Tooling and method for replacing a transformer pressure relief valve

Abstract

The application discloses a tool and method for replacing a transformer pressure relief valve, which comprises an oil storage box with an open top end, a sealed side surface and a through hole, the through hole is used for allowing the pressure relief valve and a flange mounting seat connected with the pressure relief valve to pass through and be installed in the oil storage box, and the outer wall of the sealed side surface is provided with a sealing element surrounding the through hole; two chucks are symmetrically split together to form a split type fixing member through a first set of fasteners, and are used for abutting between a flange plate of the flange mounting seat and an inner wall of the sealed side surface, and the split type fixing member is provided with a second set of fasteners which can be disassembled and pressed against the inner wall of the sealed side surface, and is used for fixing the oil storage box on the shell of the oil tank. The application can replace the pressure relief valve on site without draining the transformer oil tank, and the replacement can be performed without returning to the factory, thereby being efficient and convenient, and reducing the transportation cost and the vacuum oil injection cost of returning to the factory.

Description

Technical Field

[0001] This invention relates to the field of transformer pressure relief valve replacement technology, and more specifically, to a tooling for replacing transformer pressure relief valves. Furthermore, this invention also relates to a method for replacing a transformer pressure relief valve using the aforementioned tooling. Background Technology

[0002] The transformer is submerged in an oil tank, which serves to cool and isolate the transformer, ensuring its safe and stable operation. When a fault occurs in the oil tank, the oil inside decomposes and vaporizes, producing a large amount of gas. This causes a rapid increase in pressure within the tank. If this pressure is not released in time, it can lead to tank deformation or even rupture. Therefore, a pressure relief valve must be installed on the tank casing to ensure that the tank remains within a safe pressure range and to prevent damage to the transformer.

[0003] In the prior art, the outer shell of the oil tank is provided with a flange mounting seat, the valve seat of the pressure relief valve is located on the flange mounting seat, and the spring at its end extends into the flange mounting seat, so that the flange mounting seat serves to connect the pressure relief valve and the tank body, realizing the detachable installation of the pressure relief valve, while ensuring the sealing of the connection.

[0004] However, if the pressure relief valve malfunctions or leaks oil and needs replacement, it cannot be directly disassembled and repaired. The transformer tank must be returned to the factory for draining, the pressure relief valve replaced, and finally, vacuum oil filling performed. Therefore, the existing pressure relief valve replacement is inefficient and extremely costly.

[0005] In summary, how to solve the problem of low replacement efficiency and extremely high replacement cost of existing transformer pressure relief valves is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a tooling for replacing a transformer pressure relief valve, which can replace the pressure relief valve without draining the transformer oil tank, thereby improving the replacement efficiency of the pressure relief valve and reducing the replacement cost of the pressure relief valve.

[0007] Another object of the present invention is to provide a method for replacing a transformer pressure relief valve using the above-described tooling for replacing a transformer pressure relief valve.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A tooling for replacing a transformer pressure relief valve, comprising:

[0010] An oil reservoir has an opening at its top. One side of the oil reservoir is a sealing surface with a through hole. The through hole is used for the pressure relief valve and its connected flange mounting seat to pass through and be installed in the oil reservoir. The outer wall of the sealing surface is provided with a sealing element around the through hole. The sealing element is used to tightly fit the outer shell of the oil tank.

[0011] Two chucks are symmetrically and detachably assembled together by a first set of fasteners to form a split-type fastener, which is used to abut against the flange of the flange mounting seat and the inner wall of the sealing surface. The split-type fastener is provided with a detachable second set of fasteners, which are pressed against the inner wall of the sealing surface to fix the oil storage box to the outer shell of the oil tank.

[0012] Preferably, an oil drain pipe is inserted into the bottom of the other side of the oil storage box, connecting the inside and outside of the oil storage box, and a switch valve is provided on the oil drain pipe.

[0013] Preferably, the outer wall of the sealing surface is provided with an annular boss coaxial with the through hole, and the inner diameter of the annular boss is the same as the diameter of the through hole. The sealing element is provided on the end face of the annular boss away from the oil storage box.

[0014] Preferably, the annular boss has an annular groove on the end face away from the oil storage box, and the sealing element is an O-ring seal with a portion embedded in the annular groove.

[0015] Preferably, the oil storage box has a notch at the top adjacent to the sealing surface, and the notch is L-shaped.

[0016] Preferably, the chuck includes a semi-circular disc and a semi-circular boss coaxially disposed on one end face of the disc;

[0017] The semi-circular annular disk is provided with a plurality of second mounting holes spaced apart around its axial direction. The second mounting holes are used for the second fastener in the second group of fasteners to pass through.

[0018] The semi-circular ring boss is provided with a plurality of insertion holes distributed perpendicular to its axial direction. Two semi-circular ring bosses are joined together and their insertion holes overlap to form a first mounting hole. The first mounting hole is used for the first fastener in the first group of fasteners to pass through.

[0019] Preferably, the outer periphery of the semi-circular annular boss is provided with a plurality of clearance grooves extending along its axial direction, and the plurality of clearance grooves correspond one-to-one with the plurality of second mounting holes.

[0020] A method for replacing a transformer pressure relief valve using the tooling described in any one of the above claims, for a transformer oil tank, the transformer oil tank including an oil tank, a flange mounting base, and a pressure relief valve, the flange mounting base being disposed on the outer shell of the oil tank, the valve seat of the pressure relief valve being disposed on the flange of the flange mounting base, and a spring at its end being inserted into the flange mounting base; the method for replacing the transformer pressure relief valve includes:

[0021] Align the through hole on the sealing surface with the pressure relief valve and the flange mounting seat, and install them into the interior of the oil reservoir;

[0022] The first set of fasteners on the split fastener is removed and divided into two chucks. Both chucks and the first set of fasteners are inserted into the oil storage box through the top opening of the oil storage box.

[0023] The two chucks are moved between the flange and the inner wall of the sealing surface, and then the two chucks are joined together using the first set of fasteners;

[0024] Insert the second set of fasteners into the inside of the oil storage box through the top opening of the oil storage box;

[0025] The second set of fasteners is passed through the split-type fixing member and pressed against the inner wall of the sealing surface until the sealing member is tightly attached to the outer shell of the oil tank, and the oil storage box is fixed to the outer shell of the oil tank;

[0026] Transformer oil is injected from the top opening of the oil conservator until the oil level in the oil conservator is equal to the oil level in the oil tank.

[0027] Remove the old pressure relief valve from the flange mount and remove it through the top opening of the oil reservoir;

[0028] The new pressure relief valve is moved in through the top opening of the oil reservoir and reassembled on the flange mounting base to complete the pressure relief valve replacement.

[0029] Remove the second set of fasteners to separate the outer casing of the oil storage box and the oil tank.

[0030] Preferably, the transformer oil tank further includes a valve cover over the pressure relief valve; the method for replacing the transformer pressure relief valve further includes:

[0031] Remove the valve cover before aligning the through-hole on the sealing surface with the pressure relief valve and the flange mount and inserting them into the oil reservoir.

[0032] Preferably, an oil drain pipe communicating with the inside and outside of the oil storage box is inserted into the bottom of the other side of the oil storage box, and a switch valve is provided on the oil drain pipe; the method for replacing the transformer pressure relief valve further includes:

[0033] Before removing the second set of fasteners, open the switch valve to drain the transformer oil from the oil reservoir.

[0034] The specific process for replacing a transformer pressure relief valve using the tooling provided by this invention is as follows:

[0035] Step 1: Position the sealing surface of the oil conservator towards the side of the transformer tank with the pressure relief valve, align the through hole on the sealing surface with the pressure relief valve, and move the oil conservator toward the pressure relief valve so that the pressure relief valve and its connected flange mounting seat are inserted into the interior of the oil conservator through the through hole.

[0036] Step 2: Remove the first set of fasteners on the split fastener and separate them into two chucks. Insert the two independent chucks and the first set of fasteners into the oil reservoir through the top opening of the oil reservoir.

[0037] Step 3: Move both chucks between the flange and the inner wall of the sealing surface, and then use the first set of fasteners to join the two chucks together.

[0038] Step 4: Insert the second set of fasteners into the inside of the oil reservoir through the top opening of the oil reservoir.

[0039] Step 5: Pass the second set of fasteners through the split fastener and press it against the inner wall of the sealing cover until the seal fits tightly against the outer shell of the oil tank, and the oil storage box is fixed to the outer shell of the oil tank.

[0040] Step 6: Pour transformer oil into the oil conservator through the top opening until the oil level in the conservator is equal to the oil level in the transformer tank. At this point, the oil level in the conservator and the transformer tank are equal.

[0041] Step 7: Remove the old pressure relief valve from the flange mounting base and move it out through the top opening of the oil reservoir. It should be noted that since the oil reservoir and the transformer oil tank have the same liquid level, the hydraulic pressure of the oil reservoir and the transformer oil tank is also equal. The pressure difference disappears, no siphon phenomenon occurs, and the oil in the oil reservoir and the transformer does not flow. Therefore, the oil in the transformer oil tank will not leak out.

[0042] Step 8: Move the new pressure relief valve through the top opening of the oil reservoir and reassemble it on the flange mounting base to complete the pressure relief valve replacement.

[0043] Step nine: Remove the second set of fasteners, and the oil reservoir can be removed from the outer shell of the oil tank.

[0044] In summary, the tooling for replacing transformer pressure relief valves provided by this invention enables on-site replacement of pressure relief valves without draining the transformer oil tank, eliminating the need for return to the factory. This is highly efficient and convenient, and reduces the costs of returning the valves to the factory and vacuum oil injection. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0046] Figure 1 This is a schematic diagram of the assembly of the tooling for replacing the transformer pressure relief valve provided by the present invention with the transformer oil tank.

[0047] Figure 2 for Figure 1 Partial sectional view;

[0048] Figure 3 This is a schematic diagram of the structure of the oil storage box provided by the present invention;

[0049] Figure 4 This is a schematic diagram of the structure of the split-type fastener provided by the present invention;

[0050] Figure 5 This is a schematic diagram of the assembly of the transformer oil tank and the flange mounting base in the prior art;

[0051] Figure 6 This is a schematic diagram of the structure of a pressure relief valve in a transformer oil tank in the prior art;

[0052] Figure 7 This is a schematic diagram of the valve cover structure of a transformer oil tank in the prior art.

[0053] Figure label:

[0054] 1-Oil reservoir; 2-Separate fastener; 3-Oil tank; 4-Pressure relief valve; 5-Flange mounting base; 6-Valve cover;

[0055] 11-Through hole; 12-Opening; 13-Seal; 14-Annular boss; 15-Oil drain pipe; 16-Switch valve; 17-Notch;

[0056] 21-Chuck; 22-First set of fasteners; 23-Second set of fasteners; 211-Semi-circular ring disc; 212-Semi-circular ring boss;

[0057] 41-Valve seat; 42-Spring;

[0058] 51-Flange; 52-Leg. Detailed Implementation

[0059] 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 scope of protection of the present invention.

[0060] The core of this invention is to provide a tooling for replacing transformer pressure relief valves. This tooling can replace the pressure relief valves without draining the transformer oil tank, thereby improving the replacement efficiency of the pressure relief valves and saving replacement costs.

[0061] Another core aspect of this invention is to provide a method for replacing a transformer pressure relief valve using the aforementioned tooling for replacing a transformer pressure relief valve.

[0062] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0063] Please refer to Figure 1 and Figure 2 The present invention provides a tooling for replacing a transformer pressure relief valve, including an oil reservoir 1 and two chucks 21.

[0064] The top of the oil storage box 1 is set as an opening 12, and one side of the oil storage box 1 is a sealing surface with a through hole 11. The through hole 11 is used for the pressure relief valve 4 and its connected flange mounting seat 5 to pass through and be installed in the oil storage box 1. The outer wall of the sealing surface is provided with a sealing element 13 around the through hole 11. The sealing element 13 is used to tightly fit the outer shell of the oil tank 3.

[0065] Two chucks 21 are symmetrically assembled together by a first set of fasteners 22 to form a split fastener 2, which is used to abut against the flange 51 of the flange mounting seat 5 and the inner wall of the sealing surface. The split fastener 2 is provided with a second set of fasteners 23 that can be disassembled and pressed against the inner wall of the sealing surface to fix the oil storage box 1 to the outer shell of the oil tank 3.

[0066] It should be noted that this tooling is used to remove the pressure relief valve 4 on the transformer oil tank. In existing technology, such as... Figure 2 , Figure 5 and Figure 6As shown, the transformer oil tank includes an oil tank 3, a flange mounting seat 5, and a pressure relief valve 4. The seat 52 of the flange mounting seat 5 is located on the outer shell of the oil tank 3. The valve seat 41 of the pressure relief valve 4 is located on the flange 51 of the flange mounting seat 5, and the spring 42 at its end passes through the flange 51 and is inserted into the seat 52.

[0067] Specifically, the top of the oil reservoir 1 is provided with an opening 12. This opening 12 allows the split-type fixing component 2 to be moved into the oil reservoir 1 in a split state, and provides an operating port for the operator to tighten the first set of fasteners 22 and the second set of fasteners 23. One side of the oil reservoir 1 is provided with a through hole 11. The diameter of this through hole 11 is larger than the maximum outer diameter of the valve seat 41 of the pressure relief valve 4 and the maximum outer diameter of the flange mounting seat 5, so as to ensure that the pressure relief valve 4 and the flange mounting seat 5 are installed into the interior of the oil reservoir 1 through the through hole 11. The side of the oil reservoir 1 with the through hole 11 is the sealing surface. This sealing surface needs to be in sealed contact with the outer shell of the oil tank 3 to avoid oil leakage caused by gaps between the oil reservoir 1 and the outer shell of the oil tank 3. Specifically, the sealing method is to provide a sealing element 13 arranged around the through hole 11 on the outer wall of the sealing surface. Preferably, the sealing element 13 is an O-ring. Thus, the sealing element 13 is tightly attached to the outer shell of the oil tank 3, so that the oil reservoir 1 and the outer shell of the oil tank 3 can be sealed and installed.

[0068] Additionally, a fastener is needed to secure the oil reservoir 1 to the outer shell of the oil tank 3. However, since the oil reservoir 1 only has an opening 12 at its top and its internal space is limited, the size and structure of the fastener are subject to stringent requirements. To facilitate the assembly of the split-type fastener 2, this invention provides a split-type fastener 2 consisting of two chucks 21. The two chucks are symmetrically and detachably joined together by a first set of fasteners 22, enabling the split-type fastener 2 to be detachable and thus better suited for installation in confined spaces. The first set of fasteners 22 consists of several bolts. The two chucks 21 are symmetrically joined together by the bolts, which not only makes it easier to assemble and disassemble the split-type fastener 2, but also allows adjustment of the relative distance between the two chucks 21 by adjusting the tightening of the bolts, thereby adjusting the size of the split-type fastener 2.

[0069] The present invention also employs a second set of fasteners 23 to seal and press the oil storage box 1 onto the outer shell of the oil tank 3. The second set of fasteners 23 passes through the split-type fixing member 2 and presses against the inner wall of the sealing surface, so as to tightly fit the sealing member 13 on the outer wall of the sealing surface against the outer shell of the oil tank 3. Furthermore, the reaction force of the flange 51 of the flange mounting seat 5 is used to fix the oil storage box 1 onto the outer shell of the oil tank 3. Preferably, the second set of fasteners 23 also consists of several bolts, which not only facilitates the disassembly and assembly of the split-type fixing member 2, but also allows adjustment of the tightness between the oil storage box 1 and the oil tank 3 by adjusting the tightening of the bolts.

[0070] In summary, in the aforementioned tooling for replacing the transformer pressure relief valve, the oil reservoir 1 can be fixed to the outer shell of the oil tank 3 via a split-type fixing component 2, and the pressure relief valve 4 and flange mounting seat 5 can be installed through the through hole 11. This allows transformer oil to be injected into the oil reservoir 1 through the top opening 12 before removing the pressure relief valve 4, until the oil level in the oil reservoir 1 equals the oil level in the oil tank 3. At this point, the oil reservoir 1 and the transformer oil tank have the same liquid level. Then, the pressure relief valve 4 can be removed. After removal, even though the oil reservoir 1 and the oil tank 3 are connected through the through hole 11, because the oil reservoir 1 and the transformer oil tank have the same liquid level, the hydraulic pressure in the oil reservoir 1 and the transformer oil tank is equal, the pressure difference disappears, and no siphon phenomenon occurs. The oil reservoir 1 and the oil in the transformer do not flow, and the oil in the transformer oil tank will not leak. Therefore, this tooling allows for on-site replacement of the pressure relief valve 4 without draining the transformer oil tank, eliminating the need for return to the factory. This is highly efficient and convenient, reducing return transportation costs and vacuum oil injection costs.

[0071] Based on the above embodiments, please refer to Figure 2 An oil drain pipe 15 connecting the inside and outside of the oil storage box 1 is inserted into the bottom of the other side of the oil storage box 1, and a switch valve 16 is provided on the oil drain pipe 15.

[0072] Specifically, an oil drain port is provided on the side of the oil storage box 1 opposite to its sealing surface. One end of the oil drain pipe 15 is inserted into the interior of the oil storage box 1 through the drain port, and the other end is located outside the oil storage box 1, so as to connect the inside and outside of the oil storage box 1 to realize the drainage of the oil storage box 1. The oil drain port is located at the bottom of the oil storage box 1, and the oil in the oil storage box 1 can be drained in time by the gravity of the oil itself. In addition, a switch valve 16 is provided on the section of the oil drain pipe 15 outside the oil storage box 1. The switch valve 16 is used to control the opening and closing of the oil drain pipe 15 to facilitate the control of the drainage of the oil storage box 1. The switch valve 16 can be a manual valve or an electronic valve. The type is not unique. It can be adapted according to specific needs, as long as it can control the opening and closing of the oil drain pipe 15.

[0073] Therefore, before removing the second set of fasteners 23, that is, before separating the oil reservoir 1 from the outer shell of the oil tank 3, the switch valve 16 can be opened to drain the oil from the oil reservoir 1 before removing the second set of fasteners 23, thus removing the oil reservoir 1 from the outer shell of the oil tank 3. This prevents the oil in the oil reservoir 1 from leaking out, enabling oil reuse and effectively avoiding oil waste that would increase replacement costs.

[0074] Based on the above embodiments, please refer to Figure 3 The outer wall of the sealing surface is provided with an annular boss 14 coaxial with the through hole 11, and the inner diameter of the annular boss 14 is the same as the diameter of the through hole 11. The sealing element 13 is provided on the end face of the annular boss 14 away from the oil storage box 1.

[0075] It is understandable that the sealing surface has a through hole 11, and the outer wall of the sealing surface contacts the outer shell of the oil tank 3. Thus, the outer wall of the sealing surface is arranged around the through hole 11, which serves to seal the outer shell of the oil storage box 1 and the oil tank 3. Since the oil storage box 1 is pressed tightly against the outer shell of the oil tank 3 by the second set of fasteners 23, the sealing element 13 is subjected to a large pressure. If the pressure is too high, it will damage the sealing performance of the sealing element 13.

[0076] Therefore, an annular boss 14 is provided on the outer wall of the sealing surface around the through hole 11, and the sealing element 13 is disposed on the annular boss 14. In this way, the annular boss 14 can distribute pressure, so that the sealing element 13 can maintain stable sealing performance even under high pressure.

[0077] Furthermore, an annular groove (not shown in the figure) is provided on the end face of the annular boss 14 away from the oil reservoir 1, and the seal 13 is an O-ring seal with a portion embedded in the annular groove. In this way, compared with the conventional method of pasting the seal 13 with adhesive, embedding and fixing a portion of the seal 13 in the annular groove can greatly improve the stability of the seal 13 installation and effectively prevent the seal 13 from falling off.

[0078] Based on the above embodiments, please refer to Figure 2 The oil storage box 1 has a notch 17 at the top of the sealing surface, and the notch 17 is L-shaped.

[0079] Understandably, the top of the outer shell of the fuel tank 3 generally has an outer edge, which can affect the sealing fit between the sealing surface of the fuel reservoir 1 and the outer shell of the fuel tank 3. Therefore, a notch 17 is provided at the top of the fuel reservoir 1 near the sealing surface to prevent the outer edge from interfering with the sealing fit between the sealing surface and the outer shell of the fuel tank 3. Furthermore, this notch 17 is L-shaped, allowing the outer edge of the top of the fuel tank 3 to abut against the transverse section of the L-shaped notch 17, which further improves the stability of the fuel reservoir 1 installation.

[0080] It should be noted that the flange mounting base 5 consists of an integrally formed flange 51 and a cylindrical seat 52. The seat 52 is fixed on the outer shell of the oil tank 3, and the flange 51 is used to connect the valve seat 41 of the pressure relief valve 4.

[0081] Based on the above embodiments, please refer to Figure 2 and Figure 4The chuck 21 includes a semi-circular disc 211 and a semi-circular boss 212 coaxially disposed on one end face of the disc. Thus, the split-type fastener 2 consists of a disc and a boss on one end face. The disc and boss can be fitted onto the seat 52 of the flange mounting base 5. The disc abuts against the flange 51 of the flange mounting base 5, and the boss abuts against the inner wall of the sealing surface. This structure not only allows the split-type fastener 2 to fit better into the flange mounting base 5, but also ensures a more secure installation.

[0082] For details regarding the specific settings of the first set of fasteners 22 on the split-type fastener 2, please refer to [link / reference needed]. Figure 2 and Figure 4 The semi-circular boss 212 has several insertion holes distributed perpendicular to its axial direction. Two semi-circular bosses 212 are joined together, and their insertion holes overlap to form a first mounting hole. The first mounting hole is used for the first fastener in the first set of fasteners 22 to pass through. In this way, the two chucks 21 can be prevented from shifting during the joining process, ensuring that the two chucks 21 are symmetrically joined into a circular disc, so as to better fit around the outer circumference of the cylindrical base 52 and abut against the flange 51.

[0083] For details on the specific settings of the second set of fasteners 23 on the split fastener 2, please refer to [link / reference]. Figure 2 and Figure 4 The semi-circular ring 211 is provided with a plurality of second mounting holes spaced apart around its axial direction. The second mounting holes are used for the second fasteners in the second set of fasteners 23 to pass through. Preferably, the second mounting holes on the two semi-circular rings 211 are symmetrically arranged in pairs with their axes as the center, which can improve the stability of the split fastener 2 structure.

[0084] Based on the above embodiment, the outer periphery of the semi-circular boss 212 is provided with a number of clearance grooves (not shown in the figure) extending along its axial direction, and the number of clearance grooves corresponds one-to-one with the number of second mounting holes.

[0085] It is understandable that the fasteners, i.e. bolts, in the second set of fasteners 23 need to pass through the second mounting hole and abut against the inner wall of the sealing surface. Therefore, the fasteners must pass through the semi-circular boss 212. In order to avoid the semi-circular boss 14 interfering with the fasteners, the outer periphery of the semi-circular boss 14 is provided with a relief groove corresponding to the second mounting hole. The relief groove extends along the axial direction of the annular boss 14, thereby serving to avoid the second set of fasteners 23.

[0086] It should be noted that if both the first set of fasteners 22 and the second component fasteners consist of several bolts, then both the first mounting hole and the second mounting hole are bolt holes that mate with the bolt threads.

[0087] The present invention also provides a method for replacing a transformer pressure relief valve using the tooling for replacing the transformer pressure relief valve disclosed in the above embodiments, the specific steps of which include:

[0088] S1. Align the through hole on the sealing surface with the pressure relief valve and flange mounting base, and install them into the oil reservoir.

[0089] S2. Remove the first set of fasteners on the split fastener and separate them into two chucks. The two chucks and the first set of fasteners are inserted into the oil storage box through the top opening of the oil storage box.

[0090] S3. Move the two chucks between the flange and the inner wall of the sealing surface, and then use the first set of fasteners to join the two chucks together.

[0091] S4. Insert the second set of fasteners into the inside of the oil reservoir through the top opening of the oil reservoir;

[0092] S5. Pass the second set of fasteners through the split fastener and press it against the inner wall of the sealing cover until the seal fits tightly against the outer shell of the oil tank, and the oil storage box is fixed on the outer shell of the oil tank.

[0093] S6. Pour transformer oil into the oil conservator through the top opening until the oil level in the conservator is equal to the oil level in the tank.

[0094] S7. Remove the old pressure relief valve from the flange mount and remove it through the top opening of the oil reservoir.

[0095] S8. Move the new pressure relief valve through the top opening of the oil reservoir and reassemble it on the flange mounting base to complete the pressure relief valve replacement.

[0096] S9. Remove the second set of fasteners to separate the outer shell of the oil reservoir and the oil tank.

[0097] It should be noted that in the existing technology, please refer to... Figure 7 The transformer oil tank also includes a valve cover 6 that covers the pressure relief valve 4 to prevent external impurities from entering the pressure relief valve 4, thereby improving the service life of the pressure relief valve 4.

[0098] Therefore, before performing S1 above, the transformer pressure relief valve replacement method of the present invention further includes: S0, first removing the valve cover.

[0099] Furthermore, prior to performing S9, the transformer pressure relief valve replacement method of the present invention further includes: S10, opening the switch valve to drain the transformer oil from the oil reservoir. This prevents oil leakage from the oil reservoir 1, enabling oil recycling and effectively avoiding oil waste that would increase replacement costs.

[0100] In summary, the present invention has the following beneficial effects:

[0101] 1. The pressure relief valve can be replaced on-site without draining the transformer oil tank, eliminating the need to return it to the factory. This is efficient, convenient, and reduces the costs of returning the valve to the factory and vacuum oil injection.

[0102] 2. The split-type fastener adopts a split and detachable design, which makes it easy to install in narrow spaces, thus facilitating the fixing of the oil storage box and the outer shell of the oil tank.

[0103] 3. A sealing element is installed on the sealing surface of the oil storage box to seal the outer shell of the oil storage box and the oil tank, thereby avoiding oil leakage when replacing the pressure relief valve and effectively reducing the replacement cost of the pressure relief valve.

[0104] 4. An oil drain pipe is installed at the bottom of the oil storage box, which can drain the oil in the oil storage box 1 before removing the oil storage box from the outer shell of the oil tank, so as to realize the recycling of oil and effectively avoid the situation of oil waste and increased replacement costs.

[0105] It should be noted that in the above text, "first," "second," "third," and "fourth" are used only to describe the effect and should not be interpreted as indicating or implying relative importance.

[0106] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0107] The above provides a detailed description of the tooling and method for replacing a transformer pressure relief valve provided by this invention. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this invention. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. A tooling for replacing a transformer pressure relief valve, used in a transformer oil tank, characterized in that, The transformer oil tank includes an oil tank (3), a flange mounting seat (5), and a pressure relief valve (4). The flange mounting seat (5) is located on the outer shell of the oil tank (3). The valve seat of the pressure relief valve (4) is located on the flange (51) of the flange mounting seat (5), and the spring at its end is inserted into the flange mounting seat (5). The tooling includes: An oil storage box (1) has an opening (12) at its top. One side of the oil storage box (1) is a sealing surface and has a through hole (11). The through hole (11) is used for the pressure relief valve (4) and its connected flange mounting seat (5) to pass through and be installed in the oil storage box (1). The outer wall of the sealing surface is provided with a sealing element (13) around the through hole (11). The sealing element (13) is used to tightly fit the outer shell of the oil tank (3). Two chucks (21) are symmetrically assembled together by a first set of fasteners (22) to form a split fastener (2), which is used to abut against the flange (51) of the flange mounting seat (5) and the inner wall of the sealing surface. The split fastener (2) is provided with a second set of fasteners (23) that can be disassembled. The second set of fasteners (23) is pressed against the inner wall of the sealing surface to fix the oil storage box (1) on the outer shell of the oil tank (3).

2. The tooling for replacing the transformer pressure relief valve according to claim 1, characterized in that, An oil drain pipe (15) connecting the inside and outside of the oil storage box (1) is inserted at the bottom of the other side of the oil storage box (1), and a switch valve (16) is provided on the oil drain pipe (15).

3. The tooling for replacing the transformer pressure relief valve according to claim 1, characterized in that, The outer wall of the sealing surface is provided with an annular boss (14) coaxial with the through hole (11), and the inner diameter of the annular boss (14) is the same as the diameter of the through hole (11). The sealing element (13) is provided on the end face of the annular boss (14) away from the oil storage box (1).

4. The tooling for replacing the transformer pressure relief valve according to claim 3, characterized in that, The annular boss (14) has an annular groove on its end face away from the oil storage box (1), and the sealing element (13) is an O-ring and part of it is embedded in the annular groove.

5. The tooling for replacing the transformer pressure relief valve according to claim 1, characterized in that, The oil storage box (1) has a notch (17) at the top of the sealing surface, and the notch (17) is L-shaped.

6. The tooling for replacing the transformer pressure relief valve according to any one of claims 1 to 5, characterized in that, The chuck (21) includes a semi-circular disc (211) and a semi-circular boss (212) coaxially disposed on one side end face of it. The semi-circular disc (211) is provided with a plurality of second mounting holes spaced apart around its axial direction. The second mounting holes are used for the second fasteners in the second set of fasteners (23) to pass through. The semi-circular boss (212) is provided with a plurality of insertion holes distributed along its axial direction. Two semi-circular bosses (212) are joined together and their insertion holes overlap to form a first mounting hole. The first mounting hole is used for the first fastener in the first set of fasteners (22) to pass through.

7. The tooling for replacing the transformer pressure relief valve according to claim 6, characterized in that, The outer periphery of the semi-circular boss (212) is provided with a plurality of clearance grooves extending along its axial direction, and the plurality of clearance grooves correspond one-to-one with the plurality of second mounting holes.

8. A method for replacing a transformer pressure relief valve using the tooling for replacing a transformer pressure relief valve as described in any one of claims 1 to 7, characterized in that, The method for replacing the transformer pressure relief valve includes: Align the through hole on the sealing surface with the pressure relief valve and the flange mounting seat, and install them into the interior of the oil reservoir; The first set of fasteners on the split fastener is removed and divided into two chucks. Both chucks and the first set of fasteners are inserted into the oil storage box through the top opening of the oil storage box. The two chucks are moved between the flange and the inner wall of the sealing surface, and then the two chucks are joined together using the first set of fasteners; Insert the second set of fasteners into the inside of the oil storage box through the top opening of the oil storage box; The second set of fasteners is passed through the split-type fixing member and pressed against the inner wall of the sealing surface until the sealing member is tightly attached to the outer shell of the oil tank, and the oil storage box is fixed to the outer shell of the oil tank; Transformer oil is injected from the top opening of the oil conservator until the oil level in the oil conservator is equal to the oil level in the oil tank. Remove the old pressure relief valve from the flange mount and remove it through the top opening of the oil reservoir; The new pressure relief valve is moved in through the top opening of the oil reservoir and reassembled on the flange mounting base to complete the pressure relief valve replacement. Remove the second set of fasteners to separate the outer casing of the oil storage box and the oil tank.

9. The method for replacing the transformer pressure relief valve according to claim 8, characterized in that, The transformer oil tank also includes a valve cover fitted over the pressure relief valve; the method for replacing the transformer pressure relief valve further includes: Remove the valve cover before aligning the through-hole on the sealing surface with the pressure relief valve and the flange mount and inserting them into the oil reservoir.

10. The method for replacing the transformer pressure relief valve according to claim 8, characterized in that, An oil drain pipe connecting the inside and outside of the oil storage box is inserted into the bottom of the other side of the oil storage box, and a switch valve is provided on the oil drain pipe; the method for replacing the transformer pressure relief valve also includes: Before removing the second set of fasteners, open the switch valve to drain the transformer oil from the oil reservoir.

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