KR830002735Y1 - Vacuum breaker - Google Patents

Abstract

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Description

Vacuum breaker

1 is a longitudinal sectional view showing another form of a conventional vacuum force circuit breaker.

Figure 2 is a longitudinal sectional view showing another form of the conventional vacuum force circuit breaker.

3 is a longitudinal sectional view showing a first embodiment of a vacuum force circuit breaker according to the present invention;

4 is a longitudinal sectional view showing a state in which the vacuum force breaker shown in FIG. 3 is temporarily assembled.

5 is a partial cross-sectional view showing a modified connection method for covering the insulating end plate shown in FIG.

6 to 13 are partial cross-sectional views showing the second to ninth embodiments of the present invention, respectively.

(In these figures, the same reference numerals denote the same or similar parts of the vacuum breaker of the present invention.)

The present invention relates to a vacuum force circuit breaker, and in particular, the present invention relates to a vacuum force circuit breaker configured so that the opening end of the bell-shaped metal casing is in contact with the insulating end plate.

More specifically, the present invention consists of a bell shaped metal casing of the same coefficient of thermal expansion of ceramics and an insulating end plate 19 (19a) having a circular hole 24 at the center of the brazing to be sealed to the opening end of the casing. The vacuum force breaker constituted by the vacuum container 21.

The vacuum force circuit breakers according to the present invention each have electrical contacts 22 and 23 at one end thereof and are arranged in a line in the axial direction of the vacuum container so that the latter can operate in correspondence with the former. ) And sealed at one end of the arc-shield and movable contact rod arranged to enclose electrical contacts in the vacuum vessel, and to the inner circumferential surface of the insulating end plate via the brazed end and the annular extension of the arc shield. It includes bellows 33 having the other end brazed.

In general, the vacuum force circuit breaker shown in FIG. 1 has an end plate (2) (3) attached to both end portions of the insulating cloth cylinder (1) of ceramics or ceramics and the cylindrical cloth (1), and electrical contact with each end. (5) (6) arranged to include a vacuum vessel (4) constituting a fixed and movable contact rod (7) (8) in the vacuum vessel (4) in which the latter connects to or falls from the former; will be.

In recent years, increasing the breaking capacity of a vacuum force circuit breaker has been aimed at. To meet this demand, the radius of the insulating cloth cylinder was increased by enlarging the radius of the electrical contactor.

However, because it is difficult to manufacture a cylinder for insulating cloth made of ceramic or ceramic, the precision of the diameter was kept within a predetermined range.

In particular, it is extremely difficult to fully satisfy such a requirement regarding a large-diameter insulating cloth cylinder.

If such a large-scale vacuum circuit breaker is manufactured, the material constituting the vacuum container becomes extremely expensive, and as a result, the price of the vacuum force circuit breaker also becomes expensive.

In view of this, another type of vacuum force circuit breaker as shown in FIG. 2 is proposed. This type of vacuum force breaker is an insulating end plate 9 of ceramic material having an annular projection 10 formed in one piece and a metal cup member 11 brazed to fix the opening to the annular projection 10. The vacuum container 12 is comprised.

The movable contact rod 14 having the electrical contact 13 moves in the axial direction of the vacuum vessel supported by the bottom portion 11a of the cup member 11 to constitute the vacuum vessel 12. The bellows 15 is mounted on the cup member 11 and brazed so that its upper end is hermetically sealed to the movable contact rod 14, but the lower end is brazed so as to be hermetically sealed to the bottom portion 11a of the cup member 11. The fixed contact rod 17 having the electrical contactor 16 falling or in contact with the contactor 13 is inserted into the insulating end plate 9 to be hermetically brazed. The electrical contactor is a cup-shaped arc shield member 18 which prevents contamination or degradation of the insulating end plate 9 due to metal vapor generated when the electrical contactor 13 comes into contact with or falls from the electrical contactor 16. (13) (16) to be surrounded to surround.

Since only one insulating end plate 9 of the insulator is required alone as compared with FIG. 1, the vacuum breaker shown in FIG. 2 can reduce the cost of the material constituting the end plate.

However, in connection with the assembly of FIG. 2, the expansion of the vacuum vessel 12 is suppressed in order to obtain the insulation creepage distance of the insulation end plate 9 within the vacuum vessel 12. As a result of enlarging the radius of the cup member 11, the annular protrusion 10 is formed on the insulating end plate 9. In order to manufacture the annular projection 10 of the insulating end plate 9 of the ceramic material, it is extremely difficult to form a mold such as a mold or a press.

Another obstacle is also pointed out, which is that much work is required to correct the deformation due to shrinkage of the ceramic that occurs during casting and sintering.

As a result, this causes the production price of the insulating end plate 9 to be raised.

Therefore, the production price of the vacuum force circuit breaker becomes high. The cup member 11 is provided on the insulating end plate 9 and brazed so that the open end of the cup member 11 is in contact with the upper end of the annular projection 10 of the insulating end plate 9.

As a result, it is difficult to equalize the distance between the cup member 11 and the arc-shield member 18 when fabricating the vacuum container.

Therefore, an installation tool for installing or arranging the process contact rod 17 and the movable contact rod 14 is required.

Otherwise, it is necessary to enlarge the outer radius of the cup member to make the arrangement range.

In general, when brazing a ceramic to a metal, it is preferable that the bonding or connecting surface is as small as possible in view of the difference in coefficient of thermal expansion.

On the contrary, it is preferable that it is as large as possible from the standpoint of sealing and mechanical force at the time of bonding.

However, in the vacuum circuit breaker shown in FIG. 2, the open end of the cup member 11 is connected to the annular projection 10, and the cup member 11 is formed of a cup-shaped durable metal rigid body.

Therefore, it is impossible to absorb or alleviate the thermal strain generated at the time of connection by the brazing material due to the deterioration of the cup member. As a result, there is a possibility that the insulating plate 9 of the ceramic material is broken.

Moreover, other disadvantages are pointed out as follows. That is, the cup member 11 should be made of a rigid body. The weak and weak force is in the immediate vicinity of the opening. This part is connected to the insulating end plate 9 of the ceramic material, thereby making it possible to enhance durability. However, in the cup member constituting the vacuum vessel, the internal stress should be concentrated in the vicinity of the opening. In this part, the thermal deformation force when bonding to the insulating end plate remains.

As a result, this part is considered the weakest part.

Therefore, when an impact generated during an input or a blocking operation is transmitted to this portion, there is a possibility that the coupling portion or the insulating end plate 9 is damaged.

Furthermore, in the vacuum force breaker, the bellows 15 is installed on the upper surface of the cup member 11 so that one end is fixed to the bottom portion 11a of the cup member 11. The other end is fixed to the circumferential surface of the movable contact rod 14.

Thus, the corrugated bottle may be damaged during assembly, connection to an operating unit or during operation.

The bottom portion 18a of the arc shield member 18 is located midway between the electrical contact 16 and the insulating end plate 9 and is directly brazed. The thermal expansion coefficients of the electrical contactor 16 and the arc-shield member 18 and the insulating end plates 9 are joined to be different and relatively large contact surfaces. This ensures that each member is always heated during input.

Therefore, the electrical contact 16, the arc shield member 18 and the insulating end plate 9 are subjected to thermal strain due to the difference in the coefficient of thermal expansion.

For this reason, the ceramic material insulating end plate 9 where there is a mechanical force may break.

Since the thermal conductivity of the ceramic forming the insulating end plate 9 is less than that of the metal, the heat generated by the arc (Alc) at the time of interruption is transferred to the insulating end plate 9 and the arc-shield via the electrical contactor 16. When conducting to the bottom portion 18a of the member 18, there is a possibility that cracks due to heat of the coupling or connecting pins facing the bottom portion 18a of the arc shield member 18 occur. It is also pointed out that the occurrence of cracks is enhanced when the impact due to input or interruption is transmitted to the mating surfaces described above. Other conventional vacuum force shut-offs that have been completed or have been published in public inspection are as follows.

British Patent Publication No. 1,298,448, issued December 6, 1972, discloses a vacuum vessel consisting of a cylindrical metal casing and an insulating end plate secured to the axial end of the vacuum vessel. U.S. Pat. It describes a vacuum vessel consisting of a fixed insulating end plate.

Patent application GB 2010587A, published on June 27, 1979 in the United Kingdom, describes a vacuum vessel consisting of a cylindrical metal casing and an insulating end plate fixed to the axial end of the metal casing.

In such a vacuum force breaker or the like, it is apparent that the same disadvantages described in connection with the vacuum force breaker shown in FIG. 2 are pointed out without a detailed explanation.

One of the objectives of the present invention is to provide a vacuum force circuit breaker having a novel structure consisting essentially of a bell-shaped metal casing connected by brazing to an insulation end plate and an insulation end plate.

Another object of the present invention is to provide a vacuum force circuit breaker that is simple in structure and easy to assemble.

Still another object of the present invention is to provide a vacuum force circuit breaker structure that can sufficiently absorb or mitigate thermal strain generated when a bell-shaped metal casing is brazed to an insulating end plate.

Still another object of the present invention is to provide a vacuum force circuit breaker whose residual thermal deformation force is as small as possible when the bell-shaped metal casing is connected to the insulating end plate by the brazing method, so that the insulating end plate can be prevented from being broken.

Still another object of the present invention is to provide a vacuum force circuit breaker capable of sufficiently absorbing or mitigating the shock generated when the vacuum vessel is made of brazing material and when the vacuum force circuit breaker is input or interrupted.

Still another object of the present invention is to provide a vacuum force circuit breaker having an extended creepage distance of the insulating end plate.

The present invention has a thermal expansion coefficient almost the same as that of the ceramic material and the insulating end plate 19 of the ceramic material, the bell-shaped metal casing 20 fixed to the outer periphery of the insulating end plate 19 and hermetically sealed and A fixed electrical contactor 22 at one end and a fixed contact rod 38 extending in the axial direction of the metal casing, and a movable contact rod 35 at one end and the fixed contact rod 38. The movable contact rod 35 arranged in a line and operated in correspondence with the fixed contact rod is also a vacuum force breaker composed of a vacuum vessel 21 disposed in the vacuum vessel to surround the fixed and movable electrical contacts 22 and 23. In the insulating end plate 19 is provided in the center of the end plate in which the circular hole 24 is formed; The movable contact rod (35) is disposed to extend through the circular hole (24) in the axial direction of the vacuum vessel (21); The arc shield member 30 is provided at one end thereof with a fixing portion 32 fixed into the circular hole 24 of the end plate; In addition, the bellows 33 has an annular axially extending portion 34 formed at an opening end thereof, and is disposed between the movable contact rod 35 and the arc shield member 30, and one end of the bellows 33. The vacuum is characterized in that the one end of the movable contact rod 35 is brazed tightly to the adjacent portion and the other end thereof is hermetically sealed to the inner drawing of the fixing portion 32 of the arc shield member 30. Provide a power breaker.

In another aspect of the present invention, a bell-shaped metal casing is brazed by installing an annular radially extending portion to be fixed along the outer circumference of the insulating end plate.

Another aspect of the present invention is that the insulating end plate is installed along the outer periphery of the end to be connected to the end of the annular radial extension of the casing.

Another aspect of the present invention is to install a metal part formed at the end of the insulating end plate.

Another aspect of the present invention is to install a metal part connected to the inner periphery of the insulating end plate.

Another aspect of the present invention is that the end of the arc-shield member is installed adjacent to the annular axial extension.

Another aspect of the present invention is that the fixed contact rod is supported by the bottom of the metal casing to the auxiliary annular end.

Features and advantages of the vacuum force circuit breaker of the present invention will become more apparent from the following description based on the accompanying drawings.

Preferred embodiments of the present invention will be described with reference to the accompanying drawings.

3 is a longitudinal sectional view showing the first embodiment of the vacuum force circuit breaker according to the present invention. As can be seen in FIG. 3, the vacuum force circuit breaker has a bell shaped metal casing 20, an insulating end plate 19 attached to the opening of the metal casing 20, and a fixed and movable electrical contact rod 38 disposed therein ( A fixed and movable contactors 22 and 23 are attached to one end thereof so as to constitute a vacuum vessel 21 in which the latter adheres to or falls from the former.

In more detail, the insulating end plate 19 is formed of a material containing a cast and sintered ceramic material. The insulating end plate 19 has a circular hole 24 formed at the center thereof, and an annular end portion 25 is formed at the outer periphery thereof.

In more detail, as can be seen in FIG. 4, the insulating end plate 19 also has the same Mo-Mn-Ti alloy as that of the ceramic whose thermal expansion coefficients are formed on the annular end portion 25 and the inner peripheral surface thereof, respectively. The metal layers 26 and 27 of In or Mn-Ti alloy are comprised.

The overall appearance of the metal casing 20 looks like a bell, which also forms a radially outwardly extending portion in the vicinity of its opening. Thus, the end portion 28 is formed at an adjacent portion of the extension portion 29. A metal casing 20 is formed in the opening of the portion 29 extending over the end portion 25 of the insulating end plate 19.

The inner peripheral surface of the opening end of the extension portion 29 is hermetically connected to the outer surface of the annular end portion 25 with a brazing material, which will be described later.

It should be noted that the method of forming the vacuum container by fixing the metal casing 20 on the insulating end plate 19 with the sealing brazing material is not limited to the above method.

Another method will be described based on FIG.

This vacuum container 21 construction method forms a metal layer 26a on a flat portion of the annular end portion 25 so as to be in parallel with both end surfaces of the insulating end plate 19, and further extends the portion 29 of the metal casing 20. ) Is attached to the outer circumferential surface of the annular end portion 25, and a brazing material is provided in accordance with the outer peripheral heat of the opening end provided in the extension portion 29, and the metal layer 26a of the annular end portion 25 is provided. And several steps of hermetically brazing the periphery of the opening of the extended portion 29. Thus, this method makes it possible to accurately position the metal casing 20 on the insulating end plate 19, and also to easily arrange the brazing material. In addition, since the brazing material is disposed outside the metal casing 20, the molten brazing material does not flow into the end face of the insulating end plate 19 in the vacuum vessel 21.

In the vacuum vessel 21 composed of the insulating end plate 19 and the metal casing 20, a cylindrical arc-shield member made of a Fe-Ni-Co alloy of Fe-Ni alloy, which is the same material as that of the metal casing 20. Annular fixation extending outwardly in the axial direction from an opening formed in the center of the bottom portion 31 which is fixed to the circular hole 24 of the insulating end plate 19 so that the 30 is co-centered with the metal casing 20. Disposed in the part 32.

The arc shield member 30 is installed to prevent contamination of the inner peripheral surface of the insulating end plate 19 due to the metal vapor generated when the movable electrical contactor comes into contact with or falls off from the fixed electrical contactor.

The arc shield member 30 is hermetically connected to a part of the bottom portion 31 of the arc shield member 30 with the metal layer 27 formed in the adjacent portion of the circular hole 24 of the insulating end plate 19. It is fixed to the insulating end plate 19. The width of the metal layer is preferably one-third of the radial length of the bottom portion 31 of the arc-shield member 30.

The gap between the opening of the arc shield member 30 and the metal casing 20 and the gap between the outer surface of the arc shield member 30 and the inner circumferential surface of the metal casing are selected to be a vacuum insulation breakdown distance. Be careful.

The creepage distance of the insulating end plate 19 in the vacuum vessel 21 in which the metal casing 20 is connected to the arc shield member 30 can be obtained, because the bottom of the arc shield member 30 is obtained. This is because a part of the portion 31 is connected to the insulating end plate 19, and the opening periphery of the extension portion 29 of the metal casing 20 is connected to the insulating end plate 19.

In the vacuum vessel 21, a bellows 33 of stainless steel or inconel is arranged to expand and contract in the axial direction. In more detail, the cylindrical axially extending portion 34 of the bellows 33 is fixed to the annular fixing portion 32 of the arc shield member 30. Thus, the bellows 33 is hermetically brazed to the opening end of the bellows 33 and the bottom portion of the arc shield member 30 to be fixed to the insulating end plate 19. In the bellows 33, a movable contact rod 35 of cu or cu alloy is inserted through the hole 36 in the center of the bottom portion of the bellows 33 so as to be disposed at the same center as the center of the vacuum vessel 21. More specifically, the movable contact rod 35 is supported by the bellows 33 to be radially extended and brazed to the bottom of the bellows 33.

An annular recess 37 is formed at the axial end of the movable contact rod 35.

The disk-shaped movable electrical contactor 23 is fixed to the annular recess 37 so as to protrude from the axial end surface of the movable contact rod 35.

A circular hole 20a is formed in the center of the bottom portion of the metal casing 20.

A cu or cu alloy fixed contact rod 38 having a fixed electrical contactor 22 is inserted through the circular hole 20a so as to face the movable contact rod 35.

In more detail, the annular flange 38a provided on the outer circumferential surface of the fixed contact rod 38 is brazed to be hermetically contacted with the upper portion of the metal casing 20.

A recess 39 is formed at the axial end of the fixed contact rod 38 (see FIG. 3). A brazing fixed electrical contactor 22 of a cu or cu alloy that moves along the movable contactor 23 is fixed to the recess 39 so as to protrude from the axial end.

A method of manufacturing the above-described vacuum force breaker will be described.

First, an insulating end plate 19 having a metal part is installed at a predetermined position on the insulating end plate 19 (not shown).

Second, as shown in FIG. 4, brazing material plate brazing is provided in the metal layer 27 adjacent to the circular hole 24. As shown in FIG.

In addition, the arc shield member 30 is installed so that the bottom portion 31 presses the brazing material 40. Then, the annular fixing portion 32 is fixed to the circular hole 24. In this state, the arc shield member 30 is disposed to be the same center as the insulating end plate 19 and is installed to be temporarily fixed.

Third, the bellows 33 is inserted into the cylindrical extension portion 34 downward from the top of the arc shield member 30, and the brazing material 41 is inserted into the lower end of the bellows 33 and the arc shield member. It inserts between the bottoms of the 30, and fixes the cylindrical extension part 34 of the bellows 33 in the annular fixing part 32 of the arc shield member 30. As shown in FIG. In this state, the bellows 33 is arranged in the same center as the insulating end plate 19 and is arranged to be temporarily fixed.

Fourth, the movable electrical contactor 23 is fixed to the concave 37 of the movable contact rod 35 with the brazing material 42, and the brazing material 43 is radially extended to the movable contact rod 35. And the bottom portion 31 of the bellows 33, and the movable contact rod 35 is inserted into the hole 36 of the bellows 33.

The outer end of the movable contact rod 35 is inserted into the central portion of the extension portion 34 of the bellows 33, positioned at a predetermined position and supported there.

It should be noted that it is sufficient to assemble the movable contact rod 35 to the bellows 33 before placing the bellows 33 relative to the arc shield member 30 and provisionally securing it to the arc-shield member 30. Furthermore, it is sufficient to install the movable electrical contactor 23 on the movable contact rod 35 after attaching the movable contact rod 35 to the bellows 33.

Fifth, the metal casing 20 is disposed on the end portion 25 where the metallization process is performed with the brazing material 44. Then, the opening of the extension portion 29 is fixed on the insulating cloth cylinder.

Therefore, the metal casing 20 is located at the same center as the insulating end plate 19 and is temporarily fixed thereto. As shown in FIG. 5, when the metal layer 26a is formed on the flat portion of the tip portion 25, the opening of the extension portion 29 is fixedly placed on the tip portion 25 and temporarily fixed thereto. The brazing material 44a is then placed over the metal layer 26a located outside the extended portion 29.

Sixth, the fixed electrical contactor 22 is fixed to the recess 39 of the fixed contact rod 38 with the brazing material 45, and the fixed contact rod 38 is attached to the flange 38a and the bottom of the metal casing. Suspended from the circular hole 20a formed in the center of the metal casing 20 through the brazing material 46 placed in between, and the fixed electrical contactor 22 is disposed on the movable electrical contactor 23. In this state, the fixed contact rod 38 is installed in the metal casing 20 and is temporarily fixed. It is sufficient to install the fixed contact rod 38 on the metal casing 20 before attaching the metal casing 20 to the insulating end plate 20. Moreover, the fixed electrical contactor 22 is sufficient to fix the fixed contact rod 38 to the fixed contact rod 38 after assembling the metal casing 20.

Seventhly, a vacuum force circuit breaker in which the parts are temporarily assembled is transferred to a vacuum furnace and heated to seal the brazing materials 40, 41, 42, 43, 44, 45 and 46 placed between the components. Solder So the vacuum breaker is completed. In consideration of the wetness of the brazing material, the heating temperature is preferably higher than the temperature at which plastic deformation of the metal casing 20 starts.

As will be apparent from the above description, the vacuum breaker of the present invention forms a circular hole 24 in the center of the insulating end plate 19 of equal thickness, and the insulating end plate 19 is opened around the outer circumference of one end surface. The end portion 25 is characterized in that it is formed. Therefore, the insulating end plate of the present invention can make the formation and sintering extremely simple, and furthermore, this type of insulating end plate has an improvement in reducing the accuracy of casting and the amount of material.

In order to improve the accuracy of assembly in consideration of the insulating end plate 19 of the ceramic material which is easy to break and difficult to manufacture a machine, it is sufficient to manufacture the circular hole 24 and the end portion 25 by machine. Therefore, cutting or machining work for casting is simple and the mechanical manufacturing cost is reduced to the minimum possible.

The metal layers 26 and 27 formed on the insulating end plate 19 for joining the arc shield member 30 and the metal casing 20 are formed on one end surface thereof and have a flat surface. Therefore, the metallization process can be facilitated.

The metal casing is formed of Fe-Ni-CO alloy or Fe-Ni alloy, which has the same coefficient of thermal expansion as ceramics. So even if the coefficients are not intermediate, they can be connected directly.

Since the metal casing 20 is formed in a tubular shape and an extension portion 29 having an end portion bent outward is formed in the opening, the heat deformation force during brazing is absorbed by the extension portion 29. Can be.

Therefore, there is some possibility that the thermal strain force remains during brazing. Moreover, undesirable deformation force is not applied to the insulating end plate 19. Therefore, there is no possibility that the insulating end plate 19 will be damaged. Since the metal casing 20 is fixed to the periphery of the opening of the extension portion 29 on the end portion 25 on which the metal layer 26 is formed, it is easy to locate the insulating end plate 29. Moreover, the batching operation can be performed accurately.

Furthermore, since the extension portion 29 is formed in the opening of the vacuum vessel 21 which is hermetically brazed after the arrangement, it can withstand the pressure difference between the inside and outside of the vacuum vessel and also the impact at the time of input and interruption. The creepage distance of the insulation end plate 19 between the arc shield member 30 and the metal casing 20 in the vibrating vessel 21 can be enlarged.

Since the arc shield member 30 is made of Fe-Ni-CO alloy or Fe-Ni alloy, which is a thermal expansion coefficient, such as the ceramic forming the insulation end plate 19, the arc shield member 30 directly insulates the end plate. It can be brazed to (19).

Since the arc shield member 30 has a cylindrical shape and an annular fixing portion 32 extending from the opening in the axial direction is fixed to the hole 24, it is disposed on the insulating end plate 19 and temporarily assembled when provisionally assembled. It becomes easy and accurate. When brazing in a vacuum furnace, the brazing material flowed into the gap between the circular hole 24 and the annular fastening portion 32.

The entire surface of the bottom portion of the arc shield member 30 is attached to the insulating end plate 19.

The small area of the bottom portion located outside the annular fixing portion 32 is partially fixed to the insulating end plate 19. As a result, the bottom portion of the arc shield member 30 on both sides of the fixing portion is deformed by the thermal deformation force when brazing so that the connection between the insulating end plate and the shield is sufficiently relaxed even in the frontal contact state. It is. As a result, sufficient hermetic brazing operation can be performed.

Furthermore, when input, the knot is a slight current flowing through the arc shield member 30 connected to the movable contact rod 35 through an electrically resistive material or an inconel stainless steel bellows. Thus, the temperature cannot be raised by the current flowing through it. Therefore, it is possible to effectively catch the metal vapor generated at the time of blocking, thereby bringing about good blocking.

Arrangement and provisional fastening of the bellows 33 on the insulating end plate 19 can be simplified, and the cylindrical extension portion 34 provided in the opening can be precisely fixed by fixing to the fixing portion 32 of the arc shield member 30. Can be implemented.

The bellows 33 is configured to be connected to the insulating end plate 19 through the arc shield member 30, so that it does not need to interfere with additional means having an intermediate coefficient of thermal expansion. Furthermore, if the outer surface of the metal casing 20 and the end of the extension of the annular fastening portion 32 of the arc shield member 30 are coated with paint, the metal casing 20 and the Fe-Ni- are applied. The arc shield member 30 composed of a CO alloy or a Fe-Ni alloy may be prevented from being rusted because it is not directly exposed to air. FIG. 6 is a partial sectional view showing a second embodiment of the vacuum force circuit breaker in which the shape of installing the fixed and movable contactors 22 and 23 to the fixed and movable contact rods 38 and 35 is partially changed. to be.

The movable contact rod 35 is arranged to insert a hole 36 formed in the bottom portion of the bellows 33. In more detail, the movable contact rod 35 is supported and hermetically connected to an annular flange 47 formed to be a single body at the top of the bellows 33. A caulking portion 48 is formed in connection with the outer circumference of the recess 37.

The recess 37 is formed with a caulking portion 48 around its inner side. The movable electrical contactor 23 is fixed to the concave 37 of the movable contact rod 35 so that the concave hole 49 formed in connection with the outer circumferential surface coincides with the concave portion 48 of the concave 37. Will be. The movable electrical contactor 23 heats the brazing material 42 provided between the bottom portion of the recess 37 and the movable electrical contactor 23 and is fixed to the movable contact rod 35. The fixed contact rod 38 is provided along the outer periphery of the recess 39 with the caulking portion 51 on the outer circumferential surface. The fixed electrical contactor 22 forming the hole 52 of the caulking is fixed to the concave 39 and between the hole 52 of the caulking and the caulking portion 51 formed along the inner periphery of the concave 39. Secured by contact The fixed electrical contactor 22 is brazed to the fixed electrical contactor 23 by heating the brazing material 45 provided between the bottom portion of the recess 39 and the fixed contact rod 38.

The rest of the structure of this embodiment is the same as that of the second embodiment already described above, and thus description thereof is omitted.

In the embodiment of the vacuum force circuit breaker according to the second aspect of the present invention, the contactors 22 and 23 are provided with a gap between the electrical contacts 22 and 23 with respect to the fixed and movable contact rods 38 and 35. It is in contact with each recess 39. In brazing, the gaps fill the brazing material 45 (42). Thus, the strength of the connection can be enhanced and the electrical resistance can be reduced during the attraction.

FIG. 7 is a partial cross-sectional view showing the embodiment of FIG. 3 of the circuit breaker according to the present invention in which the outer radius of the fixed and movable electrical contacts 22, 23 is enlarged so as to cut off the breaking current for a large capacity.

The movable contact rod 35 inserted through the hole 36 (see FIG. 3) installed in the bottom portion of the bellows 33 has an upper end of the bellows 33 through the flange 47 installed in the adjacent portion of the axial end. Contact with The disk-shaped movable electrical contactor 23 having a radius larger than the radius of the outer radius of the movable contact rod 35 is fixed to the concave 53 provided at the axial end above the axial end of the movable contact rod 35. The movable electrical contactor 23 is brazed to the movable contact rod 35 by a brazing material 42 provided between the bottom portion of the recess 53 and the shaft portion of the movable contactor rod 35. A disk-shaped electrical contact 22 having a radius larger than the radius of the fixed contact rod 38 is fixed to the axial end of the fixed contact rod 38.

In more detail, the recess 54 provided in the electrical contactor 22 is in contact with the axial end of the fixed contact rod 38. The fixed electrical contactor 22 is formed at the axial end of the fixed contact rod 38 by a brazing material 45 provided between the fixed contact rod 38 and the bottom portion of the recess 54 provided in the fixed electrical contactor 22. It is brazed. Other structures are the same as those of the first embodiment and are omitted here.

While the current flowing through the electrical contactor defined in the third embodiment is substantially the same as the first and second embodiments, the electrical contactor of the third embodiment is capable of producing a large current compared to the first and second embodiments. Allow to block.

8 is a fourth embodiment of the present invention characterized in that the guide portion 55 is provided on the movable contact rod 35 in the extension portion of the annular fixing portion 32 of the arc-shield member 30. It is sectional drawing which shows a circuit breaker.

In more detail, the guide portion 55 is shaped like a B and extends from the end of the flat portion 55a extending vertically inwardly with respect to the axial line of the vacuum air 21 and the flat portion 55a parallel to the axial direction. The extended annular portion 55b is formed. The flat portion 55a of the guide portion 55 is installed inwardly away from the outer surface of the insulating end plate 19. The inner radius of the portion 55b is larger than the inner radius of the movable contact rod 35. The remaining structure is substantially the same as that of the fourth embodiment, and thus will be omitted.

According to a fourth embodiment of the vacuum force circuit breaker according to the present invention, when the movable contact rod 35 is connected to an operation unit (not shown), even if an external force is applied to the outer end of the movable contact rod 35, the oscillation is performed. Since the swing is limited by the annular part 55b of the guide part 55, it becomes the first possible. There is no possibility that the movable contact rod will swing or a displacement between the axial line of the movable contact rod and the linkage rod of the operating unit will occur. Therefore, there is no possibility that the bearing capacity of the bellows 33 may fall. Moreover, there is no possibility that the electrical contacts 22, 23 are in partial contact with each of the stationary and movable electrical contacts.

In addition, there is no deterioration in electric current efficiency due to the reduction of the contact area. Moreover, no additional bearing is required.

When assembling the vacuum circuit breaker temporarily, the positioning of the bellows 33 in the axial direction can be determined by contacting the end of the extended portion 34 of the bellows 33 with the flat portion 55a of the guide portion 55. do. The length of the extension portion 34 in the axial direction is longer than that of the annular fixing portion 32 of the arc shield member 30 so that the bellows 33 can be effectively used.

FIG. 9 is a partial sectional view showing the fourth embodiment of the vacuum force circuit breaker, wherein the arc shield member 30 has a double end formed at its bottom portion. In more detail, in the adjacent portion of the bottom portion of the arc-shield member 30, the inner portion of the bent portion 57 is substantially parallel to the bottom portion 31 which is substantially the same as the outer radius of the bellows 33. A bent portion 57 with 56 is formed. The extended portion 34a provided at the bottom of the bellows 33 extending in the axial direction is fixed to the inner circumferential surface of the bent portion 57 of the arc shield member 30 and is brazed to be sealed. When temporarily assembled, the bellows 33 is placed in contact with the inner circumferential surface of the extended portion 34a so as to be flush with the vacuum vessel 21. Positioning in the axial direction is carried out by bringing the end of the extended portion 34a into contact with the bottom portion 31 of the arc shield member 30. The rest of the structure is substantially the same as that of the first embodiment, and thus will be omitted. The vacuum force circuit breaker defined in the fifth embodiment has an arc in the vacuum vessel as compared with the one defined in the first embodiment because the arc shield member 30 is provided with a double end portion at the bottom thereof. The creepage distance between the metal casing 20 of the shield member 30 can be enlarged.

Positioning in the radial and axial directions secures the extension 34a of the bellows to the inner circumferential surface of the bent portion 57 of the arc-shield member 30 and the end of the bent portion 57 to the arc-shield. It is performed correctly by making the outer end of the inner surface of the bottom part 31 of the member 30 contact. The connecting end portion (brazing portion) of the insulating end plate 19 of the arc shield member 30 is separated from the annular fixing portion 32.

The bottom portion 31 of the arc shield member 30 except for the connecting portion, that is, the short powder 56 is completely separated from the insulating end plate 19. The arc shield member 30 is provided with the aforementioned bent portion 57.

Such a structure makes it possible to absorb or alleviate the thermal strain due to brazing.

FIG. 10 shows that the insulating end plate is formed of an annular disc and is formed of an annular disc of a metal casing without preparing an end portion that is soft around one unit of the insulating end plate, and the outside of the insulating end plate 19 around the opening of the metal casing. A cross section of a sixth embodiment of a vacuum force circuit breaker, characterized in that an end portion to be secured around is formed.

In this vacuum circuit breaker, a disk-shaped plate having a circular hole 24 is formed around the insulating end plate 19a of the ceramic material. There is a metal plate 26b with a predetermined width connected to the outer circumferential surface of one end of the insulating end plate. The metal casing 20 having the extension portion 29 is fixed to the insulating end plate 19 so that the opening portion secures the outer periphery of the insulating end plate 19a and the end portion formed at the adjacent portion of the extension portion 29. 28 is in contact contact fixation with the metal layer 26b. The vacuum vessel 21 is constructed by brazing the metal layer 26b and the end portion 28 in a hermetic manner. The width of the metal layer 26b is smaller than the width of the end portion of the metal casing 20. The remaining structure is the same as that of the fifth embodiment described above, and thus will be omitted.

In the vacuum force breaker according to the sixth embodiment, since the insulating end plate 19a is formed of a disc-shaped plate, the vacuum breaker becomes simpler to form and sinter than the first to fifth embodiments.

The vacuum force circuit breaker of the sixth embodiment improves the accuracy of the casting and eliminates the mechanical process.

This vacuum force circuit breaker further makes it possible to precisely metallize the portion connecting the metal casing 20 and the arc shield member 30. When assembling the metal casing 20 with the insulating end plate 19a, the opening of the extension portion of the metal casing 20 is fixed to the circumferential surface of the insulating end plate 19a, and the end portion 28 is attached to the metal layer of the insulating end plate 19a. Contact with (26b). Thus, such a structure makes it possible to precisely position and tentatively attach the metal casing 20 in the radial and axial directions with the insulating end plate 19a. The width of the metal layer 26b on the insulating end plate 19a is smaller than the width of the end portion 28 of the metal casing 20.

The bent portion curved to form the end portion 28 and the opening edges of the extension portion 29 of the metal casing 20 are configured to be deformed. Therefore, it is possible to absorb or alleviate the thermal strain at the time of brazing and the impact at the time of input and interruption.

FIG. 11 is characterized in that the bellows is installed so that the bellows shield member 58 is prevented from being damaged by metal electricity generated when the movable electrical contactor 23 contacts or falls off the fixed electrical contactor 22. FIG. A partial cross-sectional view showing a vacuum force circuit breaker according to the embodiment of 7.

In the vacuum force circuit breaker of this type, the bellows shield member 58 is provided in the center together with the conical hole 59. The bellows shield member 58 is fixed to the movable contact rod 35 such that the conical hole 59 is in contact with the outer circumferential surface of the movable contact rod.

As a result, the bellows shield member 58 is brazed to the top of the movable contact rod 35 and the bellows 33 to be hermetically sealed.

Since the inner radius of the conical hole 59 is slightly larger than the outer radius of the movable contact rod 35, the brazing material flows toward the bellows 33. Since the outer radius of the bellows shield member 58 is smaller than the inner radius of the arc shield member 30, the metal vapor cannot enter the bellows 33. The remaining structure is the same as that of the first embodiment and is omitted here.

In the vacuum force interrupter of this first embodiment, the inner radius of the conical hole 59 of the corrugated barrel is slightly larger than the outer radius of the movable contact rod 35. This facilitates the installation in the radial direction and makes it possible to carry out accurately. Furthermore, the gap between the inner surface of the shield member 30 and the vertical surface of the bellows shield member 58 is minimized as much as possible.

The brazing operation is performed under the condition that the annular brazing material is arranged in contact with the movable contact rod 35. Therefore, it is possible to combine the bellows 33, the movable contact rod 35 and the bellows shield member 58 by the brazing material 60 at the same time.

Since the brazing material 60 penetrates between the conical hole 59 and the movable contact rod 35, the connection strength is increased.

FIG. 12 is a partial sectional view showing the vacuum force breaker of the seventh embodiment in which the bellows shield member 61 is improved to operate even when the amount of metal vapor generated by the increase in the breaking current capacity is increased. .

Since the bellows shield member 61 of Fe-Ni-Co alloy or Fe-Ni alloy is brazed to the flange portion of the movable contact rod 35 in the case of the conical hole 62, the bellows shield member 61 is fixed. The open end of the shield member 30 is installed in the bottom portion 31 of the shield member 30.

The rest of the structure is practically the same as in the third embodiment and is omitted here.

The bellows 33 can be protected in the case of a large amount of metal vapor generated when the large-capacity interruption of the current is blocked by the vacuum breaker defined in the eighth embodiment.

FIG. 13 is a partial sectional view showing a vacuum force circuit breaker according to the ninth embodiment in which the fixed contact rod 38 is connected to the metal casing 20 through an auxiliary end plate for collecting current indicated by the numeral 63. FIG. .

As shown in FIG. 13, the auxiliary end plate 63 made of Cu or Cu alloy includes a downwardly protruding annular fixing portion 64 which is provided at its center.

The auxiliary end plate 63 is fixed to the bottom of the metal casing 20 so that the outer circumferential surface of the fixing portion 64 is fixed to the circular hole 20a of the metal casing 20. And it is hermetically brazed there. The terminal 65 connected to the power source or the load is mechanically and battery-connected to the auxiliary end plate 63 '. In more detail, the auxiliary end plate 63 further includes a hole 66 formed in the center thereof, through which the fixed contact rod 38 is inserted.

Thus, the fixed contact rod 38 is fixed to the auxiliary end plate 63 so that the plan 38a formed as a single body on the fixed contact rod 38 is supported by the peripheral portion of the auxiliary end plate 63 and brazed.

The above-described terminal 65 is fixed to the outer circumferential surface of the auxiliary end plate 63 on the circumferential surface of the fixed contact rod 38 and screwed into and fixed with the fixed contact rod 38 through the washer 67. 68). The rest of the structure is substantially the same as in the first embodiment and is omitted here.

Therefore, the vacuum force circuit breaker defined in the embodiment described in the end makes it possible to reduce the connection resistance when the fixed contact rod 38 is connected to the end 65.

It will be appreciated that modifications and various embodiments of the invention disclosed herein may be adjusted without departing from the spirit and added scope of the invention.

Claims (1)

An insulating cylindrical insulating end plate 19 of ceramic material, a bell-shaped metal casing 20 having the same coefficient of thermal expansion as that of the ceramic material, fixed to the outer periphery of the insulating end plate 19 and hermetically sealed and brazed; There is a fixed electrical contact 22 at one end and includes a fixed contact rod 38 extending in the axial direction of the metal casing, and at one end there is a movable electrical contact rod 35 and with the fixed contact rod 38. The movable contact rod 35 arranged in a line and operating in correspondence with the fixed contact rod also has a vacuum force composed of a vacuum vessel 21 disposed in the vacuum vessel to surround the fixed and movable electrical contacts 22 and 23. In the circuit breaker, the insulating end plate 19 is provided at the center of the end plate in which the circular hole 24 is formed; The movable contact rod (35) is disposed to extend through the circular hole (24) in the axial direction of the vacuum vessel (21); The arc shield member 30 is provided at one end thereof with an annular fastening portion 32 fixed into the circular hole 24 of the end plate; In addition, the bellows 33 has an annular axially extending portion 34 formed at an open end thereof, and is disposed between the movable contact rod 35 and the arc shield member 30, and one end of the bellows 33 One end of the movable contact rod 35 is hermetically brazed to an adjacent portion, and the other end thereof is hermetically sealed to the inner surface of the annular fixing portion 32 of the arc shield member 30. Vacuum breaker.