JP3531396B2 - Earth leakage relay - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earth leakage relay that cuts off power supply to a load when a leakage current flows.

[0002]

2. Description of the Related Art A conventional earth leakage relay of this type is a pair of a movable contact and a fixed contact interposed between input and output terminals of a power supply, and a zero-phase current transformer that inserts an electric path between the input and output terminals of the power supply . <br /> Amplifying the zero-phase current transformer and its output by installing on the base an electromagnet device that attracts the plunger when the coil is excited by the output and forcibly opens the pair of movable contacts from the fixed contacts. An electronic device including an electronic component that constitutes an amplifier has been mounted on a printed circuit board.

However, since the electronic equipment and the zero-phase current transformer are mounted on the printed circuit board and the other members are attached to the base, there is a problem that it is difficult to assemble each component, and automation is difficult. On the other hand, as shown in Japanese Utility Model Laid-Open No. 1-96639, a zero-phase current transformer, an electronic device, an input / output terminal, a movable contact, a fixed contact, an electromagnet device, etc. are attached to a printed circuit board. was there.

[0004]

However, the penetration direction of the primary side of the zero-phase current transformer is orthogonal to the thickness direction of the printed circuit board, and the zero-phase current transformer is attached to the printed circuit board .
Since the attached to the printed circuit board zero-phase current transformer by passing the lead wire, also the incorporation of the components poor, automation has a disadvantage that it is difficult.

Therefore, an object of the present invention is to provide an earth leakage relay in which the assembling property of each component is improved and the assembling work of each component is easily automated.

[0006]

According to a first aspect of the present invention, there is provided an earth leakage relay in which a printed circuit board and a primary side of which leakage current is to be detected penetrate the printed circuit board in a thickness direction of the printed circuit board. A zero-phase current transformer provided, a plurality of movable contacts that have a movable contact and are primary sides that penetrate the zero-phase current transformer, and a fixed contact that has a fixed contact facing the movable contact. An electronic device mounted on the printed circuit board to generate a predetermined output current in response to a leakage detection current induced on the secondary side of the zero-phase current transformer; and the output device attached to the printed circuit board. An electromagnet device forcibly opening the movable contact from the fixed contact having a coil which is energized by an electric current and which is attracted by the excitation of the coil, and the movable contact provided on the printed circuit board. Child and said And a terminal electrically connected to Teise' probe, the movable contactor movable contact
Located on the printed circuit board lateral to the zero-phase current transformer,
Passing the base end side through the bent part into the zero-phase current transformer
Through the printed circuit board to the back of the printed circuit board
It is soldered to the conductive pattern on the surface .

According to the earth leakage relay of the first aspect, all the components are mounted on the printed circuit board and the zero phase current transformer is printed so that the primary side of the zero phase current transformer penetrates in the thickness direction of the printed circuit board. Since the movable contactor is provided on the substrate and the zero-phase current transformer is penetrated, the assembling property of the components is improved as compared with the conventional example, and the assembling work of each component is facilitated. According to a second aspect of the present invention, there is provided a ground fault relay according to the first aspect, wherein the fixed contact, the movable contact and the electromagnet device are attached to a base mounted on the printed circuit board.

According to the earth leakage relay of claim 2, claim 1
In addition to the above effect, each component attached to the base can be made into a block, and the assemblability with respect to the printed circuit board can be improved. The earth leakage relay according to claim 3 is the same as in claim 1 or claim 2,
There are a pair of movable contacts, each base end of which penetrates the printed board, and a long hole longer than the width of the movable contact is formed in the printed board between them.

According to the earth leakage relay of claim 3, claim 1
Alternatively, in addition to the effect of the second aspect, insulation between the base ends of the movable contacts on the pattern side of the printed circuit board can be achieved, and the base ends of the movable contacts can be brought closer to each other, and the size can be reduced.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to FIGS. That is, the earth leakage relay includes the electromagnet device 5, the movable contact 7, and the printed circuit board 1.
4, zero-phase current transformer 26, terminals 30a to 30d, fixed contact 55, and amplifier 99 composed of electronic equipment.

First, the cover 1, the base 2 including the printed circuit board 14 and the terminals 30a to 30d, the coil spring 3 forming an elastic body, and the reset member 4 will be described. The cover 1 comprises a relatively shallow back cover 10 provided with spring supporting protrusions 9 and a front cover 11 having a relatively high height,
The front cover 11 is fitted to the back cover 10. Back cover 10
Forming a locking recess 12 on the side surface of the front cover 11 (see FIG. 5 ), and forming a locking claw 13 for locking the locking recess 12 on the inner surface of the front cover 11, and locking when the front cover 11 is put on the back cover 10. Nail 13
Is locked in the locking recess 12, and the closed state is held. Further, a printed circuit board holding portion 15 for contacting the periphery of the printed circuit board 14 with the back cover 10 of the cover 1 and holding the substantially central portion of the printed circuit board 14 at a predetermined interval is provided in a stepped manner on the inner peripheral surface, and a printed circuit board holding portion 15 is provided on the bottom surface. It is formed on a straight line. In addition, a cylindrical printed circuit board support cylinder 1 is provided at a place where strength is required to support it.
6 is provided, and a protrusion 17 that fits into the hole 32 of the printed board 14 is provided on the top surface thereof. The front cover 11 has mounting pieces 18 projecting from both sides, a mounting hole 19 is formed in the mounting piece 18, a terminal exposed portion 20 is formed on one side of the upper surface, and member mounting holes 21 to 23 are formed on the adjacent side portions. Is formed. Component mounting hole 2
The split claw portion 64 of the test button 64 is retained and locked at the hole edge of 1. The head 35 of the reset member 4 is inserted into and retracted from the component mounting hole 22, and a convex lens 77 is attached to the component mounting hole 23.

The base 2 has a printed circuit board 14 having an insertion hole 24 through which the spring support projection 9 is inserted, and a coil frame 25 having a base that also serves as a support for components.
And is housed in the cover 1. The printed circuit board 14 is an electronic component that constitutes a zero-phase current transformer 26 that detects an unbalanced current that flows between the pair of movable contacts 7, that is, a leakage detection current, and an amplifier that amplifies the output of the zero-phase current transformer 26. The electronic device 99 consisting of is mounted on the front cover 11 side (see FIG. 4), and the back cover 10 side is provided with a conductive pattern. The zero-phase current transformer 26 is attached to the printed circuit board 14 so that the axial direction of the hollow portion 26a, that is, the penetrating direction on the primary side where the leakage current is detected is perpendicular to the printed circuit board 14, that is, its thickness direction. . The coil frame 25 has a tubular portion 25a at the center and has component mounting portions 28 and 29 at both ends. The electronic device 99 is mounted on the printed circuit board 14 and is configured by a known means so as to generate a predetermined output current in response to the leakage detection current induced on the secondary side of the zero-phase current transformer 26. . Terminal 30a
˜30 d are attached to the printed circuit board 14, electrically connected to the movable contact 7 and the fixed contact 55 via the conductive pattern of the printed circuit board 14, and the terminal exposed portion 20 of the front cover 11 covered by the back cover 10. Is exposed to. Three
Reference numeral 1 denotes a test switch, the movable part of which is pushing up the test button 63, and when the test button 63 is pressed, the movable part comes into contact with the fixed part and causes an unbalanced current in the movable contact 7. ing. The printed board 14 is inserted into the back cover 10 and is supported by the printed board holding portion 15 and the printed board support cylinder 16 as shown in FIGS. 3 and 5. Further, when the front cover 11 covers the back cover 10, the lifting portion 100 provided on the inner surface of the front cover 11 restricts the floating of the printed circuit board 14.

The coil spring 3 is spring-supported through an insertion hole 24 formed in the printed circuit board 14 while the printed circuit board 14 is supported by the printed circuit board holding portion 15 housed in the back cover 10 and the printed circuit board support cylinder 16. Protrusion 9
Is projected from the printed board 14, one end of the coil spring 3 is fitted to the tip of the spring support protrusion 9, and the end of the coil spring 3 is in contact with the surface of the printed board 14.

The reset member 4 has a movable frame locking portion 40, is supported by the base 2 via the coil spring 3, and is located between a reset position and a return position which move against the spring force of the coil spring 3. To move. The reset member 4 includes a main body 4a.
Between the columnar head portion 35 provided on the upper end of the main body 4a, the pair of guide pieces 36 protruding from the side portion of the main body 4a, the spring receiving projection 80 provided on the lower surface of the main body 4a, and the guide piece 36 of the main body 4a. The movable frame engaging portion 40 is provided on the side surface of the. The movable frame locking portion 40 has a locking surface facing upwards, which is opposite to the printed circuit board 14, and a guide inclined surface 40a is formed on the lower surface side. On the other hand, in order to slidably regulate the position of the reset member 4, the front cover 11 is attached to the component mounting portion 29 of the coil frame 25.
A head insertion hole 33 that is aligned with the component mounting hole 22 of
Vertical groove-shaped guide portion 3 for slidably engaging the guide piece 36
4 is formed on the lower side of the head insertion hole 33 , and the upper end portion of the guide portion 34 serves as a position regulating portion for the guide piece 36. Then, the upper end portion of the coil spring 3 is engaged with the spring receiving projection 80 to urge the reset member 4 upward so that the guide piece 36 is moved.
4, the head portion 35 is inserted through the hole 33 and protrudes from the component mounting hole 22 of the front cover 11 to the outside.

The electromagnet device 5 has a coil 42 attached to the printed circuit board 14 and energized by being supplied with an output current of the electronic device 99, and has a plunger 38 attracted by the excitation of the coil 42 to provide a movable contact. 50 is forcibly opened from the fixed contact 8. Specifically, the movable frame 6 is detached from the reset member 4 and forcibly opened. This electromagnet device 5 is
The coil frame 25 is arranged on the printed circuit board 14 so that the plunger 38 operates in a direction crossing the moving direction of the reset member 4, that is, in the embodiment, in parallel with the printed circuit board 14, and the coil frame 25 has a coil portion 25a at the center thereof. 42 is wound, the plunger 38 is inserted from the component mounting portion 28 side, the return spring 46 is fitted to the small diameter portion 38b at the rear end of the plunger 38, and the inverted U-shape is provided on the side portion of the coil frame 25. The rear end of the return spring 46 is supported by one end portion of the yoke 82, and the plunger 38 is biased forward. In order to mount the yoke 82 on the coil frame 25, a notch 45 into which the one end 83 of the yoke 82 is inserted is formed in the component mounting part 29 of the coil frame 25, and a rectangular hole into which the other end 84 of the yoke 82 is inserted. 44 is formed on the coil frame 25. Further, the neck portion 38 a at the tip of the plunger 38 is connected to the other end portion 84 of the yoke 82.
In order to further protrude, the notch 84a is formed in the other end 84, and the base side of the neck 38a is locked to the edge of the notch 84a to restrict the protrusion amount of the plunger 38, whereby the return spring 46 returns the plunger 38. The position is. Further, the coil 42 is connected to the secondary side of the zero-phase current transformer 26, which is a means for detecting an unbalanced current, via an electronic device 99 which constitutes an amplifier mounted on the printed circuit board 14. Therefore, when an unbalanced current flows through the primary side of the zero-phase current transformer 26, a leakage detection current for detecting leakage is generated on the secondary side, is amplified by the electronic device 99, and is supplied to the coil 42 as a leakage response current. Then, the plunger 38 is attracted against the return spring 46, and the tip of the plunger 38 is retracted. A mounting protrusion 57 is provided on the lower surface of the component mounting portion 28 of the coil frame 25, and is fitted into a mounting hole 58 formed in the printed circuit board 14 to fix the coil frame 25 to the printed circuit board 14.

The movable frame 6 has a display engaging portion (70) and engages with the reset member 4 in a disengageable manner. The movable frame 6 is supported by the tip of a plunger 38 so as to be movable in the moving direction of the reset member 4, and when the plunger 38 is in the returning state, the reset member 4 is pressed from the returning position against the coil spring 3 to move the movable frame. The stopper 40 has a receiving portion 47 on which the receiving portion 4 is hooked, and the operation of the plunger 38 causes the receiving portion 4 to move.
7 is unlocked. More specifically, the electromagnet device 5 has a receiving portion 47 at the center and a lower surface opening recessed portion 6a for accommodating a head portion 38c of the tip of the plunger 38 in a vertically movable manner. Plunger 3 on the side
A notch (not shown) is formed through which the neck portion 38a of No. 8 is inserted. Therefore, when the head portion 38c is inserted into the recess 49 so that the neck portion 38a of the plunger 38 passes through the notch, the movable frame 6 can move in the vertical direction, but the movement direction of the plunger 38 can follow the movement of the plunger 38. Becomes The receiving portion 47 has an inclined surface on the lower surface, and a guide inclined surface 47a that slidably contacts the guide inclined surface 40a of the movable frame locking portion 40 is formed on the upper surface side. The display engaging portion is formed by an inclined elongated hole 70 formed in the movable frame 6 obliquely with respect to the horizontal.

The plurality of movable contacts 7 are primary sides that penetrate the zero-phase current transformer 26 via the movable contact 50, are supported by the movable frame 6, are weaker than the coil spring 3, and are reset members. 4 has a spring force opposite to the urging direction of the movable frame 6
The movable contact 50 comes into contact with the fixed contact 8 of the fixed contact 55 in a state where the movable contact 50 is engaged with the reset member 4. This movable contact 7
The base portion is supported by the base 2 and the tip portion is engaged with the movable frame 25 to be pushed up by the movement of the reset member 4 of the movable frame 25 in the returning direction, and the movable contact point 50 oriented in the pushing direction is provided at the tip portion. There is. One of the pair of movable contacts 7 has a strip plate shape and is punched so that the tip end side is bent in a substantially Z shape, and the base end side is bent substantially at right angles in the plate thickness direction. The other movable contactor 7 is also in the shape of a strip plate, but is punched out so that the whole is substantially J-shaped and the tip side is substantially Z-shaped in the direction opposite to the one movable contactor 7 described above, and the base end side is formed at a substantially right angle. It is bent in the thickness direction. A hole 51 is formed on the base end side of the pair of movable contacts 7, and the hole 51 is fitted and fixed to the projection 101 formed on the component mounting portion 28 of the coil frame 25. Further, a portion of the movable contact 7 closer to the front end than the portion punched out into the substantially Z shape is engaged with the movable contact pressing portion 48 of the movable frame 25, and the movable contact 50 is fixed to the front end side. ing. On the other hand, the proximal end of the movable contactor 7 penetrates the hollow portion 26a of the zero-phase current transformer 26 and the through hole (not shown) of the printed circuit board 14 to move the movable contactor 7 as shown in FIG. A retaining piece 5 cut and raised at the end of the child 7.
2 is locked and soldered to the conductive pattern on the back surface. The movable contact 7 is connected to the external connection terminals 30a and 30b via a conductive pattern.

In the printed board 14, a long hole 89 longer than the width of the movable contact 7 is formed between the base ends of the pair of movable contacts 7 in the printed board 14 (see FIG. 4).
The insulation of is secured. The fixed contact 55 is formed in a substantially inverted L shape, and the fixed contact 8 facing the movable contact 50 is fixed to the horizontal upper piece. Recessed grooves 56 are formed on both lower surfaces of the component mounting portion 29 of the coil frame 25, and grooves 56a for inserting both sides of the upper piece of the fixed contact 55 are formed on the inner side surface of the recessed groove 56 (see FIG. 3). The contact 8 is located in the groove 56.

Here, the coil frame 25 includes the fixed contact 55, the movable contact 7, the electromagnet device 5, and the printed circuit board 1 described above.
The base is attached to No.4. In addition, fixed contact 55
Has a lower end portion penetrated through the through hole of the printed board 14 and is attached and fixed by a retaining piece 90 cut and raised at the lower end portion, soldered to a conductive pattern, and connected to the external terminals 30c and 30d through the conductive pattern. It is connected.
The fixed contact 55 also serves to fix the coil frame 25 together with the protrusion 57 of the coil frame 25. As described above, in the coil frame 25, the yoke 82 is pressed by the pressing projections 91 on the inner surface of the front cover 11 (FIG. 3), and the component mounting portion 29 is pressed by the inner surface of the front cover 11.
By fixing the front cover 11 to the back cover 10, the printed circuit board 14 and the coil frame 25 are sandwiched between the back cover 10 and the front cover 11. Reference numeral 59 is a retaining claw of the fixed contact 55 that engages with the groove 56a of the concave groove 56.

The display member 68 has a shaft portion 69 that is axially supported by the shaft supporting portion 93, an engaging piece 71 that engages with the inclined elongated hole 70 that is a display engaging portion, and further has a display portion 72. Have. The display member 68 is provided between the printed circuit board 14 and a shaft support portion 93, which is formed by cutting out a substantially semi-cylindrical shape at the tip of a shaft support portion 92 provided in a component mounting portion 29, which is a base on which a shaft portion 69 provided in the middle is provided. An engaging piece 71, which is rotatably sandwiched and supported, is provided on one end side to engage with an inclined elongated hole 70 formed obliquely with respect to the horizontal in the movable frame 6, and a display portion 72 provided on the opposite end portion is displayed. Cover 11
It faces the component mounting hole 23, which serves as the display hole.

The operation of the earth leakage relay will be described with reference to FIG. FIG. 6A shows a state in which the receiving portion 47 of the movable frame 6 is locked to the movable frame locking portion 41 of the reset member 4, and the movable contact 7 is pushed up and moved by the spring force of the coil spring 3. The contact 50 is in contact with the fixed contact 8. Therefore, when a current flows between the terminals 30a and 30b and the terminals 30c and 30d and there is no leakage current, the pair of movable contacts 7
Since the equilibrium current flows during the period, the leakage response current is not induced on the secondary side of the zero-phase current transformer 26. When there is a leakage current, an unbalanced current flows through the movable contact 7 and a leakage response current is induced as a detection current on the secondary side of the zero-phase current transformer 26, which is amplified by an amplifier and an exciting current flows through the coil 42. . Therefore, the plunger 38 is sucked and moves backward as shown by the arrow in FIG. 6A, and the receiving portion 47 is disengaged from the movable frame locking portion 41. As a result, the movable frame 6 is guided by the head portion 38c of the plunger 38 to move downward due to the spring force of the movable contactor 7, and the movable contact 50 separates from the fixed contact 8 as shown in FIG. 6B. . As a result, the current between the terminals 30a, 30b and the terminals 30c, 30d is stopped and the leakage current is cut off. When the exciting current stops flowing through the coil 42 due to the stop of this current, the plunger 38 is returned by the return spring 46, and FIG.
As shown in (c). In this state, when the reset member 4 is pressed by compressing the coil spring 3 to move it to the reset position, the movable frame locking portion 40 and the receiving portion 47 cause the guide inclined surface 4 to move.
0a and 47a, the movable frame locking portion 40 engages with the receiving portion 47, and when the reset member 4 is released from the pressure, the movable frame 25 is pulled up by the returning action of the coil spring 3 and moved accordingly. The contact 7 is pushed up, and the movable contact 50 moves to the fixed contact 8.
, And the reset completion state shown in FIG.

Further, since the engaging piece 71 moves in association with the above-described operation of the movable frame 25, the contact display member 68 is moved to the shaft portion 69.
Is rotated about the fulcrum, the display portion 72 is positioned below the component mounting hole 23 as shown in FIG.
When the movable contact 50 moves upward so that the movable contact 50 comes into contact with the movable member 50, the display member 68 rotates and the display portion 72 separates from the display window 23.

According to this embodiment, the printed circuit board 1
4, all the components are mounted on the printed circuit board 14, and the zero-phase current transformer 26 is arranged on the printed circuit board 14 so that the primary side of the zero-phase current transformer 26 penetrates in the thickness direction of the printed circuit board 14. Since the zero-phase current transformer 26 is penetrated, the assembling property of the parts is improved as compared with the conventional example, and the assembling work of each part is easily automated.

Further, since the fixed contact 55, the movable contact 7 and the electromagnet device 5 are attached to the base attached to the printed circuit board 14, each component attached to the base can be made into a block and printed. The assemblability with respect to the substrate 14 is improved. Further, there is a pair of movable contacts 7, each base end of which penetrates the printed board 14, and a long hole 89 longer than the width of the movable contact 7 is formed in the printed board 14 between them, so that the pattern side of the printed board 14 is formed. Since the base ends of the movable contactor 7 can be insulated, the base ends of the movable contactor 7 can be brought close to each other, and the size can be reduced.

[0025]

According to the earth leakage relay of the first aspect, all the components are mounted on the printed circuit board and the zero phase current transformer is arranged so that the primary side of the zero phase current transformer penetrates in the thickness direction of the printed circuit board. Is disposed on the printed circuit board, and the movable contact is penetrated through the zero-phase current transformer. Therefore, assembling of components is improved as compared with the conventional example, and the assembling work of each component is facilitated.

According to the earth leakage relay of claim 2, claim 1
In addition to the above effect, each component attached to the base can be made into a block, and the assemblability with respect to the printed circuit board can be improved. According to the earth leakage relay of claim 3, in addition to the effect of claim 1 or claim 2, insulation between the base ends of the movable contacts on the pattern side of the printed circuit board can be achieved, and the base ends of the movable contacts can be separated from each other. It is possible to bring them closer to each other and to make them compact.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an embodiment of the present invention.

FIG. 2 is a partially enlarged view thereof.

FIG. 3 is a sectional view of an assembled state.

FIG. 4 is a plan view with a front cover removed.

FIG. 5 is a cross-sectional view showing a state where movable contacts are separated.

FIG. 6 is an explanatory diagram illustrating an operation of an earth leakage relay.

[Explanation of symbols]

5 Electromagnet device 7 Movable contact 8 fixed contacts 14 Printed circuit board 25 Coil frame as the base 26 Zero-phase current transformer 30a to 30d terminals 38 Plunger 42 coils 50 movable contacts 55 Fixed contact 89 long hole 99 electronic devices

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kosei Kimura 1 564, Handa, Tsu City, Mie Prefecture Mie Metal Industry Co., Ltd. (56) Reference JP-A-8-190850 (JP, A) -86250 (JP, U) Actual Kaihei 7-27045 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01H 83/02

Claims (3)

(57) [Claims] 1. A printed circuit board, a zero-phase current transformer provided on the printed circuit board so that a direction through which a primary side of which leakage current is detected penetrates is a thickness direction of the printed circuit board, and a movable contact. A plurality of movable contacts that have a primary side that penetrates the zero-phase current transformer, a fixed contact that has a fixed contact facing the movable contact, and a zero-phase mounted on the printed circuit board. The current transformer includes an electronic device that generates a predetermined output current in response to a leakage detection current induced on the secondary side of the current transformer, and a coil that is attached to the printed circuit board and that is energized by the output current. An electromagnet device that has a plunger that is attracted by the excitation of a coil to forcefully open the movable contact from the fixed contact, and is electrically connected to the movable contact and the fixed contact provided on the printed circuit board. The edge With the door, the movable contactor side of the movable contact is the zero-phase current transformer
Located on the printed circuit board of the base end side through the bent part
Through the zero-phase current transformer and the printed circuit board
The conductive pattern on the back side of the printed circuit board
Attached leakage relay. 2. The earth leakage relay according to claim 1, wherein the fixed contact, the movable contact, and the electromagnet device are attached to a base that is attached to the printed circuit board. 3. A pair of movable contacts, each base end of which penetrates the printed circuit board, and a long hole longer than the width of the movable contactor is formed in the printed circuit board between the movable contactors. The earth leakage relay according to claim 1 or 2, which is formed.