JPH03226931A - Switch - Google Patents

Abstract

PURPOSE:To maintain an excellent operating characteristic for a long period without applying any grease by previously applying a soft nitriding process to steel slide members of an operating link mechanism, and coating the slide members with a lubricant including fluororesin and molybdenum disulfide mixed in a specific ratio. CONSTITUTION:A soft nitriding process is previously applied to the steel slide and engagement members 19, 22-25 and the like of an operating link mechanism, thus enhancing the hardness and tensile strength of the steel. The slide members 19, 22-25 and so on are coated with a solid lubricant including fluororesin and molybdenum disulfide mixed in a mixture ratio of about 1:1 to 1:9 so as to reduce each friction coefficient of the slide members 19, 22-25 and the like. Therefore, a switch capable of maintaining an excellent operating characteristic for a long period can be obtained without applying any grease as a lubricant to the slide members and the pivoted portions thereof.

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. 5 to 7.

That is, in FIGS. 5 to 7, 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 the middle of the machine frame 6, there is a charging cam 10 and an arm rod 11.
is rotatably mounted on a rotation shaft 12, and this arm rod 1
1 is provided with a closing spring 13 biasing the closing cam 10 so as to rotate clockwise. In addition, a roller (bearing) is installed at the biased position of the input cam 10.
14 is attached to the machine frame 6, and a T-shaped input catch lever 15 is attached to the roller 14 with a pin shaft 16.
The shaft is mounted so as to protrude above the rotation path of the shaft.

Further, one end 15a of the input catch lever 15 is locked to a input shaft 17 having a half-moon cross section and integral with the operating shaft of an electromagnet (not shown), and the other end 15b of the input catch lever 15 is , a support shaft 18 is attached to the machine frame 6.
It is in contact with a part of the louver 19 which is mounted on the shaft. Furthermore, a part of this lever 19 is provided with the drive lever 9.
are connected via a connecting rod 20, and this lever 19 is urged to rotate counterclockwise around the support shaft 18 by a circuit spring 21 having a stronger elasticity than the closing spring 13. has been done. Furthermore, at the upper end of the louver 19,
A second lever 22 is connected with a pin 23, and this second lever 22 is connected with a pin 23.
The lever 22 includes a third lever 24 having a roller 24a.
are connected by a pin 25. Further, at one end of the third lever 24, there is provided a swing arm rod 2 which is pivotally connected to the machine frame 6.
6 and the base of the trip lever 27 are connected to the pin shaft 28.
The free end of the trip lever 27 is connected by a pin 31 to a biased position of a trip catch member 30 which is mounted on the machine frame 6 above the input cam 10 with a support shaft 29. ing. 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 6, when the vacuum valve closing command is input,
An electromagnet (throwing coil), not shown, is excited. Then, the input shaft 17, which is interlocked with this and has a half-moon shape in cross section, rotates clockwise, so the input catch lever 15, which is engaged with the input shaft 17, rotates clockwise around the pin shaft 16. As the roller 14 moves, the roller 14 comes off from the input catch lever 15. Then, the input cam 10 of this roller 14
is rotated clockwise around the support shaft 12 by the elasticity of the closing spring 13, so that the roller 24a in contact with the loading cam 10 is pushed outward. Then, as shown in FIG. 7, the second lever 22 and the third lever 24 to which the roller 24a is attached extend substantially linearly.
Since the second lever 19 connected to this second lever 22 rotates to the right around the support shaft 18, the continuous stroke 2 connected to this lever 19 rotates to the right around the support shaft 18.
0, the drive lever 9 is rotated to the left around the support shaft 9a, so the operating rod 8 connected to the drive lever 9 is pushed upward, and the movable electrode 5b integrated with the operating lever 8 is vacuumed. Since it is connected to the fixed electrode of the valve 5, the vacuum valve 5 is closed.

2. Regarding the opening operation of the vacuum valve, in Figure 7, 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 trip shaft 32 is disengaged from the trip catch member 30 due to the rotational movement, 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 lever 26 connected at 8 rotates counterclockwise around its support shaft 26a, the third lever 24 and the second lever 22 are bent into a dogleg shape by the elasticity of the circuit spring 21. bend,
Since the lever 19 rotates in the counterclockwise direction around the spindle 18, this lever 19 rotates the drive lever 9 around the spindle 9a via the connecting rod 20, and connects it to the operating rod 8. By pulling down the integrated movable electrode 5b, this movable electrode 5
b is separated from the fixed electrode 5a of the vacuum valve 5 to form an open circuit (see FIG. 6).

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.

(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 It deteriorates due to oxidation, which not only impairs its operating characteristics but also poses a risk of malfunction, and has drawbacks such as the need for periodic maintenance and inspection.

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 an operation link mechanism in an opening/closing device for opening and closing a vacuum valve. Nitriding is performed to increase the hardness and tensile strength of the steel material, and then the mixing ratio of fluororesin and molybdenum disulfide is approximately 1:1 to 1:9.
Coating with a solid lubricant mixed in a certain proportion,
Each sliding member made of steel has a low coefficient of friction 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 illustrated embodiment.

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 for explanation.

In FIGS. 1 and 2, reference numeral 18 denotes a support shaft that is mounted on the machine frame 6 in the operation link mechanism of the opening/closing device that opens and closes the vacuum valve. A second lever 22 is connected to the upper end of one of the first levers with a pin 23, and a third lever 24 is connected to the second lever 22 with a pin 25.

Therefore, each sliding member, fitting member, etc. made of these steel materials is subjected to soft nitriding treatment (nitriding treatment) in advance.
By this, the steel 41 due to each sliding member, fitting member, etc.
People are trying to increase hardness and tensile strength. That is, the steel material A made up of each sliding member, fitting member, etc. is heated to about 90°C at a nitriding temperature of about 570 degrees in a nitriding liquid bath for soft nitriding.
The surface is hardened by heating to a certain degree.

Next, the steel material A made up of each sliding member, fitting member, etc. that has been subjected to the soft nitriding treatment is subjected to sandblasting treatment and phosphate treatment (normal pretreatment), as shown in FIG. 2. By forming a minute uneven surface B on the surface of the steel material A, the adhesion with the phosphate thin film in the next step is improved.

Next, the steel material A made up of each sliding member and fitting member that has been subjected to the above-mentioned sandblasting treatment is treated with manganese phosphate treatment (approximately 97%
After heating the solid lubricant C, which is a mixture of fluororesin and molybdenum disulfide, at a temperature of ~100°C for a heating time of approximately 1 minute, a heat-resistant thermosetting resin material made of, for example, polyimide resin is applied as a member. About 1% of the mixture was added to the above steel material A.
It is coated to a thickness of about 0 to 15 μm, and then thermally cured at a heating temperature of about 180° C. for a heating time of about 40 minutes.

That is, in the present invention, the steel material A that has been subjected to the soft nitriding treatment and the sandblasting treatment is subjected to a manganese phosphate treatment. On the other hand, a solid lubricant C is produced by mixing fluororesin and molybdenum disulfide at a mixing ratio of approximately 1:1 to 1:9, and a polyimide resin (as an inverter) is added to this solid lubricant C.
1) on the surface of the above steel material A.
After coating to a thickness of about 0 to 15 μm, it is heated to about 180° C. and heat-cured for about 40 minutes and seconds.

The fluororesin mixed in the solid lubricant C is desirably about 15 to 18%, and the thermosetting resin material made of polyimide resin is desirably about 2 to 40%.

The steel material A made of each sliding member, fitting member, etc. treated in this way is made by increasing the hardness and tensile strength of the steel material A without using grease, and is made by mixing fluororesin and molybdenum disulfide. Solid lubricant C is applied to the above steel material A.
By coating the steel material A of each sliding member and fitting member, the coefficient of friction of the steel material A is reduced, and the operating characteristics and reliability are improved over a long period of time.

Next, the graph shown in FIG.
)-mild steel, and the one shown in Fig. 3 is a combination of bearing steel and mild steel, which is subjected to soft nitriding treatment, sand blasting treatment, manganese phosphate treatment (see below). treatment), then coated with solid lubricant C mixed with fluororesin and molybdenum disulfide and subjected to heat curing treatment, and after the above preliminary treatment, a general solid lubricant of molybdenum disulfide was coated. It is a graph showing the relationship between the friction coefficient and the sliding distance with a coated material.

That is, as is clear from the graph of FIG. 3, in the case of the present invention, the coefficient of friction is stable at a low value of about 0.07, and the sliding performance until the coefficient of friction becomes higher than the above is a sliding distance of about 80.
0m or more, resulting in a longer service life.

On the other hand, those coated with only a solid lubricant of molybdenum disulfide (MO82) without nitrocarburizing have a relatively high friction coefficient of 0.09 to 0.13. The variation and sliding distance are also about 200 m or less.

Incidentally, the operating link mechanism of a switching device such as a circuit breaker has a sliding distance of about 400 m as the life of its sliding portion, for example, and it is considered sufficient if the sliding distance is about 450 m or more.

Next, the graph shown in FIG. 4 is based on the combination of "mild steel-mild steel".

That is, after the mild steel of each sliding member and fitting member is subjected to soft nitriding treatment, sandblasting treatment, and manganese phosphate treatment as preliminary treatments, a solid lubricant containing a fluororesin and molybdenum disulfide is applied. The friction coefficient of the present invention is stable at about 0.07, and the sliding distance is approximately It is over 1000m.

In contrast, when mild steel is coated with a standard solid lubricant made only of molybdenum disulfide, the coefficient of friction is approximately 0.1.
Moreover, the slip distance is
It is concentrated below about 200 rn.

In this way, the present invention makes it possible to construct an operation link mechanism for a switchgear that has the friction coefficient and wear resistance necessary for the switchgear, and eliminates the need for lubricant using grease. It also saves work and eliminates oxidation and deterioration of lubrication efficiency due to aging.

〔Effect of the invention〕

As described above, according to the present invention, in the operation link mechanism of the opening/closing device for opening and closing the vacuum valve, each sliding member made of steel in the operation link mechanism is subjected to soft nitriding treatment in advance, and then the fluororesin resin is Since the coating is coated with a solid lubricant containing molybdenum disulfide and molybdenum disulfide at a mixing ratio of about 1:1 to 1:9, the coefficient of friction of each sliding member and fitting member made of steel is reduced. This not only improves operating characteristics and reliability over a long period of time without applying grease, but also eliminates the need to apply grease and prevents oxidation and deterioration of lubrication efficiency over time. This has excellent effects such as eliminating the need for maintenance and inspection using lubricants.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the main parts of the switchgear of the present invention, FIG. 2 is an enlarged sectional view of chain circle A in FIG. 1, and FIG.
4 and 4 are graphs showing the relationship between the coefficient of friction and the sliding distance of each sliding part made of the steel material of the present invention, and FIG.
Side view of the already proposed switchgear, Figures 6 and 7
The figures are diagrams for explaining the operation of the switchgear that has already been proposed. 6... Machine frame, 18... Support shaft, 19... No. 2 lever
2...Second lever, 24...Third lever, A...
Steel material, B... uneven surface, C... solid lubricant.

Claims (1)

[Claims] In the operation link mechanism of the opening/closing device that opens and closes the vacuum valve, each sliding member and fitting member made of steel in this operation link mechanism is subjected to nitrocarburizing treatment in advance, and then treated with fluororesin and molybdenum disulfide. Mix ratio about 1:1
A switchgear characterized by being coated with a solid lubricant mixed at a ratio of about 1:9 to 1:9.