement to the above solution, the pressure relief assembly includes a pressure relief pipe fixedly installed on the top of the top cover, with a one-way valve fixedly installed at each end of the pressure relief pipe, and the two one-way valves having opposite conduction directions. Two heat dissipation mechanisms are installed on the outside of the pressure relief pipe.

[0011] As a further improvement to the above solution, the installation mechanism includes a fixed plate fixedly connected to the top of the threaded sleeve, a hexagonal nut threadedly connected to the bottom of the threaded sleeve, a sealing sleeve fixedly connected to the bottom of the hexagonal nut, a hexagonal nut fixedly connected to the bottom of the fixed plate, and the hexagonal nut slidably connected to the inside of the limiting sleeve.

[0012] As a further improvement to the above solution, the turntable is rotatably mounted on the top of the fixed disk via a guide rail, and the sealing disk is slidably connected to the inside of the sealing sleeve.

[0013] As a further improvement to the above solution, the outer side of the positioning block is provided with an installation groove and a limiting groove, the side of the movable block near the positioning block is fixedly connected to a limiting rod, the limiting rod is slidably connected in the limiting groove, and one end of the spring is fixedly connected to the inner wall of the end of the installation groove away from the movable block.

[0014] As a further improvement to the above solution, an inclined groove is provided on the outer side of the fixed base, and the guide rod is slidably installed in the inclined groove.

[0015] As a further improvement to the above solution, the heat dissipation mechanism includes a heat dissipation base fixedly installed on the outside of the pressure relief pipe, a venturi tube fixedly connected inside the heat dissipation base, a mounting shaft rotatably connected inside the heat dissipation base, a wheel blade fixedly connected to the bottom of the mounting shaft, the wheel blade penetrating into the interior of the venturi tube, and a fan blade fixedly connected to the top of the mounting shaft.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] During assembly, the threaded sleeve is pre-installed on the top cover via the installation mechanism. When the conductive rod inside the sleeve penetrates into the movable seat, the fixed seat inclined groove drives the positioning block to open, achieving boltless installation. The rotating turntable causes the movable sleeve to move the movable base upward, simultaneously completing the clamping of the conductive rod and the pre-tightening of the seal. This replaces the traditional flange bolt pre-tightening process, improving installation efficiency. During operation, the sliding fit between the movable sleeve and the movable base can compensate for the dynamic displacement of the sealing interface caused by oil temperature fluctuations, suppressing plastic deformation and aging failure of the seal, and reducing the leakage failure rate.

[0018] A pressure balancing component is integrated on the top of the cover. The bidirectional flow control of the pressure relief pipe is achieved through parallel-installed forward and reverse one-way valve groups. When the air pressure inside the housing exceeds the threshold, the insulating oil enters the pressure relief circuit through the heat dissipation guide channel, drives the turbine impeller to rotate, and drives the forced cooling fan to run through the coaxial transmission mechanism. At the same time, the pressure is released, and the heat exchange efficiency is improved by utilizing the fluid self-driving effect. The thermal expansion effect is suppressed by reducing the temperature of the circulating oil. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the top cover of the present invention;

[0022] Figure 3 This is a schematic diagram of the bottom structure of the top cover of the present invention;

[0023] Figure 4 This is a schematic cross-sectional view of the top cover of the present invention;

[0024] Figure 5 This is a schematic diagram of the top structure of the top cover of the present invention;

[0025] Figure 6 This is a schematic diagram of the structure of the connection component of the present invention;

[0026] Figure 7 This is a schematic diagram of the internal structure of the sealing sleeve of the present invention;

[0027] Figure 8 This is a schematic diagram of the internal structure of the threaded sleeve of the present invention;

[0028] Figure 9 This is a schematic diagram of the internal structure of the movable sleeve of the present invention;

[0029] Figure 10 This is a schematic diagram of the structure of the movable sleeve of the present invention;

[0030] Figure 11 This is a schematic diagram of the structure of the movable seat of the present invention;

[0031] Figure 12 This is a schematic diagram of the structure of the movable seat of the present invention;

[0032] Figure 13 This is a schematic diagram of the internal structure of the heat sink of the present invention.

[0033] In the diagram: 1. Outer shell; 2. Top cover; 3. Connecting assembly; 31. Limiting sleeve; 32. Mounting mechanism; 321. Sealing sleeve; 322. Hex nut; 323. Fixed plate; 324. Hex nut; 33. Threaded sleeve; 34. Sealing mechanism; 341. Movable sleeve; 342. Turntable; 343. Sealing plate; 35. Positioning mechanism; 351. Movable seat; 352. Fixed seat; 353. Movable seat; 354. Positioning block; 355. Guide rod; 356. Spring; 357. Limiting rod; 4. Pressure relief valve; 5. Pressure relief assembly; 51. Pressure relief pipe; 52. Heat dissipation mechanism; 521. Heat dissipation base; 522. Fan blade; 523. Wheel blade; 524. Venturi tube; 525. Mounting shaft; 53. Check valve. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0035] Please see Figures 1 to 13 As shown, the present invention provides an embodiment:

[0036] A mechanical leak-proof sealing structure for a transformer includes a housing 1 and a top cover 2. The top of the top cover 2 is provided with a connecting assembly 3, a pressure relief valve 4, and a pressure relief assembly 5. The pressure relief valve 4 is fixedly installed on the top of the top cover 2. The connecting assembly 3 includes a limiting sleeve 31, an installation mechanism 32, a threaded sleeve 33, a sealing mechanism 34, and a positioning mechanism 35. The threaded sleeve 33 is installed inside the top cover 2 through the installation mechanism 32, and the limiting sleeve 31 is fixedly connected to the top of the top cover 2.

[0037] The sealing mechanism 34 includes a movable sleeve 341 and a turntable 342. The movable sleeve 341 and the turntable 342 are threaded together. A sealing disc 343 is fixedly connected to the bottom of the movable sleeve 341, and a sealing gasket is fixedly connected to the top of the sealing disc 343.

[0038] The positioning mechanism 35 includes a movable seat 351 slidably connected inside the movable sleeve 341. Four movable blocks 353 are slidably connected inside the movable seat 351. A guide rod 355 is fixedly connected inside the movable block 353. A fixed seat 352 is slidably connected between the guide rod 355 and the movable block 353. The fixed seat 352 passes through the movable sleeve 341 and is fixedly connected to the inner wall of the threaded sleeve 33. A positioning block 354 is fixedly connected to the outer side of the movable block 353 by a spring 356.

[0039] The outer side of the positioning block 354 is provided with an installation groove and a limiting groove. The side of the movable block 353 near the positioning block 354 is fixedly connected to a limiting rod 357. The limiting rod 357 is slidably connected in the limiting groove. One end of the spring 356 is fixedly connected to the inner wall of the end of the installation groove away from the movable block 353. The outer side of the fixed seat 352 is provided with an inclined groove. The guide rod 355 is slidably installed in the inclined groove.

[0040] In practical applications, the embodiments of the present invention, such as Figure 3 , Figure 8 , Figure 9 and Figure 11 As shown, the threaded sleeve 33 is first fixed to the top of the outer shell 1 by the installation mechanism 32. Then, the conductive rod assembly inside the sleeve passes through the movable sleeve 341 and the movable seat 351 in sequence. During the process of the conductive rod assembly passing through the movable seat 351, its bottom end first contacts the positioning block 354, which in turn pushes the positioning block 354 and the movable block 353 to move. Since the movable block 353 forms a sliding pair with the inclined groove on the fixed seat 352 through the guide rod 355, under the thrust of the conductive rod assembly, the movable block 353 and the positioning block 354 move radially to the outside of the movable seat 351 to open the internal channel. At this time, the conductive rod assembly can continue to move downward to complete the penetration action of the movable seat 351 and the sealing plate 343.

[0041] After the sleeve moves the conductive rod assembly to the preset position, such as Figures 6 to 11As shown, the rotating turntable 342 drives the movable sleeve 341 to move upward through the threaded transmission pair between the turntable 342 and the movable sleeve 341. The upward movement of the movable sleeve 341 drives the sealing disc 343 to move upward synchronously, and pushes the top sleeve, thereby displacing the conductive rod assembly. During the upward movement of the conductive rod assembly, the contact surface with the positioning block 354 drives the movable block 353 to move upward synchronously, so that the positioning block 354 and the conductive rod assembly form a clamping and fastening state. At the same time, the upward movement of the sealing disc 343 drives the movable seat 351 to move upward through the sealing gasket, thereby limiting the movement of the movable block 341. At the bottom of 53, the axial position of the conductive rod assembly is clamped and initially sealed by the positioning block 354. The sealing disc 343 forms a secondary sealing structure with the contact surface of the sealing gasket, the movable seat 351, and the threaded sleeve 33. Together with the sealing sleeve 321, it forms a multi-seal system. When the internal medium pressure rises abnormally, the pressure load will push the movable seat 351 to generate axial displacement in the movable sleeve 341, causing the pressure on the contact surface between the positioning block 354 and the conductive rod assembly to increase adaptively, forming dynamic sealing compensation, effectively reducing the leakage failure rate caused by plastic deformation and aging failure of the sealing components.

[0042] like Figure 2 , Figure 3 and Figure 13 As shown, the pressure relief assembly 5 includes a pressure relief pipe 51 fixedly installed on the top of the top cover 2. A one-way valve 53 is fixedly installed at each end of the pressure relief pipe 51, and the two one-way valves 53 have opposite conduction directions. Two heat dissipation mechanisms 52 are installed on the outside of the pressure relief pipe 51. The heat dissipation mechanism 52 includes a heat dissipation base 521 fixedly installed on the outside of the pressure relief pipe 51. A venturi tube 524 is fixedly connected inside the heat dissipation base 521. A mounting shaft 525 is rotatably connected inside the heat dissipation base 521. A wheel blade 523 is fixedly connected to the bottom of the mounting shaft 525. The wheel blade 523 penetrates into the inside of the venturi tube 524. A fan blade 522 is fixedly connected to the top of the mounting shaft 525.

[0043] In practical applications, when the internal pressure of the transformer rises above a set threshold due to oil temperature fluctuations, the high-pressure insulating oil inside the casing pushes the outward-facing one-way valve 53 to open. The oil then enters the heat dissipation mechanism 52 through the pressure relief pipe 51. As the oil flows through the Venturi tube 524, the flow velocity increases due to the channel's contraction characteristics. This causes the impeller 523 to drive the mounting shaft 525 to rotate, simultaneously driving the fan blades 522 to rotate at high speed. This enhances the heat exchange between the heat sink 521 and the outside environment, allowing the high-temperature insulating oil to cool down rapidly and reducing the continuous impact of thermal expansion on the internal pressure. Once the pressure is released to a safe range, the outward-facing one-way valve 53 closes. If negative pressure occurs in the casing, the inward-facing one-way valve 53 automatically opens to balance the pressure and prevent external moisture from entering. Combined with the mechanical seal structure of the connecting component 3, this further reduces the risk of leakage.

[0044] like Figures 6 to 8As shown, the installation mechanism 32 includes a fixed plate 323 fixedly connected to the top of the threaded sleeve 33, a hexagonal nut 322 threadedly connected to the bottom of the threaded sleeve 33, a sealing sleeve 321 fixedly connected to the bottom of the hexagonal nut 322, a hexagonal nut 324 fixedly connected to the bottom of the fixed plate 323, the hexagonal nut 324 slidably connected to the inside of the limiting sleeve 31, a turntable 342 rotatably mounted on the top of the fixed plate 323 via a guide rail, and the sealing plate 343 slidably connected to the inside of the sealing sleeve 321.

[0045] In practical application, the hexagonal nut 324 is slid into the inner wall of the limiting sleeve 31, and its hexagonal structure is used to achieve circumferential positioning. The hexagonal nut 322 is rotated to make it tightly fit with the bottom thread pair of the threaded sleeve 33. The fixed plate 323 is pressed against the end face of the limiting sleeve 31 by the axial preload to form an initial sealing interface. When the turntable 342 rotates along the top guide rail of the fixed plate 323, the movable sleeve 341 is driven to move axially through the threaded transmission. The sealing plate 343 moves upward synchronously and forms a further seal with the sealing sleeve 321.

[0046] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0047] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mechanical leak-proof sealing structure for a transformer, comprising a housing (1) and a top cover (2), characterized in that: The top of the top cover (2) is provided with a connecting assembly (3), a pressure relief valve (4) and a pressure relief assembly (5). The pressure relief valve (4) is fixedly installed on the top of the top cover (2). The connecting assembly (3) includes a limiting sleeve (31), an installation mechanism (32), a threaded sleeve (33), a sealing mechanism (34) and a positioning mechanism (35). The threaded sleeve (33) is installed inside the top cover (2) through the installation mechanism (32). The limiting sleeve (31) is fixedly connected to the top of the top cover (2). The sealing mechanism (34) includes a movable sleeve (341) and a turntable (342). The movable sleeve (341) and the turntable (342) are threaded together. A sealing disc (343) is fixedly connected to the bottom of the movable sleeve (341), and a sealing gasket is fixedly connected to the top of the sealing disc (343). The positioning mechanism (35) includes a movable seat (351) slidably connected inside the movable sleeve (341). Four movable blocks (353) are slidably connected inside the movable seat (351). A guide rod (355) is fixedly connected inside the movable block (353). A fixed seat (352) is slidably connected between the guide rod (355) and the movable block (353). The fixed seat (352) passes through the movable sleeve (341) and is fixedly connected to the inner wall of the threaded sleeve (33). A positioning block (354) is fixedly connected to the outer side of the movable block (353) by a spring (356).

2. The mechanical anti-leakage sealing structure for a transformer according to claim 1, characterized in that: The pressure relief assembly (5) includes a pressure relief pipe (51) fixedly installed on the top of the top cover (2). A one-way valve (53) is fixedly installed at each end of the pressure relief pipe (51), and the two one-way valves (53) are in opposite directions. Two heat dissipation mechanisms (52) are installed on the outside of the pressure relief pipe (51).

3. The mechanical anti-leakage sealing structure for a transformer according to claim 2, characterized in that: The installation mechanism (32) includes a fixed plate (323) fixedly connected to the top of the threaded sleeve (33), a hexagonal nut (322) threadedly connected to the bottom of the threaded sleeve (33), a sealing sleeve (321) fixedly connected to the bottom of the hexagonal nut (322), and a hexagonal nut (324) fixedly connected to the bottom of the fixed plate (323). The hexagonal nut (324) is slidably connected to the inside of the limiting sleeve (31).

4. The mechanical anti-leakage sealing structure for a transformer according to claim 2, characterized in that: The turntable (342) is rotatably mounted on the top of the fixed plate (323) via a guide rail, and the sealing plate (343) is slidably connected to the inside of the sealing sleeve (321).

5. A mechanical leak-proof sealing structure for a transformer according to claim 2, characterized in that: The positioning block (354) has an installation groove and a limiting groove on its outer side. The movable block (353) is fixedly connected to a limiting rod (357) on the side near the positioning block (354). The limiting rod (357) is slidably connected in the limiting groove. One end of the spring (356) is fixedly connected to the inner wall of the end of the installation groove away from the movable block (353).

6. The mechanical anti-leakage sealing structure for a transformer according to claim 2, characterized in that: The outer side of the fixed base (352) is provided with an inclined groove, and the guide rod (355) is slidably installed in the inclined groove.

7. A mechanical leak-proof sealing structure for a transformer according to claim 3, characterized in that: The heat dissipation mechanism (52) includes a heat dissipation base (521) fixedly installed on the outside of the pressure relief pipe (51). A venturi tube (524) is fixedly connected inside the heat dissipation base (521). A mounting shaft (525) is rotatably connected inside the heat dissipation base (521). A wheel blade (523) is fixedly connected to the bottom of the mounting shaft (525). The wheel blade (523) penetrates into the interior of the venturi tube (524). A fan blade (522) is fixedly connected to the top of the mounting shaft (525).

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