Oil-immersed maintenance-free contact group

Abstract

The utility model provides an oil-immersed maintenance-free contact group, and relates to the technical field of electric switch machines, the oil-immersed maintenance-free contact group comprises: a housing having an oil storage chamber; the static contact blocks are mounted on the two sides of the top of the shell; the rear cover covers one end of the oil storage cavity; the main shaft is rotationally connected into the oil storage cavity, one end of the main shaft is close to the rear cover, the other end of the main shaft extends out of the oil storage cavity, and a plurality of open holes are formed in the main shaft; the anti-retreating plug is connected to one end of the open hole; the movable connection assembly is at least partially located in the open hole, the movable connection assembly comprises a spring cushion block, a spring and a movable connection point block, the spring cushion block is arranged on the anti-retreat plug, the spring is arranged on the spring cushion block, the movable connection point block is arranged on the spring, and the movable connection point block is arranged on the spring. The contact group adopts the design of double springs and double movable contact blocks, and the contact group can realize contact signal double insurance during operation.

Description

Technical Field

[0001] This utility model relates to the field of electric switch machine technology, specifically to an oil-immersed maintenance-free contact assembly. Background Technology

[0002] The contact group on a switch machine is a set of electrical switch contacts. The electrical switching function of the contact group can control the on / off state of the circuit and provide feedback to ensure that the turnout position signal and mechanical action are consistent. It usually includes stationary contacts mounted on the housing and moving contacts that move with the main shaft. The moving contacts can close or open with the stationary contacts, and the stationary contacts can be connected to external control circuits. With the development of railway transportation, users are paying more and more attention to the maintenance-free performance of the contact group. In addition, the faults such as the breakage of the stop component, the growth of white hair on the surface of the contact group causing the indicator to not work, and the indicator to be intermittently interrupted are becoming increasingly prominent in the existing technology. Utility Model Content

[0003] The purpose of this invention is to overcome the defects of the prior art and provide an oil-immersed maintenance-free contact assembly to improve the stability and reliability of electric switch machines in the prior art.

[0004] To achieve the above and other objectives, this utility model is implemented through the following technical solution: This utility model provides an oil-immersed maintenance-free contact assembly, the contact assembly comprising:

[0005] The housing has an oil storage cavity; stationary contact blocks are installed on both sides of the top of the housing; a rear cover covers one end of the oil storage cavity; a main shaft is rotatably connected to the oil storage cavity, one end of the main shaft is close to the rear cover, and the other end of the main shaft extends out of the oil storage cavity, and the main shaft is provided with multiple openings; an anti-reverse plug is connected to one end of the openings; and a movable connection assembly is at least partially located in the openings, the movable connection assembly includes a spring pad, a spring, and a movable contact block, the spring pad is disposed on the anti-reverse plug, the spring is disposed on the spring pad, the spring includes a first spring and a second spring, the first spring is located outside the second spring, the movable contact block includes a first movable contact block and a second movable contact block, the movable contact block is disposed on the spring, the second movable contact block is disposed inside the first movable contact block, and the movable contact block and the stationary contact block form an arc surface contact in the oil storage cavity.

[0006] The oil-immersed maintenance-free contact assembly adopted in this utility model has the following beneficial effects: The maintenance-free contact assembly structure of this utility model is miniaturized, and the contact assembly can be adapted to various types of switch machines. It no longer uses the line contact mode of contact plate and contact ring, but adopts copper block contact. The contact surface of the stationary contact block and the moving contact block adopts a precise self-correcting arc surface contact design (the arc surface curvature contact error of the contact part does not exceed 0.07mm), which ensures the contact fit rate from the design level. The surface contact of the contact is achieved through the arc surface, which improves the contact stability and contact strength of the contact.

[0007] The contact friction mode of the maintenance-free contact assembly is changed from shear friction to sliding friction, and under the action of oil medium, the frictional resistance and contact surface wear are significantly reduced. After the contact assembly is assembled, the contact surfaces of the moving contact block and the stationary contact block have a certain pre-pressure, and there is no deformation during the operation of the contact. The structural design ensures that the contact pressure is always in a constant state.

[0008] The moving contact section of the maintenance-free contact group adopts a double-spring, double-moving contact block design, which enables the contact group to achieve double protection of the contact signal during operation, greatly increasing the contact redundancy of the contact and making the performance of the contact group more stable and reliable.

[0009] The maintenance-free contact assembly features a turbulence mechanism on both sides of the moving contact spindle. During operation, the oil inside the cavity generates eddies that clean impurities on the contact surface, thus achieving a maintenance-free effect.

[0010] The maintenance-free contact assembly adopts an oil-immersion design. During operation, the insulating oil can extinguish the arc and reduce the impact of electrical corrosion on the contact surface. It can not only avoid the deviation of the installation position of the moving and stationary contacts, but also protect the contact parts of the contacts from the influence of the external environment. Attached Figure Description

[0011] Figure 1 The diagram shown is a structural schematic of the contact assembly of this utility model.

[0012] Figure 2 The diagram shows the main shaft and anti-reverse plug of the contact assembly of this utility model.

[0013] Figure 3 The image shown is a cross-sectional view of the main shaft of this utility model.

[0014] Figure 4 The diagram shown is a structural schematic of the main shaft of this utility model.

[0015] Figure 5 The diagram shown is a structural schematic of the moving connection component of this utility model.

[0016] Figure 6 The diagram shown is an exploded view of the moving connection component of this utility model.

[0017] Figure 7 The image shown is a cross-sectional view of one side of the contact assembly of this utility model.

[0018] Figure 8 This is a cross-sectional view of the other side of the contact assembly of this utility model.

[0019] The following labels are used in the diagram: 1-Housing, 100-Positioning pin, 200-Water bucket nut, 11-Oil reservoir, 2-Static contact block, 3-Rear cover, 31-Groove, 4-Bearing, 41-First bearing, 42-Second bearing, 5-Main shaft, 51-Opening, 52-Copper sleeve, 53-Concave tooth, 54-Internal thread, 55-Break mechanism, 6-Anti-reverse plug, 61-External thread, 62-Protruding tooth, 7-Moving contact assembly, 71-Spring pad, 72-First spring, 73-Second spring, 74-First moving contact block, 741-First base, 742-First contact wing, 751-Second base, 752-Second contact wing, 75-Second moving contact block, 300-Bolt, 400-Sealing ring, 8-Skeleton oil seal, 9-Wave spring. Detailed Implementation

[0020] Please see Figures 1 to 8 The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.

[0021] like Figure 1 and Figure 2 As shown, this utility model provides an oil-immersed maintenance-free contact assembly, which includes a housing 1 and an oil storage chamber 11 provided on the housing 1.

[0022] like Figure 1 As shown, the contact group includes a stationary contact block 2, which can be installed on both sides of the top of the housing 1, and the stationary contact block 2 can form an arc-shaped surface contact with the moving contact assembly 7.

[0023] like Figure 7 As shown, the contact assembly includes a rear cover 3, which is disposed at one end of the housing 1 and covers one end of the oil storage cavity 11.

[0024] like Figure 2 and Figure 7As shown, the contact assembly includes a main shaft 5, which can rotate within the oil storage chamber 11. The main shaft 5 can be at least partially located within the oil storage chamber 11. Furthermore, a groove 31 is provided on the rear cover 3. The contact assembly includes a bearing 4. A first bearing 41 is provided within the groove 31. One end of the main shaft 5 is connected to the first bearing 41. A second bearing 42 is sleeved on the other end of the main shaft 5 away from the rear cover 3. The second bearing 42 is located within the oil storage chamber 11.

[0025] like Figure 1 As shown, the housing 1 has a positioning pin 100 and a bucket nut 200 on one end face near the rear cover 3. The positioning pin 100 and the bucket nut 200 can be located around the oil storage cavity 11, and can be used to install the rear cover 3. In some embodiments, the stationary contact block 2, the housing 1, and the bucket nut 200 can be integrally injection molded.

[0026] like Figure 7 As shown, the rear cover 3 can be connected and fixed to the end of the housing 1 by bolts 300 and bucket nuts 200.

[0027] like Figure 7 As shown, in some embodiments, a sealing ring 400 may be provided between the rear cover 3 and the housing 1 outside the oil storage cavity 11, and a corrugated spring 9 may be provided between the rear cover 3 and the main shaft 5.

[0028] like Figure 3 As shown, the main shaft 5 is provided with a plurality of openings 51, for example, four openings 51 are arranged at equal intervals, and one end edge of the opening 51 may be provided with concave teeth 53.

[0029] like Figure 2 As shown, the contact assembly includes an anti-retraction plug 6, which can be located within the oil reservoir 11 and connected to the internal thread 54 of the opening 51. The anti-retraction plug 6 is provided with a protruding tooth 62 that matches the concave tooth 53. When the external thread 61 of the anti-retraction plug 6 is screwed into the internal thread 54 of the spindle 5, the protruding tooth 62 on the anti-retraction plug 6 will be locked by the concave tooth 53, thereby achieving the purpose of preventing the anti-retraction plug 6 from retracting.

[0030] like Figure 5 and Figure 6As shown, the contact assembly includes a movable contact component 7, which is at least partially located within the opening 51. One end of the movable contact component 7 contacts the anti-retraction plug 6. The movable contact component 7 includes a spring pad 71, one end of which contacts the anti-retraction plug 6. The movable contact component 7 also includes a spring, one end of which contacts the other end of the spring pad 71. The spring includes a first spring 72 and a second spring 73, with the first spring 72 located below the second spring. In addition to 73, the movable contact assembly 7 includes a movable contact block, which includes a first movable contact block 74 and a second movable contact block 75 located within the first movable contact block 74. One end of the movable contact block contacts the other end of the spring. The top end of the movable contact block has an arc structure. The curvature of the arc at the top end of the movable contact block is consistent with the curvature of the arc at the contact point of the stationary contact block 2, thereby forming a self-correcting structure. This ensures that there is no light leakage when the movable contact block contacts the stationary contact block 2, improving the contact strength and contact stability.

[0031] like Figure 6 As shown, the moving contact block further includes a base with contact wings on both sides, and the top of the contact wings has the arcuate structure. The contact wings can protrude from the outer surface of the main shaft 5.

[0032] like Figure 6 As shown, the first movable contact block 74 includes a first base 741 and a first contact wing 742, and the second movable contact block 75 includes a second base 751 and a second contact wing 752.

[0033] like Figure 6 As shown, the overall structure of the moving contact assembly 7 is a double-spring, double-moving-contact block structure. The first moving contact block 74 and the second moving contact block 75 can each form independent contact without interfering with each other. This allows each set of contacts to form a double-safety contact method, thereby greatly enhancing the conductivity stability of the contacts.

[0034] like Figure 3 As shown, in some embodiments, a copper sleeve 52 is provided inside the opening 51, and the copper sleeve 52 can be integrally injection molded with the spindle 5.

[0035] like Figure 4 As shown, in some embodiments, a turbulence-disrupting mechanism 55 is provided on the main shaft 5, and the turbulence-disrupting mechanism 55 can be located on both sides of the opening 51. When the main shaft 5 rotates, the turbulence-disrupting mechanism 55 can cause the oil to form a turbulent vortex in the oil storage chamber 11, which can self-clean foreign matter on the moving contact block and the stationary contact block 2. The turbulence-disrupting mechanism 55 can be an arc-shaped turbulence-disrupting groove.

[0036] like Figure 7As shown, the contact group includes a skeleton oil seal 8, which can seal the space between the main shaft 5 and the housing 1. The skeleton oil seal 8 is sleeved on the main shaft 5 and located in the oil storage cavity 11. Specifically, the skeleton oil seal 8 can be located on the side of the second bearing 42 away from the rear cover 3.

[0037] like Figure 8 As shown, when the main shaft 5 rotates to a preset position during operation, the contact wings of the first moving contact block 74 and / or the second moving contact block 75 can form an elastic pressure connection with the stationary contact block 2 in the oil storage cavity 11, establishing an electrical connection path to achieve signal transmission.

[0038] Therefore, this utility model effectively overcomes the various shortcomings of the prior art and has high industrial application value. The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit this utility model. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. An oil-immersed maintenance-free contact set, characterized by: The oil-immersed maintenance-free contact group comprises: a housing having an oil storage cavity; a static contact block mounted on both sides of the top of the housing; a rear cover covering one end of the oil storage cavity; a main shaft rotatably connected in the oil storage cavity, one end of the main shaft being close to the rear cover, the other end of the main shaft extending out of the oil storage cavity, and a plurality of openings being provided on the main shaft; a retreat-preventing plug connected to one end of the opening; and a moving contact assembly at least partially located in the opening, the moving contact assembly comprising a spring pad, a spring and a moving contact block, the spring pad being provided on the retreat-preventing plug, the spring being provided on the spring pad, the spring comprising a first spring and a second spring, the first spring being located outside the second spring, the moving contact block comprising a first moving contact block and a second moving contact block, the moving contact block being provided on the spring, and the second moving contact block being provided in the first moving contact block, the moving contact block and the static contact block forming a circular arc surface contact in the oil storage cavity.

2. The oil-immersed maintenance-free contact set according to claim 1, characterized in that: An inner thread is provided in the opening of the main shaft, and an outer thread matching the inner thread is provided on the retreat-preventing plug.

3. The oil-immersed maintenance-free contact set according to claim 2, characterized in that: The retreat-preventing plug has a protruding tooth, and the edge of one end of the opening outside the inner thread has a recessed tooth matching the protruding tooth.

4. The oil immersed maintenance free contact set as defined in claim 1 wherein: The main shaft is provided with a flow disturbing mechanism on both sides of the opening.

5. The oil immersed maintenance free contact set as defined in claim 1 wherein: The contact surfaces of the moving contact block and the static contact block are consistent in curvature.

6. The oil immersed maintenance free contact set as defined in claim 1 wherein: A copper sleeve is provided in the opening, the copper sleeve being integrally injection molded with the main shaft, and the static contact block being integrally injection molded with the housing.

7. The oil immersed maintenance free contact set as defined in claim 1 wherein: The moving contact block comprises a base and contact wings located on both sides of the base.

8. The oil immersed maintenance free contact set as defined in claim 1 wherein: A sealing ring is provided around the oil storage cavity, the sealing ring being provided between the housing and the rear cover.

9. The oil immersed maintenance free contact set as defined in claim 1 wherein: The rear cover has a groove, a first bearing being provided in the groove, one end of the main shaft being provided in the first bearing, a second bearing being provided on the other end of the main shaft away from the rear cover, and the second bearing being located in the oil storage cavity.

10. The oil-immersed maintenance-free contact set according to claim 9, characterized in that: The main shaft is provided with a skeleton oil seal in the oil storage cavity, the skeleton oil seal being provided on the side of the second bearing away from the rear cover.

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