Double-spring opening structure for vacuum alternating current contactor

Abstract

The utility model relates to a double-spring opening structure for a vacuum AC contactor, comprising an installation plate which is fixedly arranged on a bottom plate of a rack, and a coil is installed at the front side of the installation plate; the upper end of the armature is fixedly connected with the transmission shaft, the transmission shaft is rotationally arranged on the rack, and the armature rotates at the opening position and the closing position of the rack through the transmission shaft; the rear end of the opening spring assembly is connected with the mounting plate, the front end of the opening spring assembly is connected with the armature, and the opening spring assembly is suitable for enabling the armature to abut against the opening position; the opening spring assembly comprises an inner spring and an outer spring, the inner spring is arranged in the outer spring, the front end of the inner spring and the front end of the outer spring abut against the armature, and the rear end of the inner spring and the rear end of the outer spring abut against the mounting plate. The opening spring adopts a double-spring structure to share the self-closing force generated by the three vacuum arc extinguish chambers, and the fatigue life of the spring is longer.

Description

Technical Field

[0001] The utility model relates to the field of contactors, in particular to a double-spring opening structure for a vacuum AC contactor. Background Art

[0002] like Figure 1 As shown, the vacuum AC contactor includes an operating mechanism 2 and a three-phase arc extinguishing mechanism 1. The three-phase arc extinguishing mechanism 1 is installed on the upper 2 sides of the operating mechanism. The operating mechanism 2 is composed of a bracket, a transmission shaft 21, a coil 5 and an armature 3. A trip spring is arranged between the armature 3 and the bracket. The coil 5 has an iron core. When the coil 5 is energized or de-energized, the iron core drives the armature 3 to move. The trip spring is compressed at this time. At the same time, the armature 3 is connected to the transmission shaft. The transmission shaft is connected to the moving contact rod of the vacuum bubble in the three-phase arc extinguishing mechanism through three swing arms. When the armature 3 moves, it drives the transmission shaft to rotate forward and reverse. The transmission shaft then drives the three swing arms to move up and down, and drives the moving contact rod to move up and down. When the moving contact rod moves upward, the moving contact rod contacts the static contact rod in the vacuum bubble. At this time, the mechanism is closed, and the moving contact rod moves downward, so that the moving contact rod is separated from the static contact rod, and the mechanism is tripped at this time.

[0003] The current problem with vacuum AC contactors is that the three vacuum bubbles of the arc extinguishing mechanism have a self-closing force. The so-called self-closing force is that in the vacuum arc extinguishing chamber inside the vacuum bubble, the outside of the bellows is the atmosphere and the inside is a vacuum. There is an atmospheric pressure difference between the inside and outside of the bellows. This pressure causes the moving contact and the static contact to be pressed together, forming a contact self-closing force. Overcoming the self-closing force requires the rebound force of the opening spring. The opening spring pushes the armature, and the armature pulls the moving contact downward through the transmission shaft and the swing arm to disconnect the circuit. The original mechanism should remain open. In the past, only one opening spring was set. However, because the elastic force of the opening spring was insufficient or the opening spring was damaged, the moving contact rod automatically closed under the self-closing force of the three vacuum arc extinguishing chambers, which would cause safety hazards. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a double-spring opening structure for a vacuum AC contactor, so as to solve the problem of low reliability and potential safety hazards in the conventional operating mechanism which only adopts a single-spring structure.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A double spring opening structure for a vacuum AC contactor is provided, comprising:

[0007] A mounting plate, which is fixedly arranged on the bottom plate of the frame, and a coil is installed on the front side of the mounting plate;

[0008] An armature, the upper end of which is fixedly connected to a transmission shaft, the transmission shaft is rotatably arranged on the frame, and the armature rotates between an open position and a closed position of the frame via the transmission shaft;

[0009] A gate-opening spring assembly, the rear end of which is connected to the mounting plate, and the front end of which is connected to the armature, wherein the gate-opening spring assembly is suitable for abutting the armature at the gate-opening position;

[0010] The opening spring assembly comprises an inner spring and an outer spring, wherein the inner spring is arranged inside the outer spring, the front ends of the inner spring and the outer spring abut against the armature, and the rear ends of the inner spring and the outer spring abut against the mounting plate.

[0011] Furthermore, a front spring seat is provided between the front ends of the inner spring and the outer spring and the armature;

[0012] The front end of the front spring seat is connected to the armature, the rear end of the front spring seat forms a first step surface and a second step surface, the front end of the outer spring abuts against the first step surface, and the front end of the inner spring abuts against the second step surface.

[0013] Furthermore, a positioning hole is provided on the armature, a positioning column is formed at the front end of the front spring seat, and the positioning column is inserted into the positioning hole.

[0014] Furthermore, a rear spring seat is provided between the rear ends of the inner spring and the outer spring and the mounting plate;

[0015] The rear spring seat is connected to the mounting plate, and a third step surface and a fourth step surface are formed on the rear spring seat. The rear end of the outer spring abuts against the third step surface, and the rear end of the inner spring abuts against the fourth step surface.

[0016] Furthermore, an adjusting bolt is provided on the mounting plate, and the adjusting bolt forms a spiral fit with the mounting plate. The adjusting bolt is screwed in from the rear side of the mounting plate, and a threaded hole is provided in the rear spring seat, and the threaded hole cooperates with the adjusting bolt, and the front end of the adjusting bolt extends into the inner spring.

[0017] Furthermore, the diameter of the steel wire of the outer spring is greater than the diameter of the steel wire of the inner spring.

[0018] The beneficial effects of the utility model are:

[0019] The utility model provides a double-spring opening structure for a vacuum AC contactor. The opening spring adopts a double-spring structure to distribute the self-closing force generated by three vacuum arc extinguishing chambers, and the fatigue life of the spring is higher.

[0020] An extra layer of safety protection is provided. No matter the large spring or the small spring fails, the other spring can overcome the self-closing force of the arc extinguishing chamber and open the contacts. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The utility model is further described below in conjunction with the accompanying drawings.

[0022] Figure 1 It is a schematic diagram of a vacuum AC contactor;

[0023] Figure 2 This is a schematic diagram of the double spring opening structure of the vacuum AC contactor of the utility model;

[0024] Figure 3 This is a half-section diagram of the double-spring opening structure for the vacuum AC contactor of the utility model;

[0025] Figure 4 It is a schematic diagram of the front spring seat;

[0026] Figure 5 It is a schematic diagram of the rear spring seat;

[0027] Among them, 1. three-phase arc extinguishing mechanism, 2. operating mechanism, 21 transmission shaft,

[0028] 3. Armature, 4. Mounting plate, 5. Coil,

[0029] 61, inner spring, 62, outer spring;

[0030] 7. front spring seat, 71. first step surface, 72. second step surface, 73. positioning column;

[0031] 8. rear spring seat, 81. third step surface, 82. fourth step surface;

[0032] 9. Adjust the bolt. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] The present application provides a double spring opening structure for a vacuum AC contactor, which is described in detail below. It should be noted that the description order of the following embodiments is not intended to limit the preferred order of the embodiments of the present application. In the following embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0035] In order to solve the technical problem that the operating mechanism in the prior art only uses a single spring structure with low reliability and potential safety hazards, an embodiment of the present application provides a double spring opening structure for a vacuum AC contactor, which is described in detail below.

[0036] like Figures 1 to 5 As shown, a double spring opening structure for a vacuum AC contactor includes:

[0037] A mounting plate 4 is fixedly arranged on the bottom plate of the frame, and a coil 5 is installed on the front side of the mounting plate 4; the number of coils 5 is two;

[0038] The upper end of the armature 3 is fixedly connected to the transmission shaft, the transmission shaft is rotatably arranged on the frame, and the armature 3 rotates between the open position and the closed position of the frame via the transmission shaft;

[0039] A gate-opening spring assembly, the rear end of which is connected to the mounting plate 4, and the front end of which is connected to the armature 3, wherein the gate-opening spring assembly is suitable for abutting the armature 3 at the gate-opening position;

[0040] The opening spring assembly includes an inner spring 61 and an outer spring 62 . The inner spring 61 is arranged inside the outer spring 62 . The front ends of the inner spring 61 and the outer spring 62 abut against the armature 3 , and the rear ends of the inner spring 61 and the outer spring 62 abut against the mounting plate 4 .

[0041] Specifically, as an optional implementation in this embodiment, the front ends of the inner spring 61 and the outer spring 62 abut against the armature 3, as shown in FIG. Figures 2 to 5 As shown, a front spring seat 7 is arranged between the front ends of the inner spring 61 and the outer spring 62 and the armature 3;

[0042] like Figure 4 As shown, the front end of the front spring seat 7 is connected to the armature 3, and the rear end of the front spring seat 7 forms a first step surface 71 and a second step surface 72. The front end of the outer spring 62 abuts against the first step surface 71, and the front end of the inner spring 61 abuts against the second step surface 72.

[0043] A center column is formed in the middle of the second step surface 72 , and the center column is inserted into the inner spring 61 to limit the radial movement of the inner spring 61 .

[0044] Specifically, as an optional implementation method of the front end of the front spring seat 7 being connected to the armature 3 in this embodiment, as Figure 3 Figure 4 As shown, a positioning hole is provided on the armature 3, a positioning column 73 is formed at the front end of the front spring seat 7, and the positioning column 73 is inserted into the positioning hole.

[0045] The front spring seat 7 cooperates with the armature 3 through the positioning column 73, so that the front end of the entire opening spring assembly can be quickly installed with the armature 3. During installation, the inner spring 61 and the outer spring 62 are first compressed by the front spring seat 7, and then the front spring seat 7 cooperates with the positioning hole of the armature 3 through the positioning column 73 to achieve the positioning and cooperation of the inner spring 61, the outer spring 62 and the armature 3.

[0046] Specifically, as an optional implementation in this embodiment, the rear ends of the inner spring 61 and the outer spring 62 abut against the mounting plate 4, as shown in FIG. Figures 2 to 5 As shown, a rear spring seat 8 is provided between the rear ends of the inner spring 61 and the outer spring 62 and the mounting plate 4;

[0047] like Figure 5 As shown, the rear spring seat 8 is connected to the mounting plate 4 , and a third step surface 81 and a fourth step surface 82 are formed on the rear spring seat 8 . The rear end of the outer spring 62 abuts against the third step surface 81 , and the rear end of the inner spring 61 abuts against the fourth step surface 82 .

[0048] Specifically, as an optional implementation method of the connection between the rear spring seat 8 and the mounting plate 4 in this embodiment, as shown in FIG. Figures 2 to 5 As shown, an adjusting bolt 9 is arranged on the mounting plate 4, and the adjusting bolt 9 forms a spiral fit with the mounting plate 4. The adjusting bolt 9 is screwed in from the rear side of the mounting plate 4, and a threaded hole is provided in the rear spring seat 8, and the threaded hole cooperates with the adjusting bolt 9, and the front end of the adjusting bolt 9 extends into the inner spring 61.

[0049] The front end of the adjusting bolt 9 can limit the radial movement of the inner spring 61 .

[0050] In this embodiment, the adjusting bolt 9 includes a large diameter section and a small diameter section. The thread of the large diameter section is spirally connected to the mounting plate 4 , and the thread of the small diameter section is spirally connected to the rear spring seat 8 .

[0051] The front-rear position of the rear spring seat 8 can be adjusted by rotating the adjusting bolt 9, thereby adjusting the tightness of the inner spring 61 and the outer spring 62.

[0052] Specifically, as an optional implementation in this embodiment, Figure 3 As shown, the steel wire diameter of the outer spring 62 is greater than the steel wire diameter of the inner spring 61 .

[0053] When the vacuum AC contactor of the utility model is in operation, the coil 5 is energized, the internal iron core generates magnetic attraction to the armature 3 to rotate, the armature 3 drives the transmission shaft to rotate, and the transmission shaft drives the moving contact rod to lift upward through the swing arm, so that the vacuum bubble is closed; when the vacuum bubble needs to be opened, the coil 5 loses power, the armature 3 moves forward under the action of the inner spring 61 and the outer spring 62, the transmission shaft drives the moving contact rod to move downward through the swing arm, and the vacuum bubble is opened. At this time, the armature 3 is simultaneously subjected to the action of the inner spring 61 and the outer spring 62, and the action force can fully support the self-closing force brought by the vacuum bubble. The design of double springs provides an extra layer of safety protection for the armature 3 opening. No matter whether the large spring fails or the small spring fails, the other spring can overcome the self-closing force of the arc extinguishing chamber and pull open the contacts.

[0054] The various devices selected in this application (components whose specific structures are not described) are all universal standard parts or components known to technical personnel in this field, and their structures and principles can be known to technical personnel through technical manuals or through conventional experimental methods.

[0055] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0057] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0058] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0059] In addition, each functional unit in each embodiment of the present utility model may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0060] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A double spring opening structure for a vacuum AC contactor, characterized in that: include A mounting plate (4) is fixedly arranged on the bottom plate of the frame, and a coil (5) is mounted on the front side of the mounting plate (4); An armature (3) whose upper end is fixedly connected to a transmission shaft (21), wherein the transmission shaft (21) is rotatably arranged on the frame, and the armature (3) rotates between an open position and a closed position of the frame via the transmission shaft (21); A gate-opening spring assembly, the rear end of which is connected to the mounting plate (4) and the front end of which is connected to the armature (3), the gate-opening spring assembly being suitable for abutting the armature (3) at the gate-opening position; The opening spring assembly comprises an inner spring (61) and an outer spring (62), wherein the inner spring (61) is arranged inside the outer spring (62), the front ends of the inner spring (61) and the outer spring (62) abut against the armature (3), and the rear ends of the inner spring (61) and the outer spring (62) abut against the mounting plate (4).

2. The double spring opening structure for vacuum AC contactor according to claim 1 is characterized in that: A front spring seat (7) is arranged between the front ends of the inner spring (61) and the outer spring (62) and the armature (3); The front end of the front spring seat (7) is connected to the armature (3), the rear end of the front spring seat (7) forms a first step surface (71) and a second step surface (72), the front end of the outer spring (62) abuts against the first step surface (71), and the front end of the inner spring (61) abuts against the second step surface (72).

3. The double spring opening structure for vacuum AC contactor according to claim 2 is characterized in that: A positioning hole is provided on the armature (3), a positioning column (73) is formed at the front end of the front spring seat (7), and the positioning column (73) is inserted into the positioning hole.

4. The double spring opening structure for vacuum AC contactor according to claim 1 is characterized in that: A rear spring seat (8) is provided between the rear ends of the inner spring (61) and the outer spring (62) and the mounting plate (4); The rear spring seat (8) is connected to the mounting plate (4), and a third step surface (81) and a fourth step surface (82) are formed on the rear spring seat (8). The rear end of the outer spring (62) abuts against the third step surface (81), and the rear end of the inner spring (61) abuts against the fourth step surface (82).

5. The double spring opening structure for vacuum AC contactor according to claim 4 is characterized in that: An adjusting bolt (9) is arranged on the mounting plate (4), the adjusting bolt (9) and the mounting plate (4) form a spiral fit, the adjusting bolt (9) is screwed into the mounting plate (4) from the rear side, the rear spring seat (8) is provided with a threaded hole, the threaded hole is matched with the adjusting bolt (9), and the front end of the adjusting bolt (9) extends into the inner spring (61).

6. The double spring opening structure for vacuum AC contactor according to claim 1 is characterized in that: The diameter of the steel wire of the outer spring (62) is greater than the diameter of the steel wire of the inner spring (61).

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