JP2005203290A - Small-sized relay - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a small-sized relay in which invasion of water, trash, dust or the like from an air hole or a gap existing at a case or a base of the small-sized relay is prevented, and only air circulation is made possible. <P>SOLUTION: An optional place of the base 2 or the case 11 of the small-sized relay 1 is opened, a waterproof sheet 18 composed of polytetrafluoroethylene resin or the like is adhered to the opening part 13, and the small-sized relay which can do only ventilation into the inside of the relay by the waterproof sheet 18 is provided. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a small relay, and more particularly to a small relay formed so that air permeability into the relay is sufficiently maintained and water, dust, dust, or the like can be prevented from entering. It is.

  Conventionally, there are two types of this type of small relay, an open type and a sealed type. There are quite a large number of patent documents and the like regarding open type and sealed type small relays.

That is, in both the open type and the sealed type, the internal mechanism is such that a coil is wound around a bobbin having a core inserted in the center, and a yoke is disposed on the side surface of the coil. An armature bent in an L-shape is rotatably supported at one end, and when the coil is energized, the armature is attracted to the core and rotated, and the movable contact piece is pressed via a card, The movable contact of the movable contact is in contact with the fixed contact of the fixed contact, or the relay is formed so that the movable contact is turned off from the fixed contact when the coil is energized to be separated from the fixed contact. For example, as disclosed in Patent Document 1, the internal mechanism is disposed on a base formed of a synthetic resin, and a case is mounted on the upper surface of the internal mechanism. The lower end portion was placed on the upper surface of the peripheral edge of the base, and a small protrusion provided on the base was fitted into a small hole opened in the case to prevent the case from coming off.
JP 2000-195405 (FIG. 1)

  As described above, the conventional small relay has an open type and a sealed type. The open type has an air hole for circulating air in the case or the base, or a fitting portion between the case and the base. However, there are problems such as infiltration from air holes or gaps, and intrusion of dust, dust, and the like.

  On the other hand, the sealed type can prevent intrusion of water, dust, dust, etc., but air flow to the inside of the relay is interrupted, which causes problems such as the contact welding and the switching life of the relay being reduced. It was.

  Then, while preventing intrusion of water, dust, dust and the like, there arises a technical problem to be solved in order to enable air circulation, and the present invention aims to solve the problem. .

  The present invention has been proposed in order to achieve the above object, and the invention according to claim 1 opens any part of the base or case of the small relay, and the opening is made of tetrafluoroethylene resin or the like. It is an object of the present invention to provide a small relay in which a waterproof sheet is bonded and the waterproof sheet allows only ventilation into the relay.

  According to a second aspect of the present invention, there is provided a small relay in which the waterproof sheet is welded to a peripheral portion of an opening provided in the base or the case by means of heat welding.

  Furthermore, in the invention described in claim 3, the opening provided in the base or case has a small hole in the center, an air reservoir recess is provided in the periphery of the small hole, and the air reservoir is further provided. A peripheral part of the concave part is raised, an annular concave part is provided on the outer side part of the convex part, and the sheet is welded to the annular concave part and the upper surface of the raised part by means of heat welding, and on the peripheral part of the sheet The present invention provides a small relay that is bonded with an adhesive.

  According to the first aspect of the present invention, an arbitrary portion of the base or case of the small relay is opened, and a waterproof sheet made of ethylene tetrafluoride resin or the like is enclosed in the opening, and the inside of the relay is formed by the waterproof sheet. Since only ventilation is possible, water, dust, dust, etc. do not enter the relay, and only ventilation is possible. Therefore, the relay is not contaminated and the contacts are welded together. It will no longer reduce the life of the relay.

  In the invention described in claim 2, since the waterproof sheet is welded to the periphery of the opening by means of heat welding, in addition to the effect of the invention described in claim 1, the waterproof sheet can be easily, quickly and reliably. The periphery of the sheet can be firmly adhered to the periphery of the opening, and there is no possibility of accidental peeling.

  Further, in the invention according to claim 3, an air reservoir recess is provided in the peripheral portion of the small hole at the center of the opening, the peripheral portion of the air reservoir recess is raised, and an annular recess is further formed on the outer side of the protrusion. 3. The invention according to claim 1, wherein the waterproof sheet is thermally welded to the upper surface of the annular recess and the raised portion, and further, an adhesive is deposited on the periphery of the waterproof sheet. In addition to the above effects, the reliability of air circulation is ensured, and the waterproof sheet is securely bonded to the periphery of the opening, thereby further aiding invasion prevention effects such as water, dust, and dust.

  The present invention provides a function for preventing water from entering a small relay and preventing intrusion of dust, dust, etc., with a case or base provided with an opening, and the opening is waterproof with only air permeability allowed. Realized by mounting the seat.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 1 is a plan view of a small relay 1 according to the present invention, FIG. 2 is a side view showing an internal mechanism, FIG. 3 is a bottom view of FIG. 1, and FIG. 4 is an enlarged longitudinal sectional view of a circle portion of FIG. It is. In FIG. 2, the small relay 1 is provided with a bobbin 4 having a core 3 inserted into a central part thereof on one side of a base 2 formed of synthetic resin or the like. 5, a yoke 6 is disposed on the side surface of the coil 5, and an armature formed by bending the yoke 6 into an L shape is rotatably supported at the lower end of the yoke 6.

  Further, a card 8 is attached to the distal end portion of the armature 7, and the distal end portion of the card 8 is locked to an upper portion of the movable contact piece 9 erected on the base 2, and further, the movable contact piece. 9, a fixed contact piece 10 having a fixed contact 10a with a predetermined interval is erected, and a relay circuit as described in the conventional example is formed.

  Further, the terminal 5a of the coil 5, the terminal 9a of the movable contact piece 9, and the terminal 10a of the fixed contact piece 10 are respectively connected to the base 2 through insertion holes (not shown) of the respective terminals provided in the base 2. Projected outward. Accordingly, an arbitrary gap to the inside and outside of the small relay 1 is formed between the terminals 5a, 9a, 10a and the base 2 by the insertion hole, and water, dust, dust and the like invade in this state. Therefore, in the embodiment of the present invention, as will be described later, all the gaps are sealed to prevent any intrusion of water, dust, dust and the like.

  Thus, although the mechanism is covered by the case 11, the case 11 is formed of a cylindrical body having an open bottom surface, and is substantially the same shape as the base 2 in plan view, and the height is the base. 2 is formed slightly higher than the upper surface of the mechanism. Thus, the lower end surface of the lower surface opening portion of the case 11 is fitted to the outer peripheral side surface of the base 11, and as shown in FIG. An adhesive 12 is applied and sealed to a joint portion with the base 2 and the like. Accordingly, the seal completely blocks the ventilation between the inside and outside of the case and the penetration of water, dust and dust into the case.

  Thus, according to the present invention, the opening 13 is provided in the case 11 of the small relay 1 sealed as described above. The opening 13 may be provided in the base 2. Thus, as shown in FIGS. 1 and 4, the opening 13 is opened on one side of the upper surface of the case 11, and a small hole 14 for ventilation is opened in the central portion. An air reservoir recess 15 formed in an inverted trapezoidal shape centering on the hole 14 is provided, and a substantially square-shaped raised portion 16 is provided so as to surround the outside of the air reservoir recess 15, and further, on the outside of the raised portion 16. A substantially square annular recess 17 is provided.

  Thus, the vent hole 14 is formed in a reverse truncated cone shape so that air can be smoothly introduced from the outside. Further, when air flows into the case 11 from the vent hole 14, the air from the outside can be stored in the temporary air reservoir recess 15, and thus from the vent hole 14. Air inflow into the case 11 can be subsidized.

  Therefore, in the present invention, as shown in the sectional view of FIG. 4, a waterproof sheet 18 made of ethylene tetrafluoride resin or the like is formed in an area reaching the vicinity of the peripheral edge of the annular recess 17, and the The waterproof sheet 18 is stretched so as to be in contact with the raised portion 16 and the annular concave portion 17 with the ventilation small hole 14 as a center, and is bonded with an adhesive 19. Further, the adhesive 19 is also deposited between the upper surface of the outer peripheral edge of the waterproof sheet 18 and the peripheral side surface of the annular recess 17 to strengthen the adhesion of the waterproof sheet 18.

  Further, instead of bonding the waterproof sheet 18 by the adhesive 19, the waterproof sheet 18 can be welded by means of heat welding. In that case, the welding operation can be performed more easily, quickly and accurately.

  Thus, since the waterproof sheet 18 is made of tetrafluoroethylene resin or the like as described above, ventilation into the relay is allowed but water, dust, dust and the like are not allowed to enter. Therefore, in the present invention, air can be circulated into the small relay 1 only from the opening 13, but intrusion of water, dust, dust or the like is completely blocked. Therefore, the movable contact 9b and the fixed contact 10b of the small relay 1 are not welded to reduce the open / close life of the relay, and contamination of the small relay 1 due to intrusion of water, dust, and dust, etc. Various harmful effects can be prevented in advance.

  It should be noted that the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

The top view of the small relay which shows one embodiment of this invention. The side view which shows the inside of the small relay of FIG. The bottom view of FIG. FIG. 3 is an enlarged longitudinal sectional view in a circle of FIG. 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Small relay 2 Base 3 Core 4 Bobbin 5 Coil 5a Coil terminal 6 Yoke 7 Amateur 8 Card 9 Movable contact piece 9a Movable contact piece 9b Movable contact 10 Fixed contact piece 10a Fixed contact piece terminal 10b Fixed contact 11 Case 12 Adhesive 13 Opening 14 Small hole for ventilation 15 Air retaining recess 16 Raised portion 17 Annular recess 18 Waterproof sheet 19 Adhesive

Claims (3)

  Opening any part of the base or case of a small relay, attaching a waterproof sheet made of tetrafluoroethylene resin or the like to the opening, and allowing only ventilation to the inside of the relay with the waterproof sheet A small relay.   2. The small relay according to claim 1, wherein the waterproof sheet is welded to a peripheral portion of an opening provided in the base or the case by means of heat welding.   The opening provided in the base or the case has a small hole in the center, an air reservoir recess is provided in the peripheral part of the small hole, and the peripheral part of the air reservoir recess is further raised, An annular recess is provided on the outer side of the part, and the sheet is welded to the annular recess and the upper surface of the raised part by means of heat welding, and an adhesive is applied to the peripheral part of the sheet and adhered. The small relay according to claim 1, wherein the relay is a small relay.

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