Novel switch contact structure

Abstract

The invention discloses a novel switch contact structure which comprises a support, a static contact and a moving contact assembly. A guide hole matched with the moving contact assembly is formed in the center of the support, the static contacts are symmetrically arranged on the support along the center position of the moving contact assembly, an eccentric mechanism is arranged in the moving contact assembly, and the moving contact assembly is conducted with the static contacts on the two sides under the action of external force. According to the scheme, the matching position of the eccentric rod and the square hole in the middle of the moving contact plate is provided with an eccentric structure which is in local smooth transition according to a specific angle, when the pull rod assembly slides downwards during closing, the moving contact is made to horizontally move and slide towards one side, and an oxidation film and dirt on the surface of the contact can be effectively removed.

Description

Technical Field

[0001] The present invention belongs to the technical field of medium-high voltage and large current isolating switches, and in particular relates to a novel switch contact structure. Background Art

[0002] Currently, the commonly used isolating switch contact structures in the switchgear industry are divided into bridge contact structures, knife-type contact structures, and plug-in contact structures. The bridge contact structure has the characteristics of good insulation performance, long life, and small size, and is widely used in medium-, high-voltage, and high-current switches.

[0003] However, the closing action of the bridge contact can usually only adopt a direct-acting structure, which makes it impossible for the contacts to achieve the self-cleaning function. The contacts are easily contaminated or oxidized, causing the contact resistance to increase and then heat and burn.

[0004] Currently, some switch manufacturers use elastic conductive materials in low-current bridge contacts to achieve a self-cleaning function by sliding the contacts. However, elastic conductive materials cannot stably carry high currents, and when high currents are connected, they can easily cause contact deformation or welding. High-current bridge contacts, on the other hand, have always struggled to achieve self-cleaning, requiring frequent cleaning and maintenance. This results in the switch being unable to carry stable current over the long term, resulting in high maintenance costs and a significant safety hazard. Summary of the Invention

[0005] The purpose of the present invention is to provide a new switch contact structure to address the above-mentioned shortcomings, which solves the problem in the prior art that large current bridge contacts are difficult to achieve self-cleaning function, require frequent cleaning and maintenance of contacts, resulting in the switch being unable to carry current stably for a long time, high maintenance costs, and safety hazards.

[0006] The present invention is achieved through the following solutions:

[0007] A novel switch contact structure comprises a support, a static contact and a moving contact assembly; a guide hole cooperating with the moving contact assembly is provided at the center of the support, the static contact is symmetrically arranged on the support along the center position of the moving contact assembly, and an eccentric mechanism is provided in the moving contact assembly. When the moving contact assembly is subjected to external force, it is connected with the static contacts on both sides, and the contact surface is cleaned by the eccentric mechanism.

[0008] Based on the above-mentioned new switch contact structure, the support includes a first connecting plate, a second connecting plate and a receiving plate; on both sides of the receiving plate arranged on opposite sides of the first connecting plate and the second connecting plate, the upper end surfaces of the first connecting plate and the second connecting plate protrude from the plate surface of the receiving plate by a predetermined distance, so that the receiving plate is embedded in the first connecting plate and the second connecting plate; the receiving plate includes a first end plate, a second end plate and a guide hole; the guide hole is arranged at the center position of the first end plate and the second end plate, and the first end plate and the second end plate are provided with a first sinking hole connected to the static contact; an auxiliary plate is also provided at the bottom of the guide hole.

[0009] Based on the above-mentioned new switch contact structure, a matching block is provided at the bottom of the support, and a U-shaped groove is provided in the matching block for use with the moving contact assembly; the U-shaped groove and the guide hole cooperate to enable the moving contact assembly as a whole to move in a predetermined direction.

[0010] Based on the above-mentioned new switch contact structure, the static contact includes a first conductive plate and a second conductive plate; the first guide plate is arranged perpendicular to the second conductive plate, and the connection between the first conductive plate and the second conductive plate is an arc transition. A mounting hole is provided on the second conductive plate, which is connected to the first sinking hole as a whole by a bolt passing through the mounting seat, and a static contact piece is provided on the end surface of the second conductive plate away from the first conductive plate.

[0011] Based on the above-mentioned new switch contact structure, the moving contact assembly includes a moving contact, an insulating pull rod, an eccentric rod and an end cover; one end of the eccentric rod is embedded in the insulating pull rod, the insulating pull rod is arranged in the guide rod, the top end of the eccentric rod is connected to the end cover, the moving contact is provided with a through hole connected to the eccentric rod, the eccentric rod between the end cover and the moving contact is provided with a connecting spring, and the moving contact is fixed to the upper end of the eccentric rod through the connecting spring.

[0012] Based on the above-mentioned novel switch contact structure, movable contact pieces are provided at the contact portions between the two ends of the bottom of the movable contact and the stationary contact piece.

[0013] Based on the above-mentioned new switch contact structure, the upper part of the insulating pull rod is provided with a threaded hole that cooperates with the eccentric rod, and the bottom thereof is provided with a connecting through hole. A positioning shaft is provided in the connecting through hole, and a bearing is sleeved on the outer side of the positioning shaft. The bottom of the insulating pull rod is slidably set in the U-shaped groove through the positioning shaft and the bearing; the bottom of the moving contact is in contact with the upper end part of the insulating pull rod, and the connecting spring provides downward contact pressure for the moving contact.

[0014] Based on the above-mentioned new switch contact structure, the end cover is provided with an eccentric hole and a sunken groove that cooperate with the end of the eccentric rod; the end of the eccentric rod is provided with a pin hole, and the pin hole is connected to the end cover through a pin; the pin is arranged in the sunken groove.

[0015] Based on the above-mentioned new switch contact structure, the eccentric rod includes a first support rod, a second support rod and an eccentric structure; the two ends of the eccentric structure are respectively connected to the first support rod and the second support rod; the eccentric structure is a structure with a local smooth transition at a predetermined angle; a square hole is provided in the center of the moving contact, and the eccentric structure can flexibly slide on the inner wall of the square hole in the center of the moving contact.

[0016] Based on the above-mentioned new switch contact structure, the lower part of the end cover is provided with a countersunk hole for connecting the upper part of the spring for installation and positioning, and the connecting spring is installed obliquely between the end cover and the moving contact; the upper part of the moving contact plate is provided with an eccentric countersunk hole for installation and positioning of the lower part of the spring.

[0017] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0018] 1) The static and moving contacts are installed independently, making installation and maintenance easier. The pull rod assembly is fitted with a shaft hole on the upper part of the support, while the lower part uses a U-shaped groove to ensure smooth guidance during contact opening and closing, while preventing the moving contact from rotating.

[0019] 2. The eccentric rod and the square hole in the middle of the moving contact plate have an eccentric structure with a local smooth transition at a specific angle. When closing the circuit breaker, the pull rod assembly slides downward while the moving contact slides to one side, which can effectively remove the oxide film and dirt on the contact surface.

[0020] 3. There is an eccentric countersunk hole on the upper part of the moving contact plate, and the square hole in the middle of the end cover has a specific eccentric structure, so that the spring is installed on the moving contact at an angle, so that one side of the square hole in the middle of the moving contact plate is close to the side of the eccentric rod.

[0021] 4. The moving contact piece adopts arc shape, and the contact part between the eccentric rod and the moving contact plate has arc transition, which can effectively reduce the resistance of the moving contact to translational sliding.

[0022] 5. A groove is provided on the upper part of the end cover to quickly disassemble and assemble the pin shaft, while reducing the volume of the contact structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a cross-sectional view of the overall structure of the present invention;

[0025] Figure 3 1. It is a structural diagram of the moving contact assembly;

[0026] Figure 4 It is a schematic diagram of the connection structure of the eccentric rod and the insulating pull rod;

[0027] Reference numerals: 1, support; 2, static contact; 3, moving contact assembly; 11, guide hole; 12, first connecting plate; 13, second connecting plate; 14, receiving plate; 15, first end plate; 16, second end plate; 17, matching block; 151, first connecting horizontal plate; 152, first connecting vertical plate; 153, first receiving horizontal plate; 154, first mounting hole; 161, second connecting horizontal plate; 162, second connecting vertical plate; 163, second receiving horizontal plate; 164, second mounting hole; 16 5. First sinking hole; 171. U-shaped groove; 21. First conductive plate; 22. Second conductive plate; 23. Static contact; 31. Moving contact; 32. Insulating pull rod; 33. Eccentric rod; 34. End cover; 35. Connecting spring; 36. Moving contact; 37. Connecting through hole; 38. Positioning shaft; 39. Bearing; 311. Eccentric sinking hole; 341. Eccentric hole; 342. Sinking groove; 331. Pin hole; 332. First support rod; 333. Second support rod; 334. Eccentric structure. DETAILED DESCRIPTION

[0028] All features disclosed in this specification, or all steps in the disclosed methods or processes, except mutually exclusive features and / or steps, can be combined in any manner.

[0029] Any feature disclosed in this specification (including any appended claims and abstract), unless otherwise stated, may be replaced by other equivalent or similar features. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0030] In the description of the present invention, it should be understood that the terms "up", "down", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a predetermined direction, be constructed and operated in a predetermined direction, and therefore cannot be understood as a limitation on the present invention.

[0031] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features being referred to. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of such features.

[0032] Example 1

[0033] like Figures 1 to 4 As shown, the present invention provides a technical solution:

[0034] A new type of switch contact structure, which at least includes but is not limited to a support 1, a static contact 2 and a moving contact assembly 3; a guide hole 11 is provided at the center of the support 1 for cooperating with the moving contact assembly 3, the static contact 2 is symmetrically arranged on the support 1 along the center position of the moving contact assembly 3, and an eccentric mechanism is provided in the moving contact assembly 3. When the moving contact assembly 3 is subjected to external force, it is connected with the static contacts 2 on both sides, and the contact surface is cleaned by the eccentric mechanism.

[0035] Based on the above structure, the static contact 2 and the moving contact assembly 3 in this solution are installed independently, which is convenient for installation and subsequent maintenance. At the same time, the eccentric mechanism provided in this solution can enable the static contact 2 to slide laterally during the contact process, thereby forcing the oxide film and dirt on the contact surface to be removed, so that the switch can carry current stably for a long time, reducing the difficulty of subsequent maintenance, and performing self-cleaning during use.

[0036] As an example, the support 1 may include a first connecting plate 12, a second connecting plate 13 and a receiving plate 14; on both sides of the receiving plate 14 arranged on opposite sides of the first connecting plate 12 and the second connecting plate 13, the upper end surfaces of the first connecting plate 12 and the second connecting plate 13 protrude from the plate surface of the receiving plate 14 by a predetermined distance, so that the receiving plate 14 is embedded in the first connecting plate 12 and the second connecting plate 13.

[0037] Based on the above structure, by arranging the receiving plate 14 in an embedded manner, the assembly point between the static contact 2 and the receiving plate 14 and the contact part between the static contact 2 and the moving contact assembly 3 can be protected to avoid current breakdown during the bridge process.

[0038] As an example, the receiving plate 14 may include a first end plate 15, a second end plate 16, and a guide hole 11; the guide hole 11 is provided at the center of the first end plate 15 and the second end plate 16, and a first sinking hole 165 connected to the static contact 2 is provided on the first end plate 15 and the second end plate 16; an auxiliary plate is further provided at the bottom of the guide hole 11;

[0039] Based on the above structure, by setting sinking holes on the first end plate 15 and the second end plate 16, the entire static contact 2 can be connected more tightly to the receiving plate 14, and by setting an auxiliary plate, the support of the first connecting plate 12 and the second connecting plate 13 can be strengthened.

[0040] As an example, the first end plate 15 can specifically include a first connecting horizontal plate 151, a first connecting vertical plate 152 and a first receiving horizontal plate 153; the first connecting horizontal plate 151 and the first receiving horizontal plate 153 are respectively arranged on both sides of the first connecting vertical plate 152, and the end of the first connecting horizontal plate 151 is perpendicular to the end of the first connecting vertical plate 152. The first receiving horizontal plate 153 is arranged on the first connecting vertical plate 152 near the center position, and a first mounting hole 154 that cooperates with the outside world is also provided on the first connecting horizontal plate 151.

[0041] The second end plate 16 can specifically include a second connecting horizontal plate 161, a second connecting vertical plate 162 and a second receiving horizontal plate 163; the second connecting horizontal plate 161 and the second receiving horizontal plate 163 are respectively arranged on both sides of the second connecting vertical plate 162, and the end of the second connecting horizontal plate 161 is perpendicular to the end of the second connecting vertical plate 162. The second receiving horizontal plate 163 is arranged on the second connecting vertical plate 162 near the center position, and a second mounting hole 164 that cooperates with the outside world is also provided on the second connecting horizontal plate 161.

[0042] Based on the above structure, by setting the first end plate 15 and the second end plate 16 as special-shaped structures, it is possible to quickly assemble with the outside while ensuring the structural stability of the receiving plate 14, making the entire structure more compact.

[0043] As an example, a mating block 17 is provided at the bottom of the support 1, and a U-shaped groove 171 is provided in the mating block 17 for use with the moving contact assembly 3; the U-shaped groove 171 and the guide hole 11 can cooperate to make the moving contact assembly 3 move as a whole in a predetermined direction, thereby ensuring accuracy during the movement process.

[0044] As an example, the static contact 2 may include a first conductive plate 21 and a second conductive plate 22; the first guide plate is arranged perpendicular to the second conductive plate 22, and has an arc transition at the connection between the first conductive plate 21 and the second conductive plate 22; a mounting hole is provided on the second conductive plate 22, and is integrally connected to the first sinking hole 165 by a bolt passing through the mounting seat; a static contact piece 23 is provided on the end surface of the second conductive plate 22 away from the first conductive plate 21;

[0045] Based on the above structure, the arc transition between the first conductive plate 21 and the second conductive plate 22 can avoid tip discharge and make the entire conductive process safer. At the same time, a static contact piece 23 is provided on the second conductive plate 22, which can safely connect the power to the moving contact assembly 3.

[0046] As an example, the moving contact assembly 3 may include a moving contact 31, an insulating pull rod 32, an eccentric rod 33 and an end cover 34; one end of the eccentric rod 33 is embedded in the insulating pull rod 32, the insulating pull rod 32 is arranged in the guide rod, the top end of the eccentric rod 33 is connected to the end cover 34, a through hole connected to the eccentric rod 33 is provided in the moving contact 31, and a connecting spring 35 is provided on the eccentric rod 33 between the end cover 34 and the moving contact 31, and the moving contact 31 is fixed to the upper end of the eccentric rod 33 through the connecting spring 35.

[0047] Based on the above structure, when the end cover 34 and the eccentric rod 33 move downward under external force, the moving contact 31 moves downward synchronously and contacts the static contact piece 23 to achieve conductivity. Due to the eccentric structure 334 of the eccentric rod 33, when it continues to be subjected to downward force, the spring is compressed, and the eccentric rod 33 will force the moving contact 31 to have a relative sliding relative to the static contact piece 23, that is, to clean the connection.

[0048] As an example, movable contact pieces 36 are provided at the contact portions between the two ends of the bottom of the movable contact 31 and the static contact piece 23 ; the movable contact piece 36 can better contact the static contact piece 23 .

[0049] As an example, the upper part of the insulating pull rod 32 is provided with a threaded hole that cooperates with the eccentric rod 33, and the bottom thereof is provided with a connecting through hole 37, a positioning shaft 38 is provided in the connecting through hole 37, and a bearing 39 is sleeved on the outside of the positioning shaft 38. The bottom of the insulating pull rod 32 is slidably set in the U-shaped groove 171 through the positioning shaft 38 and the bearing 39.

[0050] Based on the above structure, by setting a bearing 39 on the outside of the positioning shaft 38, the moving contact assembly 3 can make flexible up and down linear motion in the support 1. At the same time, a threaded hole is set at the top of the insulating pull rod 32, which can be quickly connected to the eccentric rod 33, reducing the difficulty of subsequent maintenance.

[0051] As an example, the bottom of the moving contact 31 contacts the upper end of the insulating pull rod 32, and the connection spring 35 provides downward contact pressure for the moving contact 31, making the power connection more stable.

[0052] As an example, the end cover 34 is provided with an eccentric hole 341 and a sunken groove 342 that cooperate with the end of the eccentric rod 33; the end of the eccentric rod 33 is provided with a pin hole 331, which is connected to the end cover 34 through a pin; the pin is set in the sunken groove 342.

[0053] Based on the above structure, the sunken groove 342 is provided to facilitate the installation of the eccentric rod 33 and the eccentric hole 341 , so that the eccentric rod 33 and the end cover 34 are connected as a whole.

[0054] As an example, the eccentric hole 341 is a square hole; the cross section of the eccentric rod 33 is a directional structure.

[0055] As an example, the eccentric rod 33 may include a first support rod 332, a second support rod 333 and an eccentric structure 334; the two ends of the eccentric structure 334 are respectively connected to the first support rod 332 and the second support rod 333; the eccentric structure 334 is a structure with a local smooth transition at a predetermined angle; a square hole is provided in the center of the moving contact 31, and the eccentric structure 334 can slide flexibly on the inner wall of the square hole in the center of the moving contact 31.

[0056] As an example, a countersunk hole is provided at the lower part of the end cover 34 for installation and positioning of the upper part of the connecting spring 35, and the connecting spring 35 is installed obliquely between the end cover 34 and the moving contact 31; an eccentric countersunk hole 311 is provided at the upper part of the moving contact 31 plate for installation and positioning of the lower part of the spring.

[0057] In actual application of this solution, the support 1 is installed on the frame of the switch, the operating mechanism is connected to the connecting rod assembly through the positioning shaft 38, and the moving contact 31 is kept in close contact with one side of the eccentric rod 33 under the action of the lateral reset force of the spring.

[0058] When the switch is closed, the switch operating mechanism drives the moving contact assembly 3 to move linearly downward. When the moving contact 31 and the static contact 2 just come into contact, the moving contact 31 stops moving downward, and the eccentric rod 33 drives the end cover 34 to continue to compress the spring downward to the required contact overtravel, while pushing the moving contact 31 to one side for horizontal translation. The contact achieves self-cleaning while obtaining contact pressure.

[0059] When the switch is opened, the switch operating mechanism drives the moving contact assembly 3 to move linearly upward, and the eccentric rod 33 drives the end cover 34 to release the compression spring to the initial contact pressure. At the same time, the moving contact 31 returns to its initial position laterally under the action of the spring's lateral restoring force.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A new switch contact structure, characterized in that: It includes a support, a static contact and a moving contact assembly; a guide hole is provided at the center of the support to cooperate with the moving contact assembly, the static contact is symmetrically arranged on the support along the center position of the moving contact assembly, and an eccentric mechanism is provided in the moving contact assembly. When the moving contact assembly is subjected to external force, it is connected with the static contacts on both sides, and the contact surface is cleaned by the eccentric mechanism.

2. The novel switch contact structure according to claim 1, characterized in that: The support includes a first connecting plate, a second connecting plate and a receiving plate; on both sides of the receiving plate arranged on opposite sides of the first connecting plate and the second connecting plate, the upper end surfaces of the first connecting plate and the second connecting plate protrude from the plate surface of the receiving plate by a predetermined distance, so that the receiving plate is embedded in the first connecting plate and the second connecting plate; the receiving plate includes a first end plate, a second end plate and a guide hole; the guide hole is arranged at the center position of the first end plate and the second end plate, and the first end plate and the second end plate are provided with a first sinking hole connected to the static contact; an auxiliary plate is also provided at the bottom of the guide hole.

3. A novel switch contact structure according to claim 1 or 2, characterized in that: A matching block is provided at the bottom of the support, and a U-shaped groove for matching with the moving contact assembly is provided in the matching block; the U-shaped groove and the guide hole cooperate to enable the moving contact assembly as a whole to move in a predetermined direction.

4. A novel switch contact structure according to claim 1 or 2, characterized in that: The static contact includes a first conductive plate and a second conductive plate; the first guide plate is arranged perpendicular to the second conductive plate, and the connection between the first conductive plate and the second conductive plate is an arc transition; a mounting hole is provided on the second conductive plate, which is connected to the first sinking hole as a whole by a bolt passing through the mounting seat; a static contact piece is provided on the end surface of the second conductive plate away from the first conductive plate.

5. A novel switch contact structure according to claim 1 or 2, characterized in that: The moving contact assembly includes a moving contact, an insulating pull rod, an eccentric rod and an end cover; one end of the eccentric rod is embedded in the insulating pull rod, the insulating pull rod is arranged in the guide rod, the top end of the eccentric rod is connected to the end cover, the moving contact is provided with a through hole connected to the eccentric rod, the eccentric rod between the end cover and the moving contact is provided with a connecting spring, and the moving contact is fixed to the upper end of the eccentric rod through the connecting spring.

6. The novel switch contact structure according to claim 5, characterized in that: The contact parts between the two ends of the bottom of the moving contact and the static contact are provided with moving contact pieces.

7. The novel switch contact structure according to claim 6, characterized in that: The upper part of the insulating pull rod is provided with a threaded hole that cooperates with the eccentric rod, and the bottom thereof is provided with a connecting through hole. A positioning shaft is provided in the connecting through hole, and a bearing is sleeved on the outer side of the positioning shaft. The bottom of the insulating pull rod is slidably set in the U-shaped groove through the positioning shaft and the bearing; the bottom of the moving contact is in contact with the upper end part of the insulating pull rod, and the connecting spring provides downward contact pressure for the moving contact.

8. The novel switch contact structure according to claim 7, characterized in that: The end cover is provided with an eccentric hole and a sunken groove that match the end of the eccentric rod; the end of the eccentric rod is provided with a pin hole, and the pin hole is connected to the end cover through a pin; the pin is set in the sunken groove.

9. The novel switch contact structure according to claim 8, characterized in that: The eccentric rod includes a first support rod, a second support rod and an eccentric structure; the two ends of the eccentric structure are respectively connected to the first support rod and the second support rod; the eccentric structure is a structure with a local smooth transition at a predetermined angle; a square hole is provided in the center of the moving contact, and the eccentric structure can flexibly slide on the inner wall of the square hole in the center of the moving contact.

10. The novel switch contact structure according to claim 9, characterized in that: The lower part of the end cover is provided with a countersunk hole for mounting and positioning the upper part of the connecting spring, and the connecting spring is installed obliquely between the end cover and the moving contact; the upper part of the moving contact plate is provided with an eccentric countersunk hole for mounting and positioning the lower part of the spring.

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