JP3531395B2 - 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 is operated by an earth leakage detection current by pushing up a movable frame engaged with the reset member by a spring force of a coil spring supporting a reset member to bring a movable contact into contact with a fixed contact. By pulling the movable frame with the plunger of the electromagnet device and removing it from the reset member,
The movable contact is separated from the fixed contact by the return operation of the movable contactor, thereby interrupting the electric leakage, and then the reset member is pressed by the coil spring to engage the movable frame with the reset member and push up the movable contactor. It makes contact with the fixed contacts (for example, Kaikaihei 7-27045).

[0003]

However, in the conventional example, the reset member is supported on one end of the coil spring, and the base is provided with the protrusion for supporting the other end of the coil spring. Therefore, if a coil spring is mounted between the base and the reset member and the reset position of the reset member is restricted, it is difficult to retrofit the coil spring or replace the coil spring.

Therefore, an object of the present invention is to provide an earth leakage relay in which the coil spring can be easily attached and detached.

[0005]

According to another aspect of the present invention, there is provided an earth leakage relay comprising: a cover having a spring supporting protrusion therein; a base housed in the cover having an insertion hole for inserting the spring supporting protrusion; A coil spring, one end of which is supported by the spring support protrusion inserted through the insertion hole, and a movable frame locking portion, which is supported by the other end of the coil spring and moved against the spring force of the coil spring. A reset member that moves between a reset position and a return position; an electromagnet device that has a plunger that is supported by the base and that is excited by a leakage response current and that operates in a direction that intersects the moving direction of the reset member; Is movably supported in the moving direction of the plunger and presses the reset member from the return position against the coil spring in the return state of the plunger. And a movable frame having a receiving portion to which the movable frame locking portion is hooked, the receiving portion being unlocked by the operation of the plunger, and a base portion supported by the base and a tip portion engaging with the movable frame. A movable contactor which is pushed up by the movement of the reset member of the movable frame in the return direction and has a movable contact pointed in the push up direction, and a movable contactor which is supported by the base at the reset position of the reset member. And a fixed contact that contacts the movable contact.

According to the earth leakage relay of the first aspect, the base is housed in the cover with the coil spring interposed between the position of the insertion hole of the base and the reset member, and the insertion hole is passed through the spring supporting protrusion of the cover. Since the coil spring can be supported, the coil spring can be easily attached and detached after the reset member is arranged on the base before the base is housed in the cover. Further, by removing the base from the cover, the coil spring can be easily replaced even when the reset member is provided.

According to a second aspect of the present invention, there is provided a leakage relay according to the first aspect, wherein the base detects a leakage current detected between the pair of movable contacts, and a zero-phase current transformer. The zero-phase current transformer is mounted so that the penetrating direction on the next side is vertical, and the printed circuit board is mounted with electronic components for amplifying the output of the zero-phase current transformer. The base end side of a pair of movable contacts is penetrated.

According to the earth leakage relay of claim 2, claim 1
In addition to the above effect, since the movable contactor is directly passed through the zero-phase current transformer without connecting another member such as a lead wire to the movable contactor, the work of penetrating the zero-phase current transformer becomes easy. The earth leakage relay according to claim 3 is the relay according to claim 2, wherein the base ends of the pair of movable contacts penetrate the printed circuit board and are longer than the width of the movable contact between the movable contacts of the printed circuit board. A long hole is formed.

According to the earth leakage relay of claim 3, claim 2
In addition to the above effect, insulation can be achieved between the base ends of the movable contacts on the pattern side of the printed circuit board, and the base ends of the movable contacts can be brought closer to each other, thus achieving compactness. According to a fourth aspect of the present invention, in the earth leakage relay according to the second or third aspect, the cover is provided with a printed circuit board holding portion that abuts around the printed circuit board and holds substantially central portions of the printed circuit board at predetermined intervals. Is.

According to the earth leakage relay of claim 4, claim 2
Alternatively, in addition to the effect of the third aspect, the electronic component mounted on the printed circuit board and the mounting solder for the movable contact or the like can be stored even if protruding from the printed circuit board.

[0011]

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 cover 1, the base 2, the coil spring 3, the reset member 4, the electromagnet device 5, the movable frame 6, the movable contact 7, and the fixed contact 8. The cover 1 has a spring support protrusion 9 inside. The cover 1 according to the embodiment has a box shape and includes a relatively shallow back cover 10 and a front cover 11 having a relatively high height, and the front cover 11 is fitted to the back cover 10. A locking recess 12 is formed on the side surface of the back cover 10 (see FIG.
5 ), a locking claw 13 that locks in the locking recess 12 is formed on the inner surface of the front cover 11, and when the front cover 11 is put on the back cover 10, the locking claw 13 locks in the locking recess 12. The closed state is retained. 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. Further, a cylindrical printed circuit board support cylinder 16 is provided at a position that requires strong support, and a projection 17 that fits into the hole 32 of the printed circuit 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. The split claw portion 64 of the test button 64 is retained and locked at the hole edge of the component mounting hole 21. 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 an insertion hole 24 through which the spring support projection 9 is inserted, and is housed in the cover 1. The base 2 according to the embodiment includes a printed circuit board 14 and a coil frame 25 that also serves as a component support. The printed circuit board 14 has a zero-phase current transformer 26 that detects a leakage current detected between the pair of movable contacts 7 and an electronic component 99 that amplifies the output of the zero-phase current transformer 26 mounted on the front cover 11 side. However, the back cover 10 side has a conductive pattern. The zero-phase current transformer 26 is attached to the printed board 14 such that the axial direction of the hollow portion 26a, that is, the penetrating direction on the primary side is perpendicular to the printed board 14, that is, the thickness direction. Coil frame 25
Has a tubular portion 25a in the central portion thereof, and the component mounting portion 2 at both end portions thereof.
8 and 29 are provided. Reference numerals 30a to 30d denote external connection terminals attached to the printed circuit board 14, and the back cover 10
It is exposed at the terminal exposed portion 20 of the front cover 11 which is covered with the. Reference numeral 31 is 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. Also, the front cover 11
By covering the back cover 10 with the back cover 10, the pressing portion 100 provided on the inner surface of the front cover 11 regulates the floating of the printed circuit board 14.

One end of the coil spring 3 is supported by a spring support protrusion 9 inserted in the insertion hole 24. In the embodiment, the insertion hole 24 is formed in the printed circuit board 14, and the printed circuit board 14 is supported by the printed circuit board holding portion 15 and the printed circuit board support cylinder 16 housed in the back cover 10 and the spring is passed through the insertion hole 24. The support projection 9 projects from the printed board 14, one end of the coil spring 3 is fitted to the tip of the spring support projection 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 other end of the coil spring 3, and moves between a reset position and a return position which move against the spring force of the coil spring 3. . The reset member 4 of the embodiment includes a columnar head portion 35 provided on the upper end portion of the main body 4a, a pair of guide pieces 36 protruding from the side portion of the main body 4a, and a spring receiving projection provided on the lower surface of the main body 4a. 80 and a movable frame locking portion 40 provided on the side surface between the guide pieces 36 of the main body 4a. 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, a head insertion hole 33 that is aligned with the component mounting hole 22 of the front cover 11 is formed in the component mounting portion 29 of the coil frame 25, and the guide piece 36 slides. A vertically grooved guide portion 34 that freely engages is formed below the head insertion hole 33 , and the upper end portion of the guide portion 34 serves as a position restricting 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 bias the reset member 4 upward, and the guide piece 36 is locked to the upper end portion of the guide portion 34. Through
It projects outside from the component mounting hole 22 of the front cover 11.

The electromagnet device 5 has a plunger 38 which is supported by the base 2 and is excited by a leakage response current to operate in a direction intersecting the moving direction of the reset member 4. In the embodiment, the coil 42 is wound around the central tubular portion 25a of the coil frame 25, the plunger 38 is inserted from the component mounting portion 28 side, and the return spring 46 is fitted to the small diameter portion 38b at the rear end of the plunger 38. The rear end of the return spring 46 is supported by one end of the inverted U-shaped yoke 82 arranged on the side of the coil frame 25, and the plunger 38 is biased forward. In order to mount the yoke 82 on the coil frame 25, one end portion 83 of the yoke 82
The notch 45 for inserting the component mounting portion 29 of the coil frame 25
And the rectangular hole 44 into which the other end 84 of the yoke 82 is inserted is formed in the coil frame 25. Further, since the neck portion 38a at the tip of the plunger 38 is projected from the other end portion 84 of the yoke 82, a notch 84a is formed in the other end portion 84, and the base side of the neck portion 38a is locked to the edge portion of the notch 84a so that the plunger 38 can be secured. The amount of protrusion is regulated so that the plunger 38 is returned to the return position by the return spring 46.
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 component forming an amplifier 99 mounted on the printed 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 amplifier 99, and is supplied to the coil 42 as a leakage response current. The plunger 38 is attracted against the return spring 46, and the tip of the plunger 38 is retracted.
In addition, the mounting protrusions 5 are provided on the lower surface of the component mounting portion 28 of the coil frame 25.
7 is provided, and the coil frame 25 is fixed to the printed board 14 by fitting in the mounting hole 58 formed in the printed board 14.

The movable frame 6 is supported by the tip of the plunger 38 so as to be movable in the moving direction of the reset member 4, and by pressing the reset member 4 from the return position against the coil spring 3 in the return state of the plunger 38. Movable frame locking part 40
Has a receiving portion 47 that is hooked by, and the receiving portion 47 is unlocked by the operation of the plunger 38. The movable frame 6 of the embodiment has a receiving portion 47 in the central portion, and a recess 6a having a lower surface opening for accommodating a head portion 38c at the tip of the plunger 38 in a vertically movable manner is formed below the receiving portion 47. A notch (not shown) is formed on the device 5 side to insert the neck portion 38a of the plunger 38. 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 movable contactor 7 has a base portion supported by the base 2 and a distal end portion engaged with the movable frame 25 to be pushed up by the movement of the resetting member 4 of the movable frame 25 in the returning direction, and is movable in the pushing up direction. It has a contact point 50 at the tip. The movable contactor 7 according to the embodiment has a pair, and one of them has a strip plate shape and is punched out so that the front end side is bent in a substantially Z shape, and the base end side is bent at a substantially right angle in the plate thickness direction. There is.
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. Then, a hole 51 is formed on the base end side of the pair of movable contacts 7, and the component mounting portion 28 of the coil frame 25 is formed.
The hole 51 is fitted and fixed to the protrusion 101 formed on the above. Further, a portion closer to the tip end of the movable contactor 7 than the punched-out portion of the Z-shape is engaged with the movable contactor pressing portion 48 of the movable frame 25, and the movable contact 50 is provided on the tip end side.
Is stuck. On the other hand, the base end of the movable contactor 7 penetrates the hollow portion 26a of the zero-phase current transformer 26, and
4, a retaining piece 52 cut and raised at the end of the movable contact 7 is passed through a through hole (not shown) and is soldered to the conductive pattern on the back surface. Therefore, the current flowing through the movable contact 7 is 1 of the zero-phase current transformer.
Become the next side. 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. Further, the movable frame 6 is biased by the movable contact 7 in the direction opposite to the return direction of the coil spring 3, but the spring force of the movable contact 7 is set to be weaker than the spring force of the coil spring 3.

The fixed contact 8 is supported by the base 2 and contacts the movable contact 50 at the reset position of the reset member 4. In the embodiment, the fixed contact 55 is formed in a substantially inverted L shape,
The fixed contact 8 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. Further, the lower end of the fixed contactor 55 is 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, soldered to a conductive pattern, and externally connected via the conductive pattern. It is connected to the terminals 30c and 30d. 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 to cover the front cover 11 with the back cover. The printed circuit board 14 and the coil frame 25 are sandwiched between the back cover 10 and the front cover 11 by being fixed to 10. In addition, 59 is the groove 5 of the concave groove 56.
6a is a retaining claw of the fixed contact 55 that is locked to 6a.

Reference numeral 68 denotes a contact point display member. The shaft portion 69 provided in the middle of the shaft support portion 92 provided in the component mounting portion 29 is formed between the bearing portion 93 and the printed circuit board 14 which are notched in a substantially semi-cylindrical shape. An off display portion provided on the opposite end portion, which is rotatably sandwiched and supported between the engaging pieces 71 provided on one end side, engages with an inclined elongated hole 70 formed obliquely to the horizontal on the movable frame 6. 72 is opposed to the component mounting hole 23 which serves as a display hole of the front cover 11.

The operation of the movable contact 7 will be described with reference to FIG. FIG. 6A shows the movable frame locking portion 41 of the reset member 4.
In this state, the receiving portion 47 of the movable frame 6 is locked, the movable contact 7 is pushed up by the spring force of the coil spring 3, and the movable contact 50 contacts the fixed contact 8. Therefore, the external connection terminals 30a and 30b and the external connection terminal 30
When there is no leakage current between c and 30d, a balanced current flows between the pair of movable contacts 7, so that no leakage response current is 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 external connection terminals 30a, 30b and the external connection terminals 30c, 30d is stopped and the leakage is interrupted. When the excitation current stops flowing through the coil 42 due to the stop of this current, the plunger 38
Is returned by the return spring 46, as shown in FIG. 6 (c). In this state, when the reset member 4 is compressed to press the coil spring 3 and moved to the reset position, the movable frame locking portion 40 and the receiving portion 47 slide along the guide inclined surfaces 40a and 47a to lock the movable frame. When the portion 40 engages with the receiving portion 47 and the pressure of the reset member 4 is released, the movable frame 25 is pulled up by the returning action of the coil spring 3, the movable contactor 7 is pushed up accordingly, and the movable contact 50 is fixed. Contact with, Figure 6
The state of (a) reset is completed.

Since the engaging piece 71 moves in conjunction with the above-described operation of the movable frame 25, the contact display member 68 is attached to the shaft portion 69.
5, the off display portion 72 is positioned below the component mounting hole 23 to perform an off display as shown in FIG.
The display member 68 rotates and the off display portion 72 separates from the display window 23.

According to this embodiment, the base 2 is housed in the cover 1 with the coil spring 3 interposed between the position of the insertion hole 24 of the base 2 and the reset member 4, and the spring support of the cover 1 is supported. The coil spring 3 is passed through the insertion hole 24 in the protrusion 9.
Therefore, the coil spring 3 can be easily attached and detached after the reset member 4 is arranged on the base 2 before the base 2 is housed in the cover 1. Further, by removing the base 2 from the cover 1, the coil spring 3 can be easily replaced even when the reset member 4 is provided.

Further, the base 2 is a printed circuit board on which a zero-phase current transformer 26 for detecting a leakage detection current flowing between the pair of movable contacts 7 and an amplifier 99 for amplifying the output of the zero-phase current transformer 26 are mounted. 14, the zero-phase current transformer 26 penetrates the base end sides of the pair of movable contactors 7.
Since the zero-phase current transformer 26 is directly penetrated without connecting another member such as a lead wire to the zero-phase current transformer 26, the work of penetrating the zero-phase current transformer 26 is facilitated.

Further, the base ends of the pair of movable contacts 7 are penetrated through the printed circuit board 14, and the movable contact 7 of the printed circuit board 14 is moved.
Since the long hole 89 longer than the width of the movable contact 7 is formed between the movable contacts 7, the base ends of the movable contacts 7 on the pattern side of the printed board 14 can be insulated, and the base ends of the movable contacts 7 can be separated from each other. It is possible to bring them closer to each other and to make them compact. Further, a printed circuit board holding portion 15 that abuts on the periphery of the printed circuit board 14 and holds the substantially central portion of the printed circuit board 14 at predetermined intervals.
Since the cover 1 is provided on the cover 1, the electronic components mounted on the printed circuit board 14 and the solder for attaching the movable contact 7 and the like can be accommodated even if they are protruding from the printed circuit board 14.

[0026]

According to the earth leakage relay of the first aspect of the present invention, the base is housed in the cover with the coil spring interposed between the position of the insertion hole of the base and the reset member and is inserted into the spring supporting protrusion of the cover. Since the coil spring can be supported through the hole, the coil spring can be easily attached and detached after the reset member is arranged on the base before the base is housed in the cover. Further, by removing the base from the cover, the coil spring can be easily replaced even when the reset member is provided.

According to the earth leakage relay of claim 2, claim 1
In addition to the above effect, since the movable contactor is directly passed through the zero-phase current transformer without connecting another member such as a lead wire to the movable contactor, the work of penetrating the zero-phase current transformer becomes easy. According to the earth leakage relay of claim 3, in addition to the effect of 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 made closer to each other. It can be made compact.

According to the earth leakage relay of claim 4, claim 2
Alternatively, in addition to the effect of the third aspect, the electronic component mounted on the printed circuit board and the mounting solder for the movable contact or the like can be stored even if protruding from the printed circuit board.

[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 for explaining the operation of the movable contactor.

[Explanation of symbols]

1 cover 2 base 3 coil spring 4 Reset member 5 Electromagnet device 6 movable frame 7 Movable contact 8 fixed contacts 9 Spring support protrusion 14 Printed circuit board 15 Printed circuit board holder 24 insertion holes 26 Zero-phase current transformer 38 Plunger 40 Movable frame locking part 47 Receiver 50 movable contacts 89 long hole

─────────────────────────────────────────────────── ─── 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 (4)

(57) [Claims] 1. A cover having a spring support protrusion therein,
A base housed in the cover and having an insertion hole through which the spring support protrusion is inserted; a coil spring whose one end is supported by the spring support protrusion inserted through the insertion hole; and a movable frame locking portion. A reset member that is supported by the other end of the coil spring and that moves between a reset position and a return position that has moved against the spring force of the coil spring, and that is supported by the base and is excited by a leakage response current. An electromagnet device having a plunger that operates in a direction that intersects with the moving direction of the reset member, and the reset member that is supported by the tip of the plunger so as to be movable in the moving direction of the reset member and returns the reset member in the return state of the plunger. The movable frame locking portion is hooked by being pressed against the coil spring from a position, and the receiving portion is locked by the operation of the plunger. A movable frame to be removed and a movable contact pointed in the push-up direction while being pushed up by the movement of the reset member of the movable frame in the returning direction when the base portion is supported by the base and the tip end is engaged with the movable frame. An earth leakage relay comprising: a movable contactor provided at the tip portion; and a fixed contact which is supported by the base and contacts the movable contact at the reset position of the reset member. 2. The base is arranged so that a zero-phase current transformer that detects a leakage detection current flowing between a pair of the movable contacts and a penetration direction of a primary side of the zero-phase current transformer are perpendicular to each other. It has a printed circuit board on which the zero-phase current transformer is mounted and electronic components for amplifying the output of the zero-phase current transformer are mounted, and the zero-phase current transformer is penetrated through a base end side of a pair of movable contacts. The earth leakage relay according to claim 1. 3. A long hole longer than the width of the movable contact is formed between the movable contacts of the printed board by penetrating the base ends of the pair of movable contacts into the printed board. Leakage relay described. 4. The earth leakage relay according to claim 2 or 3, wherein the cover is provided with a printed circuit board holding portion which is in contact with the periphery of the printed circuit board and holds substantially central portions of the printed circuit board at predetermined intervals.