Device for disassembling and assembling power transformation equipment bearing shaft pin through liquid nitrogen cooling technology

Abstract

The invention relates to the technical field of power supply maintenance equipment, in particular to a device for disassembling and assembling a bearing shaft pin of power transformation equipment through a liquid nitrogen cooling technology, and the device comprises a liquid nitrogen gun power device, a control bin, a lithium battery, a nitrogen storage module capable of being integrally disassembled, a buffer pipe and a telescopic fixing support. The lithium battery is used for supplying power to the liquid nitrogen gun power device, and the control bin is used for adjusting the power output by the liquid nitrogen gun power device. The control bin is connected with an integrally detachable nitrogen storage module, a nitrogen storage tank is mounted on the integrally detachable nitrogen storage module, and the nitrogen storage tank is used for storing liquid nitrogen; a buffer pipe is installed at the other end of the integrally detachable nitrogen storage module, the other end of the buffer pipe is connected with a telescopic fixing support, the bearing is rapidly cooled to be in a contraction state by means of the extremely low temperature characteristic of liquid nitrogen, and therefore safe disassembly of the bearing is easily achieved.

Description

Technical Field

[0001] The invention relates to the technical field of power supply maintenance equipment, in particular to a device for disassembling and assembling a bearing shaft pin of a transformer equipment by using a liquid nitrogen cooling technology. Background Art

[0002] Substations are an important part of the power system. Their primary equipment includes circuit breakers, disconnectors, transformers, and cooling fans, all of which involve the use of a large number of bearings and shaft pins. During the operation of the equipment, these bearings and shaft pins are prone to various defects, such as wear of the circuit breaker sleeve resulting in incomplete closing, poor opening and closing of the disconnector, oil leakage from the transformer head cover, and wear and tear of the cooling fan bearings that need to be replaced. These defects not only affect the normal operation of the equipment, but may also cause equipment failure and production interruption, increasing maintenance and repair costs.

[0003] Currently, repairing bearing and pin defects usually requires disassembling related components, especially drive shafts and bearings. However, with the improvement of modern equipment processing accuracy, the bearing clearance has gradually become smaller, which makes traditional disassembly methods face increasing challenges. First, traditional disassembly tools such as pullers cannot effectively adapt to the complex and irregular shapes of substation equipment, resulting in low disassembly efficiency and even secondary damage to the bearings. Secondly, the method of using a sledgehammer to hit the bearing is not only laborious, but also easily causes damage to the equipment itself, further complicating maintenance work.

[0004] Although some specialized equipment such as the "balanced force pressing device" has been developed to solve the problem of partial disassembly, the device is large in size, inconvenient to operate, and may cause new side effects to the equipment during use, especially failing to reduce the friction between the bearing and the shaft seat, thereby reducing the difficulty of disassembly and the risk of equipment damage, affecting the safety and stability of the equipment. Summary of the invention

[0005] In response to the above problems, it is necessary to develop a new disassembly method that can effectively improve the disassembly efficiency, reduce the friction between the bearing and the shaft seat, reduce equipment damage, further optimize the bearing disassembly process, and ensure the efficient and safe operation of substation equipment.

[0006] A device for disassembling and assembling a bearing pin of a transformer substation using liquid nitrogen cooling technology, comprising a liquid nitrogen gun power device, a control chamber, a lithium battery, an integrally detachable nitrogen storage module, a buffer tube and a retractable fixed bracket, wherein the liquid nitrogen gun power device is provided with a control chamber and a lithium battery, wherein the lithium battery is used to supply power to the liquid nitrogen gun power device, and the control chamber is used to adjust the power outputted externally by the liquid nitrogen gun power device; the control chamber is connected with an integrally detachable nitrogen storage module, and a nitrogen storage tank is provided on the integrally detachable nitrogen storage module, and the nitrogen storage tank is used to store liquid nitrogen; a buffer tube is provided at the other end of the integrally detachable nitrogen storage module, and a retractable fixed bracket is connected at the other end of the buffer tube, and a cryogenic sleeve for contact heat exchange with a bearing pin to be disassembled is provided at the other end of the retractable fixed bracket, and the buffer tube is used to reduce the flow rate of the buffer nitrogen from the nitrogen storage tank to the cryogenic sleeve; the buffer tube is connected with the cryogenic sleeve, and a push switch for switching the connection relationship is provided between the buffer tube and the cryogenic sleeve, and the retractable fixed bracket is used to adjust the contact position between the cryogenic sleeve and the bearing pin to be disassembled.

[0007] Among them, the retractable fixed bracket includes a cylinder body, which is detachably connected to a buffer tube through a retractable screw cap, and the two ends of the cylinder body are respectively connected to the buffer tube and the low-temperature sleeve, and the outer wall of the cylinder is provided with a thread, and a sliding ring is rotatably connected to the thread, and a plurality of hinge seats are evenly distributed on the sliding ring, and each of the hinge seats is rotatably connected to a sliding rod, and the sliding rod is provided with a sliding groove opened along the length direction, and a fixing ring is fixedly installed on the side of the cylinder away from the retractable screw cap, and a plurality of fork-shaped mounting seats corresponding to the hinge seat are provided on the fixing ring, and each of the fork-shaped mounting seats is provided with a limit pin passing through the corresponding sliding groove, and each of the sliding rods is provided with a barbed claw with a mutually centripetal direction at one end away from the hinge seat.

[0008] Preferably, the outer layer of the nitrogen storage tank is provided with a heat insulating material.

[0009] Preferably, a temperature insulation layer is provided on the outer side of the buffer tube.

[0010] Preferably, the cryogenic sleeve is a trumpet-shaped structure.

[0011] Preferably, the cryogenic sleeve is provided with a graphene heat-conducting layer for increasing the contact area with the bearing pin to be disassembled and assembled.

[0012] Preferably, the control compartment is multi-stage adjustable.

[0013] Preferably, elastic bandages are provided outside the plurality of sliding rods for folding all the sliding rods inwards.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. Utilize the extremely low temperature characteristics of liquid nitrogen to quickly cool the bearing to a contracted state, effectively reducing the interference fit force between the bearing and the shaft pin, thereby easily achieving safe disassembly of the bearing and solving the problem of difficult disassembly caused by insufficient or uneven mechanical force in traditional methods.

[0016] 2. Achieve precise operation and adapt to a variety of equipment: The retractable fixed bracket and retractable screw cap are designed to enable the invention to adapt to bearings of different sizes and types, ensure that the low-temperature sleeve is aligned with the target part of the bearing, and achieve precise cooling and efficient disassembly and assembly. The applicability of the device is improved and it can be widely used in various substation equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below; in all drawings, similar elements or parts are generally identified by similar figure marks; in the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0018] Figure 1 It is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 It is a schematic diagram of the retractable fixed bracket structure.

[0020] In the figure: 1. Liquid nitrogen gun power device; 2. Control chamber; 3. Lithium battery; 4. Nitrogen storage module that can be disassembled as a whole; 5. Nitrogen storage tank; 6. Buffer tube; 7. Push switch; 8. Thermal insulation layer; 9. Retractable fixed bracket; 10. Retractable screw cap; 11. Thread; 12. Sliding ring; 13. Sliding rod; 14. Sliding groove; 15. Fixed ring; 16. Low temperature sleeve; 17. Barb claw; 18. Graphene thermal conductive layer; 19. Limit pin; 20. Fork-type mounting seat. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, but 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.

[0022] The following is combined with Figure 1 and Figure 2, introduces a device for disassembling and assembling a bearing pin of a transformer substation using a liquid nitrogen cooling technology proposed by the present invention, comprising a liquid nitrogen gun power device 1, a control compartment 2, a lithium battery 3, an integrally detachable nitrogen storage module 4, a buffer tube 6 and a retractable fixed bracket 9, the liquid nitrogen gun power device 1 is equipped with a control compartment 2 and a lithium battery 3, the lithium battery 3 is used to supply power to the liquid nitrogen gun power device 1, and the control compartment 2 is used to adjust the power output of the liquid nitrogen gun power device 1 to the outside; the control compartment 2 is connected to the integrally detachable nitrogen storage module 4, the integrally detachable nitrogen storage module 4 is equipped with a nitrogen storage tank 5, and the nitrogen storage tank 5 is used to store liquid nitrogen ; A buffer tube 6 is installed at the other end of the integrally detachable nitrogen storage module 4, and a retractable fixed bracket 9 is connected to the other end of the buffer tube 6. A low-temperature sleeve 16 for contact heat exchange with the bearing shaft pin to be disassembled is installed at the other end of the retractable fixed bracket 9. The buffer tube 6 is used to buffer the flow rate of buffer nitrogen from the nitrogen storage tank 5 to the low-temperature sleeve 16; the buffer tube 6 is connected to the low-temperature sleeve 16, and a push switch 7 for switching the connection relationship is provided between the buffer tube 6 and the low-temperature sleeve 16. The retractable fixed bracket 9 is used to adjust the contact position of the low-temperature sleeve 16 and the bearing shaft pin to be disassembled.

[0023] Among them, the retractable fixed bracket 9 includes a cylinder body, which is detachably connected to the buffer tube 6 through a retractable screw cap 10. The detachable connection provides installation flexibility, and retractable fixed brackets 9 of different types, models and sizes can be quickly replaced on the buffer tube 6. The two ends of the cylinder body are respectively connected to the buffer tube 6 and the low-temperature sleeve 16. The outer wall of the cylinder body is provided with a thread 11, and a sliding ring 12 is rotatably connected to the thread 11. A plurality of hinge seats are evenly distributed on the sliding ring 12, and each of the hinge seats is rotatably connected to a sliding rod 13. The sliding rod 13 is provided with a sliding groove 14 opened along the length direction. A fixing ring 15 is fixedly installed on the side of the cylinder away from the retractable screw cap 10, and a plurality of fork-shaped mounting seats 20 corresponding to the hinge seats are provided on the fixing ring 15. Each of the fork-shaped mounting seats 20 is provided with a limit pin 19 passing through the corresponding sliding groove 14, and each of the sliding rods 13 is provided with a barbed claw 17 with a mutually centripetal direction at one end away from the hinge seat.

[0024] As a preferred solution, the outer layer of the nitrogen storage tank 5 should be provided with insulation material to prevent frostbite to workers. The nitrogen storage tank 5 is a replaceable consumable that is frequently replaced. The insulation material should be rigid, such as a double-layer aluminum plate with fillers such as asbestos and rock wool inside.

[0025] The buffer tube 6 is provided with a thermal insulation layer 8 on the outside to prevent frostbite of the workers. Since this is the position where the workers often hold the device, it is preferred to use synthetic fabrics filled with cotton, hollow resin and other materials to isolate the temperature and improve the holding efficiency while avoiding frostbite.

[0026] The cryogenic sleeve 16 is a trumpet-shaped structure, and the Bernoulli principle is used to change the cross-section from small to large, thereby increasing the cross-section at the outlet position, reducing the flow rate of the liquid nitrogen after gasification on the side of the cryogenic sleeve 16, reducing the recoil force generated thereby, and improving operation safety.

[0027] The low temperature sleeve 16 is provided with a graphene heat conductive layer 18 for increasing the contact area with the bearing pin to be disassembled.

[0028] The control compartment 2 is multi-stage adjustable. In some implementations, the control compartment 2 can be multi-stage adjustable to adapt to different environments or different requirements of bearing pins to be disassembled and assembled.

[0029] An elastic bandage is provided outside the plurality of sliding rods 13 for retracting all the sliding rods 13 inwardly. The elastic bandage retracted inwardly can reduce the margin of movement between the sliding rods 13 and the limit pins 19, so that the two maintain a relatively stable matching state and avoid abnormal noise and looseness.

[0030] In actual use, according to Figure 1 After assembling the various components in the same manner, the sliding ring 12 is rotated toward the side of the low-temperature sleeve 16, and the multiple sliding rods 13 are mutually divergent and expanded away from one end of the sliding ring 12 until the contour formed by the outer edge of the sliding rod 13 opened outward can completely cover the bearing shaft pin to be disassembled and assembled. At this time, the graphene thermal conductive layer 18 is attached to the bearing shaft pin to be disassembled and assembled, and then the sliding ring 12 is rotated toward the side of the telescopic screw cap 10, and the multiple sliding rods 13 are mutually contracted and gathered away from one end of the sliding ring 12 until the outer edge of the sliding rod 13 The barbed claw 17 of the edge will fit and press the bearing shaft pin to be disassembled and the graphene heat conductive layer 18, then select the gear position of the control chamber 2, start the push switch 7, then the low temperature sleeve 16 and the buffer tube 6 are connected, then start the liquid nitrogen gun power device 1, the liquid nitrogen gun power device 1 will transfer the liquid nitrogen in the nitrogen storage tank 5 to the low temperature sleeve 16, so far, the low temperature liquid nitrogen will cool the bearing shaft pin to be disassembled, and under the effect of thermal expansion and contraction, the bearing shaft pin to be disassembled will be reduced to a state that is more convenient for interference fit disassembly. After completing the operation, turn off the push switch 7 and the liquid nitrogen gun power device 1 in turn. The sliding ring 12 is rotated toward the side of the cryogenic sleeve 16, and the multiple sliding rods 13 diverge and expand away from one end of the sliding ring 12 until the contour formed by the outer edge of the sliding rod 13 that is opened outward can completely cover the bearing shaft pin to be disassembled. At this time, the fitting state between the bearing shaft pin to be disassembled and the graphene thermal conductive layer 18 can be released, and then the retractable fixing bracket 9 is removed from the buffer tube 6 through the retractable screw cap 10, and then the buffer tube 6 is removed from the integrally removable nitrogen storage module 4, and then the nitrogen storage tank 5 on the integrally removable nitrogen storage module 4 is removed, and then the integrally removable nitrogen storage module 4 is removed from the liquid nitrogen gun power device 1, and finally the lithium battery 3 is taken out. At this point, the disassembly is completed, and the components removed in each step are stored for easy carrying.

[0031] It should be understood that when used in this specification and the appended claims, the terms “include” and “comprises” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof;

[0032] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention; as used in the present specification and the appended claims, the singular forms "a", "an" and "the" are intended to include plural forms unless the context clearly indicates otherwise;

[0033] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

Claims

1. A device for disassembling and assembling bearing pins of transformer substation equipment using liquid nitrogen cooling technology, characterized in that: The invention comprises a liquid nitrogen gun power device (1), a control chamber (2), a lithium battery (3), an integrally detachable nitrogen storage module (4), a buffer tube (6) and a retractable fixed bracket (9), wherein the liquid nitrogen gun power device (1) is provided with a control chamber (2) and a lithium battery (3), wherein the lithium battery (3) is used to supply power to the liquid nitrogen gun power device (1), and the control chamber (2) is used to adjust the power outputted externally by the liquid nitrogen gun power device (1); the control chamber (2) is connected to the integrally detachable nitrogen storage module (4), and a nitrogen storage tank (5) is provided on the integrally detachable nitrogen storage module (4), wherein the nitrogen storage tank (5) is used to store liquid nitrogen; and the integrally detachable nitrogen storage module ( 4) A buffer tube (6) is installed at the other end, and the other end of the buffer tube (6) is connected to a retractable fixed bracket (9), and the other end of the retractable fixed bracket (9) is installed with a low-temperature sleeve (16) for contact heat exchange with the bearing shaft pin to be disassembled, and the buffer tube (6) is used to buffer the flow rate of buffer nitrogen from the nitrogen storage tank (5) to the low-temperature sleeve (16); the buffer tube (6) and the low-temperature sleeve (16) are connected, and a push switch (7) for switching the connection relationship is provided between the buffer tube (6) and the low-temperature sleeve (16), and the retractable fixed bracket (9) is used to adjust the contact position between the low-temperature sleeve (16) and the bearing shaft pin to be disassembled.

2. The device for disassembling and assembling bearing pins of transformer substation equipment by liquid nitrogen cooling technology according to claim 1, characterized in that: The telescopic fixed bracket (9) comprises a cylinder body, the cylinder body is detachably connected to the buffer tube (6) through a telescopic screw cap (10), and the two ends of the cylinder body are respectively connected to the buffer tube (6) and the low-temperature sleeve (16). The outer wall of the cylinder body is provided with a thread (11), and a sliding ring (12) is rotatably connected to the thread (11). A plurality of hinge seats are evenly distributed on the sliding ring (12), and each of the hinge seats is rotatably connected to a sliding rod (13). The sliding rod (13) is provided with a sliding groove (14) opened along the length direction. A fixing ring (15) is fixedly installed on the side of the cylinder body away from the telescopic screw cap (10), and a plurality of fork-shaped mounting seats (20) corresponding to the hinge seats are provided on the fixing ring (15), and each fork-shaped mounting seat (20) is provided with a limit pin (19) passing through the corresponding sliding groove (14), and each of the sliding rods (13) is provided with a mutually centripetal barb claw (17) at one end away from the hinge seat.

3. The device for disassembling and assembling bearing pins of transformer substation equipment by using liquid nitrogen cooling technology according to claim 1 is characterized in that: The outer layer of the nitrogen storage tank (5) is provided with a heat insulating material.

4. The device for disassembling and assembling bearing pins of transformer substation equipment by using liquid nitrogen cooling technology according to claim 1 is characterized in that: A temperature insulation layer (8) is provided on the outside of the buffer tube (6).

5. The device for disassembling and assembling the bearing pin of transformer equipment by liquid nitrogen cooling technology according to claim 2, characterized in that: The low-temperature sleeve (16) is a trumpet-shaped structure.

6. A device for disassembling and assembling bearing pins of transformer substation equipment using liquid nitrogen cooling technology according to claim 2 or 5, characterized in that: The low-temperature sleeve (16) is provided with a graphene heat-conducting layer (18) for increasing the contact area with the bearing pin to be disassembled.

7. The device for disassembling and assembling bearing pins of transformer substation equipment by using liquid nitrogen cooling technology according to claim 1, characterized in that: The control chamber (2) is multi-stage adjustable.

8. The device for disassembling and assembling bearing pins of transformer equipment by liquid nitrogen cooling technology according to claim 2 is characterized in that: An elastic bandage is arranged outside the plurality of sliding rods (13) for folding all the sliding rods (13) inwards.

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