Moving contact, static contact, contact structure and high-voltage direct current contactor

Abstract

The utility model discloses a moving contact, a static contact, a contact structure and a high voltage DC contactor, comprising a moving contact main body, the left end and the right end of the moving contact main body respectively form a moving contact part, and the middle positions of the two moving contact parts corresponding to the front side and the rear side are provided with contact avoiding grooves used for avoiding contact cooperation with the static contact end of the static contact. According to the utility model, the contact avoiding grooves are formed in the middle positions of the corresponding front and rear side edges of the movable contact part, and the static contact end of the static contact can be prevented from being in contact fit with the middle position of the movable contact part by using the contact avoiding grooves, so that the distribution position of electric arcs generated when the movable contact and the static contact are disconnected is changed; the arc generation position is kept away from the middle position where the moving contact and the static contact are in contact fit as much as possible, and therefore more arcs are distributed at the positions closer to the front side magnetic steel and the rear side magnetic steel in a concentrated mode, a stronger magnetic field is utilized to generate the arc blowing effect on the arcs, and the good arc extinguishing effect is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of contactors, and particularly relates to a moving contact, a static contact, a contact structure and a high-voltage DC contactor. Background Art

[0002] There is a magnetic steel configuration scheme for an existing contactor product, which is to arrange a magnetic steel on each side of the moving contact, and use two magnetic steels to achieve arc extinguishing. However, although the arc blowing direction of this double-magnetic-steel arc extinguishing scheme in the prior art is good and meets the requirement of non-polarity, the magnetic field strength is weak. Especially at the center position of the moving and static contact cooperation, the magnetic field strength is weak, which more affects the arc blowing effect, resulting in poor arc extinguishing ability and thus affecting the service life of the contactor product. Summary of the Utility Model

[0003] Aiming at the deficiencies of the prior art, the utility model provides a moving contact, which mainly solves the technical problem that the magnetic field strength at the center position of the moving and static contact cooperation of the existing contactor product is weak and more affects the arc blowing effect.

[0004] To achieve the above object, the utility model is realized through the following technical solutions:

[0005] A moving contact includes a moving contact body, and moving contact parts are respectively formed at both ends of the moving contact body. Contact avoidance grooves are formed on the two moving contact parts for avoiding contact and cooperation with the center position of the static contact end of the static contact.

[0006] Further, the bottom of the contact avoidance groove is in an open shape.

[0007] Further, the bottom of the contact avoidance groove is in a closed shape.

[0008] Further, the contact avoidance groove penetrates through the upper and lower surfaces of the moving contact part, so that the bottom of the contact avoidance groove is in an open shape, and the contact avoidance groove has a structure with a wider upper part and a narrower lower part.

[0009] Further, the moving contact is configured to be installed between two arc extinguishing magnetic steels inside the contactor, and the polarities of the sides of the two arc extinguishing magnetic steels facing the moving contact are the same.

[0010] Further, when the magnetic forces of the two arc extinguishing magnetic steels are the same, the contact avoidance grooves of the two moving contact parts are configured to be located on the symmetric center line L1 of the two arc extinguishing magnetic steels, and when the magnetic forces of the two arc extinguishing magnetic steels are different, the contact avoidance grooves of the two moving contact parts are configured to be located on the connecting line L2 of the magnetic force lines of the two arc extinguishing magnetic steels; preferably, the two arc extinguishing magnetic steels are arranged oppositely along the width direction of the moving contact body at both sides of the moving contact body.

[0011] Further, the polarities of the two arc extinguishing magnets on the side facing the moving contact are both N poles. Taking the contact avoidance groove as the middle separation position, the parts of the moving contact part close to the magnets on its front and rear sides are defined as the first magnetic field region B1 and the third magnetic field region B3, and the middle part of the moving contact part where the contact avoidance groove is opened is the second magnetic field region B2. The magnetic field intensity of the first magnetic field region B1 or the third magnetic field region B3 is greater than the magnetic field intensity of the second magnetic field region B2.

[0012] Further, the contact avoidance groove forms an arc diffusion space that facilitates the diffusion and extinction of the arc.

[0013] Based on the same inventive concept, the present utility model also provides a static contact for cooperating with the above-mentioned moving contact, including a static contact body. The lower end of the static contact body forms a static contact end and is arranged corresponding to the moving contact part of the moving contact body up and down.

[0014] Further, a groove corresponding to the contact avoidance groove is opened on the end surface of the static contact end, and an inclined plane for elongating the arc to improve the arc extinguishing effect is provided on the side surface of the static contact body.

[0015] Based on the same inventive concept, the present utility model also provides a contact structure, including any one of the above-mentioned moving contacts and / or any one of the above-mentioned static contacts.

[0016] Based on the same inventive concept, the present utility model also provides a high-voltage DC contactor, including the above-mentioned contact structure.

[0017] The above technical solutions have the following advantages or beneficial effects:

[0018] In the moving contact, static contact, contact structure and high-voltage DC contactor of the present utility model, a contact avoidance groove is opened at the middle position corresponding to the front and rear sides of the moving contact part. The contact avoidance groove can be used to prevent the static contact end of the static contact from coming into contact and cooperation with the middle position of the moving contact part, thereby changing the distribution position of the arc generated when the moving contact and the static contact are disconnected, so that the arc generation position is as much as possible away from the middle position where the moving contact and the static contact come into contact and cooperation. Furthermore, the arc is more concentrated in the positions closer to the front and rear side magnets, so as to use a stronger magnetic field to generate a blowing arc effect on the arc, thereby ensuring a good arc extinguishing effect. Description of the Drawings

[0019] Figure 1 It is a three-dimensional structural schematic diagram of the moving contact of the embodiment of the present utility model.

[0020] Figure 2 It is a three-dimensional structural schematic diagram of the static contact of the embodiment of the present utility model.

[0021] Figure 3It is the contact structure formed by the combination of two static contacts and a moving contact in an embodiment of the present utility model.

[0022] Figure 4 It is a schematic diagram of the magnetic field distribution when the moving contact in an embodiment of the present utility model is assembled with two arc extinguishing magnetic steels with equal magnetic forces.

[0023] Figure 5 It is a schematic diagram of the arc diffusion in an embodiment of the present utility model.

[0024] Figure 6 It is a schematic diagram of the magnetic field distribution when the moving contact in an embodiment of the present utility model is assembled with two arc extinguishing magnetic steels with unequal magnetic forces.

[0025] Label description:

[0026] 1. Moving contact body, 2. Static contact body, 3. Arc extinguishing magnetic steel, 11. Moving contact part, 12. Contact avoidance groove, 21. Static contact end, 22. Groove, 23. Oblique cutting surface. Specific implementation manners

[0027] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0028] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and 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 therefore should not be construed as a limitation to the present utility model.

[0029] Please refer to the attached Figure 1 to the attached Figure 5An embodiment of the utility model provides a moving contact, including a moving contact body 1, a moving contact portion 11 is formed at the left and right ends of the moving contact body 1, and a contact avoidance groove 12 is opened at the middle position of the front and rear sides corresponding to the two moving contact portions 11 to avoid contact with the center position of the static contact end 21 of the static contact. It can be understood that, in this embodiment, without changing the arrangement position of the original magnetic steel and the magnitude of the magnetic field strength, a different approach is taken by improving the structure of the moving contact, and opening a contact avoidance groove 12 at the middle position of the front and rear sides of the moving contact portion 11. The contact avoidance groove 12 can avoid the static contact end 21 of the static contact from contacting and matching with the middle position of the moving contact portion 11, thereby changing the distribution position of the arc generated when the moving contact and the static contact are disconnected, so that the arc generation position avoids the middle position of the contact and matching between the moving contact and the static contact as much as possible, and thus allows the arc to be more concentrated at positions closer to the front and rear magnetic steels, so as to utilize a stronger magnetic field to blow the arc, thereby ensuring a good arc extinguishing effect.

[0030] Please refer to the attached Figure 1 To Attachment Figure 5 In one preferred embodiment, one end of the contact avoidance groove 12 is located inside the moving contact portion 11, and the other end extends to the side end of the moving contact portion 11. The bottom of the contact avoidance groove 12 is open or closed. In this embodiment, preferably, the contact avoidance groove 12 runs through the upper and lower surfaces of the moving contact portion 11, so that the bottom of the contact avoidance groove 12 is open, and the contact avoidance groove 12 is a structure that is wide at the top and narrow at the bottom, which is conducive to arc drawing and has the effect of accelerating arc extinguishing.

[0031] Please refer to the attached Figure 1 To Attachment Figure 5, in a preferred embodiment, the moving contact is configured to be installed in the middle of two arc extinguishing magnets 3 inside the contactor. The "middle" here means approximately on the symmetric center line L1 of the two arc extinguishing magnets 3. Of course, in some usage scenarios, it is also allowed that the moving contact slightly deviates forward and backward within a certain range from the symmetric center line L1, and the polarities of the sides of the two arc extinguishing magnets 3 facing the moving contact are the same. In this embodiment, the magnetic forces of the two arc extinguishing magnets 3 are basically the same (due to processing precision issues, it is very difficult to process two arc extinguishing magnets with exactly the same magnetic force). In this embodiment, preferably, the contact avoidance grooves 12 of the two moving contact parts 11 are configured to be located on the symmetric center line L1 of the two arc extinguishing magnets 3 (the moving contact is a symmetric structure in the front-back direction along the width direction, and the moving contact is configured to be installed on the symmetric center line L1 of the two arc extinguishing magnets 3 inside the contactor). In some other embodiments, the magnetic forces of the two arc extinguishing magnets 3 may also be different. When the magnetic forces of the two arc extinguishing magnets 3 are different, the contact avoidance grooves 12 of the two moving contact parts 11 are configured to be located on the connecting line L2 of the magnetic force lines of the two arc extinguishing magnets 3. In addition, in this embodiment, preferably, the polarities of the sides of the two arc extinguishing magnets 3 facing the moving contact are both N poles. Taking the contact avoidance groove 12 as the middle dividing position, the parts of the moving contact part 11 close to the magnets 3 on its front and rear sides are defined as the first magnetic field region B1 and the third magnetic field region B3 respectively, and the middle part of the moving contact part 11 where the contact avoidance groove 12 is opened is the second magnetic field region B2. The magnetic field intensity of the first magnetic field region B1 or the third magnetic field region B3 is greater than the magnetic field intensity of the second magnetic field region B2. In this embodiment, through simulation verification, in the latter half part of the moving contact part 11 close to the rear arc extinguishing magnet 3, that is, the magnetic field intensity of the first magnetic field region B1 is 109.95 - 110.69 Mt, and in the front half part of the moving contact part 11 close to the front arc extinguishing magnet 3, that is, the magnetic field intensity of the third magnetic field region B3 is 115.38 - 115.7 mT (theoretically, the magnetic field intensities of the first magnetic field region B1 and the third magnetic field region B3 should be the same, but due to factors such as the processing precision of each component of the contactor product, the assembly precision, and the magnetic field size error of the two arc extinguishing magnets 3 themselves, there is a certain deviation in their magnetic field intensities). At the middle position corresponding to the front and rear sides of the moving contact part 11, that is, the magnetic field intensity of the second magnetic field region B2 where the contact avoidance groove 12 is opened is 68.2 - 69.4 mT. However, those skilled in the art should understand that in other embodiments, the polarities of the sides of the two arc extinguishing magnets 3 facing the moving contact can also be both S poles. In this embodiment, the two arc extinguishing magnets 3 are arranged oppositely along the width direction of the moving contact body 1 at both side positions of the moving contact body 1.

[0032] Please refer to the attached Figure 5 , in a preferred embodiment, the contact avoidance groove 12 forms an arc diffusion space that facilitates the diffusion and extinction of the arc.

[0033] Please refer to the attachedFigure 1 In one of the preferred embodiments, the moving contact is generally barbell-shaped, ensuring that after the contact avoidance groove is opened in the middle, the current-carrying area of ​​the front and rear parts will not be too small, and the front and rear sides of the middle position are recessed inward to form a groove structure. The two groove structures are used to limit the convex ribs inside the ceramic cover of the contactor to prevent rotation.

[0034] Please refer to the attached Figure 2 , Attachment Figure 5 One embodiment of the utility model further provides a static contact for use with the above-mentioned moving contact, including a static contact body 2, the lower end of the static contact body 2 forms a static contact end 21 and is arranged correspondingly to the moving contact portion 11 of the moving contact body 1. In this embodiment, preferably, a groove 22 corresponding to the contact avoidance groove 12 is provided on the end surface of the static contact end 21, and a chamfered surface 23 for lengthening the arc to improve the arc extinguishing effect is provided on the side surface of the static contact body 2. It can be understood that, in this embodiment, when the moving contact and the static contact form a conflicting match, since a groove 22 corresponding to the contact avoidance groove 12 is provided on the end surface of the static contact end 21, when the moving contact and the static contact are in conflicting match, the middle position of the two is actually not in conflict with each other, so that the arc generated when the moving contact and the static contact are disconnected can avoid the middle position of the moving contact and the static contact as much as possible, that is, avoid the second magnetic field area B2 with weaker magnetic field strength, so that the arc is more concentrated in the first magnetic field area B1 and the third magnetic field area B3 with relatively stronger magnetic field strength. In order to ensure a good arc blowing effect, so as to better achieve arc extinguishing.

[0035] Please refer to the attached Figure 1 To Attachment Figure 5 An embodiment of the utility model further provides a contact structure, comprising the moving contact described in any one of the above items and / or the stationary contact described in any one of the above items.

[0036] An embodiment of the utility model further provides a high-voltage DC contactor, comprising the above-mentioned contact structure.

[0037] As described above, the embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents. These modifications or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model. Therefore, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the protection scope of the utility model.

Claims

1. A moving contact, comprising a moving contact body (1), wherein two ends of the moving contact body (1) respectively form a moving contact portion (11), characterized in that: The two moving contact parts (11) are provided with contact avoidance grooves (12) for avoiding contact and matching with the center position of the static contact end (21) of the static contact.

2. The movable contact according to claim 1, characterized in that: The bottom of the contact avoidance groove (12) is open.

3. The movable contact according to claim 1, characterized in that: The bottom of the contact avoidance groove (12) is in a closed shape.

4. The movable contact according to claim 2, characterized in that: The contact avoidance groove (12) penetrates the upper and lower surfaces of the moving contact portion (11), so that the bottom of the contact avoidance groove (12) is open, and the contact avoidance groove (12) has a structure that is wide at the top and narrow at the bottom.

5. The moving contact according to claim 1, characterized in that: The moving contact is configured to be installed between two arc-extinguishing magnetic steels (3) inside the contactor, and the polarities of the two arc-extinguishing magnetic steels (3) facing the moving contact are the same.

6. The movable contact according to claim 5, characterized in that: When the magnetic forces of the two arc-extinguishing magnetic steels (3) are of the same magnitude, the contact avoidance grooves (12) of the two moving contact parts (11) are configured to be located on the symmetric center line L1 of the two arc-extinguishing magnetic steels (3), and when the magnetic forces of the two arc-extinguishing magnetic steels (3) are of different magnitude, the contact avoidance grooves (12) of the two moving contact parts (11) are configured to be located on the boundary connection line L2 of the magnetic force lines of the two arc-extinguishing magnetic steels (3).

7. The movable contact according to claim 5, characterized in that: The two arc-extinguishing magnetic steels (3) are arranged oppositely at two sides of the moving contact body (1) along the width direction of the moving contact body (1).

8. The movable contact according to claim 5, characterized in that: The polarity of the two arc-extinguishing magnetic steels (3) facing the moving contact is both N-pole, and the contact avoidance groove (12) is used as the middle separation position. The parts of the moving contact part (11) close to the magnetic steels (3) on the front and rear sides thereof are defined as the first magnetic field area B1 and the third magnetic field area B3, respectively, and the middle part of the moving contact part (11) provided with the contact avoidance groove (12) is defined as the second magnetic field area B2. The magnetic field intensity of the first magnetic field area B1 or the magnetic field intensity of the third magnetic field area B3 is greater than the magnetic field intensity of the second magnetic field area B2.

9. The movable contact according to claim 5, characterized in that: The contact avoidance groove (12) forms an arc diffusion space which facilitates the arc diffusion and extinguishing.

10. A stationary contact for use with the moving contact according to any one of claims 1 to 9, comprising a stationary contact body (2), the lower end of the stationary contact body (2) forming a stationary contact end (21) and arranged in correspondence with the moving contact portion (11) of the moving contact body (1) above and below.

11. The stationary contact according to claim 10, characterized in that: A groove (22) corresponding to the contact avoidance groove (12) is provided on the end surface of the static contact end (21), and a chamfered surface (23) for lengthening the arc so as to improve the arc extinguishing effect is provided on the side surface of the static contact body (2).

12. A contact structure, comprising the moving contact according to any one of claims 1 to 9 and / or the stationary contact according to claim 10 or 11.

13. A high-voltage direct current contactor, comprising the contact structure according to claim 12.

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