Simple on-load tap-changer switching core assembly structure

Abstract

The utility model discloses a simple on-load tap-changer switching core assembling structure which comprises a main shaft and a moving contact group. The moving contact group comprises a moving contact support plate, a transition contact, a contact and a resistance plate; the moving contact group sleeves the outer side of the main shaft; the main shaft is a spline shaft; the moving contact support plate is provided with a spline groove, and the spline groove is matched with the spline shaft, so that the moving contact support plate is fixed on the outer side of the main shaft. According to the utility model, a drilling process is canceled on the main shaft, a structure that the spline groove is matched with the spline shaft is adopted, and the moving contact support plate is fixed on the main shaft, so that the strength of the main shaft is ensured, the running reliability of the tap switch is improved, and meanwhile, the body health of operators is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of on-load tap changers, and in particular relates to a simple on-load tap changer switching core assembly structure. Background Art

[0002] In existing simple on-load tap-changers, the moving contact assembly is assembled and fixed to the main shaft through a drilling process. The main shaft is usually a cylindrical insulating component. Holes must be drilled and tapped before the moving contact assembly is fixed with bolts. However, drilling the main shaft requires penetrating the shaft, which affects its strength and poses a risk of breakage. If the main shaft breaks due to insufficient strength during normal operation of the tap-changer in the transformer, it will inevitably cause a major accident and unnecessary property damage. Furthermore, drilling generates a large amount of dust, which, if inhaled, can cause serious harm to the human body and pollute the environment. Dust removal is difficult and creates a poor workplace environment. Utility Model Content

[0003] To address the above-mentioned drawbacks, the present invention aims to provide a simplified on-load tap changer core assembly structure. This structure eliminates the drilling process and uses splined fitting to secure the moving contact assembly to the main shaft, making the main shaft assembly structure more reliable and ensuring the health of workers.

[0004] In order to achieve the above technical objectives, the following technical solutions are adopted:

[0005] A simplified on-load tap changer switching core assembly structure comprises a main shaft and a moving contact group; the moving contact group comprises a moving contact support plate, a transition contact, a contact and a resistor plate; the moving contact group is sleeved on the outside of the main shaft; the main shaft is a spline shaft; a spline groove is provided on the moving contact support plate, and the spline groove cooperates with the spline shaft to fix the moving contact support plate on the outside of the main shaft.

[0006] Furthermore, the spline shaft is a cross spline shaft; and the spline groove is a cross spline groove.

[0007] Furthermore, the cross spline has four keyways, wherein three keyways have the same width, and one keyway has a width greater than that of the remaining three keyways.

[0008] Furthermore, the cross spline shaft has four splines, wherein three splines have the same width, and one spline has a width greater than that of the remaining three splines.

[0009] Furthermore, the transition contact, contacts and resistor plate are fixed to the moving contact support plate by bolts; the transition contact is located at the front end of the moving contact support plate, the contacts are symmetrically distributed on both sides of the transition contact, and the resistor plate surrounds the rear end of the moving contact support plate.

[0010] Furthermore, there are three moving contact groups, which are sequentially spaced and sleeved on the outside of the main shaft.

[0011] Furthermore, a bushing is provided on the outer side of the main shaft, and the bushing is arranged above each group of moving contacts.

[0012] Furthermore, the bushing is in a hollow cylindrical shape, used to support the moving contact groups and ensure the spacing distance between each group of moving contact groups.

[0013] The beneficial effects achieved by the utility model are:

[0014] This utility model provides a simplified on-load tap changer switching core assembly structure that eliminates the need for drilling on the main shaft. The main shaft is modified from a traditional cylindrical shape to a cross spline shaft structure. A cross spline groove is provided on the moving contact support plate. The cross spline shaft and the cross spline groove cooperate to allow the moving contact support plate to be fixedly sleeved on the outside of the main shaft, securing the contacts to prevent rotation. The moving contact support plate is then supported by a bushing. This assembly structure does not damage the main shaft strength, ensuring reliable operation of the tap changer and improving the product's market competitiveness. Furthermore, since the drilling process is eliminated, a large amount of dust is not generated, ensuring a good operating space for workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be described below with reference to the accompanying drawings.

[0016] Attachment Figure 1 It is a schematic diagram of the overall installation of the utility model.

[0017] Attachment Figure 2 It is a structural schematic diagram of the moving contact support plate in the utility model.

[0018] Attachment Figure 3 It is a cross-sectional view of the main shaft described in the present utility model.

[0019] Attachment Figure 4 It is a structural schematic diagram of the moving contact group described in the utility model.

[0020] Attachment Figure 5 It is a schematic diagram of the assembly of the moving contact support plate and the main shaft in the utility model.

[0021] In the figure: 1. Main shaft; 2. Moving contact group; 21. Moving contact support plate; 22. Transition contact; 23. Contact; 24. Resistor plate; 3. Bolt; 4. Bushing; 11. Cross spline shaft; 211. Cross spline groove. DETAILED DESCRIPTION

[0022] The following describes the implementation of the present invention using specific embodiments. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The embodiments described are merely a portion of the present invention, not all of it. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0023] like Figure 1-5 As shown, a simplified on-load tap changer switching core assembly structure of the present invention comprises a main shaft 1 and a moving contact group 2 , wherein the moving contact group 2 is sleeved on the outside of the main shaft 1 .

[0024] The main shaft 1 is a cross spline shaft 11 , wherein the width of one spline in the cross spline shaft 11 is greater than the widths of the other three splines, and the remaining three splines have the same width.

[0025] The moving contact group 2 includes a moving contact support plate 21, a transition contact 22, a contact 23 and a resistor plate 24; the transition contact 22, the contact 23 and the resistor plate 24 are fixed to the moving contact support plate 21 by bolts 3; the transition contact 22 is located at the front end of the moving contact support plate 21, the contacts 23 are symmetrically distributed on both sides of the transition contact 22, and the resistor plate 24 surrounds the rear end of the moving contact support plate 21; a cross spline groove 211 is provided on the moving contact support plate 21, wherein the width of one keyway in the cross spline groove 211 is greater than the width of the other three keyways, and the remaining three keyways have the same width; the moving contact support plate 21 is fixed to the outside of the main shaft 1 through the cross spline groove 211 and the cross spline shaft 11.

[0026] The number of the moving contact groups 2 is three, forming a switching core, and the moving contact groups 2 are sequentially spaced and sleeved on the outside of the main shaft 1. A hollow cylindrical bushing 4 is sleeved on the main shaft 1 and is located in the middle of each group of moving contact groups 2 to support the moving contact support plate 21 and ensure the spacing distance between each group of moving contact groups 2.

[0027] When in use, the assembly steps of the utility model are:

[0028] Step 1: First, fix the transition contact 22 , the contact 23 and the resistor plate 24 on the moving contact support plate 21 by means of bolts 3 to form the moving contact group 2 .

[0029] Step 2: Then, install the moving contact assembly 2 onto the main shaft 1. Specifically, the cross spline groove 211 of the moving contact support plate 21 passes through the cross spline shaft 11 of the main shaft 1. The wider spline mates with the wider spline groove, and the other three narrower splines mate with the corresponding spline grooves. This completes the installation of the moving contact assembly 2 on the main shaft 1.

[0030] Step 3: The switching core needs to be installed with three sets of moving contact groups 2, and the above steps are repeated. Above each set of moving contact groups 2, a bushing 4 is installed on the main shaft 1 to support the moving contact support plate 21.

[0031] In the present invention, the main shaft 1 transmits the rotational torque to the moving contact group 2 through the cross spline during operation, thereby realizing the gear shifting of the moving contact.

[0032] Other aspects of the present invention that are not described in detail are all conventional technologies known to those skilled in the art.

[0033] It should be noted that the terms "comprises," "includes," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or elements that are inherent to such process, method, article, or apparatus.

[0034] The protection scope of the present invention is not limited to the technical solutions disclosed in the specific implementation methods. Any modifications, equivalent replacements, improvements, etc. made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A simplified on-load tap changer switching core assembly structure, comprising a main shaft (1) and a moving contact group (2); the moving contact group (2) comprises a moving contact support plate (21), a transition contact (22), a contact (23) and a resistor plate (24); the moving contact group (2) is sleeved on the outside of the main shaft (1); and is characterized in that: The main shaft (1) is a spline shaft; a spline groove is provided on the moving contact support plate (21); the spline groove and the spline shaft cooperate with each other, so that the moving contact support plate (21) is fixed on the outside of the main shaft (1).

2. The simplified on-load tap changer switching core assembly structure according to claim 1 is characterized in that: The spline shaft is a cross spline shaft (11); and the spline groove is a cross spline groove (211).

3. The simplified on-load tap changer switching core assembly structure according to claim 2 is characterized in that: The cross spline groove (211) has four key grooves, wherein three key grooves have the same width, and one key groove has a width greater than the widths of the remaining three key grooves.

4. The simplified on-load tap changer switching core assembly structure according to claim 2 is characterized in that: The cross spline shaft (11) has four splines, wherein three splines have the same width, and one spline has a width greater than the widths of the remaining three splines.

5. The simplified on-load tap changer switching core assembly structure according to claim 1 is characterized in that: The transition contact (22), the contact (23) and the resistor plate (24) are fixed to the moving contact support plate (21) by means of bolts (3); the transition contact (22) is located at the front end of the moving contact support plate (21), the contacts (23) are symmetrically distributed on both sides of the transition contact (22), and the resistor plate (24) surrounds the rear end of the moving contact support plate (21).

6. The simplified on-load tap changer switching core assembly structure according to claim 5, characterized in that: The number of the moving contact groups (2) is three and they are sequentially spaced and sleeved on the outside of the main shaft (1).

7. The simplified on-load tap changer switching core assembly structure according to claim 6, characterized in that: The outer side of the main shaft (1) is provided with a bushing (4), and the bushing (4) is arranged above each group of moving contacts (2).

8. The simplified on-load tap changer switching core assembly structure according to claim 7, characterized in that: The bushing (4) is in a hollow cylindrical shape and is used to support the moving contact group (2) and ensure the spacing between each group of moving contact groups (2).

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