Auxiliary normally-closed contact structure and contactor thereof

Abstract

The auxiliary normally-closed contact structure comprises a ceramic cover, a pair of load leading-out ends and a pair of auxiliary normally-closed leading-out pins are arranged on the ceramic cover in a penetrating mode, a pushing assembly, a driving reed and an auxiliary normally-closed movable reed are arranged in an installation cavity, and the driving reed and the auxiliary normally-closed movable reed are installed on the pushing assembly. The auxiliary normally-closed movable reed comprises a connecting part and contact parts formed on the two sides of the connecting part, the inner wall of the upper portion of the ceramic cover extends downwards to be provided with a pair of stop baffles, the lower ends of the stop baffles are not lower than the lower end of the auxiliary normally-closed lead-out pin, and when the pushing assembly acts, the driving reed is driven to move upwards to make contact with the pair of load lead-out ends. And the contact part of the auxiliary normally-closed movable contact spring is upwards extruded by the stop baffle to deform and is in a downward inclined state, and the contact part of the auxiliary normally-closed movable contact spring is separated from the pair of auxiliary normally-closed lead-out needles. According to the scheme, a load two-end detection function is realized through a mechanical structure in which the stop baffle is matched with the auxiliary normally-closed movable contact spring, the structure is stable, the reliability is high, and the cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of contactors, in particular to an auxiliary normally closed contact structure and a contactor thereof. Background Art

[0002] There are two types of existing high-voltage DC contactors to achieve the auxiliary contact normally closed detection function:

[0003] One is to use a micro switch as the normally closed detection contact of the contactor. The cost is low, but it is easy to fail, which will face a great test for high-strength and high-performance products.

[0004] The other is to use a Hall sensor as the normally closed detection contact of the contactor. The cost is high, and the product usage conditions are limited. When the contactor is installed in a strong magnetic field area during use, the auxiliary normally closed detection function is extremely prone to error and failure. Summary of the Invention

[0005] In order to solve the above problems, the first object of the utility model is to provide an auxiliary normally closed contact structure, which realizes the detection function at both ends of the load through the mechanical structure of the stop baffle cooperating with the auxiliary normally closed moving reed, has a stable structure, high reliability, low cost, and can realize the monitoring of the conduction state of the main circuit of the contactor within a narrow space range; the second object of the utility model is to provide a contactor with the above-mentioned auxiliary normally closed contact structure.

[0006] In order to achieve the above object, the utility model adopts the following technical solutions:

[0007] An auxiliary normally closed contact structure includes a ceramic cover, an installation cavity is formed inside the ceramic cover, a pair of load lead-out ends and a pair of auxiliary normally closed lead-out pins are penetrated through the ceramic cover, a pushing component, a main reed and an auxiliary normally closed moving reed installed on the pushing component are arranged in the installation cavity; it is characterized in that:

[0008] The auxiliary normally closed moving reed is located above the main reed, and includes a connecting portion fixed to the pushing component and contact portions formed on both sides of the connecting portion. When the pushing component does not act, the contact portions of the auxiliary normally closed moving reed are in contact with a pair of auxiliary normally closed lead-out pins, and the main reed is separated from a pair of load lead-out ends;

[0009] A pair of stop baffles are downwardly extended from the upper inner wall of the ceramic cover, the pair of stop baffles are located between a pair of auxiliary normally closed lead-out pins, the lower end of the stop baffle is not lower than the lower end of the auxiliary normally closed lead-out pin. When the pushing component acts, it drives the main reed to move upward to contact a pair of load lead-out ends, the contact portions of the auxiliary normally closed moving reed are upwardly squeezed by the stop baffle to deform into a downward inclined state, and the contact portions of the auxiliary normally closed moving reed are separated from a pair of auxiliary normally closed lead-out pins.

[0010] Preferably, the stop baffle is arranged along the width direction of the auxiliary normally closed moving reed, and the width of the stop baffle is equal to the width of the contact part.

[0011] Preferably, the cross-section of the stop baffle facing the load lead-out end is triangular with a gradually decreasing width from top to bottom.

[0012] Preferably, the lower end of the stop baffle has a rounded transition.

[0013] Preferably, the lower end of the stop baffle corresponds to the middle part of the contact part.

[0014] Preferably, a raised section is formed on the contact part near the connecting part, and the raised section is inside the stop baffle.

[0015] A contactor includes an auxiliary normally closed contact structure according to any one of the above.

[0016] In the technical solution of the present utility model, the upper inner wall of the ceramic cover extends downward to form a stop baffle. The stop baffle is arranged between a pair of auxiliary normally closed lead-out pins and is close to the auxiliary normally closed lead-out pins. The stop baffle, the auxiliary normally closed lead-out pins and the auxiliary normally closed moving reed are arranged on the same plane. On the pushing assembly, the auxiliary normally closed moving reed is arranged above the active reed.

[0017] Therefore, when the auxiliary contact is in the normally closed state, the magnetic drive coil is not energized, the pushing assembly does not work, the auxiliary normally closed moving reed is in a horizontal state and contacts the auxiliary normally closed lead-out pin, the active reed is separated from the load lead-out end, and there is no extrusion relationship between the auxiliary normally closed moving reed and the stop baffle; after the magnetic drive coil is energized, the pushing assembly moves upward to drive the auxiliary normally closed moving reed and the active reed to move upward. The active reed contacts the load lead-out end, while both sides of the auxiliary normally closed moving reed are squeezed and tilted downward so that the auxiliary normally closed moving reed is separated from the auxiliary normally closed lead-out pin. After the magnetic drive coil is de-energized, both sides of the auxiliary normally closed moving reed will reset under the action of its own elastic force and contact the auxiliary normally closed lead-out pin.

[0018] The above solution has the following beneficial effects:

[0019] 1. The extrusion cooperation between the stop baffle and the auxiliary normally closed moving reed causes the auxiliary normally closed moving reed to deform, and the auxiliary normally closed moving reed resets under the action of its own elastic force. This mechanical structure is reliable, stable and not easily interfered and fails.

[0020] 2. Compared with using a micro switch and a Hall sensor as the auxiliary normally closed detection contact of the contactor, the cost is low.

[0021] 3. Without using a micro switch and a Hall sensor, the design of the auxiliary normally closed contact for monitoring the conduction state of the main circuit of the contactor can be completed within a narrow space range, and the contactor is more miniaturized.

[0022] 4. The stop baffle and the ceramic cover are integrally formed, with high structural strength and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic top view structure diagram of a contactor.

[0024] Figure 2 When the magnetic drive coil is not energized Figure 1 Schematic cross-sectional structure diagram taken along the A-A direction.

[0025] Figure 3 When the magnetic drive coil is not energized Figure 1 Schematic cross-sectional structure diagram taken along the B-B direction.

[0026] Figure 4 When the magnetic drive coil is energized Figure 1 Schematic cross-sectional structure diagram taken along the A-A direction.

[0027] Figure 5 When the magnetic drive coil is energized Figure 1 Schematic cross-sectional structure diagram taken along the B-B direction.

[0028] Figure 6 It is a schematic three-dimensional structure diagram of the ceramic cover.

[0029] Figure 7 It is a schematic bottom view structure diagram of the ceramic cover.

[0030] Figure 8 For Figure 7 Schematic cross-sectional structure diagram taken along the A-A direction.

[0031] Figure 9 It is a schematic diagram of the positions of the auxiliary normally closed moving reed and the main reed on the pushing assembly.

[0032] Figure 10 It is a schematic three-dimensional structure diagram of the auxiliary normally closed moving reed. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0034] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0035] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more, unless otherwise clearly defined.

[0036] In the present utility model, unless otherwise clearly specified and defined, terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0037] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "above", and "on the top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "below", and "under the bottom of" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature. Embodiment 1:

[0038] As Figures 2 to 10 shown, an auxiliary normally closed contact structure includes a ceramic cover 1. An installation cavity is formed inside the ceramic cover 1. A pair of load lead-out terminals 2 and a pair of auxiliary normally closed lead-out pins 3 are passed through the ceramic cover 1. A pushing assembly, an active reed 4 and an auxiliary normally closed moving reed 5 mounted on the pushing assembly are provided inside the installation cavity;

[0039] The auxiliary normally closed moving reed 5 is located above the active reed 4, and includes a connecting portion 6 fixed to the pushing assembly and contact portions 7 formed on both sides of the connecting portion 6. When the pushing assembly is not actuated, the contact portions 7 of the auxiliary normally closed moving reed 5 are in contact with a pair of auxiliary normally closed lead pins 3, and the active reed 4 is separated from a pair of load output terminals 2.

[0040] A pair of stop baffles 8 extend downward from the upper inner wall of the ceramic cover 1. The pair of stop baffles 8 are located between a pair of auxiliary normally closed lead pins 3, and the lower ends of the stop baffles 8 are not lower than the lower ends of the auxiliary normally closed lead pins 3. When the pushing assembly is actuated, it drives the active reed 4 to move upward and contact a pair of load output terminals 2. The contact portions 7 of the auxiliary normally closed moving reed 5 are upwardly squeezed by the stop baffles 8 and deformed into a downward inclined state, and the contact portions 7 of the auxiliary normally closed moving reed 5 are separated from a pair of auxiliary normally closed lead pins 3.

[0041] In the above technical solution, the upper inner wall of the ceramic cover extends downward to form a stop baffle. The stop baffle is arranged between a pair of auxiliary normally closed lead pins and close to the auxiliary normally closed lead pins. The stop baffle, the auxiliary normally closed lead pins and the auxiliary normally closed moving reed are arranged in the same plane. On the pushing assembly, the auxiliary normally closed moving reed is arranged above the active reed.

[0042] In the normally closed state of the auxiliary contact, the magnetic drive coil 103 is not energized, the pushing assembly 100 does not work, the auxiliary normally closed moving reed is in a horizontal state and in contact with the auxiliary normally closed lead pin, the active reed is separated from the load output terminal, and there is no squeezing relationship between the auxiliary normally closed moving reed and the stop baffle; after the magnetic drive coil 103 is energized, the moving iron core 102 pushes the pushing assembly 100 to move upward, driving the auxiliary normally closed moving reed and the active reed to move upward. The active reed contacts the load output terminal, while the two sides of the auxiliary normally closed moving reed are squeezed and inclined downward, so that the auxiliary normally closed moving reed is separated from the auxiliary normally closed lead pin. After the magnetic drive coil is de-energized, the two sides of the auxiliary normally closed moving reed will reset and contact the auxiliary normally closed lead pin under the action of its own elastic force.

[0043] The squeezing cooperation between the stop baffle and the auxiliary normally closed moving reed deforms the auxiliary normally closed moving reed, and the auxiliary normally closed moving reed resets under the action of its own elastic force. This mechanical structure is reliable, stable, not easily interfered and fails, and has a lower cost compared with using a micro switch and a Hall sensor as the auxiliary normally closed detection contact of the contactor.

[0044] It should be noted here that the lower end of the stop baffle 8 is not lower than the lower end of the auxiliary normally closed lead pin 3, that is, the longitudinal length of the stop baffle should be less than or equal to the longitudinal length of the auxiliary normally closed lead pin, so as to ensure that the auxiliary normally closed moving reed is in contact with the auxiliary normally closed lead pin when in the natural horizontal state.

[0045] Furthermore, the stop baffle 8 is arranged along the width direction of the auxiliary normally closed moving reed 5, and the width of the stop baffle 8 is equal to the width of the contact portion 7. In this technical solution, the width of the stop baffle is equal to the width of the contact portion of the auxiliary normally closed moving reed, which can increase the extrusion contact area between the stop baffle and the auxiliary normally closed moving reed in the width direction, making it easier for the auxiliary normally closed moving reed to deform.

[0046] Furthermore, the cross-section of the stop baffle 8 facing the load lead-out end 2 is triangular with a gradually decreasing width from top to bottom. In this technical solution, the width of the stop baffle gradually decreases from top to bottom, which can reduce the extrusion contact area between the stop baffle and the auxiliary normally closed moving reed in the length direction, prevent the auxiliary normally closed moving reed from abutting against the lower end face of the stop baffle after moving upward and being not easy to deform, and at the same time prevent the auxiliary normally closed moving reed from sticking to the inner side of the lower end of the stop baffle after extrusion, resulting in excessive deformation and the risk of breakage and elastic failure of the auxiliary normally closed moving reed.

[0047] Furthermore, the lower end of the stop baffle 8 has a rounded transition. In this technical solution, the rounded transition of the lower end of the stop baffle 8 can reduce the friction between the stop baffle and the auxiliary normally closed moving reed, better protect the auxiliary normally closed moving reed, and extend the service life of the product.

[0048] Furthermore, the lower end of the stop baffle 8 corresponds to the middle of the contact portion 7. In this technical solution, the horizontal distances from the extrusion position between the stop baffle and the contact portion to both ends of the contact portion are equal, preventing the extrusion position from being too close to the inside, resulting in the contact portion being not easy to deform and being too close to the fixed point and easy to break; preventing the extrusion position from being too close to the outside, resulting in excessive deformation of the contact portion and elastic failure.

[0049] Furthermore, a raised section 9 is formed on the contact portion 7 near the connecting portion 6, and the raised section 9 is inside the stop baffle 8. In this technical solution, the raised section can improve the structural strength of the contact portion, and at the same time, as Figure 5 shown, the deformation of the contact portion starts after the raised section, reducing the pressure at the connection between the connecting portion and the pushing assembly and improving the structural stability. Embodiment 2:

[0050] As Figures 1 to 5 shown, a contactor includes an auxiliary normally closed contact structure in Embodiment 1.

[0051] In this specific embodiment, aiming at the problems of easy failure and high cost existing in the conventional use of microswitches and Hall sensors as auxiliary normally closed contacts in existing contactors, the above solution is to downwardly provide a stop baffle on the upper inner wall of the ceramic cover. The stop baffle is in extrusion fit with the auxiliary normally closed moving reed, causing the auxiliary normally closed moving reed to deform and separate from the auxiliary normally closed lead pin. The auxiliary normally closed moving reed resets under the action of its own elastic force and contacts the auxiliary normally closed lead pin, thereby realizing the monitoring of the conduction state of the main circuit of the contactor. Such a mechanical structure is reliable, stable, not easily interfered and failed, and the cost of structure implementation is low. Without the use of microswitches and Hall sensors, the contactor is more miniaturized, improving the space utilization rate of the equipment.

[0052] In the description of this specification, the descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0053] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention without departing from the principles and purposes of the present invention.

Claims

1. An auxiliary normally closed contact structure, comprising a ceramic cover (1), a mounting cavity formed in the ceramic cover (1), a pair of load lead terminals (2) and a pair of auxiliary normally closed lead pins (3) passing through the ceramic cover (1), a push assembly and an active spring (4) and an auxiliary normally closed moving spring (5) mounted on the push assembly are arranged in the mounting cavity; the characteristics are as follows: The auxiliary normally closed movable spring (5) is located above the active spring (4), and comprises a connecting portion (6) fixed on the pushing component and contact portions (7) formed on both sides of the connecting portion (6). When the pushing component is not in motion, the contact portion (7) of the auxiliary normally closed movable spring (5) contacts a pair of auxiliary normally closed lead pins (3), and the active spring (4) is separated from the pair of load lead terminals (2); The upper inner wall of the ceramic cover (1) is provided with a pair of stop baffles (8) extending downwards. The pair of stop baffles (8) are located between the pair of auxiliary normally closed lead-out needles (3). The lower end of the stop baffle (8) is not lower than the lower end of the auxiliary normally closed lead-out needle (3). When the push assembly is actuated, the active spring (4) is driven to move upwards and contact the pair of load lead-out terminals (2). The contact portion (7) of the auxiliary normally closed moving spring (5) is squeezed upwards by the stop baffle (8) and deformed into a downwardly inclined state. The contact portion (7) of the auxiliary normally closed moving spring (5) is separated from the pair of auxiliary normally closed lead-out needles (3).

2. An auxiliary normally closed contact structure according to claim 1, characterized in that: The stop baffle (8) is arranged along the width direction of the auxiliary normally closed movable spring (5), and the width of the stop baffle (8) is equal to the width of the contact portion (7).

3. The auxiliary normally closed contact structure according to claim 1, characterized in that: The cross section of the stop baffle (8) facing the load lead-out end (2) is in a triangular shape with a width that gradually decreases from top to bottom.

4. An auxiliary normally closed contact structure according to claim 3, characterized in that: The lower end of the stop baffle (8) has an arc transition.

5. An auxiliary normally closed contact structure according to claim 4, characterized in that: The lower end of the stop baffle (8) corresponds to the middle of the contact portion (7).

6. An auxiliary normally closed contact structure according to claim 5, characterized in that: A raised section (9) is formed on the contact portion (7) near the connecting portion (6), and the raised section (9) is located on the inner side of the stop baffle (8).

7. A contactor, comprising an auxiliary normally closed contact structure as claimed in any one of claims 1 to 6.

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