JP3418670B2 - Circuit breaker - Google Patents

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a circuit breaker having a cover for an accessory storage unit, and more particularly to a productivity at the time of manufacturing and an operability at the time of opening and closing the cover. It relates to an excellent circuit breaker. 2. Description of the Related Art A conventional circuit breaker is disclosed in
No. 111707 and the like. The circuit breaker disclosed therein has an accessory storage in each of the poles on both sides of the pole provided with the manual operation handle, and these accessory storages are provided with lids that can be individually opened and closed. These lids are slidably provided, and both sides on the side along the sliding direction of the lid are guided in a direction along the surface of the housing and in a direction to prevent detachment from the surface of the housing. [0003] The above prior art does not consider the productivity in manufacturing a circuit breaker and the operability when opening and closing a cover when attaching and detaching an attached device. The problem that the structure becomes complicated and the problem that the left and right lids must be opened individually and both sides of the lid are guided by L-shaped guides, the contact area between the lid and the housing is large, and the frictional resistance when opening and closing are large was there. An object of the present invention is to provide a circuit breaker which is excellent in productivity during manufacturing and operability when opening and closing a cover. In order to achieve the above object, the present invention provides at least a three-phase electric circuit, a contact for opening and closing the electric circuit, an opening and closing mechanism for the contact, and an operation of the opening and closing mechanism. A handle, an auxiliary device storage unit for storing at least one of an auxiliary device for transmitting information on the open / closed state of the contact to the outside and an external device for controlling the release of the open / close mechanism from the outside, the electric circuit and the contact And a housing for storing the opening / closing mechanism and the accessory storage unit, wherein the opening / closing mechanism and the operation handle are provided in one of the three-phase electric paths, and the accessory storage unit is at least one of the other. in the produced circuit breaker to be provided in two phases, covering the accessory storage section openably a cover formed in a substantially concave shape, the cover is of two sides parallel to concave shape straight Each of the line portions has an engagement portion that engages with the housing, the engagement portion is a first guide portion that guides the cover in a direction along a surface of the housing; A second guide portion for guiding the cover to prevent detachment from the surface of the housing , wherein the first guide portion has a concave parallel shape of the cover.
The second guide portion is formed at the inner edge portion of the two straight portions to be formed.
Are outside the straight portions on the two parallel sides of the concave shape of the cover.
It is formed on the edge . According to the present invention, the engaging portion guides the cover in a direction along the surface of the housing, and the second guide guides the cover to prevent the cover from being detached from the surface of the housing. It has a part. Further, according to the present invention, the first guide portion is formed on the inner edge of two parallel sides of the "concave" shape of the cover, and the second guide portion is formed on the two parallel sides of the "concave" shape of the cover. Are formed on the outer edge of the rim. An embodiment of the present invention will be described with reference to FIGS. In this embodiment, a current flowing through the main circuit 130 is detected by a current transformer 410 as overcurrent detecting means and supplied to an overcurrent detection / trip circuit 420, and when an overcurrent is detected, a preset overcurrent is detected. The overcurrent trip device 430 is driven based on the trip characteristic to open and close the opening / closing mechanism 1.
The present invention is applied to an electronic circuit breaker that performs tripping of 40. As shown in FIG. 7, the circuit breaker according to the present embodiment includes a power source side terminal 100, a power source side fixed conductor 106, switching contacts 108 and 112, a movable conductor 110, and a switching contact 11 as shown in FIG.
4, 128, a main circuit 130 reaching the load side terminal 120 via the load side fixed conductor 126, and switching contacts 108, 11
An opening / closing mechanism 140 for opening / closing 2, 114, 128; an overcurrent detecting means 410 for detecting an overcurrent from a current flowing through the main circuit 130; and an overcurrent detecting / tripping circuit connected to the overcurrent detecting means 410 An overcurrent trip device 430 that trips the opening / closing mechanism 140 by the output of 420 is provided. The circuit breaker of this embodiment is a three-pole circuit breaker as shown in FIG.
It is provided for each phase. Switching contacts 108, 112, 114, 1
28 is a movable conductor 110 driven by an opening / closing mechanism 140
Is a contact that opens and closes this electric circuit in accordance with the opening and closing operation of. In this embodiment, the main circuit 130 except for the power supply terminal 100 and the load terminal 120 is housed in a main circuit case 135 made of an insulator and is electrically insulated. The opening / closing mechanism has a manual operation handle 141, and the manual operation handle 141 is configured to be exposed on the surface 167a of the housing. Opening / closing mechanism 14
0 indicates that the overcurrent trip device 430 performs a shut-off operation when the current of the main circuit 130 exceeds a predetermined value,
Opening and closing of the contacts can also be performed by manual operation of the operation handle 141. In this embodiment, the movable conductor 110 of the central pole is mechanically connected to the opening / closing mechanism 140,
Open / close contacts 108, 112, 11 by N-OFF operation
4, 128 are turned ON / OFF. In addition, O of the opening and closing mechanism
The transmission member 115 for transmitting the N-OFF or trip operation to the movable conductor 110 is also formed of an insulating material.
Are also electrically insulated from the main circuit 130. In this embodiment, the housing 165 is the main body case 16.
6. The main circuit 130, the opening / closing mechanism 140, the overcurrent detection means 410, the overcurrent detection / release circuit 420, and the overcurrent release device 430 are divided into a main body cover 167 and a housing 165.
The knob portion of the manual operation operation handle (hereinafter referred to as “operation handle”) 141 stored in the opening and closing mechanism 140, the power supply terminal 100, and the load terminal 120 are exposed outside the housing 165. Attached device 300 having a function of transmitting information on the open / closed state of the contact to the outside or a function of controlling the tripping of the open / close mechanism from the outside is provided in two phases other than the phase provided with the open / close mechanism and the operation handle. It is stored in the attached device storage unit 200 and incorporated inside the circuit breaker.
Auxiliary devices having a function of transmitting information on the open / closed state of the contact to the outside include an alarm switch, an auxiliary switch, and the like. As an auxiliary device having a function of controlling the tripping of the switching mechanism 140 from the outside, an external device is provided. There are a voltage trip device that trips according to a signal, an undervoltage trip device, and the like. When the auxiliary device 300 such as an alarm switch and an auxiliary switch is mounted in the auxiliary device storage unit 200, information on the open / closed state of the contact is detected by the operation of the lever 310 connected to the rotating shaft of the movable conductor 110. On the other hand, an auxiliary device 300 such as a voltage trip device or an undervoltage trip device is installed in the accessory device storage unit 20.
0, the common trip shaft 14 of the opening / closing mechanism 140
2 is tripped. In this embodiment, the main body cover 16 of the housing 165 is provided.
Front surface side 7 (side on which operation handle 141 is provided) 16
7a, the accessory storage unit 2 of both sides of the operation handle 141, that is, the poles other than the pole provided with the opening / closing mechanism.
A cover 260 configured to simultaneously open and close the opening 200 a of the internal attachment device 300 is installed. By opening the cover 260, maintenance such as attachment and replacement of the internal attachment device 300 can be performed. The cover 260 is formed in a substantially “concave” shape. The cover has an engaging portion with the main body cover 167 on each of two parallel sides of the “concave” shape, and when the cover 260 is closed, the “concave” shape is formed. Two parallel sides cover the accessory storage unit 200. The cover 260 is formed in a substantially concave shape so as to cover not only the opening 200a of the accessory storage unit 200 on both sides of the operation handle 141 but also a part 167b of the housing surface 167a on the power supply side terminal side. At the approximate center of the bottom, there are two holes 262 through which the fixing screws 250 are inserted. The cover 260 is slidably held by an engagement portion of the housing 165 with the body cover 167. The engagement portion has a first guide portion that guides the cover 260 in a direction along the surface of the housing 165, and a second guide portion that guides the cover 260 to prevent the cover 260 from being detached from the surface of the housing 165. The first guide portion is formed at the inner edge of two parallel sides of the “recess” of the cover 260, and the second guide portion is formed at the outer edge of two parallel sides of the “recess” of the cover 260. In this embodiment, as shown in FIGS. 2, 3 and 4, the main body cover 167 has a substantially rectangular cross section, extends along the direction in which the electric path extends, and has an operation handle 141 mounting portion 167c of the main body cover 167. Are formed on the cover 260 along the inner edges of two parallel sides of the “concave” shape, and the rib 264 is formed in the groove 174. And the first guide portion is formed in a state where the movement in the direction perpendicular to the sliding direction (the left-right direction in FIG. 4) is restricted by the rib 172. As shown in FIGS. 2, 3, and 4, the main body cover 167 has a substantially "L" -shaped cross section, extends along the direction in which the electric circuit extends, and is disposed along the side surface of the main body cover 167. Rib 170 is formed on the cover 260 along the outer edges of two parallel sides of the “concave” shape, and a rib 266 having a substantially “L” -shaped cross-section that is substantially point-symmetric with the rib 170 is formed.
The second guide portion is formed in a state where the movement of the cover 260 in the direction in which the cover 260 is disengaged from the surface of the housing 165 (upward in FIG. 4) by engaging with the rib 170 is restricted. The rib 170 is formed so that the horizontal side of the “L” shape extends in the direction toward the side surface of the housing 165 as shown in FIG. 4, and the rib 266 is formed as shown in FIG. The sides are formed so as to extend in the direction toward the inner surface of the cover 260. Thus, the cover 260 is slidably held on the housing 165. In this embodiment, the first guide portion is formed by a rib 172 having a substantially rectangular cross section, a groove 174, and a rib 264, and the second guide portion is formed, in particular, by a rib 17 of the main body cover 167.
0 is formed so as to extend in the direction toward the side of the housing, so that the movement of the mold after molding when the main body cover 167 and the cover 260 are molded with resin is not hindered, and the mold structure is simplified. Can be In this embodiment, the cover 260 has a “concave” shape so that the left and right lids can be opened at the same time, and the engaging portion is a first guide portion for guiding the cover 260 in a direction along the surface of the housing 165. When,
The cover 260 is formed by a second guide portion that guides the cover 260 so as to prevent the cover 260 from being detached from the surface of the housing 165, and functions are shared. In particular, the first guide portion includes a rib 172 having a substantially rectangular cross section, and a groove. 174 and a rib 264 inserted into the groove 174 to restrict the movement in the direction perpendicular to the sliding direction, so that the contact area between the cover 260 and the main body cover 167 can be small, and the frictional resistance during opening and closing can be reduced. Becomes smaller. Thereby, the cover 2 when attaching and detaching the attachment device 300 is
The operability at the time of opening and closing 60 is improved. In this embodiment, the opening 200a is exposed by removing the fixing screw 250 and sliding the cover 260 in the direction of the terminal on the power supply side, and the attachment device 300 is mounted in the opening 200a, or Work such as replacement of the attached device 300 already installed in the inside 200a can be performed. On the other hand, the main body cover 167 is provided with a screw hole 168 for fixing the screw 250. According to the present invention, it is possible to obtain a circuit breaker that is excellent in productivity during manufacturing and operability when opening and closing the cover.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a state in which a cover of a circuit breaker according to an embodiment of the present invention is opened. FIG. 2 is a perspective view showing a shape of a housing of the circuit breaker according to one embodiment of the present invention. FIG. 3 is a perspective view showing a shape of a cover of the circuit breaker according to one embodiment of the present invention. FIG. 4 is a side view showing a structure of an engagement portion between a cover of the circuit breaker and a main body cover according to one embodiment of the present invention. FIG. 5 is a side sectional view showing an engagement state between a cover of the circuit breaker and a main body cover according to one embodiment of the present invention. FIG. 6 is a perspective view showing a state in which a cover of the circuit breaker in one embodiment of the present invention is closed. FIG. 7 is a sectional view showing a configuration of a circuit breaker according to one embodiment of the present invention. [Description of Signs] Electric circuit: 130, contacts: 108, 112, 114, 12
8, opening / closing mechanism: 140, operation handle: 141, accessory: 300, accessory storage: 200, housing: 165,
Cover: 260, engaging part: 170, 172, 174, 2
64, 266, first guide portion: 172, 174, 26
4. Second guide: 170, 266

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Manabu Toi 46-1 Tomioka, Nakajo-cho, Kitakanbara-gun, Niigata Japan Industrial Equipment Division, Hitachi, Ltd. (56) References JP-A-6-139899 (JP, A) JP-A-6-132672 (JP, A) JP-A-9-259731 (JP, A) JP-A-6-111707 (JP, A) Jiko 3-51888 (JP, Y2) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01H 71/00-83/22

Claims (1)

(57) [Claim 1] At least a three-phase electric circuit, a contact for opening / closing the electric circuit, an opening / closing mechanism for the contact, an operation handle of the opening / closing mechanism, and an open / closed state of the contact. An auxiliary device storage unit for storing at least one of an auxiliary device for transmitting information to the outside and an external device for controlling tripping of the opening / closing mechanism from outside, the electric path, the contacts, the opening / closing mechanism, and the auxiliary device storage A housing for housing the unit, wherein the opening / closing mechanism and the operation handle are provided in one phase of the three-phase electric circuit, and the accessory device storage unit is provided in the other at least two phases. The circuit breaker further comprises a cover formed in a substantially concave shape, the cover being configured to open and close the accessory storage portion, and the cover is formed in parallel with the concave shape.
Each of the side linear portions has an engagement portion that engages with the housing, the engagement portion guides the cover in a direction along a surface of the housing, and the cover. And a second guide portion for guiding the cover from the surface of the housing to prevent the cover from coming off. The first guide portion includes two parallel sides of a concave shape of the cover.
Are formed at the inner edge of the straight portion of the cover , and the second guide portion is formed by two parallel sides of the concave shape of the cover.
A circuit breaker formed at an outer edge of a straight portion of the circuit breaker.