JP2003534655A - Electromagnetic coil device - Google Patents

Abstract

(57) [Summary] In an electromagnetic coil device (10) including a winding frame (12) equipped with a winding and a metal casing (13) surrounding the winding frame equipped with the winding, a plurality of contact pieces ( 15) is held in one plug base (14), one of said contact pieces being used as a protective conductor connection terminal. The contact piece used as a protective conductor connection terminal is held in a metal casing via one metallic coupling member (21). Plastic is filled in a free space between the winding frame equipped with a winding, the metal casing, and the insertion base. Moisture can penetrate into the electromagnetic coil device along the interface between the metal part and the plastic. In order to prevent the moisture from reaching the connection chamber connecting the power supply line coming from the outside to the contact piece, an area of the contact piece used as the protective conductor connection terminal, which engages with the coupling member, is inserted. It is located inside the base. A sealing member (23) is arranged between the coupling member and the plug base, wherein a first sealing surface of the sealing member is on the coupling member and another sealing surface is on the plug base. It is in contact with the seat. The electromagnetic coil device is provided for operating a valve used in fluid technology.

Description

Detailed Description of the Invention

TECHNICAL FIELD: The present invention relates to an electromagnetic coil device of the type specified as a superordinate concept of the invention of claim 1, in particular for operating a valve.

BACKGROUND OF THE INVENTION An electromagnetic coil device of the above type is known from German Patent DE 4341087. A reel is arranged in the metal casing,
The bobbin is provided with electrical windings. The insertion base having a plurality of contact pieces is held in the metal casing via a metallic coupling member. One of the contact pieces is connected to the metal casing as a protective conductor connecting terminal via a connecting member. The ends of the coil windings are connected to the other two contact pieces. The free space between the wound bobbin of the winding, the metal casing and the insert base is filled with plastic. Moisture can enter the electromagnetic coil system through the interface gap between the metal casing and the plastic. In order to prevent moisture from entering along the contact piece used as the protective conductor connection terminal and passing through the base seat and entering the connection chamber,
A seal ring surrounding the coupling member is provided between the contact piece used as the protective conductor connection terminal and the metal casing. During assembly prior to exterior injection molding, the coupling member is press fit into the recess of the metal casing and the recess of the contact piece.
The sealing ring is then clamped between the metal casing and the contact piece. Due to the curvature of the metal casing, the distance between the contact piece and the metal casing is different in the contact area of the seal ring, so that the seal ring is displaced more or less outwards. As a result, the seal ring will be deformed non-uniformly over its entire circumference. As a result, the free peripheral surface of the seal ring, that is, the seal ring surface not in contact with the metal portion, comes into contact with the plastic during exterior injection molding. Due to the high temperature of the plastic during exterior injection molding, the seal ring material is subjected to a strong heat load. Not only that, but after a certain degree of shrinkage of the plastic, which is always expected to cure, to ensure a satisfactory sealing action between the plastic and the free sealing ring surface before exterior injection molding. Is impossible at all. Therefore, the moisture reaching the seal ring through the gap between the metal casing and the plastic causes the gap between the seal ring and the plastic adjoining the seal ring and the gap between the contact piece and the insertion base. Or, there is a risk of entering the connection chamber through the gap between the contact piece and the plastic.

DISCLOSURE OF THE INVENTION The object of the invention is to improve an electromagnetic coil arrangement of the type mentioned at the outset of the specification such that an electromagnetic coil arrangement is provided through the gap between the metal casing and the plastic adjoining it. Is to prevent the liquid that has entered into the connection chamber from further advancing into the connection chamber.

The above problem is solved by the constituent means described in the characterizing part of claim 1. In the electromagnetic coil device of the present invention, the sealing member is not in contact with the contact piece used as the protective conductor connecting terminal or the metal casing. Since the contact piece region that engages the coupling member extends inside the bayonet base, it is sufficient that the sealing member abuts the coupling member on one side and the bayonet base on the other side. Since the sealing member is already loaded with force before the outer injection molding of the electromagnetic coil device, the pressure of the plastic during the outer injection molding and in the subsequent cooling period is not a problem for the sealing action. In addition, shrinkage of the plastic during the cooling period is not a problem for the sealing action. The sealing element can be arranged between the coupling element and the plug-in base with a radial or axial sealing effect.

Advantageous constructions of the invention are as described in the dependent claims. If the sealing member is arranged with a radial sealing action, it is adapted to the outer contour of the sealing member,
It is advantageous to arrange the sealing member in the recess of the plug-in base. When the recessed portion is deeper than the wall thickness of the sealing member, the sealing member can be displaced in the axial direction in the escape direction. That is, the sealing member has a substantially elliptical cross section or an oval cross section in the assembled state. The collar of the coupling member defines the distance between the metal casing and the plug-in base surface close to the metal casing. If the outer diameter of the collar is larger than the inner diameter of the recessed portion, no plastic will reach the sealing member during exterior injection molding of the electromagnetic coil device. Furthermore, the collar part that abuts the bayonet base prevents the coupling member from being pulled out of the bayonet base when subjected to a strong pulling action. Alternatively to arranging the sealing member with a radial sealing action,
In the present invention, it is also possible to arrange the sealing member with an axial sealing action. In this case, the coupling member has a collar that abuts the insertion base when press-fitting the coupling member into the contact piece held in the insertion base, thus limiting the force acting on the sealing member. There is. The collar additionally prevents contact of the sealing member with the hot plastic during exterior injection molding. If the coupling member is designed to be rotationally symmetrical at least in the sealing area, a commercially available inexpensive O-ring can be used as the sealing member. When one side surface of the insertion base has one projecting portion between the outward side of the insertion base and the side near the metal casing, the shape-fitting type joint is As a result, the joint prevents the plug-in base from being pulled out of the plastic molding, even when a strong tensile load is applied to the contact piece or the coupling member. If one or more recesses surrounding the coupling member are provided on the side of the plug-in base close to the metal casing, a seal is formed in the boundary area between the plug-in base and the plastic used for exterior injection molding. The stopping action is improved, and the recess facilitates fusion bonding during exterior injection molding or acts as a labyrinth packing. The manufacture of the plug-in base is simplified if only the contact-piece segment of the contact piece used as the protective conductor connection terminal of the coupling member is retained in the plug-in base. The contact piece is pushed into the notch of the insertion base after the insertion base is manufactured. In that case,
Advantageously, the cutouts are arranged perpendicular to the cutouts provided for the coupling member. In order to further improve the sealing effect against moisture ingress into the connection chamber, it is advantageous if the contact pieces used as protective conductor connection terminals are retained only in the plug-in base.

[0006]   BEST MODE FOR CARRYING OUT THE INVENTION:   Next, an embodiment of the present invention will be described in detail with reference to the drawings.

1 and 2 are different sectional views of a part of an electromagnetic coil device 10 according to a first embodiment of the present invention. That is, FIG. 1 is a vertical cross-sectional view of the electromagnetic coil device 10, and FIG. 2 is a horizontal cross-sectional view taken along the line AA of FIG. FIG. 3 is an exploded view of the structure of FIG. 2 in order to clarify the individual parts of the electromagnetic coil device 10 shown in FIGS. 1 and 2. However, the same reference numerals are given to the same components in the drawings.

The winding frame 12 equipped with the winding wire 11 is surrounded by a pot-shaped metal casing 13. Plug-in base 14 made of electrically insulating material, for example plastic
Inside thereof, one contact piece 15 used as a protective conductor connecting terminal and a plurality of other contact pieces are arranged, and the end portion of the winding 11 is connected to the contact piece 15. The other contact pieces and the winding ends are omitted in FIGS. 1 to 3 for the reason of making the drawings easy to understand. The contact piece 15 is surrounded by the material of the plug-in base 14 except for the protruding region 15 a that projects into the connection chamber 16. When manufacturing the plug-in base 14, the contact piece 15 is inserted into an injection mold and then embedded with plastic. In FIG. 2, the connection chamber 16 is closed by a cap 17, which is shown schematically. The ring-shaped packing 18 prevents moisture from entering the connection chamber 16.

In the cutout portion 20, a single bolt-shaped metallic coupling member 21 is arranged. The contact piece 15 is mechanically held by the metal casing 13 via the coupling member 21 and is also electrically connected to the metal casing. An O-ring 23, which is used as a sealing member, is arranged on the side closer to the metal casing 13 in the recessed portion 22 that extends concentrically with the cutout portion 20 in the insertion base 14.
Both the recess 22 and the sealing area 21a of the coupling member 21 have a circular cross section in the sealing area. The inner diameter of the recessed portion 22, the outer diameter of the sealing region 21a, and the O-ring 23 are adjusted to each other so that the O-ring seals in the radial direction. The recessed portion 22 is the coupling member 21.
The thickness is larger than the thickness of the O-ring 23 when viewed in the axial direction. Therefore, the O-ring 23 can be displaced in the axial direction. The collar 21b having an outer diameter larger than the inner diameter of the recess 22 closes the recess 22. The wall thickness of the collar determines the spacing between the metal casing 13 and the bayonet base 14. As can be seen in particular in FIG. 2, the collar 21b only rests linearly on the metal casing 13 due to the curvature of the metal casing 13. The coupling member 21 has a tooth row 21c press-fitted into the corresponding through hole of the contact piece 15. The coupling member 21 also has a further tooth row 21d, which tooth row is
It is press-fitted into the corresponding through hole of the metal casing 13. The internal thread 21e is
The screw connection makes it possible to fix the cap 17 to the electromagnetic coil device 10. Furthermore, the collar 21b prevents the coupling member 21 from slipping out of the insertion base 14.

Before the exterior injection molding of the electromagnetic coil device 10, the O-ring 23 is fitted over the sealing area 21a. Next, the connecting member 21 together with the O-ring 23 is pushed into the insertion base 14 until the collar 21b comes into contact with the insertion base 14 and is in surface alignment. As a result, the recessed portion 22 is closed so that plastic does not reach the recessed portion 22 during the subsequent exterior injection molding. At the next manufacturing stage, the collar 21b becomes the metal casing 13
The tooth row 21d of the coupling member 21 is press-fitted into the metal casing 1 until it contacts with.
The contact piece 15 is now electrically connected to the metal casing 13 and the insert base 14 is held in a specific position on the metal casing 13 for exterior injection molding. After this preparatory step, the bobbin 12 equipped with the winding 11 becomes
3 and the end of the winding 11 is conductively coupled to a connecting piece corresponding to the end. The structure is conventionally coated with injection molded plastic. At that time, the heated plastic flows into the free space and fills it. The area filled with the plastic after the exterior injection molding is cured and then designated by reference numeral 2 in FIGS.
The plastic molding shown by 5 is formed.

As shown in FIG. 1, the two side surfaces of the insertion base 14 have projecting portions 14 a and 14 b. The two protruding portions 14a and 14b are provided on the outer side 14c of the insertion base 14 and
It is arranged between the plug-in base 14 and the side 14d of the plug-in base 14 which is close to the metal casing 13, and the two projecting parts may be arranged such that the plug-in base 14 is provided via the contact piece 15 or via another contact piece. Alternatively, the insertion base 14 is formed so as not to be pulled out from the plastic molded body 25 even when subjected to a strong pulling action, even through the connecting member 21.

On the side 14 d of the insertion base 14 near the metal casing 13, three recesses 14 are formed.
e, 14f, 14g are provided. The recesses 14e, 14f, and 14g concentrically surround the coupling member 21 as a groove closed in an annular shape. The recess is used as a melting edge which is melted by the high temperature plastic and fused with the plastic during exterior injection molding of the electromagnetic coil device. The melting temperature of the synthetic resin used for the plastic molding 25 is chosen to be higher than the melting temperature of the synthetic resin used for the insert base 14. The recesses 14e, 14f, 14g are used as so-called labyrinth packings that prevent further transfer of invading moisture, unless a complete fusion is performed or intended. In this way, the interface between the insert base 14 and the plastic molding 25 can be reliably sealed against the ingress of moisture.

On the other hand, in the case of the interface between the metal and the plastic, such as between the metal casing 13 and the plastic molding 25, and between the contact piece 15 and the plug-in base 14, the plug-in The situation is different from the case of the interface between the base 14 and the plastic molding 25. The gaps that allow the ingress of moisture are unavoidable here. Therefore, moisture that has entered from the outside through the gap between the metal casing 13 and the plastic molded body 25 passes through the gap between the connecting piece 15 and the plastic of the insertion base 14 that is in contact with the connecting piece 15. Additional measures must be taken to prevent reaching the interior of the connection room 16. For this purpose, the present invention is provided with an O-ring 23 which is used as a sealing member, which contacts both the coupling member 21 and the insertion base 14 and has a radial sealing action. is doing. Moisture entering through the gap between the metal casing 13 and the plastic molding 25 can reach only the O-ring. Conventionally, moisture was introduced into the connection chamber 16 through the gap between the contact piece 15 and the insertion base 14, but as described above, due to the O-ring 23, moisture is no longer present in the gap. Can't reach

The recessed portion 22 and the collar 21b of the coupling member 21 form a single chamber having an annular cross section, and the O-ring 23 in the chamber forms a high heat plastic compound during exterior injection molding. Protected against contact. Since the O-ring 23 does not come into direct contact with the high-temperature plastic, the heat load on the O-ring 23 at the time of exterior injection molding is only slight. The mechanical stress of the O-ring 23 is also small. This is because the O-ring has to be sealed only in the radial direction, and the O-ring can escape in the recess 22 in the direction of the axis of the coupling member 21.

FIG. 4 is a cross-sectional view of an electromagnetic coil device 10 ′ according to a second embodiment of the present invention, which corresponds to FIG. 2. In this case, the same components as those in the first embodiment are designated by the same reference numerals.
The cap closing the connection chamber 16 is given the reference numeral 17 '. Unlike the cap 17 shown in FIG. 2, the cap 17 ′ with the packing 18 has a plug-in base 1
It is mounted on 4 '. The connecting member between the metal casing 13 and the contact piece 15 is designated by 21 '. The O-ring 23 is arranged between the insertion base 14 'and the collar 21b' of the coupling member 21 'with an axial sealing action. The collar 21b 'defines the spacing between the metal casing 13 and the plug-in base 14'. Furthermore, the collar 21b 'determines the distance between the surface of the insert base 14' against which the O-ring 23 abuts and the surface of the coupling member 21 '. As a result, the connecting member 2
The force acting on the O-ring 23 in the axial direction of 1'is limited. However, it is not necessary for the O-ring 23 to abut the coupling member 21 'with a radial sealing action. This is because the force acting on the O-ring 23 in the axial direction has already caused the sealing action. Since the inner diameter of the collar 21b 'is larger than the outer diameter of the O-ring 23, the O-ring 23 can be displaced radially away when subjected to an axial load. The collar 21b 'additionally prevents the O-ring 23 from coming into contact with the hot plastic during external injection molding. Also in this embodiment, the metal casing 1
It is only up to the O-ring 23 that the invading moisture can reach through the gap between the 3 and the plastic molding 25. However, due to the sealing action of the O-ring 23, the invading moisture is further absorbed into the contact piece 15 and the insertion base 14 '.
It does not reach into the gap between and through which the moisture is guided into the connection chamber 16.

5 and 6 are different sectional views of a part of an electromagnetic coil device 10 ″ according to a third embodiment of the present invention. In that case, FIG. 5 is a longitudinal section of the electromagnetic coil device 10 ″ corresponding to FIG. It is a side view. However, in FIG. 5, only the section of the electromagnetic coil device 10 ″ which is different from the electromagnetic coil device 10 shown in FIG. 1 is shown. FIG. 6 shows the electromagnetic coil device 10 ″ shown in FIG. FIG. 4 is an exploded view corresponding to FIG. 3 for clarifying individual parts of FIG. In this case, the same components are designated by the same reference numerals.

The electromagnetic coil device 10 ″ of the third embodiment differs from the electromagnetic coil devices 10 and 10 ′ shown in FIGS. 1 to 4 in that the contact piece 15 is arranged in the insertion base. The insertion base is indicated by reference numeral 14 ″ in FIGS. In the electromagnetic coil devices 10 and 10 ′, the contact piece 15 is embedded in the insertion base 14 (FIGS. 1 to 3) or the insertion base 14 ′ (FIG. 4) by injection molding, while the contact base 15 is inserted. The seat 14 ″ has an additional notch 28 which is arranged perpendicular to the notch 20 for receiving the coupling member 21. The notch 28 is It is used for accommodating the contact strip area 15b of the contact strip 15. The contact strip area 15b has one through hole 29. The advantage obtained with this construction is that the plug base It is not necessary to insert the contact piece 15 into the injection mold when manufacturing the 14 ″. The contact piece 15 should be formed before the exterior injection molding of the electromagnetic coil device 10 ″.
It is introduced into the notch 20 of the insertion base 14 ″. The O-ring 23 is the collar 21.
After being fitted over the connecting member 21 until it comes into contact with b, the connecting member 21 is pushed into the notch 20 together with the O-ring 23, and the collar 21b is inserted into the base 14 ".
The contact area 21c of the coupling member 21 is press-fitted into the through hole 29 of the contact piece 15 until it comes into contact with As a result, the contact piece 15 is inserted into the insertion base 1 even in the subsequent processing stage.
4 "is prevented from slipping off. After pressing the toothing 21d of the coupling member 21 into the metal casing 13, the following processing steps are carried out as already explained in connection with FIG.

The cap that surrounds the connection chamber is not shown in FIG. The cap is
As shown in FIG. 2, it is configured to be mounted on the plastic molded body 25.

[Brief description of drawings]

[Figure 1]   FIG. 3 is a vertical sectional view of a part of the electromagnetic coil device according to the first embodiment of the present invention.

[Fig. 2]   FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1.

[Figure 3]   FIG. 3 is an exploded view of individual parts of the electromagnetic coil device shown in FIGS. 1 and 2.

[Figure 4]   FIG. 9 is a transverse cross-sectional view of the electromagnetic coil device according to the second embodiment of the present invention, which corresponds to FIG. 2.

[Figure 5]   It is a longitudinal cross-sectional view of the electromagnetic coil device by 3rd Embodiment of this invention corresponded to FIG.

[Figure 6]   FIG. 6 is an exploded view of individual parts of the electromagnetic coil device shown in FIG. 5.

[Explanation of symbols]

10, 10 ', 10 "electromagnetic coil device, 11 windings, 12 reels, 1
3 pot-shaped metal casing, 14, 14 ', 14 "insertion base, 14
a, 14b Convex portion, 14c Outward side, 14d Metal casing side, 14e, 14f, 14g Recess, 15 Contact piece, 15a Projection area,
15b contact piece area, 16 connection chamber, 17, 17 'cap, 18 annular packing, 20 first notch portion, 21, 21' coupling member, 21
a sealing area, 21b, 21b 'collar, 21c, 21d tooth row, 21e
Female thread, 22 recessed portion, 23 O-ring as sealing member, 25 plastic molded body, 28 second cutout portion, 29 through hole

─────────────────────────────────────────────────── ─── Continued front page    (81) Designated countries EP (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, I T, LU, MC, NL, PT, SE, TR), JP, U S (72) Inventor Archim Richards             Federal Republic of Germany Roll Sternga             Set 9 F-term (reference) 5E048 AB01 CB02 [Continued summary] It is provided in.

Claims (13)

[Claims] 1. An electromagnetic coil device for operating a valve, comprising: a winding frame equipped with a winding; a metal casing surrounding the winding frame equipped with the winding; and a plurality of contact pieces including protective conductor connection terminals. And a cutout of the metal casing and the contact piece used as the protective conductor connection terminal, the cutout portion of the metal casing being arranged between the metal casing and the contact piece used as the protective conductor connection terminal. A metal coupling member that engages into the notch, and a ring-shaped sealing member that surrounds the coupling member, and the free space between the winding frame equipped with the winding, the metal casing, and the insertion base. In a type in which a space is filled with plastic, a connecting member (21; 21) for a contact piece (15) used as a protective conductor connecting terminal is used.
′) Engaging area is located inside the plug-in base (14; 14 ′; 14 ″), and the sealing member (23) is the connecting member (21; 21 ′) and the plug-in base. Zodiac (14; 1
4 '; 14 ") and an electromagnetic coil device having a sealing effect. 2. A sealing member (23) comprises a coupling member (21) and an insertion base (14).
14 ″) with a radial sealing action therebetween. 3. The insert base (14; 14 ″) has a recess (22) on the side closer to the metal casing (13) adapted to the outer contour of the sealing member (23). The electromagnetic coil device according to claim 2. 4. The electromagnetic coil device according to claim 3, wherein the recessed portion (22) is deeper than the thickness of the sealing member (23). 5. A collar (21) between the part (21d) of the coupling member (21) engaging in the metal casing (13) and the part (21a) surrounded by the sealing member (23). 21b), The electromagnetic coil device according to any one of claims 1 to 4. 6. The electromagnetic coil device according to claim 5, wherein the outer diameter of the collar (21b) is larger than the diameter of the recessed portion (22). 7. A sealing member (23) comprises a coupling member (21 ') and an insertion base (1).
4 ') is arranged with an axial sealing action between them and said connecting member (21').
) Has a collar (21b ') for axially inserting the sealing member (23) and crimping it onto the base (14'), and the collar (21b ') laterally faces the sealing member (23). The electromagnetic coil device according to claim 1, which is surrounded by. 8. The coupling member (21; 21 ') is formed in a rotationally symmetrical shape,
The electromagnetic coil device according to any one of claims 1 to 7, wherein the sealing member (23) is an O-ring. 9. At least one side surface of the plug-in base (14) has an outer side (14c) of the plug-in base (14) and a side (1) close to the metal casing (13).
The electromagnetic coil device according to any one of claims 1 to 8, which has one protruding portion (14a, 14b) between it and 4d). 10. The side of the insertion base (14) close to the metal casing (13) (
14b) includes at least one recess (14e, 14) surrounding the coupling member (21).
f, 14g), The electromagnetic coil device according to any one of claims 1 to 9. 11. A contact piece (1) whose insert base (14 ″) is used as a protective conductor connection terminal, as well as a first notch (20) for accommodating a coupling member (21).
5) A second notch (2) for accommodating the engagement area of the coupling member (21).
8) The electromagnetic coil device according to any one of claims 1 to 10, further comprising: 12. The electromagnetic coil device according to claim 11, wherein the second notch (28) is arranged perpendicular to the first notch (20). 13. The contact piece (15) used as a protective conductor connection terminal extends only into the plug-in base (14; 14 ′). Electromagnetic coil device.