An electromagnetic trip unit

Abstract

The application discloses a high-sensitivity, high-reliability, long-service-life and low-power-consumption electromagnetic release. The technical scheme comprises a coil assembly mainly composed of a coil framework and winding lead terminals arranged on the coil framework; a yoke assembly vertically arranged on one side of the coil framework, which is composed of a first yoke and a second yoke, and the first yoke and the second yoke are welded together, and a magnet mounting opening is formed between the tail portions of the first yoke and the second yoke; a main pole shoe surface is arranged on the first yoke and extends from the upper end of the winding column of the coil framework; a secondary pole shoe surface is arranged on the second yoke and extends from the upper end of the coil framework and corresponds to one side of the main pole shoe surface; and an armature is movably arranged on the upper end of the coil framework and is in contact with the main pole shoe surface and the secondary pole shoe surface, so that a closed magnetic circuit is formed.

Description

TECHNICAL FIELD

[0001] The present application relates to an electromagnetic release. BACKGROUND

[0002] At present, the existing electromagnetic release structure, such as the Chinese invention patent with the publication number "CN113257642A" and the name "electromagnetic release" or the publication number "CN113223904A" and the name "electromagnetic release and electrical protection equipment comprising the same", is mainly composed of a U-shaped yoke and an armature, a tension spring, a coil, a push rod, a magnetic steel, and a shell. When the residual leakage current reaches a certain value level, the locking mechanism is tripped. However, due to the structure limitation, the tripping sensitivity is low, the reliability is low, and the service life is short, which causes the problems of tripping insensitivity, instability, and short service life of the leakage circuit breaker, and easily causes electric shock and premature failure of the leakage circuit breaker. In addition, the existing electromagnetic release structure is complex, large in size, high in power consumption, and poor in stability. SUMMARY

[0003] The technical problem to be solved by the present application is to provide an electromagnetic release with high sensitivity, high reliability, long service life, and low power consumption.

[0004] To solve the above problems, the technical solution adopted by the present application comprises:

[0005] A coil assembly mainly composed of a coil former and winding lead terminals arranged on the coil former;

[0006] A yoke assembly vertically arranged on one side of the coil former, which is composed of a first yoke and a second yoke, and the tail portions of the first yoke and the second yoke are welded together to form a magnet mounting opening, the first yoke is provided with a main pole shoe surface extending from the upper end of the coil former, and the second yoke is provided with a secondary pole shoe surface extending from the upper end of the coil former corresponding to one side of the main pole shoe surface;

[0007] An armature movably arranged on the upper end of the coil former and in contact with the main pole shoe surface and the secondary pole shoe surface to form a closed magnetic circuit;

[0008] A magnet installed in the magnet mounting opening of the yoke assembly to provide magnetic force for keeping the armature in close contact with the main pole shoe surface and the secondary pole shoe surface;

[0009] An elastic body connected to the armature to provide elastic force for the armature to separate from the main pole shoe surface and the secondary pole shoe surface.

[0010] The electromagnetic release is characterized in that the tail portions of the first yoke and the second yoke are bent to form the magnet mounting opening, and the magnet mounting opening is in the shape of a "V", and the magnet is adapted to the "V" shape.

[0011] The electromagnetic release is characterized in that the upper end of the coil former is provided with an armature mounting groove, the mouth of the armature mounting groove is provided with a supporting protrusion, and the armature is mounted in the armature mounting groove and the rear end is arranged on the supporting protrusion.

[0012] The electromagnetic release is characterized in that the elastic body is a double torsion spring and is mounted on the mounting shafts on the two sides of the upper end of the coil former, and the middle force arm presses the end of the armature.

[0013] The electromagnetic release is characterized in that the bottom of the first yoke and the second yoke is provided with a positioning mouth.

[0014] The electromagnetic release is characterized in that the bottom of the coil former is provided with a yoke mounting groove, and the first yoke and the second yoke are mounted in the yoke mounting groove.

[0015] The electromagnetic release is characterized in that it further comprises a shell composed of a lower shell and an upper shell, the coil assembly, the yoke assembly, the armature, the magnet and the elastic body are accommodated in the inner cavity of the lower shell, and the upper shell is provided with a movable push rod.

[0016] The electromagnetic release is characterized in that the lower shell is provided with a first positioning groove for positioning the magnet mounting opening of the first yoke and the second yoke.

[0017] The electromagnetic release is characterized in that the two sides of the lower shell are provided with positioning columns matched with the second positioning grooves on the two sides of the coil former, and the bottom of the lower shell is provided with a positioning flange for positioning the positioning mouth of the bottom of the first yoke and the second yoke.

[0018] The electromagnetic release is characterized in that the lower shell is hung with the coil former through the hooks on the two sides and the hanging grooves on the two sides of the coil former.

[0019] The electromagnetic release has the following advantages:

[0020] 1. The structure is simple and compact, the path of the magnetic closed magnetic circuit is short, the magnetic performance loss of the magnetic closed magnetic circuit is reduced, the magnetic performance of the magnetic closed magnetic circuit is enhanced, and the sensitivity and reliability of the electromagnetic release are improved.

[0021] 2. The yoke assembly is composed of two yokes which are combined and welded by laser beam melting welding process. The yoke of this structure can further reduce the magnetic performance loss of the magnetic closed magnetic circuit, enhance the magnetic performance of the magnetic closed magnetic circuit, and further improve the sensitivity and reliability of the electromagnetic release.

[0022] 3. The V-shaped magnet mounting opening is arranged at the tail of the yoke assembly, which can be closely combined with the trapezoidal cross-section magnet. The structure further reduces the magnetic performance loss of the magnetic closed magnetic circuit and enhances the magnetic performance of the magnetic closed magnetic circuit, thereby further improving the sensitivity and reliability of the electromagnetic release;

[0023] 4. The yoke assembly has a front main pole shoe surface and a rear secondary pole shoe surface to form a double pole shoe surface structure, which increases the pole shoe area of the magnetic closed magnetic circuit. The yoke of the structure can further reduce the magnetic performance loss of the magnetic closed magnetic circuit and enhance the magnetic performance of the magnetic closed magnetic circuit, thereby further improving the sensitivity and reliability of the electromagnetic release;

[0024] 5. The combination of the armature, the torsion spring and the supporting protrusion forms a suspended armature structure. The armature has small friction and large torsion. When the magnetic closed magnetic circuit is opened, the armature has high sensitivity, high reliability and large thrust to push the push rod.

[0025] 6. The coil assembly is arranged vertically, which increases the magnetic performance of the electromagnetic system and reduces the power consumption of the electromagnetic system, thereby further improving the sensitivity and reliability of the electromagnetic release. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a sectional view of the electromagnetic release of the present application;

[0027] Figure 2 is an exploded view of the electromagnetic release of the present application;

[0028] Figure 3 is an assembly diagram of the coil assembly, the yoke assembly, the armature, the magnet and the elastic body of the present application;

[0029] Figure 4 is a structural diagram of the coil skeleton of the present application;

[0030] Figure 5 is a structural diagram of the yoke assembly of the present application;

[0031] Figure 6 is a structural diagram of the double torsion spring of the present application;

[0032] Figure 7 is a structural diagram of the lower shell of the present application;

[0033] Figure 8 is a structural diagram of the armature of the present application. DETAILED DESCRIPTION

[0034] Referring to Figures 1-8As shown, the electromagnetic release of the present application comprises: a coil assembly 1, a yoke assembly 2, an armature 3, a magnet 4 and an elastic body 5. The coil assembly 1 mainly consists of a coil former 6 and winding lead terminals 7 arranged on the coil former 6. A wire is wound on the winding column 11 of the coil former 6, and the outgoing end of the wire is welded with the winding lead terminals 7. The yoke assembly 2 is vertically arranged on one side of the coil former 6. The yoke assembly 2 is formed by laminating the first yoke 8 and the second yoke 9, and then welded by laser beam melting welding process. The tail portions of the first yoke 8 and the second yoke 9 form a magnet mounting opening 10. The magnet mounting opening 10 is in the shape of "V" formed by outwardly bending the tail portions of the first yoke 8 and the second yoke 9. The magnet 4 is fixed in the magnet mounting opening 10, and provides magnetic force for keeping the armature 3 in contact with the main pole shoe surface 12 and the auxiliary pole shoe surface 13. The magnet 4 is preferably a permanent magnet, and has a trapezoidal structure matching the "V" shape structure. The magnet 4 is tightly contacted with the magnet mounting opening 10, and then welded and fixed. The first yoke 8 is provided with the main pole shoe surface 12 extending from the upper end of the winding column 11 of the coil former 6. The second yoke 9 is provided with the auxiliary pole shoe surface 13 extending from one side of the upper end of the coil former 6. The armature 3 is in the shape of a flat strip, and is movably arranged on the upper end of the coil former 6. The armature 3 is in contact with the main pole shoe surface 12 and the auxiliary pole shoe surface 13, forming a closed magnetic circuit. The elastic body 5 is connected with the armature 3, and provides elastic force for the armature 3 to separate from the main pole shoe surface 12 and the auxiliary pole shoe surface 13. After adopting the above structure, when the residual current value of the winding lead terminal reaches a certain value, the magnetic moment generated by the coil is greater than the magnetic moment of the magnetic closed circuit formed by the magnet, the yoke assembly, the armature and the elastic body. The magnetic closed circuit is opened, the armature pushes the push rod upward, the push rod drives the circuit breaker locking mechanism to trip, and the purpose of tripping the whole leakage circuit breaker is achieved.

[0035] Preferably, the upper end of the coil former 6 is provided with an armature mounting groove 14. The mouth of the armature mounting groove 14 is provided with a support protrusion 15. The armature 3 is mounted in the armature mounting groove 14, and the rear end is arranged on the support protrusion 15. The support protrusion 15 is preferably made of magnetic conductive material (same as the yoke material), and is welded and fixed with the first yoke 8 and the second yoke 9. The support protrusion 15 can also be an extension of the upper end of the first yoke 8 and the second yoke 9.

[0036] Preferably, the elastic body 5 is a double torsion spring, and is mounted on the mounting shaft 16 on both sides of the upper end of the coil frame 6, with the middle force arm 17 pressing against the end of the armature 3. In order to improve the stability of the elastic body 5, the middle force arm 17 is arranged in the torsion spring positioning groove 31 at the end of the armature 3. The elastic body 5 adopts a double torsion spring and is mounted on the mounting shaft at the upper end of the coil frame, which has the advantages of stable structure and no space occupation, and makes the product more compact.

[0037] Preferably, the bottom of the first yoke 8 and the second yoke 9 is provided with a positioning port 18. Through the positioning port 18 and the mounting body, the first yoke 8 and the second yoke 9 are positioned and matched, so that the structure of the first yoke 8 and the second yoke 9 is more stable after installation.

[0038] Preferably, the bottom of the coil frame 6 is provided with a yoke mounting groove 19, and the bottom front end of the first yoke 8 and the second yoke 9 is mounted in the yoke mounting groove 19. The coil frame 6 is assembled with the first yoke 8 and the second yoke 9 through the yoke mounting groove 19, so that the structure of the first yoke 8 and the second yoke 9 is more stable and compact after installation.

[0039] Preferably, it further includes a shell 20, which is composed of a lower shell 21 and an upper shell 22, and the coil assembly 1, the yoke assembly 2, the armature 3, the magnet 4 and the elastic body 5 are contained in the inner cavity of the lower shell 21, and the upper shell 22 is provided with a movable push rod 23. After the shell 20 is assembled, the electromagnetic release forms a separate product, which can be applied to mechanisms such as residual current leakage circuit breaker, residual current leakage socket, residual current leakage protection switch, residual current leakage protection device, residual current leakage protection mechanism, etc. When the shell is not needed, the coil assembly 1, the yoke assembly 2, the armature 3, the magnet 4 and the elastic body 5 can be directly contained in the shell of the application object.

[0040] Preferably, the lower shell 21 is provided with a first positioning groove 24 for positioning the magnet mounting opening 10 of the first yoke 8 and the second yoke 9. The two sides of the lower shell 21 are provided with positioning columns 26 which are positioned and matched with the second positioning grooves 25 on both sides of the coil frame 6, and the bottom of the lower shell 21 is provided with a positioning flange 30 for positioning the positioning port 18 at the bottom of the first yoke 8 and the second yoke 9. In order to ensure that the first yoke 8, the second yoke 9 and the coil frame 6 remain stable in the lower shell 21, thereby further improving the stability of the product.

[0041] Preferably, the lower shell 21 is hung with the hooks 27 on both sides with the hanging grooves 28 on both sides of the coil framework 6, so as to fix the coil framework 6 in the lower shell 21. In order to further improve the stability of the coil framework 6 after installation, the upper shell 22 is provided with a fixing part 32 abutting against the coil framework 6 after the upper shell 22 is butted against the lower shell 21.

[0042] The above is not any form of limitation on the present application, although the present application has been disclosed as above with the preferred embodiments, however, not in order to limit the present application, any person skilled in the art, without departing from the technical solution range of the present application, can make some changes or modifications for equivalent embodiments with the above disclosed structure and technical content, but any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present application, which does not depart from the technical solution of the present application, still belongs to the technical solution range of the present application.

Claims

1. An electromagnetic trip unit, characterized in that, include: The coil assembly (1) mainly consists of a coil frame (6) and winding lead terminals (7) provided on the coil frame (6); The yoke assembly (2) is disposed on one side of the coil frame (6). It is formed by stacking and welding the sheet-like first yoke (8) and second yoke (9) together, and a magnet mounting opening (10) is formed between the tail ends. The first yoke (8) is provided with a main pole shoe surface (12) extending from the upper end of the winding post (11) of the coil frame (6), and the second yoke (9) is provided with a secondary pole shoe surface (13) extending from the upper end of the coil frame (6) on the side corresponding to the main pole shoe surface (12). The armature (3) is movably disposed on the upper end of the coil frame (6) and contacts the main pole shoe surface (12) and the secondary pole shoe surface (13) to form a closed magnetic circuit; A magnet (4) is installed in the magnet mounting opening (10) of the yoke assembly (2) to provide magnetic force for the armature (3) to maintain a close fit with the main pole shoe surface (12) and the secondary pole shoe surface (13); The elastomer (5) is connected to the armature (3) and provides elastic force for the armature (3) to disengage from the main pole shoe surface (12) and the secondary pole shoe surface (13).

2. The electromagnetic trip unit according to claim 1, characterized in that: The magnet mounting opening (10) is formed by bending the tails of the first yoke (8) and the second yoke (9), and the magnet mounting opening (10) is in the shape of a "V". The magnet (4) is adapted to the "V" shape.

3. The electromagnetic trip unit according to claim 1, characterized in that: The upper end of the coil frame (6) is provided with an armature mounting groove (14), and the opening of the armature mounting groove (14) is provided with a support protrusion (15). The armature (3) is installed in the armature mounting groove (14) and its rear end is mounted on the support protrusion (15).

4. The electromagnetic trip unit according to claim 1, characterized in that: The elastic body (5) is a double torsion spring and is mounted on the mounting shaft (16) on both sides of the upper end of the coil frame (6), with the middle lever arm (17) pressing against the end of the armature (3).

5. The electromagnetic trip unit according to claim 1, characterized in that: The bottom of the first yoke (8) and the second yoke (9) are provided with positioning holes (18).

6. The electromagnetic trip unit according to claim 1, characterized in that: The bottom of the coil frame (6) is provided with a yoke mounting groove (19), and the bottom front ends of the first yoke (8) and the second yoke (9) are installed in the yoke mounting groove (19).

7. The electromagnetic trip unit according to any one of claims 1 or 6, characterized in that: It also includes a housing (20), which is composed of a lower housing (21) and an upper housing (22) that are mated together. The coil assembly (1), the yoke assembly (2), the armature (3), the magnet (4) and the elastic body (5) are housed in the inner cavity of the lower housing (21), and the upper housing (22) is provided with a movable push rod (23).

8. The electromagnetic trip unit according to claim 7, characterized in that: The lower housing (21) is provided with a first positioning groove (24) for positioning the magnet mounting opening (10) of the first yoke (8) and the second yoke (9).

9. The electromagnetic trip unit according to claim 7, characterized in that: The lower housing (21) has positioning posts (26) on both sides that are positioned and engaged with the second positioning grooves (25) on both sides of the coil frame (6). The bottom of the lower housing (21) has a positioning flange (30) for positioning the positioning ports (18) at the bottom of the first yoke (8) and the second yoke (9).

10. The electromagnetic trip unit according to claim 7, characterized in that: The lower housing (21) is connected to the hanging slots (28) on both sides of the coil frame (6) via hooks (27) on both sides.

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