Disconnector contact structure

Abstract

The application discloses a disconnecting switch contact structure, which comprises a movable contact seat and a static contact seat arranged oppositely; a movable contact is arranged in the movable contact seat and the end of the movable contact is provided with a movable arc contact; a static arc contact is fixed in the static contact seat and arranged oppositely to the movable arc contact; a through hole is arranged on the static arc contact in the axial direction, and a movable cavity is formed between the base of the static arc contact and the static contact seat; the through hole is communicated to the movable cavity; a piston is movably matched in the movable cavity; at least one piston rod is arranged on one side of the piston, the piston rod is movably arranged in the base of the static arc contact and arranged oppositely to the movable contact; and at least one energy storage spring is arranged on the other side of the piston. The application can realize the arc extinguishing function by the mutual action of the movable contact and the static contact, and the opening speed is fast and the arc extinguishing capacity is strong.

Description

Technical Field

[0001] This invention relates to the field of arc extinguishing devices for disconnecting switches, and in particular to a contact structure for a disconnecting switch. Background Technology

[0002] A disconnecting switch is a switching device mainly used for isolating power supplies, switching operations, and connecting (or disconnecting) small current circuits. When in the open position, the disconnecting switch has an insulation distance between its contacts that meets the specified requirements and a clear disconnection mark; when in the closed position, it is a switching device that can carry current under normal circuit conditions and current under abnormal conditions (such as short circuits) for a specified time.

[0003] During the operation of disconnecting switches, there are conditions for switching busbar switching current and switching small capacitive current. When the moving and stationary contacts of the disconnecting switch are separated, an electric arc will be generated. The electric arc may not only burn the moving and stationary contacts, but also other internal components of the disconnecting switch, which is quite dangerous.

[0004] In existing technologies, disconnecting switches generally do not have a dedicated arc-extinguishing device. Instead, a special arc contact is designed on the moving and stationary contacts of the disconnecting switch to ignite the arc. When the moving and stationary contacts separate, the arc is transferred to the arc contact, preventing the arc from burning other components. As the moving and stationary contacts open, the distance between the arc contacts increases, the arc lengthens, and it cools down. Under certain distance conditions, the arc extinguishes at zero crossing. This design has the disadvantages of long arcing time and high contact burn-out. Furthermore, with larger breaking capacities and shorter opening distances, it may fail to complete the breaking process. At the same time, current technology requires miniaturization of disconnecting switches, and the required opening contact distance is becoming increasingly smaller, thus exacerbating this contradiction. Summary of the Invention

[0005] The purpose of this invention is to provide a disconnecting switch contact structure that can achieve arc extinguishing function by utilizing the interaction of moving and stationary contacts, and has fast opening speed and strong arc extinguishing capability.

[0006] To achieve the above objectives, the solution of the present invention is: A disconnector contact structure includes a movable contact seat and a stationary contact seat arranged opposite to each other; a retractable movable contact is provided inside the movable contact seat, and a moving arc contact is provided at the end of the movable contact; a stationary arc contact is fixed inside the stationary contact seat and is arranged opposite to the moving arc contact; a through hole is provided in the axial direction of the stationary arc contact, and a movable cavity is formed between the base of the stationary arc contact and the stationary contact seat; the through hole communicates with the movable cavity; a piston is movably fitted inside the movable cavity; at least one piston rod is provided on one side of the piston, and the piston rod movably passes through the base of the stationary arc contact and is arranged opposite to the movable contact; at least one energy storage spring is provided on the other side of the piston.

[0007] The base of the stationary arc contact, the stationary contact seat, and the piston form a variable-sized air chamber, the size of which changes as the moving contact contacts and separates from the piston rod.

[0008] The inner port of the through hole is flared.

[0009] Preferably, the outer port of the through hole is a constricted opening.

[0010] The moving contact seat is provided with a first mounting groove for assembling the moving contact, and the side wall of the first mounting groove is provided with a first spring contact finger for the moving contact to move and engage.

[0011] The end of the moving contact is provided with a second mounting groove, and the bottom of the moving arc contact is locked to the bottom of the second mounting groove by bolts.

[0012] The stationary contact seat is provided with a third mounting groove for assembling the stationary arc contact, and a second spring contact finger is provided at the outer end of the third mounting groove for the moving contact to move and engage.

[0013] Preferably, the piston is in a movable sealing fit with the side wall of the third mounting groove.

[0014] Preferably, the bottom of the third mounting groove is provided with a positioning groove for positioning and engaging the energy storage spring, one end of the energy storage spring is embedded in the positioning groove, and the other end is fixedly connected to the surface of the piston.

[0015] Preferably, the base of the static arc contact is fixedly connected to the side wall of the third mounting groove; the base is provided with a through hole for the piston rod to move through, and the circumferential surface of the piston rod is in a movable sealing fit with the side wall of the through hole.

[0016] By adopting the above technical solution, the present invention has the following technical effects: ① By setting a piston inside the stationary contact seat, a chamber is formed between the piston and the stationary contact seat, and the piston has a piston rod that passes through the base of the stationary arc contact. When the circuit is closed, the moving contact will push the piston to move through the piston rod, so that the volume of the chamber increases to store gas. When the circuit is opened, the piston is pushed by the energy storage spring to make the chamber smaller, and the gas in the chamber is compressed and flows out from the through hole, so that the arc generated when the moving arc contact and the stationary arc contact are separated is extinguished. Therefore, the arc extinguishing function can be achieved by using the closing and opening actions of the moving contact and the stationary contact. ②Based on this, the present invention does not require the design of an additional arc extinguishing device, has a simple structure and is easy to install, and the driving force for the arc extinguishing function is the mutual action of the moving and stationary contacts, which has high stability and durability, and can adapt to the requirements of miniaturization of disconnecting switches and small distance between opening contacts; ③ In the initial stage of opening, the pressure released by the energy storage spring can be applied to the piston rod through the piston, thereby accelerating the reverse movement of the moving contact and increasing the opening speed. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the tripped state in a specific embodiment of the present invention; Figure 2 This is a schematic diagram of the closed state in a specific embodiment of the present invention; Figure 3 This is a schematic diagram of the circuit breaker tripping process according to a specific embodiment of the present invention; Figure 4 for Figure 3 Enlarged view of point A in the middle; Explanation of icon numbers: 1----Moving contact base; 11---First mounting slot; 2----Stationary contact base; 21---Third mounting slot; 211--Positioning slot; 3----Moving contact; 31---Second mounting slot; 4----Moving arc contact; 5----Stabilizing arc contact; 51---Through hole; 511--Flanged opening; 512--Reduced opening; 52---Base; 521--Perforation; 6----Piston; 61---Piston rod; 7---Storage spring; 8---First spring contact finger; 9----Second spring contact finger; a----Moving chamber; b----Air chamber. Detailed Implementation

[0018] To further explain the technical solution of the present invention, the present invention will be described in detail below through specific embodiments.

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of protection of the invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of the embodiments of the present invention, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, or the orientation or positional relationship in which those skilled in the art are usually understood. It is only for the purpose of simplifying the description of the embodiments of the present invention, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present invention.

[0023] Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for mutual communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] The following disclosure provides many different embodiments or examples for implementing different structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0027] Furthermore, this invention provides examples of various specific processes and materials, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0028] refer to Figures 1 to 4 As shown, the present invention discloses a disconnector contact structure, including a moving contact 1 and a stationary contact 2 disposed opposite to each other; The movable contact 1 is provided with a retractable movable contact 3, and the end of the movable contact 3 is provided with a movable arc contact 4; A stationary contact 5 is fixed inside the stationary contact base 2 and is disposed opposite to the moving arc contact 4; a through hole 51 is provided in the axial direction of the stationary arc contact 5, and the base 52 of the stationary arc contact 5 and the stationary contact base 2 form a movable cavity a; the through hole 51 is connected to the movable cavity a. A piston 6 is movably fitted inside the movable cavity a; one side of the piston 6 is provided with at least one piston rod 61, which movably passes through the base 52 of the stationary arc contact 5 and is positioned opposite to the moving contact 3; the other side of the piston 6 is provided with at least one energy storage spring 7.

[0029] The following illustrates specific embodiments of the present invention.

[0030] The base 52 of the stationary arc contact 5, the stationary contact seat 2, and the piston 6 form a variable-sized air chamber b. The size of the air chamber b changes as the moving contact 3 contacts and separates from the piston rod 61: when the moving contact 3 extends, the moving contact 3 pushes the piston rod 61, causing the piston 6 to compress the energy storage spring 7 to store energy, and at the same time, the air chamber b increases in size and begins to store gas; when the moving contact 3 retracts, the energy storage spring 7 releases pressure energy to reset the piston 6, and the piston rod 61 pushes the moving contact 3 to retract faster, the air chamber b decreases, and the gas is pushed out from the through hole 51 and flows to the separation point of the moving arc contact 4 and the stationary arc contact 5.

[0031] The inner port of the aforementioned through hole 51 is a flared opening 511 (i.e., a bell mouth) so that when the gas chamber b supplies gas to the through hole 51, the gas accelerates into the through hole 51, thereby ejecting high-speed gas from the outer port of the through hole 51 and improving the arc extinguishing capability.

[0032] Furthermore, the outer port of the aforementioned through hole 51 is a constriction 512, which allows the gas to be further accelerated when flowing out of the through hole 51.

[0033] The aforementioned moving contact base 1 is provided with a first mounting groove 11 for assembling the moving contact 3. The side wall of the first mounting groove 11 is provided with a first spring contact finger 8 for the moving contact 3 to move and engage, so as to ensure the stability of the electrical connection between the moving contact base 1 and the moving contact 3 when energized.

[0034] The end of the moving contact 3 is provided with a second mounting groove 31, and the bottom of the moving arc contact 4 is fixed to the bottom of the second mounting groove 31 by bolts.

[0035] The aforementioned stationary contact base 2 is provided with a third mounting groove 21 for assembling the stationary arc contact 5. A second spring contact finger 9 is provided at the outer end of the third mounting groove 21 for the movable contact 3 to engage with, ensuring the stability of the electrical connection between the stationary contact base 2 and the movable contact 3 when energized. The space enclosed between the stationary arc contact 5 and the third mounting groove 21 is the aforementioned movable cavity.

[0036] Furthermore, the piston 6 is in a movable sealing fit with the side wall of the third mounting groove 21 to ensure airtightness. When the piston 6 is pushed back to its original position by the energy storage spring 7, the gas in the gas chamber b can only flow out through the through hole 51.

[0037] Furthermore, the bottom of the aforementioned third mounting groove 21 is provided with a positioning groove 211 for positioning and engaging the energy storage spring 7. One end of the energy storage spring 7 is embedded in the positioning groove 211, and the other end is fixedly connected to the surface of the piston 6 to ensure the stability of the working state of the energy storage spring 7.

[0038] Meanwhile, the base 52 of the aforementioned static arc contact 5 is fixedly connected to the side wall of the third mounting groove 21 to achieve a tight fit without gaps; the base 52 is provided with a through hole 521 for the piston rod 61 to move through, and the circumferential surface of the piston rod 61 is in a movable sealing fit with the side wall of the through hole 521.

[0039] refer to Figures 1 to 4 As shown, the working principle of this invention is as follows: ①See Figure 1 When the disconnecting switch is in the open state, under the action of the energy storage spring 7, the piston 6 is close to the base 52 of the static arc contact 5, and there is no gas in the gas chamber b. ②See also Figure 2 When the disconnector is in the closed state, the moving contact 3 pushes the piston 6 and compresses the energy storage spring 7 to the limit state, the energy storage spring 7 stores energy, and the gas chamber b stores gas. ③See Figure 3 and Figure 4 When the disconnecting switch is in the opening process, the moving contact 3 moves in the reverse direction. Figure 4(The thick arrow) retracts towards the moving contact 1, gradually relieving the pressure of the moving contact 3 on the piston rod 61. The energy storage spring 7 pushes the piston 6 back to the stationary arc contact 5. The piston 6 compresses the gas in the gas chamber b, increasing the pressure. The gas then... Figure 4 The movement is in the direction of the thin arrow; the moving arc contact 4 and the stationary arc contact 5 of the disconnecting switch separate, generating an electric arc. The high-pressure gas in the gas chamber b flows out through the through hole 51, the gas pressure decreases, the flow rate increases, and the electric arc is blown away, so as to realize the rapid recovery of the dielectric insulation strength between the contacts and the electric arc is extinguished.

[0040] Through the above scheme, the present invention sets a piston 6 inside the stationary contact seat 2, forming a chamber between the piston 6 and the stationary contact seat 2. The piston 6 has a piston rod 61 that passes through the base 52 of the stationary arc contact 5. When closing, the moving contact 3 pushes the piston 6 to move through the piston rod 61, making the volume of the chamber larger to store gas. When opening, the piston 6 is pushed by the energy storage spring 7, making the chamber smaller. The gas in the chamber is compressed and flows out from the through hole 51, thereby extinguishing the arc generated when the moving arc contact 4 and the stationary arc contact 5 separate. Therefore, the arc extinguishing function can be achieved by using the closing and opening actions of the moving contact 3 and the stationary contact. Based on this, the present invention does not require the design of an additional arc extinguishing device. The structure is simple and easy to install. The driving force for the arc extinguishing function is the mutual action of the moving and stationary contacts, which is highly stable and durable. It can also meet the requirements of miniaturization of disconnecting switches and small distance between opening contacts. In the initial stage of opening, the pressure released by the energy storage spring 7 can push the piston rod 61 through the piston 6, thereby accelerating the reverse movement of the moving contact 3 and increasing the opening speed.

[0041] The above embodiments and figures are not intended to limit the product form and style of the present invention. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of the present invention.

Claims

1. A disconnector contact structure, characterized in that: This includes the moving contact seat and the stationary contact seat that are arranged opposite to each other; The movable contact seat is provided with a retractable movable contact, and the end of the movable contact is provided with a movable arc contact; A stationary arc contact is fixed inside the stationary contact base and is disposed opposite to the moving arc contact; a through hole is provided in the axial direction of the stationary arc contact, and a movable cavity is formed between the base of the stationary arc contact and the stationary contact base; the through hole communicates with the movable cavity; A piston is movably fitted inside the movable cavity; one side of the piston is provided with at least one piston rod, which movably passes through the base of the stationary arc contact and is positioned opposite to the moving contact; at least one energy storage spring is provided on the other side of the piston. The base of the stationary arc contact, the stationary contact seat, and the piston form a variable-sized air chamber, the size of which changes as the moving contact contacts and separates from the piston rod.

2. The disconnector contact structure according to claim 1, characterized in that: The inner port of the through hole is flared.

3. The disconnector contact structure according to claim 2, characterized in that: The outer port of the through hole is narrowed.

4. The disconnector contact structure according to claim 1, characterized in that: The moving contact seat is provided with a first mounting groove for assembling the moving contact, and the side wall of the first mounting groove is provided with a first spring contact finger for the moving contact to move and engage.

5. The disconnector contact structure according to claim 1, characterized in that: The end of the moving contact is provided with a second mounting groove, and the bottom of the moving arc contact is locked to the bottom of the second mounting groove by bolts.

6. The disconnector contact structure according to claim 1, characterized in that: The stationary contact seat is provided with a third mounting groove for assembling the stationary arc contact, and a second spring contact finger is provided at the outer end of the third mounting groove for the moving contact to move and engage.

7. The disconnector contact structure according to claim 6, characterized in that: The piston is in a movable sealing fit with the side wall of the third mounting groove.

8. The disconnector contact structure according to claim 6, characterized in that: The bottom of the third mounting groove is provided with a positioning groove for positioning and engaging the energy storage spring. One end of the energy storage spring is embedded in the positioning groove, and the other end is fixedly connected to the surface of the piston.

9. The disconnector contact structure according to claim 6, characterized in that: The base of the static arc contact is fixedly connected to the side wall of the third mounting groove; the base is provided with a through hole for the piston rod to move through, and the circumferential surface of the piston rod is in a movable sealing fit with the side wall of the through hole.

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