Oil conservator for on-load tap changer of transformer and transformer
By designing elastic sealed rubber components and vertically placed cylindrical shells, the problems of high cost and large space occupancy of vegetable oil transformer oil storage cabinets are solved, and the effects of low cost, short lead time and space saving are achieved.
Patent Information
- Application Number
- CN202420972727.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-07
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-05-07
AI Technical Summary
In the prior art, the oil storage cabinet of vegetable oil transformers requires small capsule isolation, resulting in high costs, long lead time and excessive size of the oil storage cabinet, and existing oil storage cabinets usually occupy a large amount of horizontal space.
An oil storage cabinet including a housing and a sealing rubber element is designed. The housing is cylindrical, the sealing rubber element is elastic, which can increase space in the oil cavity, and the housing is placed vertically to save space.
It achieves low cost, short lead time and effectively reduces the horizontal space occupation of oil storage cabinets in the transformer, and is suitable for compact small and medium-sized transformers.
Smart Images
Figure CN222281741U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of electrical engineering, in particular to an oil storage cabinet for an on-load tap changer of a transformer and a transformer. Background Art
[0002] For mineral oil transformers, the expansion oil chamber (also called switch oil storage cabinet) of the on-load tapchanger is allowed to come into direct contact with the air, but for vegetable oil transformers, this is not allowed because the vegetable oil will oxidize rapidly after contact with the air, thereby producing impurities and causing breakdown of the internal insulation of the switch.
[0003] In the prior art, capsules are usually used to isolate vegetable oil and air in this situation. Since the switch oil chamber is very small, the switch oil storage cabinet and the matching capsule are particularly small. The small capsule is a special design for the factory. In addition, since the number of vegetable oil transformers is small, the corresponding small capsule demand is also small. These two factors lead to the high price of small capsules and long delivery time.
[0004] On the other hand, due to the limitations of the capsule processing technology, the smallest size of capsules that the factory can produce far exceeds the usage requirements of the switch oil chamber, resulting in the actual size of the switch oil storage cabinet being much larger than the theoretical requirement.
[0005] In addition, the oil storage tank in the prior art is usually oriented in a horizontal direction as a whole, and occupies more space in the horizontal direction. Utility Model Content
[0006] In view of this, the utility model aims to provide an oil conservator for an on-load tap changer of a transformer and a related transformer with a simple structure and low cost.
[0007] According to one aspect of the utility model, an oil conservator for an on-load tap changer of a transformer is provided, the oil conservator comprising: a shell, the shell comprising an outer wall and an inner space surrounded by the outer wall; and a sealing rubber element, the sealing rubber element being in a sheet shape, the sealing rubber element being located in the inner space, the peripheral portion of the sealing rubber element being sealingly mounted to the inner surface of the outer wall of the shell to divide the inner space into an oil chamber and an air chamber isolated from each other, the oil chamber being configured to communicate with the interior of an oil chamber of the on-load tap changer, and the air chamber being configured to communicate with the atmosphere, wherein the sealing rubber element has elasticity, so that when the oil in the oil chamber increases, the sealing rubber element can be elastically deformed toward the air chamber to increase the space of the oil chamber.
[0008] In an exemplary embodiment, the housing is in the shape of a hollow cylinder, and the sealing rubber element is in the shape of a flat disc when no force is applied.
[0009] In an exemplary embodiment, the outer wall of the shell includes a top wall, a bottom wall and a cylindrical peripheral wall, and the oil conservator further includes a support base for mounting the oil conservator, the support base being arranged below the bottom wall of the shell, so that when the oil conservator is in an installed state, the central axis of the shell is oriented in a vertical direction, and the air cavity is located above the oil cavity.
[0010] In an exemplary embodiment, the sealing rubber element is configured such that when the oil in the oil chamber increases, the sealing rubber element can be deformed into a hemispherical shape toward the air chamber.
[0011] In an exemplary embodiment, the oil conservator includes a mounting structure for mounting the sealing rubber element, the mounting structure including: a plurality of first connection holes provided along the peripheral portion of the sealing rubber element; a flange arranged on the inner surface of the outer wall of the housing, the bottom surface of the peripheral portion of the sealing rubber element abutting against the top surface of the flange, a plurality of second connection holes corresponding to the plurality of first connection holes being formed on the flange; and a plurality of bolts passing through the plurality of first connection holes and extending into the plurality of second connection holes for fastening to seal the sealing rubber element on the flange.
[0012] In an exemplary embodiment, the mounting structure further includes: a gasket mounted on a top surface of the peripheral portion of the sealing rubber element, the gasket being formed with a plurality of third connection holes corresponding to the plurality of first connection holes, wherein the plurality of bolts pass through the plurality of third connection holes, the plurality of first connection holes and extend into the plurality of second connection holes for fastening to seal the sealing rubber element on the flange.
[0013] In an exemplary embodiment, the gasket is composed of two semicircular arc parts, and the plurality of first connection holes and the plurality of third connection holes are through holes, and the plurality of second connection holes are blind holes.
[0014] In an exemplary embodiment, the oil storage cabinet further includes: an oil leakage detection device installed at a position on the shell corresponding to the air cavity, the oil leakage detection device being communicated with the air cavity to detect whether there is oil leaked from the oil cavity in the air cavity; and an oil level indicator installed at a position on the shell corresponding to the oil cavity, the oil level indicator being communicated with the oil cavity to indicate the height of the oil in the oil cavity.
[0015] In an exemplary embodiment, the height of the housing is 2 to 3 times the diameter of the housing.
[0016] According to another aspect of the utility model, a transformer is provided, comprising a transformer box and an oil conservator for an on-load tap changer of a transformer according to any one of the above embodiments, which is installed on the transformer box.
[0017] By means of the oil conservator for the on-load tap changer of the transformer and the transformer of the utility model, at least the following beneficial technical effects can be achieved.
[0018] First, the elastic sealing rubber elements of the oil conservator have lower costs and shorter delivery times.
[0019] Second, the cylindrical shell of the oil conservator is placed vertically, which can effectively reduce the horizontal space occupied by the oil conservator, which is very beneficial for small and medium-sized transformers where the space is already very compact. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so that those skilled in the art will be more aware of the above and other features and advantages of the present invention. In the accompanying drawings:
[0021] Figure 1 It is a perspective schematic diagram of an oil conservator for an on-load tap changer of a transformer according to an exemplary embodiment of the utility model, wherein a housing of the oil conservator is shown.
[0022] Figure 2 It is a three-dimensional schematic diagram of an oil conservator for an on-load tap changer of a transformer according to an exemplary embodiment of the utility model, wherein the shell of the oil conservator is omitted to more clearly show the internal structure of the oil conservator.
[0023] Figure 3 It is a three-dimensional schematic diagram of a sealing rubber element of an oil conservator for an on-load tap changer of a transformer according to an exemplary embodiment of the utility model in a normal non-deformed state.
[0024] Figure 4 It is a schematic exploded view of some components of an oil conservator for an on-load tap changer of a transformer according to an exemplary embodiment of the utility model, wherein the sealing rubber element is shown in a deformed state.
[0025] The reference numerals are as follows:
[0026] 10. Shell
[0027] 11. Oil cavity
[0028] 12. Air cavity
[0029] 13. Top wall
[0030] 14. Bottom wall
[0031] 15. Flange
[0032] 16. Second connection hole
[0033] 17. Washer
[0034] 18. The third connection hole
[0035] 20. Sealing rubber components
[0036] 21. Peripheral part
[0037] 22. First connection hole
[0038] 30. Support seat
[0039] 31. Base
[0040] 32. Column
[0041] 33. Strengthening ribs
[0042] 40. Oil leakage detection device
[0043] 50. Oil level indicator
[0044] 60. Butterfly valve
[0045] 61. YouTube
[0046] 62. Vacuum control valve
[0047] 63. Ventilation pipe
[0048] 64. Inspection hole DETAILED DESCRIPTION
[0049] In order to make the purpose, technical scheme and advantages of the utility model clearer, the utility model is further described in detail with reference to the following embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. The nouns and pronouns about people in this patent application are not limited to specific genders.
[0050] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form as well.
[0051] First, please refer to Figure 1 and Figure 2 , respectively show a three-dimensional schematic diagram of an oil conservator for an on-load tap changer of a transformer according to an exemplary embodiment of the utility model. Figure 2 The shell of the oil conservator is omitted in the figure to more clearly show the internal structure of the oil conservator. The oil conservator mainly includes components such as a shell 10 and a sealing rubber element 20. The shell 10 includes an outer wall and an inner space surrounded by the outer wall.
[0052] Reference Figure 3 , the sealing rubber element 20 is in sheet form. Figure 2 The sealing rubber element 20 is located in the internal space of the housing 10, and the peripheral portion 21 of the sealing rubber element 20 is sealingly mounted on the inner surface of the outer wall of the housing 10 to divide the internal space into an oil chamber 11 and an air chamber 12 which are isolated from each other. The oil chamber 11 is configured to communicate with the inside of the oil chamber of the on-load tap changer, and the air chamber 12 is configured to communicate with the atmosphere. It is explained here that the air chamber 12 can be connected to the desiccant through the vent pipe 63, and the desiccant is communicated with the atmosphere, and the desiccant is used to filter moisture in the atmosphere.
[0053] The sealing rubber element 20 is elastic, so that when the transformer is working, when the temperature of the oil inside the oil chamber of the on-load tap changer increases, causing the oil to expand and thus increasing the oil in the oil cavity 11, the sealing rubber element 20 can be elastically deformed toward the air cavity 12 to increase the space of the oil cavity 11, thereby being able to receive more oil. Figure 2 2 shows the sealing rubber element 20 in a deformed state. Of course, when the temperature of the oil in the oil chamber of the on-load tap changer drops, the oil shrinks, so that the oil in the oil chamber 11 decreases, and the sealing rubber element 20 can return to its original plane state.
[0054] According to the solution of the utility model, the vegetable oil is isolated from the air by using the elastic sealing rubber element 20. At the same time, the size of the sealing rubber element can match the theoretical size of the oil storage cabinet, so that a smaller oil storage cabinet can be designed according to actual needs.
[0055] Reference Figure 1 The housing 10 is in the shape of a hollow cylinder. Figure 3 The sealing rubber element 20 is in a flat disc shape when not under stress. Considering the space saving, the central axis of the shell of the oil storage cabinet is oriented in the vertical direction in the utility model.
[0056] Specifically, refer to Figure 1 and Figure 2The outer wall of the housing 10 may include a top wall 13, a bottom wall 14 and a cylindrical peripheral wall, and the oil conservator further includes a support base 30 for mounting the oil conservator, the support base 30 being arranged below the bottom wall 14 of the housing 10, so that when the oil conservator is in the installed state, the central axis of the cylindrical housing 10 is oriented in the vertical direction, and the air cavity 12 is located above the oil cavity 11. Preferably, the height of the housing 10 is 2 to 3 times the diameter of the housing 10. For transformers, the horizontal dimensions are generally restricted, and the height dimensions are less restricted. Therefore, when the cylinder of the oil conservator is arranged vertically, the horizontal space of the transformer can be saved, which provides a compact transformer.
[0057] Reference Figure 2 The support base 30 may include a base 31, a column 32 mounted on the base 31, and a plurality of reinforcing ribs 33. The support base 30 may be mounted on a box cover of a transformer, for example.
[0058] Reference Figure 4 The sealing rubber element 20 can be constructed such that when the oil in the oil chamber 11 increases, the sealing rubber element 20 can be deformed into a hemispherical shape toward the air chamber 12. It is understandable that the sealing rubber element 20 can also be constructed to have elasticity on both sides, and can be deformed into a hemispherical shape toward the air chamber 12 when subjected to force, and can also be deformed into a hemispherical shape toward the oil chamber 11 when subjected to an opposite force. The diameter of the center of the hemispherical shape can be in the range of 15 cm to 20 cm, that is, the moving distance of the elastic deformation of the central area of the sealing rubber element 20 on one side can be in the range of 15 cm to 20 cm. If deformation can be performed in both directions, the moving distance of the deformation can be in the range of 30 cm to 40 cm.
[0059] Reference Figure 4 The oil storage cabinet may include a mounting structure for mounting the sealing rubber element 20, the mounting structure including: a plurality of first connection holes 22 arranged along the peripheral portion 21 of the sealing rubber element 20; a flange 15 arranged on the inner surface of the outer wall of the housing 10, the flange 15 may be welded to the inner surface of the outer wall of the housing 10, the bottom surface of the peripheral portion 21 of the sealing rubber element 20 abuts against the top surface of the flange 15, and a plurality of second connection holes 16 corresponding to the plurality of first connection holes 22 are formed on the flange 15; and a plurality of bolts ( Figure 4 The sealing rubber element 20 is installed on the flange 15 in a sealing manner by passing through the plurality of first connecting holes 22 and extending into the plurality of second connecting holes 16 for fastening.
[0060] Still refer to Figure 4The mounting structure may further include: a gasket 17 mounted on the top surface of the peripheral portion 21 of the sealing rubber element 20, and a plurality of third connection holes 18 corresponding to the plurality of first connection holes 22 are formed on the gasket 17, wherein the plurality of bolts pass through the plurality of third connection holes 18, the plurality of first connection holes 22 and extend into the plurality of second connection holes 16 for fastening to seal the sealing rubber element 20 on the flange 15.
[0061] Still refer to Figure 4 The gasket 17 may be composed of two semicircular ring parts, and the plurality of first connecting holes 22 and the plurality of third connecting holes 18 are all through holes, and the plurality of second connecting holes 16 are all blind holes.
[0062] Reference Figure 1 The oil storage cabinet may further include an oil leakage detection device 40, such as an oil leakage detection relay. The oil leakage detection device is installed at a position on the housing 10 corresponding to the air cavity 12. The oil leakage detection device 40 is connected to the air cavity 12 to detect whether there is oil leaking from the oil cavity 11 in the air cavity 12. If the sealing rubber element is damaged, oil leakage may occur. Vegetable oil is easily oxidized, and oxidation may produce impurities, which may lead to the risk of discharge in the transformer. The oil leakage detection device can monitor the risk of oil leakage and alarm when oil leakage occurs. The oil leakage detection device 40 may be, for example, a device including a float, and when oil leakage occurs, the float floats up.
[0063] The oil storage cabinet may also include an oil level indicator 50, which is installed at a position corresponding to the oil chamber 11 on the housing 10. The oil level indicator 50 is connected to the oil chamber 11 to indicate the height of the oil in the oil chamber 11. It should be noted that the oil level indicator 50 uses a floating ball to float on the oil surface, and a transmission rod connects the floating ball and the dial. The dial is fixed. When the floating ball rises or falls, the angle between the transmission rod and the horizontal plane will change. This change is reflected on the dial through the transmission of the gear. The change of the oil level can be converted into the change of the oil temperature through a specific conversion relationship. Therefore, the unit of the scale on the dial of the oil level indicator 50 can be ℃. When the oil temperature is too high or too low, the oil level indicator 50 can alarm to indicate that the transformer is in an abnormal state.
[0064] The oil conservator may further include a butterfly valve 60 installed at the bottom wall 14 of the housing 10, the butterfly valve 60 connects the oil chamber with the oil chamber of the on-load tap changer to supply oil to the on-load tap changer. The oil conservator may further include an oil pipe 61 installed at the bottom wall 14 of the housing 10, the oil pipe 61 is used for oil filling and oil discharge. The oil conservator may further include a vacuum control valve 62 and a vent pipe 63, the vent pipe 63 may be connected to the atmosphere via a desiccant, and the vent pipe 63 and the vacuum control valve 62 may be used for vacuuming during oil filling. The oil conservator may further include an inspection hole 64 installed at a position on the housing 10 corresponding to the oil chamber 11, for checking the state of the oil chamber 11 of the oil conservator.
[0065] The utility model also provides a transformer, which comprises a transformer box and an oil storage cabinet installed on the transformer box and used for an on-load tap changer of the transformer.
[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. An oil conservator for an on-load tap changer of a transformer, characterized in that: The oil storage tank comprises: A housing (10), the housing (10) comprising an outer wall and an inner space surrounded by the outer wall; and a sealing rubber element (20) in the form of a sheet, the sealing rubber element (20) being located in the internal space, the peripheral portion (21) of the sealing rubber element (20) being sealingly mounted on the inner surface of the outer wall of the housing (10) so as to divide the internal space into an oil chamber (11) and an air chamber (12) which are isolated from each other, the oil chamber (11) being configured to communicate with the interior of the oil chamber of the on-load tap changer, and the air chamber (12) being configured to communicate with the atmosphere, The sealing rubber element (20) is elastic, so that when the oil in the oil chamber (11) increases, the sealing rubber element (20) can be elastically deformed in the direction of the air chamber (12) to increase the space of the oil chamber (11).
2. The oil conservator for the on-load tap changer of a transformer according to claim 1, characterized in that: The housing (10) is in the shape of a hollow cylinder, and the sealing rubber element (20) is in the shape of a flat disc when no force is applied.
3. The oil conservator for the on-load tap changer of a transformer according to claim 2, characterized in that: The outer wall of the shell (10) comprises a top wall (13), a bottom wall (14) and a cylindrical peripheral wall, and the oil conservator further comprises a support base (30) for mounting the oil conservator, the support base (30) being arranged below the bottom wall (14) of the shell (10), so that when the oil conservator is in an installed state, the central axis of the shell (10) is oriented in a vertical direction, and the air cavity (12) is located above the oil cavity (11).
4. The oil conservator for an on-load tap changer of a transformer according to claim 1, characterized in that: The sealing rubber element (20) is configured such that when the oil in the oil chamber (11) increases, the sealing rubber element (20) can be deformed into a hemispherical shape toward the air chamber (12).
5. The oil conservator for an on-load tap changer of a transformer according to any one of claims 1 to 4, characterized in that: The oil storage cabinet comprises a mounting structure for mounting the sealing rubber element (20), the mounting structure comprising: a plurality of first connection holes (22) arranged along the peripheral portion (21) of the sealing rubber element (20); a flange (15) arranged on the inner surface of the outer wall of the housing (10), the bottom surface of the peripheral portion (21) of the sealing rubber element (20) abutting against the top surface of the flange (15), and a plurality of second connection holes (16) corresponding to the plurality of first connection holes (22) being formed on the flange (15); and A plurality of bolts pass through the plurality of first connection holes (22) and extend into the plurality of second connection holes (16) for fastening to seal the sealing rubber element (20) on the flange (15).
6. The oil conservator for the on-load tap changer of the transformer according to claim 5, characterized in that: The mounting structure further comprises: a gasket (17) mounted on the top surface of the peripheral portion (21) of the sealing rubber element (20), wherein the gasket (17) is formed with a plurality of third connection holes (18) corresponding to the plurality of first connection holes (22), wherein the plurality of bolts pass through the plurality of third connection holes (18), the plurality of first connection holes (22) and extend into the plurality of second connection holes (16) for fastening, thereby sealingly mounting the sealing rubber element (20) on the flange (15).
7. The oil conservator for the on-load tap changer of a transformer according to claim 6, characterized in that: The gasket (17) is composed of two semicircular arc parts, and the plurality of first connection holes (22) and the plurality of third connection holes (18) are all through holes, and the plurality of second connection holes (16) are all blind holes.
8. The oil conservator for an on-load tap changer of a transformer according to any one of claims 1 to 4, characterized in that: The oil storage tank also includes: an oil leakage detection device (40) mounted on the housing (10) at a position corresponding to the air cavity (12), the oil leakage detection device (40) being in communication with the air cavity (12) to detect whether oil leaked from the oil cavity (11) is present in the air cavity (12); and An oil level indicator (50) is mounted on the housing (10) at a position corresponding to the oil chamber (11); the oil level indicator (50) is in communication with the oil chamber (11) to indicate the height of the oil in the oil chamber (11).
9. The oil conservator for an on-load tap changer of a transformer according to claim 2 or 3, characterized in that: The height of the housing (10) is 2 to 3 times the diameter of the housing (10).
10. A transformer, characterized in that The transformer comprises a transformer box and an oil conservator for an on-load tap changer for a transformer according to any one of claims 1 to 9, which is mounted on the transformer box.