High-voltage direct-current contactor with double exhaust pipes

Abstract

The utility model discloses a high-voltage direct current contactor with double exhaust pipes, which comprises a shell and a contact system, a sealing cavity is arranged in the shell, the contact system comprises a binding post and a movable contact plate, the binding post is fixedly connected with the shell, one end of the binding post extends into the sealing cavity, the movable contact plate is movably arranged in the sealing cavity, and the binding post and the movable contact plate are oppositely arranged. The movable contact plate can be close to or away from the binding post under the action of external force; the shell is provided with an air inlet pipe and an air outlet pipe, the air inlet pipe and the air outlet pipe both extend into the sealing cavity in the shell, other parts can enter the sealing cavity through the air inlet pipe, and air in the sealing cavity can be exhausted through the air outlet pipe. By means of the arrangement, in the air inflation process of the contactor, the contactor can run in the contactor through the double-air-pipe structure to form an air flow group moving at a high speed, impurities in the contactor are discharged from the air outlet pipe although the air flow exists, the air inflation efficiency of the contactor is improved, and the qualification rate of the contactor is increased.

Description

Technical Field

[0001] The utility model relates to the field of contactors, in particular to a high-voltage DC contactor with double exhaust pipes. Background Art

[0002] In the prior art, the exhaust pipe of the high-voltage DC contactor is single. The method for removing foreign matters is to place the product in a large sealed box and then evacuate the sealed box.

[0003] The prior art with the publication number of CN207038439U discloses a DC contactor with an air pipe sealing protection, which includes a support with an open cavity, a fixed iron cup inside the cavity of the support. The iron cup is cup-shaped with an opening at the upper end. A moving contact, an iron core, and a moving shaft 16 are placed inside the cavity of the iron cup. The iron core at the lower end of the moving shaft 16 and the moving contact at the upper end of the moving shaft 16 are connected through the moving shaft 16. The inner support frame has a cavity with an opening at the lower end. Two lead columns pass through the upper through holes of the support frame so that the static contact at the lower end of the wiring column is located inside the iron cup. The upper end of the support, the port of the iron cup, and the upper end of the inner support frame are sealed with epoxy resin as a sealing material to form a sealing layer. The sealing layer and the iron cup form a sealed cavity. There is a fixing plate at the upper end of the sealing layer. There is a cylindrical protection structure at the upper end of the fixing plate. The protection structure and the fixing plate are integrally injection-molded. A copper air pipe is arranged inside the protection structure. The air pipe penetrates through the fixing plate, the sealing layer, and the inner support frame and is connected to the sealed cavity. The upper end port of the air pipe is covered with a sealing cover. The lower end of the sealing cover is bonded to the fixing plate. The sealed cavity is filled with inert gas.

[0004] In the prior art, only one air pipe is provided on the contactor. When there are foreign matters inside the product, the foreign matters inside the product are sucked out together with the air through the exhaust pipe. There is a drawback in this method of removing foreign matters, that is, the foreign matters will be attached to the surface of the components and cannot be discharged. Therefore, it will affect the reliability of the product when powered on. Content of the Utility Model

[0005] In order to solve the problem that the reliability of the contactor is reduced due to the existence of foreign matters inside the contactor in the prior art, the purpose of the utility model is to provide a high-voltage DC contactor with double exhaust pipes, which forms a high-speed air flow inside the contactor during charging and discharging through a double-pipe structure, thereby discharging the impurities inside the contactor and improving the reliability of the contactor.

[0006] To achieve the above object, the utility model adopts the following technical solutions: A high-voltage DC contactor with double exhaust pipes, including a housing and a contact system. A sealed cavity is arranged inside the housing. The contact system includes a terminal and a moving contact plate. The terminal is fixedly connected to the housing. One end of the terminal extends into the sealed cavity. The moving contact plate is movably arranged in the sealed cavity. The terminal and the moving contact plate are arranged opposite to each other. The moving contact plate can be close to or away from the terminal under the action of an external force. An intake pipe and an exhaust pipe are arranged on the housing. Both the intake pipe and the exhaust pipe extend into the sealed cavity inside the housing. Other substances can enter the sealed cavity through the intake pipe, and the gas in the sealed cavity can be discharged through the exhaust pipe.

[0007] Preferably, both the intake pipe and the exhaust pipe are copper pipes.

[0008] Preferably, both the intake pipe and the exhaust pipe can be clamped by a pipe wrench.

[0009] Preferably, the housing includes an iron cup. A sealing layer is arranged at the opening of the iron cup. The iron cup and the sealing layer cooperate to form a sealed cavity.

[0010] Preferably, the material of the sealing layer is epoxy resin.

[0011] Preferably, the housing further includes an outer shell. An upward opening is arranged on the outer shell. The iron cup is located inside the opening of the outer shell. The sealing layer fixes the iron cup inside the outer shell.

[0012] Preferably, an upper bracket and a lower bracket are arranged in the sealed cavity. The iron core is installed on the lower bracket through a bearing. A moving shaft penetrates through the iron core and the moving contact plate. The moving shaft is slidably matched with the iron core and the moving contact plate.

[0013] Preferably, retaining rings are arranged at both ends of the moving shaft. The moving contact plate and the iron core are arranged between the two retaining rings. A first spring is arranged between the upper bracket and the moving shaft plate. A second spring is arranged between the first bracket and the iron core.

[0014] Preferably, a coil is wound on the lower bracket. The iron core is located inside the coil.

[0015] Preferably, the terminal includes a connecting part and a static contact. The static contact is arranged inside the sealed cavity. The connecting part is located outside the housing.

[0016] The beneficial effect of the technical solution of the utility model is that when the contactor is inflated, a high-speed moving air flow group can be formed inside the contactor through the structure of the double pipes. Then, the impurities inside the contactor are discharged from the exhaust pipe along with the air flow, and at the same time, the air is prevented from being re-introduced into the contactor, making the purity of the internal inert gas higher and the characteristics of the product more stable and reliable. When using double pipes, the inflation efficiency of filling inert gas into the contactor can be improved. The time required for a single exhaust pipe is approximately 3 - 4 minutes, and the time for a double exhaust pipe is approximately 1 minute, and the efficiency is increased by 3 - 4 times. Description of the Drawings

[0017] Figure 1 It is a schematic structure diagram of a contactor Figure 1 ;

[0018] Figure 2 It is a schematic structure diagram of a contactor Figure 2 。

[0019] Reference numerals in the drawings: 1, housing; 2, iron cup; 3, upper bracket; 4, sealing layer; 5, terminal; 6, moving contact plate; 7, intake pipe; 8, exhaust pipe; 9, bearing; 11, first spring; 12, sealing cavity; 13, iron core; 14, lower bracket; 15, second spring; 16, moving shaft. Detailed Description of the Preferred Embodiment

[0020] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, and do 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 thus should not be construed as limiting the present invention.

[0022] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more, unless otherwise clearly defined.

[0023] In the present utility model, unless otherwise clearly specified or limited, terms such as "installation", "connection", "linkage", "fixation" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0024] In the present utility model, unless otherwise clearly specified or limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on the top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath" and "under the bottom of" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0025] Embodiment 1

[0026] As Figure 1 and Figure 2 shown, a high-voltage DC contactor with double exhaust pipes includes a housing and a contact system. A sealed cavity is arranged inside the housing. The contact system includes a terminal 5 and a moving contact plate 6. The terminal 5 is fixedly connected to the housing. One end of the terminal 5 extends into the sealed cavity 12. The moving contact plate 6 is movably installed in the sealed cavity 12. The terminal 5 and the moving contact plate 6 are arranged oppositely. The moving contact plate 6 can approach or move away from the terminal 5 under the action of an external force.

[0027] An air inlet pipe 7 and an air outlet pipe 8 are arranged on the housing. Both the air inlet pipe 7 and the air outlet pipe 8 extend into the sealed cavity 12 inside the housing. Other substances can enter the sealed cavity 12 through the air inlet pipe 7, and the gas inside the sealed cavity 12 can be discharged through the air outlet pipe 8.

[0028] With such an arrangement, during the inflation process of the contactor, a high-speed moving air flow group can be formed inside the contactor through the structure of the double pipes. Thereby, the impurities inside the contactor can be discharged through the air outlet pipe along with the air flow, and at the same time, the air is prevented from being re-introduced into the contactor, making the purity of the internal inert gas higher and the characteristics of the product more stable and reliable. When using double pipes, the inflation efficiency of filling inert gas into the contactor can be improved. It takes about 3 - 4 minutes for a single air outlet pipe, while it takes about 1 minute for a double exhaust pipe, and the efficiency is increased by 3 - 4 times.

[0029] In this embodiment, both the air inlet pipe 7 and the air outlet pipe 8 are copper pipes.

[0030] In this embodiment, both the intake pipe 7 and the exhaust pipe 8 can be clamped and sealed by a pipe wrench.

[0031] In this embodiment, the housing includes an iron cup 2, a sealing layer 4 is provided at the opening of the iron cup 2, and the iron cup 2 and the sealing layer 4 cooperate to form a sealed cavity 12.

[0032] Further preferably, the material of the sealing layer 4 is epoxy resin.

[0033] In this embodiment, the housing further includes an outer shell 1, an upward opening is provided on the outer shell 1, the iron cup 2 is located within the opening of the outer shell 1, and the sealing layer 4 fixes the iron cup 2 within the outer shell 1.

[0034] In this embodiment, an upper bracket 3 and a lower bracket 14 are provided within the sealed cavity 12, the iron core 13 is mounted on the lower bracket 14 through a bearing 9, the moving shaft 16 passes through the iron core 13 and the moving contact plate 6, and the moving shaft 16 is in sliding fit with the iron core 13 and the moving contact plate 6. Further preferably, the bearing 9 is an oil-free bearing 9.

[0035] In this embodiment, retaining rings are provided at both ends of the moving shaft 16, the moving contact plate 6 and the iron core 13 are arranged between the two retaining rings, a first spring 4 is provided between the upper bracket 3 and the moving shaft 16 plate, and a second spring 15 is provided between the first bracket 3 and the iron core 13.

[0036] In this embodiment, a coil is wound around the lower bracket 14, and the iron core 13 is located within the coil.

[0037] In this embodiment, two terminal posts 5 are separately arranged at both ends of the moving contact plate 6.

[0038] In this embodiment, the terminal post 5 includes a connecting portion and a stationary contact, the stationary contact is arranged inside the sealed cavity 12, and the connecting portion is located outside the housing.

[0039] When filling the contactor with an inert gas, high-pressure inert gas is injected into the intake pipe 7, the inert gas enters the sealed cavity 12 of the contactor, the inert gas quickly discharges the air inside the contactor from the exhaust pipe 8, and at the same time, the exhaust pipe 8 is connected to an inert gas purity detector. When the detector detects that the purity of the discharged gas reaches the set value, the exhaust pipe 8 is clamped and sealed using a pipe wrench, and then inert gas is continuously injected into the contactor through the exhaust pipe 8. When the air pressure inside the contactor reaches the set value, the intake pipe 7 is then clamped and sealed, thereby realizing the steps of inflating and sealing the contactor.

[0040] Relevant experimental verifications were carried out on the above-mentioned double-exhaust contactor and single-exhaust pipe contactor, and the test data were summarized as follows: Number of tests: 5000 double-exhaust structure high-voltage DC contactors; 5000 single-exhaust structure high-voltage DC contactors.

[0041] Test requirements: Select the BSBC7-100 series products of Baishibao Company. For the previous part of the products, assemble them normally according to the production process requirements of our company. During the process of removing internal foreign matters, perform the following operations: For the high-voltage DC contactor with a double-exhaust structure, connect pure air with a pressure of 0.6 Mpa to one exhaust pipe, blow for 15 s, and immediately enter the next process after blowing, fill with inert gas, and clamp the exhaust pipe to completely isolate the inside of the product from the outside; For the high-voltage DC contactor with a single-exhaust structure, for the product with a single exhaust pipe, still follow the original process, place it in a sealed box, evacuate the airtightness, and maintain it for 15 s in a vacuum environment, then immediately enter the next process, fill with inert gas, and clamp the exhaust pipe to completely isolate the inside of the product from the outside.

[0042] Verification method: By performing make-break tests on the products, each product is tested for 300 make-break cycles, and the products with non-conductive closing are removed. The products with non-conductive closing are caused by foreign matters on the contacts, which means that the removal of foreign matters is not complete.

[0043] Through experimental verification, the qualification rates of the products with the above two structures in the make-break conduction test are shown in the following table.

[0044] Exhaust pipe type Number of unqualified split and conduction tests Total production quantity Qualified rate Dual exhaust pipe 0 5000 100％ Single exhaust pipe 3 5000 99.94％

[0045] Product qualification rate comparison table

[0046] In the description of this specification, the descriptions with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0047] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present utility model without departing from the principle and purpose of the present utility model.

Claims

1. A high-voltage DC contactor with double exhaust pipes, comprising a housing and a contact system. A sealing cavity (12) is arranged inside the housing. The contact system includes a terminal (5) and a moving contact plate (6). The terminal (5) is fixedly connected to the housing. One end of the terminal (5) extends into the sealing cavity (12). The moving contact plate (6) is movably arranged inside the sealing cavity (12). The terminal (5) and the moving contact plate (6) are arranged opposite to each other. The moving contact plate (6) can approach or move away from the terminal (5) under the action of an external force. It is characterized in that: An air inlet pipe (7) and an air outlet pipe (8) are provided on the housing. Both the air inlet pipe (7) and the air outlet pipe (8) extend into a sealed cavity (12) inside the housing. Gas can enter the sealed cavity (12) through the air inlet pipe (7), and the gas inside the sealed cavity (12) can be discharged through the air outlet pipe (8).

2. The high-voltage DC contactor with a double exhaust pipe according to claim 1, wherein: Both the air inlet pipe (7) and the air outlet pipe (8) are copper pipes.

3. A high-voltage DC contactor with double exhaust pipes according to claim 1, characterized in that: Both the air inlet pipe (7) and the air outlet pipe (8) can be clamped and sealed with a pipe wrench.

4. A high-voltage DC contactor with a double exhaust pipe according to claim 1, characterized in that: The housing includes an iron cup (2). A sealing layer (4) is provided at the opening of the iron cup (2). The iron cup (2) and the sealing layer (4) cooperate to form the sealed cavity (12).

5. The high-voltage DC contactor with a double exhaust pipe according to claim 4, characterized in that: The material of the sealing layer (4) is epoxy resin.

6. A high-voltage DC contactor with a double exhaust pipe according to claim 4, characterized in that: The housing further includes an outer shell (1). An upward opening is provided on the outer shell (1). The iron cup (2) is located inside the opening of the outer shell (1). The sealing layer (4) fixes the iron cup (2) inside the outer shell (1).

7. The high-voltage DC contactor with double exhaust pipes according to claim 1, characterized in that: An upper bracket (3) and a lower bracket (14) are provided inside the sealed cavity (12). The iron core (13) is installed on the lower bracket (14) through a bearing (9). The moving shaft (16) passes through the iron core (13) and the moving contact plate (6). The moving shaft (16) is in sliding fit with the iron core (13) and the moving contact plate (6).

8. A high-voltage DC contactor with a double exhaust pipe according to claim 7, characterized in that: Circlips are provided at both ends of the moving shaft (16). The moving contact plate (6) and the iron core (13) are arranged between the two circlips. A first spring (11) is provided between the upper bracket (3) and the moving shaft (16) plate, and a second spring (15) is provided between the first bracket and the iron core (13).

9. A high-voltage DC contactor with a double exhaust pipe according to claim 7, characterized in that: A coil is wound around the lower bracket (14), and the iron core (13) is located inside the coil.

10. The high-voltage DC contactor with double exhaust pipes according to claim 1, characterized in that: The terminal (5) includes a connecting part and a static contact. The static contact is provided inside the sealed cavity (12), and the connecting part is located outside the housing.

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