CN115565820A

CN115565820A - Connecting structure of dry reed switch and coil framework

Info

Publication number: CN115565820A
Application number: CN202211197883.0A
Authority: CN
Inventors: 曹利超; 林佳宾; 董欣赏; 聂福大; 毛启明
Original assignee: Xiamen Hongfa Signal Electronics Co ltd
Current assignee: Xiamen Hongfa Signal Electronics Co ltd
Priority date: 2022-09-29
Filing date: 2022-09-29
Publication date: 2023-01-03

Abstract

The invention discloses a connecting structure of a reed switch and a coil framework, wherein the reed switch comprises a glass tube, the glass tube comprises a round tube-shaped glass tube body, sintering sections are arranged at two ends of the glass tube body, two reed pieces which can be mutually contacted or separated are arranged in the glass tube body, leading-out pins of the two reed pieces respectively penetrate out of the two sintering sections along the central axis of the glass tube body, the coil framework is formed by coating the whole glass tube through injection molding, the coil framework comprises a middle round tube-shaped winding part and two heads connected with two ends of the winding part, and the leading-out pins of the two reed pieces respectively penetrate out of the middle positions of the end surfaces of the two heads; each sintering section is partially or completely positioned in one head, one section of each reed leading-out pin is clamped by one head, and each head is provided with a heat dissipation structure close to the sintering section. The invention can improve the anti-interference and anti-cracking capability of the glass tube, ensure the initial tightness of the glass tube, has good insulation property and is beneficial to automatic production.

Description

Connecting structure of dry reed switch and coil framework

Technical Field

The invention relates to the technical field of manufacturing of dry-reed relays, in particular to a connecting structure of a dry-reed switch and a coil framework.

Background

The reed relay is a derivative based on the reed switch technology, and the reed part of the reed relay can be prevented from being polluted and corroded by the external atmospheric environment due to the fact that the reed switch adopts a special packaging structure (glass tube is hermetically sintered) and a special process (inert gas is filled in the glass tube or vacuum treatment is conducted), so that the reed relay has incomparable high contact reliability and excellent insulating performance. In the field where high insulation and high contact reliability are sought (represented by instrument testing, network communication, new energy insulation detection, and medical electronics), reed relays have been widely recognized and applied.

The conventional dry-reed relay generally comprises a dry-reed switch, a coil framework, a coil and a shell, wherein the coil framework is manufactured firstly in the connection mode of the dry-reed switch and the coil framework, and then a dry-reed switch glass tube is arranged in a central hole of the coil framework and then is fixed by glue filling. Firstly, the connection structure is easy to damage the reed switch glass tube, influences the initial tightness of the reed switch glass tube and is not beneficial to realizing automatic production. Secondly, because the connection mode adopts glue filling and packaging, low molecular weight substances are easy to separate out, so that the insulation performance after connection is deteriorated, and the defects that a cavity is easy to form in the glue, the glue surface is easy to bulge and the like affect the connection quality of the reed switch and the coil framework and the insulation performance after connection. Thirdly, the connection structure is difficult to center the glass tube of the dry reed switch in the central hole of the coil framework, the center of the contact part of the reed spring of the dry reed switch (the position with the largest air gap) is difficult to coincide with the center of the window of the coil framework (the position with the most intensive coil magnetic flux), and the electrical performance cannot be further improved.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a connecting structure of a reed switch and a coil framework, which can improve the anti-interference and rupture capacity of a reed switch glass tube, ensure the initial tightness of the reed switch glass tube, has good insulating property and is beneficial to automatic production.

In order to achieve the purpose, the technical scheme of the invention is as follows: a reed switch and connection structure of the coil skeleton, the reed switch includes the glass tube, the glass tube includes the tubular glass tube body of round, there are sintering sections at both ends of the glass tube body, the glass tube body is equipped with two reed that can contact each other or break away from each other, two reed draws forth the foot and penetrates out from two said sintering sections along the body central axis of glass tube separately, the coil skeleton is formed by wrapping the whole said glass tube of injection molding, the coil skeleton includes the middle tubular winding part and connects two heads at both ends of the winding part, one end of two reed draws forth the foot and penetrates out from two said head end surfaces middle position separately; each sintering section is partially or completely positioned in one head, one section of each reed leading-out pin is clamped by one head, and each head is provided with a heat dissipation structure close to the sintering section.

Further, the central axis of the circular tube-shaped winding part is overlapped with the central axis of the glass tube body; the heat dissipation structure comprises a plurality of heat dissipation grooves formed in the end face of the head, the heat dissipation grooves are distributed around a cylindrical surface, and the central axis of the cylindrical surface is overlapped with the central axis of the glass tube body.

And furthermore, one end of each heat dissipation groove is communicated with the side surface of the head, and the other end of each heat dissipation groove is positioned on the cylindrical surface.

Furthermore, a coil leading-out pin penetrates through the upper part of each head, and one end of each of the two coil leading-out pins is respectively and electrically connected with the two ends of the coil enameled wire in a winding manner.

And furthermore, positioning grooves are formed in the same sides of the two heads, and the bent part of the other end of each coil pin is positioned in the positioning grooves. The positioning groove is beneficial to positioning and protecting the coil leading-out pin in subsequent processing.

Furthermore, a wire passing groove is formed in one end, close to the coil leading-out pin, of each head part; and at least one head is provided with a winding clamping groove. The outgoing line can be prevented from moving on the head of the coil framework and breaking through the line passing groove, and meanwhile the line passing groove can play a role in protecting the outgoing line. The winding positioning on the coil framework is convenient through the winding clamping groove.

Preferably, each of the heads has a convex shape in a cross section perpendicular to the central axis of the glass tube body.

Further improving, each reed lead-out pin penetrating out of the head is cylindrical, a flattening part is processed in the middle of each reed lead-out pin penetrating out of the head, and the flattening part is parallel to or vertical to the contact surface of the reed contact; and positioning and injection molding the coil framework by utilizing the flattening part. Through set up at reed and beat flat portion of pin mid portion, can be so that more firm when being connected with the casing on the one hand, on the other hand can more conveniently discern the direction of reed contact surface, is convenient for set up reed contact surface working direction, promotes action reliability and jam-proof performance. In addition, the coil framework is formed by positioning and injection molding of the flattening part, so that the assembly or processing of the shell in the next process is facilitated.

In a further improvement, the glass tube is centrally distributed in the coil bobbin along the radial direction and the axial direction of the glass tube. Thus, the center (the position with the largest air gap) of the contact part of the reed piece of the reed switch is beneficial to realizing the coincidence with the center (the position with the most intensive coil magnetic flux) of the window of the coil framework; the coil magnetic flux can be fully utilized, the consistency of electrical parameters can be improved, and the electrical performance is further improved.

Further, when the outer portion of the glass tube is coated in an injection molding mode, the glue injection port is arranged in the middle of the end face of one head, and glue materials flow along the axial direction and the radial direction of the glass tube during glue injection. The single lateral glue inlet mode is adopted, so that the injection molding pressure can be reduced, and the scouring acting force of plastics on the glass tube is reduced; meanwhile, the plastic at the position of the sintering section flows approximately along the radial direction, so that the expansion matching of the plastic and the glass is ensured to the maximum extent (the expansion coefficient of the plastic in the flowing direction is smaller than that in the vertical flowing direction and is closer to that of the glass), and the plastic in the sintering sections at the two ends flows in the same direction, so that the glass tube of the reed switch is better protected. The yield of the injection molding coil skeleton is improved.

The invention has the following beneficial effects:

1. according to the connecting structure, the dry spring switch glass tube is coated by the solid plastic filling, and is integrally and rigidly connected with the plastic, so that the disturbance of the glass tube caused by external vibration is avoided, the risk that the sealing property is invalid due to the fact that the cracking of the glass tube or the bonding interface of a sintering section is damaged caused by the disturbance is avoided, and the initial sealing property of the dry spring switch glass tube is ensured. The method is better suitable for application occasions with higher requirements on vibration resistance.

2. The reed leading-out pin of the dry reed switch is provided with a section of part which is clamped by the head part of the coil framework, and each sintering section is partially or completely positioned in the head part of one coil framework, so that the phenomenon that the deformation stress is directly transmitted to the root part of the glass tube sintering section to cause sealing failure due to the fact that the reed leading-out pin clamping position is too close to the glass tube sintering section when the coil framework is subjected to injection molding can be prevented; and the plastic coated section can be ensured to have certain strength, the damage of the glass tube sintering section caused by the transmission of mechanical stress to the root of the glass tube sintering section during the secondary processing of the reed leading-out pin after the coil framework is subjected to injection molding is avoided, and the structural strength after the integral connection is improved.

3. Through every the head is being close to sintering department is provided with heat radiation structure, has reduced plastics, glass, the influence that metal three can not expand in step, reaches to avoid the uneven extrusion that causes of thermal stress to influence the purpose of glass pipe leakproofness. Meanwhile, the heat dissipation structure can increase the creepage distance of the connection structure, and simultaneously has the effect of reducing the weight and reducing the influence of the deflection generated on the coil framework due to the centrifugal action under high-speed rotation when the coil is wound on the coil framework so as to damage the sealing property of the glass tube.

4. This connection structure need not to adopt the encapsulating encapsulation, can not isolate low molecular weight material and the insulating nature after the degradation connection has promoted the insulating properties after the connection.

5. The coil framework is formed by coating the whole glass tube through injection molding, and automatic production is favorably realized.

In addition, when the glass tube is distributed in the coil framework in the middle, the consistency and the electrical performance of the electrical parameters of the glass tube are further improved.

Drawings

FIG. 1 is a perspective view of a reed switch;

FIG. 2 is a perspective view of a hidden portion of the glass tube of the reed switch of FIG. 1;

FIG. 3 is a perspective view of the present invention;

FIG. 4 is a top view of the present invention;

FIG. 5 isbase:Sub>A sectional view A-A of FIG. 4;

fig. 6 is a schematic diagram of the glue injection port and the flow direction of the glue during injection molding of the coil bobbin.

Detailed Description

The invention is described in further detail below with reference to the drawings and the detailed description.

As shown in fig. 1 to 5, a reed switch and coil skeleton connection structure, a reed switch 1 includes a glass tube 11, the glass tube 11 includes a round tube-shaped glass tube body 11a, sintered sections 11b are provided at two ends of the glass tube body 11a, two reeds 12 capable of contacting with each other or separating from each other are installed in the glass tube body 11a, two reeds leading-out pins 13 respectively penetrate out from the two sintered sections 11b along a central axis of the glass tube body 11a, and the glass tube 11 is filled with an inert gas or in a vacuum state; the connecting section 12a of the reed 12 and the reed leading-out pin 13 adopts an eccentric flattening structure, and the connecting section 12a of the reed 12 and the reed leading-out pin 13 can also adopt other structures as long as the two reeds 12 can be in contact with or separated from each other; the coil framework 2 is formed by coating the whole glass tube 11 through injection molding, the coil framework 2 comprises a middle circular tube-shaped winding part 21 and two heads 22 connected with two ends of the winding part 21, the length of the circular tube-shaped winding part 21 is slightly longer than that of the glass tube body 11a, and one ends of two reed leading-out pins 13 respectively penetrate out of the middle positions of the end surfaces of the two heads 22; each sintered segment 11b is partially disposed in one of the heads 22, each sintered segment 11b may be entirely disposed in one of the heads 22, a portion of each reed extension pin 13 is sandwiched by one of the heads 22, and each head 22 is provided with a heat dissipation structure 3 near the sintered segment 11 b.

The central axis of the circular tube shaped winding part 21 is overlapped with the central axis of the glass tube body 11 a; the heat dissipating structure 3 includes a plurality of heat dissipating grooves 31 formed on the end surface of the head 22, and the plurality of heat dissipating grooves 31 are distributed around a cylindrical surface 32, and the central axis of the cylindrical surface 32 overlaps the central axis of the glass tube body 11 a. One end of each heat dissipation groove 31 is communicated with the side surface of the head 22, and the other end is positioned on the cylindrical surface 32.

A coil leading-out pin 4 is arranged at the upper part of each head part 22 in a penetrating way, and one end 41 of each of the two coil leading-out pins 4 is respectively and electrically connected with the two ends of the coil enameled wire in a winding way.

The same side of the two heads 22 is provided with a positioning groove 221, and the bent part of the other end of each coil lead-out pin 4 is positioned in the positioning groove 221.

A wire passing groove 222 is formed at one end 41 of each head part 22 close to the coil leading-out pin 4; the wire-passing groove 222 may be configured in a U-shape, V-shape or other arc shape; the end part of the coil enameled wire is convenient to wind on one end 41 of the coil leading-out pin 4 through the wire passing groove 222; at least one head 22 is provided with a winding clamping groove 223; so as to clamp and position the coil bobbin 2 and then wind the coil to form the coil.

Each of the head portions 22 has a convex shape in a cross section perpendicular to the central axis of the glass tube body 11 a.

Each reed lead-out pin 13 penetrating out of the head 22 is cylindrical, a flattened part 131 is processed in the middle of each reed lead-out pin 13 penetrating out of the head 22, the flattened part 131 is parallel to the contact surface of the reed 12 contact, the flattened part 131 can be perpendicular to the contact surface of the reed 12 contact, and the direction of the contact surface of the reed 12 contact can be well recognized. Meanwhile, the coil frame 2 can be formed by positioning and injection molding the flattening part 131. The assembly or the processing of the shell in the subsequent procedure is convenient.

The glass tube 11 is centrally distributed in the bobbin 2 in the radial and axial directions thereof. The center (the position with the largest air gap) of the contact part of the reed 12 of the reed switch 1 is coincided with the center (the position with the most intensive coil magnetic flux) of the window of the coil framework 2; the coil magnetic flux can be fully utilized, the consistency of electrical parameters can be improved, and the electrical performance is further improved.

Referring to fig. 5 and 6, when the glass tube 11 is coated by injection molding to form the bobbin 2, the glue injection opening 2a is disposed at a middle position of an end surface of one head portion 22, and glue flows along an axial direction and a radial direction of the glass tube 11 during glue injection (as indicated by arrows in fig. 6). The single lateral glue inlet mode is adopted, so that the injection molding pressure can be reduced, and the scouring acting force of plastics on the glass tube 11 is reduced; meanwhile, the plastic at the position of the sintering section 11b flows approximately along the radial direction, so that the expansion matching between the plastic and the glass is ensured to the maximum extent (the expansion coefficient of the plastic in the flowing direction is smaller than that in the vertical flowing direction and is closer to that of the glass), and the plastic flowing directions of the sintering sections 11b at two ends are consistent, so that the glass tube 11 of the reed switch 1 is protected better.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The utility model provides a reed switch and coil skeleton's connection structure, reed switch include the glass pipe, and the glass pipe is including the tubulose glass pipe body of circle, and glass pipe body both ends are equipped with the sintering section, are equipped with two reed pieces that can contact each other or break away from each other in the glass pipe body, and two reed pieces are drawn forth the foot and are followed two respectively along glass pipe body the central axis the sintering section is worn out, its characterized in that: the coil framework is formed by coating the whole glass tube through injection molding, the coil framework comprises a middle circular tube-shaped winding part and two heads connected with two ends of the winding part, and one ends of two reed leading-out pins respectively penetrate out of the middle positions of the end surfaces of the two heads; each sintering section is partially or completely positioned in one head, one section of each reed leading-out pin is clamped by one head, and each head is provided with a heat dissipation structure close to the sintering section.

2. The structure of claim 1, wherein the coil bobbin is connected to the reed switch by a dry switch, and the reed switch comprises: the central axis of the circular tube-shaped winding part is overlapped with the central axis of the glass tube body; the heat dissipation structure comprises a plurality of heat dissipation grooves arranged on the end face of the head, the heat dissipation grooves are distributed around a cylindrical surface, and the central axis of the cylindrical surface is overlapped with the central axis of the glass tube body.

3. The structure of claim 2, wherein the coil bobbin is connected to the reed switch by a dry switch, and the reed switch comprises: one end of each heat dissipation groove is communicated with the side face of the head, and the other end of each heat dissipation groove is located on the cylindrical surface.

4. The structure of claim 1, wherein the coil bobbin is connected to the reed switch by a dry switch, and the reed switch comprises: and one end of each coil leading-out pin is respectively and electrically connected with the two ends of the coil enameled wire in a winding way.

5. The structure of claim 4, wherein the coil bobbin is connected to the reed switch by: the two heads are provided with positioning grooves at the same side, and the other end of each coil pin is bent and positioned in the positioning groove.

6. The structure of claim 4, wherein the coil bobbin is connected to the reed switch by: a wire passing groove is formed in one end, close to the coil leading-out pin, of each head part; at least one of the heads is provided with a winding clamping groove.

7. The structure of claim 1, wherein the coil bobbin is connected to the reed switch by a dry switch, and the reed switch comprises: each head part is in a convex shape along the cross section perpendicular to the central axis of the glass tube body.

8. The structure of claim 1, wherein the coil bobbin is connected to the reed switch by: each reed lead-out pin penetrating out of the head is cylindrical, a flattening part is processed in the middle of each reed lead-out pin penetrating out of the head, and the flattening part is parallel to or perpendicular to the contact surface of the reed contact; and positioning and injection molding are carried out by utilizing the flattening part to form the coil framework.

9. The structure of claim 1, wherein the coil bobbin is connected to the reed switch by: the glass tube is centrally distributed in the coil bobbin along the radial direction and the axial direction of the glass tube.

10. A reed switch and bobbin connecting structure according to any one of claims 1 to 9, wherein: when the outer portion of the glass tube is coated in an injection molding mode, the glue injection port is arranged in the middle of the end face of one head, and glue materials flow along the axial direction and the radial direction of the glass tube during glue injection.