JP3267012B2 - Electromagnetic contactor for printed board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charging unit such as a power supply terminal for an electromagnetic coil connected to a printed board, and input and output external terminals on one surface of a substantially rectangular housing. A charging unit that covers a charging unit located outside the housing of an electrical device for a printed board typified by an electromagnetic contactor for a printed board and that protects the charged unit, including a connection unit for connecting the unit to the printed board. It relates to the structure of a protective cover.

[0002]

2. Description of the Related Art First, FIG. 6 shows an example of the structure of an electromagnetic contactor for a printed circuit board, which is a representative example of an electric device for a printed circuit board having an external structure to which the present invention is applied. A flat upper surface of a substantially rectangular housing (hereinafter also referred to as a fixed frame or a frame) accommodating an opening / closing function member such as a main contact, an electromagnet for driving the movable side of the main contact, and an open / close spring. The external terminal of the power supply side fixed terminal 2, the load side fixed terminal 3, the connection part of the coil terminal 4 for supplying power to the electromagnetic coil of the electromagnet inside the housing with the printed board (not shown) have the same connection surface. They are arranged so as to be located in a plane, and these connection surfaces are brought into contact with the printed board to enable direct connection with a printed board conductor. In the figure,
Reference numeral 5 denotes a longer creepage insulation distance between the connection portions, which is formed between the connection portions of the power supply-side fixed terminal 2 and the load-side fixed terminal 3 and the connection portion of the coil terminal 4. The frame recesses 6a and 6b for securing are pedestal mounting ears.

FIG. 7 shows a state in which an electromagnetic contactor having such an external structure is mounted on a printed board. A main circuit conductor 11 is attached to the substrate of the printed circuit board 10. After the connection surfaces of the external terminals shown in FIG. Then, the electromagnetic contactor is mounted on the printed board 10 by screwing into the screw holes. In this way, the electromagnetic contactor having the printed board 10 mounted on the side of the housing on which the charging section connection section is provided is mounted on the mounting base 1.
2 is fixed using a screw 9 and a nut (not shown). Although not shown here, control parts such as a reactor, a control transformer, a diode module forming a diode bridge, and a transistor module forming a transistor inverter are fixed to the mounting base 12. Connected to the control panel.

Conventionally, as shown in FIG. 8, a protective cover for protecting the charged portion located outside the housing of the electromagnetic contactor mounted on the printed board has a rectangular cylindrical shape. Prior to mounting the electromagnetic contactor on the printed circuit board, the protective cover 13 is fitted in the direction of arrow C, and then the connection surfaces of the terminals of the electromagnetic contactor are brought into contact with the printed circuit board, and Screws were screwed into each terminal from the back side, and the electromagnetic contactor was mounted on a printed board. In the mounted state, as shown in FIG. 9, the protective cover 13 is restrained from moving toward the near side by the pedestal mounting ears 6a, and the charged portion is surrounded by the protective cover 13 all around, thereby preventing electric shock. In addition, a short circuit between phases is prevented by the dustproof effect of the protective cover 13.

[0005]

As described above, in the conventional protective cover, it is necessary to fit the electromagnetic contactor into the electromagnetic contactor before mounting it on the printed circuit board. The positioning with the printed board conductor had to be done by groping, and the mounting work was not always easy. Further, as shown in FIG. 9, since the degree of sealing is low when the electromagnetic contactor is mounted on the printed board, foreign matter easily enters through a gap between the housing and the protective cover cannot be removed in the mounted state. Even if the presence of foreign matter cannot be checked at all times, and the protective cover is made of a transparent insulating material and the presence of foreign matter can be confirmed, the foreign matter can be checked from the arc outlet of the housing located inside the protective cover. There is a problem that the contactor cannot be removed before falling into the body, and the contactor is likely to malfunction.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to facilitate the mounting work of an electromagnetic contactor, and to provide a high degree of sealing so that entry of foreign matter hardly occurs. Charged part protective cover that can remove
An object of the present invention is to provide a printed board electromagnetic contactor provided with the same.

[0007]

In order to solve the above problems SUMMARY OF THE INVENTION In the present invention, the feeding terminal and the input side of the electromagnetic coil, from the side of the housing comprising the respective external terminals of the box-shaped output side
Led out to the upper surface of the housing along the side surface, and the upper surface of the housing
The connection between the power supply terminal and each external terminal located at
Connect to the printed board arranged on the top surface,
Connect the external terminals on the input side and output side
The protective cover for the charged part to be covered is attached to the housing.
In the electromagnetic contactor for a printed board, the protective cover for the live part may be
Is formed in a U shape so as to cover the external terminal on the input side.
Cover and the external terminal on the output side
And the other U-shaped cover formed in a U-shape
Make up each of said one and the other U-shaped cover
And an engaging portion is provided on the housing.
Formed engaging part, and printed board was arranged on the upper surface
The one and the other U-shaped covers are provided on the engagement portion of the housing.
And the other of the U-shaped covers
A protective cover made of
I want to wear it.

Here, it is extremely preferable to form the protective cover with an insulating material made of a transparent synthetic resin.
It is particularly preferable that a concave portion into which the conductor of the printed board is fitted is formed on the printed board side of the U-shaped cover mounted on the housing .

A U-shaped cover pre - mounted on a housing is provided.
It is preferable to form an inclined surface extending toward the printed board side on the printed board side . Further, it is more preferable that at least one of the U-shaped covers 3 is provided with a hole or a slit for ejecting arc heat.

[0010]

When the charging section protection cover is formed in this manner, the charging section protection cover can be attached and detached while the electromagnetic contactor body is mounted on the printed board. The mounting of the electromagnetic contactor main body can be preceded in a state where the portion is exposed, and the mounting operation is significantly facilitated. In addition, since the U-shaped cover is provided with projections and depressions that engage with the projections and depressions of the housing of the electromagnetic contactor, one-touch mounting becomes possible. Therefore, when two U-shaped covers having this structure are used, the charged portion can be easily protected over the entire circumference.

[0011] Further, when the charged portion protection cover is formed of an insulating material made of a transparent synthetic resin, it is easy to find the foreign material when foreign material enters, and the connection state between the printed board and the charged portion is improved. The nameplate on the side of the housing can be visually checked, and higher safety and reliability can be obtained. In addition, when a concave portion in which the conductor of the printed board is fitted is provided on the printed board side of the U-shaped cover, the degree of sealing of the cover is further increased, making it more difficult to cause a short circuit between phases, and ensuring high safety. be able to.

Also, the U-shaped cover is provided on the printed board side.
If an inclined surface that spreads toward the printed board side is formed , foreign matter riding on the central surface of the cover near the printed board slips off the inclined face and separates from the printed board, and the short circuit between the phases is more reliably prevented, and safety is improved. Further, if holes or slits for arc heat ejection are provided on at least one of the U-shaped covers 3, the arc heat ejected from the arc ejection holes of the electromagnetic contactor housing at the time of current interruption is transmitted from the holes or slits. Since it goes out to the outside and does not stay inside, by selecting the surface of the U-shaped cover 3 on which the foreign matter is unlikely to enter, and providing holes or slits, the life of the charged part protection cover due to heat is prevented from being shortened. Is done.

[0013]

FIG. 1 shows a first embodiment of a charging section protection cover structure according to the present invention. The cover is formed in a U-shape as a whole, and the upper surface 14a, both side surfaces 14b, 14b,
d. The front edge of the upper surface 14a, that is, the edge portion 14c on the printed board side is formed on an inclined surface over the entire length, and foreign matter riding on the upper surface near the printed board slides off the inclined surface and away from the printed board, causing an interphase short circuit. It is difficult. Also, a convex portion 15 is formed on both sides 14b, 14b of the cover 14 on the front side, and this convex portion engages with the concave portion 5 (FIG. 6) of the frame. Also, both sides 14 of the cover
A hooking projection 16 is formed on the rear side of b and 14b, and this hooking projection hooks on a hooking surface 8b (FIG. 6) on the side surface of the electromagnetic contactor housing. This hooking surface 8b is shown in FIG.
3A, a surface of a concave portion formed in a wide groove shape with a shallow bottom below the coil terminal 4 is formed. When mounting the electromagnetic contactor using the protection cover for a charging section on a printed board, first, the electromagnetic contactor body is attached to the printed board 10 in the same manner as the conventional example shown in FIG. 14 is pressed from above while maintaining the vertical direction of FIG. 1, and each convex portion of the protective cover 14 is engaged with each concave portion of the electromagnetic contactor housing. The state at this time is shown in FIG. Here, in order to eliminate backlash in the X direction, the height of the protective cover in the front-rear direction is adjusted by the main circuit conductor 1 of the frame.
The height is set so as to be fitted in a static fit between the housing 1 and the mounting ear 6a of the housing.

FIG. 3 shows an example of how to use the charging section protection cover according to the present invention. When it is desired to protect the charged portion over the entire circumference as in the conventional protective cover 13 (FIG. 8), two protective covers according to the present invention are used as shown in FIG. , The entire circumference can be easily covered by pushing in the direction of arrow B.
In the figure, the lower (load-side) protective cover does not have a rear surface, but this does not have a part protruding below the flat lower surface on the lower surface side of the electromagnetic contactor housing, and therefore the height of the rear surface Can be considered as a cover that can be almost zero.

FIG. 4 shows a second embodiment of the charging section protection cover structure according to the present invention. This structure is different from that of the first embodiment in that a concave portion 17a is formed at the front edge of the upper surface of the U-shaped charging portion protective cover 17, and the main circuit conductor 11 of the printed board 10 is formed in the concave portion 17a. The point is that they are fitted closely. By doing so, the power supply side of the charging part of the electromagnetic contactor side is covered in a sealed state, and the occurrence of short-circuiting between phases due to foreign matter intrusion is almost completely prevented.

FIG. 5 shows a third embodiment of the charging section protection cover structure according to the present invention. If a slit 18 for arc heat ejection is provided on the upper surface 14a of the U-shaped protective cover as in this embodiment, the arc heat ejected from the arc ejection port of the electromagnetic contactor housing at the time of current interruption is ejected from the slit 18 to the outside. In addition, since the cover does not stay inside the protective cover 14, it is possible to prevent the life of the cover from being shortened. In this embodiment, the slit 18 is provided on the upper surface 14a of the cover 14. Therefore, except in a clean use environment, the slit 18 is used on the load side of the charging section and the power supply side is provided with a slit-free cover. This makes it possible to form a long-life protective cover that prevents short circuit between phases and electric shock.

[0017]

According to the present invention, the electromagnetic contactor for a printed circuit board, which is a representative example of the electrical equipment for a printed circuit board, has the above-described structure, and the following effects can be obtained. According to the first aspect of the present invention , (1) Since the protective cover is formed in a U-shape, the cover can be attached and detached while the electromagnetic contactor body is mounted on the printed board, and the charged portion is exposed at the time of mounting. Thus, the mounting of only the electromagnetic contactor body can be performed first, and the mounting operation becomes extremely easy.

(2) Since the concave and convex portions which engage with the concave and convex portions of the electromagnetic contactor housing are provided inside the U-shaped three surfaces of the U-shaped cover,
One-touch attachment / detachment is now possible. In addition, since the structure is highly sealed, it is difficult for foreign matter to enter the inside of the cover, and even if foreign matter enters, the cover can be attached and detached with the electromagnetic contactor body mounted. In addition, the work of confirming and removing foreign matter can be easily performed, the occurrence of short-circuit between phases of the main circuit of the electromagnetic contactor can be easily prevented, and the operation reliability of the control system including the electromagnetic contactor can be improved.

(3) At first glance, the protective cover of this structure looks complicated and expensive as compared with the conventional protective cover (FIG. 8, reference numeral 13), but is mass-produced by synthetic resin molding using a mold. Since the cost of the mold alone to the cover alone is extremely small and the cost of the unit is almost entirely occupied by the material cost, the cover of the present invention can be manufactured at a lower cost because of the lower material cost when compared with each other. It is possible, and the cost is almost the same for the first time when the same function as the conventional one is aimed at by using two of them to cover both the entire circumference of the charged portion and to provide both functions of electric shock prevention and inter-phase short circuit prevention. Since there are many cases where both functions are not necessarily required in practical use, the cost of the cover itself can be reduced as a whole by employing the structure of the present invention for the protective cover.

According to the second aspect of the present invention , since the protective cover is transparent, it is easy to detect when a foreign object has entered the charged part, and the connection state of the charged part and the nameplate on the side surface of the electromagnetic contactor housing are facilitated. Can be visually observed, and safety is improved.
In the invention according to claim 3 , the degree of sealing is further increased,
It becomes more difficult to generate an interphase short circuit, and safety is improved.

According to the fourth aspect of the present invention , the chance of entry of foreign matter is reduced, and safety is improved. According to the fifth aspect of the invention , the life of the cover itself is prevented from being shortened, and an economical advantage is obtained.

[Brief description of the drawings]

FIG. 1 is a view showing a first embodiment of a charging portion protection cover structure according to the present invention, wherein FIG. 1 (a) is a front perspective view and FIG. 1 (b) is a rear perspective view.

FIG. 2 is a printed circuit board electromagnetic contactor mounting perspective view showing a state in which the charging unit protection cover shown in FIG. 1 is mounted on an electromagnetic contactor body previously mounted on the printed circuit board;

FIG. 3 is a perspective view showing an example of a method for using a charging section protection cover according to the present invention.

FIG. 4 is a perspective view showing a second embodiment of the charging section protection cover structure according to the present invention, which is mounted on an electromagnetic contactor body mounted on a printed board;

FIGS. 5A and 5B are views showing a third embodiment of the charging section protection cover structure according to the present invention, wherein FIG. 5A is a front perspective view and FIG.

FIGS. 6A and 6B are views showing an example of an external structure of a printed board electromagnetic contactor to which the present invention is applied, wherein FIG. 6A is a perspective view and FIG.

FIG. 7 is a perspective view showing a state where the electromagnetic contactor shown in FIG. 6 is mounted on a printed board;

8A and 8B are diagrams showing a structure of a conventional protection cover for a charging section and a method of attaching the protection cover to an electromagnetic contactor, wherein FIG. 8A is a perspective view of the protection cover, and FIG. Is a perspective view showing the external structure of the electromagnetic contactor

9 is a perspective view showing a state in which the protective cover shown in FIG. 8A is fitted into the electromagnetic contactor shown in FIG.

[Explanation of symbols]

 2 Fixed terminal on power supply side (external terminal) 3 Fixed terminal on load side (external terminal) 4 Coil terminal (power supply terminal) 5 Depression (recess of housing) 8b Hooking surface (recess of housing) 10 Printed board 11 Main circuit conductor 13 Charger protection cover 14 Charger protection cover 14a Upper surface 14b Side surface 14c Inclined surface 15 Convex portion 16 Convex portion 18 Slit

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-230626 (JP, A) JP-A-4-267025 (JP, A) JP-A-7-65683 (JP, A) JP-A-6-63 236722 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01H 50/02 H01H 50/04 H01H 50/14

Claims (5)

(57) [Claims] 1. A along the feeding terminal of the electromagnetic coil input, the side surface from the side of the external terminals consist of a box-shaped housings of the output side
Drawn out on the upper surface of the housing, and located on the upper surface of the housing
The connection part between the power supply terminal and each external terminal is arranged on the upper surface of the housing
Connected to the printed circuit board and the side of the housing
Charger that covers the external terminals on the input and output side
Printed board having a protective cover attached to the housing
In the electromagnetic contactor for use, the charging unit protection cover, the
One side is formed in a U-shape to cover the external terminal on the input side
Cover so as to cover the U-shaped cover and the external terminal on the output side.
And the other U-shaped cover formed in a U-shape.
An engaging portion is provided on each of the one and the other U-shaped covers.
And an engaging part with which the engaging part is engaged with the housing.
Forming a joint and forming the printed circuit board on the upper surface of the housing.
The engaging portions of the one and other U-shaped covers are engaged with the engaging portions.
Engage with said one and other U-shaped cover
The charging section protection cover is detachably attached to the housing.
An electromagnetic contactor for printed circuit boards characterized by the following . 2. An electromagnetic contact for a printed board according to claim 1.
The electromagnetic contactor for a printed board, wherein the charging unit protection cover is an insulating material made of a transparent synthetic resin. 3. The electromagnetic contact for a printed board according to claim 1.
In the contactor , the printed board is a conductor protruding toward the housing.
And the printed board side of the U-shaped cover attached to the housing
An electromagnetic contactor for a printed board , comprising: a recess in which the conductor is fitted. 4. An electromagnetic contact for a printed board according to claim 1.
Print of a U-shaped cover attached to the housing on a tentacle
An electromagnetic contactor for a printed board , wherein an inclined surface extending toward the printed board is formed on the board side . 5. An electromagnetic contact for a printed board according to claim 1.
In touch device, the electromagnetic contactor printed board, characterized in that a hole or slit for arc heat released to the U-shaped cover.