Circuit on-off device and gas density relay

Abstract

According to the circuit on-off device and the gas density relay provided by the invention, mercury is adopted as a conductor in the circuit on-off device, the on-off of a circuit is realized through mechanical dynamic sealing, the on-off switching difference is extremely small, and the sensitivity and the precision are both at a relatively high level; by adjusting the force of the reset spring, the anti-seismic performance of the circuit on-off device can be remarkably improved, and the overall stability is good; the current resistance capability is flexibly controlled by adjusting the contact area of the conducting electrode and the liquid conducting medium, and the stronger current resistance capability can be obtained; the circuit on-off device can also be made into an ultrathin appearance, the thickness of the gas density relay is effectively reduced, and the production cost is further remarkably reduced.

Description

Technical Field

[0001] The present application relates to the technical field of relays, and in particular to circuit switching devices and gas density relays. Background Art

[0002] In current power systems, gas density relays are critical protection and control components for ensuring safe equipment operation. A circuit breaker failure not only disrupts power grid operations but can also trigger a series of chain reactions, resulting in significant economic losses. Therefore, ensuring reliable circuit breaker operation is crucial. To achieve this, it's crucial to continuously and accurately monitor key circuit breaker indicators to ensure they consistently comply with relevant standards, thereby maintaining optimal long-term operating conditions.

[0003] The microswitch in the gas density relay plays a crucial role in this process, serving as the core component for providing monitoring alarm signals. However, due to its reed-operated principle, traditional microswitches have some unavoidable limitations. First, their relatively large switching error means they are less sensitive to changes in the circuit breaker's status during monitoring, delaying the issuance of alarm signals and preventing timely detection and resolution of faults. Second, due to their structural characteristics, traditional microswitches have limited seismic resistance and are prone to false alarms when exposed to high-intensity shocks. These false alarms not only disrupt normal operations and maintenance but can also trigger unnecessary emergency measures, wasting manpower and resources, and even potentially causing further damage to equipment due to misjudgment. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the prior art, the present invention provides a circuit switching device and a gas density relay, which are used to solve the problems of large switching difference, poor impact resistance and pressure resistance of traditional micro switches.

[0005] To achieve the above-mentioned objectives and other related objectives, the first aspect of the present application provides a circuit-breaking device, comprising: a circuit-breaking device body, wherein a cavity is provided inside the circuit-breaking device body; the cavity is filled with a liquid conductive medium; a movable component, wherein the movable component slides vertically and penetrates the circuit-breaking device body; the bottom of the movable component is located in the cavity; a conducting electrode is further provided at the bottom of the movable component; the movable component is slid up and down in the vertical direction to make the conducting electrode contact or not contact with the liquid conductive medium, and the circuit-breaking device is in a conducting or disconnecting state.

[0006] In some embodiments of the first aspect of the present application, the circuit-breaking device further includes an elastic member; the elastic member is disposed in the cavity, one end of the elastic member is connected to the bottom of the moving part, and the other end of the elastic member is connected to the bottom of the cavity.

[0007] In some embodiments of the first aspect of the present application, the circuit-breaking device further includes an elastic member; the elastic member is sleeved on the moving component.

[0008] In some embodiments of the first aspect of the present application, the circuit-breaking device further includes a welding component; the welding component includes a first welding foot and a second welding foot; the first welding foot and the second welding foot are respectively arranged on both sides of the circuit-breaking device body, and penetrate the wall of the circuit-breaking device body to contact the liquid conductive medium.

[0009] In some embodiments of the first aspect of the present application, the circuit-breaking device further includes a welding component; the welding component includes a first welding foot and a second welding foot; the first welding foot and the second welding foot pass through the movable component and are connected to the conductive electrode.

[0010] In some embodiments of the first aspect of the present application, a first sealing ring and a second sealing ring are respectively provided at both ends of the conducting electrode; the first sealing ring and the second sealing ring are used to prevent leakage of the liquid conductive medium.

[0011] In some embodiments of the first aspect of the present application, the liquid conductive medium is mercury.

[0012] In some embodiments of the first aspect of the present application, the elastic member is a spring.

[0013] To achieve the above-mentioned purpose and other related purposes, a second aspect of the present application provides a gas density relay, comprising: the circuit switching device as described above.

[0014] In some embodiments of the second aspect of the present application, the circuit breaker is mounted on the gas density relay by the welding component.

[0015] As described above, the circuit breaker and gas density relay provided by this application have the following beneficial effects:

[0016] The circuit-breaking device of the present application uses mercury as a conductor inside, and realizes the conduction and disconnection of the circuit through mechanical dynamic sealing. The on-off switching difference is extremely small, and the sensitivity and accuracy are at a high level; by adjusting the reset spring force, the seismic performance of the circuit-breaking device can be significantly improved and the overall stability is good; by adjusting the contact area between the conducting electrode and the liquid conductive medium, the current resistance can be flexibly controlled, and a stronger current resistance can be obtained; the circuit-breaking device can also be made into an ultra-thin appearance, effectively reducing the thickness of the gas density relay, thereby significantly reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It shows a schematic structural diagram of a circuit switching device in a normally closed mode in the on state in one embodiment of the present application.

[0018] Figure 2 It shows a schematic structural diagram of a circuit switching device in an embodiment of the present application in a normally closed mode in an off-circuit state.

[0019] Figure 3 Shown is a three-dimensional structural schematic diagram of a circuit switching device in one embodiment of the present application.

[0020] Figure 4 It shows a schematic structural diagram of a circuit switching device in an embodiment of the present application in a normally open mode in an off-circuit state.

[0021] Figure 5 It shows a schematic structural diagram of a circuit switching device in a normally open mode in the on state in one embodiment of the present application.

[0022] Figure 6 It shows a structural diagram of another circuit switching device in an embodiment of the present application in a special-shaped normally closed mode in the on state.

[0023] Figure 7 It shows a schematic structural diagram of another circuit-breaking device in an embodiment of the present application in an anomalous normally closed mode in an off-circuit state.

[0024] Component number description

[0025] 1 Switch device body

[0026] 2 Moving parts

[0027] 3 Liquid conductive medium

[0028] 4 Conductive electrodes

[0029] 5 elastic parts

[0030] 6 First welding leg

[0031] 7 Second solder leg

[0032] 8 First sealing ring

[0033] 9 Second sealing ring DETAILED DESCRIPTION

[0034] The following describes the embodiments of the present application through specific examples. Those skilled in the art can easily understand the other advantages and effects of the present application from the content disclosed in this specification. The present application can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other unless they conflict.

[0035] The following describes the implementation of the present invention through specific embodiments. People skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0036] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they have no technical substantive significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention. The following detailed description should not be considered restrictive, and the scope of the embodiments of this application is only limited by the claims of the published patents. The terms used here are only for describing specific embodiments and are not intended to limit this application. Spatial-related terms, such as "upper", "lower", "left", "right", "below", "below", "lower", "above", "upper", etc., may be used in the text to facilitate the description of the relationship between an element or feature shown in the figure and another element or feature.

[0037] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," "fixed," and "holding" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0038] Furthermore, as used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It should be further understood that the terms "comprise", "include" indicate the presence of the described features, operations, elements, components, items, kinds, and / or groups, but do not exclude the presence, occurrence, or addition of one or more other features, operations, elements, components, items, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Thus, "A, B, or C" or "A, B, and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B, and C". Exceptions to this definition occur only when the combination of elements, functions, or operations is inherently mutually exclusive in some way.

[0039] The circuit-breaking device and gas density relay provided in this application are widely used in industries including but not limited to electric power, metallurgy, petrochemicals, coal mining, electrified railways, public utilities, and the like. In the power industry, these devices are used to monitor the SF6 gas density of transformers, circuit breakers, and other equipment in substations, power plants, and UHV transmission projects, effectively ensuring the stable operation of the power grid. In the metallurgical industry, these devices are used in high-voltage distribution rooms and large motors in steel mills to promptly detect abnormal drops in SF6 gas density in high-voltage circuit breakers, ensuring safe equipment operation and ensuring production continuity. In the petrochemical industry, these devices are used to monitor SF6 gas density in substations and gas compressors in petroleum and chemical companies to prevent equipment failure. In the coal mining industry, these devices are used in underground power supply systems and ventilation equipment to promptly and accurately monitor gas density changes, effectively reducing the risk of electrical equipment failure, improving the overall safety level of mines, and providing a strong guarantee for safe production in coal mines. In the electrified railway industry, these devices are used in equipment such as railway traction substations to accurately monitor gas density and provide timely alarms, ensuring the normal operation of traction substations and providing a solid guarantee for the safe and punctual operation of high-speed trains. In the public utility industry, these devices are used in urban substations and gas pressure regulating stations to ensure the reliable operation of alarm systems, safeguard the safety and stability of urban infrastructure, and provide reliable protection for residents' daily lives. The application of the circuit-breaking device of the present application in the gas density relay has important practical significance and broad market prospects. The circuit-breaking device not only improves the safety and reliability of the equipment, but also provides technical support for the development of related industries.

[0040] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the following embodiments and the accompanying drawings are used to further describe the technical solutions in the embodiments of the present invention. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0041] To facilitate understanding of the embodiments of this application, first Figures 1 to 7 Detailed description. Figures 1 to 7 The following is a schematic diagram showing the structure of a circuit breaker device according to an embodiment of the present invention. The circuit breaker device includes:

[0042] A switch device body 1, wherein a cavity is provided inside the switch device body 1; the cavity is filled with a liquid conductive medium 3;

[0043] A moving part 2, the moving part 2 being slidably disposed on the switching device body 1 in a vertical direction; the bottom of the moving part 2 being located in the cavity and in contact with the liquid conductive medium 3;

[0044] The bottom of the movable part 2 is also provided with a conducting electrode 4; the movable part 2 slides up and down in the vertical direction to make the conducting electrode 4 contact or not contact the liquid conductive medium 3, and the circuit-breaking device is in a conducting or disconnecting state.

[0045] It should be noted that the switch body 1 is the main framework of the circuit breaker, and its shape design offers a high degree of flexibility and adaptability. The shape of the switch body 1 can be regular, bilaterally symmetrical, or irregular, asymmetrical. Choosing the shape of the switch body 1 based on different design requirements can improve its applicability in different application scenarios.

[0046] like Figures 1 to 5 As shown, the circuit-breaking device body 1 adopts a regular shape that is bilaterally symmetrical, such as a cylinder, a T-shaped cylinder, a rectangular parallelepiped, etc. The regular shape design can ensure the consistency and accuracy of the circuit-breaking device during the manufacturing process, and help to simplify the manufacturing process, reduce production costs, and at the same time ensure the performance stability of the circuit-breaking device.

[0047] In some examples, such as Figure 1 and Figure 2 As shown, the switch device body 1 is composed of a rectangular parallelepiped and a cylinder. The rectangular parallelepiped and the cylinder are an integrated structure. The cylinder is embedded in the axial center of the rectangular parallelepiped and passes through the rectangular parallelepiped. The switch device body 1 is a regular shape with bilateral symmetry.

[0048] In some examples, such as Figure 4 and Figure 5 As shown, the switch device body 1 is composed of a rectangular parallelepiped and a T-shaped column. The rectangular parallelepiped and the T-shaped column are an integrated structure. The T-shaped column is embedded in the axial center of the rectangular parallelepiped and passes through the rectangular parallelepiped. The switch device body 1 is a regular shape with bilateral symmetry.

[0049] like Figure 6 and 7As shown, in some special application scenarios, the switch device body 1 may need to have a specific irregular shape to accommodate a specific installation space or meet specific functional requirements. The irregular shape of the switch device body 1 can be any asymmetric shape, and the irregular shape design can provide greater design freedom.

[0050] Furthermore, regardless of whether the shape of the switch device body 1 is regular or irregular, a cavity is provided therein to accommodate the liquid conductive medium 3. The liquid conductive medium 3 can be filled in the cavities on both sides of the switch device body 1 or in the cavity at the bottom of the switch device body 1. The liquid conductive medium 3 can be filled in other suitable locations in the switch device body 1 according to actual circumstances, and this is not limited in this embodiment.

[0051] The cavity of the switch device body 1 is filled with a liquid conductive medium 3. This liquid conductive medium 3 has excellent electrical conductivity and is typically an electrolyte solution, such as an aqueous sodium chloride solution. This medium contains a large number of freely mobile ions that can move in a directed manner under the action of an electric field to form an electric current. Furthermore, the liquid conductive medium 3 should be chemically stable, non-volatile, and unlikely to chemically react with the switch device body 1 and other components within it, to ensure the device's reliability during long-term use.

[0052] A movable member 2 is provided on the switch device body 1. The movable member 2 is arranged to slide vertically through the switch device body 1. The outer wall of the movable member 2 slides in a tight, fitted relationship with the inner wall of the switch device body 1. This not only ensures smooth vertical sliding of the movable member 2 on the switch device body 1, but also provides a certain sealing effect, preventing the liquid conductive medium 3 in the cavity from overflowing from the through-hole.

[0053] Specifically, the top of the movable member 2 is located outside the switch body 1, facilitating operation using an external mechanism to apply external force. The movable member 2 is constructed from a metal or polymer material with excellent mechanical strength and wear resistance to ensure it resists wear during frequent sliding. The movable member 2 can be constructed in the form of a convex-shaped column, a T-shaped column, a cylinder, a cylindrical tube, a triangular prism, a hexagonal prism, or an octagonal prism, although this is not a limitation in this embodiment.

[0054] The bottom of the moving part 2 vertically penetrates the switching device body 1 and extends into the cavity of the switching device body 1. A conducting electrode 4 is provided at the bottom of the moving part 2. The conducting electrode 4 is made of a highly conductive metal material, such as copper or silver. By adjusting the preset size of the conducting electrode and changing the contact area between the conducting electrode and the liquid conductive medium 3, the current carrying capacity of the circuit-breaking device can be adjusted.

[0055] It should be explained that current withstand capability refers to the maximum current value that a circuit breaker can withstand during normal operation. This circuit breaker controls current withstand capability by adjusting the contact area between the conducting electrode and the liquid conductive medium. When the contact area between the conducting electrode and the liquid conductive medium is large, the resistance of the current passing through the mercury is relatively small, and the breaker can withstand a higher current. When the contact area between the conducting electrode and the liquid conductive medium is small, the resistance is relatively large, and the current withstand capability is correspondingly reduced. By changing the preset dimensions of the conducting electrode, adjusting the contact area between the conducting electrode and the liquid conductive medium, and precisely controlling the size of the contact area, circuit breaker devices with different current withstand capabilities can be designed according to actual application requirements. For example, in some high-current circuits, the contact area can be increased to improve the current withstand capability of the circuit breaker device and ensure its stable operation; while in some low-current circuits, the contact area can be reduced, thereby optimizing the device's structure and performance while ensuring the circuit breaker's on-off function.

[0056] Specifically, in some examples, combined with Figure 1 and Figure 2 The working principle of the circuit breaker in this embodiment is as follows:

[0057] When the moving part 2 slides downward in the vertical direction, the conductive electrode 4 and the liquid conductive medium 3 are gradually separated until they are completely out of contact. The conductive path between the two is cut off, the current cannot form a complete circuit, the circuit switching device is in an open circuit state, the current in the circuit is blocked, and the electrical equipment stops working or issues an alarm signal.

[0058] As the moving part 2 slides upward in the vertical direction, the conductive electrode 4 at the bottom of the moving part 2 gradually regains contact with the liquid conductive medium 3 in the cavity. When the conductive electrode 4 is fully in contact with the liquid conductive medium 3, current can form a complete current loop through the conductive electrode 4, the liquid conductive medium 3, and the circuit portion connected to the liquid conductive medium 3. At this time, the circuit switching device is in the on state, the current in the circuit can flow normally, and various electrical devices operate normally.

[0059] In one embodiment, the circuit-breaking device further includes an elastic member 5 ; the elastic member 5 is disposed in the cavity, one end of the elastic member 5 is connected to the bottom of the moving component 2 , and the other end of the elastic member 5 is connected to the bottom of the cavity.

[0060] Specifically, combined Figure 1 、 Figure 2 、 Figure 6 and Figure 7It is explained that the movable part 2 adopts a convex cylindrical structure, and the convex cylinder includes a first cylinder and a second cylinder located on the top of the first cylinder, and the circumferential diameter of the first cylinder is larger than the circumferential diameter of the second cylinder. The movable part 2 is arranged on the switching device body 1, and the switching device body 1 adopts a cylindrical structure. Among them, the first cylinder of the convex cylinder of the movable part 2 is located in the cavity of the switching device body 1. One end of the second cylinder of the convex cylinder is located outside the switching device body 1, and the other end of the second cylinder is located in the cavity of the switching device body 1, which plays a limiting role. The elastic member 5 is arranged in the cavity of the switching device body 1, and one end of the elastic member 5 is connected to the bottom of the movable part 2, and the other end of the elastic member 5 is firmly connected to the bottom of the cavity, which plays a fixing role.

[0061] In one embodiment, the circuit-breaking device further includes an elastic member 5 ; the elastic member 5 is sleeved on the moving component 2 .

[0062] Combine Figure 4 and Figure 5 The movable member 2 is a T-shaped columnar structure, while the switch body 1 is composed of a rectangular parallelepiped and a T-shaped column. The T-end of the movable member 2's T-shaped column is positioned outside the T-end of the switch body 1. The elastic member 5 is sleeved onto the movable member 2, with one end of the elastic member 5 connected to the T-end of the movable member 2's T-shaped column and the other end of the elastic member 5 connected to the T-end of the switch body 1's T-shaped column.

[0063] In this embodiment, the elastic member 5 may also be provided at other suitable positions in the circuit-breaking device, which is not limited here.

[0064] It should be noted that the elastic member 5 is used to provide the necessary elastic force to ensure that the movable component 2 can move stably up and down within the cavity and, when necessary, to restore the movable component 2 connected to the elastic member 5 to its initial position. The elastic member 5 can be, but is not limited to, a spring. Preferably, the elastic member 5 is a spring. By adjusting the spring tension to adjust the spring force, better shock resistance is achieved and the stability of the circuit breaker device during long-term use is ensured.

[0065] Specifically, combined Figure 1 and Figure 2 It is explained that the working principle of the circuit breaker device equipped with the elastic member 5 in this embodiment is as follows:

[0066] When a system failure occurs, the moving part 2 will be subjected to a specific external pressure. At this time, the moving part 2 slides downward in the vertical direction. As the moving part 2 continues to move downward, the moving part 2 presses down the elastic part 5. When the displacement of the moving part 2 reaches a certain extent, the contact between the conductive electrode 4 and the liquid conductive medium 3 is cut off.

[0067] When the system fault is repaired, the external force acting on the moving part 2 disappears. At this point, the moving part 2 rebounds vertically upward due to the elastic force of the elastic member 5. As the moving part 2 moves upward, the conductive electrode 4 also moves upward, gradually coming into contact with the liquid conductive medium 3. When the moving part 2 returns to its initial position, the conductive electrode 4 and the liquid conductive medium 3 are in complete contact, and the circuit is reconnected.

[0068] It should be understood that the elastic member 5 provides the power source for resetting the movable member 2, ensuring that the circuit of the circuit breaker device can quickly resume normal operation. Furthermore, by adjusting the reset spring force of the elastic member, the circuit breaker device's shock resistance can be improved, ensuring good stability. This allows the circuit breaker device to operate stably in complex power system operating environments (e.g., harsh conditions such as high-intensity shocks), avoiding false alarms. Furthermore, the mechanical dynamic seal of the movable member 2 achieves circuit conduction and disconnection, with minimal switching difference, thus ensuring the circuit breaker device's high sensitivity and precision, enabling timely and accurate alarm signals.

[0069] In one embodiment, combining Figure 1 、 Figure 2 、 Figure 6 and Figure 7 It is noted that the circuit-breaking device further includes a welding component; the welding component includes a first welding foot 6 and a second welding foot 7; the first welding foot 6 and the second welding foot 7 are respectively arranged on both sides of the circuit-breaking device body 1, and penetrate the wall of the circuit-breaking device body 1 to contact the liquid conductive medium 3.

[0070] The welding component is used to connect the circuit-breaking device with other circuit elements. The first welding pin 6 and the second welding pin 7 are respectively arranged on both sides of the circuit-breaking device body 1. The first welding pin 6 and the second welding pin 7 both penetrate the wall of the circuit-breaking device body 1 and contact the liquid conductive medium 3, so as to realize the conduction of current. Specifically, the first welding pin 6 contacts the liquid conductive medium 3 in the cavity on one side of the circuit-breaking device body 1, and the second welding pin 7 contacts the liquid conductive medium 3 in the cavity on the other side of the circuit-breaking device body 1. When the conductive electrode 4 contacts the liquid conductive medium 3, the conductive electrode 4, the liquid conductive medium 3, the first welding pin 6, the second welding pin 7 and the other circuit elements connected to the welding component form a complete current loop, and the circuit of the circuit-breaking device is in a conductive state.

[0071] In one embodiment, combining Figure 4 and Figure 5 It is noted that the circuit-breaking device further includes a welding component; the welding component includes a first welding leg 6 and a second welding leg 7; the first welding leg 6 and the second welding leg 7 pass through the moving component and are connected to the conductive electrode 4.

[0072] The welding components are used to connect the circuit breaker device to other circuit components. In this embodiment, the first welding leg 6 and the second welding leg 7 pass through the movable component 2 and are respectively connected to the conductive electrode 4 at the bottom of the movable component 2. In this case, there are two conductive electrodes 4 at the bottom of the movable component 2, and the two conductive electrodes 4 are respectively arranged on both sides of the bottom of the movable component 2 that contacts the inner wall of the switch device body 1. Specifically, one end of the first welding leg 6 is outside the movable component 2, and the other end of the first welding leg 6 is connected to a conductive electrode 4 at the bottom of the movable component 2; one end of the second welding leg 7 is outside the movable component 2, and the other end of the second welding leg 7 is connected to another conductive electrode 4 at the bottom of the movable component 2. The first welding leg 6 and the second welding leg 7 are connected to other external circuit components.

[0073] When the moving part 2 moves downward in the vertical direction, the two conductive electrodes 4 located at the bottom of the moving part 2 move downward and contact the liquid conductive medium 3. The liquid conductive medium 3, the two conductive electrodes 4, the first welding pin 6 and the second welding pin 7 form a current loop. The first welding pin 6 and the second welding pin 7 conduct the current to other externally connected circuit elements, and the circuit of the circuit-breaking device is in a conducting state.

[0074] The first soldering foot 6 and the second soldering foot 7 in this embodiment may also be arranged at other appropriate positions in the circuit-breaking device, which is not limited here.

[0075] In one embodiment, a first sealing ring 8 and a second sealing ring 9 are respectively provided at both ends of the conducting electrode 4 ; the first sealing ring 8 and the second sealing ring 9 are used to prevent leakage of the liquid conductive medium 3 .

[0076] Combine Figure 1 、 Figure 2 、 Figure 6 and Figure 7 The conductive electrode 4 is mounted at the bottom of the movable component 2, with both ends of the conductive electrode 4 contacting the inner wall of the switching device body 1. A first sealing ring 8 and a second sealing ring 9 are located at the contact points between the conductive electrode 4 and the inner wall of the switching device body 1. The first and second sealing rings 8 and 9 prevent the liquid conductive medium 3 from leaking through the gap into the mounting area of the elastic member 5 or other locations. This sealing design improves the reliability and service life of the circuit-breaking device.

[0077] In some examples, combined Figure 4 and Figure 5 To illustrate, two conductive electrodes 4 are provided at the bottom of the moving part 2, one on each side of the bottom of the moving part 2 where it contacts the inner wall of the switching device body 1. Each conductive electrode 4 is provided with a corresponding first sealing ring 8 and second sealing ring 9 at the contact end with the inner wall of the switching device body 1. The first sealing ring 8 and second sealing ring 9 are used to prevent leakage of the liquid conductive medium 3.

[0078] In one embodiment, the liquid conductive medium 3 is mercury. Mercury has high conductivity and chemical stability. Using mercury as a conductive medium can significantly improve the conductivity of circuit-breaking devices and enhance circuit efficiency. Mercury's chemical stability makes it less susceptible to chemical reactions or deterioration during long-term use, thereby increasing the reliability and service life of circuit-breaking devices.

[0079] An embodiment of the present invention further provides a gas density relay, comprising the circuit switching device described above.

[0080] In one embodiment, the circuit breaker is mounted on the gas density relay by means of the welding component.

[0081] It should be explained that a gas density relay is a device used to monitor gas density, commonly used in high-voltage electrical equipment to ensure that the insulating gas (such as SF6 gas) inside the equipment remains within a safe density range. When the gas density changes, the gas density relay can send a signal to alert the operator to take action.

[0082] In a gas density relay, the circuit breaker device provided by the present invention acts as a switching device whose primary function is to control the on / off state of the circuit based on changes in gas density. When the gas density falls below or rises above a set value, the circuit breaker device triggers a corresponding signal, thereby enabling monitoring and control of gas density. The circuit breaker device provided by the present invention can comprehensively enhance the performance of gas density relays, providing more reliable assurance for the safe and stable operation of power systems.

[0083] Specifically, when the circuit on-off device is in the normally closed mode, such as Figure 1 and Figure 2 As shown, the working process of the gas density relay equipped with the circuit switching device provided by the present invention is as follows:

[0084] The circuit-breaking device is welded to the alarm circuit of the gas density relay through the first welding leg 6 and the second welding leg 7 of the welding component. When the system monitored by the gas density relay fails, the internal air pressure of the system changes. The increased air pressure compels the moving component 2 to move downward in the vertical direction. At this time, the conductive electrode 4 moves downward accordingly. When the displacement reaches a certain extent, the conductive electrode 4 and the mercury are separated, the entire circuit is disconnected, and the gas density relay sends an alarm signal.

[0085] When the system fault is repaired, the air pressure returns to normal and the moving part 2 is no longer pressed by external force. At this time, under the influence of the spring force, the moving part 2 rebounds upward, and the conductive electrode 4 moves upward in the vertical direction to reset. The conductive electrode 4 contacts the mercury and the circuit is turned on.

[0086] It should be noted that the circuit-breaking device provided by the present invention uses mercury as a conductor inside, and realizes the conduction and disconnection of the circuit through mechanical dynamic sealing. The on-off switching difference is extremely small, and the sensitivity and accuracy are at a high level; by adjusting the reset spring force, the seismic performance of the circuit-breaking device can be significantly improved and the overall stability is good; by adjusting the contact area between the conducting electrode and the liquid conductive medium, the current resistance can be flexibly controlled, and a stronger current resistance can be obtained; the circuit-breaking device can also be made into an ultra-thin appearance, effectively reducing the thickness of the gas density relay, thereby significantly reducing the production cost.

[0087] In the embodiments of the present application, words such as "first" and "second" are used to distinguish between identical or similar items with substantially the same functions and effects, and do not limit their order. Those skilled in the art will understand that words such as "first" and "second" do not limit the quantity or execution order, and words such as "first" and "second" do not necessarily mean different.

[0088] It should be noted that in the embodiments of this application, words such as "exemplary" or "for example" represent examples, illustrations, or descriptions. Any embodiment or design described in this application as "exemplary" or "for example" should not be interpreted as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0089] In the embodiments of the present application, "at least one" refers to one or more, and "more" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: the existence of A alone, the existence of A and B at the same time, and the existence of B alone, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b or c can represent: a, b, c, ab, ac, bc or abc, where a, b, c can be single or multiple.

[0090] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

[0091] In summary, the circuit-breaking device and gas density relay provided by the present application include: a circuit-breaking device body, wherein a cavity is provided inside the circuit-breaking device body; the cavity is filled with a liquid conductive medium; a moving part, wherein the moving part slides vertically and penetrates the circuit-breaking device body; the bottom of the moving part is located in the cavity; the bottom of the moving part is also provided with a conducting electrode; the moving part slides up and down in the vertical direction to make the conducting electrode contact or not contact with the liquid conductive medium, and the circuit-breaking device is in a conducting or disconnecting state. The circuit-breaking device of the present application uses mercury as a conductor inside, realizes the conduction and disconnection of the circuit through mechanical dynamic sealing, has a very small on-off switching difference, and is at a high level of sensitivity and accuracy; by adjusting the reset spring force, the anti-seismic performance of the circuit-breaking device can be significantly improved and the overall stability is good; by adjusting the contact area between the conducting electrode and the liquid conductive medium, the current resistance can be flexibly controlled, and a stronger current resistance can be obtained; the circuit-breaking device can also be made into an ultra-thin appearance, effectively reducing the thickness of the gas density relay, thereby significantly reducing the production cost. Therefore, the present invention effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0092] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical concepts disclosed in this application shall be covered by the claims of this application.

Claims

1. A circuit-breaking device, characterized in that: include: A switch device body, wherein a cavity is provided inside the switch device body; the cavity is filled with a liquid conductive medium; A moving component, the moving component is slidably disposed on the switching device body in a vertical direction; the bottom of the moving component is located in the cavity; A conducting electrode is also provided at the bottom of the movable part; the conducting electrode is brought into contact with or out of contact with the liquid conductive medium by the movable part sliding up and down in the vertical direction, and the circuit-breaking device is in an on or off state.

2. The circuit-breaking device according to claim 1, characterized in that: The circuit-breaking device further includes an elastic member; the elastic member is disposed in the cavity, one end of the elastic member is connected to the bottom of the moving component, and the other end of the elastic member is connected to the bottom of the cavity.

3. The circuit-breaking device according to claim 1, characterized in that: The circuit-breaking device further comprises an elastic member; the elastic member is sleeved on the moving component.

4. The circuit-breaking device according to claim 2, characterized in that: The circuit breaker device further includes a welding component; the welding component includes a first welding foot and a second welding foot; the first welding foot and the second welding foot are respectively arranged on both sides of the circuit breaker device body, and penetrate the wall of the circuit breaker device body to contact the liquid conductive medium.

5. The circuit-breaking device according to claim 3, characterized in that: The circuit-breaking device further includes a welding component; the welding component includes a first welding foot and a second welding foot; the first welding foot and the second welding foot pass through the moving component and are connected to the conductive electrode.

6. The circuit-breaking device according to claim 1, characterized in that: A first sealing ring and a second sealing ring are respectively provided at both ends of the conducting electrode; the first sealing ring and the second sealing ring are used to prevent leakage of the liquid conductive medium.

7. The circuit-breaking device according to claim 1, characterized in that: The liquid conductive medium is mercury.

8. The circuit-breaking device according to claim 2 or 3, characterized in that: The elastic member is a spring.

9. A gas density relay, characterized in that: include: The circuit-breaking device according to any one of claims 1 to 8.

10. The gas density relay according to claim 9, characterized in that: The circuit breaker is mounted on the gas density relay through the welding component.

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