Heat conduction assembly and low-voltage circuit breaker

Abstract

The utility model relates to the technical field of electrical equipment, in particular to a heat conduction assembly and a low-voltage circuit breaker. The heat conduction assembly comprises an electric insulation shell, liquid metal and insulation ceramic, wherein the liquid metal and the insulation ceramic are arranged in the electric insulation shell. The electric insulation shell is used for being connected between the two electric conductors in an insulation mode. The insulating ceramic is located in the middle of the insulating shell, and the liquid metal is filled in gaps between the two ends of the electric insulating shell and the insulating ceramic. According to the heat conduction assembly, the heat between the two electric conductors can be effectively transferred under the condition that the two electric conductors are in an insulated and isolated state, so that the problem of unbalanced temperature rise of the two electric conductors in the working process can be relieved. In the working process of the low-voltage circuit breaker, heat of the wiring busbar with high temperature can be rapidly dissipated through the heat conduction assembly, the balance of temperature rise of the wiring busbar of each phase is improved, the problem that currents of each phase of the low-voltage circuit breaker are unbalanced is solved, the use performance of the low-voltage circuit breaker is improved, and the service life of the low-voltage circuit breaker is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrical equipment technical field especially is related to a kind of heat conduction assembly and low-voltage circuit breaker. BACKGROUND

[0002] Low-voltage circuit breaker is a commonly used protective appliance, which has the functions of on-off load current and overload and short-circuit protection of load current, and is widely used in overload and short-circuit protection of various power distribution systems and motors.

[0003] The wiring busbar of the circuit breaker is usually the highest temperature rising position in the circuit. In particular, the temperature of the wiring busbar of the middle phase on the circuit breaker cannot be discharged in time, so the temperature rise of the wiring busbar of the middle phase is higher than that of the wiring busbar of the edge phase, and the temperature rise of the wiring busbar of the middle phase is usually about 10-30°C higher than that of the wiring busbar of the edge phase.

[0004] Due to the difficulty in heat dissipation of the wiring busbar of the middle phase, the damage speed of the wiring busbar of the middle phase is higher. Moreover, the increase in temperature will cause the mechanical properties of the material to decrease, the oxidation to intensify, and the contact resistance to increase, so the temperature rise of the wiring busbars of the phases is unbalanced, which will intensify the unbalance of the currents of the phases of the circuit breaker over a long period of time, resulting in damage to the performance and service life of the circuit breaker. SUMMARY

[0005] The first object of the utility model is to provide a heat conduction assembly for insulating connection between two conductive bodies and transferring heat from the conductive body with higher temperature to the conductive body with lower temperature to achieve thermal balance between the two conductive bodies.

[0006] To achieve the above object, the utility model adopts the following technical solutions:

[0007] A heat conduction assembly includes an electrically insulating shell, a liquid metal and an insulating ceramic disposed in the electrically insulating shell, wherein:

[0008] The electrically insulating shell is used for insulating connection between two conductive bodies;

[0009] The insulating ceramic is located in the middle of the electrically insulating shell, and the liquid metal is filled in the gap between the two ends of the electrically insulating shell and the insulating ceramic.

[0010] Further, the electrically insulating shell includes two end covers and a pipe sleeve connected between the two end covers, and the two end covers and the pipe sleeve form a sealed cavity, and the liquid metal and the insulating ceramic are disposed in the sealed cavity;

[0011] The two end covers are respectively connected to the two conductive bodies;

[0012] The pipe sleeve is made of insulating material.

[0013] Further, the pipe sleeve is made of rubber or heat-conducting silica gel.

[0014] Further, the length of the insulating ceramic is greater than the total length of the liquid metal.

[0015] Further, a connecting boss is arranged on one end of the end cap close to the pipe sleeve, and the connecting boss is inserted into the pipe sleeve; the outer circumferential surface of the connecting boss is in close contact with the inner circumferential surface of the pipe sleeve, and the stepped surface on the end cap connected to the connecting boss is in close contact with the end surface of the pipe sleeve.

[0016] Further, a liquid injection hole is arranged on the end cap, and a plug is arranged in the liquid injection hole.

[0017] Further, the end cap is made of one of metal, insulating ceramic, heat-conducting plastic, silica gel and rubber.

[0018] Further, the end cap is made of metal.

[0019] Further, the inner circumferential surface of the pipe sleeve is convexly provided with two limit rings arranged at intervals, and the insulating ceramic is clamped between the two limit rings.

[0020] The second object of the utility model is to provide a low-voltage circuit breaker to solve the technical problems of the existing low-voltage circuit breaker, i.e.

[0021] In order to achieve the above object, the utility model adopts the following technical scheme:

[0022] A low-voltage circuit breaker comprises at least two conductive bodies for connecting circuits and at least one heat-conducting assembly as described in any one of the preceding embodiments.

[0023] The heat-conducting assembly is connected between at least two adjacent conductive bodies with a temperature difference exceeding a set value.

[0024] The utility model has the advantages of:

[0025] The heat-conducting assembly comprises an electrically insulating shell and liquid metal and insulating ceramic arranged in the electrically insulating shell, wherein the electrically insulating shell is used for insulating connection between two conductive bodies; the insulating ceramic is located in the middle of the electrically insulating shell, and the liquid metal is filled in the gap between the two ends of the electrically insulating shell and the insulating ceramic. The heat-conducting assembly can effectively transfer the heat between two conductive bodies in an insulating and isolated state, thereby relieving the problem of temperature rise imbalance of two conductive bodies in the working process.

[0026] The low-voltage circuit breaker provided by the utility model comprises at least two conductive bodies for connecting circuits and at least one heat conduction component; and the heat conduction component is connected between at least two adjacent conductive bodies with a temperature difference exceeding a set value. The conductive body is a wiring busbar of the low-voltage circuit breaker. In the working process of the low-voltage circuit breaker, the heat conduction component is connected between two adjacent wiring busbars with a temperature difference exceeding a set value, and the heat conduction component can quickly transfer the heat of the wiring busbar with a higher temperature to the wiring busbar with a lower temperature, so that the heat of the wiring busbar with a higher temperature can be quickly dissipated, the balance of the temperature rise of the wiring busbars of different phases is improved, the problem of the unbalanced current of different phases of the low-voltage circuit breaker is alleviated, and the use performance and service life of the low-voltage circuit breaker are improved. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the specific embodiment of the utility model or the technical scheme in the prior art, the drawings needed to be used in the specific embodiment or the prior art description will be briefly introduced as follows, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating creative labor.

[0028] Figure 1 The assembly schematic view of the heat conduction component and the two conductive bodies provided by the embodiment of the utility model is provided.

[0029] Figure 2 The explosion schematic view of the heat conduction component and the two conductive bodies provided by the embodiment of the utility model is provided.

[0030] Figure 3 The three-dimensional schematic view of the end cover provided by the embodiment of the utility model is provided.

[0031] Figure 4 The sectional view of the pipe sleeve provided by the embodiment of the utility model is provided.

[0032] Figure 5 The sectional view of the electrically insulating shell provided by the embodiment of the utility model is provided.

[0033] Figure 6 The connection schematic view of the heat conduction component and the two conductive bodies provided by the embodiment of the utility model is provided.

[0034] Figure 7 The connection schematic view of the heat conduction component and the two conductive bodies provided by another embodiment of the utility model is provided.

[0035] Figure 8 The internal structure schematic view of the low-voltage circuit breaker provided by the embodiment of the utility model is provided.

[0036] Icon:

[0037] 1 - electrically insulating shell; 11 - end cap; 111 - liquid injection hole; 112 - connecting boss; 12 - tube sleeve; 121 - sealing ring; 122 - limiting ring;

[0038] 2 - liquid metal;

[0039] 3 - insulating ceramic;

[0040] 4 - fastener;

[0041] 100 - electrically conductive body; 101 - connecting platform;

[0042] 200 - housing. DETAILED DESCRIPTION

[0043] The technical solutions of the utility model will be described clearly and completely in combination with the embodiments below. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without making creative efforts fall within the protection scope of the utility model.

[0044] It should be noted that in the description of the utility model, the orientation or position relationship indicated by the terms 'center', 'upper', 'lower', 'left', 'right','vertical', 'horizontal', 'inner', 'outer' and the like is the orientation or position relationship shown based on the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms 'first' and'second' are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0045] It should be noted that in the description of the utility model, the terms 'connection' and 'installation' should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be directly connected, or connected through an intermediate medium; it can be mechanical connection, or electrical connection. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0046] The utility model provides a heat conduction assembly in one aspect of the embodiment, referring to Figure 1 and Figure 2 The heat conduction assembly comprises an electrically insulating shell 1 and a liquid metal 2 and an insulating ceramic 3 arranged in the electrically insulating shell 1, wherein:

[0047] The electrically insulating shell 1 is used for insulating connection between two electrically conductive bodies 100;

[0048] The insulating ceramic 3 is located in the middle of the electrically insulating shell 1, and the liquid metal 2 is filled in the gap between the two ends of the electrically insulating shell 1 and the insulating ceramic 3.

[0049] The electrically insulating shell 1 is used for insulating connection between the two conductive bodies 100, and the electrically insulating shell 1 can seal and store the liquid metal 2 and the insulating ceramic 3, so as to avoid leakage of the liquid metal 2; the liquid metal 2 is filled in the gap between the two ends of the electrically insulating shell 1 and the insulating ceramic 3 by using the flowability of the liquid metal 2, so as to ensure reliable contact between the electrically insulating shell 1 and the insulating ceramic 3 and improve heat exchange efficiency. The heat transfer assembly can effectively transfer heat between the two conductive bodies 100 in the state that the two conductive bodies 100 are insulated and isolated, and heat of the conductive body 100 with higher temperature is timely transferred to the conductive body 100 with lower temperature, so that the problem of temperature rise imbalance of the two conductive bodies 100 in the working process can be relieved.

[0050] Continuing to refer to Figure 1 In the embodiment, the length of the insulating ceramic 3 is greater than the total length of the liquid metal 2. The liquid metal 2 is used for filling the gap between the two ends of the electrically insulating shell 1 and the insulating ceramic 3, so that heat is better transferred between the electrically insulating shell 1 and the insulating ceramic 3, and therefore the length of the liquid metal 2 should not be too large, otherwise the heat transfer performance of the whole heat transfer assembly will be reduced, and too much liquid metal is not easy to seal.

[0051] Referring to Figure 2 The electrically insulating shell 1 comprises two end covers 11 and a pipe sleeve 12 connected between the two end covers 11, and the two end covers 11 and the pipe sleeve 12 surround to form a sealed cavity, and the liquid metal 2 and the insulating ceramic 3 are arranged in the sealed cavity;

[0052] The two end covers 11 are respectively connected to the two conductive bodies 100.

[0053] The pipe sleeve 12 is made of insulating material.

[0054] In the embodiment, the inner surface of the middle part of the pipe sleeve 12 is tightly attached to the peripheral surface of the insulating ceramic 3, and the gap between the insulating ceramic 3 and the end cover 11 is filled with the liquid metal 2. In the above structure, the gap between the end cover 11 and the insulating ceramic 3 is filled by the flowability of the liquid metal 2, so as to ensure reliable contact between the end cover 11 and the insulating ceramic 3 and improve heat exchange efficiency.

[0055] Further, the pipe sleeve 12 is made of rubber or heat-conductive silica gel. The rubber or heat-conductive silica gel has excellent insulation, sealing and elasticity, and has the following advantages: improving the sealing of the sealed cavity to prevent leakage of the liquid metal 2; making the heat-conductive assembly have a certain elasticity, so that the two ends of the heat-conductive assembly can be in close contact with the two conductive bodies 100 under the elasticity of the heat-conductive assembly itself; and making the contact between the liquid metal 2 and the insulating ceramic 3 more close under the wrapping and extrusion of the pipe sleeve 12, which is conducive to heat conduction.

[0056] Optionally, the end cover 11 is made of at least one of metal, insulating ceramic, heat-conductive plastic, silica gel and rubber. For example, the end cover 11 is made of metal. In this way, the end cover 11 can quickly transfer the heat between the conductive body 100 and the insulating ceramic 3 by using the excellent heat conductivity of the end cover 11, and the two conductive bodies 100 can be insulated and isolated by using the insulation of the insulating ceramic 3.

[0057] Referring to Figure 2 and Figure 3 , the end cover 11 is provided with a connecting boss 112 near one end of the pipe sleeve 12, and the connecting boss 112 is inserted into the pipe sleeve 12; the outer circumferential surface of the connecting boss 112 is in close contact with the inner circumferential surface of the pipe sleeve 12, and the stepped surface of the end cover 11 connected to the connecting boss 112 is in close contact with the end surface of the pipe sleeve 12.

[0058] In order to facilitate the injection of the liquid metal 2, the end cover 11 can be provided with a liquid injection hole 111, and a plug is arranged in the liquid injection hole 111.

[0059] In one embodiment, the pipe sleeve 12 and the two end covers 11 are connected by a detachable mode such as clamping or screwing. For example, referring to Figure 4 and Figure 5 , the circumferential surface of the connecting boss 112 is concave to form a sealing ring groove, and the two ends inside the pipe sleeve 12 are respectively provided with sealing rings 121, and the sealing rings 121 are one-to-one corresponding and embedded in the sealing ring grooves. The above structure realizes the clamping cooperation of the end cover 11 and the pipe sleeve 12, and improves the sealing performance of the connection position of the end cover 11 and the pipe sleeve 12.

[0060] In other embodiments, the pipe sleeve 12 and the two end covers 11 can also be fixedly connected by adhesion or vulcanization, so that the pipe sleeve 12 and the two end covers 11 form an integral whole.

[0061] Continuing to refer to Figure 4 and Figure 5 , in one embodiment, the inner circumferential surface of the pipe sleeve 12 is convex to form two limiting rings 122 arranged at intervals, and the insulating ceramic 3 is clamped between the two limiting rings 122. The above structure can limit the position of the insulating ceramic 3, so as to avoid the displacement of the insulating ceramic 3 relative to the pipe sleeve 12.

[0062] In other embodiments, the pipe sleeve 12 and the insulating ceramic 3 can also be fixed by vulcanization or adhesion, so that the pipe sleeve 12 and the insulating ceramic 3 form an integral whole.

[0063] Optionally, the end cover 11 is connected with the corresponding electric conductor 100 by means of insertion and / or screwing.

[0064] Alternatively, the end cover 11 is integrally formed with the corresponding electric conductor 100.

[0065] With reference to Figure 6 As an optional embodiment, the electric conductor 100 is provided with a connecting platform 101, and the connecting platform 101 and the end cover 11 are respectively provided with connecting holes, and a fastener 4 such as a screw or a positioning pin is sequentially inserted into the connecting holes of the connecting platform 101 and the end cover 11, so as to realize the connection between the end cover 11 and the electric conductor 100. A slot can also be arranged on the side of the connecting platform 101 close to the end cover 11, and the end of the end cover 11 away from the insulating ceramic 3 is inserted into the slot, and the end cover 11 abuts against the bottom surface of the slot. After the installation of the heat conduction assembly, the end cover 11 is in surface contact with the connecting platform 101, so as to improve the heat conduction efficiency between the end cover 11 and the connecting platform 101.

[0066] With reference to Figure 7 As another optional embodiment, the end cover 11 is integrally formed with the corresponding electric conductor 100. Specifically, the end cover 11 is made of a metal material same as that of the electric conductor 100, and the end cover 11 and the electric conductor 100 are integrally formed; and the two ends of the pipe sleeve 12 are detachably sleeved on the two end covers 11, so as to connect the heat conduction assembly between the two electric conductors 100.

[0067] In another aspect, the embodiment provides a low-voltage circuit breaker. With reference to Figure 8 The low-voltage circuit breaker comprises at least two electric conductors 100 for connecting an electric circuit and at least one heat conduction assembly according to any one of the above embodiments.

[0068] The heat conduction assembly is connected between at least two adjacent electric conductors 100 with a temperature difference exceeding a set value.

[0069] It should be noted that the number of electric conductors 100 is adjusted according to the model of the low-voltage circuit breaker, and is not limited herein.

[0070] In the low-voltage circuit breaker provided by the embodiment, the electric conductor 100 is specifically a busbar of the low-voltage circuit breaker. The busbar of the low-voltage circuit breaker can be an incoming busbar or an outgoing busbar, wherein the incoming busbar is used for connecting a power supply, and the outgoing busbar is used for connecting a load, and the low-voltage circuit breaker is connected into an electric circuit through the incoming busbar and the outgoing busbar.

[0071] Further, among the incoming bus bars and the outgoing bus bars, one is a moving contact bus bar and the other is a static contact bus bar. The moving contact bus bar and the static contact bus bar can be either incoming bus bars or outgoing bus bars, depending on the wiring mode. Figure 8 The conductive body 100 is specifically a moving contact bus bar, and in addition, the heat conduction assembly can also be arranged between static contact bus bars.

[0072] Referring to Figure 8 In the illustrated embodiment, the low-voltage circuit breaker includes three moving contact bus bars arranged side by side, and a set of heat conduction assemblies is arranged between any two adjacent moving contact bus bars. The heat conduction assemblies can quickly transfer the heat of the middle moving contact bus bar to the two side moving contact bus bars, so as to quickly dissipate the heat of the middle moving contact bus bar and improve the balance of the temperature rise of the moving contact bus bars.

[0073] Continuing to refer to Figure 8 The low-voltage circuit breaker further includes a housing 200, and a contact system, an arc-extinguishing chamber, and a trip device arranged in the housing 200. The contact system includes moving contacts, static contacts, a moving contact bus bar connected to the moving contacts, and a static contact bus bar connected to the static contacts, wherein the moving contact bus bar and the static contact bus bar are the conductive body 100. The heat conduction assembly is arranged in the housing 200, and the heat conduction assembly is connected between two adjacent moving contact bus bars and / or static contact bus bars with a temperature difference exceeding a set value. The structures of the contact system, the arc-extinguishing chamber, and the trip device are all prior art, and will not be described here.

[0074] As described above, the low-voltage circuit breaker provided by the embodiment can quickly transfer the heat of the moving contact bus bar with a higher temperature to the moving contact bus bar with a lower temperature through the heat conduction assembly, so as to quickly dissipate the heat of the moving contact bus bar with a higher temperature and improve the balance of the temperature rise of the moving contact bus bars, thereby alleviating the problem of unbalanced current of the low-voltage circuit breaker and improving the use performance and service life of the low-voltage circuit breaker. In addition, the heat conduction assembly provided by the present application has the advantages of small size, easy installation, and simple structure. It is arranged in the gap between two adjacent conductive bodies 100, and does not need to additionally provide installation space for the heat conduction assembly, so as not to affect the overall size of the low-voltage circuit breaker.

[0075] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A thermally conductive assembly, characterized by, The application relates to a heat-conducting assembly, which comprises an electrically insulating shell (1) and a liquid metal (2) and an insulating ceramic (3) arranged in the electrically insulating shell (1), wherein: The electrically insulating shell (1) is used for insulating connection between two conductive bodies (100); The insulating ceramic (3) is arranged in the middle of the electrically insulating shell (1), and the liquid metal (2) is filled in the gap between the two ends of the electrically insulating shell (1) and the insulating ceramic (3).

2. The thermally conductive assembly of claim 1, wherein, The electrically insulating shell (1) comprises two end covers (11) and a sleeve (12) connected between the two end covers (11), the two end covers (11) and the sleeve (12) form a sealed cavity, and the liquid metal (2) and the insulating ceramic (3) are arranged in the sealed cavity; The two end covers (11) are respectively connected to the two conductive bodies (100); The sleeve (12) is made of insulating material.

3. The thermally conductive assembly of claim 2, wherein, The sleeve (12) is made of rubber or heat-conducting silica gel.

4. The thermally conductive assembly of claim 2, wherein, The length of the insulating ceramic (3) is greater than the total length of the liquid metal (2).

5. The thermally-conductive assembly of claim 2, wherein, One end of the end cover (11) close to the sleeve (12) is provided with a connecting boss (112), the connecting boss (112) is inserted into the sleeve (12), the outer circumferential surface of the connecting boss (112) is in close contact with the inner circumferential surface of the sleeve (12), and the stepped surface of the end cover (11) connected to the connecting boss (112) is in close contact with the end surface of the sleeve (12).

6. The thermally-conductive assembly of claim 2, wherein, The end cover (11) is provided with a liquid injection hole (111), and the liquid injection hole (111) is provided with a plug.

7. The thermally-conductive assembly of claim 2, wherein, The end cover (11) is made of one of metal, insulating ceramic, heat-conducting plastic, silica gel and rubber.

8. The thermally conductive assembly of claim 7, wherein, The end cover (11) is made of metal.

9. The thermally-conductive assembly of claim 2, wherein, The inner circumferential surface of the sleeve (12) is provided with two limiting rings (122) arranged at intervals, and the insulating ceramic (3) is clamped between the two limiting rings (122).

10. A low voltage circuit breaker characterized by, The application further relates to a circuit, which comprises at least two conductive bodies (100) and at least one heat-conducting assembly as claimed in any one of claims 1 to 9; The heat-conducting assembly is connected between at least two adjacent conductive bodies (100) with a temperature difference exceeding a set value.

Images