A double-station direct-acting contact device

Abstract

The application discloses a double-station direct-acting contact device, which comprises a base, a driving assembly, a moving contact assembly and a static contact assembly connected to the base, the static contact assembly is fixed on the base, the moving contact assembly is connected with a driving rod of the driving assembly, the driving assembly can drive the moving contact assembly to slide horizontally on the base through the driving rod, the moving contact assembly comprises a first moving contact and a second moving contact, the first moving contact is fixedly connected with the second moving contact, and the moving contact assembly further comprises a wire lug, which is fixed between the first moving contact and the second moving contact. The application has simple structure and stable switching, and can meet the requirements of efficient switching and low cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power devices, in particular to a double-station straight-moving contact device. BACKGROUND

[0002] The on-load tap changer refers to a switching device that can be switched under the excitation or load of a transformer, and can be used to change the tap connection position of the transformer winding. The on-load tap changer on the market is usually a cylindrical on-load tap changer. The switching device in the cylindrical on-load tap changer is a moving contact device, and the transmission mechanism of the moving contact device is a rotary motor. The rotary motor drives the contact to move through a rotating shaft, thereby realizing switching between different stations. Such cylindrical on-load tap changer and moving contact device have the problems of large size, high cost, complex structure, slow switching speed, long arc extinguishing time, and serious contact ablation in long-term use, which greatly reduces the service life of the product. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a double-station straight-moving contact device with simple structure, stable switching, and the ability to meet the requirements of efficient switching and low cost.

[0004] To solve the above technical problems, the present application provides a double-station straight-moving contact device for switching the tap changer of two stations, comprising a base and a driving assembly, a moving contact assembly and a stationary contact assembly connected to the base. The stationary contact assembly is fixed on the base, the driving assembly comprises a driving rod, the moving contact assembly is connected with the driving rod, and the driving assembly can drive the moving contact assembly to slide horizontally on the base through the driving rod.

[0005] The moving contact assembly comprises a first moving contact and a second moving contact, the first moving contact is fixedly connected with the second moving contact, the driving assembly can drive the first moving contact to be electrically connected with one end of the stationary contact assembly in a straight line, or drive the second moving contact to be electrically connected with the other end of the stationary contact assembly, and the first moving contact and the second moving contact are respectively connected with the tap changer of two stations.

[0006] The moving contact assembly further comprises a wire lug, and the wire lug is fixed between the first moving contact and the second moving contact.

[0007] As an improvement of the above-mentioned scheme, the moving contact assembly further comprises a fixing seat, the fixing seat is connected with the driving rod, the fixing seat is provided with a first guide hole and a second guide hole, the first guide hole and the second guide hole are coaxially arranged and have the same size, the first moving contact can slide horizontally in the first guide hole, and the second moving contact can slide horizontally in the second guide hole.

[0008] As an improvement of the above-mentioned scheme, the first moving contact includes a first contact end and a first connecting end, the diameter of the first contact end is larger than that of the first connecting end, the second moving contact includes a second contact end and a second connecting end, the diameter of the second contact end is larger than that of the second connecting end, the moving contact assembly further includes a first spring and a second spring, the first spring is sleeved on the first connecting end, and the second spring is sleeved on the second connecting end.

[0009] The direction of the first contact end is opposite to that of the second contact end.

[0010] As an improvement of the above-mentioned scheme, the outer diameters of the first spring and the second spring are larger than the diameters of the first guide hole and the second guide hole, the first spring is arranged between the first contact end and the first guide hole, and the second spring is arranged between the second contact end and the second guide hole.

[0011] As an improvement of the above-mentioned scheme, the first connecting end is provided with external threads, and the second connecting end is correspondingly provided with internal threads; or the first connecting end is provided with internal threads, and the second connecting end is correspondingly provided with external threads.

[0012] The first moving contact and the second moving contact are fixedly connected through cooperation of the external threads and the internal threads.

[0013] As an improvement of the above-mentioned scheme, the moving contact assembly further includes a spring pad, the spring pad and the wire lug are sleeved between the first connecting end and the second connecting end, and the side end faces of the first connecting end and the second connecting end can press the wire lug and the spring pad.

[0014] As an improvement of the above-mentioned scheme, the stationary contact assembly includes a first stationary contact and a second stationary contact, the contact end of the first stationary contact is provided with a first boss, the contact end of the second stationary contact is provided with a second boss, the first boss can be electrically connected with the first contact end, and the second boss can be electrically connected with the second contact end.

[0015] As an improvement of the above-mentioned scheme, the driving assembly further includes a driving mechanism, the driving mechanism can drive the driving rod to reciprocate in the horizontal direction, and the fixing seat is fixed on the driving rod.

[0016] As an improvement of the above-mentioned scheme, the driving mechanism is a bistable permanent magnet linear driving mechanism, and the driving mechanism is fixed on the base.

[0017] As an improvement of the above-mentioned scheme, three groups of the moving contact assemblies are arranged on the driving rod.

[0018] The present application has the following beneficial effects:

[0019] The double-station straight driving contact device of the present application is provided with a driving assembly, a first moving contact, a second moving contact and a stationary contact assembly, the driving assembly can linearly drive the first moving contact and the second moving contact to be electrically connected with two ends of the stationary contact respectively, thereby realizing the function of switching different stations, and the linear driving is more efficient and faster than the rotary driving. The moving contact further comprises a wire lug, which can be used for electrically connecting with an external conductive part, thereby forming a double-station electrical system. The first moving contact and the second moving contact are fixedly connected, and the wire lug is fixed between the first moving contact and the second moving contact, thereby fixing the wire lug and improving the structural strength of the first moving contact and the second moving contact, so that the moving contact assembly can be switched stably. The present application uses fewer components and simpler structure, can realize quick switching and stable switching between different stations, and can meet the requirements of efficient switching and low cost. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structural schematic view of the double-station straight driving contact device of the present application;

[0021] Figure 2 is a split structural schematic view of the moving contact assembly of the present application;

[0022] Figure 3 is a structural schematic view of the stationary contact assembly of the present application;

[0023] Figure 4 is a first use state view of the double-station straight driving contact device of the present application;

[0024] Figure 5 is a second use state view of the double-station straight driving contact device of the present application. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below in combination with the drawings. It is hereby declared that the up, down, left, right, front, back, inner and outer directions appearing or about to appear in the present application in the text are based on the drawings of the present application, and are not specific limitations on the present application.

[0026] Referring to Figure 1The embodiment of the application discloses a double-station straight-acting contact device for switching taps of two stations, comprising a base 1, a driving assembly 2, a moving contact assembly 3 and a stationary contact assembly 4 connected to the base 1, the stationary contact assembly 4 is fixed on the base 1, and the base 1 is an insulating piece. Two ends of the stationary contact assembly 4 are respectively electrically connected with different stations, the moving contact assembly 3 is electrically connected with an external conductive piece, the driving assembly 2 comprises a driving rod 22, the moving contact assembly 3 is connected with the driving rod 22, the driving assembly 2 can drive the moving contact assembly 3 to slide horizontally on the base 1 through the driving rod 22, during the horizontal sliding process of the moving contact assembly 3, different ends of the moving contact assembly 3 can contact two ends of the stationary contact, so that the external conductive piece can be electrically connected with the taps of different stations, and the function of switching different stations is realized.

[0027] Referring to Figure 2 In order to realize the double-station switching, the moving contact assembly 3 comprises a first moving contact 31 and a second moving contact 32, in order to improve the connection stability of the first moving contact 31 and the second moving contact 32, the first moving contact 31 is fixedly connected with the second moving contact 32, the driving assembly 2 can drive the first moving contact 31 to be electrically connected with one end of the stationary contact assembly 4 or drive the second moving contact 32 to be electrically connected with the other end of the stationary contact assembly 4. The linear driving mode is faster than the rotary driving mode, and the response is more timely, so that the effect of rapid switching can be realized. In addition, the moving contact assembly 3 further comprises a wire lug 33, the wire lug 33 is fixed between the first moving contact 31 and the second moving contact 32, one end of the wire lug 33 can be electrically connected with the external conductive piece after crimping a soft wire, since the wire lug 33 is fixedly connected, the wire lug 33 can be kept stable during the station switching process, the connection stability between the wire lug 33 and the external conductive piece is ensured, so that the station switching is further stabilized.

[0028] The beneficial effects of the embodiment of the application are as follows:

[0029] The double-station direct-acting contact device of the embodiment of the present application is provided with a moving contact assembly 3 and a stationary contact assembly 4. The moving contact assembly 3 is divided into a first moving contact 31 and a second moving contact 32. Under the linear driving action of the driving assembly 2, the first moving contact 31 and the second moving contact 32 can be in contact with different ends of the stationary contact assembly 4, thereby realizing electrical connection. The first moving contact 31 and the second moving contact 32 are fixed with a wire lug 33. The wire lug 33 can be electrically connected with an external conductive part. When the first moving contact 31 or the second moving contact 32 is in contact with the stationary contact assembly 4, the external conductive part forms electrical connection with the stationary contact assembly 4 through the wire lug 33. Different ends of the stationary contact assembly 4 are connected with different stations. Therefore, when the first moving contact 31 and the second moving contact 32 are in contact with different ends of the contact assembly, the switching of different stations is completed. Since the linear driving mode is adopted, the switching of stations is faster than the rotary driving mode. In the switching process, the wire lug 33, the first moving contact 31 and the second moving contact 32 are fixedly connected, which can improve the stability during the switching of stations. Therefore, the embodiment of the present application uses fewer components and simpler structure, can realize the quick switching and stable switching between stations, and can meet the requirements of efficient switching and low cost.

[0030] In order to further fix the first moving contact 31 and the second moving contact 32, the moving contact assembly 3 further comprises a fixing seat 34 connected with the driving rod 22, so that the driving assembly 2 can drive the fixing seat 34 to move, thereby driving the moving contact assembly 3. The fixing seat 34 is provided with a first guide hole 341 and a second guide hole 342. The first guide hole 341 and the second guide hole 342 are coaxially arranged and have the same size. The first moving contact 31 can slide horizontally in the first guide hole 341, and the second moving contact 32 can slide horizontally in the second guide hole 342. Since the first moving contact 31 and the second moving contact 32 are fixedly connected, the first moving contact 31 and the second moving contact 32 can stably slide coaxially, accurately contact the stationary contact assembly 4, and realize stable electrical connection with different stations

[0031] Specifically, the first moving contact 31 comprises a first contact end 311 and a first connecting end 312, the diameter of the first contact end 311 is larger than that of the first connecting end 312, the second moving contact 32 comprises a second contact end 321 and a second connecting end 322, the diameter of the second contact end 321 is larger than that of the second connecting end 322. In order to enable the first moving contact 31 and the second moving contact 32 to be buffered when contacting the static contact assembly 4, and to be able to exert a pressing force, the moving contact assembly 3 further comprises a first spring 35 and a second spring 36, the first spring 35 is sleeved on the first connecting end 312, the end of the first spring 35 abuts against the end of the first contact end 311, so as to be able to clamp the first spring 35, the second spring 36 is sleeved on the second connecting end 322, the end of the second spring 36 abuts against the end of the second contact end 321, so as to be able to clamp the second spring 36. The outer diameter of the first spring 35 and the second spring 36 is larger than the hole diameter of the first guide hole 341 and the second guide hole 342. Therefore, the first spring 35 is arranged between the first contact end 311 and the first guide hole 341, and the second spring 36 is arranged between the second contact end 321 and the second guide hole 342. The direction of the first contact end 311 is opposite to that of the second contact end 321, so that the driving assembly 2 can drive the first contact end 311 and the second contact end 321 to move horizontally and reciprocally and complete switching of different contact points.

[0032] When the first moving contact 31 is driven by the driving assembly 2 to abut against one end of the static contact assembly 4, the driving assembly 2 continues to exert a driving force, so as to compress the first spring 35, thereby realizing buffering and pressing of the first moving contact 31. Similarly, when the second moving contact 32 is driven by the driving assembly 2 to abut against the other end of the static contact assembly 4, the driving assembly 2 continues to exert a driving force, so as to compress the second spring 36, thereby realizing buffering and pressing of the second moving contact 32. The first spring 35 and the second spring 36 are arranged separately, which can maximize the coaxial effect of the first moving contact 31 and the second moving contact 32, and also provides space for fixing of the wire lug 33.

[0033] In order to ensure the fixed connection effect of the first moving contact 31 and the second moving contact 32, the first connecting end 312 is provided with external threads, and the second connecting end 322 is correspondingly provided with internal threads; or the first connecting end 312 is provided with internal threads, and the second connecting end 322 is correspondingly provided with external threads. In this embodiment, the first connecting end 312 is provided with internal threads, and the second connecting end 322 is provided with external threads. The first moving contact 31 and the second moving contact 32 are fixedly connected with each other through the cooperation of external threads and internal threads. The moving contact assembly 3 further comprises a spring pad 37, the spring pad 37 and the wire lug 33 are sleeved between the first connecting end 312 and the second connecting end 322, after the threaded connection of the first connecting end 312 and the second connecting end 322, the side end face of the first connecting end 312 and the side end face of the second connecting end 322 can compress the wire lug 33 and the spring pad 37, so that the wire lug 33 and the spring pad 37 can be fixed between the first moving contact 31 and the second moving contact 32, further ensuring the fixing effect of the wire lug 33.

[0034] During installation, first, the first connecting end 312 and the second connecting end 322 are sleeved into the first spring 35 and the second spring 36 respectively, then the first connecting end 312 and the second connecting end 322 are passed through the first guide hole 341 and the second guide hole 342 on the fixed seat 34, and then the wire lug 33 and the spring pad 37 are sleeved on the connecting end of the moving contact with external threads, finally the first moving contact 31 and the second moving contact 32 are screwed together through threaded cooperation, and the wire lug 33 is fixed.

[0035] Referring to Figure 3 , the stationary contact assembly 4 comprises a first stationary contact 41 and a second stationary contact 42, the contact end of the first stationary contact 41 is provided with a first boss 411, the contact end of the second stationary contact 42 is provided with a second boss 421, the first boss 411 can be electrically connected with the first contact end 311, and the second boss 421 can be electrically connected with the second contact end 321. The first boss 411 and the second boss 421 can ensure the contact effect with the first contact end 311 and the second contact end 321.

[0036] The driving assembly 2 comprises a driving mechanism 21 and a driving rod 22, the driving mechanism 21 can drive the driving rod 22 to reciprocate in the horizontal direction, the fixed seat 34 is fixed on the driving rod 22, and the driving rod 22 is an insulating member. Preferably, the driving mechanism 21 is a bistable permanent magnet linear driving mechanism 21, the driving mechanism 21 is fixed on the base 1, the bistable permanent magnet linear driving mechanism 21 has the advantages of quick response and stable operation, and can guarantee the effect of efficient and stable switching of stations. Preferably, three groups of the moving contact assemblies 3 are arranged on the driving rod 22, and the three groups of the moving contact assemblies 3 are all on the same moving shaft.

[0037] Referring to Figure 4 and Figure 5 , in Figure 4 , the first contact end 311 is in close contact with the first boss 411 of the first static contact 41, and electrical connection is formed, at this time, the driving mechanism 21 is in a static state; when the driving mechanism 21 receives a power-on instruction, the driving mechanism 21 quickly drives the driving rod 22 to slide to the right, the driving rod 22 drives the fixed seat 34 to move to the right, and the fixed seat 34 drives the moving contact assembly 3 to move to the right; when the second contact end 321 abuts against the second boss 421 of the second static contact 42, the driving mechanism 21 continues to drive the driving rod 22 to move to the right and compresses the second spring 36 by a certain distance, at this time, the driving rod 22 moves to a set stroke position and stops moving to the right, power-on stops, the second contact end 321 and the second boss 421 are in close contact and are pressed together, electrical connection is formed, and the double-station straight moving contact device is kept in the Figure 5 station state. When the driving mechanism 21 is triggered to power on again, the driving mechanism 21 quickly drives the driving rod 22 to slide to the left, the driving rod 22 drives the fixed seat 34 to move to the left, and the fixed seat 34 drives the moving contact assembly 3 to move to the left; when the first contact end 311 abuts against the second boss 421, the driving mechanism 21 continues to drive the driving rod 22 to move to the left and compresses the second spring 36 by a certain distance, at this time, the driving mechanism 21 moves to a set stroke position and stops moving to the left, power-on stops, the first contact end 311 and the first boss 411 are in close contact and are pressed together, electrical connection is formed, and the double-station straight moving contact device is kept in the Figure 4 station state. The above movement is repeated to realize the on-off function of the double-station straight moving contact system.

[0038] The above is the preferred embodiment of the present application, and it should be pointed out that, for ordinary skilled persons in the technical field, a number of improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements are also regarded as the protection scope of the present application.

Claims

1. A dual-station direct-acting contact device for switching taps between two stations, characterized in that, The device includes a base and a drive assembly, a moving contact assembly, and a stationary contact assembly connected to the base. The stationary contact assembly is fixed to the base. The drive assembly includes a drive rod, and the moving contact assembly is connected to the drive rod. The drive assembly can drive the moving contact assembly to slide horizontally on the base via the drive rod. The moving contact assembly includes a first moving contact and a second moving contact. The first moving contact and the second moving contact are fixedly connected. The driving assembly can linearly drive the first moving contact to electrically connect to one end of the stationary contact assembly, or drive the second moving contact to electrically connect to the other end of the stationary contact assembly. The first moving contact and the second moving contact are respectively connected to the taps of two workstations. The moving contact assembly also includes a wire lug, which is fixed between the first moving contact and the second moving contact; The moving contact assembly also includes a fixed base, which is connected to the drive rod. The fixed base is provided with a first guide hole and a second guide hole. The first guide hole and the second guide hole are the same size and coaxially arranged. The first moving contact can slide horizontally in the first guide hole, and the second moving contact can slide horizontally in the second guide hole. The first moving contact includes a first contact end and a first connecting end, the diameter of the first contact end being larger than the diameter of the first connecting end. The second moving contact includes a second contact end and a second connecting end, the diameter of the second contact end being larger than the diameter of the second connecting end. The moving contact assembly also includes a first spring and a second spring, the first spring being sleeved on the first connecting end and the second spring being sleeved on the second connecting end. The orientation of the first contact end is opposite to the orientation of the second contact end; The first connecting end is provided with an external thread, and the second connecting end is provided with a corresponding internal thread; or the first connecting end is provided with an internal thread, and the second connecting end is provided with a corresponding external thread. The first moving contact and the second moving contact are fixedly connected to each other by the engagement of external threads and internal threads; The moving contact assembly also includes a spring pad, and the spring pad and the wire lug are sleeved between the first connecting end and the second connecting end. The side end face of the first connecting end and the side end face of the second connecting end can press the wire lug and the spring pad together. The outer diameters of the first spring and the second spring are both larger than the diameters of the first guide hole and the second guide hole. The first spring is disposed between the first contact end and the first guide hole, and the second spring is disposed between the second contact end and the second guide hole. The stationary contact assembly includes a first stationary contact and a second stationary contact. The first stationary contact has a first protrusion at its contact end, and the second stationary contact has a second protrusion at its contact end. The first protrusion is electrically connected to the first contact end, and the second protrusion is electrically connected to the second contact end.

2. The dual-station direct-acting contact device according to claim 1, characterized in that, The drive assembly further includes a drive mechanism that can drive the drive rod to reciprocate in the horizontal direction, and the fixed seat is fixed to the drive rod.

3. The dual-station direct-acting contact device according to claim 2, characterized in that, The driving mechanism is a bistable permanent magnet linear driving mechanism, which is fixed on the base.

4. The dual-station direct-acting contact device according to claim 1, characterized in that, Three sets of moving contact assemblies are provided on the drive rod.

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