Electric leakage module and miniature electric leakage circuit breaker

Abstract

The utility model discloses an electric leakage module and a small-sized electric leakage circuit breaker, a first peripheral side wall is provided with a through hole, a test button and a first half shell are arranged in a sliding manner, and a part of the test button is exposed through the through hole; in the width direction, a first bearing protrusion is integrally formed on the first inner side wall in an injection molding mode, a bearing rod is inserted in the first bearing protrusion, the bearing rod is a metal piece, and the strength of the bearing rod is larger than that of the first bearing protrusion. In the height direction, the bearing rod is partially located under the test button, and the two ends of the reset compression spring abut against the portion between the test button and the bearing rod. In the width direction, the distance D of the bearing rod inserted into the first bearing protrusion is larger than the minimum distance d between the bearing rod and the second half shell. The steel plate has the advantage of being good in strength.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of circuit breakers, and is a leakage module and a small leakage circuit breaker. BACKGROUND

[0002] The leakage module cannot be separated from the leakage test function. The existing leakage test function relies on the test button pressing to enable the test circuit to realize it. After pressing, the test button can return to the initial position under the action of the self-resetting spring.

[0003] The existing test button and its reset spring installation structure is as follows: a leakage module and a test button of a leakage module disclosed in CN204130478U, a recess is arranged on the shell, one end of the reset spring abuts against the test button, and the other end abuts against the recess. Here, the recess is actually a protrusion (integrally injection molded, all plastic materials) of the first inner side wall of the module shell. In order to ensure that it can abut against the reset spring, it needs to protrude from the first inner side wall by a relatively large distance.

[0004] For plastic products, the farther the isolated protrusion is from the reference surface it is connected to, the lower its strength will be. That is, the protrusion of the first inner side wall in the above patent will actually reduce the strength of the protrusion as it is farther from the first inner side wall of the module shell. In order to reduce the attenuation of such strength, the protrusion of the patent is connected to different side walls of the module shell through multiple dimensionally extended walls, thereby increasing the strength.

[0005] However, by this way of increasing strength, the wall of the protrusion that actually works on the test button is only the horizontal wall (the part abutting against the reset spring), and the rest of the walls are redundant, additionally occupying a lot of space, so that this part of space cannot be fully utilized.

[0006] Therefore, it is necessary to redesign the structure of the test button to solve the above problems. SUMMARY

[0007] Therefore, the present application aims to overcome the deficiencies in the prior art and provides a leakage module and a small leakage circuit breaker.

[0008] The application provides a leakage module, which comprises a module shell, a test button and a reset compression spring; the module shell comprises a first half shell and a second half shell which are spliced with each other, and the second half shell is located on one side of the first half shell in the width direction; the first half shell comprises a first inner side wall and a first peripheral side wall; the first peripheral side wall surrounds and is connected to the periphery of the first inner side wall in the width direction; a through hole is formed in the first peripheral side wall; the test button is slidably arranged on the first half shell, and part of the test button is exposed from the through hole; a first bearing protrusion is integrally injection molded on the first inner side wall in the width direction; a bearing rod is inserted into the first bearing protrusion; the bearing rod is a metal part and has a strength greater than that of the first bearing protrusion; in the height direction, the bearing rod is partially located directly below the test button, and the two ends of the reset compression spring abut against the test button and the bearing rod respectively; in the width direction, the distance D between the bearing rod and the first bearing protrusion is greater than the distance d between the bearing rod and the second half shell.

[0009] In some embodiments of the application, the distance from the end face of the first bearing protrusion away from the first inner side wall to the first inner side wall is e1, the distance from the end of the bearing rod where the reset compression spring abuts to the first inner side wall is E1, and E1>e1.

[0010] In some embodiments of the application, the second half shell comprises a second inner side wall, and the second inner side wall protrudes a second bearing protrusion; in the height direction, the second bearing protrusion is below the bearing rod and abuts to the end of the bearing rod adjacent to the second half shell.

[0011] In some embodiments of the application, the distance from the end face of the second bearing protrusion away from the second inner side wall to the second inner side wall is e2, the distance from the end of the bearing rod where the reset compression spring abuts to the first inner side wall is E2, and E2>e2.

[0012] In some embodiments of the application, the bearing rod comprises two insertion sections, two bending sections and an abutting section; the abutting section is connected to the insertion sections through the two bending sections; the abutting section is used for abutting to the reset compression spring, and the insertion sections are used for being inserted into the first bearing protrusion; the distance between the two insertion sections is greater than the size of the abutting section.

[0013] In some embodiments of the application, the abutting section is in the shape of U.

[0014] In some embodiments of the application, the first bearing protrusion has two protruding parts away from one end of the first inner side wall, an avoiding gap is formed between the two protruding parts, and the two insertion sections are inserted into the two protruding parts respectively; the test button comprises a button main body and a baffle; a containing groove is formed in the button main body, one end of the reset compression spring is located in the containing groove and abuts to the test button; the baffle is connected to the button main body and is located on one side of the reset compression spring, and the baffle is always partially located in the avoiding gap.

[0015] In some embodiments of the present application, the second half shell comprises a second inner side wall; the second inner side wall protrudes two limiting protrusions, which are arranged on both sides of the abutting section in the length direction to limit at least part of the return compression spring.

[0016] In some embodiments of the present application, the module shell is provided with a circuit board assembly, a first conductive column, a second conductive column and a test torsion spring; the circuit board assembly has a test circuit, and the first conductive column, the second conductive column and the test torsion spring constitute a mechanical switch in the test circuit; one end of the test torsion spring is always electrically connected with the first conductive column, and the other end is located below the test button and is always open with the second conductive column; when the test button is pressed, the other end of the test torsion spring is driven to contact the second conductive column, so that the test circuit is connected.

[0017] A small leakage circuit breaker comprises a circuit breaker module; further comprising a leakage module assembled on one side of the circuit breaker module.

[0018] The beneficial effects of the present application compared with the prior art are:

[0019] Compared with the prior art, the bearing rod in the present application is superior to the prior art (overlong protrusion) in material strength, the first bearing protrusion only needs to consider the insertion of the bearing rod, and does not need to add many unnecessary ribs to increase the strength as in the prior art. At the same time, since the first bearing protrusion does not need to directly bear the abutting effect with the return compression spring, it only needs to slightly protrude from the first inner side wall of the first shell when injection molding, so that the structural strength of the injection molding is also guaranteed (because the closer the distance from the first inner side wall, the higher the strength). BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0021] Figure 1 A perspective view of a small leakage circuit breaker according to an embodiment of the present application is shown;

[0022] Figure 2 An internal schematic diagram of a leakage module according to an embodiment of the present application is shown;

[0023] Figure 3 A schematic diagram of a first half shell according to an embodiment of the present application is shown;

[0024] Figure 4A sectional view of the second half shell in the embodiment of the application is shown;

[0025] Figure 5 A schematic view of the bearing rod in the embodiment of the application is shown;

[0026] Figure 6 A perspective view of the test button in the embodiment of the application is shown;

[0027] Figure 7 A sectional view and a partial enlarged view of the abutting position between the bearing rod and the reset compression spring in the embodiment of the application are shown;

[0028] Figure 8 A schematic view of the test button, the test torsional spring, the first conductive column and the second conductive column in the embodiment of the application is shown. DETAILED DESCRIPTION

[0029] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary only, for the purpose of explaining the present application, and should not be understood as a limitation of the present application.

[0030] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0031] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0032] In the present application, unless specifically defined otherwise or the context clearly dictates otherwise, the terms "mounting", "connected", "connection", "fixed", and like terms are to be construed in a broad sense and may be either fixed connections or detachable connections, or integral; may be mechanical connections or electrical connections; may be direct connections, or indirect connections via an intermediate medium; or may be a communication within two elements or an interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0033] In the present application, unless specifically defined otherwise or the context clearly dictates otherwise, a first feature "on" or "under" a second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact via an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature. Embodiment

[0034] As shown in the drawings, a small leakage circuit breaker has a circuit breaker module 100 and a leakage module 200. Figures 1-8

[0035] Here, the circuit breaker module 100 has moving and stationary contacts, operating mechanisms, arc extinguishing chambers, thermal release, magnetic release and other components inside. The circuit breaker module 100, also known as an air switch, can undertake overload, short circuit and other protection functions for the line. In the present application, the circuit breaker module 100 is a two-pole structure, that is, there are two main line conductors (terminal, moving and stationary contacts, and internal conductive row). Here, the circuit breaker module 100 itself belongs to the prior art and is irrelevant to the invention point of the present application, and its structure will not be described in detail.

[0036] The leakage module 200 is assembled on one side of the circuit breaker module 100, and the assembly here can be fastened with rivets. Alternatively, it can be fixed by clamping between the housings. Regardless of which way, it belongs to the conventional means in the art, which will not be described in detail here.

[0037] The leakage module 200 includes a module housing 210, which has a leakage mechanism 220, a zero sequence transformer 230, a test button 240, a test torsional spring 250, a first conductive column 260, a second conductive column 270, and a circuit board assembly 280 inside.

[0038] Here, the circuit board assembly 280 contains a leakage protection circuit and a test loop. ​

[0039] The leakage mechanism 220 includes a leakage release, a reset member, a reset member spring, and a release lever. The leakage release is an actuator of the leakage protection circuit, and the zero sequence transformer 230 is a sampling element of the leakage protection circuit. The zero sequence transformer 230 is arranged in the circuit breaker module 100 for all the main line conductors to pass through.

[0040] When no leakage occurs, the release lever is overlapped with the reset member, and the reset member does not protrude out of the module shell 210. When leakage occurs in the main line, the leakage protection circuit controls the leakage release to work, the leakage release pushes the release lever to rotate to cause the circuit breaker module 100 to trip, and the reset member is separated from the overlap with the release lever and protrudes out of the module shell 210. Here, the circuit structure of the leakage protection circuit and the leakage release principle are not the points of the present application, and are conventional means in the art, which will not be described here.

[0041] Here, the test torsional spring 250, the first conductive column 260, and the second conductive column 270 form a mechanical switch of the test loop. Specifically, one end of the test torsional spring 250 is always electrically connected with the first conductive column 260 (the two are always in contact), and the other end of the test torsional spring 250 is always open to the second conductive column 270. When the test button 240 is not pressed, the mechanical switch is in an open state (that is, the other end of the test torsional spring 250 is always open to the second conductive column 270). The other end of the test torsional spring 250 extends directly below the test button 240. When the test button 240 is pressed, the test button 240 pushes the other end of the test torsional spring 250 to contact the second conductive column 270, and the test loop is connected at this time. Here, the circuit structure of the test loop belongs to the conventional means in the art, which will not be described here.

[0042] The module shell 210 includes a first half shell 210a and a second half shell 210b. The first half shell 210a and the second half shell 210b are spliced together. The splicing is completed by rivets. Of course, in addition to this, screws or buckles can also be used for fastening.

[0043] In the width direction F2 (which can be said to be the width dimension of the three-dimensional space), the second half shell 210b is located on one side of the first half shell 210a.

[0044] The first half shell 210a includes a first inner side wall 210a1 and a first peripheral side wall, which surrounds and connects the periphery of the first inner side wall 210a1 in the width direction F2. Here, the first peripheral side wall is actually divided into a first top side wall 210a2, a first left side wall, a first right side wall, and a first bottom side wall according to its different orientations.

[0045] A through hole 210a3 is formed on the first top side wall 210a2, and the test button 240 is slidably arranged on the first half shell 210a and partially exposed outside the first half shell 210a by the through hole 210a3, so as to be driven by a user.

[0046] The first bearing protrusion 2101 is integrally injection molded on the first inner side wall 210a1, which is a first bearing protrusion 2101 protruding in the width direction F2.

[0047] The bearing rod 280 is inserted on the first bearing protrusion 2101, and the bearing rod 280 is a rod-shaped object made of metal, and its strength is greater than that of the first bearing protrusion 2101 (or the first half shell 210a, which is made of engineering plastic).

[0048] In the width direction F2, the distance D between the bearing rod 280 inserted into the first bearing protrusion 2101 is greater than the distance d between the bearing rod 280 and the second half shell 210b. In this way, by limiting the second half shell 210b, the bearing rod 280 can be blocked to prevent the bearing rod 280 from being separated from the first bearing protrusion 2101.

[0049] In the height direction F3, the bearing rod 280 is partially located directly below the test button 240, and the two ends of the reset compression spring 290 abut between the test button 240 and the bearing rod 280.

[0050] The user presses the test button 240 to complete the connection of the test circuit, and after the external force is removed, the reset compression spring 290 can drive the test button 240 to return to the original position.

[0051] Compared with the prior art, first, the material strength of the bearing rod 280 is better than that of the prior art structure. Second, the first bearing protrusion 2101 only needs to consider the insertion of the bearing rod 280, and does not need to add many unnecessary ribs to increase the strength as in the prior art, simplifying the structural complexity of the first bearing protrusion 2101 and saving a lot of space. Third, since the first bearing protrusion 2101 does not need to directly bear the abutting effect of the reset compression spring 290, it only needs to slightly protrude from the first inner side wall 210a1 of the first shell for the bearing rod 280 to be installed, so that the structural strength of the injection molding is also guaranteed (because the closer the distance from the first inner side wall 210a1, the higher the strength).

[0052] For the first bearing protrusion 2101, the distance from the end face of the first bearing protrusion 2101 away from the first inner side wall 210a1 to the first inner side wall 210a1 is e1, which can also be said to be the distance from the face for the bearing rod 280 to insert to the end face of the first inner side wall 210a1 is e1. The distance from the bearing rod 280 for the reset compression spring 290 abutting place to the first inner side wall 210a1 is E1, where E1>e1. Such a distance can ensure that the first bearing protrusion 2101 only needs to provide the bearing rod 280 for installation, and does not need to be directly for the reset compression spring 290 to abut as in the prior art.

[0053] Here, the second half shell 210b includes a second inner side wall 210b1 and a second peripheral side wall. In the width direction F2, the second peripheral side wall surrounds and is connected to the periphery of the second inner side wall 210b1. Here, the second peripheral side wall is actually divided into a second top side wall, a second left side wall, a second right side wall, and a second bottom side wall according to its different orientations.

[0054] Here, the second inner side wall 210b1 protrudes a second bearing protrusion 2102. Here, the second bearing protrusion 2102 is for the bearing rod 280 to abut, and is also protruding in the width direction F2. And in the height direction F3, the second bearing protrusion 2102 is below part of the bearing rod 280, and abuts the end of the bearing rod 280 adjacent to the second half shell 210b.

[0055] Such a second bearing protrusion 2102 can make the abutment of the bearing rod 280 more stable.

[0056] For the second bearing protrusion 2102, the distance from the end face of the second bearing protrusion 2102 away from the second inner side wall 210b1 to the second inner side wall 210b1 is e2, and the distance from the bearing rod 280 for the reset compression spring 290 abutting place to the first inner side wall 210a1 is E2, E2>e2.

[0057] Such a second bearing protrusion 2102 with a distance also only needs to slightly protrude the second inner side wall 210b1, to ensure that it can complete the abutment with the bearing rod 280, and does not need to be too long, which ensures the strength, and also does not need too complicated injection molding process.

[0058] For the carrier rod 280, it comprises two insertion sections 2801, two bending sections 2802 and an abutting section 2803. The insertion section 2801 is equivalent to the central part of the carrier rod 280, and the abutting section 2803 is connected to the insertion section 2801 through the two bending sections 2802. Here, the distance between the two insertion sections 2801 is greater than the size of the abutting section 2803. That is, the carrier rod 280 contains a wide part and a narrow part, the abutting section 2803 is equivalent to the narrow part (for the abutting of the reset compression spring 290), and the two insertion sections 2801 constitute the wide part (for assembly), and the bending sections 2802 complete the connection of the wide part and the narrow part.

[0059] Such a carrier rod 280 is very simple to install and easy to form.

[0060] Here, the abutting section 2803 is in the shape of a U. This allows the carrier rod 280 to be a symmetrical structure as a whole, which can simplify the assembly of workers and reduce the time for workers to identify the orientation of the carrier rod.

[0061] Here, the first carrier protrusion 2101 has two protrusions 21011 away from one end of the first inner side wall 210a1. The two protrusions 21011 are spaced apart, and form an avoidance gap S. The two protrusions 21011 here have insertion holes 21012, and the two insertion sections 2801 are inserted into the two insertion holes 21012 respectively to form insertion.

[0062] The test button 240 comprises a button body 240a and a baffle 240b. The button body 240a is provided with a receiving groove 240c, and one end of the reset compression spring 290 is located in the receiving groove 240c to abut against the test button 240. One end of the baffle 240b is connected to the button body 240a and located on one side of the reset compression spring 290, and the baffle 240b is always partially located in the avoidance gap S.

[0063] The arrangement of the baffle 240b and the avoidance gap S can not only limit the position of the reset compression spring 290, but also ensure the normal pressing of the test button 240.

[0064] In order to further ensure the limiting of the reset compression spring 290, two limiting protrusions 2103 are protruded on the second inner side wall 210b1. In the length direction F1, the two limiting protrusions 2103 are spaced apart and arranged on both sides of the abutting section 2803, that is, on both sides of the reset compression spring 290, so as to limit the reset compression spring 290. The reset compression spring 290 is ensured.

[0065] By limiting the reset compression spring 290 in the above-mentioned directions, the position of the reset compression spring 290 is relatively stable even if the reset compression spring 290 is in a deformed state (when the test button 240 is pressed), and the reset compression spring 290 will not be misaligned.

[0066] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Also, the specific feature, structure, material or characteristic described can be combined in an appropriate manner in any one or more embodiments or examples. Furthermore, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples, without contradiction.

[0067] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and the person skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A leakage current module, comprising a module housing, a test button, and a reset spring; characterized in that: The module housing includes a first half-shell and a second half-shell that are spliced ​​together, with the second half-shell located on one side of the first half-shell in the width direction; the first half-shell includes a first inner sidewall and a first peripheral sidewall; in the width direction, the first peripheral sidewall surrounds and connects to the periphery of the first inner sidewall. A through hole is provided on the first side wall, and the test button is slidably set with the first half shell, with part of the test button exposed through the through hole; In the width direction, a first bearing protrusion is integrally injection molded on the first inner sidewall, and a bearing rod is inserted into the first bearing protrusion. The bearing rod is a metal part and its strength is greater than that of the first bearing protrusion. In the height direction, the bearing rod is located directly below the test button, and the two ends of the reset spring abut against the test button and the bearing rod respectively. In the width direction, the distance D that the bearing rod is inserted into the first bearing protrusion is greater than the distance d between the bearing rod and the second half shell.

2. A leakage current module according to claim 1, characterized in that: The distance from the end face of the first bearing protrusion away from the first inner sidewall to the first inner sidewall is e1, and the distance from the point where the bearing rod is supplied with the reset spring to the first inner sidewall is E1, where E1>e1.

3. A leakage current module according to claim 1, characterized in that: The second half-shell includes a second inner sidewall, on which a second bearing protrusion protrudes; in the height direction, the second bearing protrusion is located below the bearing rod and abuts against one end of the bearing rod adjacent to the second half-shell.

4. A leakage current module according to claim 3, characterized in that: The distance from the end face of the second bearing protrusion away from the second inner sidewall to the second inner sidewall is e2, and the distance from the point where the bearing rod is supplied with the reset spring to the first inner sidewall is E2, where E2>e2.

5. A leakage current module according to claim 1, characterized in that: The bearing rod includes two insertion sections, two bending sections, and an abutment section. The abutment section is connected to the insertion sections through the two bending sections. The abutment section is used to abut against the reset spring, and the insertion section is used to insert into the first bearing protrusion. The distance between the two insertion sections is greater than the size of the abutment section.

6. A leakage current module according to claim 5, characterized in that: The connecting section is U-shaped.

7. A leakage current module according to claim 5, characterized in that: The first bearing protrusion has two protrusions at the end away from the first inner sidewall, and a clearance gap is formed between the two protrusions. The two insertion sections are respectively inserted into the two protrusions. The test button includes a button body and a baffle. A receiving groove is opened on the button body, and one end of the reset spring is located in the receiving groove to abut against the test button. The baffle is connected to the button body and is located on one side of the reset spring. The baffle is always partially in the clearance gap.

8. A leakage current module according to claim 5, characterized in that: The second half-shell includes a second inner sidewall; the second inner sidewall protrudes with two limiting protrusions, which are located on both sides of the abutment section in the length direction to limit at least part of the reset spring.

9. A leakage current module according to claim 1, characterized in that: The module housing contains a circuit board assembly, a first conductive post, a second conductive post, and a test torsion spring. The circuit board assembly has a test circuit, and the first conductive post, the second conductive post, and the test torsion spring constitute a mechanical switch in the test circuit. One end of the test torsion spring is always electrically connected to the first conductive post, and the other end is located below the test button and is normally open with respect to the second conductive post. When the test button is pressed, it drives the other end of the test torsion spring to contact the second conductive post, thereby connecting the test circuit.

10. A miniature residual current circuit breaker, comprising a circuit breaker module; characterized in that: It also includes a leakage current module as described in any one of claims 1-9, wherein the leakage current module is assembled on one side of the circuit breaker module.

Images