High-voltage direct current contactor

Abstract

The high-voltage direct-current contactor comprises a shell, an inner cover and two static contacts, the inner cover is arranged in the shell, one ends of the two static contacts are located in the inner cover, and the other ends of the two static contacts penetrate through the inner cover and the top wall of the shell to extend out of the shell for wiring; wherein the LED lamp further comprises a filling piece, the filling piece is made of an insulating material, and the filling piece is an independently-formed part; the filling piece comprises a main body part, two first through holes are formed in the main body part, the static contacts penetrate through the two first through holes respectively, the two first through holes are in clearance fit, and the other parts of the main body part except the first through holes are closed; the main body part is propped between the top wall of the shell and the inner cover; the method has the characteristic of improving the user experience.

Description

Technical Field

[0001] The present application relates to the low voltage electrical field and is a high voltage DC contactor. Background Art

[0002] With the continuous development of photovoltaics and new energy vehicles, the impact on switching electrical appliances is also huge.

[0003] As a control switch, high-voltage DC contactor has been developed rapidly.

[0004] The structure of the existing high-voltage DC contactor is disclosed in CN216435796U, which includes a shell, a ceramic inner support cover and a static contact. One end of the static contact passes through the ceramic inner support cover and the shell in turn for wiring, and epoxy resin is poured between the ceramic inner support cover and the shell.

[0005] The high-voltage DC contactor with the above structure has good sealing performance, but it also brings some problems due to the epoxy resin injection. When the epoxy resin solidifies, it will fit very tightly with the static contact, and the static contact is located at one end of the shell for wiring. When the user uses standard torque for wiring, the torque is easily transmitted to the epoxy resin and the static contact fitting part, causing the part to disengage, thereby generating abnormal noise. If the torque is continuously increased, it is easy to cause the terminal to disengage from the shell, causing abnormality at the user end and affecting customer use.

[0006] Therefore, how to provide high-voltage DC contactors with better user experience has become a direction worthy of research. Summary of the invention

[0007] In view of this, the purpose of this application is to overcome the deficiencies in the prior art and to provide a high-voltage DC contactor that can improve user experience.

[0008] The present application provides: a high-voltage DC contactor, comprising an outer shell, an inner cover and two stationary contacts, wherein the inner cover is arranged in the outer shell, one end of the two stationary contacts is in the inner cover, and the other end passes through the inner cover and the top wall of the outer shell and extends out of the outer shell for wiring; wherein, a filling piece is also included, the material of the filling piece is an insulating material, and the filling piece is an independently formed component; the filling piece includes a main body, the main body is provided with two first through holes, the two first through holes are respectively passed through by the stationary contacts, and there is a clearance fit between the two, and the rest of the main body except the first through holes is closed; the main body is supported between the top wall of the outer shell and the inner cover.

[0009] This structure is adopted, and a filler is used to replace the epoxy resin potting in the prior art. Since the static contact and the first through hole are clearance fit, the torque of the static contact during wiring is not easily transmitted to the filler, so the abnormal noise and shell detachment problems caused by excessive torque in the prior art will not occur. The clearance fit here is a kind of matching mode between holes and shafts in the mechanical field, which means that there is a gap between the two (including the situation where the minimum gap is equal to 0). In addition, the independently formed component here means that the filler is a component, and its molding has nothing to do with the outer shell and the inner cover, and it only needs to be assembled. Compared with the epoxy resin potting in the prior art, it improves the product assembly efficiency and reduces the cost.

[0010] In some embodiments of the present application, the orthographic projection of the main body on the upper surface of the inner cover completely covers the upper surface of the inner cover.

[0011] With this structure, the main body of the filling piece can cover the upper surface of the inner cover, thus achieving a certain protective effect.

[0012] In some embodiments of the present application, the filler further includes a partition portion, which is vertically arranged to the main body portion, and one end of the partition portion passes through the top wall of the housing and is located between the two static contacts.

[0013] The provision of the partition portion can effectively increase the creepage distance between the two static contacts.

[0014] In some embodiments of the present application, a first groove is formed on the inner cover, and the first groove is located between the two static contacts; and a first protrusion embedded in the first groove is formed on the lower surface of the main body.

[0015] The first groove and the first protrusion are arranged to further increase the creepage distance between the two static contacts.

[0016] In some embodiments of the present application, two second through holes are opened on the top wall of the shell, and the two second through holes correspond to the two first through holes respectively. A first annular protrusion surrounding the second through holes is arranged on the top wall of the shell, and the first annular protrusion is against the surface of the main body.

[0017] The arrangement of the first annular protrusion abutting against the surface of the main body can increase the sealing performance to a certain extent.

[0018] In some embodiments of the present application, two third through holes are provided on the inner cover, and a second annular protrusion surrounding the third through holes is provided on the upper surface of the inner cover; two second grooves are provided on the lower surface of the main body, and each second annular protrusion is embedded in the corresponding second groove.

[0019] The arrangement of the second annular protrusion and the second groove can further increase the creepage distance between the two static contacts.

[0020] In some embodiments of the present application, the filler is made of engineering plastic or rubber.

[0021] The filling parts can be made of engineering plastics or rubber. Rubber has better sealing performance, while engineering plastics are easier to process and shape. Both have their own advantages and disadvantages.

[0022] In some embodiments of the present application, the static contact includes a contact portion located inside the inner cover and a wiring portion located outside the inner cover, the cross-sectional area of ​​the wiring portion is larger than the cross-sectional area of ​​the contact portion; the hole wall of the first through hole is stepped, a portion of the wiring portion is in the first through hole, and the shape of the portion is consistent with the shape of the hole wall of the first through hole.

[0023] By adopting this structure, the tightness of the fit between the static contact and the main body can be further increased, and the creepage distance can also be effectively improved.

[0024] In some embodiments of the present application, the shell includes an outer cover and a cover, the bottom wall of the outer cover has an opening, and the main body is supported between the top wall of the outer cover and the inner cover; it also includes a drive assembly, and the inner cover is fixed to the upper end of the drive assembly; the cover is located between the opening and the outer cover and is fixed by a snap, and the cover is abutted against the lower end of the drive assembly, so that the main body is supported against the top wall of the outer cover and the inner cover in an interference fit.

[0025] With this structure, the buckle connection between the cover and the outer cover can be used to form an interference fit between the main body and the top wall of the outer cover and the inner cover, which can not only improve the connection strength and the overall sealing performance, but also compensate for the fit of the buckle through the interference fit, reduce the production accuracy of the outer cover and the cover, and improve the parts qualification rate and production efficiency.

[0026] In some embodiments of the present application, the cover includes a cover portion and an insertion portion located on both sides of the cover portion, the insertion portion extends in a direction away from the opening; a barb is provided on the outer surface of the insertion portion, and a slot is provided on the inner wall of the outer cover; there is a height difference between the barb and the cover portion.

[0027] This structure can make the outer cover and the cover fit more stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 An exploded view of a high voltage DC contactor of the present application is shown;

[0030] Figure 2 A cross-sectional view of a high voltage DC contactor of the present application is shown;

[0031] Figure 3 A cross-sectional view and a partial enlarged view of a stationary contact, an inner cover, and a filling piece in the high-voltage DC contactor of the present application are shown;

[0032] Figure 4 A schematic diagram of the structure of a filling piece in a high-voltage DC contactor of the present application is shown;

[0033] Figure 5 A schematic diagram of the structure of the outer cover in the high-voltage DC contactor of the present application is shown;

[0034] Figure 6 A schematic diagram showing the structure of a static contact in a high voltage DC contactor of the present application is shown;

[0035] Figure 7 A schematic structural diagram of an inner cover in a high-voltage DC contactor of the present application is shown. Implementation

[0036] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0037] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0039] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature. Example

[0041] like Figure 1-Figure 7 As shown, an embodiment of the present application is a high-voltage DC contactor.

[0042] The contactor comprises a housing, an inner cover 20 , a stationary contact 30 , a moving contact bridge 40 , a filling piece and a driving assembly 50 .

[0043] The housing includes an outer cover 11 and a cover 12. A second through hole 11b is provided on the top wall 11a of the outer cover 11 (that is, the top wall 11a of the housing), and the bottom wall of the outer cover 11 has an opening. The cover 12 is located at the opening and is fixed to the outer cover 11 by snaps to close the opening. The snap fixation here is specifically that the cover 12 includes a cover portion 12a and an insertion portion 12b, the insertion portion 12b is connected to both sides of the cover portion 12a, the insertion portion 12b extends in a direction away from the opening, a barb 12c is provided on the outer surface of the insertion portion 12b, and a card slot 11c is provided on the inner wall of the outer cover 11. Here, there is a height difference between the barb 12c and the cover portion 12a.

[0044] The driving assembly 50 includes an armature, a yoke, a bracket, a coil, a push rod assembly, etc. An electromagnet is formed between the coil, the yoke, and the armature, so that the push rod assembly forms a reciprocating motion, thereby connecting and disconnecting the moving contact bridge 40 and the static contact 30. Here, the driving assembly 50 is a conventional technical means in the art and will not be described in detail here.

[0045] The inner cover 20 is made of ceramic material and is welded to the bracket of the driving assembly 50. The moving contact bridge 40 is arranged inside the inner cover 20. The inner cover 20 is provided with two third through holes 20a for the static contacts 30 to pass through.

[0046] There are two static contacts 30. The static contacts 30 penetrate the inner cover 20 and the outer cover 11, and have a contact portion 31 located inside the inner cover 20 and a wiring portion 32 located outside the inner cover 20. Here, the contact portion 31 is used to cooperate with the moving contact bridge 40, and the wiring portion 32 is used to connect the external wire, and the cross-sectional area of ​​the wiring portion 32 is larger than the cross-sectional area of ​​the contact portion 31.

[0047] The filling piece includes a main body 61 and a partition 62. The main body 61 is held between the top wall 11a of the outer cover 11 and the upper surface of the inner cover 20. The holding here is an interference fit. Specifically, the inner cover 20 is welded to the drive assembly 50 to form a whole, and the cover 12 is abutted against the lower end of the drive assembly 50. Therefore, the cover 12 and the force abutting on the drive assembly 50 will be transmitted to the inner cover 20. As long as the thickness of the main body 61 is slightly larger than the gap between the outer cover 11 and the inner cover 20, an interference fit can be formed. Here, the main body 61 is provided with two first through holes 61a, and the two first through holes 61a are respectively passed through by the two static contacts 30, and there is a clearance fit between the static contacts 30 and the first through holes 61a. Except for the two first through holes 61a, the rest of the main body 61 is closed. The closed here means that there are no through holes in other places, only two first through holes 61a.

[0048] The orthographic projection of the main body 61 on the upper surface of the inner cover 20 completely covers the upper surface of the inner cover 20 , that is, the outer contour of the main body 61 is larger than the outer contour of the inner cover 20 , and the outer contour of the inner cover 20 is inside the outer contour of the main body 61 .

[0049] The partition portion 62 is vertically arranged with respect to the main body portion 61 , and the partition portion 62 passes through the top wall 11 a of the outer cover 11 and is located between the two stationary contacts 30 . Such a structural design can increase the creepage distance between the two stationary contacts 30 .

[0050] A first groove 20b is provided on the upper surface of the inner cover 20, and the first groove 20b is located between the two static contacts 30. A first protrusion 61c is provided on the lower surface of the main body 61, and the first protrusion 61c is embedded in the first groove 20b. This not only facilitates the assembly of the main body 61, but also can increase a certain creepage distance.

[0051] The top wall 11a of the outer cover 11 is provided with two first annular protrusions 61b toward the main body 61. The first annular protrusions 61b here are arranged around the second through hole 11b. The first annular protrusions 61b are abutted against the upper surface of the main body 61, which can improve the stability of the cooperation between the two and also improve a certain sealing performance.

[0052] Two second annular protrusions 20c are arranged on the upper surface of the inner cover 20, and the second annular protrusions 20c are arranged around the third through hole 20a. A second groove 61c is opened on the lower surface of the main body 61, and the second annular protrusions 20c are embedded in the second groove 61c, which can also increase the creepage distance to a certain extent.

[0053] In this embodiment, the hole wall of the first through hole 61a is stepped, a part of the wiring part 32 is in the first through hole 61a, and the shape of the part is consistent with the shape of the hole wall of the first through hole 61a. Specifically, the first through hole 61a has a larger aperture part 61a1 and a smaller aperture part 61a2, and there is a plane between the two to form a stepped shape, and a protrusion is provided on the lower surface of the wiring part 32, and the protrusion and the peripheral wall of the wiring part 32 are respectively attached to the smaller aperture part 61a2 and the larger aperture part 61a1.

[0054] There are many material options for fillers. It can be some materials with good toughness, such as engineering plastics, rubber, etc. There are many types of engineering plastics, for example, it can be PEEK (polyetheretherketone), PP (polypropylene), PE (polyethylene), PA (polyamide), etc.

[0055] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without contradiction.

[0056] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A high-voltage DC contactor, comprising an outer shell, an inner cover and two stationary contacts, wherein the inner cover is arranged in the outer shell, one end of the two stationary contacts is in the inner cover, and the other end passes through the inner cover and the top wall of the outer shell and extends out of the outer shell for wiring; characterized in that: It also includes a filling piece, which is made of insulating material and is an independently formed component; the filling piece includes a main body, which is provided with two first through holes, and the two first through holes are respectively passed through by the static contacts, with a clearance fit therebetween, and the rest of the main body except the first through holes is closed; the main body is supported between the top wall of the outer shell and the inner cover.

2. A high voltage DC contactor according to claim 1, characterized in that: The orthographic projection of the main body on the upper surface of the inner cover completely covers the upper surface of the inner cover.

3. A high voltage DC contactor according to claim 1, characterized in that: The filling piece also includes a partition part, which is arranged vertically with the main body part, and one end of the partition part passes through the top wall of the shell and is located between the two static contacts.

4. A high voltage DC contactor according to claim 1, characterized in that: The inner cover is provided with a first groove, and the first groove is located between the two stationary contacts; the lower surface of the main body is provided with a first protrusion embedded in the first groove.

5. A high voltage DC contactor according to claim 1, characterized in that: The top wall of the shell is provided with two second through holes, the two second through holes respectively corresponding to the two first through holes, the top wall of the shell is provided with a first annular protrusion surrounding the second through holes, and the first annular protrusion abuts against the surface of the main body.

6. A high voltage DC contactor according to claim 1, characterized in that: The inner cover is provided with two third through holes, and the upper surface of the inner cover is provided with a second annular protrusion surrounding the third through holes; the lower surface of the main body is provided with two second grooves, and each second annular protrusion is embedded in the corresponding second groove.

7. A high voltage DC contactor according to claim 1, characterized in that: The material of the filling piece is engineering plastic or rubber.

8. A high voltage DC contactor according to claim 1, characterized in that: The static contact includes a contact portion located inside the inner cover and a wiring portion located outside the inner cover, the cross-sectional area of ​​the wiring portion is larger than the cross-sectional area of ​​the contact portion; the hole wall of the first through hole is stepped, a portion of the wiring portion is in the first through hole, and the shape of the portion is consistent with the shape of the hole wall of the first through hole.

9. A high voltage DC contactor according to claim 1, characterized in that: The shell includes an outer cover and a cover, the bottom wall of the outer cover has an opening, and the main body is supported between the top wall of the outer cover and the inner cover; it also includes a driving assembly, and the inner cover is welded to the upper end of the driving assembly; the cover is located between the opening and the outer cover and is fixed by snapping, and the cover is abutted against the lower end of the driving assembly, so that the main body is supported against the top wall of the outer cover and the inner cover in an interference fit.

10. A high voltage DC contactor according to claim 9, characterized in that: The cover includes a cover plate portion and an insertion portion located on both sides of the cover plate portion, wherein the insertion portion extends in a direction away from the opening; a barb is arranged on the outer surface of the insertion portion, and a slot is arranged on the inner wall of the outer cover; and there is a height difference between the barb and the cover plate portion.

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