Auxiliary oil tank structure for split type on-load tap-changer

Abstract

The invention provides an auxiliary oil tank structure for a split type on-load tap-changer. The auxiliary oil tank structure comprises an auxiliary oil tank, reinforcing ribs, an oil chamber barrel and a pressure relief valve. The auxiliary oil tank comprises an oil tank body and a tank body top cover, and the tank body top cover is located above the oil tank body and fixed through bolts. The oil chamber barrel is located in the auxiliary oil tank and fixed to the tank body top cover through bolts. And the pressure relief valve is positioned above the oil chamber barrel. Compared with an existing split type on-load tap-changer auxiliary oil tank, the auxiliary oil tank has the advantages that the reinforcing rib structure of the auxiliary oil tank is optimized, the transverse and vertical reinforcing ribs, the right-angle base reinforcing ribs and the like are additionally arranged, the tensile strength and the bending strength of the auxiliary oil tank are effectively improved, deformation of a tank body shell in an arc fault can be reduced, and the anti-explosion performance of the auxiliary oil tank is improved.

Description

Technical Field

[0001] The invention relates to the field of explosion-proof of electric power equipment, and in particular to an auxiliary oil tank structure for a split-type on-load tap changer. Background Art

[0002] The on-load tap changer of the UHV converter transformer adjusts the winding ratio to compensate for voltage fluctuations, improve power quality and stabilize DC transmission power, but it includes many complex and precise components. Once the switching time error of the components exceeds a certain range, it may cause the tap changer to fail, a continuous arc to be generated between the contacts, and an arc discharge of hundreds of kiloamperes inside the switch, with a discharge energy of several megajoules or even tens of megajoules. Faced with such a huge amount of energy, the pressure release valve cannot fully guarantee that the pressure is released in time, which may cause the converter transformer to explode and catch fire in severe cases.

[0003] In order to reduce the loss in the event of an accident, the split-type on-load tap-changer places the switching core part that is prone to arc faults separately in an oil tank, and realizes electrical connection with other parts through the internal casing. This oil tank is called the "subsidiary oil tank" of the split-type on-load tap-changer. Before the split-type on-load tap-changer is put into use, multiple large-capacity short-circuit arc tests will be carried out to verify the reliability of the oil tank structure. In order to strengthen the structural strength of the auxiliary oil tank, a reinforcing rib structure is welded on its side wall. Then, in the large-capacity short-circuit arc test currently carried out, the reinforcing ribs have been broken several times, and the box body near the reinforcing ribs has obvious deformation, which poses a great safety hazard.

[0004] In summary, the auxiliary oil tank structure of the existing split-type on-load tap-changer has defects. When an arc fault occurs, there is a risk of the tank body rupture, which seriously threatens the overall safety of the converter transformer. Summary of the invention

[0005] In order to solve the above technical problems, the purpose of the present invention is to provide an auxiliary oil tank structure for a split-type on-load tap changer. The original split-type on-load tap changer auxiliary oil tank is strengthened by welding a local protrusion on the outside of the box body, and the reinforcing rib structure is relatively simple, which does not significantly improve the overall strength. The present invention optimizes the reinforcing rib structure, adds a right-angle seat and horizontal and vertical ribs, which can effectively improve the structural strength of the auxiliary oil tank and effectively reduce the deformation of the box shell during an arc fault.

[0006] In order to achieve the above object, the present invention adopts the following scheme.

[0007] An auxiliary oil tank structure for a split-type on-load tap changer comprises an auxiliary oil tank, reinforcing ribs, an oil chamber barrel and a pressure release valve.

[0008] Optionally, the auxiliary oil tank includes: an oil tank body and a tank top cover, wherein the tank top cover is located above the oil tank body and fixed by bolts; the oil chamber barrel is located inside the auxiliary oil tank and fixed to the tank top cover by bolts; and the pressure relief valve is located above the oil chamber barrel.

[0009] Optionally, the reinforcing ribs include: boss reinforcing ribs, vertical reinforcing ribs, transverse reinforcing ribs and right-angle seat reinforcing ribs.

[0010] Optionally, the boss reinforcement ribs are located on three side walls of the auxiliary oil tank, and another side wall of the auxiliary oil tank is connected to the main oil tank without a reinforcement rib structure.

[0011] Optionally, the boss reinforcement rib is a hollow structure, connected to the auxiliary oil tank by welding, and not connected to the interior of the auxiliary oil tank, and is used to increase the strength of the tank structure by changing the external shape of the auxiliary oil tank.

[0012] Optionally, the vertical and transverse reinforcement ribs are the internal structure of the boss reinforcement ribs, which are fixed to the auxiliary oil tank by welding. The vertical and transverse reinforcement ribs are provided to resist the side deformation caused by the internal pressure and improve the explosion-proof capability of the oil tank.

[0013] Optionally, the intersection points of the transverse reinforcement ribs and the vertical reinforcement ribs and the contact points between the two types of reinforcement ribs and the side walls of the auxiliary oil tank are continuously welded to ensure that the joints have sufficient strength to avoid desoldering or cracking due to vibration or impact.

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

[0015] Compared with the existing split-type on-load tap changer auxiliary oil tank, the present invention optimizes the auxiliary oil tank reinforcement rib structure, adds horizontal and vertical reinforcement ribs and right-angle seat reinforcement ribs and other structures, effectively enhances the tensile strength and bending strength of the auxiliary oil tank, helps to reduce the deformation of the box shell in an arc fault, and enhances the explosion-proof performance of the auxiliary oil tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings illustrate exemplary embodiments of the present invention and together with the description serve to explain the principles of the present invention. These drawings are included to provide a further understanding of the present invention and are incorporated in and constitute a part of this specification.

[0017] Figure 1 It is a front view of an auxiliary oil tank structure of a split on-load tap changer according to an embodiment of the present invention;

[0018] Figure 2 It is a left view of an auxiliary oil tank structure of a split on-load tap changer according to an embodiment of the present invention;

[0019] Figure 3 It is a front view of a structural reinforcement rib of an auxiliary oil tank of a split-type on-load tap changer according to an embodiment of the present invention;

[0020] Figure 4 It is a left view of a structural reinforcement rib of an auxiliary oil tank of a split-type on-load tap changer according to an embodiment of the present invention;

[0021] Figure 5 It is a three-dimensional diagram of an auxiliary oil tank structure of a split on-load tap changer according to an embodiment of the present invention;

[0022] Among them, 1. Auxiliary oil tank; 2. Reinforcement ribs; 3. Oil chamber barrel; 4. Pressure relief valve;

[0023] 101. fuel tank body; 102. tank body top cover;

[0024] 201. Boss reinforcement ribs; 202. Vertical reinforcement ribs; 203. Horizontal reinforcement ribs; 204. Right-angle seat reinforcement ribs. DETAILED DESCRIPTION

[0025] The following is combined with Figures 1 to 5 The present invention is further described in detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant contents, rather than to limit the present invention. It is also necessary to explain that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings.

[0026] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] Unless otherwise specified, the exemplary embodiments / embodiments shown will be understood as exemplary features that provide various details of some ways in which the technical concept of the present invention can be implemented in practice. Therefore, unless otherwise specified, the features of the various embodiments / embodiments can be combined, separated, interchanged and / or rearranged without departing from the technical concept of the present invention.

[0028] The use of cross-hatching and / or shading in the accompanying drawings is generally used to make the boundaries between adjacent components clear. As such, unless otherwise specified, the presence or absence of cross-hatching or shading does not convey or indicate any preference or requirement for the specific materials, material properties, dimensions, proportions, commonalities between the components shown, and / or any other characteristics, attributes, properties, etc. of the components. In addition, in the accompanying drawings, the sizes and relative sizes of the components may be exaggerated for clarity and / or descriptive purposes. When the exemplary embodiments can be implemented differently, the specific process sequence can be performed in a different order than described. For example, two successively described processes can be performed substantially simultaneously or in an order opposite to the described order. In addition, the same figure numbers represent the same components.

[0029] When a component is referred to as being "on" or "over," "connected to," or "coupled to" another component, the component may be directly on, directly connected to, or directly coupled to the other component, or intervening components may be present. However, when a component is referred to as being "directly on," "directly connected to," or "directly coupled to" another component, there are no intervening components. For this purpose, the term "connected" may refer to a physical connection, an electrical connection, etc., with or without intervening components.

[0030] For descriptive purposes, the present invention may use spatially relative terms such as "below", "beneath", "under", "lower", "above", "upper", "above", "higher", and "side (e.g., as in "sidewall")" to describe the relationship of one component to another (other) component as shown in the accompanying drawings. The spatially relative terms are intended to encompass different orientations of the device in use, operation, and / or manufacture in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, components described as "below" or "beneath" other components or features would then be positioned "above" the other components or features. Thus, the exemplary term "below" can encompass both the "above" and "below" orientations. Furthermore, the device may be otherwise oriented (e.g., rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.

[0031] The terms used here are for the purpose of describing specific embodiments, and are not intended to be restrictive. As used here, unless the context clearly indicates otherwise, the singular forms "one (kind, person)" and "said (the)" are also intended to include plural forms. In addition, when the terms "comprise" and / or "include" and their variations are used in this specification, it is explained that there are stated features, integral bodies, steps, operations, parts, assemblies and / or their groups, but it is not excluded that there are or add one or more other features, integral bodies, steps, operations, parts, assemblies and / or their groups. It should also be noted that, as used here, the terms "substantially", "approximately" and other similar terms are used as approximate terms and not as degree terms, so that they are used to explain the inherent deviations of the measured values, calculated values ​​and / or the values ​​provided that will be recognized by those of ordinary skill in the art.

[0032] In one embodiment, the present invention provides an auxiliary oil tank structure for a split-type on-load tap changer, the auxiliary oil tank structure comprising: an auxiliary oil tank, reinforcing ribs, an oil chamber barrel and a pressure release valve.

[0033] Optionally, the auxiliary oil tank includes: an oil tank body and a tank top cover, wherein the tank top cover is located above the oil tank body and fixed by bolts; the oil chamber barrel is located inside the auxiliary oil tank and fixed to the tank top cover by bolts; and the pressure relief valve is located above the oil chamber barrel.

[0034] Optionally, the reinforcing ribs include: boss reinforcing ribs, vertical reinforcing ribs, transverse reinforcing ribs and right-angle seat reinforcing ribs.

[0035] Optionally, the boss reinforcement ribs are located on three side walls of the auxiliary oil tank, and another side wall of the auxiliary oil tank is connected to the main oil tank without a reinforcement rib structure.

[0036] Optionally, the boss reinforcement rib is a hollow structure, connected to the auxiliary oil tank by welding, and not connected to the interior of the auxiliary oil tank, and is used to increase the strength of the tank structure by changing the external shape of the auxiliary oil tank.

[0037] Optionally, the vertical and transverse reinforcement ribs are the internal structure of the boss reinforcement ribs, which are fixed to the auxiliary oil tank by welding. The vertical and transverse reinforcement ribs are provided to resist the side deformation caused by the internal pressure and improve the explosion-proof capability of the oil tank.

[0038] Optionally, the intersection points of the transverse reinforcement ribs and the vertical reinforcement ribs and the contact points between the two types of reinforcement ribs and the side walls of the auxiliary oil tank are continuously welded to ensure that the joints have sufficient strength to avoid desoldering or cracking due to vibration or impact.

[0039] In one embodiment, referring to Figure 1 and Figure 2The present invention provides an auxiliary oil tank structure for a split-type on-load tap changer, the auxiliary oil tank structure comprising: an auxiliary oil tank (1), a reinforcing rib (2), an oil chamber barrel (3) and a pressure release valve (4).

[0040] The auxiliary oil tank (1) comprises: an oil tank body (101) and a tank body top cover (102); the tank body top cover (102) is located above the oil tank body (101) and is fixed by bolts.

[0041] Reference Figure 1 The oil chamber barrel (3) is located inside the auxiliary oil tank (1) and is fixed to the tank top cover (102) by bolts; and is arranged symmetrically about the central axis of the auxiliary oil tank (1); and the pressure relief valve (4) is located directly above the oil chamber barrel (3). Figure 3 The reinforcing ribs (2) include: boss reinforcing ribs (201), vertical reinforcing ribs (202), transverse reinforcing ribs (203) and right-angle seat reinforcing ribs (204).

[0042] The boss reinforcement ribs (201) are located on three side walls of the auxiliary oil tank, and the other side wall of the auxiliary oil tank is connected to the main oil tank without a reinforcement rib structure. The boss reinforcement ribs (201) are hollow structures, and the four sides are connected to the auxiliary oil tank by welding, and are not connected to the inside of the auxiliary oil tank. The strength of the oil tank structure is increased by changing the external shape of the auxiliary oil tank.

[0043] The vertical reinforcement ribs (202) and the transverse reinforcement ribs (203) are the internal structure of the boss reinforcement ribs (201), which are fixed to the auxiliary oil tank (1) by welding. The structural design of the transverse and vertical reinforcement ribs can resist the side deformation caused by the internal pressure, and effectively improve the explosion-proof ability of the oil tank. The transverse reinforcement ribs (203) and the vertical reinforcement ribs (202) can support each other, further improving the overall stability of the oil tank structure, resisting mechanical impact, thermal expansion and torsional deformation, etc., and preventing local instability.

[0044] In one embodiment, referring to Figure 3 The boss reinforcement ribs (201) include three vertical reinforcement ribs (202) arranged at equal distances and three transverse reinforcement ribs (203) arranged perpendicular to the vertical reinforcement ribs (202); wherein the two transverse reinforcement ribs located near the top and bottom of the oil tank are arranged symmetrically with respect to the transverse reinforcement rib located in the middle, and both are at a certain distance from the top and the bottom.

[0045] In one embodiment, the contact points between the transverse reinforcing ribs (203) and the vertical reinforcing ribs (202) and the side wall of the oil tank and the intersection points with each other are continuously welded, which can ensure that the connection has sufficient strength and avoid desoldering or cracking due to vibration or impact.

[0046] At the intersection of the transverse reinforcing rib (203) and the vertical reinforcing rib (202), a reinforcing plate or a reinforcing block is used for local thickening welding to further improve the strength of the intersection and prevent damage caused by stress concentration.

[0047] In one embodiment, referring to Figure 1 The right-angle seat reinforcement ribs (204) are arranged on the outer wall of the auxiliary oil tank, and four are arranged on each side at equal distances; the two right-angle sides of the right-angle seat reinforcement ribs (204) are respectively welded to the auxiliary oil tank and the boss reinforcement ribs, so as to simultaneously improve the structural strength of the two, so as to resist the stress generated at the structural mutation point when an arc fault occurs.

[0048] In one embodiment, one side of the auxiliary oil tank is connected to the main oil tank, and the other three sides are all provided with reinforcement ribs for protection, and all of them are provided in a manner of three vertical reinforcement ribs (202), three horizontal reinforcement ribs (203) and four right-angle seat reinforcement ribs (204) on the left and right. The structure is as follows: Figure 5 shown.

[0049] When an arc fault occurs, the diaphragm of the pressure relief valve is impacted and opens, releasing the pressure in the oil chamber barrel. When the arc discharge energy is small, the pressure relief valve can release the pressure in the oil chamber barrel to a safe level in time. However, when the arc discharge energy is large, the bottom of the oil chamber barrel often breaks earlier than the pressure relief valve, and the pressure in the oil chamber is released into the auxiliary oil tank, causing the auxiliary oil tank to be impacted. In this case, the structure of the boss reinforcement rib (201), the vertical reinforcement rib (202), the transverse reinforcement rib (203) and the right-angle seat reinforcement rib (204) can effectively enhance the tensile strength and bending strength of the auxiliary oil tank, effectively reduce the deformation of the box shell in the arc fault, and enhance the explosion-proof performance of the auxiliary oil tank. The reinforcement rib significantly increases the section inertia moment by increasing the effective cross-section of the structure, thereby enhancing the deformation resistance of the structure. At the same time, the transverse and longitudinal reinforcement ribs are provided to help the oil tank resist deformation in different directions at the same time, thereby improving the stability of the overall structure. The presence of reinforcement ribs changes the force transmission path, making the stress distribution on the tank wall more uniform. The coordinated setting of transverse and longitudinal reinforcement ribs further diversifies the force transmission path, realizes multi-directional stress dispersion, and improves the overall strength and safety of the structure.

[0050] In the description of this specification, the description with reference to the terms "one embodiment / method", "some embodiments / methods", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment / method or example are included in at least one embodiment / method or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment / method or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments / methods or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments / methods or examples described in this specification and the features of the different embodiments / methods or examples, unless they are contradictory.

[0051] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0052] It should be understood by those skilled in the art that the above embodiments are only for the purpose of clearly illustrating the present invention, and are not intended to limit the scope of the present invention. For those skilled in the art, other changes or modifications may be made based on the above disclosure, and these changes or modifications are still within the scope of the present invention.

Claims

1. An auxiliary oil tank structure for a split-type on-load tap changer, characterized in that: The auxiliary oil tank structure comprises: an auxiliary oil tank, reinforcing ribs, an oil chamber barrel and a pressure release valve.

2. The auxiliary oil tank structure according to claim 1, characterized in that: Preferably, the auxiliary oil tank includes: an oil tank body and a tank top cover, the tank top cover is located above the oil tank body and fixed by bolts; the oil chamber barrel is located inside the auxiliary oil tank and fixed to the tank top cover by bolts; the pressure relief valve is located above the oil chamber barrel.

3. The auxiliary oil tank structure according to claim 1, characterized in that: The reinforcing ribs include: boss reinforcing ribs, vertical reinforcing ribs, transverse reinforcing ribs and right-angle seat reinforcing ribs.

4. The auxiliary oil tank structure according to claim 3, characterized in that: The boss reinforcement ribs are located on three side walls of the auxiliary oil tank, and another side wall of the auxiliary oil tank is connected to the main oil tank without a reinforcement rib structure.

5. The auxiliary oil tank structure according to claim 3, characterized in that: The boss reinforcement rib is a hollow structure, connected to the auxiliary oil tank by welding, and has no connection with the interior of the auxiliary oil tank. It is used to increase the strength of the oil tank structure by changing the external shape of the auxiliary oil tank.

6. The auxiliary oil tank structure according to claim 3, characterized in that: The vertical reinforcement ribs and the transverse reinforcement ribs are the internal structure of the boss reinforcement ribs, which are fixed to the auxiliary oil tank by welding. The vertical reinforcement ribs and the transverse reinforcement ribs are provided to resist the side deformation caused by the internal pressure and improve the explosion-proof capability of the oil tank.

7. The auxiliary oil tank structure according to claim 3, characterized in that: The intersection points of the transverse reinforcement ribs and the vertical reinforcement ribs and the contact points between the two types of reinforcement ribs and the side wall of the auxiliary oil tank are all continuously welded to ensure that the connection has sufficient strength to avoid desoldering or cracking due to vibration or impact.

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