Contact mechanism, direct current contactor and distribution box

Abstract

The utility model discloses a contact mechanism, a direct current contactor and a distribution box, and relates to the technical field of electric appliance switches. The contact mechanism comprises a moving contact assembly and a static contact assembly, the moving contact assembly is in contact with or separated from the static contact assembly to enable the direct current contactor to be connected or disconnected, the static contact assembly comprises two parallel static contacts arranged at intervals, the moving contact assembly comprises at least two parallel moving contacts, and the moving contacts are in contact with the static contacts. The moving contact extends along the direction of a connecting line of the two static contacts, and two opposite ends of the moving contact are respectively arranged corresponding to the two static contacts. The direct current contactor comprises the contact mechanism. The distribution box comprises the DC contactor. According to the contact mechanism, the direct current contactor and the distribution box, the problem of relatively large electric repulsive force between the movable contact and the static contact caused by the influence of a magnetic field generated by large current can be solved, and the stability and the safety of a product are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical switches, in particular to a contact mechanism, a DC contactor and a distribution box. Background Art

[0002] A DC contactor is a contactor used in a DC circuit, mainly used to control DC circuits, such as the main circuit, control circuit, and excitation circuit.

[0003] With the rapid development of rail transit, the demand for DC contactors in rail transit systems is increasing. Therefore, the design requirements for DC contactor products are high voltage, high current, small size and low cost.

[0004] Affected by the magnetic field generated by large current, a large electric repulsion force will be generated between the moving contact and the static contact, which may easily cause the contacts to be repelled and lead to continuous arcing, which may cause the product's welding to fail at the least and may even cause the product to explode at the worst. Utility Model Content

[0005] The utility model aims to provide a contact mechanism, a DC contactor and a distribution box, which can solve the problem of large electric repulsion between moving and static contacts caused by the influence of the magnetic field generated by large current, and improve the stability and safety of the product.

[0006] The embodiment of the utility model is achieved as follows:

[0007] The first aspect of the embodiment of the utility model provides a contact mechanism, including a moving contact assembly and a stationary contact assembly, wherein the moving contact assembly contacts or separates from the stationary contact assembly to connect or disconnect the DC contactor, wherein the stationary contact assembly includes two stationary contacts arranged in parallel and at intervals, and the moving contact assembly includes at least two moving contacts connected in parallel, wherein the moving contact extends along the connecting direction of the two stationary contacts, and the opposite ends of the moving contact are respectively arranged corresponding to the two stationary contacts. The contact mechanism can solve the problem of large electric repulsion between the moving and stationary contacts caused by the magnetic field generated by large current, and improve the stability and safety of the product.

[0008] Optionally, the moving contact includes two contact segments and a connecting segment connected between the two contact segments, the two contact segments correspond one-to-one to the two static contacts, a protrusion is provided on the side wall of the connecting segment, the protrusions of two adjacent moving contacts are arranged opposite to each other, and there is a gap between the contact segments of two adjacent moving contacts.

[0009] Optionally, the protrusion is located at a middle position of the connecting section along the extending direction of the moving contact, and the number of the protrusion is at least one.

[0010] Optionally, it also includes a push rod, a mounting seat, a fixed cover, a contact spring and a magnetic component, the mounting seat is fixed on the push rod, the fixed cover and the mounting seat are interlocked to form a mounting cavity, the contact spring and the magnetic component are respectively accommodated in the mounting cavity, the opposite ends of the contact spring are respectively abutted against the mounting seat and the magnetic component, the side of the magnetic component away from the contact spring is abutted against the fixed cover, and the moving contact is floatingly installed in the magnetic component.

[0011] Optionally, an arcuate convex rib is provided on a side of the moving contact away from the static contact, the arcuate convex rib is located in the middle of the moving contact along the extension direction of the moving contact, and the extension direction of the arcuate convex rib is perpendicular to the extension direction of the moving contact.

[0012] Optionally, the magnetic assembly includes a U-shaped magnetic block and a plate-shaped magnetic block, the moving contact is installed in a cavity of the U-shaped magnetic block, and the plate-shaped magnetic block covers the U-shaped magnetic block to close the cavity of the U-shaped magnetic block.

[0013] Optionally, a first positioning portion is provided on the top surface of the mounting seat, a second positioning portion is provided on the bottom surface of the U-shaped magnetic block, and opposite ends of the contact spring are positioned and mounted on the first positioning portion and the second positioning portion, respectively.

[0014] Optionally, the mounting seat and the fixing cover are both U-shaped structures, and the two folding arms of the mounting seat are respectively provided with a first clamping portion, and the two folding arms of the fixing cover are respectively provided with a second clamping portion, and the first clamping portion and the second clamping portion are clamped with each other to clamp and fix the mounting seat and the fixing cover.

[0015] The second aspect of the embodiment of the utility model provides a DC contactor, comprising the above-mentioned contact mechanism. The contact mechanism can solve the problem of large electric repulsion between the moving and static contacts caused by the magnetic field generated by large current, and improve the stability and safety of the product.

[0016] The third aspect of the embodiment of the utility model provides a distribution box, comprising the above-mentioned DC contactor. The contact mechanism can solve the problem of large electric repulsion between the moving and static contacts caused by the magnetic field generated by large current, thereby improving the stability and safety of the product.

[0017] The beneficial effects of the embodiments of the utility model include:

[0018] The contact mechanism includes a moving contact assembly and a stationary contact assembly. The moving contact assembly contacts or separates from the stationary contact assembly to connect or disconnect the DC contactor. The stationary contact assembly includes two stationary contacts arranged in parallel and at intervals. The moving contact assembly includes at least two moving contacts connected in parallel. The moving contact extends along the connecting direction of the two stationary contacts. The opposite ends of the moving contact are respectively arranged corresponding to the two stationary contacts. In this way, it can be ensured that the opposite ends of the multiple moving contacts of the moving contact assembly can respectively contact and connect with the two stationary contacts of the stationary contact assembly or separate and disconnect. Since current shunting can be achieved by parallel connection, compared with the structural design of the single-piece moving contact in the prior art, the contact mechanism provided by the present application adopts a structural design of at least two parallel moving contacts, and the electric repulsion between the moving contact assembly and the stationary contact assembly is reduced by increasing the number of conductive paths, thereby avoiding the phenomenon of contact welding caused by the influence of the magnetic field generated by the large current, thereby improving the stability and safety of the DC contactor provided with the contact mechanism provided by the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, 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 utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the structure of the contact mechanism provided by the embodiment of the utility model;

[0021] Figure 2 An exploded schematic diagram of a contact mechanism provided by an embodiment of the utility model;

[0022] Figure 3 A schematic diagram of the structure of a moving contact provided in an embodiment of the utility model;

[0023] Figure 4 A schematic diagram of the structure of a U-shaped magnetic block provided in an embodiment of the utility model;

[0024] Figure 5 A schematic diagram of the structure of a mounting base provided in an embodiment of the utility model;

[0025] Figure 6 A schematic structural diagram of a fixed cover provided in an embodiment of the utility model.

[0026] Icons: 100-contact mechanism; 10-moving contact assembly; 11-moving contact; 111-contact section; 112-connecting section; 1121-protrusion; 1122-arc-shaped rib; 20-stationary contact assembly; 21-stationary contact; 30-push rod; 40-mounting seat; 41-first positioning portion; 42-first clamping portion; 50-fixing cover; 51-second clamping portion; 60-contact spring; 70-magnetic assembly; 71-U-shaped magnetic block; 711-second positioning portion; 72-plate-type magnetic block. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0031] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0032] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] Please refer to Figures 1 to 6 The embodiment of the present application provides a contact mechanism 100, including a moving contact assembly 10 and a stationary contact assembly 20. The moving contact assembly 10 contacts or separates from the stationary contact assembly 20 to connect or disconnect the DC contactor. The stationary contact assembly 20 includes two stationary contacts 21 arranged in parallel and at intervals. The moving contact assembly 10 includes at least two moving contacts 11 connected in parallel. The moving contact 11 extends along the connecting direction of the two stationary contacts 21. The opposite ends of the moving contact 11 are respectively arranged corresponding to the two stationary contacts 21. The contact mechanism 100 can solve the problem of large electric repulsion between the moving and stationary contacts 21 caused by the magnetic field generated by large current, and improve the stability and safety of the product.

[0034] It should be noted that if Figure 1 and Figure 2 As shown, the contact mechanism 100 includes a moving contact assembly 10 and a stationary contact assembly 20, wherein when the moving contact assembly 10 moves toward a side close to the stationary contact assembly 20, the moving contact assembly 10 can be brought into contact with the stationary contact assembly 20, thereby enabling the DC contactor to connect to the common power circuit; when the moving contact assembly 10 moves toward a side away from the stationary contact assembly 20, the moving contact assembly 10 can be separated from the stationary contact assembly 20, thereby enabling the DC contactor to disconnect the power circuit.

[0035] Specifically, Figure 1 and Figure 2 As shown, the static contact assembly 20 includes two static contacts 21 arranged in parallel and at intervals, and the moving contact assembly 10 includes at least two moving contacts 11 connected in parallel, and the moving contact 11 extends along the connecting direction of the two static contacts 21, and the opposite ends of the moving contact 11 are respectively arranged corresponding to the two static contacts 21, thereby ensuring that the opposite ends of the multiple moving contacts 11 of the moving contact assembly 10 can respectively contact and conduct or separate and disconnect with the two static contacts 21 of the static contact assembly 20. Since current can be shunted by parallel connection, in this embodiment, the electric repulsion between the moving contact assembly 10 and the static contact assembly 20 can be reduced by the moving contact assembly 10 including at least two moving contacts 11 connected in parallel.

[0036] Compared with the structural design of the single-piece moving contact in the prior art, the contact mechanism 100 provided in the present application adopts a structural design of at least two parallel moving contacts 11, and reduces the electric repulsion between the moving contact assembly 10 and the stationary contact assembly 20 by increasing the number of conductive paths, thereby avoiding the phenomenon of contact welding caused by the influence of the magnetic field generated by the large current, thereby improving the stability and safety of the DC contactor provided with the contact mechanism 100 provided in the present application.

[0037] Alternatively, if Figure 3 As shown, the moving contact 11 includes two contact segments 111 and a connecting segment 112 connected between the two contact segments 111. The two contact segments 111 correspond to the two stationary contacts 21 one by one. A protrusion 1121 is provided on the side wall of the connecting segment 112. The protrusions 1121 of two adjacent moving contacts 11 are arranged opposite to each other to ensure that there is a gap between the contact segments 111 of the two adjacent moving contacts 11, thereby improving the anti-welding performance of the moving contact 11. It should be understood that the larger the above gap, the better the anti-welding performance of the moving contact 11.

[0038] Alternatively, if Figure 3 As shown, the protrusion 1121 is located at the middle position of the connecting section 112 along the extension direction of the moving contact 11, and the number of the protrusion 1121 is at least one. By way of example, in this embodiment, the number of the protrusions 1121 is two. When the number of the moving contacts 11 is three or more, the protrusions 1121 are provided on opposite sides of the connecting section 112, and the protrusions 1121 of two adjacent moving contacts 11 are arranged opposite to each other to ensure that there is a gap between the contact sections 111 of the two adjacent moving contacts 11.

[0039] Alternatively, if Figure 1 and Figure 2 As shown, the contact mechanism 100 also includes a push rod 30, a mounting seat 40, a fixed cover 50, a contact spring 60 and a magnetic component 70. The mounting seat 40 is fixed on the push rod 30. The fixed cover 50 and the mounting seat 40 are interlocked to form a mounting cavity. The contact spring 60 and the magnetic component 70 are respectively accommodated in the mounting cavity. The opposite ends of the contact spring 60 are respectively abutted against the mounting seat 40 and the magnetic component 70. The side of the magnetic component 70 away from the contact spring 60 is abutted against the fixed cover 50. The moving contact 11 is floatingly installed in the magnetic component 70.

[0040] It should be noted that if Figure 1 and Figure 2As shown, in actual use, the driving push rod 30 moves toward the side close to the static contact 21, which can drive the mounting seat 40 to move synchronously toward the side close to the static contact 21. When the moving contact 11 and the static contact 21 begin to contact, the static contact 21 will generate pressure on the moving contact 11 and squeeze the contact spring 60 through the magnetic component 70. At this time, the push rod 30 can continue to move toward the side close to the static contact 21 until the contact spring 60 is squeezed to the maximum compression amount. The contact spring 60 will continuously accumulate elastic potential energy during the squeezing process, so that the contact spring 60 has a movement tendency to restore to the initial shape, so that the moving contact 11 can be always pressed against the static contact 21 through the contact spring 60, thereby ensuring that the moving contact 11 is in close contact with the static contact 21. Since the moving contact 11 is floatingly installed in the magnetic component 70, under the action of the contact spring 60, the opposite ends of multiple moving contacts 11 can be in close contact with the corresponding static contact 21.

[0041] Alternatively, if Figure 3 As shown, an arcuate rib 1122 is provided on one side of the moving contact 11 away from the static contact 21 . The arcuate rib 1122 is located in the middle of the moving contact 11 along the extension direction of the moving contact 11 , and the extension direction of the arcuate rib 1122 is perpendicular to the extension direction of the moving contact 11 .

[0042] It should be noted that an arc-shaped rib 1122 is provided on the side of the moving contact 11 away from the static contact 21. The contact point between the arc-shaped rib 1122 and the magnetic component 70, that is, the support point for the relative movement between the moving contact 11 and the magnetic component 70, can make the moving contact 11 float within a certain range relative to the magnetic component 70 with the contact point as the support point (similar to the floating of a seesaw relative to the ground), thereby changing the horizontal heights of the relative ends of the moving contact 11, and further ensuring that the relative ends of multiple moving contacts 11 can be in close contact with the corresponding static contact 21 under the action of the contact spring 60.

[0043] Alternatively, if Figure 1 and Figure 2 As shown, the magnetic assembly 70 includes a U-shaped magnetic block 71 and a plate-shaped magnetic block 72 . The moving contact assembly 10 is installed in the cavity of the U-shaped magnetic block 71 . The plate-shaped magnetic block 72 covers the U-shaped magnetic block 71 to close the cavity of the U-shaped magnetic block 71 .

[0044] It should be noted that if Figure 1 and Figure 2As shown, in the present embodiment, the magnetic assembly 70 includes a U-shaped magnetic block 71 and a plate-shaped magnetic block 72, wherein the U-shaped magnetic block 71 is a semi-closed structure. Thus, in the actual installation process, the moving contact 11 can be first installed in the cavity of the U-shaped magnetic block 71, and then the plate-shaped magnetic block 72 can be covered on the U-shaped magnetic block to seal the U-shaped magnetic block 71 through the plate-shaped magnetic block 72, thereby making the moving contact 11 in the magnetic field provided by the magnetic assembly 70, and can also be easily disassembled and assembled.

[0045] Alternatively, if Figure 4 and Figure 5 As shown, a first positioning portion 41 is disposed on the top surface of the mounting seat 40 , a second positioning portion 711 is disposed on the bottom surface of the U-shaped magnetic block 71 , and opposite ends of the contact spring 60 are positioned and mounted on the first positioning portion 41 and the second positioning portion 711 , respectively.

[0046] It should be noted that in order to position the contact spring 60 for installation and guide the movement of the contact spring 60, as shown in FIG. Figure 4 and Figure 5 As shown, in this embodiment, the top surface of the mounting seat 40 is provided with a first positioning portion 41, the bottom surface of the U-shaped magnetic block 71 is provided with a second positioning portion 711, and the opposite ends of the contact spring 60 are respectively positioned and installed on the first positioning portion 41 and the second positioning portion 711, so that the contact spring 60 can perform telescopic movement along the connecting direction of the first positioning portion 41 and the second positioning portion 711. For example, in this embodiment, the first positioning portion 41 is a boss, and the second positioning portion 711 is a groove. Of course, in other embodiments, the first positioning portion 41 can also be a groove, and the second positioning portion 711 can be a boss.

[0047] Alternatively, if Figure 5 and Figure 6 As shown, the mounting seat 40 and the fixing cover 50 are both U-shaped structures, and the first clamping parts 42 are respectively provided on the two folding arms of the mounting seat 40, and the second clamping parts 51 are respectively provided on the two folding arms of the fixing cover 50. The first clamping parts 42 and the second clamping parts 51 are clamped with each other to clamp and fix the mounting seat 40 and the fixing cover 50.

[0048] It should be noted that if Figure 5 and Figure 6As shown, in this embodiment, the mounting seat 40 and the fixing cover 50 are both U-shaped structures, wherein the openings of the mounting seat 40 and the fixing cover 50 are arranged opposite to each other so that the mounting seat 40 and the fixing cover 50 can be buckled together to form a mounting cavity, and the two folding arms of the mounting seat 40 are respectively provided with a first clamping portion 42, and the two folding arms of the fixing cover 50 are respectively provided with a second clamping portion 51, thereby, in the actual installation process, the first clamping portion 42 and the second clamping portion 51 can be mutually clamped to achieve the clamping fixation of the mounting seat 40 and the fixing cover 50. For example, in this embodiment, the first clamping portion 42 is a clamping platform, and the second clamping portion 51 is a clamping groove. Of course, in other embodiments, the first clamping portion 42 can also be a clamping groove, and the second clamping portion 51 can also be a clamping platform.

[0049] The embodiment of the present application further provides a DC contactor, comprising the above-mentioned contact mechanism 100. Since the structure and beneficial effects of the contact mechanism 100 have been described in detail in the above-mentioned embodiment, they will not be described in detail here.

[0050] The embodiment of the present application further provides a power distribution box, comprising the above-mentioned DC contactor. Since the structure and beneficial effects of the DC contactor have been described in detail in the above-mentioned embodiment, they will not be described in detail here.

[0051] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

[0052] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present utility model will not further describe various possible combinations.

Claims

1. A contact mechanism, characterized in that: The invention comprises a moving contact assembly (10) and a stationary contact assembly (20), wherein the moving contact assembly (10) contacts or separates from the stationary contact assembly (20) to connect or disconnect a DC contactor, wherein the stationary contact assembly (20) comprises two stationary contacts (21) arranged in parallel and at intervals, and wherein the moving contact assembly (10) comprises at least two moving contacts (11) connected in parallel, wherein the moving contact (11) extends in the direction of a line connecting the two stationary contacts (21), and wherein opposite ends of the moving contact (11) are respectively arranged corresponding to the two stationary contacts (21).

2. The contact mechanism according to claim 1, characterized in that: The moving contact (11) comprises two contact segments (111) and a connecting segment (112) connected between the two contact segments (111); the two contact segments (111) correspond to the two stationary contacts (21) one by one; a protrusion (1121) is provided on the side wall of the connecting segment (112); the protrusions (1121) of two adjacent moving contacts (11) are arranged opposite to each other, and a gap is provided between the contact segments (111) of two adjacent moving contacts (11).

3. The contact mechanism according to claim 2, characterized in that: The protrusion (1121) is located at a middle position of the connecting section (112) along the extending direction of the moving contact (11), and the number of the protrusion (1121) is at least one.

4. The contact mechanism according to claim 1, characterized in that: It also includes a push rod (30), a mounting seat (40), a fixed cover (50), a contact spring (60) and a magnetic component (70), wherein the mounting seat (40) is fixed on the push rod (30), the fixed cover (50) and the mounting seat (40) are interlocked to form a mounting cavity, the contact spring (60) and the magnetic component (70) are respectively accommodated in the mounting cavity, the opposite ends of the contact spring (60) are respectively abutted against the mounting seat (40) and the magnetic component (70), the side of the magnetic component (70) away from the contact spring (60) is abutted against the fixed cover (50), and the moving contact (11) is floatingly installed in the magnetic component (70).

5. The contact mechanism according to claim 4, characterized in that: An arc-shaped convex rib (1122) is provided on a side of the moving contact (11) away from the stationary contact (21); the arc-shaped convex rib (1122) is located in the middle of the moving contact (11) along the extension direction of the moving contact (11); and the extension direction of the arc-shaped convex rib (1122) is perpendicular to the extension direction of the moving contact (11).

6. The contact mechanism according to claim 4, characterized in that: The magnetic assembly (70) comprises a U-shaped magnetic block (71) and a plate-shaped magnetic block (72); the moving contact (11) is installed in the cavity of the U-shaped magnetic block (71); and the plate-shaped magnetic block (72) covers the U-shaped magnetic block (71) to close the cavity of the U-shaped magnetic block (71).

7. The contact mechanism according to claim 6, characterized in that: The top surface of the mounting seat (40) is provided with a first positioning portion (41), the bottom surface of the U-shaped magnetic block (71) is provided with a second positioning portion (711), and the opposite ends of the contact spring (60) are respectively positioned and mounted on the first positioning portion (41) and the second positioning portion (711).

8. The contact mechanism according to claim 4, characterized in that: The mounting seat (40) and the fixing cover (50) are both U-shaped structures; the two folding arms of the mounting seat (40) are respectively provided with a first clamping portion (42); the two folding arms of the fixing cover (50) are respectively provided with a second clamping portion (51); the first clamping portion (42) and the second clamping portion (51) are mutually clamped, so that the mounting seat (40) and the fixing cover (50) are clamped and fixed.

9. A DC contactor, characterized in that: It comprises the contact mechanism (100) according to any one of claims 1 to 8.

10. A distribution box, characterized in that: Including the DC contactor as described in claim 9.

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