Fastening device for enabling casting body of open-type zero sequence current transformer to be stressed uniformly
By designing a fastener device that includes limited bolts, first adjustment blocks, rectangular pressure reeds, second adjustment blocks and fastening nuts, the opening zero -sequential current transformer is solved. The problem of rupture and unqualified products of the product has achieved uniform pouring stress and improved product quality.
Patent Information
- Application Number
- CN202420210014.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-29
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2034-01-29
AI Technical Summary
In the prior art, the open zero-sequence current transformer has an uneven tightening force or excessively large, resulting in product rupture or unqualified performance, which increases the product's unqualified rate.
A fastener device is designed, including limited bolts, first adjustment blocks, rectangular pressure reeds, second adjustment blocks and tight nuts. Through the combination of these components, the tightness can be evenly applied to avoid excessive tightening force. Large or uneven.
The pouring force of the opening zero -sequence current transformer is uniform, which improves the product's production quality and qualification rate, and ensures the stability and reliability of the product.
Smart Images
Figure CN222421617U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of transformer fastening, in particular to a fastening device which enables an open type zero-sequence current transformer casting body to be evenly stressed. Background Art
[0002] At present, the common fastening and assembly methods are throat clamp fastening, steel belt fastening, bolt and nut fastening, etc. These methods can easily cause the open-type zero-sequence current transformer to be damaged or the product performance cannot meet the requirements of national standards due to external forces such as uneven force or excessive force. The main reason is that the fastening force on the open-type zero-sequence current transformer is uneven or excessive, and the appearance or performance of the product changes, causing the product to break and the performance to be unqualified, which increases the unqualified rate of open-type zero-sequence current transformer products. Utility Model Content
[0003] The utility model aims to provide a fastening device for making the cast body of an open type zero-sequence current transformer bear uniform force, thereby ensuring that the fastening force on the cast body of the transformer is uniform and reasonable, avoiding changes in its appearance or performance, and improving the product qualification rate.
[0004] To achieve the above-mentioned purpose, the technical solution of the present application is: a fastening device that makes the cast body of an open-type zero-sequence current transformer subjected to uniform force, including a fastening device located on both sides of the upper cast body and the lower cast body, the fastening device including a limit bolt, a first adjustment block, a rectangular compression spring, a second adjustment block and a fastening nut, the first adjustment block and the rectangular compression spring are sleeved on the upper part of the limit bolt and are located between the bolt head and the upper cast body seat, the second adjustment block and the fastening nut are sleeved on the lower part of the limit bolt and are located under the lower cast body seat.
[0005] Furthermore, the effective thread size of the limiting bolt is fixed, and during fastening and assembly, the travel of the fastening nut is limited by fixing the effective thread size.
[0006] Furthermore, a spring washer is provided between the limiting bolt and the first adjusting block.
[0007] Furthermore, the force exerted on the two casting bodies can be adjusted by changing the thickness of the first adjusting block.
[0008] Furthermore, the number of the second adjustment blocks is increased or decreased according to the thickness of the seat body, so that the effective thread size is fixed to limit the stroke of the fastening nut.
[0009] Furthermore, the rectangular compression spring is made of alloy steel.
[0010] Furthermore, the bottom of the first adjustment block contacts the top of the rectangular compression spring, and the bottom of the rectangular compression spring contacts the upper surface of the upper half casting body seat.
[0011] Furthermore, the top of the second adjustment block contacts the lower surface of the lower half casting body seat, and the bottom of the second adjustment block contacts the top of the fastening nut.
[0012] The utility model adopts the above technical solution, and can achieve the following technical effects:
[0013] 1. Easy to make, improve product quality, and increase product qualification rate: The utility model makes effective and simple changes on the basis of the original bolt fastening method, that is, the original ordinary fastening bolt is changed into a limit bolt, so that the fastening force on the open-type zero-sequence current transformer casting body becomes a controllable value, thereby effectively improving the product production quality and increasing the product qualification rate.
[0014] 2. Improve the stress performance of the open type zero sequence current transformer casting body: The rectangular compression spring in the utility model is made of alloy steel, and its toughness and metal fatigue are much better than normal steel. It still has good resilience after being stressed, and its bearing capacity is much higher than that of general compression springs. In the tightening process, the resilience of the rectangular compression spring acts on the open type zero sequence current transformer casting body, and its rectangular structure design makes the force more uniform.
[0015] 3. Stable and reliable: When the open-type zero-sequence current transformer is fastened and assembled using a combination of limit bolts and rectangular compression springs, the performance of the open-type zero-sequence current transformer is fully guaranteed, and the casting body will no longer rupture due to uneven or excessive fastening force. The use of limit bolts makes the force on the casting body of the open-type zero-sequence current transformer controllable and more stable, and the use of rectangular compression springs makes the force on the casting body of the zero-sequence current transformer more uniform, thereby improving the production quality of the fastening assembly of the open-type zero-sequence current transformer and further improving the production qualification rate of the open-type zero-sequence current transformer. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a schematic diagram of the application of the fastening device to the open type zero sequence current transformer;
[0017] Figure 2 It is a top view of the fastening device applied to the open type zero sequence current transformer;
[0018] Explanation of the serial numbers in the figure: 1. Upper half casting body, 2. Limit bolt, 3. First adjustment block, 4. Rectangular compression spring, 5. Fastening nut, 6. Second adjustment block. DETAILED DESCRIPTION
[0019] The principles of the present disclosure will be described below with reference to several example embodiments shown in the accompanying drawings. Although preferred embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that these embodiments are described only to enable those skilled in the art to better understand and implement the present disclosure, and are not intended to limit the scope of the present disclosure in any way.
[0020] As used herein, the term "including" and its variations mean open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "based at least in part on". The terms "an example embodiment" and "an embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc. may refer to different or the same objects. Other explicit and implicit definitions may also be included below.
[0021] The present embodiment provides a fastening device for making the cast body of an open-type zero-sequence current transformer evenly stressed, which is implemented based on the cast body of an open-type zero-sequence current transformer, a limit bolt, a rectangular compression spring, a first adjustment block, a second adjustment block and a fastening nut. The limit bolt, the rectangular compression spring and the fastening nut are subjected to metal surface treatment before use, and are required to meet the requirements of the GB / T5267-2016 "Fastener Surface Treatment" standard. The cast body of the open-type zero-sequence current transformer is cut according to the technical requirements, the limit bolt must meet the thread travel requirements, and the rectangular compression spring must meet the GB / T 37306.1-2019 "Metal Material Fatigue Test" and other standards are used to meet the requirements of smooth tightening and assembly of open-type zero-sequence current transformers. Before assembly, the flatness of the fastening surface of the cut open-type zero-sequence transformer casting body must be ensured, so that it is less affected by external forces after assembly. According to the weight of the open-type zero-sequence transformer casting body and the tool parameter sample, a suitable rectangular compression spring is selected to ensure that the open-type zero-sequence transformer casting body will not separate after tightening and assembly and the casting body will not be damaged. The maximum force that can be withstood prevents the casting body from being damaged by excessive force, thereby improving the production quality and service life of the product.
[0022] The method of using the above-mentioned fastening device is as follows:
[0023] S1. Cut the open type zero sequence current transformer casting to obtain the upper half casting 1 and the lower half casting;
[0024] S2. Drill fastening holes on the upper half of the casting body 1 and the lower half of the casting body on both sides of the seat;
[0025] S3. The limiting bolt 2 passes through the first adjustment block 3, the rectangular compression spring 4, the fastening hole of the upper half of the casting body, the fastening hole of the lower half of the casting body, the second adjustment block 6 and the fastening nut 5 in sequence to complete the assembly and fastening of the two casting bodies.
[0026] Specifically, the compression spring with a rectangular structure and alloy steel material has a longer service life, more stable elastic performance and can act evenly on the open-type zero-sequence current transformer casting body, so that the open-type zero-sequence current transformer casting body is more evenly stressed during the tightening and assembly process.
[0027] In an exemplary embodiment, a first adjustment block and a rectangular compression spring are mounted on the limit bolt, and then the assembled limit bolt is passed through the fastening holes of the upper half of the cast body and the lower half of the cast body, and the second adjustment block is mounted on the limit bolt below the fastening hole of the lower half of the cast body and is tightened by tightening the nut. When tightening, the limit bolt is tightened in a diagonal manner so that the four fastening points of the cast body of the open-type zero-sequence current transformer are evenly stressed, thereby ensuring that the product will not be damaged due to uneven stress. Due to the action of the limit bolt, the nut can be tightened. When the force on the product is insufficient or excessive, the force on the cast body can be adjusted by selecting first adjustment blocks of different specifications and thicknesses. When the thickness of the first adjustment block is reduced, the force on the cast body will increase. When the thickness of the first adjustment block is increased, the force on the cast body will decrease. The performance of the product can be adjusted in this way to meet the national standard requirements for product performance. This fastening method is easy and simple to operate, improves the pass rate of open-type zero-sequence current transformers, and makes the performance of open-type zero-sequence current transformers more stable and reliable.
[0028] In an exemplary embodiment, the effective thread size of the limit bolt 2 is fixed. When performing the fastening and assembly process, the travel of the fastening nut 5 is limited by fixing the effective thread size, so that the force value of the open-type zero-sequence current transformer casting body is fixed during the fastening and assembly process. Since the thickness of the transformer base body of each specification is different, the travel of the fastening nut can be limited by fixing the effective thread size by increasing or decreasing the number of second adjustment blocks, and the nut tightening can be time-saving.
[0029] The utility model discloses a fastening device which makes the cast body of an open-type zero-sequence current transformer bear uniform force, so as to solve the problem that the fastening force on the open-type zero-sequence current transformer is uneven or too large, resulting in product rupture and unqualified performance. The performance of the product can also be adjusted by increasing or decreasing the thickness or number of adjustment blocks. This fastening method is a very practical technical solution developed through long-term practice and application.
[0030] The above description is only an optional embodiment of the present disclosure and is not intended to limit the present disclosure. For those skilled in the art, the present disclosure may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.
[0031] Although the claims in this application have been formulated with respect to particular combinations of features, it will be understood that the scope of the present disclosure also includes any novel feature or any novel combination of features disclosed herein, whether explicitly or implicitly or in any generalization thereof, whether or not relating to the same scheme in any claim currently claimed.
Claims
1. A fastening device for making the cast body of an open type zero-sequence current transformer bear force uniformly, comprising fastening devices located on both sides of the upper half of the cast body and the lower half of the cast body, characterized in that: The fastening device includes a limiting bolt, a first adjustment block, a rectangular compression spring, a second adjustment block and a fastening nut. The first adjustment block and the rectangular compression spring are sleeved on the upper part of the limiting bolt and are located between the bolt head and the upper half of the casting body seat. The second adjustment block and the fastening nut are sleeved on the lower part of the limiting bolt and are located under the lower half of the casting body seat.
2. A fastening device for making the cast body of an open type zero-sequence current transformer bear force uniformly according to claim 1, characterized in that: The effective thread size of the limit bolt is fixed. During fastening and assembly, the travel of the fastening nut is limited by fixing the effective thread size.
3. A fastening device for making the cast body of an open type zero-sequence current transformer bear force uniformly according to claim 1, characterized in that: A spring washer is provided between the limiting bolt and the first adjusting block.
4. A fastening device for making the cast body of an open type zero-sequence current transformer bear force uniformly according to claim 1, characterized in that: The force magnitudes of the two casting bodies are adjusted by changing the thickness of the first adjusting block.
5. A fastening device for making the cast body of an open type zero-sequence current transformer bear force uniformly according to claim 2, characterized in that: The number of the second adjustment blocks is increased or decreased according to the thickness of the seat body, so that the effective thread size is fixed to limit the travel of the fastening nut.
6. A fastening device for making the cast body of an open type zero-sequence current transformer bear force uniformly according to claim 1, characterized in that: The rectangular compression spring is made of alloy steel.
7. A fastening device for making the cast body of an open type zero-sequence current transformer bear force uniformly according to claim 1, characterized in that: The bottom of the first adjustment block contacts the top of the rectangular compression spring, and the bottom of the rectangular compression spring contacts the upper surface of the upper half casting body seat.
8. A fastening device for making the cast body of an open type zero-sequence current transformer bear force uniformly according to claim 1, characterized in that: The top of the second adjusting block contacts the lower surface of the lower half casting body seat, and the bottom of the second adjusting block contacts the top of the fastening nut.