Arc extinguishing structure of non-polar direct current contactor and direct current contactor

Abstract

The utility model discloses an arc extinguishing structure of a non-polar direct current contactor and a direct current contactor, and belongs to the technical field of contactors. The arc extinguishing structure comprises a fixing frame, four permanent magnets and four magnetic conductive sheets. The fixing frame is of a rectangular structure, and the four permanent magnets are embedded in rectangular holes in four side plates of the fixing frame respectively. The N poles of the two oppositely arranged permanent magnets face the interior of the fixing frame; the S poles of the other two oppositely arranged permanent magnets face the interior of the fixing frame; the magnetic conductive sheet is provided with two extending parts which are perpendicular to each other; the magnetic conductive sheets are installed at the corner positions of the fixing frame, and the two extension parts of each magnetic conductive sheet are attached to the outer surfaces of the two adjacent permanent magnets respectively. The direct current contactor comprises the arc extinguishing structure. According to the arc extinguishing structure provided by the utility model, the arc blowing space is larger, and the use stability of products is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of contactors, in particular to an arc extinguishing structure of a non-polarity DC contactor and a DC contactor. Background Art

[0002] The arc extinguishing system of DC contactor is divided into polar arc extinguishing and non-polar arc extinguishing. Polar arc extinguishing means that the contactor needs to be wired according to the positive and negative poles marked on the contactor during use. If the contactor wiring is wrong, it will cause abnormal contactor switching and contactor failure. Non-polarity means that there is no need to distinguish between positive and negative poles during the use of the contactor. Non-polar DC contactors are increasingly favored by various power distribution fields due to their easy installation and high reliability. Since the traditional non-polar DC contactor arc extinguishing system only relies on two permanent magnets to provide arc extinguishing magnetic field, as the load demand of the contactor increases, in order to ensure the arc extinguishing magnetic field strength of the contactor, the size of the permanent magnet used in the contactor is getting larger and larger, which is difficult to assemble during the assembly process, and the contactor has a large external size.

[0003] Due to the limited size of the contactor, the arc extinguishing magnetic field strength of the large-load polar DC contactor often fails to meet the requirements, resulting in a long arcing time during the disconnection process of the DC contactor, thus affecting the electrical life of the contactor.

[0004] Traditional non-polarity DC contactors mainly rely on the magnetic field formed by two permanent magnets to extinguish arcs. When the load interrupted by the contactor is large, in order to meet the magnetic field strength required for arc extinguishing, the permanent magnets used in the contactor are large in size, which makes the contactor difficult to assemble during the assembly process and the contactor has a large external size.

[0005] In the prior art, a patent application with publication number WO2023096163A1 discloses an arc chamber and a DC relay including the arc chamber. The DC relay arc extinguishing system includes 4 permanent magnets and 2 magnetic conductive sheets. The 4 permanent magnets of the same direction (N levels) provide a magnetic field for the relay arc extinguishing system. The two magnetic conductive sheets have the function of reducing leakage magnetic field and enhancing the magnetic field. The arc extinguishing ability of this structure is relatively superior to that of the traditional arc extinguishing system under the condition of the same external dimensions. However, the arc blowing direction of this structure is the installation direction of the magnetic steel, the arc burning space is narrow, and the arc moving in the magnetic field is easy to hit the inside of the arc extinguishing cavity, which is not conducive to the rapid extinction of the arc. Utility Model Content

[0006] The main purpose of the utility model is to propose an arc extinguishing structure of a non-polarity DC contactor, which has a faster arc movement speed and a wider arc burning space, is conducive to quickly blowing out the arc, and aims to solve the above technical problems.

[0007] To achieve the above-mentioned purpose, on the one hand, the utility model proposes an arc extinguishing structure of a non-polarity DC contactor, including a fixed frame, four permanent magnets and four magnetic conductive sheets; the fixed frame is a rectangular structure, and the four permanent magnets are respectively embedded in the rectangular holes on the four side plates of the fixed frame; the N poles of two relatively arranged permanent magnets face the inside of the fixed frame; the S poles of the other two relatively arranged permanent magnets face the inside of the fixed frame; the magnetic conductive sheet has two mutually perpendicular extensions; the magnetic conductive sheet is installed at the corner position of the fixed frame, and the two extensions of each magnetic conductive sheet are respectively attached to the outer surfaces of two adjacent permanent magnets.

[0008] Preferably, the four permanent magnets are respectively arranged on the four side plates of the fixed frame in sequence as the first permanent magnet, the second permanent magnet, the third permanent magnet, and the fourth permanent magnet; the first permanent magnet and the third permanent magnet are respectively embedded in the left and right side plates of the fixed frame, and the N poles of the first permanent magnet and the third permanent magnet are facing the inside of the fixed frame; the second permanent magnet and the fourth permanent magnet are respectively embedded in the front and rear side plates of the fixed frame, and the S poles of the second permanent magnet and the fourth permanent magnet are facing the inside of the fixed frame.

[0009] Preferably, the upper and lower edges of the outer surface of the side plate of the fixing frame protrude outward to form an upper clamping platform and a lower clamping platform respectively; a transverse clamping groove is formed between the upper clamping platform and the lower clamping platform; and the extension portion of the magnetic conductive sheet is installed in the transverse clamping groove.

[0010] Preferably, an interference fit is formed between the extension portion of the magnetic conductive sheet and the upper clamping platform and the lower clamping platform.

[0011] Preferably, the height of the lower card platform is greater than the height of the upper card platform.

[0012] Preferably, there is a gap between the extension portions of two adjacent magnetic conductive sheets, and the gap is ≥0.3 mm.

[0013] Preferably, the wall thickness of the four corners of the fixing frame is reduced to form a relief depression.

[0014] Preferably, the magnetic conductive sheet further comprises a connecting portion, and the two extending portions are integrally formed on both sides of the connecting portion; the connecting portion is disposed in the lightening recess.

[0015] Preferably, a chamfer is provided at one corner of each permanent magnet, and a corresponding chamfer is also provided on the corresponding rectangular hole; and the positions of the chamfers of different permanent magnets are different.

[0016] On the other hand, the utility model also provides a DC contactor, which includes the above arc extinguishing structure.

[0017] Due to the adoption of the above technical solution, the beneficial effects of the utility model are as follows:

[0018] (1) In the utility model, four permanent magnets are respectively embedded in the rectangular holes on the four side plates of the fixing frame, and the N poles of two of the permanent magnets disposed opposite to each other are oriented toward the inside of the fixing frame; the S poles of the other two permanent magnets disposed opposite to each other are oriented toward the inside of the fixing frame. In this way, no matter which side of the contactor is connected to the positive pole of the power supply, the direction of the Lorentz force exerted on the arc in the magnetic field is diagonally toward the arc extinguishing structure, that is, toward the corner direction of the fixing frame. The contactor has no polarity requirement, and the contactor has a larger arc blowing space, and the possibility of the arc hitting the ceramic seat is reduced, thereby improving the stability of product use.

[0019] (2) In the arc extinguishing structure provided by the present invention, the magnetic field strength along the arc blowing direction shows an upward trend. The Lorentz force exerted on the arc during its movement becomes increasingly stronger, and the arc movement speed is faster, which is more conducive to the arc moving to the edge of the contact and extinguishing quickly, thereby shortening the arc burning time of the contactor.

[0020] (3) Since the arc blowing direction of the arc extinguishing structure is theoretically diagonally opposite to the arc extinguishing chamber, that is, toward the corner of the fixed frame, the arc burning space is large, which reduces the risk of the arc hitting the inside of the arc extinguishing chamber during the use of the contactor and improves the safety of the contactor.

[0021] (4) Under the same arc extinguishing magnetic field strength, the permanent magnet required by the utility model is small in size, which is more conducive to product assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0023] Figure 1 An exploded diagram of the arc extinguishing structure provided by the utility model;

[0024] Figure 2 A schematic diagram of the arc extinguishing structure provided by the utility model;

[0025] Figure 3 A cross-sectional schematic diagram of the arc extinguishing structure provided by the utility model;

[0026] Figure 4 It is a structural schematic diagram of the fixing frame in the utility model;

[0027] Figure 5 Schematic diagram of magnetic blowing of the arc extinguishing structure provided by the utility model Figure 1

[0028] Figure 6 Schematic diagram of magnetic blowing of the arc extinguishing structure provided by the utility model Figure 2 ;

[0029] Figure 7 A schematic diagram of the arc extinguishing structure provided by the utility model cooperating with the contact component of the contactor;

[0030] Figure 8 This is a cross-sectional view of the arc extinguishing structure provided by the utility model after being assembled on a contactor.

[0031] Explanation of the accompanying drawings: 1. Fixing frame; 1a. Rectangular hole; 1b. Reducing depression; 1c. Upper clamping platform; 1d. Lower clamping platform; 2a. First permanent magnet; 2b. Second permanent magnet; 2c. Third permanent magnet; 2d. Fourth permanent magnet; 3. Magnetic conductive sheet; 3a. Extension portion; 3b. Connecting portion. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only 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.

[0033] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0034] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0035] Combination Figures 1 to 4As shown, a specific embodiment of an arc extinguishing structure of a non-polarity DC contactor provided by the utility model is shown, and the arc extinguishing structure includes a fixing frame 1, four permanent magnets and four magnetic conductive sheets 3; the fixing frame 1 is a rectangular structure, and the four permanent magnets are respectively embedded in the rectangular holes 1a on the four side plates of the fixing frame 1; the N poles of two oppositely arranged permanent magnets face the inside of the fixing frame 1; the S poles of the other two oppositely arranged permanent magnets face the inside of the fixing frame 1; the magnetic conductive sheet 3 has two mutually perpendicular extensions 3a; the magnetic conductive sheet 3 is installed at the corner position of the fixing frame 1, and the two extensions 3a of each magnetic conductive sheet 3 are respectively attached to the outer surfaces of two adjacent permanent magnets. Specifically, the four permanent magnets are respectively arranged on the four side plates of the fixed frame 1, namely the first permanent magnet 2a, the second permanent magnet 2b, the third permanent magnet 2c, and the fourth permanent magnet 2d; the first permanent magnet 2a and the third permanent magnet 2c are respectively embedded in the left and right side plates of the fixed frame 1, and the N poles of the first permanent magnet 2a and the third permanent magnet 2c are facing the inside of the fixed frame 1; the second permanent magnet 2b and the fourth permanent magnet 2d are respectively embedded in the front and rear side plates of the fixed frame 1, and the S poles of the second permanent magnet 2b and the fourth permanent magnet 2d are facing the inside of the fixed frame 1.

[0036] Since the N poles of the first permanent magnet 2a and the third permanent magnet 2c face the inside of the fixed frame 1, the magnetic fields of the two are in opposite directions; similarly, the S poles of the second permanent magnet 2b and the fourth permanent magnet 2d face the inside of the fixed frame 1, and the magnetic fields of the two are in opposite directions. Therefore, the magnetic field distribution in the inner cavity of the arc extinguishing structure is as follows: Figure 5 , Figure 6 As shown, in the inner cavity of the arc extinguishing structure, the magnetic flux lines are emitted from the N poles of the first permanent magnet 2a and the third permanent magnet 2c to the S poles of the second permanent magnet 2b and the fourth permanent magnet 2d. During the process of the contactor breaking the current, the arc is subjected to the Lorentz force in the magnetic field in the direction as shown in FIG. Figure 5 , Figure 6 As shown, no matter which side of the contactor is connected to the positive pole of the power supply, the direction of the Lorentz force on the arc in the magnetic field is toward the diagonal direction of the inner cavity (that is, toward the corner direction of the fixed frame). The contactor has no polarity requirements, and the contactor has a larger arc blowing space (diagonal direction), and the possibility of the arc hitting the ceramic seat is reduced, which improves the stability of product use. From the distribution of magnetic flux lines, it is known that the smaller the distance to the permanent magnet, the denser the distribution of magnetic flux lines, and the greater the magnetic field strength. The density of magnetic flux lines in the arc extinguishing structure gradually increases from the center to the diagonal direction of the inner cavity (the direction of the arc force), and the Lorentz force on the arc in the magnetic field gradually increases.

[0037] In the arc extinguishing structure, the function of the magnetic conductive sheet 3 is to reduce magnetic leakage and enhance the effect of the magnetic field. The function of the fixing frame 1 is to fix the permanent magnet and install the magnetic conductive sheet.

[0038] Combination Figure 4As shown, in order to facilitate the installation of the magnetic conductive sheet 3, the upper and lower edges of the outer surface of the side plate of the fixing frame 1 are respectively protruded outward to form an upper clamping platform 1c and a lower clamping platform 1d; a transverse clamping groove is formed between the upper clamping platform 1c and the lower clamping platform 1d; the extension 3a of the magnetic conductive sheet 3 is installed in the transverse clamping groove. Specifically, the extension 3a of the magnetic conductive sheet 3 forms an interference fit with the upper clamping platform 1c and the lower clamping platform 1d. During installation, the extension 3a of the magnetic conductive sheet 3 is pressed into the transverse clamping groove to complete the assembly.

[0039] Combination Figure 4 As shown, the height H of the lower clamping platform 1d is greater than the height h of the upper clamping platform 1c. By using different heights for the lower clamping platform 1d and the upper clamping platform 1c, when the permanent magnet and the magnetic conductive sheet 3 are assembled on the fixing frame 1, the direction of the arc extinguishing structure can be determined by directly observing the thickness difference, so as to facilitate assembly. Figure 7 As shown, when the arc extinguishing structure is assembled on the contact component, it is required that the end where the upper clamping platform 1c is located faces upward.

[0040] Combination Figure 5 As shown, there are gaps t1 and t2 between the extensions 3a of two adjacent magnetic conductive sheets 3, and both t1 and t2 are ≥ 0.3 mm. By setting the gap, interference between two adjacent magnetic conductive sheets 3 during assembly is avoided, thereby ensuring that the extensions 3a of the magnetic conductive sheets 3 can fit tightly on the permanent magnet.

[0041] Combination Figure 3 , Figure 4 As shown, the wall thickness of the four corners of the fixing frame 1 is reduced to form a lightening recess 1b. The magnetic conductive sheet 3 also includes a connecting portion 3b, and the two extension portions 3a are integrally formed on both sides of the connecting portion 3b; the connecting portion 3b is arranged in the lightening recess 1b. The purpose of setting the lightening recess 1b is to reduce the weight of the fixing frame 1, and at the same time form an assembly space for the connecting portion 3b, so that the volume of the entire arc extinguishing structure is compact. The maximum contour of the outer periphery of the entire arc extinguishing structure is as shown in FIG. Figure 3 As shown in the dotted box E in the figure, since the relief recess 1b is provided and the connecting portion 3b is provided in the relief recess 1b, a triangular clearance space D is formed at the four corners of the dotted box E. Since the triangular clearance space D exists on the periphery of the arc extinguishing structure, the volume of the arc extinguishing structure is reduced, and the space it occupies in the contactor is reduced.

[0042] Combination Figure 1 As shown, a chamfered angle A is provided at one corner of each permanent magnet, and a corresponding chamfered angle B is also provided on the corresponding rectangular hole 1a; different permanent magnets have different chamfered angles. By providing a chamfered angle structure, an error-proof structure is formed to avoid permanent magnet installation errors. Specifically, combined with Figure 1As shown, when viewed from the outside to the inside, the first permanent magnet 2a has a chamfered corner at the lower left corner, while the fourth permanent magnet 2d has a chamfered corner at the lower right corner. The first permanent magnet 2a and the fourth permanent magnet 2d cannot be installed in the corresponding rectangular hole 1a of the fixing frame 1 after being misaligned.

[0043] On the other hand, combined Figure 7 , Figure 8 As shown, this embodiment also provides a DC contactor, which includes the above-mentioned arc extinguishing structure.

[0044] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made under the concept of the present invention using the contents of the specification and drawings of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An arc extinguishing structure of a non-polarity DC contactor, characterized in that: It comprises a fixing frame (1), four permanent magnets and four magnetic conductive sheets (3); the fixing frame (1) is a rectangular structure, and the four permanent magnets are respectively embedded in rectangular holes (1a) on four side plates of the fixing frame (1); The N poles of the two permanent magnets disposed opposite to each other face the interior of the fixed frame (1); The S poles of the other two permanent magnets arranged opposite to each other face the interior of the fixed frame (1); The magnetic conductive sheet (3) has two mutually perpendicular extension parts (3a); the magnetic conductive sheet (3) is installed at a corner position of the fixed frame (1), and the two extension parts (3a) of each magnetic conductive sheet (3) are respectively attached to the outer surfaces of two adjacent permanent magnets.

2. The arc extinguishing structure according to claim 1, characterized in that: Four permanent magnets are respectively arranged in sequence on four side plates of the fixing frame (1), namely a first permanent magnet (2a), a second permanent magnet (2b), a third permanent magnet (2c), and a fourth permanent magnet (2d); The first permanent magnet (2a) and the third permanent magnet (2c) are respectively embedded in the left and right side plates of the fixing frame (1), and the N poles of the first permanent magnet (2a) and the third permanent magnet (2c) face the inside of the fixing frame (1); The second permanent magnet (2b) and the fourth permanent magnet (2d) are respectively embedded in the front and rear side plates of the fixing frame (1), and the S poles of the second permanent magnet (2b) and the fourth permanent magnet (2d) face the inside of the fixing frame (1).

3. The arc extinguishing structure according to claim 1, characterized in that: The upper and lower edges of the outer surface of the side plate of the fixing frame (1) protrude outwards to form an upper clamping platform (1c) and a lower clamping platform (1d) respectively; A transverse slot is formed between the upper card platform (1c) and the lower card platform (1d); the extension portion (3a) of the magnetic conductive sheet (3) is installed in the transverse slot.

4. The arc extinguishing structure according to claim 3, characterized in that: An interference fit is formed between the extension portion (3a) of the magnetic conductive sheet (3) and the upper clamping platform (1c) and the lower clamping platform (1d).

5. The arc extinguishing structure according to claim 3, characterized in that: The height of the lower clamping platform (1d) is greater than the height of the upper clamping platform (1c).

6. The arc extinguishing structure according to claim 1, characterized in that: There is a gap between the extension parts (3a) of two adjacent magnetic conductive sheets (3), and the gap is ≥0.3 mm.

7. The arc extinguishing structure according to claim 1, characterized in that: The wall thickness of the four corners of the fixing frame (1) is reduced to form a lightening recess (1b).

8. The arc extinguishing structure according to claim 7, characterized in that: The magnetic conductive sheet (3) further comprises a connecting portion (3b), and the two extending portions (3a) are integrally formed on both sides of the connecting portion (3b); the connecting portion (3b) is arranged in the lightening recess (1b).

9. The arc extinguishing structure according to claim 1, characterized in that: A chamfer is provided at one corner of each permanent magnet, and a corresponding chamfer is also provided on the corresponding rectangular hole (1a); the positions of the chamfers of different permanent magnets are different.

10. A DC contactor, characterized in that: The DC contactor comprises the arc extinguishing structure according to any one of claims 1 to 9.

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