JPH03210720A - Switchgear - Google Patents

Abstract

PURPOSE:To improve adhesion strength, wear resistance, and corrosion resistance, and make lubrication unnecessary by forming a TiN layer on the surfaces of sliding parts and fitting parts of steels while having a Ti intermediate layer between them and forming a TiC layer on the TiN layer. CONSTITUTION:A throwing cam 10 is installed on a shaft in a supporting shaft 12 installed on a shaft in an apparatus frame 6 and a throwing catch lever 15 is installed on a shaft in the apparatus frame 6 in the way of projecting a pin shaft 16 to the rotary route. Each sliding part and fitting part of the link system 7 are made of a steel product (a). Before a corrosion resistant TiN layer (d) is formed on the steel product (a), the steel product (a) is coated with a Ti layer (c) having a good adhesion property with the layer (d) and a TiC layer (e) having high corrosion resistance is formed further. In this way, adhesion strength, wear resistance, and corrosion resistance are improved and also no lubricating oil is needed and thus cleaning, re-application of grease, etc., and periodical check and maintenance become unnecessary.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a switchgear that is incorporated into, for example, an electric motor or the next side of a power condenser, and particularly relates to an operation link mechanism in this switchgear. Regarding.

(Prior Art) The operation link mechanism in this type of opening/closing device that has already been proposed is configured as shown in FIGS. 3 to 6.

That is, in FIGS. 3 to 6, a plurality of vacuum valve chambers 2 (only one in the figure) are formed in a box-shaped insulating case 1 made of an insulating material, and each of the vacuum valve chambers 2
A power terminal 3 and a load terminal 4, which serve as a three-phase power source constituting a main circuit, are provided facing each other above and below the insulating case 1, where the insulating case 1 is located. Further, a well-known vacuum valve 5 is vertically installed between the power supply terminal 3 and the load terminal 4, and each fixed electrode 5a of this vacuum valve 5 is connected to the power supply terminal 3.
The movable electrode 5b of the vacuum valve 5 is connected to each of the load terminals 4.

On the other hand, a machine frame 6 is provided on the front surface of the insulating case 1 and is integrated with the truck.A well-known operation link mechanism 7 is integrated with the movable electrode 5b of the vacuum valve 5 on the machine frame 6. The drive lever 9 is connected to the operating rod 8 via a drive lever 9 which is pivotally mounted on a support shaft 9a.

That is, in FIGS. 3 and 4, a charging cam 10 and an arm rod 11 are rotatably mounted on a rotation shaft 12 in the middle of the machine frame 6. A closing spring 13 is provided to urge the closing cam 10 to rotate clockwise.

Further, a roller (bearing) 14 is attached to the biased position of the input cam 10, and a T
A letter-shaped input catch lever 15 is mounted on a pin shaft 16 so as to project onto the rotation path of the roller 14. Furthermore, one end 15 of this input catch lever 15
a is locked to a charging shaft 17 having a half-moon cross section and integral with an operating shaft of an electromagnet (not shown), and the other end 15b of the charging catch lever 15 is connected to the machine frame 6 by a support shaft 18. It is in contact with a part of the shaft-mounted louver 19.

Furthermore, the driving lever 9 is connected to a part of the first lever 19 via a connecting rod 2o, and the third lever 19 is supported by a circuit spring 21 having a stronger elasticity than the closing spring 13. It is biased to rotate counterclockwise around the shaft 18. A second lever 22 is connected to the upper end of the lever 19 by a pin 23, and a third lever 24 having a roller 24a is connected to the second lever 22 by a pin 25. Furthermore, a free end of a swing arm rod 26 pivotally connected to the machine frame 6 and a base of a trip lever 27 are pivotally connected to one end of the third lever 24 by a pin shaft 28. The free end of the lever 27 is attached to a support shaft 29 on the machine frame 6 above the input cam 10.
It is connected by a pin 31 to a biased position of a trip catch member 30 which is mounted on a shaft. Furthermore, a part of this trip catch member 30 is locked by a trip shaft 32 attached to the machine frame 6 and having a half-moon cross section, and this trip shaft 32 receives an opening command for the vacuum valve 5. connected to an electromagnet (trip coil).

Therefore, the operating linkage mechanism in the opening/closing device described above operates as follows.

1. Regarding the vacuum valve closing operation, in Figure 4, when the vacuum valve closing command is input,
An electromagnet (throwing coil), not shown, is excited. Then, the input shaft 17, which has a half-moon-shaped cross section, rotates clockwise, and the input catch lever 15, which is engaged with the input shaft 17, rotates clockwise around the pin shaft 16. When the roller 14 moves, the roller 14 comes off from the input catch lever 15. Then, the input cam 1 of this roller 14
0 rotates clockwise around the support shaft 12 due to the elasticity of the closing spring 13, so that the roller 24a in contact with this loading cam 10 is pushed outward. Then, as shown in FIG.
Since the lever 22 and the third lever 24 extend substantially linearly, the second lever 19 connected to the second lever 22 rotates to the right around the support shaft 18, so that the connecting rod 20 connected thereto rotates to the right around the support shaft 18. Since the drive lever 9 is rotated to the left around the support shaft 9a via the drive lever 9, the operating lever 8 connected to the operating lever 9 is pushed upward, and the movable electrode 5b integrated with the operating lever 8 is connected to the vacuum valve. Since it is connected to the fixed electrode of 5, the vacuum valve 5
is closed.

2. Regarding the opening operation of the vacuum valve, in Figure 5, when the command to open the vacuum valve is input,
An electromagnet (trip coil), not shown, is excited.

Then, the trip shaft 32 interlocked with this rotates clockwise, and the rotation of the trip shaft 32 disengages the trip catch member 30, so that the trip catch member 30 is rotated clockwise. The trip lever 27, which is integrated with the pin 31 connected to the trip catch member 30, is moved to the right.
Since the swing arm rod 26 connected at 8 rotates counterclockwise around its support shaft 26a, the third lever 24 and the second lever 22 are shaped like a dogleg by the elasticity of the circuit spring 21. bend,
The lever 19 rotates counterclockwise around the support shaft 18, so 1. This lever 19 rotates the drive lever 9 around the support shaft 9a via the connecting rod 20 and pulls down the movable electrode 5b, which is integrated with the operating rod 8, so that the movable electrode 5b is moved to a vacuum. An open circuit is formed at a distance from the fixed electrode 5a of the bulb 5 (see FIG. 4).

As described above, in order to improve wear resistance and operating efficiency of the operation link mechanism in the above-mentioned opening/closing device, grease is applied as a lubricant to the sliding members and the pivot joints thereof. It is designed to operate smoothly.

On the other hand, as shown in FIG. 6, the operation link mechanism 7 in the above-mentioned opening/closing device has various sliding members incorporated in the operation link mechanism 7 in order to improve wear resistance and operational efficiency. The steel material a as a fitting member is made of, for example, Ti(
A single coating (ceramic thin film) b of a titanium layer has already been proposed.

(Problem to be Solved by the Invention) However, the operation link mechanism in the above-mentioned opening/closing device is coated with grease as a lubricant on its sliding members and its pivot joints, so Due to this, as the grease oxidizes,
There are drawbacks such as not only impairing operating characteristics but also the risk of malfunction, and the need for periodic maintenance and inspection.

In addition, when a steel material (a) used as a sliding member or a fitting member is coated with a layer of coating material (ceramic thin film) (b), the corrosion resistance, friction, and abrasion characteristics vary depending on the type of coating material, and the coefficient of friction varies depending on the type of coating material. It is small but has poor corrosion resistance, or conversely, it has excellent corrosion resistance but
The coefficient of friction may be large, and when considered comprehensively from the standpoint of operating characteristics and reliability, there are problems with these.

The present invention has been made in view of the above-mentioned circumstances, and the present invention improves operating characteristics and reliability over a long period of time without applying grease as a lubricant to the sliding members of the operating link mechanism and their pivot joints. An object of the present invention is to provide a switchgear which is designed to improve the performance of the invention.

[Structure of the invention]

(Means for Solving the Problems and Their Effects) The present invention provides a corrosion-resistant surface of each sliding member and fitting member made of steel incorporated in the operating link mechanism in an opening/closing device for opening and closing a vacuum valve. A TiC layer with a low coefficient of friction and corrosion resistance is formed on the surface of this TiN layer with a Ti layer having adhesive properties interposed therebetween. By reducing the coefficient, it is possible to improve operating characteristics and reliability over a long period of time without applying grease.

(Example) Hereinafter, the present invention will be described with reference to an example illustrated in FIGS. 1 and 2.

Note that the present invention includes the same constituent members as those in the above-mentioned specific example.
The same reference numerals will be used to explain.

In FIG. 1, reference numeral 12 denotes a support shaft mounted on the machine frame 6 in an operation link mechanism in an opening/closing device for opening and closing a vacuum valve, and a charging cam 10 is mounted on this support shaft 12. A roller 14 is attached to the biased position of the input force cam 10, and a T is attached to the machine frame 6.
A letter-shaped input catch lever 15 is mounted on a bottle shaft 16 so as to project onto the rotation path of the roller 14.

Therefore, each sliding member and fitting member in the link mechanism 7 described above is made of steel material a. That is, the steel material a made up of each sliding member and fitting member is heated in advance to a processing temperature of about 500 to 600°C in a vacuum evaporation apparatus, and then heated to a vacuum temperature of about 10-5 to 10-4. Inside, before coating TiNJld, Ti
Apply rF4C coating by a few μm,
A coating of TiNFflId is deposited for a processing time of about 30 minutes to about 1 hour and 30 minutes to form a thin film of about 1 to 5 μm.

Next, acetylene gas is continuously supplied for about 1 hour and 30 minutes to form a TiC (titanium carbide) layer e of about 3 to 5
A surface coating with a thickness of .mu.m is formed, thereby forming a three-layer thin film of lower layer coating materials C and d and upper layer coating material e on the outer surface of the steel material a.

These coatings can be applied in a series of steps without taking out or taking out the steel material a.

Table 1 below shows the state of red rust caused by salt spray tests on materials coated with ceramics.
This figure shows the experimental results.

Table 1 Table 1 shows that steel material a has Tic/TtSTiN/Ti, Ti
A salt water injection test was conducted on ceramic coating materials coated with N/Ti+TiC thin films, and the corrosion resistance was compared.

As is clear from Table 1 above, T i N/T i
It is understood that those coated with +T i C have less occurrence of red rust and are superior in corrosion resistance compared to other coated ones coated with TiC/Ti.

Next, the graph shown in FIG. 7 is the result of experimentally measuring the friction coefficients of A with TiN/Ti coating and B with TiN/Ti+TiC coating.

Therefore, it is clear from the graph in Figure 7 that 1. :
, TiN/T i coating compared to T i N/T i coating.
Tic coating has a low coefficient of friction and stable friction characteristics over a long period of time.

Due to these, Tic/Ti and TiN/Ti
In order to take advantage of the characteristics of each coating, TiN/T, which has excellent corrosion resistance, is applied as a lower layer coating to the surface of steel material 8.
By coating the i-layers c and d and then coating the TiC layer e, which has a small coefficient of friction, it is possible to obtain a coating material with excellent corrosion resistance and wear resistance.

Next, Table 2 shows the adhesion strength test results for each ceramic-coated thin film.

Therefore, as is clear from Table 2, the TI according to the present invention
The N/Tl+TIC coating is superior to that of Tic/TI and TiN/Ti coatings.

Next, Table 3 shows the wear condition after the wear test.

With no coating, galling occurred at a sliding distance of 20 m.

In the case of the TIN/TI+TIC three-layer thin film according to the present invention, no galling or peeling of the thin film is observed at a sliding distance of 400 m, as with the greased and TiC/Ti coated films.

It should be noted that conventional power switchgear and industrial switchgear are considered to have sufficient durability as a product based on the number of operations as long as they have durability of about 400 m in terms of sliding distance.

As described above, the operating link mechanism of the opening/closing device according to the present invention is constructed by applying a coating with excellent corrosion resistance to the sliding surface and the mating surface of the sliding pair part, and then applying a coating with excellent friction and wear characteristics. By providing a thin film, it is possible to improve adhesion strength, wear resistance, and corrosion resistance, and also to reduce the coefficient of friction, prevent galling, etc., and eliminate the need for lubricating oil. Also, maintenance and inspection of lubrication is no longer necessary.

〔Effect of the invention〕

As described above, according to the present invention, a corrosion-resistant TiN layer is applied to the surface of each sliding member and fitting member made of steel, which are incorporated in the operating link mechanism in an opening/closing device for opening and closing a vacuum valve. It is formed through 71 layers with adhesive properties, and a T10 layer with a low coefficient of friction and corrosion resistance is formed on the surface of this TiN layer, which improves adhesion strength, abrasion resistance, and corrosion resistance. Not only can it be used without lubricating oil, it also eliminates the need for periodic maintenance inspections such as disassembly, cleaning, reapplying grease, etc., and reassembling due to deterioration of lubricating oils such as grease over time. Efficiency and reliability can be improved.

[Brief explanation of drawings]

FIG. 1 is a sloped opening showing a part of the operating link mechanism incorporated in the opening/closing device of the present invention, FIG. 2 is an enlarged sectional view of the chain circle A section in FIG. 1, and FIG. Figures 4 and 5 are side views of the switchgear, and Figure 6 is an enlarged view of the main parts of other switchgears that have already been proposed. FIG. 7 is a graph showing the relationship between the sliding distance and the coefficient of friction. a... Steel material, C... TL layer, d... TLN layer, e
...TiC layer. Figure 3 Figure 4 Figure 5 Figure 6 Drawing pressure: O125kgf/mm2 Slip (m) Figure 7

Claims (1)

[Claims] In an operation link mechanism in a switching device that opens and closes a vacuum valve, a corrosion-resistant TiN layer and an adhesive Ti layer are formed on the surface of each sliding member and fitting member made of steel that are incorporated in this operation link mechanism. , the surface of this TiN layer is made of Ti, which has a low coefficient of friction and is corrosion resistant.
A switchgear characterized by forming a C layer.