An auxiliary tank structure for a split type on-load tap changer

Abstract

The application provides an auxiliary oil tank structure for a split type on-load tap changer, which comprises an auxiliary oil tank, a reinforcing rib, an oil chamber barrel and a pressure release valve; the auxiliary oil tank comprises an oil tank body and a tank top cover which is arranged above the oil tank body and is fixed by bolts; the oil chamber barrel is arranged in the interior of the auxiliary oil tank and is fixed by bolts and the tank top cover; and the pressure release valve is arranged above the oil chamber barrel. Compared with the existing auxiliary oil tank of the split type on-load tap changer, the auxiliary oil tank reinforcing rib structure is optimized, horizontal and vertical reinforcing ribs and right-angle seat reinforcing ribs and other structures are added, the tensile strength and the bending strength of the auxiliary oil tank are effectively enhanced, the deformation of the tank shell in arc fault is reduced, and the explosion-proof performance of the auxiliary oil tank is enhanced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of explosion-proof of power equipment, and particularly relates to an auxiliary oil tank structure for a split type on-load tap changer. BACKGROUND

[0002] The on-load tap changer of the extra-high voltage converter transformer realizes compensation of voltage fluctuation, improvement of power quality and stabilization of DC transmission power by adjusting the winding ratio, but it includes numerous components with complex structure and precise cooperation. Once the switching time error of the components exceeds a certain range, the switching of the tap changer may fail, continuous arc may occur between the contacts, and arc discharge of hundreds of kiloampere may occur inside the switching switch, and the discharge energy may be several megajoules or even tens of megajoules. In the face of such huge energy, the pressure relief valve cannot completely ensure that the pressure is released in time, and in severe cases, the converter transformer may explode and catch fire.

[0003] In order to reduce the loss in the event of an accident, the switching core part prone to arc failure of the split type on-load tap changer is separately placed in an oil tank, and electrical connection is realized through an internal sleeve and other parts. The oil tank is referred to as the "auxiliary oil tank" of the split type on-load tap changer. Before the split type on-load tap changer is put into use, a large-capacity short-circuit arc test is carried out to verify the reliability of the oil tank structure. In order to strengthen the strength of the auxiliary oil tank, a reinforcing rib structure is welded on the side wall of the auxiliary oil tank. Then, in the large-capacity short-circuit arc test currently carried out, the reinforcing rib has been broken several times, and the tank body near the reinforcing rib has obvious deformation, which has 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 tank rupture, which seriously threatens the overall safety of the converter transformer. SUMMARY

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

[0006] In order to achieve the above purpose, the present application adopts the following scheme.

[0007] An auxiliary oil tank structure for a split type on-load tap changer, the auxiliary oil tank structure comprising: an auxiliary oil tank, a reinforcing rib, an oil chamber barrel and a pressure relief valve.

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

[0009] Optionally, the reinforcing rib comprises: a boss reinforcing rib, a vertical reinforcing rib, a horizontal reinforcing rib and a right angle seat reinforcing rib.

[0010] Optionally, the boss reinforcing rib is located on three side walls of the auxiliary oil tank, and the other side wall of the auxiliary oil tank is connected with the main oil tank without a reinforcing rib structure.

[0011] Optionally, the boss reinforcing rib is a hollow structure, is connected with the auxiliary oil tank by welding and is not communicated with the inside of the auxiliary oil tank, and is used for increasing the strength of the oil tank structure by changing the external shape of the auxiliary oil tank.

[0012] Optionally, the vertical reinforcing rib and the horizontal reinforcing rib are internal structures of the boss reinforcing rib, are fixed on the auxiliary oil tank by welding, and the vertical reinforcing rib and the horizontal reinforcing rib are arranged to resist the side deformation caused by internal pressure and improve the explosion-proof capability of the oil tank.

[0013] Optionally, the intersection of the horizontal reinforcing rib and the vertical reinforcing rib and the contact points of the two types of reinforcing ribs and the side walls of the auxiliary oil tank are continuously welded to ensure that the connection has sufficient strength and avoid welding or rupture caused by vibration or impact.

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

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

[0016] The accompanying drawings illustrate exemplary embodiments of the present application and together with the general description of the application given above and the detailed description of the application given below, serve to explain the principles of the present application. These drawings are included herewith and constitute a part of this specification.

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

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

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

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

[0021] Figure 5 is a perspective view of an auxiliary oil tank structure of a split type on-load tap changer according to an embodiment of the present application;

[0022] wherein 1, auxiliary oil tank; 2, reinforcing rib; 3, oil chamber barrel; 4, pressure release valve;

[0023] 101, oil tank body; 102, tank top cover;

[0024] 201, boss reinforcing rib; 202, vertical reinforcing rib; 203, horizontal reinforcing rib; 204, right angle seat reinforcing rib. DETAILED DESCRIPTION

[0025] The present application will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are intended to be illustrative only and not limiting of the present application. In addition, it should be noted that only the parts pertinent to the present application are shown in the drawings. Figures 1 to 5 and embodiments. It should be understood that the specific embodiments described herein are intended to be illustrative only and not limiting of the present application. In addition, it should be noted that only the parts pertinent to the present application are shown in the drawings.

[0026] It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict. The technical solutions of the present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0027] Unless otherwise specified, the exemplary embodiments / examples shown will be understood as providing exemplary features of various details that can embody the technical ideas of the present application in practice. Therefore, unless otherwise specified, the features of various embodiments / examples can be additionally combined, separated, interchanged and / or rearranged without departing from the technical ideas of the present application.

[0028] The use of cross-hatching and / or shading in the drawings is generally used to illustrate the boundaries and / or transitions from one portion of a part to another portion of a part. As such, unless specified, the presence of cross-hatching or shading in no way supercedes, or otherwise clarifies, any aspect of the parts described as being clear, transparent, opaque, solid, formed, unformed, etc. Moreover, in the drawings, the size and relative sizes of parts can be exaggerated for clarity. When exemplary embodiments can be carried out in different ways, the specific sequential order described can be performed in a different order. For example, two sequentially described processes can be performed at about the same time or in the reverse order than described. Additionally, like reference numerals can denote like parts throughout the description.

[0029] When a part is referred to as being "on" or "over" another part, "connected to" or "coupled to" another part, it can be directly on, directly connected to, or directly coupled to the other part, or intervening parts can be present. In contrast, when an part is referred to as being "directly on," "directly connected to," or "directly coupled to" another part, there are no intervening parts present. For example, the term "connected" can refer to physical or electrical connection, whether direct or through intervening parts.

[0030] For purposes of the description hereinafter, spatial or directional terms, such as "below," "lower," "down," "upright," "above," "upper," "over," "higher," and "side" (e.g., as in "sidewall") are used with reference to the orientation of the device as shown in the drawings. The spatial or directional terms are intended to encompass different orientations of the device in use, operation, and / or manufacture, depending on the particular spatial or directional term used. For example, if the device in the drawings is turned over, then the part described as "below" or "under" other parts or features would then be oriented "above" the other parts or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. Moreover, the device can be oriented in different ways (e.g., rotated 90 degrees or at other orientations) and, as such, the spatial or directional terms used herein are intended to be interpreted accordingly.

[0031] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, to the extent that the terms "comprising," "including," "containing," and / or "having" and variations thereof are used herein, such terms are intended to be inclusive, in an aspect, it is noted that the terms "substantially," "approximately," and other similar terms are used as terms of approximation and not as terms of degree, accordingly, they are utilized to account for inherent variations in measurements, calculations, and / or provided values that would be appreciated by those of ordinary skill in the art.

[0032] In one embodiment, the present application provides an auxiliary tank structure for split on-load tap changer, the auxiliary tank structure comprises: an auxiliary tank, a reinforcing rib, an oil chamber barrel and a pressure relief valve.

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

[0034] Optionally, the reinforcing rib comprises: a boss reinforcing rib, a vertical reinforcing rib, a horizontal reinforcing rib and a right angle seat reinforcing rib.

[0035] Optionally, the boss reinforcing rib is located on three side walls of the auxiliary tank, and the other side wall of the auxiliary tank is connected with the main tank without reinforcing rib structure.

[0036] Optionally, the boss reinforcing rib is a hollow structure, which is connected with the auxiliary tank by welding and is not communicated with the inside of the auxiliary tank, and is used to change the external shape of the auxiliary tank to increase the strength of the tank structure.

[0037] Optionally, the vertical reinforcing rib and the horizontal reinforcing rib are internal structures of the boss reinforcing rib, which are fixed on the auxiliary tank by welding, and the vertical reinforcing rib and the horizontal reinforcing rib are arranged to resist the side deformation caused by internal pressure and improve the explosion-proof capability of the tank.

[0038] Optionally, the intersection of the horizontal reinforcing rib and the vertical reinforcing rib and the contact points of the two types of reinforcing ribs and the side walls of the auxiliary tank are continuously welded to ensure that the connection has sufficient strength and avoid disbonding or rupture caused by vibration or impact.

[0039] In one embodiment, reference is made to Figure 1 and Figure 2The application provides an auxiliary oil tank structure for a split type on-load tap changer, which comprises 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 top cover (102) arranged above the oil tank body (101) and fixed by bolts.

[0041] With reference to Figure 1 The oil chamber barrel (3) is arranged inside the auxiliary oil tank (1) and fixed by bolts and the tank top cover (102), and is symmetrically arranged about the central axis of the auxiliary oil tank (1); and the pressure release valve (4) is arranged directly above the oil chamber barrel (3). Figure 3 The reinforcing rib (2) comprises a boss reinforcing rib (201), a vertical reinforcing rib (202), a horizontal reinforcing rib (203) and a right-angle seat reinforcing rib (204).

[0042] The boss reinforcing rib (201) is arranged on three side walls of the auxiliary oil tank, and the other side wall of the auxiliary oil tank is connected with the main oil tank without a reinforcing rib structure. The boss reinforcing rib (201) is a hollow structure, and four edges thereof are connected with the auxiliary oil tank by welding and are not communicated with the inside of the auxiliary oil tank, and the external shape of the auxiliary oil tank is changed to increase the strength of the oil tank structure.

[0043] The vertical reinforcing rib (202) and the horizontal reinforcing rib (203) are internal structures of the boss reinforcing rib (201) and are fixed on the auxiliary oil tank (1) by welding. The structure design of the vertical and horizontal reinforcing ribs can resist the side deformation caused by internal pressure and effectively improve the explosion-proof capacity of the oil tank. The horizontal reinforcing rib (203) and the vertical reinforcing rib (202) can support each other, further improve the overall stability of the oil tank structure, resist mechanical impact, thermal expansion and torsional deformation and the like, and prevent local instability.

[0044] In one embodiment, with reference to Figure 3 The boss reinforcing rib (201) comprises three vertical reinforcing ribs (202) arranged at equal distances and three horizontal reinforcing ribs (203) arranged perpendicularly to the vertical reinforcing ribs (202); wherein two horizontal reinforcing ribs arranged near the top and bottom positions of the oil tank are symmetrically arranged about the horizontal reinforcing rib arranged at the middle position and are away from the top and bottom positions by a certain distance.

[0045] In one embodiment, the contact points of the horizontal reinforcing rib (203) and the vertical reinforcing rib (202) with the side wall of the oil tank and the intersection points of the horizontal reinforcing rib (203) and the vertical reinforcing rib (202) are continuously welded, which can ensure that the connection has sufficient strength and avoid disconnection or rupture caused by vibration or impact.

[0046] At the intersection of the horizontal reinforcing ribs (203) and the vertical reinforcing ribs (202), local thickening welding is performed using reinforcing plates or reinforcing blocks to further improve the strength at the intersection and prevent damage caused by stress concentration.

[0047] In one embodiment, referring to Figure 1 , the right-angle seat reinforcing ribs (204) are arranged on the outer wall of the auxiliary oil tank, with 4 on each side at equal distances; the two right-angle edges of the right-angle seat reinforcing ribs (204) are welded on the auxiliary oil tank and the boss reinforcing ribs respectively, for simultaneously improving the structural strength of both to resist the stress 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 remaining three sides are all provided with reinforcing rib protection, and all adopt the arrangement mode of three vertical reinforcing ribs (202), three horizontal reinforcing ribs (203), and four right-angle seat reinforcing ribs (204) on the left and right, and the structure is as shown in Figure 5 .

[0049] When an arc fault occurs, the pressure relief valve diaphragm is impacted and opened to release the pressure in the oil chamber barrel. When the arc discharge energy is small, the pressure relief valve can timely release the pressure in the oil chamber barrel to a safe level, however, when the arc discharge energy is large, the bottom of the oil chamber barrel often ruptures 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 structures of the boss reinforcing ribs (201), the vertical reinforcing ribs (202), the horizontal reinforcing ribs (203), and the right-angle seat reinforcing ribs (204) can effectively enhance the tensile strength and bending strength of the auxiliary oil tank, effectively reduce the deformation of the tank shell in an arc fault, and enhance the explosion-proof performance of the auxiliary oil tank. The reinforcing ribs significantly improve the sectional moment of inertia by increasing the effective cross section of the structure, thereby enhancing the anti-deformation ability of the structure, and the arrangement of the horizontal and vertical reinforcing ribs helps the oil tank to resist deformation in different directions at the same time, improving the stability of the overall structure. The presence of the reinforcing ribs changes the force transmission path, making the stress distribution on the oil tank wall more uniform, and the combined arrangement of the horizontal and vertical reinforcing ribs further diversifies the force conduction path, achieving multi-directional stress dispersion and improving the overall strength and safety of the structure.

[0050] In the description of the specification, the description of the terms "one embodiment / way", "some embodiments / ways", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment / way or example are included in at least one embodiment / way or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment / way or example. Also, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments / ways or examples. In addition, the person skilled in the art can combine and combine the different embodiments / ways or examples described in the specification and the features of the different embodiments / ways or examples, without contradiction.

[0051] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0052] The person skilled in the art should understand that the above-mentioned embodiments are only for the purpose of clearly illustrating the present application, and are not intended to limit the scope of the present application. Based on the above disclosure, other changes or modifications can also be made by those skilled in the art, and these changes or modifications are still within the scope of the present application.

Claims

1. An auxiliary tank structure for a split-type on-load tap changer, characterized by, The auxiliary oil tank structure comprises an auxiliary oil tank, a reinforcing rib, an oil chamber barrel and a pressure relief valve. The auxiliary oil tank comprises an oil tank body and a tank top cover, the tank top cover is located above the oil tank body and is fixed by bolts; the oil chamber barrel is located inside the auxiliary oil tank and is fixed by bolts and the tank top cover; the pressure relief valve is located above the oil chamber barrel. When an arc fault occurs, the pressure relief valve diaphragm is impacted and opened to release the pressure in the oil chamber barrel; when the arc discharge energy is small, the pressure relief valve can timely release the pressure in the oil chamber barrel to a safe level; when the arc discharge energy is large, the bottom of the oil chamber barrel will often rupture earlier than the pressure relief valve, and the pressure in the oil chamber is released into the auxiliary oil tank; the reinforcing rib comprises a boss reinforcing rib, a vertical reinforcing rib, a horizontal reinforcing rib and a right-angle seat reinforcing rib; the right-angle seat reinforcing rib is arranged on the outer wall of the auxiliary oil tank, and four right-angle seat reinforcing ribs are arranged at equal distances on both sides; the two right-angle edges of the right-angle seat reinforcing rib are respectively welded on the auxiliary oil tank and the boss reinforcing rib, for simultaneously improving the structural strength of the two, to resist the stress generated at the structural mutation point when an arc fault occurs. The intersection of the horizontal reinforcing rib and the vertical reinforcing rib and the contact points of the two types of reinforcing ribs and the side wall of the auxiliary oil tank are continuously welded, to ensure that the connection has sufficient strength and avoid disbonding or rupture caused by vibration or impact.

2. The attached oil tank structure according to claim 1, characterized by The boss reinforcing rib is located on three side walls of the auxiliary oil tank, and the other side wall of the auxiliary oil tank is connected with the main oil tank without a reinforcing rib structure.

3. The attached oil tank structure according to claim 1, characterized by The boss reinforcing rib is a hollow structure, which is connected with the auxiliary oil tank by welding and is not connected with the inside of the auxiliary oil tank, and is used to increase the strength of the oil tank structure by changing the external shape of the auxiliary oil tank.

4. The auxiliary oil tank structure according to claim 1, characterized by The vertical reinforcing rib and the horizontal reinforcing rib are internal structures of the boss reinforcing rib, which are fixed on the auxiliary oil tank by welding, and the vertical reinforcing rib and the horizontal reinforcing rib are arranged to resist the side deformation caused by internal pressure and improve the explosion-proof capability of the oil tank.

5. The attached oil tank structure according to claim 1, characterized by At the intersection of the horizontal reinforcing rib and the vertical reinforcing rib, 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.

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