CN116153713A

CN116153713A - Dry reed switch

Info

Publication number: CN116153713A
Application number: CN202211724005.XA
Authority: CN
Inventors: 曹利超; 林佳宾; 董欣赏; 关鑫
Original assignee: Xiamen Hongfa Signal Electronics Co ltd
Current assignee: Xiamen Hongfa Signal Electronics Co ltd
Priority date: 2022-12-30
Filing date: 2022-12-30
Publication date: 2023-05-23

Abstract

The invention discloses a reed switch, which comprises a glass tube, wherein the glass tube comprises a circular tube-shaped glass tube body, sintering sections are arranged at two ends of the glass tube body, two reed pieces are arranged in the glass tube body, each reed piece comprises a contact part, the two reed pieces are mutually contacted or separated through the two contact parts, one end of each conductive lead-out pin is fixedly connected with each reed piece, the other ends of the two conductive lead-out pins penetrate out of the two sintering sections respectively, each conductive lead-out pin is fixedly connected with one sintering section into a whole through a middle combination part, at least one pit is arranged on the middle combination part of each conductive lead-out pin, and glass of the sintering section is embedded into the pit. Further, the middle joint part is a cylinder, two pits are arranged on the middle joint part, and the two pits are positioned at the middle position of the middle joint part and are uniformly distributed along the circumferential direction at intervals. The invention effectively improves the sealing reliability and the consistency of the electrical parameters of the reed switch.

Description

Dry reed switch

Technical Field

The invention relates to the technical field of dry reed switch manufacturing.

Background

The reed switch adopts the glass sintering sealing technology, so that the contact of the reed switch can be free from the influence of external environment and has excellent environmental tolerance. In engineering practical application, the reed switch mainly exists in two forms of a sensor and a relay, wherein the sensor is driven by magnetic steel (for short, magnetic driving), and the relay is driven by a coil (for short, electric driving). The common reed switch is shown in fig. 9, and comprises a tubular glass tube 10, two sintering sections 101 are arranged at two ends of the glass tube 10, two reed pieces 20 are installed in the glass tube 10, each reed piece 20 comprises a contact part 201, the two reed pieces 20 are contacted with each other or separated from each other through the two contact parts 201, each reed piece 20 is respectively fixedly connected with one end of a conductive lead-out pin 30, the other ends of the two conductive lead-out pins 30 respectively penetrate out of the two sintering sections 101, and the conductive lead-out pins 30 are generally formed by cylindrical conductive metal pieces. In the actual processing process of the reed switch, the connection between the conductive pin 30 and the sintering section 101 is formed freely through glass sintering, and the reed switch is fixed only by the connection of the binding force between the circumferential interfaces, so the following problems are also caused: 1. it is difficult to achieve mutual positioning of the two, which results in a strong randomness of the relative positions of the two contact portions 201 on the two reed pieces 20, affecting the consistency of the electrical parameters, and a low assembly accuracy. 2. When the two contact portions 201 are engaged or disengaged for rapid switching in the operation of the reed switch, the randomness of the positions of bending deformation of the reed is also larger, and finally, the consistency of the counterforce of the reed is poor due to the large dispersion difference of the force arm, so that the consistency of the electrical parameters is also directly affected. 3. When the two contact portions 201 are engaged with and disengaged from each other during operation of the reed switch, alternating stress is generated, or when the reed switch is assembled into other products, the conductive pins 30 often need to be subjected to mechanical stress due to secondary processing (such as cutting off, bending of the lead-out ends, welding with other parts, etc.), and stress (such as thermal stress caused by temperature) generated by environmental factors is also transmitted to the position where the conductive pins 30 are connected with the glass tube sintering section 101, so that the cylindrical conductive pins 30 are easily caused to rotate or shift, thereby affecting the sealing reliability, mechanical and electrical performance stability of the reed switch.

Disclosure of Invention

The invention aims to provide a reed switch, which effectively improves the sealing reliability and electrical parameter consistency of the reed switch.

In order to achieve the above purpose, the technical scheme of the invention is as follows: the utility model provides a reed switch, includes the glass pipe, and the glass pipe includes the glass pipe body of tubular, and glass pipe body both ends are equipped with the sintering section, are equipped with two reed pieces in the glass pipe body, and every reed piece includes the contact part, and two reed pieces are contacted each other or are broken away from each other through two contact parts, and every reed piece links firmly a conductive pin one end respectively, and two conductive pin other ends are worn out respectively from two the sintering section, every conductive pin link firmly with one the sintering section is integrative through middle joint part, every be equipped with a pit on the middle joint part of conductive pin at least, the glass embedding of sintering section is in the pit.

Further improved, two pits are arranged on the middle joint part, and each pit is provided with glass embedding of the sintering section.

Preferably, the middle joint part is a cylinder, and the two pits are positioned at the middle position of the middle joint part and are uniformly distributed at intervals along the circumferential direction. Thus, the symmetrical distribution of external acting force is ensured during the processing of the conductive lead-out pins, so that the symmetrical deformation of the tongue reed is realized, and the internal stress generated by the asymmetrical deformation of the material is avoided; the sealing surface of the sintered conductive lead-out pin and the glass sintering section is expanded and matched in the circumferential direction; and finally, the influence of the stress generated by the structure and the processing on the stability and the sealing reliability of the reed switch parameter is weakened.

Preferably, the cross section of the pit is arc-shaped. This facilitates both processing and embedding of the sintered glass segment.

Further improved, the middle joint part of each conductive lead-out pin is a cylinder, and the joint part of the edge of the opening part of the pit and the outer surface of the middle joint part is transited through an arc section. The shearing force applied by the molten glass in the flowing process can be reduced, and the full filling of the pits can be realized; and the generation of fine cracks in the glass due to sharp corners after sintering can also be avoided, so that the crack expansion failure of the product due to external stress in the application process can be avoided, and the yield is improved.

A flattening section is arranged at the position, close to the sintering section, of each conductive lead-out pin outside the glass tube; the flattening section is beneficial to clamping and positioning during the processing of the conductive lead-out pins. And secondly, compared with the conductive leading-out script body, the flattening section has better flexibility, and the external stress can be weakened to a certain extent to be conducted to the sintering section so as to influence the sealing reliability.

The flattening section is parallel or perpendicular to the contact direction of the contact part. This facilitates determining the contact direction of the two contact portions, better for use in dry reed switch derivatives.

Further improved, each reed piece further comprises a flexible connecting part, wherein the flexible connecting part is a strip-shaped plate-shaped body, one end of the flexible connecting part is fixedly connected with the contact part, and the other end of the flexible connecting part is fixedly connected with one end of the conductive lead-out pin in the glass tube body; the two sides of one side of the flexible connecting part, which is close to the conductive leading-out pin, are provided with notches, and the notches on the two sides are mutually symmetrical in the width direction of the flexible connecting part; the flexible connecting part is bent along the section, and the bending direction is opposite to the contact movement direction of the reed contact part. Therefore, the function like a hinge is formed at the bending part, the bending deformation position of the reed can be well restrained when the two contact parts are rapidly switched to be engaged and disengaged, and the rotating pivot point when the reed acts is mainly concentrated at the bending position of the flexible connecting part, so that the problem that the size consistency of a reed moment arm (the moment arm is the distance from the reed contact head to the rotating pivot point) is poor due to free forming of glass sintering is effectively solved, the consistency of the counterforce of the reed is improved, the contact precision of the two contact parts is improved, and finally the consistency of the electrical parameters of the reed switch is improved; secondly, the flexible connecting part is close to the flexible of the bending part that is provided with the notch correspondingly on the two sides of the conductive leading-out pin, so that the flexibility of the flexible connecting part is improved, the alternating stress generated by the rapid switching of the two contact parts is reduced to be directly transmitted to the joint of the conductive leading-out pin and the glass sintering section, and the tightness of the glass tube can be further protected. In addition, two symmetrical notches can be used for guiding and positioning when the reed is bent, so that the consistency of the positions of bending lines is ensured, and the problem of insufficient precision caused by incapability of adopting a process hole for positioning when the cylindrical conductive pin body is punched is solved.

Preferably, the conductive lead-out pin, the flexible connection part of the tongue reed and the contact part are integrally formed by stamping. So as to facilitate processing and reduce manufacturing cost.

Preferably, the upper end surface and the lower end surface of the flexible connection part are parallel to the contact surface of the contact part, and the thickness of the contact part is greater than or equal to the thickness of the flexible connection part.

Preferably, the cross section of the notch is in the shape of an isosceles trapezoid with large outside and small inside, and four corners of the isosceles trapezoid are all transited by circular arcs. Therefore, the problem that the stability of the switch parameters of the reed is affected due to easy deformation caused by stress concentration is also avoided.

According to the invention, as the concave pit is arranged on the middle joint part of each conductive lead-out pin fixedly connected with the reed, and the glass of the sintering section is embedded into the concave pit, the middle joint part of the conductive lead-out pin and the sintering section form a positioning pin-like effect. On the one hand, the pits on the conductive pins are filled with glass after sintering, so that the sealing area of the conductive pins of the reed sheet and the glass can be increased, the connection reliability of the middle joint part of the conductive pins and the sintering section of the glass tube is enhanced, the effective area of the gas isolation path between the inside and the outside of the glass tube is increased, and the sealing reliability of the reed switch is further enhanced. On the other hand, through the combination of glass and pit for the intermediate junction of electrically conductive pin and sintering section is mutual from the location, is favorable to guaranteeing the depth of parallelism and the contact clearance uniformity of two reed piece contact parts, can ensure the relative position of two contact parts on two reed pieces, promotes the positional accuracy that two contact parts contacted, promotes reed switch electrical parameter uniformity. Meanwhile, the rotation or displacement of the reed caused by environmental stress (mainly caused by temperature or temperature change) or mechanical stress effect of the reed can be effectively improved, the parallelism of the contact parts of the two reed leaves and the consistency of the contact gaps are further ensured, and the mechanical and electrical performance stability of the reed switch is improved.

Drawings

FIG. 1 is a schematic cross-sectional view of the present invention;

FIG. 2 is an enlarged view at A of FIG. 1;

FIG. 3 is a sectional view B-B of FIG. 1;

FIG. 4 is a perspective view of the tongue piece of the present invention integrally connected to a conductive lead-out pin;

FIG. 5 is a top view of the tongue piece of the present invention integrally connected to the conductive lead-out leg;

FIG. 6 is a cross-sectional view of C-C of FIG. 5;

FIG. 7 is a schematic illustration of the effect of forming a hinge at the bend of the flexible connection unit;

FIG. 8 is a schematic view of two notches of the flexible connection unit respectively cooperating with two guide positioning blocks;

fig. 9 is a structural cross-sectional view of a conventional reed switch.

Detailed Description

The invention will be described in further detail with reference to the drawings and the detailed description.

The reed switch is shown in fig. 1 to 8, and comprises a glass tube 1, wherein the glass tube 1 comprises a tubular glass tube body 11, sintering sections 12 are arranged at two ends of the glass tube body 11, two reed pieces 2 are arranged in the glass tube body 11, each reed piece 2 comprises a contact part 21 and a flexible connecting part 22, the two reed pieces 2 are contacted with each other or separated from each other through the two contact parts 21, each reed piece 2 is fixedly connected with one end of one conductive lead-out pin 3 respectively, the other ends of the two conductive lead-out pins 3 penetrate out of the two sintering sections 12 respectively, and the upper end surface and the lower end surface of the flexible connecting part 22 are parallel to contact surfaces of the contact parts 21; each conductive lead-out pin 3 is fixedly connected with one sintering section 12 into a whole through a middle connecting part 3a, two pits 31 are arranged on the middle connecting part 3a of each conductive lead-out pin 3, the middle connecting part 3a is a cylinder, the two pits 31 are positioned at the middle position of the middle connecting part and are uniformly distributed at intervals along the circumferential direction, and each pit 31 is provided with glass embedding of the sintering section 12.

Thus, the two pits 31 are uniformly distributed and symmetrically distributed in the middle joint part 3a along the axial direction and the circumferential direction, which is beneficial to ensuring the symmetrical distribution of external acting force during the processing of the conductive lead-out pins 3, thereby realizing the symmetrical deformation of the tongue reed 2 and avoiding the internal stress generated by the asymmetrical deformation of materials; the sealing surface of the conductive lead-out feet 3 and the glass sintering section 12 after sintering is expanded and matched in the circumferential direction; and finally, the influence of the stress generated by the structure and the processing on the stability and the sealing reliability of the reed switch parameter is weakened.

The cross section of the pit 31 is arc-shaped. Further the inner surface of the recess 31 is substantially hemispherical. So as to facilitate processing and embedding of the sintered segment glass.

The middle joint part 3a of each conductive lead-out pin 3 is a cylinder, and the joint part between the edge of the opening part of each pit 31 and the outer surface of the middle joint part 3a is transited through an arc section. Firstly, the shearing resistance of molten glass in flowing can be reduced, and the problem of uneven local filling is avoided; secondly, stress concentration is not easy to occur at the arc position, and the risk of crack expansion failure of glass caused by stress concentration at the sharp angle can be avoided.

A flattening section 32 is arranged at the position of each conductive lead-out pin 3 positioned outside the glass tube 1 and close to the sintering section 12. The flattening section 32 can reduce the transmission of external stress of the glass tube 1 to the sintering section 12, so as to avoid the damage and the failure of the sealing performance of the glass tube 1; furthermore, the flattened section 32 can also serve as a clamping orientation.

The flattening section 32 may be parallel to the contact direction of the contact portion 21 or perpendicular to the contact direction. This facilitates determining the contact direction of the two contact portions 21, which is advantageous for better application to derivatives of reed switches. Preferably, the thickness of the contact portion 21 is greater than the thickness of the flexible connection portion 22; the thickness of the contact portion 21 may be equal to the thickness of the flexible connection portion 22.

Each flexible connecting part 22 is a strip-shaped plate body, one end of each flexible connecting part 22 is fixedly connected with the corresponding contact part 21, and the other end is fixedly connected with one end of the conductive lead-out pin 3 in the glass tube body 11; the two sides of the flexible connecting part 22, which are close to one side of the conductive leading-out pin 3 and are provided with a section 2a, are provided with notches 21, and the notches 21 at the two sides are mutually symmetrical in the width direction of the flexible connecting part 22; as shown in fig. 5, the notches 21 on both sides are symmetrical to each other with respect to the longitudinal section of the line a; the flexible connection part 22 is bent along the section 2a, and the bending position is the middle position of the section 2a, namely the b-line position in fig. 5, and the bending direction is opposite to the contact movement direction of the contact part 21 of the tongue reed 2. The cross section of the notch 23 is in the shape of an isosceles trapezoid with large outside and small inside, and four corners of the isosceles trapezoid are all transited by circular arcs. The conductive pin 3, the flexible connection portion 22 and the contact portion 21 of the reed 2 are integrally formed by stamping a metal member, which may be preferably an iron-nickel alloy member.

As can be seen by further combining fig. 1, 5 and 7, the position of the flexible connection part 22 close to the notch 23 has greater flexibility than other positions of the flexible connection part 22, and the bending position (the b line position in fig. 7) of the flexible connection part 22 can have a hinge-like effect; so that the side of the flexible connection part 22 close to the sintering section 12 ensures enough rigidity and bears the supporting function; while the flexible connection 22 ensures proper compliance on the other side away from the sintering section 12 to match well with the electromagnetic attraction force to ensure reliable operation of the tongue 2.

Secondly, the two notches 23 are symmetrically arranged, so that the symmetrical distribution of external acting force during reed processing is guaranteed, the symmetrical deformation of the reed is realized, and the internal stress generated by asymmetrical deformation of materials is avoided.

In addition, the cross section of the notch 23 is in the shape of an isosceles trapezoid with large outside and small inside, and four corners of the isosceles trapezoid are all transited by circular arcs. Therefore, the problem that the stability of the switch parameters of the reed is affected due to easy deformation caused by stress concentration is also avoided.

In addition, the two notches 23 of the embodiment can also be used for guiding and positioning when the reed is bent, so that the consistency of the positions of bending lines is ensured, and the problem of insufficient precision caused by incapability of adopting a process hole for positioning when the cylindrical conductive pin 3 body is punched and processed is solved. As shown in fig. 8, two guide positioning blocks 4 can be respectively matched with two notches 23 of the flexible connection part 22, and then the two guide positioning blocks are bent along the line b.

When the embodiment cooperates with the coil, the coil generates electromagnetic force to drive the two contact parts 21 to move in opposite directions to contact, the two conductive lead-out pins 3 are electrically conducted with each other, after the electromagnetic force is removed, the two contact parts 21 are separated from each other to return under the action of the self elasticity of the reed, and the two conductive lead-out pins 3 are disconnected with each other.

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 details 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, includes the glass pipe, and the glass pipe includes the glass pipe body of tubular, and glass pipe body both ends are equipped with the sintering section, are equipped with two reed pieces in the glass pipe body, and every reed piece includes the contact part, and two reed pieces are through two contact parts mutual contact or break away from each other, and every reed piece links firmly a conductive pin one end respectively, and two conductive pin other ends are worn out from two respectively the sintering section, its characterized in that: each conductive lead-out pin is fixedly connected with one sintering section into a whole through a middle combination part, at least one pit is arranged on the middle combination part of each conductive lead-out pin, and glass of the sintering section is embedded into the pit.

2. A reed switch as in claim 1, wherein: two pits are arranged on the middle joint part, and each pit is provided with glass embedding of the sintering section.

3. A reed switch as in claim 2, wherein: the middle joint part is a cylinder, and the two pits are positioned at the middle position of the middle joint part and are uniformly distributed at intervals along the circumferential direction.

4. A reed switch as in claim 1, wherein: the cross section of the pit is arc-shaped.

5. A reed switch as in claim 1, wherein: the middle joint part of each conductive lead-out pin is a cylinder, and the joint part of the edge of the opening part of the pit and the outer surface of the middle joint part is transited through an arc section.

6. A reed switch as in claim 1, wherein: a flattening section is arranged at the position, close to the sintering section, of each conductive lead-out pin outside the glass tube; the flattening section is parallel or perpendicular to the contact direction of the contact part.

7. A reed switch as claimed in any one of claims 1 to 6, wherein: each reed piece further comprises a flexible connecting part, wherein the flexible connecting part is a strip-shaped plate-shaped body, one end of the flexible connecting part is fixedly connected with the contact part, and the other end of the flexible connecting part is fixedly connected with one end of a conductive lead-out pin in the glass tube body; the two sides of one side of the flexible connecting part, which is close to the conductive leading-out pin, are provided with notches, and the notches on the two sides are mutually symmetrical in the width direction of the flexible connecting part; the flexible connecting part is bent along the section, and the bending direction is opposite to the contact movement direction of the reed contact part.

8. A reed switch as in claim 7, wherein: the conductive lead-out pin, the flexible connecting part of the tongue reed and the contact part are integrally formed by stamping.

9. A reed switch as in claim 7, wherein: the upper end face and the lower end face of the flexible connecting part are parallel to the contact surface of the contact part, and the thickness of the contact part is larger than or equal to that of the flexible connecting part.

10. A reed switch as in claim 7, wherein: the cross section of the notch is in the shape of an isosceles trapezoid with large outside and small inside, and four corners of the isosceles trapezoid are all transited by circular arcs.