Expansion connection assembly and expansion connection method for oil-water cooler for transformer

Abstract

The present invention discloses an expansion connection assembly and an expansion connection method for an oil-water cooler for a transformer. The present invention relates to the technical field of transformers, and comprises a tube body, wherein the upper and lower ends of the tube body are respectively provided with an upper flange and a lower flange, and a telescopic pipe joint is provided in the middle of the tube body, wherein a plurality of mounting holes are equidistantly provided on the upper flange and the lower flange, and three telescopic adjustment parts are equidistantly provided between the outer edges of the upper flange and the lower flange. In the expansion connection assembly and the expansion connection method for the oil-water cooler for a transformer, when the sealing gasket is deformed and loses its sealing function, the leaked oil and water will first enter the annular cavity through the through groove, wet the water-expandable strip, and cause the water-expandable strip to expand. After the water-expandable strip expands, it will drive the annular gasket strip to move upward, so that the sealing gasket is tightly attached to the flange of the transformer or oil-water cooler interface, thereby playing a sealing role and preventing the oil and water from leaking.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, in particular to an expansion connection assembly and an expansion connection method for an oil-water cooler for a transformer. Background Art

[0002] In power systems, transformers are core components, and their stable operation is directly related to the reliability and efficiency of the entire system. To ensure the proper functioning of transformers, cooling systems are typically required to maintain their operating temperature. Water cooling systems are a widely used heat dissipation solution, absorbing heat from the transformer and surrounding equipment through circulating cooling water, achieving efficient heat dissipation. This water cooling system not only effectively reduces equipment temperature but also prevents performance degradation or damage caused by overheating.

[0003] However, in practical applications, water-cooling systems face severe challenges from temperature fluctuations and material thermal expansion. The materials of transformers and water-cooling equipment typically have different coefficients of thermal expansion. Temperature fluctuations can lead to differences in the amount of expansion between the two, causing the connection components to loosen or deform, or even causing seal failure and cooling water leakage. Traditional expansion joints typically use rubber seals or other elastic seals to cope with this thermal expansion effect. However, after long-term use, the rubber material will age and deform, seriously reducing the sealing performance. In addition, when the volume change caused by temperature changes is too large, traditional expansion joints may not be able to withstand the excessive stress, resulting in damage to the connection, which in turn affects the normal operation of the water-cooling system and the safety of the transformer.

[0004] Therefore, it is necessary to develop an expansion connection assembly for an oil-water cooler for a transformer with good sealing effect and long service life. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the present invention provides an expansion connection assembly and an expansion connection method for an oil-water cooler for a transformer, which solve the problems of poor sealing effect and short service life of traditional expansion connection assemblies.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: an expansion connection assembly for an oil-water cooler for a transformer, comprising a tube body, an upper flange and a lower flange are respectively provided at the upper and lower ends of the tube body, and a telescopic pipe joint is provided in the middle of the tube body, a plurality of mounting holes are equidistantly provided on the upper flange and the lower flange, three telescopic adjustment parts are equidistantly provided between the outer edges of the upper flange and the lower flange, a gear drive part for driving the telescopic adjustment part is provided at the periphery of the upper flange, a limiting part is provided between each of the telescopic adjustment parts, and a seal is provided on the end faces of the upper flange and the lower flange.

[0007] The sealing member includes an annular groove arranged on the end face of the upper flange, an annular gasket matching its inner diameter is longitudinally slidingly arranged in the annular groove, a sealing gasket is arranged on the upper side of the annular gasket, an annular cavity is arranged inside the upper flange at a position below the annular groove, an annular raised strip is arranged on the side of the annular gasket away from the sealing gasket, the side of the raised strip away from the annular gasket slides longitudinally through the inner lower side of the annular groove, and is connected to a water-expanding strip in the annular cavity, the side of the water-expanding strip away from the raised strip is fixedly arranged on the inner lower side of the annular cavity, the sealing gasket, the annular gasket and the raised strip are all provided with through grooves with the same central axis, and the through grooves extend to the upper side of the sealing gasket and the lower side of the raised strip respectively.

[0008] Preferably, a cavity for the water-swellable strip to expand is reserved between the side of the water-swellable strip close to the raised strip and the inner top side of the annular cavity.

[0009] Preferably, the sealing gasket is made of elastic material.

[0010] Preferably, the telescopic adjustment part includes three upper protrusions equidistantly arranged on the outer edge of the upper flange and three lower protrusions on the outer edge of the lower flange. The three upper protrusions correspond to the three lower protrusions one by one, and a driving gear is rotatably arranged on the upper part of the upper protrusion. The lower end of the driving gear is located below the upper protrusion and is connected to a screw. The lower end of the screw slides longitudinally through the upper part of the upper flange corresponding to it, and the outside of the screw is located below the lower protrusion and is screwed with a nut sleeve through a thread. The nut sleeves on the three screws are connected by three arc-shaped limit rods.

[0011] Preferably, the limiting part includes an annular plate, three limiting sleeves are equidistantly arranged on the annular plate, the three limiting sleeves are longitudinally slidably sleeved on the three screw rods respectively, a movable seat is provided on one side of one of the limiting sleeves, and the limiting part also includes a fixed seat provided on one side of one of the nut sleeves, a knob is rotatably provided at the bottom of the fixed seat, the upper end of the knob is located at the upper position of the fixed seat and is connected to a bolt rod, and the movable seat is screwed onto the bolt rod through a thread.

[0012] Preferably, the gear drive part includes a ring body, an internal gear is provided at the inner upper edge of the ring body, the internal gear is engaged with the three driving gears respectively, and a flange is provided on the inner side of the ring body below the internal gear, and the three upper protrusions are provided with a limiting groove adapted to the flange on the side away from the upper flange, and the flange is slidably embedded in the limiting grooves on the three upper protrusions.

[0013] A method for connecting an expansion connection assembly of an oil-water cooler for a transformer includes connecting a transformer and an oil-water cooler using the expansion connection assembly of the oil-water cooler for the transformer. The connection method is to connect an upper flange and a lower flange at both ends of a tube body to an interface flange of the transformer and an interface flange of the oil-water cooler respectively by screws.

[0014] The present invention provides an expansion connection assembly and an expansion connection method for an oil-water cooler for a transformer, which have the following beneficial effects compared with the prior art:

[0015] 1. The expansion connection assembly and expansion connection method of the transformer oil-water cooler: when the sealing gasket is deformed and loses its sealing function, the leaked oil and water will first enter the annular cavity through the through groove, moistening the water expansion strip, causing the water expansion strip to expand. The expansion of the water expansion strip will drive the annular gasket to move upward, so that the sealing gasket is tightly attached to the flange of the transformer or oil-water cooler interface, thereby playing a sealing role, preventing oil and water from leaking, and ensuring the stable operation of the water cooling system.

[0016] 2. The expansion connection assembly and expansion connection method of the transformer oil-water cooler, by providing a telescopic adjustment portion, can adjust the length of the telescopic tube section, thereby adjusting its telescopic degree, to prevent excessive stress caused by volume changes due to temperature differences, which could damage the telescopic tube section. Furthermore, when adjusting the telescopic tube section, only the ring body needs to be rotated to drive the three screws to rotate simultaneously, without having to rotate the three screws one by one. This saves adjustment time, enhances the thermal expansion adaptability of the device, ensures the reliability of the water cooling equipment under different temperature conditions, and extends its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 It is a structural schematic diagram of the telescopic adjustment part of the present invention;

[0019] Figure 3 This is a schematic structural diagram of the upper flange of the present invention;

[0020] Figure 4 It is a structural schematic diagram of the sealing member of the present invention;

[0021] Figure 5 Schematic diagram of the structure of the limiting part of the present invention;

[0022] Figure 6 Schematic diagram of the structure of the gear drive unit of the present invention.

[0023] In the figure: 1. Tube body; 2. Upper flange; 3. Lower flange; 4. Telescopic pipe joint; 5. Mounting hole; 6. Telescopic adjustment part; 61. Upper protrusion; 62. Lower protrusion; 63. Driving gear; 64. Screw; 65. Nut sleeve; 66. Limit rod; 67. Limit groove; 7. Gear driving part; 71. Ring body; 72. Internal gear; 73. Flange; 8. Limit part; 81. Ring plate; 82. Limit sleeve; 83. Moving seat; 84. Fixed seat; 85. Knob; 86. Bolt rod; 9. Sealing part; 91. Annular groove; 92. Annular gasket; 93. Sealing gasket; 94. Annular cavity; 95. Raised strip; 96. Water-expanding strip; 97. Through groove. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0025] See also Figures 1-6 , the present invention provides three technical solutions:

[0026] Example 1

[0027] See also Figure 1 In an embodiment of the present invention, an expansion connection assembly for an oil-water cooler for a transformer includes a tube body 1, an upper flange 2 and a lower flange 3 are respectively provided at the upper and lower ends of the tube body 1, and a telescopic pipe joint 4 is provided in the middle of the tube body 1, a plurality of mounting holes 5 are equidistantly provided on the upper flange 2 and the lower flange 3, three telescopic adjustment parts 6 are equidistantly provided between the outer edges of the upper flange 2 and the lower flange 3, a gear driving part 7 for driving the telescopic adjustment part 6 is provided at the periphery of the upper flange 2, a limiting part 8 is provided between each telescopic adjustment part 6, and a sealing member 9 is provided on the end surface of the upper flange 2 and the lower flange 3.

[0028] See also Figure 3-Figure 4In the embodiment of the present invention, the sealing member 9 includes an annular groove 91 provided on the end face of the upper flange 2, and an annular gasket 92 adapted to its inner diameter is longitudinally slidably provided in the annular groove 91, and a sealing gasket 93 is provided on the upper side of the annular gasket 92. An annular cavity 94 is provided inside the upper flange 2 at a position below the annular groove 91, and an annular raised strip 95 is provided on the side of the annular gasket 92 away from the sealing gasket 93. The side of the raised strip 95 away from the annular gasket 92 slides longitudinally through the inner lower side of the annular groove 91, and is connected to a water-expanding strip 96 in the annular cavity 94, and the side of the water-expanding strip 96 away from the raised strip 95 is fixedly provided on the inner lower side of the annular cavity 94. The sealing gasket 93, the annular gasket 92 and the raised strip 95 are all provided with a through groove 97 with the same central axis, and the through groove 97 extends to the upper side of the sealing gasket 93 and the lower side of the raised strip 95 respectively.

[0029] In the above scheme: the upper flange 2 and the lower flange 3 are respectively installed on the interface flanges of the transformer and the oil-water cooler by screws to complete the assembly of the expansion connection assembly. During assembly, the sealing gasket 93 on the annular gasket 92 will be tightly attached to the interface flange of the transformer or the oil-water cooler to play a sealing role. If the sealing gasket 93 is deformed and does not fit the interface flange of the transformer or the oil-water cooler, the oil and water will leak at this time. When leaking, they will first enter the through groove 97 and enter the water-expansion strip 96 through the through groove 97 to moisten the water-expansion strip 96. After being moistened, the water-expansion strip 96 will expand, and then the raised strip 95 will drive the annular gasket 92 to move upward, and the sealing gasket 93 on the annular gasket 92 will be tightly attached to the interface flange of the transformer and the oil-water cooler to prevent the outflow of oil and water, thereby strengthening the sealing effect.

[0030] For further information, see Figure 4 In the embodiment of the present invention, a cavity for the water-expandable strip 96 to expand is reserved between the side of the water-expandable strip 96 close to the raised strip 95 and the inner top side of the annular cavity 94. When the water-expandable strip 96 expands, it can move within the cavity, thereby enabling the raised strip 95 to drive the annular gasket strip 92 to move upward to achieve sealing operation.

[0031] For further information, see Figure 4 In the embodiment of the present invention, the sealing gasket 93 is made of elastic material, which can improve the sealing effect.

[0032] The second embodiment differs from the first embodiment in that:

[0033] See also Figure 2In this embodiment of the present invention, the telescopic adjustment portion 6 includes three upper protrusions 61 equidistantly arranged on the outer edge of the upper flange 2 and three lower protrusions 62 on the outer edge of the lower flange 3. The three upper protrusions 61 correspond to the three lower protrusions 62 one by one, and a driving gear 63 is rotatably provided on the upper part of the upper protrusion 61. The lower end of the driving gear 63 is located below the upper protrusion 61 and is connected to a screw 64. The lower end of the screw 64 slides longitudinally through the upper part of the corresponding upper flange 2, and the outer part of the screw 64 is located below the lower protrusion 62 and is screwed with a nut sleeve 65 by thread. The nut sleeves 65 on the three screws 64 are connected by three arc-shaped limit rods 66.

[0034] See also Figure 1 and Figure 6 In this embodiment of the present invention, the gear driving portion 7 includes a ring body 71, and an internal gear 72 is provided at the inner upper edge of the ring body 71. The internal gears 72 are respectively engaged with the three driving gears 63, and a flange 73 is provided on the inner side of the ring body 71 below the internal gear 72. The three upper protrusions 61 are provided with a limiting groove 67 adapted to the flange 73 on the side away from the upper flange 2. The flange 73 is slidably embedded in the limiting grooves 67 on the three upper protrusions 61.

[0035] In the above scheme: by rotating the ring body 71, the internal gear 72 inside the ring body 71 will drive the various drive gears 63 to rotate, and the drive gear 63 will drive the screw 64 to rotate, and the screw 64 will drive the nut sleeve 65 to move, causing it to move upward, and the nut sleeve 65 will push the lower protrusion 62 to slide on the screw 64, thereby driving the lower flange 3 at the lower end of the tube body 1 to move upward, causing the telescopic tube section 4 to contract and adjust the length of the telescopic tube section 4. After adjustment, stop rotating the ring body 71.

[0036] The third embodiment differs from the first embodiment in that:

[0037] See also Figure 1 and Figure 5 In the embodiment of the present invention, the limiting portion 8 includes an annular plate 81, on which three limiting sleeves 82 are equidistantly arranged. The three limiting sleeves 82 are respectively longitudinally slidably sleeved on the three screw rods 64, and a movable seat 83 is provided on one side of one of the limiting sleeves 82. The limiting portion 8 also includes a fixed seat 84 provided on one side of one of the nut sleeves 65. A knob 85 is rotatably provided at the bottom of the fixed seat 84. The upper end of the knob 85 is located at the upper position of the fixed seat 84 and is connected to a bolt rod 86. The movable seat 83 is screwed onto the bolt rod 86 through a thread.

[0038] In the above scheme, by rotating the knob 85, the bolt rod 86 is rotated, the bolt rod 86 drives the movable seat 83 to move, and the movable seat 83 drives the annular plate 81 to move, thereby adjusting the distance between the annular plate 81 and the lower flange 3. This distance is the telescopic distance limit value, thereby controlling the telescopic distance of the telescopic tube section 4 and preventing the telescopic tube section 4 from being damaged due to excessive force.

[0039] A method for connecting an expansion connection assembly of an oil-water cooler for a transformer includes connecting a transformer and an oil-water cooler using the expansion connection assembly of the oil-water cooler for the transformer. The connection method is to connect an upper flange 2 and a lower flange 3 at both ends of a tube body 1 to an interface flange of the transformer and an interface flange of the oil-water cooler, respectively, by screws.

[0040] Working principle: Use screws to install the upper flange 2 and lower flange 3 to the interface flanges of the transformer and oil-water cooler respectively to complete the assembly of the expansion joint assembly;

[0041] During assembly, the sealing gasket 93 on the annular gasket strip 92 will be in close contact with the interface flange of the transformer or the oil-water cooler to play a sealing role. If the sealing gasket 93 is deformed and does not fit the interface flange of the transformer or the oil-water cooler, oil and water will leak out. When leaking, the leaked gasket will first enter the through groove 97, and then enter the water-expanding strip 96 through the through groove 97, moistening the water-expanding strip 96. When the water-expanding strip 96 is moistened, it will expand, and then the raised strip 95 will drive the annular gasket strip 92 to move upward. The sealing gasket 93 on the annular gasket strip 92 will be in close contact with the interface flange of the transformer and the oil-water cooler, preventing the outflow of oil and water, thereby strengthening the sealing effect.

[0042] By rotating the ring body 71, the internal gear 72 inside the ring body 71 drives the various driving gears 63 to rotate, and the driving gears 63 drive the screw 64 to rotate, which in turn drives the nut sleeve 65 to move upward. The nut sleeve 65 pushes the lower protrusion 62 to slide upward on the screw 64, thereby driving the lower flange 3 at the lower end of the tube body 1 to move upward, causing the telescopic tube section 4 to contract and adjust the length of the telescopic tube section 4. After adjustment, stop rotating the ring body 71.

[0043] Then, by turning the knob 85, the bolt rod 86 is rotated, the bolt rod 86 drives the movable seat 83 to move, and the movable seat 83 drives the annular plate 81 to move, thereby adjusting the distance between the annular plate 81 and the lower flange 3. This distance is the telescopic distance limit value, thereby controlling the telescopic distance of the telescopic tube section 4 and preventing the telescopic tube section 4 from being damaged due to excessive force.

[0044] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

Claims

1. An expansion connection assembly for an oil-water cooler for a transformer, comprising a tube body (1), wherein the upper and lower ends of the tube body (1) are respectively provided with an upper flange (2) and a lower flange (3), and a telescopic tube joint (4) is provided in the middle of the tube body (1), and a plurality of mounting holes (5) are equidistantly provided on the upper flange (2) and the lower flange (3), wherein the expansion connection assembly is characterized in that: Three telescopic adjustment parts (6) are equidistantly arranged between the outer edges of the upper flange (2) and the lower flange (3); a gear driving part (7) for driving the telescopic adjustment part (6) is arranged at the periphery of the upper flange (2); a limiting part (8) is arranged between each of the telescopic adjustment parts (6); and a sealing member (9) is arranged on the end surfaces of the upper flange (2) and the lower flange (3); The sealing member (9) comprises an annular groove (91) provided on the end face of the upper flange (2), an annular gasket (92) adapted to the inner diameter of the annular groove (91) is longitudinally slidably provided, a sealing gasket (93) is provided on the upper side of the annular gasket (92), an annular cavity (94) is provided in the interior of the upper flange (2) at a position below the annular groove (91), an annular raised strip (95) is provided on the side of the annular gasket (92) away from the sealing gasket (93), and the raised strip (95) is away from the annular gasket. One side of the strip (92) slides longitudinally through the inner lower side of the annular groove (91), and is connected to a water-expandable strip (96) located in the annular cavity (94), and the side of the water-expandable strip (96) away from the raised strip (95) is fixedly arranged on the inner lower side of the annular cavity (94), and the sealing gasket (93), the annular gasket (92) and the raised strip (95) are all provided with a through groove (97) with the same central axis, and the through groove (97) extends to the upper side of the sealing gasket (93) and the lower side of the raised strip (95) respectively; A cavity for the water-expandable strip (96) to expand is left between the side of the water-expandable strip (96) close to the raised strip (95) and the inner top side of the annular cavity (94).

2. The expansion connection assembly of an oil-water cooler for a transformer according to claim 1, characterized in that: The sealing gasket (93) is made of elastic material.

3. The expansion connection assembly of an oil-water cooler for a transformer according to claim 1, characterized in that: The telescopic adjustment portion (6) comprises three upper protrusions (61) equidistantly arranged on the outer edge of the upper flange (2) and three lower protrusions (62) on the outer edge of the lower flange (3). The three upper protrusions (61) correspond to the three lower protrusions (62) one by one, and a driving gear (63) is rotatably arranged on the upper part of the upper protrusion (61). The lower end of the driving gear (63) is connected to a screw rod (64) at a position below the upper protrusion (61). The lower end of the screw rod (64) slides longitudinally through the upper part of the upper flange (2) corresponding thereto, and the outer part of the screw rod (64) is located at a position below the lower protrusion (62) and is screwed with a nut sleeve (65) through a thread. The nut sleeves (65) on the three screw rods (64) are connected by three arc-shaped limit rods (66).

4. The expansion connection assembly of the transformer oil-water cooler according to claim 3, characterized in that: The limiting portion (8) includes an annular plate (81), three limiting sleeves (82) are equidistantly arranged on the annular plate (81), and the three limiting sleeves (82) are respectively longitudinally slidably sleeved on the three screw rods (64), and a movable seat (83) is provided on one side of one of the limiting sleeves (82). The limiting portion (8) also includes a fixed seat (84) provided on one side of one of the nut sleeves (65), and a knob (85) is rotatably provided at the bottom of the fixed seat (84). The upper end of the knob (85) is located at the upper position of the fixed seat (84) and is connected to a bolt rod (86), and the movable seat (83) is screwed to the bolt rod (86) through a thread.

5. The expansion connection assembly of the transformer oil-water cooler according to claim 3, characterized in that: The gear drive portion (7) includes a ring body (71), an inner gear (72) is provided at the inner upper edge of the ring body (71), the inner gear (72) is meshed with the three driving gears (63) respectively, and a flange (73) is provided on the inner side of the ring body (71) below the inner gear (72), and a limiting groove (67) adapted to the flange (73) is provided on the side of the three upper protrusions (61) away from the upper flange (2), and the flange (73) is slidably embedded in the limiting grooves (67) on the three upper protrusions (61).

6. A method for connecting an expansion connection assembly of an oil-water cooler for a transformer, characterized in that: The invention comprises using the expansion connection assembly of the transformer oil-water cooler according to any one of claims 1 to 5 to connect the transformer and the oil-water cooler, wherein the connection method is to connect the upper flange (2) and the lower flange (3) at both ends of the tube body (1) to the interface flange of the transformer and the interface flange of the oil-water cooler respectively by screws.

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