Magnetic circuit structure and contactor

Abstract

The invention discloses a magnetic circuit structure and a contactor, the magnetic circuit structure is configured to comprise a left coil, a left pole shoe, a middle pole shoe, a right coil, a right pole shoe and an armature, the middle pole shoe is located at the symmetric center of a magnetic circuit, and the left coil, the right coil, the left pole shoe and the right pole shoe are located at the two sides of the middle pole shoe respectively; relatively independent magnetic steels are respectively arranged between the left coil and the right coil and between the left pole shoe and the right pole shoe; the armature is connected with the bottom end of the middle pole shoe; the armature has a neutral position state, a first deflection state and a second deflection state; in the neutral position state, the armature is suspended and is not in contact with the left pole shoe and the right pole shoe when the magnetic circuit is in the initial state and the left coil and the right coil are powered up at the same time; in the first deflection state, the armature is in contact with the left pole shoe under the condition that the left coil of the magnetic circuit is powered up; and in the second deflection state, the armature is in contact with the right pole shoe under the condition that the right coil of the magnetic circuit is powered up. According to the magnetic circuit structure, the three-state function of the armature is realized.

Description

Technical Field

[0001] The invention belongs to the field of contactors, and in particular relates to a magnetic circuit structure and a contactor, in particular to a magnetic circuit structure for a neutral disconnect contactor. Background Art

[0002] The existing contactor has a biased structure when the magnetic circuit structure is not powered, that is, the armature and the pole shoe are in a fitted state, and the operation is controlled by a single coil. After the coil is powered, the armature moves in a specific single direction and the magnetic circuit neutral state cannot be achieved. Summary of the invention

[0003] In order to realize the neutral state of the magnetic circuit, the present invention provides a magnetic circuit structure, which can realize the three-state function of the armature.

[0004] The magnetic circuit structure is configured to include a left coil, a left pole shoe, a middle pole shoe, a right coil, a right pole shoe and an armature, wherein the middle pole shoe is located at the symmetrical center of the magnetic circuit, the left coil, the right coil, the left pole shoe and the right pole shoe are respectively located on both sides of the center pole shoe, and relatively independent magnetic steels are respectively provided between the left and right coils and the left and right pole shoes, and the armature is connected to the bottom end of the middle pole shoe; the armature includes a neutral state, a first deflection state and a second deflection state; in the neutral state, when the magnetic circuit is in the initial state and the left and right coils are energized at the same time, the armature is suspended and does not contact the left and right pole shoes; in the first deflection state, when the left coil of the magnetic circuit is energized, the armature is in contact with the left pole shoe; in the second deflection state, when the right coil of the magnetic circuit is energized, the armature is in contact with the right pole shoe.

[0005] The magnetic circuit structure realizes a neutral balance state of the armature, and independently controls the left and right rotational movements of the armature through the left and right coils, thereby realizing the three-state function of the armature.

[0006] In some embodiments, the intermediate pole shoe is in an inverted T-shape and is perpendicular to the armature in an initial state, and the shoulder of the intermediate pole shoe and the armature are matched to form a V-shape, which is beneficial to reducing the magnetic gap between the armature and the pole shoe without affecting the rotational stroke of the armature.

[0007] In some embodiments, the left and right pole shoes are respectively equipped with a spring-loaded device for adjusting the balance state and the operating voltage of the magnetic circuit, and the spring-loaded device includes a hollow bolt, a compression spring located in the hollow bolt, a push rod located at the top of the compression spring, and an adjusting screw, one end of the adjusting screw is located in the hollow bolt, and the other end is located outside the hollow bolt. By adjusting the length of the adjusting screw in the hollow bolt, the size of the reaction force of the compression spring on the push rod can be adjusted; the push rod is used to contact a gasket connected to the armature.

[0008] The configuration of the ejector realizes the balance state of the magnetic circuit and the adjustability of the armature action voltage.

[0009] The present invention also provides a contactor, which comprises the magnetic circuit structure provided by the present invention and constitutes a neutral disconnect contactor.

[0010] The beneficial effects of the present invention are: the magnetic circuit structure realizes the three-state function of the armature; the magnetic steel, pole shoe and armature in the magnetic circuit structure form a permanent magnetic circuit, and when the coil is energized, the magnetic lines of force of the permanent magnetic circuit and the coil excitation magnetic circuit have the same direction, which enhances the efficiency of the magnetic circuit and reduces the power consumption of the coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The accompanying drawings are part of this application and are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0012] Figure 1 A schematic diagram of a neutral contactor described in the present invention;

[0013] Figure 2 It is a front view of the magnetic circuit structure of the present invention;

[0014] Figure 3 It is a left side view of the magnetic circuit structure of the present invention;

[0015] Figure 4 It is a top view of the magnetic circuit structure of the present invention

[0016] Figure 5 It is a partial view of the main view of the magnetic circuit structure of the present invention;

[0017] Figure 6 is a cross-sectional view of the ejector described in the present invention;

[0018] Figure 7 Schematic diagram of the main loop of initial magnetic induction lines of the magnetic circuit structure of the present invention;

[0019] Figure 8 It is a schematic diagram of the main circuit of magnetic induction lines when the left coil of the magnetic circuit structure of the present invention is electrically excited;

[0020] Fig. 9 It is a schematic diagram of the main loop of magnetic induction lines when the right coil of the magnetic circuit structure of the present invention is electrically excited. DETAILED DESCRIPTION

[0021] The technical solution claimed for protection by the patent of the present invention is further described in detail here with reference to the accompanying drawings and specific implementation methods.

[0022] Reference Figure 1 The contactor shown realizes the double-coil neutral disconnection function, that is, when the coil is not energized, the main contacts are in the disconnected state. When the coil AB is energized, the left main contact is connected and the right main contact is still in the disconnected state; when the coil XY is energized, the right main contact of the product is connected and the left main contact is still in the disconnected state; when the two coils are energized at the same time, the left and right contacts are both in the disconnected state.

[0023] The neutral state is the state in which the armature does not deflect and is suspended in the air without being in contact with the pole shoe when the armature is in the initial state (the coil is not energized) and the coil is energized.

[0024] The neutral contactor is a contactor whose armature is suspended in the neutral state in order to realize the three-state function of the neutral disconnect contactor. The characteristics of the neutral disconnect contactor are: the contactor exists in three states. State 1: When both the left and right coils are not powered or both are powered, the left and right contacts are not connected, and the contactor is in the neutral disconnected state; State 2: When the left coil is powered and the right coil is not powered, the left contact is connected; State 3: When the left coil is not powered and the right coil is powered, the right contact is connected.

[0025] Conventional contactors only have two states, that is, the contact is connected or disconnected, and cannot realize the three-state function described above. The neutral contactor has the opposite direction of armature rotation, which realizes the armature rotation in two opposite directions; the neutral disconnect contactor is mainly used for dual power switching, such as using the neutral disconnect contactor to realize the switching between aircraft ground power and aircraft power or the switching between generator and battery power.

[0026] In order to realize the function of the above-mentioned neutral contactor, a magnetic circuit structure is configured, which combines Figure 2-9 As shown, the configuration includes a support column 1, a fixing plate 2, a left coil 3, a right coil 4, an armature 6, a gasket 7, an intermediate pole shoe 8, a limiting member 9, a fixing plate 10, a shaft 11, a screw 12, a first nut 13, a bolt 14, a left pole shoe 15, a right pole shoe 16, a left magnet 17, a right magnet 18, and an iron core 24.

[0027] The left pole shoe 15 and the right pole shoe 16 are respectively welded to the left and right inner walls of the support column 1 to form a pole shoe part. The left coil 3 and the right coil 4 are respectively mounted on the left and right pole shoes. The middle pole shoe 8 is located between the left and right pole shoes and at the symmetrical center of the magnetic circuit. The left magnetic steel 17 and the right magnetic steel 18 are respectively located between the left and right coils and the left and right pole shoes. The bolt 14 is inserted into the matching hole of the magnetic steel and the coil and fixed by the first nut 13 to form the magnetic circuit part-1. The gasket 7 and the armature 6 are assembled together to form the armature part-1. The shaft 11 is riveted on the armature part-1 to form the armature part-2. The armature part 2 and the magnetic circuit part 1 are assembled together by the screw 12, the fixing plate 10 and the limiter 9 to form a magnetic circuit structure. Figure 2-5 shown.

[0028] In the present disclosure, the magnetic steel assembly position is parallel to the coil and the armature, forming a completely symmetrical magnetic circuit structure at both ends of the middle pole shoe to ensure the effectiveness of independent control of the left and right poles.

[0029] In the initial state of the magnetic circuit structure and when both the left and right coils are energized, the armature 6 is in a neutral balance state, and the left and right rotational movements of the armature 6 are independently controlled by the left and right coils, thereby realizing the three-state function of the armature 6.

[0030] In the initial state (the coil is not energized), the permanent magnetic circuit formed by the left and right magnets is in a balanced state (see attached Figure 7 As shown), the resultant torque of the electromagnetic attraction forces generated by the left and right magnetic steels on the armature 6 is zero, and the armature is in a neutral state (the armature is in a suspended state and does not fit the pole shoe).

[0031] When the left coil is powered, the left pole shoe, armature, middle pole shoe and left coil form the main magnetic circuit (see attached Figure 8 ), the armature contacts the left pole shoe to form a first deflection state; in this state, the direction of the permanent magnetic circuit formed by the left magnet, the left pole shoe, the middle pole shoe and the armature is the same as the magnetic circuit direction of the main magnetic circuit, which enhances the magnetic circuit efficiency and reduces the power consumption of the coil.

[0032] When the right coil is powered, the right pole shoe, armature, middle pole shoe and left coil form the main magnetic circuit (see attached Fig. 9 ), the armature contacts the right pole shoe to form a second deflection state; in this state, the direction of the permanent magnetic circuit formed by the right magnet, the right pole shoe, the middle pole shoe and the armature is the same as the magnetic circuit direction of the main magnetic circuit, which enhances the magnetic circuit efficiency and reduces the power consumption of the coil.

[0033] When the left and right coils are energized at the same time, the combined torque of the electromagnetic attraction generated by the left and right coils and the left and right magnets on the armature is zero, and the armature is in a neutral parallel state (the armature is suspended and does not fit the pole shoe).

[0034] In order to reduce the magnetic gap between the armature and the pole shoe without affecting the rotational stroke of the armature, the intermediate pole shoe 8 in the present magnetic circuit structure is in an inverted T shape and is perpendicular to the armature 6 in the initial state; the shoulder of the intermediate pole shoe and the armature form a V shape.

[0035] The magnetic circuit structure is also equipped with a spring ejector 5, including a hollow bolt 19, a second nut 20, a push rod 21, a compression spring 22 and an adjusting screw 23; Figure 6 As shown, the hollow bolt 19, the second nut 20, the push rod 21, the compression spring 22 and the adjusting screw 23 are assembled together to form the ejector 5, and the ejector 5 is respectively assembled to the left and right pole shoes, and the push rod 21 is used to fit the gasket 7.

[0036] The working process of the ejector is as follows: in the initial state, the ejector rod 21 on the ejector 5 is in contact with the gasket 7. After the coil is energized, the armature rotates, and the ejector rod 21 of the ejector 5 is compressed and retreats into the inner hole of the hollow bolt 19. After the coil is not energized, under the action of the reaction force of the compression spring 22, the ejector rod 21 of the ejector 5 extends out and resets, pushing the armature 6 to rotate in the opposite direction and return to the neutral state.

[0037] By adjusting the adjusting screw 23 on the ejector 5, the size of the reaction force of the compression spring 22 on the ejector rod 21 of the ejector 5 can be adjusted. The ejector rod 21 on the ejector 5 is in contact with the gasket 7, thereby assisting in adjusting the size of the reaction force received by the armature in the initial state, and further adjusting the balance state of the magnetic circuit part and the operating voltage (the voltage that causes the armature to operate).

[0038] The above embodiments are only used to illustrate the technical solution of the patent of the present invention rather than to limit it. Any modification or equivalent substitution made to the technical solution of the patent of the present invention by ordinary technicians in this field shall be included in the scope of the claims of the present invention as long as it does not depart from the spirit and scope of the technical solution of the patent of the present invention.

Claims

1. A magnetic circuit structure, characterized in that: The magnetic circuit structure is configured to include a left coil, a left pole shoe, a middle pole shoe, a right coil, a right pole shoe and an armature, wherein the middle pole shoe is located at the symmetrical center of the magnetic circuit, the left coil, the right coil, the left pole shoe and the right pole shoe are respectively located on both sides of the center pole shoe, relatively independent magnetic steels are respectively provided between the left and right coils and the left and right pole shoes, and the armature is connected to the bottom end of the middle pole shoe; the armature includes a neutral state, a first deflection state and a second deflection state; In the neutral state, when the magnetic circuit is in the initial state and the left and right coils are energized at the same time, the armature is suspended in the air and does not contact the left and right pole shoes; In the first deflection state, when the left coil of the magnetic circuit is energized, the armature is in contact with the left pole shoe; In the second deflection state, when the right coil of the magnetic circuit is energized, the armature is in contact with the right pole shoe.

2. The magnetic circuit structure according to claim 1, characterized in that: The intermediate pole shoe is in an inverted T-shape and is perpendicular to the armature in an initial state, and the shoulder of the intermediate pole shoe cooperates with the armature to form a V-shape.

3. The magnetic circuit structure according to claim 1, characterized in that: The left and right pole shoes are respectively equipped with spring-loaded devices for adjusting the balance state and operating voltage of the magnetic circuit. The spring-loaded devices include a hollow bolt, a compression spring located in the hollow bolt, a push rod located at the top of the compression spring, and an adjusting screw. One end of the adjusting screw is located in the hollow bolt, and the other end is located outside the hollow bolt. By adjusting the length of the adjusting screw in the hollow bolt, the size of the reaction force of the compression spring on the push rod can be adjusted; the push rod is used to contact a gasket connected to the armature.

4. A contactor, characterized in that: The contactor comprises the magnetic circuit structure described in any one of claims 1 to 3, constituting a neutral disconnect contactor.

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