Arc extinguishing chamber and high-speed dc switch

Abstract

The application relates to an arc extinguishing chamber and a high-speed direct current switch. The arc extinguishing chamber comprises a sleeve and a moving contact assembly. The moving contact assembly comprises a moving support, a pressure cylinder, a moving contact, a moving arc contact and a moving contact rod for connecting with a driving mechanism. The moving support is inserted into a receiving cavity and connected with one end of the sleeve provided with a first opening. The moving support is provided with an inner hole extending along the axial direction of the moving support. The moving contact rod is movably inserted into the inner hole. The moving arc contact is mounted on the end of the moving contact rod away from the driving mechanism and coaxially arranged with the moving contact rod. The moving contact is sleeved on the moving arc contact and connected with the moving contact rod. The pressure cylinder is sleeved on the moving contact and the moving support. The pressure cylinder is fixedly connected with the moving contact and slidably connected with the moving support. The pressure cylinder, the moving contact and the moving contact rod surround to form an airflow space. The moving contact is provided with an airflow hole in communication with the airflow space. The airflow hole on the side of the moving contact close to the moving support extends to the side of the moving contact away from the moving support in the direction close to the moving arc contact.

Description

Technical Field

[0001] This invention relates to the field of power switch technology, and in particular to an arc-extinguishing chamber and a DC high-speed switch. Background Technology

[0002] With the in-depth research and construction of new power systems, DC systems will transition from the traditional "end-to-end" form to a "multi-end" form, eventually forming a "DC grid." Multi-end DC and DC grids, due to their stronger transmission capacity and more flexible operation, can effectively solve the problems of multiple power sources and multiple power delivery points, and will become one of the effective technical means to address the shortage of power transmission corridors and the large-scale grid connection of renewable energy in China.

[0003] High-speed DC switches (HSS) are key equipment in multi-terminal DC and even DC power grids. They are used for the on-line commissioning and decommissioning of third stations at the load end and for the rapid isolation of DC line faults, playing a crucial role in supporting the flexible and reliable operation of DC systems. The arc-extinguishing chamber is one of the core components of a high-speed DC switch. Through the excellent insulation of the vacuum inside the chamber, it enables rapid arc extinguishing and current suppression after the power supply to medium- and high-voltage circuits is cut off, preventing accidents and incidents. However, common arc-extinguishing chambers have relatively weak breaking capacity for small DC currents. Summary of the Invention

[0004] Therefore, it is necessary to provide an arc-extinguishing chamber and a high-speed DC switch that can improve the ability to interrupt small DC currents.

[0005] An arc-extinguishing chamber, comprising:

[0006] A sleeve, the sleeve having a receiving cavity and a first opening communicating with the receiving cavity;

[0007] A moving contact assembly includes a moving support, a pressure cylinder, a moving contact, a moving arc contact, and a moving contact rod for connection with a drive mechanism. The moving support is inserted into the receiving cavity and connected to the end of the sleeve with the first opening. The moving support has an inner hole extending axially along the moving support, and the moving contact rod is movably inserted into the inner hole. The moving arc contact is mounted on the end of the moving contact rod away from the drive mechanism and is coaxially arranged with the moving contact rod. The moving contact sleeve... A pressure cylinder is disposed on the moving arc contact and connected to the moving contact rod; the pressure cylinder is sleeved on the moving contact and the moving support, the pressure cylinder is fixedly connected to the moving contact and slidably connected to the moving support, the pressure cylinder, the moving contact and the moving contact rod surround to form an airflow space, the moving contact is provided with an airflow hole communicating with the airflow space, the airflow hole extends obliquely from the side of the moving contact near the moving support toward the side of the moving contact away from the moving support.

[0008] In one embodiment, the angle between the axis of the airflow hole and the axis of the moving contact is 25° to 45°.

[0009] In one embodiment, the airflow hole is an oblong hole that extends circumferentially along the moving contact; there are two airflow holes, both of which are oblong holes, and the two airflow holes are spaced apart circumferentially along the moving contact and are symmetrically arranged about a plane passing through the central axis of the moving contact.

[0010] In one embodiment, the moving contact assembly further includes a nozzle, which is connected to the side of the moving contact away from the moving support. The airflow hole is located inside the nozzle, and the end of the moving arc contact away from the moving contact rod is inserted into the nozzle.

[0011] In one embodiment, the nozzle includes a first nozzle segment, a second nozzle segment, a third nozzle segment, and a fourth nozzle segment connected in sequence. The first nozzle segment extends from the moving contact along the axial direction of the moving arc contact in a direction away from the moving contact. The second nozzle segment is inclined from the side of the first nozzle segment away from the moving contact in an axial direction closer to the moving arc contact. The third nozzle segment extends from the side of the second nozzle segment away from the first nozzle segment along the axial direction of the moving arc contact. The fourth nozzle segment is inclined from the side of the third nozzle segment away from the second nozzle segment in an axial direction away from the moving arc contact. The end of the moving arc contact away from the moving contact rod is inserted into the first nozzle segment, and an airflow channel communicating with the airflow hole is formed between the moving arc contact and the first nozzle segment at an interval.

[0012] In one embodiment, the diameter of the third nozzle section is 30mm to 40mm, and the included angle between the fourth nozzle section and the axis of the moving arc contact is 5° to 10°.

[0013] In one embodiment, the outer peripheral surface of the movable support is provided with a guide groove, and the movable contact assembly further includes a guide ring disposed in the guide groove. The air cylinder is guided and engaged with the movable support through the guide ring. The movable contact assembly further includes a first elastic ring disposed in the guide groove, and the guide ring is disposed outside the first elastic ring.

[0014] In one embodiment, the outer circumferential surface of the movable support is provided with a sealing groove, and the movable contact assembly further includes a sealing ring, which is disposed in the sealing groove, and the air cylinder is sealed to the movable support through the sealing ring.

[0015] In one embodiment, the sleeve has a second opening opposite to the first opening; the arc-extinguishing chamber further includes a stationary contact assembly, which includes a stationary support, a stationary arc contact, and a stationary contact. The stationary support is inserted into the receiving cavity and connected to the end of the sleeve with the second opening. The stationary arc contact and the stationary contact are both mounted on the side of the stationary support facing the moving contact assembly. The stationary arc contact and the moving arc contact are coaxially arranged, and the stationary contact surrounds the stationary arc contact.

[0016] In one embodiment, the stationary contact includes a second elastic ring and a plurality of stationary contact bodies. The plurality of stationary contact bodies are arranged circumferentially along the stationary support. Each of the plurality of stationary contact bodies has a through hole at one end near the stationary support. The second elastic ring passes through the through hole of each of the stationary contact bodies. The plurality of stationary contact bodies are clamped to the outer peripheral surface of the stationary support facing the moving contact assembly by the second elastic ring.

[0017] In one embodiment, the stationary contact assembly further includes a shield, which is coaxially arranged with and connected to the stationary support, and the shield covers the stationary contact.

[0018] In one embodiment, the stationary contact assembly further includes an elastic element disposed between the stationary contact and the shield. Multiple elastic elements are provided, and each elastic element corresponds to a stationary contact body. One end of the elastic element abuts against the outer peripheral surface of the stationary contact body, and the other end abuts against the inner peripheral surface of the shield.

[0019] In one embodiment, the outer peripheral surface of the stationary support facing the moving contact assembly is provided with a first step and a second step. The first step is closer to the outer peripheral surface of the stationary support than the second step. One end of the shield is installed on the first step, and the end of the shield away from the stationary support is provided with a mounting groove. One end of the stationary contact is installed on the second step, and the other end is inserted into the mounting groove.

[0020] A DC high-speed switch includes an insulating support, a drive mechanism, and an arc-extinguishing chamber. The drive mechanism is mounted on the insulating support and is connected to the moving contact rod.

[0021] In the aforementioned arc-extinguishing chamber and DC high-speed switch, during closing, the moving contact rod, driven by the drive mechanism, moves the pressure cylinder, moving contact, and moving arc contact away from the first opening. During the closing motion, the moving arc contact generates an electric arc. Simultaneously, the airflow space formed by the pressure cylinder, moving contact, and moving contact rod expands and forms a negative pressure, drawing the arc ions generated by the moving arc contact from the airflow hole into the airflow space of the pressure cylinder to rapidly reduce the arc temperature and prevent the arc generated during closing from burning out the components. During opening, the moving contact rod, driven by the drive mechanism, moves the pressure cylinder, moving contact, and moving arc contact closer to the first opening. During the opening motion, the airflow space formed by the pressure cylinder, moving contact, and moving contact rod is compressed, generating high-pressure SF6 gas. The high-pressure gas in the pressure cylinder is exhausted through the airflow hole of the moving contact to deionize the ions generated during the breaking process, thereby extinguishing the arc. By setting an airflow hole in the moving contact, the side of the automatic contact with the airflow hole near the moving support is inclined and extends towards the side of the moving contact away from the moving support. In this way, during the opening process, the high-pressure gas in the airflow space formed by the air cylinder, the moving contact and the moving contact rod can be smoothly blown towards the arc, improving the ability to interrupt small DC currents. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a DC high-speed switch according to an embodiment of the present invention;

[0025] Figure 2 for Figure 1 A cross-sectional view of the arc-extinguishing chamber of a DC high-speed switch shown;

[0026] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle;

[0027] Figure 4 for Figure 2 A magnified view of a portion of point B in the middle;

[0028] Figure 5 for Figure 2 A cross-sectional view of the moving contact assembly of a DC high-speed switch shown.

[0029] Figure 6 for Figure 2 The diagram shows the structure of the moving contact of a DC high-speed switch.

[0030] Figure 7 for Figure 6 The diagram shows a cross-sectional view of the moving contact assembly of a DC high-speed switch.

[0031] Reference numerals: 10. Arc-extinguishing chamber; 11. Sleeve; 111. Receiving cavity; 12. Moving contact assembly; 121. Moving support; 1211. Guide groove; 1212. Guide ring; 1213. First elastic ring; 1214. Sealing groove; 122. Compressed cylinder; 123. Moving contact; 1231. Airflow hole; 124. Moving arc contact; 125. Moving contact rod; 126. Airflow space; 127. Nozzle; 1271. First nozzle Section; 1272, Second nozzle section; 1273, Third nozzle section; 1274, Fourth nozzle section; 13, Stationary contact assembly; 131, Stationary support; 1311, First step; 1312, Second step; 132, Stationary arc contact; 133, Stationary contact; 1331, Stationary contact body; 1332, Perforation; 134, Shielding cover; 1341, Mounting groove; 135, Elastic element; 20, Drive mechanism; 30, Insulating support. Detailed Implementation

[0032] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0033] Please see Figure 2 , Figure 3 and Figure 7An arc-extinguishing chamber 10 according to an embodiment of the present invention includes a sleeve 11 and a moving contact assembly 12. The sleeve 11 has a receiving cavity 111 and a first opening, the first opening communicating with the receiving cavity 111. The moving contact assembly 12 includes a moving support 121, a pressure cylinder 122, a moving contact 123, a moving arc contact 124, and a moving contact rod 125 for connection with a drive mechanism 20. The moving support 121 is inserted into the receiving cavity 111 and connected to the end of the sleeve 11 with the first opening. The moving support 121 has an inner hole that extends axially along the moving support 121, and the moving contact rod 125 is movably inserted into the inner hole. The moving arc contact 124 is mounted on the end of the moving contact rod 125 away from the drive mechanism 20 and is coaxially arranged with the moving contact rod 125. The moving contact 123 is sleeved on the moving arc contact 124 and connected to the moving contact rod 125. A pressure cylinder 122 is sleeved on the moving contact 123 and the moving support 121. The pressure cylinder 122 is fixedly connected to the moving contact 123 and slidably connected to the moving support 121. The pressure cylinder 122, the moving contact 123, and the moving contact rod 125 form an airflow space 126. The moving contact 123 is provided with an airflow hole 1231 communicating with the airflow space 126. The airflow hole 1231 extends at an angle from the side of the moving contact 123 near the moving support 121 towards the side of the moving contact 123 away from the moving support 121.

[0034] In the aforementioned arc-extinguishing chamber, during closing, the moving contact rod 125, under the action of the drive mechanism 20, drives the air cylinder 122, moving contact 123, and moving arc contact 124 to move away from the first opening. During the closing movement, the moving arc contact 124 generates an electric arc. Simultaneously, the airflow space 126 formed by the air cylinder 122, moving contact 123, and moving contact rod 125 expands and forms a negative pressure, drawing the arc ions generated by the moving arc contact 124 from the airflow hole 1231 into the airflow space 126 of the air cylinder 122 to rapidly reduce the arc temperature and prevent the arc generated during closing from burning out the components. During opening, the moving contact rod 125, under the action of the drive mechanism 20, drives the air cylinder 122, moving contact 123, and moving arc contact 124 to move closer to the first opening. During the opening process, the airflow space 126 formed by the air cylinder 122, moving contact 123, and moving contact rod 125 is compressed, generating high-pressure SF6 gas. The high-pressure gas in the air cylinder 122 is exhausted through the airflow hole 1231 of the moving contact 123 to deionize the ions generated during the breaking process, thereby extinguishing the arc. By providing the airflow hole 1231 in the moving contact 123, the airflow hole 1231 automatically extends from the side of the moving contact 123 near the moving support 121 towards the side of the moving contact 123 away from the moving support 121. In this way, during the opening process, the high-pressure gas in the airflow space 126 formed by the air cylinder 122, moving contact 123, and moving contact rod 125 can be smoothly blown towards the arc through the airflow hole 1231, which is beneficial to improving the ability to break small DC currents.

[0035] In one embodiment, see Figure 7 The angle between the axis of the airflow hole 1231 and the axis of the moving contact 123 is θ, where 25°≤θ≤45°. Thus, during the opening process, the high-pressure gas in the airflow space 126 formed by the air cylinder 122, the moving contact 123, and the moving contact rod 125 can be smoothly blown towards the arc through the airflow hole 1231, which helps improve the ability to interrupt small DC currents.

[0036] Optionally, θ can be 25°, 30°, or 45°. Specifically, in this embodiment, the angle between the axis of the airflow hole 1231 and the axis of the moving contact 123 is 30°. During the opening process, the high-pressure gas in the airflow space 126 formed by the air cylinder 122, the moving contact 123, and the moving contact rod 125 can be smoothly blown towards the arc through the airflow hole 1231, which is beneficial to improving the ability to interrupt small DC currents.

[0037] In one embodiment, see Figure 6 The airflow orifice 1231 is an oblong orifice that extends circumferentially along the moving contact 123. This increases the airflow through the airflow orifice 1231, so that during the opening process, more high-pressure gas in the airflow space 126 is blown toward the arc, improving the ability to interrupt small DC currents.

[0038] Optionally, see Figure 6 Two airflow holes 1231 are provided, both of which are oblong orifices. The two airflow holes 1231 are spaced apart circumferentially along the moving contact 123 and are symmetrically arranged about the central axis of the moving contact 123. The circumferential spacing H between the two airflow holes 1231 is 25mm, and the median diameter of the oblong orifice is... The diameter is 128mm, and the radius of the semicircular arc at both ends of the waist-shaped hole is 11mm.

[0039] In one embodiment, see Figure 2 and Figure 3 The moving contact assembly 12 also includes a nozzle 127. The nozzle 127 is connected to the moving contact 123 on the side away from the moving support 121, and an airflow hole 1231 is located within the nozzle 127. The end of the moving arc contact 124 away from the moving contact rod 125 is inserted into the nozzle 127. Furthermore, the nozzle 127 and the moving contact 123 are sealed together. Optionally, a sealant is provided between the nozzle 127 and the moving contact 123 to seal them. This prevents high-pressure gas from leaking out between the moving contact 123 and the nozzle 127, allowing all the high-pressure gas to flow out through the nozzle 127, which is beneficial for better arc extinguishing.

[0040] Further, see Figure 2 and Figure 5The nozzle 127 includes a first nozzle section 1271, a second nozzle section 1272, a third nozzle section 1273, and a fourth nozzle section 1274 connected in sequence. The first nozzle section 1271 has an automatic contact 123 extending away from the moving contact 123 along the axial direction of the moving arc contact 124. The second nozzle section 1272 is inclined from the side of the first nozzle section 1271 away from the moving contact 123 towards the axial direction closer to the moving arc contact 124. The third nozzle section 1273 extends from the side of the second nozzle section 1272 away from the first nozzle section 1271 along the axial direction of the moving arc contact 124. The fourth nozzle section 1274 is inclined from the side of the third nozzle section 1273 away from the second nozzle section 1272 towards the axial direction away from the moving arc contact 124. The end of the moving arc contact 124 away from the moving contact rod 125 is inserted into the first nozzle section 1271, and an airflow channel communicating with the airflow hole 1231 is formed between the moving arc contact 124 and the first nozzle section 1271 at an interval. Since the first nozzle section 1271 extends axially along the moving arc contact 124, this avoids installation interference between the nozzle 127 and other components. Since the second nozzle section 1272 is inclined axially from the side of the first nozzle section 1271 away from the moving contact 123 towards the moving arc contact 124, the second nozzle section 1272 can guide high-pressure gas to blow towards the third nozzle section 1273 so that the high-pressure gas extinguishes the arc. Since the fourth nozzle section 1274 is inclined axially away from the third nozzle section 1273 away from the second nozzle section 1272, that is, the diameter of the fourth nozzle section 1274 gradually increases from the third nozzle section 1273 away from the third nozzle section 1273, the high-pressure gas flow rate is controlled, and the interruption performance of the arc-extinguishing chamber 10 is guaranteed.

[0041] Furthermore, the diameter of the third nozzle section 1273 is 30mm to 40mm, and the angle between the fourth nozzle section 1274 and the axis of the moving arc contact 124 is 5° to 10°. In this way, without affecting the gas flow, the gas blowing is made stronger and the arcing time is shorter, achieving the optimal configuration of high-pressure gas pressure and gas blowing volume of nozzle 127 when the initial DC current is small.

[0042] Optionally, the diameter of the third nozzle section 1273 is 38 mm, and the angle between the fourth nozzle section 1274 and the axis of the moving arc contact 124 is 7.5°.

[0043] In one embodiment, see Figure 2 and Figure 3The outer circumferential surface of the movable support 121 is provided with a guide groove 1211, and the movable contact assembly 12 also includes a guide ring 1212, which is disposed within the guide groove 1211. The pressure cylinder 122 is guided and engaged with the movable support 121 through the guide ring 1212. In this way, the guide ring 1212 can constrain the axial movement of the pressure cylinder 122 along the movable support 121, making the movement of the pressure cylinder 122 directional and improving the stability of the movement of the pressure cylinder 122.

[0044] Further, see Figure 3 The moving contact assembly 12 also includes a first elastic ring 1213, which is disposed within the guide groove 1211, and a guide ring 1212 is disposed outside the first elastic ring 1213. In this way, the first elastic ring 1213 has a certain elasticity, which ensures that the guide ring 1212 has a guiding function while preventing the cylinder 122 from jamming during operation.

[0045] In one embodiment, see Figure 3 The outer circumferential surface of the movable support 121 is also provided with a sealing groove 1214. The movable contact assembly 12 also includes a sealing ring, which is disposed in the sealing groove 1214. The pressure cylinder 122 is sealed to the movable support 121 through the sealing ring. In this way, the pressure cylinder 122 is sealed to the movable support 121 through the sealing ring, which can improve the sealing performance of the pressure cylinder 122 and prevent high-pressure gas from escaping from the position between the pressure cylinder 122 and the movable support 121, so as to obtain higher pressure gas, which is beneficial to quickly extinguish the arc.

[0046] Optionally, the sealing ring is coated with grease. This reduces the friction between the sealing ring and the air cylinder 122, allowing the air cylinder 122 to move smoothly.

[0047] In one embodiment, see Figure 2The sleeve 11 has a second opening, which is opposite to the first opening. The arc-extinguishing chamber 10 also includes a stationary contact assembly 13, which includes a stationary support 131, a stationary arc contact 132, and a stationary contact 133. The stationary support 131 is inserted into the receiving cavity 111 and connected to the end of the sleeve 11 with the second opening. The stationary arc contact 132 and the stationary contact 133 are both installed on the side of the stationary support 131 facing the moving contact assembly 12. The stationary arc contact 132 and the moving arc contact 124 are coaxially arranged, and the stationary contact 133 surrounds the stationary arc contact 132. When closing the circuit, the moving contact rod 125, under the action of the drive mechanism 20, drives the air cylinder 122, the moving contact 123, and the moving arc contact 124 to move towards the stationary contact assembly 13. During the closing movement, the moving arc contact 124 and the stationary arc contact 132 generate an electric arc. At the same time, the airflow space 126 formed by the air cylinder 122, the moving contact 123, and the moving contact rod 125 expands and forms a negative pressure, which draws the arc ions generated by the moving arc contact 124 and the stationary arc contact 132 into the air cylinder 122 through the airflow hole 1231, rapidly reducing the arc temperature and preventing the arc generated during closing from burning out the components. During the opening process, the moving contact rod 125, under the action of the drive mechanism 20, drives the air cylinder 122, the moving contact 123, and the moving arc contact 124 to move away from the stationary contact assembly 13. During the opening process, the airflow space 126 formed by the air cylinder 122, the moving contact 123, and the moving contact rod 125 is compressed, generating highly compressed SF6 gas. The air cylinder 122 continues to move, and when the stationary arc contact 132 separates from the nozzle 127, the high-pressure gas in the airflow space 126 is exhausted through the airflow hole 1231 and the nozzle 127 to deionize the ions generated during the breaking process, thereby extinguishing the arc.

[0048] Further, see Figure 2 and Figure 4 The stationary contact 133 includes a second elastic ring and multiple stationary contact bodies 1331, which are arranged circumferentially along the stationary support 131. Each stationary contact body 1331 has a through hole 1332 at one end near the stationary support 131. The second elastic ring passes through the through hole 1332 of each stationary contact body 1331, and the multiple stationary contact bodies 1331 are secured to the outer circumferential surface of the stationary support 131 facing the moving contact assembly 12 by the second elastic ring. Optionally, the second elastic ring is an elastic steel wire ring. Thus, using the second elastic ring to connect the multiple stationary contact bodies 1331 together in series prevents the stationary contact bodies 1331 from scattering due to improper force applied by the operator during installation, thereby improving production efficiency. Furthermore, the second elastic ring also provides contact force between the multiple stationary contact bodies 1331 and the stationary support 131.

[0049] In one embodiment, see Figure 2 and Figure 4The stationary contact assembly 13 also includes a shield 134, which is coaxially arranged with and connected to the stationary support 131. The shield 134 covers the stationary contact 133. This prevents tip discharge from occurring on the stationary contact 133.

[0050] Further, see Figure 2 and Figure 4 The stationary contact assembly 13 also includes an elastic element 135, which is disposed between the stationary contact 133 and the shielding cover 134. Multiple elastic elements 135 are provided, with each elastic element 135 corresponding to a different stationary contact body 1331. One end of the elastic element 135 abuts against the outer peripheral surface of the stationary contact body 1331, and the other end abuts against the inner peripheral surface of the shielding cover 134. This arrangement allows the elastic element 135 to provide clamping force, pressing the stationary contact body 1331 against the outer peripheral surface of the stationary support 131 facing the moving contact assembly 12. Furthermore, this ensures a uniform distribution of the stationary contact bodies 1331, preventing uneven distribution from causing them to squeeze against each other, which could lead to offsetting clamping force and reduced flow capacity, thus improving product reliability.

[0051] Optionally, the elastic element 135 is a leaf spring. The outer peripheral surface of the stationary contact body 1331 is provided with a first groove, and the inner peripheral surface of the shield 134 is provided with a corresponding second groove. One end of the leaf spring is inserted into the first groove, and the other end is inserted into the second groove.

[0052] Further, see Figure 4 The stationary support 131 has a first step 1311 and a second step 1312 on its outer peripheral surface facing the moving contact assembly 12. The first step 1311 is closer to the outer peripheral surface of the stationary support 131 than the second step 1312. One end of the shield 134 is mounted on the first step 1311, and the end of the shield 134 away from the stationary support 131 has a mounting groove 1341. One end of the stationary contact 133 is mounted on the second step 1312, and the other end is inserted into the mounting groove 1341. Thus, one end of the shield 134 and one end of the stationary contact 133 are respectively mounted on the first step 1311 and the second step 1312, forming a gap between the stationary contact 133 and the shield 134 for mounting the elastic member 135. One end of the shield 134 is installed on the second step portion 1312, and the other end is inserted into the mounting groove 1341 of the shield 134. In this way, the stationary contact 133 abuts against the second step portion 1312 and the groove wall of the mounting groove 1341 under the action of the elastic member 135, so as to achieve reliable installation of the stationary contact 133.

[0053] See Figure 1An embodiment of the present invention provides a DC high-speed switch, comprising an insulating support 30, a drive mechanism 20, and an arc-extinguishing chamber 10 as described in any of the above embodiments. The drive mechanism 20 is mounted on the insulating support 30 and is connected to the moving contact rod 125. The beneficial effects of the DC high-speed switch can be referred to the beneficial effects of the arc-extinguishing chamber 10, and will not be repeated here.

[0054] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not 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, they should not be construed as limitations on this invention.

[0055] Furthermore, the terms "first" and "second" 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 at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0056] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0057] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0058] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0059] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0060] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. An arc-extinguishing chamber, characterized in that, include: A sleeve, the sleeve having a receiving cavity and a first opening communicating with the receiving cavity; and A moving contact assembly includes a moving support, a pressure cylinder, a moving contact, a moving arc contact, and a moving contact rod for connection with a drive mechanism. The moving support is inserted into the receiving cavity and connected to the end of the sleeve with the first opening. The moving support has an inner hole extending axially along the moving support, and the moving contact rod is movably inserted into the inner hole. The moving arc contact is mounted on the end of the moving contact rod away from the drive mechanism and is coaxially arranged with the moving contact rod. A contact is sleeved on the moving arc contact and connected to the moving contact rod; a pressure cylinder is sleeved on the moving contact and the moving support, the pressure cylinder is fixedly connected to the moving contact and slidably connected to the moving support, the pressure cylinder, the moving contact, and the moving contact rod enclose an airflow space, the moving contact is provided with an airflow hole communicating with the airflow space, the airflow hole extends obliquely from the side of the moving contact near the moving support towards the moving arc contact and away from the moving contact rod. The moving contact assembly further includes a nozzle, which is installed on the side of the moving contact away from the moving support. The nozzle and the moving contact are sealed together. One end of the moving arc contact away from the moving contact rod is inserted into the nozzle. The nozzle includes a first nozzle segment, a second nozzle segment, a third nozzle segment, and a fourth nozzle segment connected in sequence. The first nozzle segment extends from the moving contact along the axial direction of the moving arc contact away from the moving contact. The second nozzle segment is inclined from the side of the first nozzle segment away from the moving contact towards the axial direction close to the moving arc contact. The third nozzle segment extends from the side of the second nozzle segment away from the first nozzle segment along the axial direction of the moving arc contact. The fourth nozzle segment is inclined from the side of the third nozzle segment away from the second nozzle segment towards the axial direction away from the moving arc contact. One end of the moving arc contact away from the moving contact rod is inserted into the first nozzle segment, and an airflow channel communicating with the airflow hole is formed between the moving arc contact and the first nozzle segment at an interval.

2. The arc-extinguishing chamber according to claim 1, characterized in that, The angle between the axis of the airflow hole and the axis of the moving contact is 25° to 45°.

3. The arc-extinguishing chamber according to claim 1, characterized in that, The airflow hole is an oblong hole that extends circumferentially along the moving contact. The airflow holes are provided in two shapes, both of which are waist-shaped holes. The two airflow holes are spaced apart along the circumference of the moving contact and are symmetrically arranged about a plane passing through the central axis of the moving contact.

4. The arc-extinguishing chamber according to claim 1, characterized in that, The diameter of the third nozzle section is 30mm to 40mm, and the included angle between the fourth nozzle section and the axis of the moving arc contact is 5° to 10°.

5. The arc-extinguishing chamber according to claim 1, characterized in that, The outer circumferential surface of the movable support is provided with a guide groove, and the movable contact assembly further includes a guide ring, which is disposed in the guide groove. The air cylinder is guided and engaged with the movable support through the guide ring. The moving contact assembly further includes a first elastic ring, which is disposed within the guide groove, and the guide ring is disposed outside the first elastic ring.

6. The arc-extinguishing chamber according to claim 1, characterized in that, The outer circumferential surface of the movable support is provided with a sealing groove, and the movable contact assembly also includes a sealing ring. The sealing ring is disposed in the sealing groove, and the air cylinder is sealed and fitted with the movable support through the sealing ring.

7. The arc-extinguishing chamber according to any one of claims 1 to 6, characterized in that, The sleeve is provided with a second opening opposite to the first opening; The arc-extinguishing chamber also includes a stationary contact assembly, which includes a stationary support, a stationary arc contact, and a stationary contact. The stationary support is inserted into the receiving cavity and connected to the end of the sleeve with the second opening. The stationary arc contact and the stationary contact are both installed on the side of the stationary support facing the moving contact assembly. The stationary arc contact and the moving arc contact are coaxially arranged, and the stationary contact surrounds the stationary arc contact.

8. The arc-extinguishing chamber according to claim 7, characterized in that, The stationary contact includes a second elastic ring and a plurality of stationary contact bodies. The plurality of stationary contact bodies are arranged circumferentially along the stationary support. Each of the plurality of stationary contact bodies has a through hole at one end near the stationary support. The second elastic ring passes through the through hole of each of the stationary contact bodies. The plurality of stationary contact bodies are clamped to the outer peripheral surface of the stationary support facing the moving contact assembly by the second elastic ring.

9. The arc-extinguishing chamber according to claim 8, characterized in that, The stationary contact assembly also includes a shield, which is coaxially arranged with and connected to the stationary support, and the shield covers the stationary contact.

10. The arc-extinguishing chamber according to claim 9, characterized in that, The stationary contact assembly further includes an elastic element, which is disposed between the stationary contact and the shield. Multiple elastic elements are provided, and each elastic element corresponds to a stationary contact body. One end of the elastic element abuts against the outer peripheral surface of the stationary contact body, and the other end abuts against the inner peripheral surface of the shield.

11. The arc-extinguishing chamber according to claim 10, characterized in that, The outer peripheral surface of the stationary support facing the moving contact assembly is provided with a first step and a second step. The first step is closer to the outer peripheral surface of the stationary support than the second step. One end of the shield is installed on the first step, and the end of the shield away from the stationary support is provided with a mounting groove. One end of the stationary contact is installed on the second step, and the other end is inserted into the mounting groove.

12. A DC high-speed switch, characterized in that, It includes an insulating support, a drive mechanism, and an arc-extinguishing chamber as described in any one of claims 1 to 11, wherein the drive mechanism is mounted on the insulating support and is connected to the moving contact rod.

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