Leakage protection switch

Abstract

The embodiments of the present disclosure provide a leakage protection switch. The leakage protection switch comprises a housing; a static contact assembly which is arranged in the housing; an arc extinguishing chamber, which is adjacent to the static contact assembly and arranged in the housing, and comprises a plurality of arc extinguishing grid plates; and an insulating heat conduction member which is arranged in the housing, the insulating heat conduction member being coupled to the static contact assembly and at least some of the arc extinguishing grid plates.

Description

Leakage protection switch

[0001] This application claims priority to the Chinese utility model patent application entitled “Circuit breaker contact heat conducting structure” and application number 202323358894.5, filed on December 7, 2023. This application also claims priority to the Chinese invention patent application entitled “Leakage protection switch” and application number 202410641980.7, filed on May 22, 2024. The entire contents of the above two applications are incorporated by reference into this application. Technical Field

[0002] Embodiments of the present disclosure generally relate to the technical field of electrical equipment, and more particularly, to a leakage protection switch. Background Art

[0003] When the leakage protection switch is working normally, the moving contact is connected to the static contact, so that the main circuit of the leakage protection switch is connected to the line and the load.

[0004] However, when the main circuit is conducting, it generates a significant amount of heat. This heat can radiate outward onto one side of the housing, raising the local temperature there. Therefore, dispersing the heat from the main circuit to reduce the temperature on one side of the leakage protection switch is a pressing technical issue. Summary of the Invention

[0005] The purpose of the present disclosure is to provide a leakage protection switch to at least partially solve the above problems.

[0006] In a first aspect of the present disclosure, a leakage protection switch is provided, comprising a housing; a stationary contact assembly disposed within the housing; an arc extinguishing chamber disposed within the housing adjacent to the stationary contact assembly and comprising a plurality of arc extinguishing grids; and an insulating thermally conductive member disposed within the housing, the insulating thermally conductive member being coupled to the stationary contact assembly and at least some of the plurality of arc extinguishing grids.

[0007] According to an embodiment of the present disclosure, the arc extinguishing chamber is positioned adjacent to the stationary contact assembly. The insulating heat conductor is capable of transferring heat from the stationary contact assembly to at least a portion of the arc extinguishing grid, and the arc extinguishing grid itself has excellent heat dissipation properties. This allows the heat from the stationary contact assembly to be quickly dissipated, reducing the temperature of the stationary contact assembly. This also reduces the local temperature of one side of the leakage protection switch housing, thereby lowering the temperature on one side of the leakage protection switch.

[0008] In some embodiments, the insulating thermal conductor comprises an aluminum nitride ceramic sheet.

[0009] In some embodiments, the static contact assembly includes a first static contact, a second static contact, and a magnetic protection coil, wherein the second static contact is arranged around the magnetic protection coil and connected to the magnetic protection coil, wherein the first static contact and the second static contact are respectively coupled to the insulating thermal conductive member.

[0010] In some embodiments, the first stationary contact includes a first mating groove, the second stationary contact includes a second mating groove, and the insulating heat conductive member includes a main body and an extension portion extending from one end of the main body, a portion of the main body adjacent to the extension portion is coupled to the first mating groove, and at least a portion of the extension portion is coupled to the second mating groove.

[0011] In some embodiments, the main body extends along a first direction, the extending portion extends along a second direction, and the first direction is perpendicular to the second direction.

[0012] In some embodiments, the main body includes a first end, the extension portion is provided on a first portion of the first end, and a second portion of the first end other than the first portion contacts the second static contact.

[0013] In some embodiments, the plurality of arc extinguishing grids are spaced apart from each other along the first direction, and the main body is coupled to at least some of the arc extinguishing grids.

[0014] In some embodiments, each of the plurality of arc quenching grids includes a third matching groove, the third matching grooves of the plurality of arc quenching grids are aligned along the first direction, and the main body is coupled to the third matching grooves of at least some of the plurality of arc quenching grids.

[0015] In some embodiments, the side surfaces of the main body coupled to the third mating groove and the first mating groove are planar, and the end surface and side surfaces of the extension coupled to the second mating groove are planar.

[0016] In some embodiments, the leakage protection switch further includes thermally conductive adhesive, and the thermally conductive adhesive is disposed on a surface of at least one of the first mating groove, the second mating groove, and the third mating groove.

[0017] In some embodiments, the arc extinguishing chamber includes an upper chamber and a lower chamber, the upper chamber is integrally fixed on the upper side of the lower chamber, an isolation structure is formed between the upper chamber and the lower chamber, and a groove is opened on the upper side of the upper chamber.

[0018] In some embodiments, the isolation structure is an isolation groove opened on the arc quenching grid of the arc quenching chamber, and the isolation groove divides the arc quenching grid of the arc quenching chamber into two parts, upper and lower parts, which serve as the arc quenching grid of the upper chamber and the arc quenching grid of the lower chamber respectively.

[0019] In some embodiments, the isolation groove is a V-shaped groove structure, and the V bottom of the V-shaped groove is an arc shape.

[0020] It should be understood that the content described in this section is not intended to limit the key features or important features of the embodiments of the present disclosure, nor is it intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. In the accompanying drawings, the same or similar reference numerals represent the same or similar elements, wherein:

[0022] FIG1 shows a cross-sectional view of a leakage protection switch according to some embodiments of the present disclosure;

[0023] FIG2 shows a schematic structural diagram of a static contact assembly, an arc extinguishing chamber, and an insulating heat-conducting member according to some embodiments of the present disclosure;

[0024] FIG3 shows a schematic structural diagram of an insulating heat-conducting member according to some embodiments of the present disclosure;

[0025] FIG4 shows a schematic structural diagram of a first static contact according to some embodiments of the present disclosure;

[0026] FIG5 shows a schematic structural diagram of a second static contact according to some embodiments of the present disclosure;

[0027] FIG6 shows a schematic structural diagram of an arc extinguishing chamber and an insulating heat conductive member according to some embodiments of the present disclosure;

[0028] FIG7 shows a schematic structural diagram of a static contact assembly, an arc extinguishing chamber, and an insulating heat-conducting member according to other embodiments of the present disclosure;

[0029] FIG8 is an overall structural diagram of a circuit breaker contact heat conduction structure according to another embodiment of the present disclosure;

[0030] FIG9 is an overall structural diagram of the second static contact in FIG8 ;

[0031] FIG10 is a diagram showing the overall structure of the insulating heat conductive member in FIG8;

[0032] FIG11 is an overall structural diagram of the arc extinguishing chamber in FIG8 .

[0033] Explanation of the accompanying drawings: 100 is a leakage protection switch, 101 is a groove; 1 is a shell; 2 is a static contact assembly, 21 is a first static contact, 211 is a first matching groove, 22 is a second static contact, 221 is a second matching groove, and 23 is a magnetic protection coil; 3 is an arc extinguishing chamber, 31 is an arc extinguishing grid, 311 is a third matching groove, 32 is an upper chamber, and 33 is a lower chamber; 4 is an insulating heat-conducting part, 41 is a main body, 411 is a first end, and 42 is an extension part; 5 is an isolation groove; X is a first direction; Y is a second direction; and Z is a third direction. DETAILED DESCRIPTION

[0034] The preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to make the present disclosure more thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art.

[0035] As used herein, the term "including" and its variations represent open inclusion, i.e., "including but not limited to." Unless otherwise stated, the term "or" means "and / or." The term "based on" means "based at least in part on." The terms "one example embodiment" and "an embodiment" mean "at least one example embodiment." The term "another embodiment" means "at least one additional embodiment." The terms "first," "second," etc. may refer to different or identical objects.

[0036] As described above, when the main circuit of a leakage protection switch is conducting, a large amount of heat is generated in the main circuit. This heat can radiate outward and onto one side of the housing, thereby raising the local temperature of the housing. An embodiment of the present disclosure provides a leakage protection switch 100 that disperses heat from the main circuit and reduces the temperature on one side of the leakage protection switch. The principles of the present disclosure will be described below with reference to Figures 1 to 6.

[0037] Figure 1 shows a cross-sectional view of a leakage protection switch 100 according to some embodiments of the present disclosure. Figure 2 shows a schematic structural diagram of a static contact assembly 2, an arc extinguishing chamber 3 and an insulating thermal conductive member 4 according to some embodiments of the present disclosure. As shown in Figures 1 and 2, the leakage protection switch 100 described herein generally includes a housing 1, a static contact assembly 2, an arc extinguishing chamber 3 and an insulating thermal conductive member 4. Obviously, the housing 1 serves as a mounting carrier, and the static contact assembly 2, the arc extinguishing chamber 3 and the insulating thermal conductive member 4 are respectively arranged in the housing 1. In order to avoid the housing 1 interfering with the arrangement of the insulating thermal conductive member 4, a corresponding arrangement groove may be provided on the housing 1 according to the structure and shape of the insulating thermal conductive member 4 to facilitate the accommodation and fixation of the insulating thermal conductive member 4.

[0038] Continuing with reference to Figures 1 and 2, in some embodiments, the arc extinguishing chamber 3 includes a plurality of arc extinguishing grids 31. The arc extinguishing chamber 3 is disposed adjacent to the stationary contact assembly 2. The insulating thermally conductive member 4 is coupled to the stationary contact assembly 2 and is also coupled to at least some of the plurality of arc extinguishing grids 31.

[0039] According to an embodiment of the present disclosure, the arc extinguishing chamber 3 is positioned adjacent to the stationary contact assembly 2. The insulating heat conductor 4 is capable of transferring heat from the stationary contact assembly 2 to at least a portion of the arc extinguishing grid 31, which itself exhibits excellent heat dissipation properties. This allows the heat from the stationary contact assembly 2 to be quickly dissipated, reducing the temperature of the stationary contact assembly 2. This in turn reduces the local temperature of the housing 1 on one side of the leakage protection switch 100, thereby lowering the temperature on one side of the leakage protection switch 100.

[0040] Furthermore, the insulating thermally conductive member 4 is designed to be insulated, so it does not create electrical continuity between the static contact assembly 2 and the arc-quenching grid 31. Furthermore, the arc-quenching chamber 3 is positioned adjacent to the static contact assembly 2. This facilitates the placement of the insulating thermally conductive member 4 between the arc-quenching chamber 3 and the static contact assembly 2, thereby lowering the temperature on one side of the leakage protection switch 100. Furthermore, this reduces the material used for the insulating thermally conductive member 4, thereby reducing production costs.

[0041] Continuing with reference to FIG. 2 , in some embodiments, the insulating thermally conductive member 4 can be coupled to all of the arc-quenching grids 31 to maximize heat dissipation. It should be noted that the numbers, values, and quantities mentioned above and elsewhere in this disclosure are exemplary and are not intended to limit the scope of this disclosure in any way. Any other appropriate numbers, values, and quantities are possible. For example, depending on the specific application scenario and requirements, the insulating thermally conductive member 4 can also be coupled to a portion of the arc-quenching grids 31 .

[0042] According to the embodiment of the present disclosure, the insulating thermal conductive member 4 may include various types of materials that are currently known or available in the future. The embodiment of the present disclosure is not limited to this, as long as it has excellent thermal conductivity, excellent mechanical properties and excellent insulation properties. For example, in some embodiments, the insulating thermal conductive member 4 may include an aluminum nitride (ALN) ceramic sheet. The aluminum nitride ceramic material has high thermal conductivity and can quickly transfer heat from the static contact assembly 2 to the outside, and the arc extinguishing grid 31 quickly disperses the heat to quickly reduce the temperature of one side of the leakage protection switch 100. In addition, the aluminum nitride ceramic material has excellent mechanical properties. During the operation of the leakage protection switch 100, internal vibrations can easily cause damage to the insulating thermal conductive member 4. Compared with ordinary ceramic sheets, the aluminum nitride ceramic sheet can prevent damage while taking into account rapid thermal conductivity. In addition, the aluminum nitride ceramic sheet has excellent insulation performance, which effectively prevents the static contact assembly 2 from being conductive with the arc extinguishing grid 31.

[0043] Continuing to refer to Figures 1 and 2, in some embodiments, the static contact assembly 2 can be arranged adjacent to the arc extinguishing chamber 3 along the first direction X. The static contact assembly 2 can include a first static contact 21, a second static contact 22, and a magnetic protection coil 23. The first static contact 21 serves as a static contact for the N phase, and the second static contact 22 serves as a static contact for the P phase. The second static contact 22 can be arranged around the magnetic protection coil 23 and connected to the magnetic protection coil 23, and the magnetic protection coil 23 can also be connected to the output terminal. The first static contact 21 is only adjacent to one side of the shell 1. Since the thickness of the second static contact 22 along the third direction Z is larger, the second static contact 22 is adjacent to both sides of the shell 1 at the same time. Obviously, the third direction Z is perpendicular to the first direction X.

[0044] When the main circuit of the leakage protection switch 100 is on, the first static contact 21, the second static contact 22, and the magnetic protection coil 23 generate a large amount of heat. Therefore, it is necessary to transfer the heat from the first static contact 21, the second static contact 22, and the magnetic protection coil 23 to the arc extinguishing grid 31 through the insulating heat conductive member 4. Based on this, the first static contact 21 and the second static contact 22 can be coupled to the insulating heat conductive member 4 respectively.

[0045] Figure 3 illustrates a schematic structural diagram of an insulating heat-conducting member 4 according to some embodiments of the present disclosure. Figure 4 illustrates a schematic structural diagram of a first stationary contact 21 according to some embodiments of the present disclosure. Figure 5 illustrates a schematic structural diagram of a second stationary contact 22 according to some embodiments of the present disclosure. As shown in Figures 4 and 5, in some embodiments, the first stationary contact 21 may include a first mating slot 211, and the second stationary contact 22 may include a second mating slot 221.

[0046] As shown in FIG3 , the insulating thermally conductive member 4 may include a main body 41 and an extension 42. The main body 41 and the extension 42 may be integrally formed, and the extension 42 may extend from one end of the main body 41. With continued reference to FIG2 through FIG5 , a portion of the main body 41 adjacent to the extension 42 is coupled to the first mating groove 211. At least a portion of the extension 42 is coupled to the second mating groove 221.

[0047] It can be understood that, on the one hand, the extension portion 42 extends from one end of the main body portion 41; on the other hand, the portion of the main body portion 41 adjacent to the extension portion 42 is coupled to the first mating groove 211, and at least a portion of the extension portion 42 is coupled to the second mating groove 221. As a result, the contact area between the insulating heat-conducting member 4 and the first static contact 21 is increased, and the contact area between the insulating heat-conducting member 4 and the second static contact 22 is increased, thereby improving heat transfer efficiency.

[0048] It should be noted that the structure and shape of the insulating heat-conducting member 4 mentioned above are exemplary and are not intended to limit the scope of the present disclosure in any way. Any other suitable structure and shape are possible, as long as the insulating heat-conducting member 4 and the first static contact 21 have sufficient contact area, the insulating heat-conducting member 4 and the second static contact 22 have sufficient contact area, and the insulating heat-conducting member 4 and the arc extinguishing chamber 3 have sufficient contact area.

[0049] Referring to Figure 3 , further, the main body 41 may extend along a first direction X. The extension 42 may extend along a second direction Y. The first direction X may be perpendicular to the second direction Y, and the second direction Y may be perpendicular to the third direction Z. Of course, the main body 41 and the extension 42 may also extend along other directions, which will not be described in detail here.

[0050] Figure 6 illustrates a schematic structural diagram of the arc extinguishing chamber 3 and the insulating thermally conductive member 4 according to some embodiments of the present disclosure. As shown in Figures 2, 3, and 6, in some embodiments, the main body 41 may include a first end 411. The first end 411 may include a first portion and a second portion other than the first portion. The extension 42 may be disposed on the first portion, and the second portion may contact the side of the second static contact 22. This further increases the contact area between the insulating thermally conductive member 4 and the second static contact 22, thereby improving thermal conductivity.

[0051] Continuing with reference to FIG. 3 and FIG. 6 , in some embodiments, the plurality of arc quenching grids 31 may be spaced apart from one another along the first direction X. On this basis, the main body 41 may be coupled to at least some of the plurality of arc quenching grids 31 to transfer heat from the stationary contact assembly 2 to the arc quenching grids 31 , and the heat is dissipated by the arc quenching grids 31 .

[0052] Continuing with reference to Figures 3 and 6 , each of the plurality of arc-quenching grids 31 further includes a third mating slot 311 . The third mating slots 311 of the plurality of arc-quenching grids 31 can be aligned along the first direction X to facilitate coupling with the main body 41 , which also extends along the first direction X. Thus, the main body 41 can be coupled to the third mating slots 311 of at least some of the plurality of arc-quenching grids 31 .

[0053] It can be understood that since the main body 41 is coupled to the third matching groove 311 , the contact area between the insulating heat-conducting member 4 and the arc-extinguishing chamber 3 is increased, thereby accelerating the heat conduction efficiency.

[0054] Referring back to Figures 2 to 5 , since the main body portion 41 extends along the first direction X, the side surface of the main body portion 41 coupled to the third mating groove 311 can be flat. Furthermore, the side surface of the main body portion 41 coupled to the first mating groove 211 can also be flat. Furthermore, referring back to Figures 2 , 3 , 5 , and 6 , since the extension portion 42 extends along the second direction Y, the end surface of the extension portion 42 coupled to the second mating groove 221 can be flat, and the side surface of the extension portion 42 coupled to the second mating groove 221 can also be flat. Correspondingly, referring to Figures 4 to 6 , the surface of the first mating groove 211 can be flat. The surface of the second mating groove 221 can also be flat. The surface of the third mating groove 311 can also be flat.

[0055] It should be noted that one of the surfaces of the first mating groove 211 , the second mating groove 221 and the third mating groove 311 may also be a curved surface, such as an arcuate surface or a spherical surface, etc., which is not limited here.

[0056] In some embodiments, the leakage protection switch 100 may further include thermally conductive adhesive (not shown in the figure). The thermally conductive adhesive may be provided on the surface of the first mating groove 211; and / or the thermally conductive adhesive may be provided on the surface of the second mating groove 221; and / or the thermally conductive adhesive may be provided on the surface of the third mating groove 311. With the above configuration, on the one hand, the thermally conductive adhesive can enable the insulating heat-conducting member 4 to be tightly connected to the first mating groove 211, the second mating groove 221, and the third mating groove 311, respectively. On the other hand, the thermally conductive adhesive has excellent thermal conductivity. For example, the thermal conductivity coefficient of the thermally conductive adhesive may be 5W / mK. In addition, referring to Figure 6, the thermally conductive adhesive may also be provided on the second portion of the first end 411.

[0057] The following temperature test was conducted on the leakage protection switch 100 shown in Figures 1 and 2. Without the insulating heat-conducting member 4, the main circuit of the leakage protection switch 100 was turned on, and the temperature of the housing 1 near the first static contact 21 was measured to be 51.2°C. With the insulating heat-conducting member 4 added, the temperature of the housing 1 near the first static contact 21 was measured to be 45.7°C, a temperature drop of 5.5°C.

[0058] It should be noted that the above description is directed to the insulating heat-conducting member 4 being adjacent to the housing 1 near the first static contact 21. Of course, if it is necessary to lower the temperature of the housing 1 facing away from the first static contact 21, the insulating heat-conducting member 4 can also be away from the housing 1 adjacent to the first static contact 21, and the insulating heat-conducting member 4 can be coupled to the second static contact 22.

[0059] Figure 7 illustrates a schematic structural diagram of a stationary contact assembly 2, an arc-extinguishing chamber 3, and an insulating thermally conductive member 4 according to further embodiments of the present disclosure. The arc-extinguishing chamber 3 and insulating thermally conductive member 4 shown in Figure 7 have similar structures to those shown in Figure 2 , with the primary difference being that the stationary contact assembly 2 in Figure 7 includes only a second stationary contact 22 and a magnetic protection coil 23. The following description will primarily focus on the differences between the two, and will omit any further details regarding the common features.

[0060] In other embodiments, the leakage protection switch 100 described herein generally includes a housing 1, a static contact assembly 2, an arc extinguishing chamber 3, and an insulating heat-conducting member 4. The structure and connection relationship of the housing 1, the arc extinguishing chamber 3, and the insulating heat-conducting member 4 are similar to the structure and connection relationship described above in conjunction with Figures 1 and 2, and will not be repeated here.

[0061] As shown in Figure 7, in other embodiments, the static contact assembly 2 may include a second static contact 22 and a magnetic protection coil 23. The second static contact 22 may be disposed around and connected to the magnetic protection coil 23, and the magnetic protection coil 23 may also be connected to an outlet terminal.

[0062] Continuing with Figure 7 , it's clear that when the main circuit of the leakage protection switch 100 is conducting, the second static contact 22 and the magnetic protection coil 23 generate a significant amount of heat. Therefore, it's necessary to transfer the heat from the second static contact 22 and the magnetic protection coil 23 to the arc-quenching grid 31 via the insulating thermally conductive member 4 , thereby reducing the temperature on one side of the leakage protection switch. To this end, the second static contact 22 can be coupled to the insulating thermally conductive member 4 , which in turn is further coupled to at least some of the multiple arc-quenching grids 31 .

[0063] In other embodiments, to increase the contact area between the insulating heat-conducting member 4 and the second static contact 22, thereby improving heat conduction efficiency, the second static contact 22 also includes a second mating slot 221. Correspondingly, the insulating heat-conducting member 4 also includes a main body 41 and an extension 42, and at least a portion of the extension 42 is also coupled to the second mating slot 221.

[0064] Furthermore, the second portion of the first end 411 of the main body 41 can also contact the side surface of the second static contact 22. Thus, the contact area between the insulating heat-conducting member 4 and the second static contact 22 is further increased to increase the heat conduction efficiency.

[0065] In other embodiments, the end surface of the extension portion 42 coupled to the second mating groove 221 can be a flat surface, and the side surface of the extension portion 42 coupled to the second mating groove 221 can be a flat surface. Correspondingly, the surface of the second mating groove 221 can also be a flat surface. Of course, the surface of the second mating groove 221 can also be a curved surface, such as an arcuate surface or a spherical surface, etc., which is not limited here.

[0066] FIG8 is an overall structural diagram of a circuit breaker contact heat conduction structure according to another embodiment of the present disclosure. FIG9 is an overall structural diagram of the second static contact 22 in FIG8. FIG10 is an overall structural diagram of the insulating heat conductive member 4 in FIG8. FIG11 is an overall structural diagram of the arc extinguishing chamber 3 in FIG8. Referring to FIG8 to 11, a circuit breaker contact heat conduction structure of this embodiment includes an arc extinguishing chamber 3 and a second static contact 22, and also includes an insulating heat conductive member 4. The insulating heat conductive member 4 has thermal conductivity and insulation properties. One end of the insulating heat conductive member 4 is connected to the second static contact 22, and the other end is connected to the arc extinguishing chamber 3 to transfer heat from the second static contact 22 to the arc extinguishing chamber 3. Through the function of the insulating heat conductive member 4 in this embodiment, the thermal conductivity of the insulating heat conductive member 4 can be utilized to transfer heat from the second static contact 22 to the arc extinguishing chamber 3. Thereafter, the heat is quickly dissipated through the heat dissipation performance of the arc extinguishing chamber 3, effectively improving the temperature rise of the circuit breaker.

[0067] As an improved specific embodiment, a second mating groove 221 is provided on the second static contact 22, and the end of the insulating heat conductive part 4 is embedded in the second mating groove 221 to be connected to the second static contact 22. The setting of the second mating groove 221 can effectively realize the installation and limitation of the end of the insulating heat conductive part 4, thereby ensuring the connection between the insulating heat conductive part 4 and the second static contact 22.

[0068] As an improved specific embodiment, the groove edge of the second matching groove 221 is a rounded structure, and the rounded structure enables better disassembly and assembly between the end of the insulating heat conductive component 4 and the second matching groove 221.

[0069] As an improved specific implementation method, a groove 101 is provided on the arc extinguishing chamber 3, and the end of the insulating heat conductive part 4 away from the second static contact 22 is embedded in the groove 101 to be connected with the arc extinguishing chamber 3. The setting of the groove 101 can realize the installation and limitation between the end of the insulating heat conductive part 4 and the arc extinguishing chamber 3.

[0070] As a specific embodiment of the improvement, the groove 101 is composed of various third matching grooves 311 opened on the arc extinguishing grid 31 of the arc extinguishing chamber 3. When the end of the insulating heat conductive part 4 is embedded in the groove 101, the end of the insulating heat conductive part 4 and each arc extinguishing grid 31 are in contact with each other for heat conduction. With the above structure, the heat transferred from the insulating heat conductive part 4 can be dissipated synchronously through the multiple arc extinguishing grids 31 in contact, thereby effectively achieving rapid heat dissipation of the heat transferred by the insulating heat conductive part 4.

[0071] As a specific embodiment of the improvement, the arc extinguishing chamber 3 includes an upper chamber 32 and a lower chamber 33, and the upper chamber 32 is integrally fixed on the upper side surface of the lower chamber 33. An isolation structure is formed between the upper chamber 32 and the lower chamber 33, and the groove 101 is opened on the upper side surface of the upper chamber 32. Through the setting of the above structure, the isolation effect of the upper chamber 32 and the lower chamber 33 can be achieved. In this way, when the lower chamber 33 performs an arc extinguishing operation on the arc in the switching process, the heat transfer to the upper chamber 32 is minimized, and the heat transferred to the second static contact 22 through the insulating heat conductive member 4 is reduced.

[0072] As a specific embodiment of the improvement, the isolation structure is an isolation groove 5 opened on the arc extinguishing grid 31 of the arc extinguishing chamber 3. The isolation groove 5 divides the arc extinguishing grid 31 of the arc extinguishing chamber 3 into two parts, an upper part and an lower part, which serve as the arc extinguishing grid 31 of the upper chamber 32 and the arc extinguishing grid 31 of the lower chamber 33 respectively. By setting the isolation groove 5, the heat transfer between the upper chamber 32 and the lower chamber 33 can be effectively reduced, and the overall structure is simple and easy to process.

[0073] As an improved specific implementation, the isolation groove 5 is a V-groove structure, and the V bottom of the V-groove is an arc shape. The V-groove structure can realize the arc extinguishing grid 31 to be open radially, which can effectively enhance the heat dissipation performance of the arc extinguishing grid 31.

[0074] As an improved specific embodiment, the main body 41 of the insulating heat-conducting part 4 is in the shape of a long straight plate, and an extension part 42 for being embedded in the second matching groove 221 is fixed to one end of the long straight plate relative to the second static contact 22. The extension part 42 is staggered and fixed to the end of the main body 41 to form a clearance groove on the left and right sides of the insulating heat-conducting part 4 for external components to enter. Through the setting of the above-mentioned clearance groove, the impact of the setting of the insulating heat-conducting part 4 on the internal components and space of the circuit breaker can be effectively reduced.

[0075] As a specific embodiment of the improvement, the insulating heat conductive member 4 is made of an alumina ceramic sheet or an aluminum nitride ceramic sheet. The use of the above two materials to make the insulating heat conductive member 4 can achieve both thermal conductivity and insulation. Among them, the aluminum nitride ceramic sheet is preferably recommended. Both have good insulation properties, and the aluminum nitride ceramic sheet has better thermal conductivity. The comparison between the two is as follows:

[0076] Thermal conductivity: Aluminum nitride ceramic sheets are 8-10 times that of alumina ceramic sheets. The thermal conductivity of aluminum nitride ceramic sheets is as high as 170-210W / mk, which is basically the same as that of aluminum, and has excellent thermal conductivity.

[0077] Insulation performance: both have good insulation performance;

[0078] Price: Aluminum nitride ceramic sheets are about 8 times more expensive than alumina ceramic sheets.

[0079] In summary, the circuit breaker contact heat conduction structure of this embodiment can connect the second static contact 22 and the arc extinguishing chamber 3 through the provision of the insulating heat conductive member 4, thereby utilizing the insulating heat conductive member 4 to conduct heat and transfer heat to the arc extinguishing chamber, thereby making full use of the arc extinguishing chamber's heat absorption function to improve temperature rise.

[0080] The heat dissipation design according to the embodiment of the present disclosure can be applied to the leakage protection switch 100 to at least partially solve the above problems. It should be understood that the heat dissipation design according to the embodiment of the present disclosure can also be applied to other electrical components, and the embodiment of the present disclosure is not limited thereto.

[0081] While various embodiments of the present disclosure have been described above, the above descriptions are illustrative, non-exhaustive, and not intended to be limiting of the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or technological improvements in the marketplace, or to enable other persons skilled in the art to understand the embodiments disclosed herein.

Claims

1. A leakage protection switch (100), characterized in that: The leakage protection switch (100) comprises: Housing (1); A stationary contact assembly (2) is arranged in the housing (1); An arc extinguishing chamber (3) is arranged in the housing (1) adjacent to the stationary contact assembly (2) and comprises a plurality of arc extinguishing grids (31); and An insulating heat-conducting member (4) is arranged in the housing (1), and the insulating heat-conducting member (4) is coupled to the stationary contact assembly (2) and at least part of the arc-extinguishing grids (31) among the plurality of arc-extinguishing grids (31).

2. The leakage protection switch (100) according to claim 1, characterized in that: The insulating heat-conducting member (4) comprises an aluminum nitride ceramic sheet.

3. The leakage protection switch (100) according to claim 1, characterized in that: The stationary contact assembly (2) comprises a first stationary contact (21), a second stationary contact (22) and a magnetic protection coil (23), wherein the second stationary contact (22) is arranged around the magnetic protection coil (23) and connected to the magnetic protection coil (23). Wherein, the first stationary contact (21) and the second stationary contact (22) are respectively coupled to the insulating heat-conducting member (4).

4. The leakage protection switch (100) according to claim 3, characterized in that: The first stationary contact (21) comprises a first matching groove (211), the second stationary contact (22) comprises a second matching groove (221), and The insulating heat-conducting member (4) comprises a main body (41) and an extension portion (42) extending from one end of the main body (41), a portion of the main body (41) adjacent to the extension portion (42) is coupled to the first mating groove (211), and at least a portion of the extension portion (42) is coupled to the second mating groove (221).

5. The leakage protection switch (100) according to claim 4, characterized in that: The main body (41) extends along a first direction (X), and the extension portion (42) extends along a second direction (Y), wherein the first direction (X) is perpendicular to the second direction (Y).

6. The leakage protection switch (100) according to claim 5, characterized in that: The main body (41) includes a first end (411), the extension portion (42) is provided on a first portion of the first end (411), and a second portion of the first end (411) other than the first portion contacts the second stationary contact (22).

7. The leakage protection switch (100) according to claim 5, characterized in that: The plurality of arc-extinguishing grids (31) are spaced apart from each other along the first direction (X), and the main body (41) is coupled to at least some of the arc-extinguishing grids (31) among the plurality of arc-extinguishing grids (31).

8. The leakage protection switch (100) according to claim 7, characterized in that: The plurality of arc-extinguishing grids (31) each include a third matching groove (311), the third matching grooves (311) of the plurality of arc-extinguishing grids (31) are aligned along the first direction (X), and the main body (41) is coupled to the third matching grooves (311) of at least some of the arc-extinguishing grids (31) among the plurality of arc-extinguishing grids (31).

9. The leakage protection switch (100) according to claim 8, characterized in that: The side surfaces of the main body (41) coupled to the third matching groove (311) and the first matching groove (211) are planes, and the end surface and side surfaces of the extension portion (42) coupled to the second matching groove (221) are planes.

10. The leakage protection switch (100) according to claim 8, characterized in that: The leakage protection switch (100) further comprises a heat-conducting adhesive, wherein the heat-conducting adhesive is arranged on a surface of at least one of the first matching groove (211), the second matching groove (221) and the third matching groove (311).

11. The leakage protection switch (100) according to claim 8, characterized in that: The arc extinguishing chamber (3) comprises an upper chamber (32) and a lower chamber (33); the upper chamber (32) is integrally fixed on the upper side surface of the lower chamber (33); an isolation structure is formed between the upper chamber (32) and the lower chamber (33); and a groove (101) is provided on the upper side surface of the upper chamber (32).

12. The leakage protection switch (100) according to claim 11, characterized in that: The isolation structure is an isolation groove (5) provided on an arc extinguishing grid (31) of an arc extinguishing chamber (3), wherein the isolation groove (5) divides the arc extinguishing grid (31) of the arc extinguishing chamber (3) into two parts, an upper part and an lower part, which respectively serve as the arc extinguishing grid (31) of the upper chamber (32) and the arc extinguishing grid (31) of the lower chamber (33).

13. The leakage protection switch (100) according to claim 12, characterized in that: The isolation groove (5) is a V-shaped groove structure, and the V bottom of the V-shaped groove is an arc shape.

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