JP2013246993A - Case structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure of a case provided with a structure which prevents foreign matters from being scattered in the case and prevents a component from being affected by the foreign matters by staying in a component arrangement part even though the foreign matters, such as abrasive powder occur when the component is inserted into and fixed to the component arrangement part provided in the case from one direction.SOLUTION: The case is configured by providing the component arrangement part for inserting a component from one direction for arrangement with a guide part for guiding the component to a prescribed position of the component arrangement part, and a recessed formation part having an opening part facing the component in the vicinity of an end edge of the guide part and formed in a recessed state.

Description

The present invention relates to a structure of a case in which components are arranged, and more particularly to a structure of a case having a component arrangement structure in which components are fitted and fixed at predetermined positions in the case from one direction.

Parts constituting the electrical equipment are internally provided inside the container constituting the outer shell of the electrical equipment. For example, in a circuit breaker provided in a distribution board, a container constituting the outline is formed of a resinous material, and inside the container as a component constituting a circuit breaker, for opening and closing an electric circuit A contact opening / closing mechanism, an operation unit for operating the contact opening / closing mechanism, a current detection unit for detecting a current flowing in the electric circuit, and acting on the contact opening / closing mechanism when the detected current reaches a predetermined level. Thus, various components constituting a tripping device unit and the like for bringing the contact into an open state are incorporated.

Patent Document 1 discloses a branch switch used for a circuit breaker provided in a distribution board. In such a branch switch, a case (1, 8), which is a container constituting the outer shell, is formed of a resinous material, and in this case, a component placement portion (shown by 22a) for placing parts in advance is formed. Are formed.

In the case, particularly for a component whose arrangement position is preferably fixed uniquely, a position restricting portion that regulates rattling at the arrangement position is provided so that the part is arranged at a predetermined position. Generally, it is provided at the arrangement position.

In Patent Document 1, a tripping device (23a) is mentioned as a component whose arrangement position is preferably fixed uniquely. The trip device (23a) is a device that acts on the contact opening / closing mechanism using electromagnetic induction of current flowing in the electric circuit, and a yoke (junction) provided so as to surround the main circuit conductive part serving as an electric circuit, and the An iron piece sucked by the yoke is provided.

When this tripping device (23a) is arranged in the case, it is arranged so as to fit in a predetermined position in the case. The internal dimension relationship of the fitting portion is determined to be a dimension that slightly interferes with the tripping device. When the tripping device (23a) is fitted into the fitting portion, the interfering portion is fitted while sliding. The tripping device (23a) is designed to be arranged at a predetermined position without rattling.

Japanese Patent Laid-Open No. 2002-56763 (FIG. 1)

With the component placement section thus provided, the placement position of the components such as the tripping device is uniquely fixed, but on the other hand, the interference between the components causes scraping in the component or the component placement section. In some cases, foreign matter such as dust is generated.

If foreign matter such as cutting dust adheres to a part or adheres to an electrical circuit, it may affect the operation of the part that is in operation, or the physical properties may change over time and the performance may not be maintained normally. . In particular, in a circuit breaker such as that disclosed in Patent Document 1, if foreign matter such as dust adheres between the contacts of the contact opening / closing mechanism, power may not be supplied normally even if the contacts are closed.

Therefore, in view of the above problems, the present invention scatters foreign matter in the case even if foreign matter such as shavings is generated when the component is fitted and fixed to the component placement portion provided in the case from one direction. It aims at providing the structure of the case provided with the structure where the influence by a foreign material does not generate | occur | produce without staying at a component arrangement | positioning part.

The circuit breaker according to the present invention is configured to solve the above-described problems, and the case structure according to claim 1 is a case structure including a component placement portion that fits and arranges components from one direction. A guide portion for guiding the component to a predetermined position of the component placement portion in the component placement portion; and a concave formation portion formed in a concave shape having an opening facing the component near the end of the guide portion; , Provided as a feature.

According to such a configuration, even if foreign matter such as dust is generated when the component is fitted into the component placement portion, the foreign matter is accommodated in the concave formation portion formed in a concave shape with the opening facing the component. Therefore, it is possible to provide a case structure in which foreign matter does not scatter in the case.

According to a second aspect of the present invention, the concave forming portion is configured such that the opening is covered with a component disposed at a predetermined position.

According to the second aspect of the present invention, since the concave forming portion having the opening facing the component and formed in a concave shape is covered with the component fitted in the component arranging portion, the generated foreign matter is formed in the concave shape. Can be fastened to the surface, and no foreign matter will scatter in the case

According to the present invention, even when a foreign object such as shaving powder is generated when a part is fitted and fixed in a part placement part provided in the case from one direction, the foreign substance is not scattered in the case, and the part placement The structure of the case provided with the structure which does not generate | occur | produce the influence by a foreign material by staying in a part can be provided.

The perspective view of the circuit breaker which showed 1st Embodiment is shown. The perspective view when the components which concern on the embodiment are arrange | positioned is shown. The perspective view when attaching the fitting object component which concerns on the embodiment is shown. The principal part perspective view which concerns on the same embodiment is shown. The principal part expansion perspective view which concerns on the same embodiment is shown. The perspective view of the case which concerns on 2nd Embodiment is shown. The principal part expansion perspective view which concerns on the same embodiment is shown. An explanatory view in a conventional example is shown.

Next, the case structure according to the present invention will be described in detail with reference to FIGS. Embodiment demonstrates the case where the case structure of this invention is applied to the body of a circuit breaker.

(First embodiment)
(Description of circuit breaker)
FIG. 1 shows a circuit breaker 1 configured using a case structure of the present invention, and shows an internal structure in a state in which one case is removed from the cases constituting a container body by overlapping each other. . The circuit breaker 1 is a two-pole circuit breaker used as a branch circuit breaker of a distribution board. Depending on the connection form of the distribution board, the circuit breaker 1 supplies power to the load side through a single-phase three-wire circuit or a single-phase two-wire circuit.

Hereinafter, in the longitudinal direction of the circuit breaker, the side provided with the power supply side terminal portion indicated by 105 in the figure is the power supply side, and the opposite side of the power supply side is the load side. The side on which the operation handle 103 for operating the circuit breaker 1 is provided is the front side, the side attached to the mounting plate for mounting and fixing the circuit breaker is the bottom side, and the left and right wire insertion holes 105 and 106 are connected. The description will be made with the direction as the width direction.

The case of the circuit breaker 1 is made of a resin material and is divided in the longitudinal direction. When the divided cases are used as the first case 101 and the second case 102, these cases are overlapped from both sides in the width direction to form an outer shape of the circuit breaker 1, that is, a container body.

Each part which comprises the circuit breaker 1 is arrange | positioned in the predetermined position in a case. The case is formed with a component placement portion for placing each component. In the circuit breaker 1, various components are placed on the second case 102, and the first case 101 is overlaid on the circuit. Configure the circuit breaker.

(Internal configuration of circuit breaker)
The circuit breaker 1 is in the form of an earth leakage breaker. The circuit breaker 1 has a power supply side terminal (105a, 105b) provided on the power supply side and a load side terminal 104 provided on the load side (a load side terminal on the other pole). Is not shown), a main circuit conductive portion 111 of each pole connected to these terminals, a contact opening / closing mechanism portion 112 that contacts / separates contacts provided on the main circuit conductive portion 111 interposed in the main circuit conductive portion 111, A trip device (113) that operates the contact opening / closing mechanism when an abnormal current such as an overcurrent flows through the main circuit conductive portion 111, and the main circuit conductive portion 111 of each pole is inserted. A zero-phase current transformer (ZCT) 109, a detection circuit 110 that receives the output signal from the ZCT 109 and detects the magnitude of the leakage current flowing in the circuit, and when the magnitude of the leakage current reaches a predetermined magnitude Operation signal from detection circuit 110 Receiving the earth leakage blocking mechanism for switching operation of the circuit by acting on the contact switching mechanism 112 (trip coil) 108 and the like are provided. Between each pole, the inter-electrode insulating wall A (107) is disposed, and the insulation of each pole is maintained.

Further, the contact opening / closing mechanism 112 is connected to the operation handle 103 by a link mechanism, and can be manually turned on / off from the outside of the body by the operation handle 103 in addition to the operation by the automatic shut-off mechanism.

A test button 106 for manually confirming the operation of the detection circuit 110 and the trip coil 108 from the outside of the body is provided on the front side of the body. A part of the test button 106 protrudes outside the body and can be pressed with a finger or the like from the outside of the body. A contact circuit connected to the detection circuit 110 is provided on the bottom side of the test button 106, and the detection circuit 110 is driven by closing the contact circuit when the test button 106 is pressed. .

In the circuit breaker 1, the electrodes are insulated from each other by the inter-electrode insulating wall A (107). The inter-electrode insulating wall A (107) is disposed in the body in a substantially flat shape in the longitudinal direction of the circuit breaker from the power source side terminal side 105 to the load side terminal 104 side to insulate the electrodes from each other. A printed circuit board constituting the detection circuit 110 is disposed on the side surface of the inter-electrode insulating wall A (107), and a test button holding unit 107A1 for holding the test button and a test button 106 are provided on the front side. A contact circuit arrangement portion connected to the detection circuit 110 provided on the bottom surface side is formed.

(Part placement part)
Next, a tripping device 113 (23a in the background art) is given as a part whose placement position is preferably fixed in the case, and the case structure of the present invention is applied to the placement of the tripping device 113. A form is demonstrated.

FIG. 2 shows a state in which the inter-electrode insulating wall A (107) and the detection circuit 110 are removed. The tripping device 113 is located on the back side of the inter-electrode insulating wall A (107), and is fitted into and fixed to the component placement portion 114 provided in the second case 102.

The case where the tripping device 113 arranged in this way is attached to the case will be described with reference to FIGS. The component placement section 114 provided in the second case 102 regulates the position of the tripping device 113 in the longitudinal direction and the front-bottom direction by ribs extending in the width direction from the side wall surface side in the width direction of the case. To do.

Positioning part A (1111A), positioning part B (1112B), positioning part D (1114D) are provided as ribs for regulating the position in the longitudinal direction of tripping device 113, and ribs for regulating the position on the front-bottom side. , Positioning part A (1111A), positioning part C (1113C), positioning part E (1115E) are provided.

Among these, the positioning part D (1114D) and the positioning part E (1115E) are guide parts formed with ridges formed in the width direction in a triangular shape having a protruding tip. These guide portions are tapered at the start end of the guide in the direction toward the end of the guide portion (direction of the side wall surface), and are easily fitted into a predetermined position when the tripping device 113 is disposed.

In the vicinity of the terminal end of the guide portion, a concave forming portion 115 is formed which has an opening in which the starting end direction of the guide portion is open and is formed in a concave shape. The recess is provided so that the triangular tip of the guide portion protrudes into the recess.

On the other hand, the trip device 113 includes a main circuit conductive portion a (111a) having a fixed contact 111e disposed at one end, and a main circuit conductive portion b (111b) connected to the other end of the main circuit conductive portion a (111a). And a yoke 111c provided so as to surround the main circuit conductive portion b (111b) and an iron piece 111d attracted to the yoke 111c are integrally assembled. It is inserted and fixed to. The tripping device 113 is provided with a portion that comes into contact with the positioning portion when fitted, and the positioning portion A (1111A) has a contact portion a (1111a) and a positioning portion B (1112B), respectively. Is the contact part b (1112b), the positioning part C (1113C) is the contact part c (1113c), the positioning part D (1114D) is the contact part d (1114d), and the positioning part E (1115E) is the contact part e. (1115e). That is, the contact portions that regulate the position in the longitudinal direction in the tripping device 113 are the contact portion a, the contact portion b, and the contact portion d, and the contact portions that regulate the position on the front-bottom side are contact points. Part a, contact part c, and contact part e.

Here, the length between the positioning part C (1113C) and the positioning part E (1115E) is slightly shorter than the length between the contact part c (1113c) and the contact part e (1115e) in the front-bottom direction. The length between the positioning part B (1112B) and the positioning part D (1114D) is slightly shorter than the length between the contact part b (1112b) and the contact part d (1114d) in the longitudinal direction. The dimensions are such that the part and the positioning part interfere with each other. The amount of interference is set to about several hundreds of micro millimeters, and in the case of this embodiment, it is about 300 micro millimeters.

(When fitted)
When the tripping device 113 formed in this way is arranged in the component placement unit 114, the tripping device 113 is generally fitted to the component placement unit 114 and fitted toward the side wall. At this time, the positioning portion D (1114D) and the positioning portion E (1115E) serve as a guide portion, and together with the tapered portion formed at the start end of the guide, the tripping device 113 is arranged as a part. Guided to a predetermined position of the portion 114. When the tripping device 113 is further fitted, the positioning portion C (1113C) -positioning portion E () with respect to the length between the contact portion c (1113c) -contact portion e (1115e) in the front-bottom direction. 1115E) is slightly shortened, and positioning portion B (1112B) -positioning portion D (1114D) with respect to the length between contact portion b (1112b) -contact portion d (1114d) in the longitudinal direction. Since the length of the gap is slightly shortened, the guide portion having a predetermined interference amount is scraped with sliding with the contact portion f (1116f) of the component, and the tripping device 113 is rattled. It is arranged at a predetermined position. Specifically, the abutting portion f (1116f) of the tripping device 113 scrapes the tip portion of the guide portion that is formed in a protruding triangular shape in the width direction.

The scraped powder generated by the guide portion being scraped with the sliding with the contact portion f (1116f) is pressed toward the side wall surface by the tripping device 113 itself. At this time, since the triangular tip portion of the guide portion is provided so as to protrude into the concave portion of the concave forming portion 115, the shaving powder is stored in the concave portion as it is. Further, the tripping device 113 is formed in such a positional relationship that the contact portion f (1116f) is overlapped with the edge of the opening of the recess forming portion 115 at a predetermined arrangement position of the tripping device 113. When 113 is fitted into the component placement portion 114, the contact portion f (1116f) serves to cover the edge of the opening, and the shaving powder stored in the recess remains in the recess.

Therefore, since the concave forming portion 115 having the opening facing the tripping device 113 and formed in a concave shape is covered with the component fitted in the component arranging portion, the generated shaving powder (foreign matter) is formed in a concave shape. Can be fastened to the portion 115, and no foreign matter is scattered in the case.

(Second embodiment)
Next, the second embodiment will be described using the circuit breaker 1 as in the first embodiment. In the second embodiment, the case structure of the present invention is applied to a case itself that is overlaid instead of a component that is housed in the case. (FIG. 6, FIG. 7) That is, although the circuit breaker 1 is provided with the case divided | segmented into a longitudinal direction, it is the form which applied the case structure of this invention to these cases 101 and 102. FIG.

Case 101 and case 102 are overlapped with each other. Cases 101 and 102 are provided with wall surfaces extending in the width direction so that when the cases are overlapped, the bottom wall surfaces of the cases overlap to form a double bottom.

Positioning portions 1011b that serve as guides for guiding the second case 102 are formed in the width direction on the bottom surface side of the first case 101 at portions where the bottom wall surfaces overlap. In the vicinity of the end of the positioning portion 1011b, there is provided a concave forming portion 1011C having an opening facing the component and formed in a concave shape. Further, the first end of the guide portion 1011b is processed into a tapered shape as in the first embodiment. The concave portion is provided such that the protruding portion of the positioning portion 1011b protrudes into the concave portion.

The second case 102, which is a case overlapped with the first case 101, is provided with a combination wall 1021 that slides on the guide portion 1011b. The combination wall 1021 forms a double bottom. When the cases are overlapped, they are slid and scraped with the front side of the positioning portion 1011b. As in the previous embodiment, the shaved powder is pressed toward the concave forming portion 1011C and finally stored in the concave portion. By forming the combination wall 1021 so that the widthwise surface of the combination wall 1021 overlaps the edge surface of the recess formation portion when the case is overlapped, the recesses are formed by the widthwise surface of the combination wall 1021. The shavings stored in the recess cannot be scattered from the recess into the case. The generated shaving powder (foreign matter) can be retained in the concave forming portion 115, and the foreign matter is not scattered in the case.

In this way, in addition to the shavings that occur when fitting metallic parts into resinous material cases, the shavings that occur when fitting resinous material cases are also formed in the component placement section. It is possible to provide a case structure including a structure that can be fastened to the recess forming portion and that is not affected by foreign matter.

DESCRIPTION OF SYMBOLS 1 Circuit breaker 101 1st case 1011a Guide part 1011b Guide part 1011c Recess formation part 102 2nd case 1021 Combination wall 103 Operation handle 104 Load side terminal 105 Power supply side terminal 106 Test button 107 Interpolar insulating wall 108 Trip coil 109 Zero-phase current transformer (ZCT)
110 Detection Circuit 111 Main Circuit Conducting Unit 112 Contact Opening / Closing Mechanism Unit 113 Tripping Device 114 Component Arrangement Unit 115 Recess Formation Unit 1111A Positioning Unit A
1112B Positioning part B
1113C Positioning part C
1114D Positioning part D
1115E Positioning part E
1111a Contact part a
1112b Contact part b
1113c Contact part c
1114d Contact part d
1115e Contact part e
1116f Contact part f

Claims (2)

A case structure having a part placement part for fitting and placing parts from one direction,
In the component placement part,
A guide portion for guiding the component to a predetermined position of the component placement portion;
A concave forming portion formed in a concave shape having an opening facing the component in the vicinity of the end of the guide portion;
A case structure characterized by comprising:
The concave forming portion is
The case structure according to claim 1, wherein the opening is covered with a part arranged at a predetermined position.

Images