JP5580362B2 - Power distribution equipment - Google Patents

Description

  The present invention relates to power distribution equipment such as circuit breakers and switches.

  Power distribution equipment such as a circuit breaker and a switch includes a fixed electrode and a movable electrode that is energized by being brought into contact with the fixed electrode. The movable electrode is rotatably supported. And a power distribution apparatus makes a fixed electrode contact by rotation to the injection | throwing-in direction of a movable electrode, and separates a fixed electrode by rotation to the open direction of a movable electrode. Thereby, the power distribution apparatus opens and closes the electric circuit. The movable electrode is set so as to be in a predetermined contact position (set insertion position) with the fixed electrode at the time of insertion.

  However, the movable electrode may cause a so-called overrun that passes the contact position with the fixed electrode when rotating in the closing direction due to deflection or dimensional error of components or cases of power distribution equipment. And when a movable electrode overruns, there exists a possibility that a movable electrode may contact components, such as a fixed electrode and an arc-extinguishing chamber, and may each be damaged. Therefore, in order to suppress damage due to this overrun, a power distribution device has been proposed in which a buffer member is provided below a contact blade provided on a fixed electrode (for example, Patent Document 1). In the power distribution device, since the buffer member is located in the direction in which the movable electrode is inserted, the buffer member prevents the movable electrode from moving and prevents overrun.

JP 2002-208332 A

  By the way, in the power distribution device described in Patent Document 1, when the movable electrode is vigorously inserted, the movable electrode rebounds by the buffer member, thereby causing chattering in which the movable electrode vibrates and repeats intermittent connection with the fixed electrode. There was a fear. When chattering occurs, an arc is generated each time chattering occurs, and the contact surface is roughened or consumed, resulting in increased contact resistance.

  Further, when the structure of the power distribution device described in Patent Document 1 is used for a movable electrode composed of two contact blades, when the movable electrode comes into contact with the buffer member, the distance between the two contact blades increases, and the fixed electrode There is a risk that the pressure on the contact surface will decrease. Therefore, there has been a demand for a power distribution device that can prevent chattering of the movable electrode and can secure a contact surface pressure between the movable electrode and the fixed electrode.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a power distribution device capable of preventing chattering of the movable electrode and ensuring contact surface pressure between the movable electrode and the fixed electrode.

Hereinafter, means for achieving the above-described object and its operation and effects will be described.
The invention according to claim 1 includes a fixed electrode and a movable electrode composed of two contact blades rotatable with respect to the fixed electrode, and the movable electrode is closed by contacting the fixed electrode. The power distribution device includes a buffer member that collides with the movable electrode at a position on the extension line of the movable range of the movable electrode and past the fixed electrode in the direction of transition from the open circuit state to the closed circuit state. The gist is that the member is formed with an inclined surface that displaces the contact blades in a direction in which the contact blades approach each other when the contact blades come into contact with each other.

  According to this configuration, when the movable electrode passes the fixed electrode at the time of insertion, the contact blade collides with the buffer member. And when a contact blade collides with the inclined surface of a buffer member, it will be displaced to the direction in which contact blades adjoin. For this reason, when the contact blades come close to each other, the contact surface pressure against the fixed electrode increases, and the contact blade is sandwiched between the fixed electrodes. Therefore, chattering of the movable electrode can be prevented, and the contact surface pressure between the movable electrode and the fixed electrode can be ensured.

  According to a second aspect of the present invention, in the power distribution device according to the first aspect, the inclined surface is formed to extend in the extending direction of the contact surface when the contact blade and the inclined surface are in contact. The gist of this is.

  According to this configuration, since the inclined surface is formed so as to extend in the extending direction of the contact surface of the contact blade at the time of contact, the contact blade and the inclined surface are securely contacted, and the shock absorbing member absorbs the shock. And the reaction force can be efficiently applied.

The gist of the invention according to claim 3 is that, in the power distribution device according to claim 1 or 2, shock absorbing portions are formed on both sides of the inclined surface of the buffer member.
According to this configuration, the shock absorbing portion can absorb the impact when the contact blade comes into contact, and the buffer member can be prevented from being damaged.

  According to a fourth aspect of the present invention, in the power distribution device according to any one of the first to third aspects, the buffer member includes an engagement portion that engages with an engagement hole provided in the power distribution device main body. The gist of the invention is that the engaging portion is formed with an engaging convex portion that is locked to a member in which the engaging hole is formed, and a notch portion that reduces the physique when inserted into the engaging hole. It is said.

  According to this configuration, since the buffer member includes the engaging portion that engages with the engagement hole, the buffer member can be easily attached to the power distribution device main body. Moreover, it can be reliably latched by the engaging convex part, and when engaging, it can be easily inserted into the engaging hole by reducing the physique toward the notch part.

  According to the present invention, in the power distribution device, chattering of the movable electrode can be prevented and the contact surface pressure between the movable electrode and the fixed electrode can be ensured.

The figure which shows the internal structure of the multicircuit switch which installed the buffer member. The top view which shows the clamping of a fixed electrode and a movable electrode. The side view which shows the attachment state of a buffer member. The bottom view which shows the attachment state of a buffer member. The front view which shows the attachment state of a buffer member. 6-6 sectional drawing which shows contact | abutting with a movable electrode and a buffer member. The figure which shows the shape of a buffer member. The figure which shows the shape of a buffer member. The figure which shows the internal structure of the switch provided with the buffer member.

Hereinafter, an embodiment in which a power distribution device according to the present invention is embodied as a multi-circuit switch will be described with reference to FIGS.
As shown in FIG. 1, the multi-circuit switch has a plurality of circuit switching units 10 arranged in parallel. Here, only one circuit is shown. The circuit opening / closing part 10 is supported by a box-shaped main body case 11.

  Between the side plates of the main body case 11, an upper support plate 12 and a lower support plate 13 are installed on the upper side and the lower side, respectively. An upper support member 21 that supports the movable electrode 20 is fixed to the upper support plate 12 with bolts (not shown). A lower support member 31 that supports the fixed electrode 30 is fixed to the lower support plate 13 with bolts (not shown). Both support members 21 and 31 are formed of a synthetic resin material having insulation and strength. The lower support plate 13 corresponds to a power distribution device main body.

  A housing recess 21 a for housing the upper connection terminal 23 is formed in the lower end side central portion of the upper support member 21. The upper connection terminal 23 is fixed to the upper end portion of the upper support member 21 so that the lower end portion protrudes into the storage recess 21a. A movable electrode 20 is rotatably supported by a rotation shaft 24 at the lower end portion of the upper connection terminal 23. An arc resistant metal 20 c is fixed to the lower end of the movable electrode 20.

  As shown in FIG. 2, the movable electrode 20 includes two contact blades 20 a and 20 b, and the two contact blades 20 a and 20 b are attached with the upper connection terminal 23 interposed therebetween. The two contact blades 20a and 20b are urged toward the side where the contact blades 20a and 20b come close to each other while the interval between the contact blades 20a and 20b is set by the regulating member 26.

  As shown in FIG. 1, a metal main shaft 14 is rotatably mounted on the upper portion of the main body case 11. A drive lever 15 is fixed to the main shaft 14. The drive lever 15 rotates on the main shaft 14. A main shaft 14 is connected to a base end portion of the drive lever 15, and an operation link 17 is rotatably connected to a distal end portion of the drive lever 15 by a connecting shaft 16. And the movable electrode 20 which consists of two contact blades 20a and 20b is connected with the front-end | tip part of the action | operation link 17 so that rotation is possible. That is, when the driven lever connected to the connecting shaft 16 is operated, the connecting shaft 16 moves, so that the movable electrode 20 is rotated by the link mechanism including the drive lever 15 and the operating link 17.

  The upper end portion of the upper connection terminal 23 is exposed on the upper surface of the upper support member 21. A conductive metal common bus 25 is fixed to the upper end of the upper support member 21 with bolts 22. The common bus 25 extends in a straight line in the direction connecting the circuit opening / closing sections 10.

  On the other hand, an accommodation recess 31 a for accommodating the lower connection terminal 33 is formed in the upper end side central portion of the lower support member 31. The lower connection terminal 33 is fixed to the lower end portion of the lower support member 31 so that the upper end portion protrudes into the storage recess 31a. The upper end portion of the lower connection terminal 33 functions as the fixed electrode 30. The width of the fixed electrode 30 is set slightly longer than the interval (separation distance) between the two contact blades 20a and 20b. The two contact blades 20a and 20b are sandwiched between the fixed electrode 30 and a predetermined contact position (set insertion position) when being inserted. At this time, the two contact blades 20a and 20b are set to contact the fixed electrode 30 with a predetermined contact surface pressure. An arc-resistant metal 30a is fixed to the fixed electrode 30 at a portion that first contacts the movable electrode 20 at the time of charging.

  An arc extinguishing device 18 is attached to the upper portion of the lower support member 31. In the arc extinguishing device 18, a plurality of magnetic plates stacked at predetermined intervals along the rotation direction of the movable electrode 20 are supported by a support member. The magnetic plate has a U-shaped notch through which the movable electrode 20 passes. The arc extinguishing device 18 can extinguish the arc between the movable electrode 20 and the fixed electrode 30 when the movable electrode 20 changes from the input state to the open circuit state.

  A lower end portion of the lower connection terminal 33 has a connection conductor 34 fixed by a bolt 32 and is connected via a connection conductor 34 to a bushing (not shown) protruding from the lower front surface of the main body case 11.

  The lower support plate 13 is provided with a buffer member 40 on the extension of the movable electrode 20 in the rotational direction. The buffer member 40 is positioned between the upper end portion of the fixed electrode 30 and the lower support plate 13 and is positioned directly below the upper end portion of the fixed electrode 30. When the movable electrode 20 has passed the set input position with the fixed electrode 30, the buffer member 40 abuts the tip of the movable electrode 20 and restricts rotation. The buffer member 40 is set so that the movable electrode 20 contacts the center of the inclined surfaces 46 and 47 of the buffer member 40. The buffer member 40 is formed of an insulating and elastic resin material.

  As shown in FIGS. 3 and 4, the bottom of the buffer member 40 is provided with an engagement portion 41 having a long cylindrical shape. The engagement portion 41 of the buffer member 40 is engaged with an oval engagement hole 13 a formed in the lower support plate 13. The long side direction of the engaging portion 41 is provided in the installation direction of the movable electrode 20. Both side surfaces in the longitudinal direction of the engaging portion 41 are formed in a tapered shape that becomes smaller toward the lower end. On both side surfaces of the bottom portion of the engaging portion 41, a pair of engaging convex portions 42 protruding from the long side are provided. The engaging convex part 42 is formed in a substantially triangular prism shape extending along the long side. The buffer member 40 is engaged with the lower support plate 13 by a pair of engaging convex portions 42. A notch 43 is formed in the center of the bottom of the engaging portion 41 along the long side direction. On the side surface of the engaging portion 41, a ridge 44 is formed on the entire circumference.

  As shown in FIG. 5, the buffer member 40 bends the bottom portion of the engaging portion 41 toward the cutout portion 43, so that the shape of the engaging portion 41 in the short side direction becomes the size of the engaging hole 13a. In the contracted state, it is inserted into the engagement hole 13 a of the lower support plate 13. Then, when the engagement protrusion 42 passes through the engagement hole 13 a of the lower support plate 13, the diameter of the engagement protrusion 42 is restored and locked to the bottom surface of the lower support plate 13. Here, in order to perform reliable locking between the engaging convex portion 42 and the lower support plate 13 and confirmation of locking, the engaging portion bent by inserting a flathead screwdriver or the like into the notch 43. The bottom of 41 is forcibly expanded in diameter. Thereby, the engagement convex part 42 will expand rather than the engagement hole 13a of the lower side support plate 13, and the engagement convex part 42 can be latched to the bottom face of the lower side support plate 13. FIG. Further, the ridge 44 on the side surface of the engaging portion 41 is in close contact with the inner surface of the engaging hole 13 a of the lower support plate 13. The notch 43 functions as a confirmation groove.

  As shown in FIGS. 3 and 5, an inclined recess 45 that abuts the tip of the movable electrode 20 is formed on the upper portion of the buffer member 40. The inclined recess 45 is formed along the extending direction of the contact surface 20d of the contact blades 20a and 20b, and is inclined so that the fixed electrode 30 side is lower than the movable electrode 20 side. The inclination angle of the inclined recess 45 is set to an angle parallel to the contact surface 20d of the movable electrode 20 when the movable electrode 20 is in contact. Thereby, the front-end | tip of the movable electrode 20 can contact | abut on the line | wire with the buffer member 40 reliably.

  As shown in FIG. 5, inclined surfaces 46 and 47 are formed in the inclined recess 45, and a bottom surface 48 is formed between the inclined surfaces 46 and 47. The inclined surfaces 46 and 47 are contact portions of the movable electrode 20, and the inclined surfaces are formed in a direction in which the two contact blades 20a and 20b are close to each other. That is, the inclined surfaces 46 and 47 are inclined inward toward the bottom surface 48. The contact blades 20a and 20b that are in contact with the inclined surfaces 46 and 47 receive an inward reaction force and slide toward the bottom surface 48, so that the contact blades 20a and 20b come close to each other. Note that only one of the inward reaction force and the slip toward the bottom surface 48 side may act. The inclination angles of the inclined surfaces 46 and 47 are arbitrarily set in the inner direction. On both sides of the inclined surfaces 46 and 47 of the buffer member 40, a shock absorbing portion 49 extending to the side is formed. Both shock absorbing portions 49 contribute to shock absorption when contacting the movable electrode 20.

  Next, the operation of the buffer member 40 when the movable electrode 20 is inserted will be described with reference to FIG. Here, a description will be given assuming that the movable electrode 20 has rotated more than the set input position in the input direction. If the contact surface pressure is ensured even if the movable electrode 20 slightly deviates from the setting input position, it is possible to energize without any problem.

  As shown in FIG. 6, when the movable electrode 20 is thrown toward the fixed electrode 30, the fixed electrode 30 is sandwiched between the two contact blades 20 a and 20 b and contacts each side surface of the fixed electrode 30. To do. When the movable electrode 20 is rotated more than necessary in the closing direction, the movable electrode 20 abuts the inclined surfaces 46 and 47 of the inclined recess 45 of the buffer member 40 after passing the set charging position. The contact blades 20 a and 20 b that are in contact with the inclined recess 45 receive a reaction force toward the bottom surface 48 due to the inclination angle of the inclined surfaces 46 and 47. The contact blades 20a and 20b are displaced inward by the reaction force received from the inclined surfaces 46 and 47, so that the contact blades 20a and 20b come close to each other. When the contact blades 20 a and 20 b come close to each other, the contact surface pressure with respect to the fixed electrode 30 increases, and the contact blades 20 a and 20 b are in contact with the fixed electrode 30. Therefore, chattering of the movable electrode 20 can be prevented and a contact surface pressure between the movable electrode 20 and the fixed electrode 30 can be secured.

As described above, according to the embodiment described above, the following effects can be obtained.
(1) When the movable electrode 20 is inserted, if the movable electrode 20 passes the fixed electrode 30, the contact blades 20 a and 20 b come into contact with the inclined surfaces 46 and 47 of the buffer member 40. When the contact blades 20a and 20b come into contact with the inclined surfaces 46 and 47 of the buffer member 40, the contact blades 20a and 20b are displaced in a direction in which the contact blades 20a and 20b come close to each other. For this reason, when contact blade 20a, 20b adjoins, the contact surface pressure with respect to the fixed electrode 30 will increase, and the contact blade 20a, 20b will pinch | interpose to a fixed electrode. Therefore, chattering of the movable electrode 20 can be prevented and a contact surface pressure between the movable electrode 20 and the fixed electrode 30 can be ensured.

  (2) Since the inclined surfaces 46 and 47 are formed so as to extend in the extending direction of the contact surface 20d of the contact blades 20a and 20b at the time of contact, the contact blades 20a and 20b and the inclined surfaces 46 and 47 are securely connected. The shock absorber 40 can absorb the impact and apply the reaction force.

  (3) Since the buffer member 40 includes the engagement portion 41 that engages with the engagement hole 13 a of the lower support plate 13, the buffer member 40 can be easily attached to the lower support plate 13. In addition, since the engaging convex portion 42 is provided in the engaging portion 41, the engaging convex portion 42 can be reliably locked to the lower support plate 13.

  (4) A notch 43 is formed in the center of the bottom of the engaging portion 41 along the long side direction. For this reason, when engaging, it can be easily inserted into the engagement hole 13a by reducing the physique toward the notch 43.

  (5) A confirmation member such as a flat-blade screwdriver is inserted into the notch 43, and the engaging convex part 42 bent toward the notch 43 can be expanded to be surely locked. Moreover, it can confirm that the engagement convex part 42 is engaging.

  (6) The engaging portion 41 is formed in a long cylindrical shape, the long side direction of the engaging portion 41 is provided in the installation direction of the movable electrode 20, and the oval engaging hole 13 a formed in the lower support plate 13. To engage. For this reason, the contact blades 20a and 20b can be prevented from being displaced and detached due to an impact at the time of contact with the inclined surfaces 46 and 47 of the buffer member 40. Further, both side surfaces in the longitudinal direction of the engaging portion 41 are formed in a tapered shape that becomes smaller toward the lower end. For this reason, it can be easily inserted into the engagement hole 13 a of the lower support plate 13.

  (7) The ridge 44 is formed on the entire side surface of the engaging portion 41. For this reason, when the engaging portion 41 is locked to the lower support plate 13, the protruding portion 44 is in close contact with the inner surface of the engagement hole 13 a of the lower support plate 13. It is possible to securely engage the thirteen engagement holes 13a.

  (8) Shock absorbing portions 49 are formed on both sides of the inclined surfaces 46 and 47 of the buffer member 40. For this reason, the impact absorbing portion 49 absorbs the impact when the contact blades 20a and 20b are in contact with each other, and the buffer member 40 can be prevented from being damaged.

In addition, the said embodiment can be implemented with the following forms which changed this suitably.
In the above-described embodiment, the inclined recess 45 is constituted by the inclined surfaces 46 and 47 and the bottom surface 48, but the shape can be changed if the inclined surfaces 46 and 47 that contact the contact blades 20a and 20b are provided. For example, as shown in FIG. 7, an inverted triangular inclined recess 45 in which both inclined surfaces 46 and 47 are connected to the buffer member 40 may be provided. In addition, as shown in FIG. 8, the buffer member 40 may be provided with an inclined concave portion 45 having a convex portion 50 that separates both inclined surfaces 46 and 47.

  In the above embodiment, the buffer member 40 is provided in the multi-circuit switch. However, the buffer member 40 may be provided not only in the multi-circuit switch but also in other power distribution devices such as a switch. For example, as shown in FIG. 9, a power supply side bushing 62 is penetrated and fixed to the power supply side surface 61 of the main body case 60 of the switch, and a load side bushing 64 is fixed to the load side surface 63. . A fixed electrode 65 protrudes and is fixed to the power supply side bushing 62. On the other hand, a connection terminal 66 protrudes and is fixed to the load side bushing 64, and a movable electrode 67 is rotatably attached to the tip of the connection terminal 66. A support member 68 extending in the extending direction of the fixed electrode 65 is attached to the power supply side bushing 62. At the tip of the support member 68, the buffer member 40 is installed on the extension of the movable electrode 67 in the rotational direction. In the buffer member 40, when the movable electrode 67 has passed the set input position with the fixed electrode 65, the contact surface of the movable electrode 67 contacts and restricts the rotation of the movable electrode 67.

  -In above-mentioned embodiment, although the engaging part 41 engaged with the engaging hole 13a was provided in the buffer member 40, you may abbreviate | omit the engaging part 41. FIG. In this case, for example, the buffer member 40 may be directly tightened with a screw.

  In the above embodiment, the inclined surfaces 46 and 47 of the buffer member 40 are formed at the same angle as the contact surfaces 20d of the contact blades 20a and 20b at the time of contact, but may be arbitrarily set.

  DESCRIPTION OF SYMBOLS 10 ... Opening and closing part, 11 ... Main body case, 12 ... Upper side support plate, 13 ... Lower side support plate, 13a ... Engagement hole, 14 ... Main shaft, 15 ... Drive lever, 16 ... Connection shaft, 17 ... Actuation link, 18 An arc extinguishing device, 20 a movable electrode, 20a and 20b a contact blade, 20c an arc-resistant metal, 20d an abutting surface, 21 an upper support member, 21a a storage recess, 22 a bolt, 23 an upper connection terminal, 24 ... rotating shaft, 25 ... common bus bar, 30 ... fixed electrode, 30a ... arc-resistant metal, 31 ... lower support member, 31a ... storage recess, 32 ... bolt, 33 ... lower connection terminal, 34 ... connection conductor, DESCRIPTION OF SYMBOLS 40 ... Buffer member, 41 ... Engagement part, 42 ... Engagement convex part, 43 ... Notch part, 44 ... Projection strip part, 45 ... Inclination recessed part, 46, 47 ... Inclination surface, 48 ... Bottom face, 49 ... Shock absorption part .

Claims (4)

In a power distribution device having a fixed electrode and a movable electrode composed of two contact blades rotatable with respect to the fixed electrode, the movable electrode being closed by contacting the fixed electrode,
A buffer member that collides with the movable electrode at an extended line of the movable range of the movable electrode and past the fixed electrode in the direction of transition from the open circuit state to the closed circuit state,
The power distribution device, wherein the buffer member is formed with an inclined surface that displaces the contact blades in a direction in which the contact blades approach each other when the contact blades come into contact with each other. The power distribution device according to claim 1,
The said inclined surface is extended and formed in the extension direction of the contact surface at the time of contact | abutting with the said contact blade and the said inclined surface. Power distribution apparatus characterized by the above-mentioned. The power distribution device according to claim 1 or 2,
A power distribution device, wherein shock absorbing portions are formed on both sides of the inclined surface of the buffer member. In the power distribution apparatus as described in any one of Claims 1-3,
The buffer member includes an engagement portion that engages with an engagement hole provided in a power distribution device main body,
The engaging portion is formed with an engaging convex portion that is locked to a member in which the engaging hole is formed, and a notch portion that reduces the physique when inserted into the engaging hole. Power distribution equipment.

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