Contact structure for AC high voltage detection

Abstract

The invention discloses a contact structure for alternating-current high-voltage detection, and belongs to the technical field of electric power accessories, the contact structure comprises a first supporting piece, a second supporting piece and a plurality of contact pieces, the plurality of contact pieces are circumferentially arranged on the first supporting piece and the second supporting piece at equal intervals to form a plum blossom contact, and the outer surface of each contact piece is symmetrically provided with a first groove and a second groove. The first groove and the second groove are different in diameter, and a contact finger spring is arranged in the first groove or the second groove. The first groove with the large diameter and the second groove with the relatively small diameter are arranged, the grooves with different diameters can provide preset and accurate constraining force levels, the structural characteristics of the contact finger spring cannot be changed by using the grooves with different diameters, additional stress damage of the contact finger spring is effectively avoided, and by formulating standard maintenance regulations, the contact finger spring can be conveniently maintained, and the service life of the contact finger spring is prolonged. And the contact finger spring can be moved to different grooves according to service time or state inspection, so that planned maintenance instead of emergency repair is realized.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of power accessories, and particularly relates to a contact structure for alternating-current high-voltage detection. BACKGROUND

[0002] In order to prevent similar safety accidents, it is necessary to monitor the online state of the high-voltage cabinet in real time. Among them, the temperature collection and analysis of the plum blossom contact is one of the common means. The plum blossom contact is specifically composed of a support and a plurality of contact petals and springs arranged in a circle. The plum blossom contact petals are installed on the support and are clamped by the springs to make the plum blossom contact firmly connected to the moving contact arm. However, after a long time of use, the locking effect of the spring on the contact petals will decrease. Generally, the spring is replaced for maintenance. This operation is large in amount and complex in replacement, and the moving and static contacts need to be disconnected, so the efficiency is low.

[0003] A plum blossom contact disclosed in Chinese utility model patent CN217690827U is rotated by rotating the rotating disc, so that the threaded rod is rotated. The rotation of the threaded rod generates a pulling force on the fixed plate, and then the outer sleeve moves towards the inside of the inner sleeve. In this way, the spring is elongated to a certain extent, so that the spring restores the clamping elasticity of the contact petals. The structure is reasonable, the service life of the spring is prolonged, and the maintenance is convenient.

[0004] However, in the process of pulling the spring, the spring will deform, resulting in uneven distribution of pressure on the contact patch, causing some contact patches to be in good contact and other contact patches to be in poor contact. This will cause uneven distribution of current, and insufficient or uneven spring restraint force will cause the contact resistance to increase, causing local overheating, forming a vicious cycle, and eventually possibly causing the contact to burn out. SUMMARY

[0005] This section aims to summarize some aspects of the embodiments of the application and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of the specification to avoid obscuring the purpose of this section, the abstract and the title. Such simplifications or omissions cannot be used to limit the scope of the application.

[0006] To solve the problems in the background art, the application adopts the following technical solutions.

[0007] A contact structure for AC high voltage detection includes a first support plate, a second support plate, and multiple contact plates. The multiple contact plates are circumferentially and equidistantly arranged on the first and second support plates to form a staggered contact pattern. The outer surfaces of the contact plates are symmetrically provided with a first groove and a second groove, and the diameters of the first groove and the second groove are different. A contact finger spring is provided in the first groove or the second groove. A mounting groove is circumferentially provided on the inner wall of the first support plate, penetrating the outer wall of the first support plate and facing the inner surface of the lower end of the contact plate. A lever is rotatably provided in the mounting groove. The lever is inclined in the mounting groove, and the upper end of the lever extends out of the mounting groove. The upper ends of the multiple levers are jointly sleeved with a restraining spring. The ends of the levers abut against the inner surface of the lower end of the contact plate. The levers are constrained by the restraining springs and tend to rotate counterclockwise, so that the ends of the levers abut against the contact plate. The lower end of the contact plate tends to contract upward due to the resisting force, thereby achieving close contact between the contact plate and the stationary contact.

[0008] Preferably, the upper end of the lever is bent into a hook-shaped structure, and its restraining spring is sleeved on the hook-shaped structure. The end of the lever is connected to an abutment piece, and the abutment piece has a fan-shaped structure. The apex of the abutment piece abuts against the inner surface of the lower end of the abutment piece.

[0009] Preferably, the top of the contact piece protrudes to form a hammer head, and the hammer head protrudes from the inner surface of the second support piece. When multiple contact pieces are arranged in a circular pattern on the second support piece, the diameter of the circle formed by the connecting line of their hammer heads is smaller than the inner circle diameter of the second support piece.

[0010] Preferably, the inner surface of the hammer head is provided with a receiving groove, and a replacement block is slidably connected in the receiving groove. The replacement block is made of alloy material. A bolt is provided through the outer surface of the hammer head, and the end of the bolt is connected to the replacement block through a bearing. The bolt and the bearing are made of insulating material.

[0011] Preferably, a limiting protrusion is provided on the inner wall of the receiving groove, and a corresponding sliding groove is provided on the filling block, and the sliding groove is a closed structure at the front end of the filling block.

[0012] Preferably, the diameter of the first groove is larger than the diameter of the second groove, so that different constraint forces are formed on the contact piece by placing the contact finger spring in the first groove or the second groove.

[0013] Preferably, an overlapping block is provided on the inner side of the lower end of the contact piece, and the overlapping block overlaps the upper surface of the first support piece, with the front end of the overlapping block and the front end of the hammer head on the same plane.

[0014] Preferably, the first support plate and the second support plate are provided with circumferentially spaced slots, and the contact pieces are engaged in the slots.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The present invention is provided with a first groove with a larger diameter and a second groove with a relatively smaller diameter. Grooves with different diameters can provide preset and precise constraint force levels. Operators can select the appropriate groove position as needed, instead of stretching the finger spring based on experience. This makes the contact pressure more controllable and consistent. Furthermore, by placing the finger spring in the first groove or the second groove, different constraint forces can be formed. When the spring is used in the first groove for a long time and its elasticity weakens, it is transferred to the second groove. Since the diameter of the second groove is smaller, the diameter of the annular groove formed by the second groove is larger, so that the spring resumes contact with the contact piece. This method makes the pressure of the finger spring more uniform.

[0016] (2) The invention uses grooves of different diameters, which does not change the structural characteristics of the finger spring itself and effectively avoids additional stress damage to the finger spring. By formulating standard maintenance procedures, the finger spring can be moved to different grooves according to the usage time or condition inspection, so as to achieve planned maintenance rather than emergency repair.

[0017] (3) The design of the lever and the restraining spring in this invention makes the upper end of the contact piece tend to converge, ensuring that the contact piece is in close contact with the precision contact, improving the reliability of the electrical connection and reducing the arcing and heating phenomena caused by poor contact.

[0018] (4) The hammer structure formed by the protrusion at the top of the contact piece in this invention, together with the design of the filler block, gives the contact system a certain self-adaptive ability, which can compensate for mechanical tolerances and assembly errors. The filler block made of alloy material has high wear resistance and corrosion resistance, which extends the service life of the entire contact structure. The extension length of the filler block can be controlled by bolts, thereby compensating for wear differences. Attached Figure Description

[0019] Figure 1 This is a structural diagram of the plum blossom contact in this invention.

[0020] Figure 2 This is a partial structural diagram of the plum blossom contact in this invention.

[0021] Figure 3 This is a top view of the plum blossom contact in this invention.

[0022] Figure 4 This is a cross-sectional view of the plum blossom contact in this invention.

[0023] Figure 5 This is a half-sectional top view of the plum blossom contact in this invention.

[0024] Figure 6 This is a schematic diagram of the assembly of the support plate and the contact plate.

[0025] Figure 7 This is a structural diagram of the contact pad of the present invention.

[0026] Figure 8 This is a cross-sectional front view of the plum blossom contact in this invention.

[0027] Figure 9 In this invention Figure 8 A magnified view of part A.

[0028] The correspondence between the labels and component names in the attached figures is as follows: 100. First support plate; 1011. Mounting slot; 1012. Lever; 1013. Abutment plate; 1014. Restraint spring; 102. Second support plate; 103. Contact plate; 1031. First groove; 1032. Second groove; 1033. Hammer head; 1034. Receiving groove; 1035. Limiting protrusion; 1036. Filler block; 1037. Bolt; 1038. Overlapping block; 104. Contact finger spring; 105. Slot. Detailed Implementation

[0029] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0030] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0031] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that mutually excludes other embodiments. The present invention provides the following embodiments.

[0032] like Figures 1-3 As shown, this embodiment of an AC high voltage detection contact structure includes a first support plate 101, a second support plate 102, and multiple contact plates 103. In this embodiment, multiple contact plates 103 are arranged circumferentially and equidistantly on the first support plate 101 and the second support plate 102 to form a plum blossom contact. High voltage vacuum circuit breakers, high and low voltage disconnect switches, and SF6 load switches are commonly used in AC high voltage detection. The plum blossom contact plays a key role in these devices to ensure the normal operation and safety of the equipment. Therefore, this application optimizes the contact properties of the plum blossom contact, so that the equipment equipped with the plum blossom contact can better detect AC high voltage.

[0033] existFigure 1 and Figure 7 In this embodiment, a first groove 1031 and a second groove 1032 are symmetrically formed on the outer surface of the contact piece 103, and the diameters of the first groove 1031 and the second groove 1032 are different. A finger spring 104 is provided in the first groove 1031 or the second groove 1032. Therefore, by placing the finger spring 104 in the first groove 1031 or the second groove 1032, different constraint forces are formed on the contact piece 103. In this embodiment, based on the prior art, the grooves for mounting the finger spring 104 are set as the first groove 1031 and the second groove 1032 with different diameters. Specifically, the diameter of the first groove 1031 is larger than the diameter of the second groove 1032. When multiple contact pieces 103 are arranged circumferentially at equal intervals on the first support piece 10... When the first groove 1031 and the second groove 1032 are placed on the first and second support plates 102, they form two annular grooves with different diameters for mounting the finger spring 104. The annular groove formed by the first groove 1031 has a smaller diameter, while the annular groove formed by the second groove 1032 has a larger diameter. The inner diameter of the finger spring 104 is fixed in its natural state. When the finger spring 104 is used in the first groove 1031 for a long time and its elasticity weakens, it is transferred to the second groove 1032. The annular groove formed by the second groove 1031 has a larger diameter, thus restoring the supporting effect on the finger spring 104. Since the force is mutual, the finger spring 104 resumes its contact with the contact plate 103. This method makes the pressure of the finger spring 104 more uniform.

[0034] exist Figure 4 , Figure 8 and Figure 9In this embodiment, a mounting groove 1011 is circumferentially formed on the inner wall of the first support plate 101. The mounting groove 1011 penetrates the outer wall of the first support plate 101 and is directly opposite to the lower inner surface of the contact piece 103. A lever 1012 is rotatably mounted in the mounting groove 1011. The lever 1012 is inclined in the mounting groove 1011, and the upper end of the lever 1012 extends out of the mounting groove 1011. A restraining spring 1014 is sleeved on the upper ends of multiple levers 1012. The ends of the levers 1012 abut against the lower inner surface of the contact piece 103. In this embodiment, the lever 1012... 012 is first connected to the mounting slot 1011 via a shaft, allowing the lever 1012 to rotate at its mounting point. When the restraining spring 1014 is sleeved on the upper end of the lever 1012, the restraining spring 1014 functions similarly to the finger spring 104, compressing it to create an elastic pressure on the upper end of the lever 1012. This causes the lever 1012 to rotate counterclockwise under the constraint of the restraining spring 1014, resulting in the end of the lever 1012 contacting the contact piece 103. The lower end of the contact piece 103 is subjected to the contact force, causing the upper end to tend to contract, thereby achieving close contact between the contact piece 103 and the stationary contact.

[0035] Furthermore, when lever 1012 rotates due to the elastic force of restraint spring 1014, the diameter of the annular structure formed by the connecting lines between the ends of multiple levers 1012 shrinks at the upper end of lever 1012. To ensure that restraint spring 1014 can be well assembled with lever 1012, in this embodiment, the upper end of lever 1012 is bent into a hook-shaped structure, and the restraint spring 1014 is sleeved on the hook-shaped structure. The hook-shaped structure ensures that the restraint spring 1014 will not fall off lever 1012. Furthermore, due to the height of the mounting slot 1011... Because the lever 1012 has limited range of motion, the rotation range of the lever 1012 is restricted. To ensure that the end of the lever 1012 can effectively contact the contact piece 103 when it rotates, the end of the lever 1012 is connected to a contact piece 1013, which is a fan-shaped structure. The apex of the contact piece 1013 contacts the lower inner surface of the contact piece 103. In this embodiment, the fan-shaped contact piece 1013 can rotate a large range when the lever 1012 rotates a small range, thereby effectively contacting the lower inner surface of the contact piece 103.

[0036] exist Figure 6In this embodiment, an overlapping block 1038 is provided on the inner side of the lower end of the contact piece 103, and the overlapping block 1038 overlaps the upper surface of the first support piece 101. The front end of the overlapping block 1038 is on the same plane as the front end of the hammer head 1033. In this embodiment, the overlapping block 1038 can provide the contact piece 103 with an additional contact surface with the first support piece 101, ensuring that the slight expansion generated when the plum blossom contact is docked with the stationary contact will not cause the contact piece 103 to separate from the first support piece 101. In order to make the assembly between the contact piece 103, the first support piece 101 and the second support piece 102 more stable, in this embodiment, slots 105 are circumferentially and equidistantly provided on the first support piece 101 and the second support piece 102, and the contact piece 103 is locked in the slots 105.

[0037] In this embodiment, when the elastic force of the finger spring 104 weakens to a certain extent, the finger spring 104 cannot effectively compress the contact piece 103. When the plum blossom contact is connected to the stationary contact, the contact between the end of the contact piece 103 and the stationary contact is unstable. After the contact piece 1013 effectively abuts against the inner surface of the lower end of the contact piece 103, the lower end of the contact piece 103 will move outward. The contact point between the overlapping block 1038 on the contact piece 103 and the first support piece 101 forms a fulcrum, causing the upper end of the contact piece 103 to move inward and thus make close contact with the stationary contact. During this process, the contact piece 103 is constrained by the finger spring 104 and will not fall off the first support piece 101 and the second support piece 102.

[0038] exist Figures 5-7 In this embodiment, the top of the contact piece 103 protrudes to form a hammer head 1033, and the hammer head 1033 protrudes from the inner surface of the second support piece 102. When multiple contact pieces 103 are arranged in a circular pattern on the second support piece 102, the diameter of the circle formed by the connecting line of the hammer head 1033 is smaller than the inner circle diameter of the second support piece 102. In this embodiment, when the stationary contact is inserted into the plum blossom contact, the hammer head 1033 protruding from the second support piece 102 can effectively make small contact with the stationary contact, thereby ensuring normal power supply.

[0039] Furthermore, considering that after prolonged use, the contact point 103 of the stationary contact and the plum blossom contact will experience some wear, i.e., the hammer head 1033 in this embodiment, which will lead to a gap between the hammer head 1033 and the stationary contact, in order to ensure contact between the hammer head 1033 and the stationary contact, this embodiment provides a receiving groove 1034 on the inner surface of the hammer head 1033, and a replacement block 1036 is slidably connected in the receiving groove 1034. The replacement block 1036 is made of alloy material. The design of the hammer head 1033 plus the replacement block 1036 in this embodiment gives the contact system a certain degree of self-adaptability, which can compensate for mechanical tolerances and assembly errors. The alloy replacement block 1036 has high wear resistance and corrosion resistance, extending the service life of the entire plum blossom contact. Furthermore, in this embodiment, a bolt 1037 is provided through the outer surface of the hammer head 1033, and the end of the bolt 1037 is connected to the replacement block 1036 through a bearing. By rotating the bolt 1037, the replacement block 1036 can slide within the receiving groove 1034, thereby controlling the extension length of the replacement block 1036 to compensate for wear differences. At the same time, a limiting protrusion 1035 is provided on the inner wall of the receiving groove 1034, and a corresponding sliding groove is provided on the replacement block 1036. The sliding groove is a closed structure at the front end of the replacement block 1036. The limiting protrusion 1035 and the sliding groove ensure that the replacement block 1036 can be accurately positioned to prevent displacement during operation. The bolt 1037 and the bearing are made of insulating material to effectively isolate high voltage and improve the safety of equipment operation.

[0040] The above description, in conjunction with specific embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention, and all such deductions or substitutions should be considered to fall within the scope of protection defined by the claims submitted herein.

Claims

1. A contact structure for AC high voltage detection, comprising a first support plate (101), a second support plate (102), and a plurality of contact plates (103), wherein the plurality of contact plates (103) are circumferentially and equidistantly arranged on the first support plate (101) and the second support plate (102) to form a staggered contact pattern. Its features are: The outer surface of the contact piece (103) is symmetrically provided with a first groove (1031) and a second groove (1032), and the diameters of the first groove (1031) and the second groove (1032) are not equal. A finger spring (104) is provided in the first groove (1031) or the second groove (1032). The inner wall of the first support piece (101) is provided with a circumferentially shaped mounting groove (1011), which penetrates the outer wall of the first support piece (101) and is directly opposite to the lower inner surface of the contact piece (103). A lever (1012) is rotatably provided in the mounting groove (1011). The lever (1012) is inclined in the mounting slot (1011). The upper end of the lever (1012) extends out of the mounting slot (1011), and the upper ends of multiple levers (1012) are connected to a binding spring (1014). The end of the lever (1012) abuts against the lower inner surface of the contact piece (103). The lever (1012) is constrained by the binding spring (1014) and tends to rotate counterclockwise, so that the end of the lever (1012) abuts against the contact piece (103). The lower end of the contact piece (103) tends to contract upward under the abutting force, thereby achieving close contact between the contact piece (103) and the stationary contact.

2. The contact structure for AC high voltage detection according to claim 1, characterized in that: The upper end of the lever (1012) is bent into a hook-shaped structure, and its binding spring (1014) is sleeved on the hook-shaped structure.

3. The contact structure for AC high voltage detection according to claim 2, characterized in that: The lever (1012) is connected to an abutment piece (1013) at its end, and the abutment piece (1013) has a fan-shaped structure. The apex of the abutment piece (1013) abuts against the inner surface of the lower end of the contact piece (103).

4. The contact structure for AC high voltage detection according to claim 1, characterized in that: The top of the contact piece (103) protrudes to form a hammer head (1033), and the hammer head (1033) protrudes from the inner surface of the second support piece (102). When multiple contact pieces (103) are arranged in a circular pattern on the second support piece (102), the diameter of the circle formed by the connecting line of the hammer head (1033) is smaller than the inner circle diameter of the second support piece (102).

5. The contact structure for AC high voltage detection according to claim 4, characterized in that: The inner surface of the hammer head (1033) is provided with a receiving groove (1034), and a replacement block (1036) is slidably connected in the receiving groove (1034). The replacement block (1036) is made of alloy material. The outer surface of the hammer head (1033) is provided with a bolt (1037), and the end of the bolt (1037) is connected to the replacement block (1036) through a bearing. The bolt (1037) and the bearing are made of insulating material.

6. The contact structure for AC high voltage detection according to claim 5, characterized in that: The inner wall of the receiving groove (1034) is provided with a limiting protrusion (1035), and a corresponding sliding groove is provided on the replacement block (1036), and the sliding groove is a closed structure at the front end of the replacement block (1036).

7. The contact structure for AC high voltage detection according to claim 1, characterized in that: The diameter of the first groove (1031) is larger than the diameter of the second groove (1032). By placing the finger spring (104) in the first groove (1031) or the second groove (1032), different constraint forces are formed on the contact piece (103).

8. The contact structure for AC high voltage detection according to claim 1, characterized in that: The lower inner side of the contact piece (103) is provided with an overlapping block (1038), and the overlapping block (1038) overlaps the upper surface of the first support piece (101). The front end of the overlapping block (1038) and the front end of the hammer (1033) are on the same plane.

9. The contact structure for AC high voltage detection according to claim 1, characterized in that: The first support plate (101) and the second support plate (102) are provided with circumferentially spaced slots (105), and their contact pieces (103) are locked in the slots (105).

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