Tool and method for replacing pressure relief valve of transformer

Abstract

The tool for replacing the pressure relief valve of the transformer comprises an oil storage box, the top end of the oil storage box is provided with an opening, one side face of the oil storage box is a sealing face and provided with a through hole, and the through hole is used for allowing the pressure relief valve and a flange installation base connected with the pressure relief valve to penetrate through and be installed in the oil storage box; a sealing piece surrounding the through hole is arranged on the outer wall of the sealing surface; the two chucks are detachably and symmetrically spliced together through a first group of fasteners to form a split type fixing piece, the split type fixing piece is used for being connected between the flange plate of the flange mounting seat and the inner wall of the sealing surface in an abutting mode, the split type fixing piece is provided with a second group of detachable fasteners in a penetrating mode, and the second group of fasteners are tightly pressed on the inner wall of the sealing surface. The oil storage box is fixed to a shell of the oil tank. The pressure relief valve can be replaced on site under the state that the transformer oil tank does not drain oil, replacement can be achieved without returning to a factory, efficiency and convenience are achieved, and returning transportation cost and vacuum oil injection cost are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer pressure relief valve replacement, and more specifically, to a tool for replacing a transformer pressure relief valve. In addition, the present invention also relates to a transformer pressure relief valve replacement method using the tool for replacing a transformer pressure relief valve. Background Art

[0002] The transformer is immersed in the oil tank, which plays a role in cooling and isolating to ensure the safe and stable operation of the transformer. When a fault occurs in the oil tank, the oil in the oil tank will be decomposed and gasified to produce a large amount of gas, and the pressure in the oil tank will rise sharply. If it is not released in time, it will cause the oil tank to deform or even burst. Therefore, a pressure relief valve needs to be installed on the outer shell of the oil tank to ensure that the oil tank remains within the safe pressure range and avoid 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 arranged 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, thereby realizing the detachable setting of the pressure relief valve and ensuring the sealing of the connection.

[0004] However, if the pressure relief valve fails or leaks oil and needs to be replaced, it cannot be directly disassembled and replaced for repair. The transformer oil tank must be returned to the factory for oil draining, and the pressure relief valve must be replaced after the oil is drained, and finally vacuum oil is refilled. Therefore, the existing pressure relief valve replacement efficiency is low and the replacement cost is extremely high.

[0005] In summary, how to solve the problem of low replacement efficiency and high replacement cost of existing transformer pressure relief valves is an urgent problem to be solved by technical personnel in this field. Summary of the invention

[0006] In view of this, an object of the present invention is to provide a tool for replacing a transformer pressure relief valve, which can replace the pressure relief valve without draining oil from the transformer tank, so as to improve the replacement efficiency of the pressure relief valve and reduce 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-mentioned tooling for replacing the transformer pressure relief valve.

[0008] In order to achieve the above object, the present invention provides the following technical solutions:

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

[0010] An oil storage box, the top of which is set as an opening, one side of the oil storage box is a sealing surface and is provided with a through hole, the through hole is used for the pressure relief valve and the flange mounting seat connected thereto to pass through and be installed in the oil storage box, and the outer wall of the sealing surface is provided with a sealing member surrounding the through hole, the sealing member is used to closely fit the outer shell of the oil tank;

[0011] The two chucks are symmetrically assembled together in a detachable manner through a first set of fasteners to form a split fixing component, which is used to abut between the flange plate of the flange mounting seat and the inner wall of the sealing surface, and the split fixing component is penetrated by a detachable second set of fasteners, which are pressed against the inner wall of the sealing surface to fix the oil storage box on the outer shell of the oil tank.

[0012] 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.

[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, and the sealing member is provided on the end surface of the annular boss away from the oil storage box.

[0014] Preferably, an annular groove is provided on the end surface of the annular boss away from the oil storage box, and the sealing member is an O-ring and a part of the sealing member is embedded in the annular groove.

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

[0016] Preferably, the chuck comprises a semi-circular ring disk and a semi-circular ring boss coaxially arranged on one end surface thereof;

[0017] The semicircular ring disk is provided with a plurality of second mounting holes spaced apart around the axial direction thereof, wherein the second mounting holes are used for the second fasteners in the second group of fasteners to pass through;

[0018] The semicircular boss is provided with a plurality of insertion holes distributed perpendicular to its axial direction. Two semicircular bosses are spliced ​​together and the insertion holes of the two overlap to form a first mounting hole, and 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 semicircular boss is provided with a plurality of avoidance grooves extending along its axial direction, and the plurality of avoidance grooves correspond one-to-one to the plurality of the second mounting holes.

[0020] A method for replacing a transformer pressure relief valve using any of the above-mentioned tooling for replacing a transformer pressure relief valve, which is used for a transformer oil tank, wherein the transformer oil tank comprises an oil tank, a flange mounting seat and a pressure relief valve, wherein the flange mounting seat is arranged on an outer shell of the oil tank, and a valve seat of the pressure relief valve is arranged on a flange of the flange mounting seat, and a spring at an end thereof is inserted into the flange mounting seat; the method for replacing a transformer pressure relief valve comprises:

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

[0022] The first group of fasteners on the split fixing member is removed to separate into two chucks, and the two chucks and the first group of fasteners are placed into the oil storage box through the top opening of the oil storage box;

[0023] Move the two chucks between the flange and the inner wall of the sealing surface, and then assemble the two chucks together using the first set of fasteners;

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

[0025] Pass the second set of fasteners through the split fixing member to press the inner wall of the sealing surface until the sealing member is tightly fitted to the outer shell of the oil tank, and the oil storage box is fixed on the outer shell of the oil tank;

[0026] Injecting transformer oil from the top opening of the oil storage box until the oil level of the oil storage box is equal to the oil level of the oil tank;

[0027] Remove the old pressure relief valve from the flange mounting seat and move it out through the top opening of the oil storage box;

[0028] Move the new pressure relief valve into the oil storage box through the top opening and reassemble it on the flange mounting seat to complete the replacement of the pressure relief valve;

[0029] The second set of fasteners is removed to separate the oil storage box and the outer shell of the oil tank.

[0030] Preferably, the transformer oil tank further comprises a valve cover arranged on the pressure relief valve; and the transformer pressure relief valve replacement method further comprises:

[0031] Before aligning the through hole on the sealing surface with the pressure relief valve and the flange mounting seat and installing the two into the interior of the oil storage box, the valve cover is removed.

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

[0033] Before removing the second set of fasteners, open the switch valve to drain the transformer oil in the oil storage box.

[0034] The specific process of replacing the transformer pressure relief valve with the tooling provided by the present invention is as follows:

[0035] Step 1: Place the sealing surface of the oil storage box toward the side of the transformer oil tank having the pressure relief valve, align the through hole on the sealing surface with the pressure relief valve, and move the oil storage box toward the pressure relief valve so that the pressure relief valve and the flange mounting seat connected thereto are installed into the interior of the oil storage box through the through hole;

[0036] Step 2: remove the first set of fasteners on the split fixing member and separate them into two chucks, and put the two independent chucks and the first set of fasteners into the oil storage box through the top opening of the oil storage box;

[0037] Step 3, move both chucks to between the flange and the inner wall of the sealing surface, and then assemble the two chucks together using the first set of fasteners;

[0038] Step 4: Place the second set of fasteners into the oil storage box through the top opening of the oil storage box;

[0039] Step 5: Pass the second set of fasteners through the split fixing piece and press the inner wall of the sealing cover until the sealing piece fits tightly against the outer shell of the fuel tank, and the fuel storage box is fixed on the outer shell of the fuel tank;

[0040] Step 6, injecting transformer oil from the top opening of the oil storage box until the oil level of the oil storage box is equal to the oil level of the oil tank, at which time the oil storage box and the transformer oil tank are at the same level;

[0041] Step 7: Remove the old pressure relief valve from the flange mounting seat and move it out through the top opening of the oil storage box. It should be noted that since the oil storage box and the transformer tank have the same liquid level, the hydraulic pressure of the oil storage box and the transformer tank is also equal, the pressure difference disappears, no siphoning occurs, and the oil in the oil storage box and the transformer does not flow, even if the oil in the transformer tank does not leak out;

[0042] Step 8: Move the new pressure relief valve through the top opening of the oil storage box and reassemble it on the flange mounting seat to complete the replacement of the pressure relief valve;

[0043] Step nine, remove the second set of fasteners to remove the oil storage box from the outer shell of the oil tank.

[0044] In summary, the transformer pressure relief valve replacement tool provided by the present invention can replace the pressure relief valve on-site without draining oil from the transformer oil tank. It can be replaced without returning to the factory, which is efficient and convenient, and reduces the return transportation cost and vacuum oil filling cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0046] Figure 1 It is a schematic diagram of assembling the tooling for replacing the transformer pressure relief valve provided by the present invention and the transformer oil tank;

[0047] Figure 2 for Figure 1 A partial cross-sectional view of

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

[0049] Figure 4 A schematic diagram of the structure of a split type fixing member provided by the present invention;

[0050] Figure 5 It is a schematic diagram of assembling the oil tank and the flange mounting seat of the transformer oil tank in the prior art;

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

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

[0053] Reference numerals:

[0054] 1- oil storage box; 2- split fixing piece; 3- oil tank; 4- pressure release valve; 5- flange mounting seat; 6- valve cover;

[0055] 11-through hole; 12-opening; 13-seal; 14-annular boss; 15-oil drain pipe; 16-on / off valve; 17-notch;

[0056] 21-chuck; 22-first set of fasteners; 23-second set of fasteners; 211-semicircular ring disk; 212-semicircular ring boss;

[0057] 41-valve seat; 42-spring;

[0058] 51-flange; 52-seat body. DETAILED DESCRIPTION

[0059] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0060] The core of the present invention is to provide a tool for replacing a transformer pressure relief valve, which can replace the pressure relief valve without draining oil from the transformer oil tank, so as to improve the replacement efficiency of the pressure relief valve and save the replacement cost of the pressure relief valve.

[0061] Another core of the present invention is to provide a transformer pressure relief valve replacement method using the above-mentioned transformer pressure relief valve replacement tool.

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

[0063] Please refer to Figure 1 and Figure 2 The present invention provides a tool for replacing a transformer pressure relief valve, comprising an oil storage box 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 and is provided with a through hole 11. The through hole 11 is used for the pressure relief valve 4 and the flange mounting seat 5 connected thereto to pass through and be installed in the oil storage box 1, and the outer wall of the sealing surface is provided with a sealing member 13 surrounding the through hole 11. The sealing member 13 is used to fit tightly against the outer shell of the oil tank 3.

[0065] The two chucks 21 are detachably and symmetrically assembled together through a first set of fasteners 22 to form a split fixing part 2, which is used to abut between the flange plate 51 of the flange mounting seat 5 and the inner wall of the sealing surface, and the split fixing part 2 is penetrated by a detachable second set of fasteners 23, which are pressed against the inner wall of the sealing surface and are used to fix the oil storage box 1 on the outer shell of the oil tank 3.

[0066] It should be noted that this tool is used to remove the pressure relief valve 4 on the transformer tank. In the prior art, 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 body 52 of the flange mounting seat 5 is arranged on the outer shell of the oil tank 3. The valve seat 41 of the pressure relief valve 4 is arranged on the flange plate 51 of the flange mounting seat 5 and the spring 42 at its end passes through the flange plate 51 and is inserted into the seat body 52.

[0067] Specifically, an opening 12 is provided at the top of the oil storage box 1, and the opening 12 can be used for the split fixing member 2 to move into the oil storage box 1 in a split state, and provides an operation port for the operator to screw the first set of fasteners 22 and the second set of fasteners 23. A through hole 11 is provided on one side of the oil storage box 1, and the diameter of the 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 in the oil storage box 1 through the through hole 11. The side of the oil storage box 1 with the through hole 11 is a sealing surface, which needs to be in sealing contact with the outer shell of the oil tank 3 to avoid the oil leakage caused by the gap between the oil storage box 1 and the outer shell of the oil tank 3. The specific sealing method is that a sealing member 13 arranged around the through hole 11 is provided on the outer wall of the sealing surface. Preferably, the sealing member 13 is an O-ring, so that the sealing member 13 is tightly attached to the outer shell of the oil tank 3, so that the oil storage box 1 and the outer shell of the oil tank 3 can be sealed and installed.

[0068] In addition, a fixing part is required to fix the oil storage box 1 to the outer shell of the oil tank 3. However, since the oil storage box 1 only has an opening 12 at the top and the internal space of the oil storage box 1 is limited, great requirements are placed on the size and structure of the fixing part. In order to facilitate the assembly of the split fixing part 2, the present invention provides a split fixing part 2, the split fixing part 2 is composed of two chucks 21, and the two chucks are detachably and symmetrically assembled together through a first group of fasteners 22 to realize the detachable function of the split fixing part 2, so as to better adapt to the installation in a narrow space. Among them, the first group of fasteners 22 is composed of a plurality of bolts, and the two chucks 21 are symmetrically assembled into a whole by bolts, which is not only more convenient for disassembly and assembly of the split fixing part 2, but also the relative distance between the two chucks 21 can be adjusted by adjusting the tightening degree of the bolts, thereby realizing the adjustment of the size of the split fixing part 2.

[0069] The present invention also uses a second set of fasteners 23 to seal and press the oil storage box 1 against the outer shell of the oil tank 3. The second set of fasteners 23 passes through the split fixing member 2 and is pressed against the inner wall of the sealing surface, so that the sealing member 13 on the outer wall of the sealing surface is closely attached to the outer shell of the oil tank 3, and the reaction force of the flange plate 51 of the flange mounting seat 5 is used to fix the oil storage box 1 on the outer shell of the oil tank 3. Preferably, the second set of fasteners 23 is also composed of a plurality of bolts, which not only facilitates the disassembly and assembly of the split fixing member 2, but also can adjust the tightness between the oil storage box 1 and the oil tank 3 by adjusting the tightening degree of the bolts.

[0070] In summary, in the above-mentioned tooling for replacing the transformer pressure relief valve, the oil storage box 1 can be fixed on the outer shell of the oil tank 3 through the split fixing part 2 and the pressure relief valve 4 and the flange mounting seat 5 can be installed through the through hole 11. In this way, before removing the pressure relief valve 4, the transformer oil can be injected from the top opening 12 of the oil storage box 1 until the oil level of the oil storage box 1 is equal to the oil level of the oil tank 3. At this time, the oil storage box 1 and the transformer oil tank are at the same level, and then the pressure relief valve 4 is removed. After removal, even if the oil storage box 1 and the oil tank 3 are connected through the through hole 11, since the oil storage box 1 and the transformer oil tank are at the same level, the hydraulic pressure of the oil storage box 1 and the transformer oil tank is also equal, the pressure difference disappears, and the siphon phenomenon does not occur. The oil storage box 1 and the oil in the transformer do not flow, even if the oil in the transformer oil tank does not leak out. Therefore, this tooling can replace the pressure relief valve 4 on the spot without draining the oil from the transformer oil tank, and can be replaced without returning to the factory. It is efficient and convenient, and reduces the transportation cost of returning to the factory and the cost of vacuum oil filling.

[0071] Based on the above examples, please refer to Figure 2 An oil drain pipe 15 communicating with 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 other side of the oil storage box 1 facing away from its sealing surface, and one end of the oil drain pipe 15 is inserted into the interior of the oil storage box 1 through the oil 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 achieve 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 utilizing the gravity of the oil itself. In addition, a switch valve 16 is provided on the part of the oil drain pipe 15 located outside the oil storage box 1, and the switch valve 16 is used to control the on-off of the oil drain pipe 15, so as 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, and the type is not unique, and can be adaptively selected according to specific needs, as long as it can control the on-off of the oil drain pipe 15.

[0073] Therefore, before removing the second set of fasteners 23, that is, before separating the oil storage box 1 from the outer shell of the oil tank 3, the switch valve 16 can be opened to drain the oil in the oil storage box 1, and then the second set of fasteners 23 can be removed to remove the oil storage box 1 from the outer shell of the oil tank 3. In this way, the oil in the oil storage box 1 can be prevented from leaking, so that the oil can be reused, and the situation of wasting oil and increasing replacement costs can be effectively avoided.

[0074] Based on the above examples, 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 member 13 is provided on the end surface of the annular boss 14 away from the oil storage box 1.

[0075] It can be understood 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, so that the sealing member 13 is provided with the outer wall of the sealing surface around the through hole 11, so as to seal the outer shell of the oil storage box 1 and the oil tank 3. Since the oil storage box 1 is pressed against the outer shell of the oil tank 3 by the second set of fasteners 23, the sealing member 13 is subjected to a relatively large pressure, and if the pressure is too large, the sealing performance of the sealing member 13 will be destroyed.

[0076] Thus, an annular boss 14 is arranged around the through hole 11 on the outer wall of the sealing surface, and the sealing member 13 is arranged on the annular boss 14. In this way, the annular boss 14 can disperse the pressure, so that the sealing member 13 can maintain stable sealing performance under high pressure.

[0077] Furthermore, an annular groove (not shown) is provided on the end surface of the annular boss 14 away from the oil storage box 1, and the seal 13 is an O-ring and part of it is embedded in the annular groove. In this way, compared with the conventional method of sticking the seal 13 with an adhesive, the seal 13 is partially embedded and fixed in the annular groove, which can greatly improve the stability of the installation of the seal 13 and effectively prevent the seal 13 from falling off.

[0078] Based on the above examples, please refer to Figure 2 A notch 17 is provided at the top of the oil storage box 1 adjacent to the sealing surface, and the notch 17 is L-shaped.

[0079] It is understandable that the top of the outer shell of the oil tank 3 generally has an outer edge, which will affect the tight sealing between the sealing surface of the oil storage box 1 and the outer shell of the oil tank 3. Therefore, a notch 17 is provided at the top of the oil storage box 1 adjacent to the sealing surface to prevent the outer edge from interfering with the tight sealing between the sealing surface and the outer shell of the oil tank 3. Furthermore, the notch 17 is L-shaped, so that the outer edge of the top of the oil tank 3 can abut against the transverse section of the L-shaped notch 17, which is conducive to further improving the stability of the installation of the oil storage box 1.

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

[0081] Based on the above examples, please refer to Figure 2 and Figure 4The chuck 21 includes a semicircular ring disk 211 and a semicircular ring boss 212 coaxially arranged on one end face thereof. In this way, the split fixing member 2 is composed of a circular ring disk and a circular ring boss arranged on one end face thereof, wherein the circular ring disk and the circular ring boss can be sleeved on the seat body 52 of the flange mounting seat 5, the circular ring disk abuts against the flange disk 51 of the flange mounting seat 5, and the circular ring boss abuts against the inner wall of the sealing surface. The split fixing member 2 with this structural arrangement can not only be better sleeved into the flange mounting seat 5, but also ensure that the split fixing member 2 is installed more firmly.

[0082] For details on the arrangement of the first set of fasteners 22 on the split fastener 2, please refer to Figure 2 and Figure 4 The semicircular boss 212 is provided with a plurality of insertion holes distributed perpendicular to the axial direction thereof. The two semicircular bosses 212 are assembled together and the insertion holes of the two overlap to form a first mounting hole, and the first mounting hole is used for passing the first fastener in the first group of fasteners 22. In this way, the two chucks 21 can be prevented from being offset during the assembly process, and the two chucks 21 can be symmetrically assembled into a circular disk, so as to better fit the outer periphery of the cylindrical seat body 52 and abut against the flange 51.

[0083] For details on the arrangement of the second set of fasteners 23 on the split fastener 2, please refer to Figure 2 and Figure 4 The semicircular ring disk 211 is provided with a plurality of second mounting holes spaced around the axial direction thereof, and the second mounting holes are used for passing the second fasteners in the second group of fasteners 23. Preferably, the second mounting holes on the two semicircular ring disks 211 are symmetrically arranged in pairs with their axes as the center, which can improve the stability of the structure of the split fixing member 2.

[0084] On the basis of the above-mentioned embodiment, the outer periphery of the semicircular ring boss 212 is provided with a plurality of avoidance grooves (not shown in the figure) extending along the axial direction thereof, and the plurality of avoidance grooves correspond one-to-one to the plurality of second mounting holes.

[0085] It can be understood that the fasteners in the second group of fasteners 23, i.e., the bolts, need to pass through the second mounting holes and abut against the inner wall of the sealing surface. Therefore, the fasteners must pass through the semicircular annular boss 212. In order to avoid the semicircular annular boss 14 interfering with the fasteners, an avoidance groove corresponding to the second mounting hole is provided on the outer periphery of the semicircular annular boss 14. The avoidance groove is arranged along the axial extension of the annular boss 14, thereby avoiding the second group of fasteners 23.

[0086] It should be noted that if the first group of fasteners 22 and the second group of fasteners are both composed of a plurality of bolts, then the first mounting hole and the second mounting hole are both bolt holes that match the bolt threads.

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

[0088] S1. Align the through hole on the sealing surface with the pressure relief valve and the flange mounting seat and install the two into the oil storage box;

[0089] S2, removing the first set of fasteners on the split fixing member and separating them into two chucks, and placing the two chucks and the first set of fasteners 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 assemble the two chucks together using the first set of fasteners;

[0091] S4, placing the second set of fasteners into the interior of the oil storage box through the top opening of the oil storage box;

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

[0093] S6. Inject transformer oil from the top opening of the oil storage box until the oil level in the oil storage box is equal to the oil level in the oil tank;

[0094] S7. Remove the old pressure relief valve from the flange mounting seat and move it out through the top opening of the oil storage box;

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

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

[0097] It should be noted that in the prior art, please refer to Figure 7 The transformer oil tank also includes a valve cover 6 arranged on the pressure relief valve 4 to prevent foreign matter from entering the pressure relief valve 4 so as to increase the service life of the pressure relief valve 4.

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

[0099] Furthermore, before executing the above S9, the transformer pressure relief valve replacement method of the present invention further includes: S10, opening the switch valve to drain the transformer oil in the oil storage box. This can prevent the oil in the oil storage box 1 from leaking out, so as to achieve oil recycling and effectively avoid the situation where oil waste increases 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 oil from the transformer tank. It can be replaced without returning to the factory. It is efficient and convenient, and reduces the cost of returning to the factory for transportation and vacuum oil filling.

[0102] 2. The split fixings adopt a split detachable design, which is convenient for installation in narrow spaces, thereby facilitating the fixing of the oil storage box and the outer shell of the oil tank.

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

[0104] 4. An oil drain pipe is provided at the bottom of the oil storage box, so that the oil in the oil storage box 1 can be drained before the oil storage box is removed from the outer shell of the oil tank, so as to realize oil recycling and effectively avoid the situation where oil is wasted and the replacement cost is increased.

[0105] It should be noted that, in the above text, “first”, “second”, “third” and “fourth” are only used to describe the effects and cannot be understood as indicating or implying relative importance.

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

[0107] The above is a detailed introduction to a tooling and replacement method for a transformer pressure relief valve provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A tool for replacing a transformer pressure relief valve, characterized in that: include: An oil storage box (1) having a top end formed as an opening (12), a side surface of the oil storage box (1) being a sealing surface and provided with a through hole (11), the through hole (11) being used for allowing a pressure relief valve (4) and a flange mounting seat (5) connected thereto to pass through and be installed in the oil storage box (1), and an outer wall of the sealing surface being provided with a sealing member (13) surrounding the through hole (11), the sealing member (13) being used for tightly fitting the outer shell of the oil tank (3); The two chucks (21) are detachably and symmetrically assembled together through a first set of fasteners (22) to form a split fixing member (2) for abutting between a flange plate (51) of the flange mounting seat (5) and an inner wall of the sealing surface, and the split fixing member (2) is provided with a detachable second set of fasteners (23), the second set of fasteners (23) being pressed against the inner wall of the sealing surface and being used to fix the oil storage box (1) on the outer shell of the oil tank (3).

2. The tooling for replacing a transformer pressure relief valve according to claim 1, characterized in that: An oil drain pipe (15) communicating with 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).

3. The tooling for replacing the transformer pressure relief valve according to claim 1, characterized in that: An annular boss (14) coaxial with the through hole (11) is provided on the outer wall of the sealing surface, 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 surface of the annular boss (14) away from the oil storage box (1).

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

5. The tooling for replacing a transformer pressure relief valve according to claim 1, characterized in that: The oil storage box (1) is provided with a notch (17) at the top adjacent to the sealing surface, and the notch (17) is in an L shape.

6. The tool for replacing a transformer pressure relief valve according to any one of claims 1 to 5, characterized in that: The chuck (21) comprises a semi-circular ring disk (211) and a semi-circular ring boss (212) coaxially arranged on one end surface thereof; The semi-circular ring disk (211) is provided with a plurality of second mounting holes spaced apart around the axial direction thereof, the second mounting holes being used for second fasteners in the second group of fasteners (23) to pass through; The semi-circular boss (212) is provided with a plurality of insertion holes distributed perpendicularly to its axial direction, and two semi-circular bosses (212) are spliced ​​together and the insertion holes of the two overlap to form a first mounting hole, and the first mounting hole is used for a first fastener in the first group of fasteners (22) to pass through.

7. The tooling for replacing a transformer pressure relief valve according to claim 6, characterized in that: The outer periphery of the semicircular annular boss (212) is provided with a plurality of avoidance grooves extending along its axial direction, and the plurality of avoidance grooves correspond one-to-one to 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 according to any one of claims 1 to 7, which is used for a transformer oil tank, characterized in that: The transformer oil tank comprises an oil tank, a flange mounting seat and a pressure relief valve, wherein the flange mounting seat is arranged on the outer shell of the oil tank, the valve seat of the pressure relief valve is arranged on the flange plate of the flange mounting seat and the spring at the end thereof is inserted into the flange mounting seat; The transformer pressure relief valve replacement method comprises: Align the through hole on the sealing surface with the pressure relief valve and the flange mounting seat and install the two into the interior of the oil storage box; The first group of fasteners on the split fixing member is removed to separate into two chucks, and the two chucks and the first group of fasteners are placed into the oil storage box through the top opening of the oil storage box; Move the two chucks between the flange and the inner wall of the sealing surface, and then assemble the two chucks together using the first set of fasteners; Place the second set of fasteners into the oil storage box through the top opening of the oil storage box; Pass the second set of fasteners through the split fixing member to press the inner wall of the sealing surface until the sealing member is tightly fitted to the outer shell of the oil tank, and the oil storage box is fixed on the outer shell of the oil tank; Injecting transformer oil from the top opening of the oil storage box until the oil level of the oil storage box is equal to the oil level of the oil tank; Remove the old pressure relief valve from the flange mounting seat and move it out through the top opening of the oil storage box; Move the new pressure relief valve into the oil storage box through the top opening and reassemble it on the flange mounting seat to complete the replacement of the pressure relief valve; The second set of fasteners is removed to separate the oil storage box and the outer shell of the oil tank.

9. The transformer pressure relief valve replacement method according to any one of claim 8, characterized in that: The transformer oil tank further comprises a valve cover arranged on the pressure relief valve; and the transformer pressure relief valve replacement method further comprises: Before aligning the through hole on the sealing surface with the pressure relief valve and the flange mounting seat and installing the two into the interior of the oil storage box, the valve cover is removed.

10. The transformer pressure relief valve replacement method according to any one of claim 8, characterized in that: An oil drain pipe communicating with the inside and outside of the oil storage box is inserted at the bottom of the other side of the oil storage box, and a switch valve is provided on the oil drain pipe; the transformer pressure relief valve replacement method also includes: Before removing the second set of fasteners, open the switch valve to drain the transformer oil in the oil storage box.

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