A kind of add-on explosion-proof expander for transformer
By designing and installing an explosion-proof expander, the problem of oil tank leakage caused by increased internal pressure in the transformer was solved, thus achieving both safety and convenient maintenance of the transformer.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 江苏威科变压器有限公司
- Filing Date
- 2025-08-27
- Publication Date
- 2026-07-24
AI Technical Summary
Internal faults in transformers can lead to increased internal pressure, which can cause oil tank leaks and pose a safety hazard.
Design an add-on explosion-proof expander, including a connecting pipe, an expander module and an installation module. The connecting pipe is connected to the oil drain port of the transformer tank. The expander module includes an expansion seat, an expansion pipe and a rupture disc. The metal bellows and the rupture disc release pressure when the pressure exceeds the limit. An exhaust valve is provided to facilitate gas discharge.
It effectively adjusts the space of the transformer oil tank, prevents oil tank leakage, reduces damage to the transformer, and is convenient to install and maintain.
Smart Images
Figure CN224554122U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of explosion-proof transformer technology, and in particular to an explosion-proof expansion joint for transformers. Background Technology
[0002] An expander is an elastic component installed on a transformer to compensate for the volume change of the insulating oil inside the transformer due to temperature variations. It isolates the insulating oil from the external environment, preventing the insulating oil from getting damp, aging, or deteriorating, and ensuring the safety of the product's operation.
[0003] Currently, a dangerous phenomenon exists during transformer operation: due to potential internal faults or other abnormalities, a large amount of gas may be generated inside the transformer, causing the internal pressure to increase continuously (even rapidly). When the pressure exceeds the transformer tank's own capacity, it can lead to transformer leakage, posing a serious safety hazard to the normal operation of the power system and even threatening personal safety. Utility Model Content
[0004] The technical problem to be solved by this utility model is to provide an explosion-proof expansion device for transformers, which can solve the problem that the usable space of transformer oil in the general transformer oil tank is difficult to dynamically adjust with temperature and pressure, which easily leads to oil tank leakage.
[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows: an explosion-proof expansion device for transformers, which is installed and connected to the oil drain port of the transformer tank; its innovation lies in that it includes a connecting pipe, an expansion device module and an installation module. One end of the connecting pipe is connected to the drain port of the transformer oil tank, and the connecting pipe is a flexible hose; the other end of the connecting pipe is connected to the expander module. The expander module is connected to the outer wall of the transformer tank via an installation module; the expander module includes an expansion seat, an expansion tube, and a rupture disc; the expansion seat has a cylindrical tubular structure, one end of the expansion seat is threaded to one end of the connecting tube; the other end of the expansion seat is flanged to one end of the expansion tube. The expansion tube includes a lower flange, a metal bellows, an upper flange, and limiting rods; the lower flange is connected to the end of the expansion seat; several limiting rods are circumferentially locked onto the lower flange; the upper flange is movably nested on the limiting rods; One end of the metal bellows is fixedly connected to the lower flange and communicates with the connecting pipe through the expansion seat; the other end of the metal bellows is fixedly provided with a guide plate, and the edge of the guide plate is provided with a guide hole that cooperates with the limiting rod. The metal bellows can expand and move between the upper flange and the lower flange along the extension direction of the limiting rod. The rupture disc is disposed between the upper flange and the guide plate and is fixed by bolts; the rupture disc is recessed towards the other end of the metal bellows to form a concave arc surface; The installation module includes a C-shaped buckle, a pin head, a limiting pin, and a hinge shaft. The C-shaped buckle is installed on the outer wall of the transformer tank. The pin head is fixedly welded to the outer wall of the upper flange along the vertical direction. The pin head is embedded in the C-shaped buckle to achieve a limiting connection of the entire expander module on the outer wall of the transformer tank. A cavity for accommodating the limiting pin is provided near the bottom of the pin head, and a hinge hole is horizontally provided on the pin head located at the cavity position. The hinge shaft is positioned... The pin head extends from the hinge hole to the cavity containing the limiting pin. The limiting pin is located in the cavity on the pin head and is connected to the hinge shaft, rotating with the hinge shaft. The center of gravity of the limiting pin is located diagonally above the hinge shaft and biased towards the outside of the C-shaped buckle. The limiting pin rotates out of the cavity and is supported on the lower surface of the C-shaped buckle by its own weight. The bottom end of the limiting pin presses against the side wall of the cavity to limit the movement when the top end of the limiting pin rotates out of the cavity.
[0006] Furthermore, the rupture disc is equipped with an exhaust valve and pre-crack patterns.
[0007] Furthermore, the bursting pressure of the rupture disc is 0.2-0.25 MPa.
[0008] The advantages of this utility model are: 1) In this utility model, an expansion module is installed at the drain port of the transformer tank via a connecting pipe, which makes full use of the existing structure of the transformer. In addition, by installing an exhaust valve on the rupture disc, gas can be discharged when oil is injected into the transformer tank. The metal bellows extends or shortens with the change in the volume of insulating oil in the entire transformer tank. When a fault occurs in the transformer tank and gas is generated or the volume of insulating oil continues to increase, the rupture disc changes from concave to convex. When the pressure exceeds the limit, it will burst open to release the internal pressure and reduce damage to the transformer. The expansion module is directly installed on the outside of the transformer tank by plugging it in. After the connecting pipe is installed, the entire expansion device is easy to install, disassemble, and maintain. Attached Figure Description
[0009] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.
[0010] Figure 1 This is a schematic diagram of the structure of an explosion-proof expansion joint for a transformer according to the present invention.
[0011] Figure 2 This is a partial structural diagram of an explosion-proof expansion joint for a transformer according to the present invention. Detailed Implementation
[0012] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0013] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0014] like Figure 1 Figure 2 The diagram shows an explosion-proof expansion device for transformers, which is installed and connected to the drain port of the transformer oil tank; it includes a connecting pipe 1, an expansion module 2, and an installation module 3.
[0015] One end of the connecting pipe 1 is connected to the drain port of the transformer oil tank. The connecting pipe 1 is a flexible hose. The other end of the connecting pipe 1 is connected to the expander module 2.
[0016] The expander module 2 is connected to the outer wall of the transformer tank via the mounting module 3; the expander module 2 includes an expansion seat 21, an expansion tube 22 and a rupture disc 23; the expansion seat 21 has a cylindrical tubular structure, one end of the expansion seat 21 is connected to one end of the connecting tube 1 by a thread; the other end of the expansion seat 21 is connected to one end of the expansion tube by a flange.
[0017] The expansion tube 22 includes a lower flange 221, a metal bellows 222, an upper flange 223, and limiting rods 224; the lower flange 221 is connected to the end of the expansion seat 21; a number of limiting rods 224 are circumferentially locked on the lower flange 221; the upper flange 223 is movably nested on the limiting rods 224.
[0018] One end of the metal bellows 222 is fixedly connected to the lower flange 221 and is connected to the connecting pipe 1 through the expansion seat 21; the other end of the metal bellows 222 is fixedly provided with a guide plate 225, and the edge of the guide plate 225 is provided with a guide hole that cooperates with the limiting rod 224. The metal bellows 222 can expand and move between the upper flange 223 and the lower flange 221 along the extension direction of the limiting rod 224.
[0019] The rupture disc 23 is disposed between the upper flange 223 and the guide plate 225 and is fixed by bolts; the rupture disc 23 is recessed towards the other end of the metal bellows 222 to form a concave arc surface.
[0020] The mounting module 3 includes a C-shaped buckle 31, a pin head 32, a limiting pin 33, and a hinge shaft 34. The C-shaped buckle 31 is mounted on the outer wall of the transformer tank. The pin head 32 is fixedly welded to the outer wall of the upper flange 223 along the vertical direction. The pin head 32 is embedded in the C-shaped buckle 31 to achieve the limiting connection of the entire expander module 2 on the outer wall of the transformer tank. A cavity for accommodating the limiting pin 33 is provided near the bottom of the pin head 32, and a hinge hole is horizontally provided on the pin head 32 located at the cavity position. The hinge shaft 34 is disposed in the hinge hole. One end of the hinge shaft 34 extends from the pin head 32 into the cavity that accommodates the limiting pin 33; the limiting pin 33 is disposed in the cavity on the pin head 32 and connected to the hinge shaft 34, rotating with the hinge shaft 34; the center of gravity of the limiting pin 33 is located obliquely above the hinge shaft 34 and biased towards the outside of the C-shaped buckle 31; by the weight of the limiting pin 32, the end of the limiting pin 33 is rotated out of the cavity and supported on the lower surface of the C-shaped buckle 31, and the bottom end of the limiting pin 33 presses against the side wall of the cavity for limiting when the top end of the limiting pin 33 rotates out of the cavity.
[0021] The rupture disc 23 is equipped with an exhaust valve 231 and pre-crack patterns.
[0022] The burst pressure of the rupture disc 23 is 0.2-0.25 MPa.
[0023] The working principle of this utility model is as follows: An expansion module is installed at the drain port of the transformer tank via a connecting pipe, making full use of the existing transformer structure. Furthermore, by installing an exhaust valve on the rupture disc, gas can be released during oil filling of the transformer tank. The metal bellows extends or shortens with the change in the volume of insulating oil within the entire transformer tank. When a fault occurs in the transformer tank, generating gas or causing a continuous increase in the volume of insulating oil, the rupture disc changes from concave to convex. When the pressure exceeds the limit, it bursts open, releasing the internal pressure and reducing damage to the transformer. The expansion module is directly installed on the outside of the transformer tank via a plug-in connection. After the connecting pipe is installed, the entire expansion module is easy to install, disassemble, and maintain.
[0024] Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of this utility model as claimed.
Claims
1. A transformer-mounted explosion-proof expander, wherein the expander is installed and connected to the drain port of the transformer tank; characterized in that: Includes connecting pipes, expander modules, and mounting modules; One end of the connecting pipe is connected to the drain port of the transformer oil tank, and the connecting pipe is a flexible hose; the other end of the connecting pipe is connected to the expander module. The expander module is connected to the outer wall of the transformer tank via an installation module; the expander module includes an expansion seat, an expansion tube, and a rupture disc; the expansion seat has a cylindrical tubular structure, one end of the expansion seat is threaded to one end of the connecting tube; the other end of the expansion seat is flanged to one end of the expansion tube. The expansion tube includes a lower flange, a metal bellows, an upper flange, and limiting rods; the lower flange is connected to the end of the expansion seat; several limiting rods are circumferentially locked onto the lower flange; the upper flange is movably nested on the limiting rods; One end of the metal bellows is fixedly connected to the lower flange and communicates with the connecting pipe through the expansion seat; the other end of the metal bellows is fixedly provided with a guide plate, and the edge of the guide plate is provided with a guide hole that cooperates with the limiting rod. The metal bellows can expand and move between the upper flange and the lower flange along the extension direction of the limiting rod. The rupture disc is disposed between the upper flange and the guide plate and is fixed by bolts; the rupture disc is recessed towards the other end of the metal bellows to form a concave arc surface; The installation module includes a C-shaped buckle, a pin head, a limiting pin, and a hinge shaft. The C-shaped buckle is installed on the outer wall of the transformer tank. The pin head is fixedly welded to the outer wall of the upper flange along the vertical direction. The pin head is embedded in the C-shaped buckle to achieve a limiting connection of the entire expander module on the outer wall of the transformer tank. A cavity for accommodating the limiting pin is provided near the bottom of the pin head, and a hinge hole is horizontally provided on the pin head located at the cavity position. The hinge shaft is positioned... The pin head extends from the hinge hole to the cavity containing the limiting pin. The limiting pin is located in the cavity on the pin head and is connected to the hinge shaft, rotating with the hinge shaft. The center of gravity of the limiting pin is located diagonally above the hinge shaft and biased towards the outside of the C-shaped buckle. The limiting pin rotates out of the cavity and is supported on the lower surface of the C-shaped buckle by its own weight. The bottom end of the limiting pin presses against the side wall of the cavity to limit the movement when the top end of the limiting pin rotates out of the cavity.
2. The explosion-proof expansion joint for a transformer according to claim 1, characterized in that: The rupture disc is equipped with an exhaust valve and pre-crack patterns.
3. The explosion-proof expansion joint for a transformer according to claim 1, characterized in that: The bursting pressure of the rupture disc is 0.2-0.25 MPa.