WO2024067257A1

WO2024067257A1 - Reed relay

Info

Publication number: WO2024067257A1
Application number: PCT/CN2023/119790
Authority: WO
Inventors: 曹利超; 林佳宾; 董欣赏; 聂福大; 毛启明
Original assignee: 厦门宏发信号电子有限公司
Priority date: 2022-09-29
Filing date: 2023-09-19
Publication date: 2024-04-04

Abstract

A reed relay, comprising a reed switch (1) and a coil framework (2). The reed switch (1) comprises a glass tube (11). The glass tube (11) comprises a glass tube body (11a) and two sintered sections (11b), wherein the glass tube body (11a) is internally provided with two tongue reeds (12), and two tongue reed lead-out pins (13) respectively penetrate the two sintered sections (11b). The coil framework (2) is formed by means of injection molding and covers the whole glass tube (11), and comprises a tubular winding portion (21), and two head portions (22), which are connected to two ends of the winding portion (21), wherein the two tongue reed lead-out pins (13) respectively penetrate the two head portions (22) with one end thereof, and the sintered sections (11b) are partially or completely located in the head portions (22). One section of each tongue reed lead-out pin (13) is wrapped and fixed by the corresponding head portion (22), and each head portion (22) is provided with a coil heat dissipation structure (24) at the position close to the corresponding sintered section (11b). The reed relay has a relatively good initial sealing performance and insulating performance.

Description

Reed Relay

The present disclosure claims priority to Chinese patent applications with application numbers 202211197883.0, 202211197856.3, and 202211201243.2 filed on September 29, 2022, the entire contents of which are incorporated herein by reference in their entirety.

Technical Field

The present disclosure relates to the technical field of reed relay manufacturing, and in particular to a reed relay.

Background technique

Reed relays are derivatives of reed switch technology. Because reed switches use a special packaging structure (sealed sintered glass tube) and process (filling the glass tube with inert gas or vacuum treatment), the reed part can be free from pollution and corrosion from the external atmospheric environment, so it has unparalleled high contact reliability and excellent insulation performance. Reed relays have been widely recognized and applied in the fields that pursue high insulation and high contact reliability (represented by instrument testing, network communication, new energy insulation testing and medical electronics).

Existing reed relays usually include a reed switch, a coil frame, a coil and a housing. When manufacturing a reed relay, the coil frame is generally made first, and then the reed switch glass tube is installed in the center hole of the coil frame, and then glue is poured to fix it. First, this fixing method of the reed switch glass tube and the coil frame is easy to cause damage to the reed switch glass tube, affecting the initial sealing of the reed switch glass tube, and is not conducive to the realization of automated production. Secondly, due to the use of glue encapsulation, low molecular weight substances are easily separated and the insulation performance of the reed switch is deteriorated, and the inside of the glue is easy to form a cavity, and the outer surface of the glue is easy to bulge, etc., which affects the connection quality of the reed switch and the coil frame and the insulation performance after connection. Thirdly, the above-mentioned fixing method of the reed switch glass tube and the coil frame makes it difficult to center the reed switch glass tube in the center hole of the coil frame, and it is difficult to achieve the coincidence of the center of the reed contact part of the reed switch (the largest air gap) and the center of the coil frame window (the most dense magnetic flux of the coil), and it is impossible to further improve the electrical performance.

Summary of the invention

The technical problem to be solved by the present disclosure is to provide a reed relay which can ensure the initial sealing of the reed switch glass tube and has good insulation performance.

To achieve the above-mentioned purpose, the technical scheme disclosed in the present invention is: a reed relay, comprising a reed switch and a coil skeleton, the reed switch comprising a glass tube, the glass tube comprising a cylindrical glass tube body, sintered sections are respectively provided at both ends of the glass tube body, two reeds that can contact or separate from each other are installed in the glass tube body, and the reed lead pins of the two reeds respectively pass through the two sintered sections, characterized in that: the coil skeleton is formed by injection molding and covers the entire glass tube, the coil skeleton comprises a middle cylindrical winding part and two heads connected to the two ends of the winding part, one end of the two reed lead pins respectively passes through the middle position of the end faces of the two heads; each of the sintered sections is partially or completely in one of the heads, a section of each reed lead pin is covered and fixed by one of the heads, and each of the heads is provided with a There is a coil heat dissipation structure.

According to an embodiment of the present disclosure, the two reed lead pins respectively pass through the two sintering sections along the central axis of the glass tube body.

According to an embodiment of the present disclosure, the head of the coil frame coincides with the central axis of the winding portion. This is conducive to aligning the contact portion center (where the air gap is the largest) of the reed switch tongue with the coil frame window center (where the coil magnetic flux is the most dense), which can fully utilize the coil magnetic flux, improve the consistency of electrical parameters, and further enhance electrical performance.

According to an embodiment of the present disclosure, the central axis of the circular tubular winding portion coincides with the central axis of the glass tube body.

According to an embodiment of the present disclosure, the coil heat dissipation structure includes a plurality of heat dissipation grooves arranged on opposite end surfaces of the two heads, and the plurality of heat dissipation grooves are distributed around a cylindrical surface, and the central axis of the cylindrical surface coincides with the central axis of the glass tube body.

According to an embodiment of the present disclosure, the head also has a plurality of side surfaces connected to the end surface, and one end of each of the heat dissipation grooves extends to the side surface of the head, and the other end is located on the cylindrical surface.

According to an embodiment of the present disclosure, a coil lead pin is provided on the upper portion of each of the heads, and one end of the two coil lead pins is electrically connected to two ends of the enameled wire of the coil respectively.

According to an embodiment of the present disclosure, the two heads are respectively provided with positioning grooves, the two positioning grooves are located on the same side of the winding portion, and the other end of each coil lead-out pin is partially located in the positioning groove after being bent.

According to an embodiment of the present disclosure, each of the heads is provided with a wire passing groove near one end of the coil lead-out pin; and at least one of the heads is provided with a winding clamping groove.

The wire groove can prevent the lead wire from moving on the head of the coil frame and breaking, and at the same time, the wire groove can protect the lead wire. The winding clamping groove is convenient for winding positioning on the coil frame.

According to one embodiment of the present disclosure, the cross-sectional profile shape of each of the heads along a direction perpendicular to the central axis of the glass tube body includes a first rectangle and a second rectangle arranged in the middle of the first rectangle, wherein the size of the second rectangle in the direction perpendicular to the central axis of the glass tube body is smaller than the size of the first rectangle.

According to one embodiment of the present disclosure, each of the reed lead-out legs extending out of the head is cylindrical, and a flat portion is processed in the middle portion of each reed lead-out leg extending out of the head, and the flat portion is parallel or perpendicular to the contact surface of the contact of the reed.

A flat portion is provided in the middle of the tongue reed lead pin, which can make the tongue reed lead pin more firmly connected to the housing, and can more conveniently identify the direction of the contact surface of the contact of the tongue reed, facilitate setting the working direction of the contact surface of the contact, and improve the action reliability and anti-interference performance. In addition, when the coil skeleton is formed by injection molding, the flat portion can be used for positioning, and the flat portion is convenient for assembly or processing of the housing in the subsequent process.

According to an embodiment of the present disclosure, the injection molding process part is arranged on one of the two heads and is located in the middle of the end surface away from the winding part. When injecting glue, the glue flows along the axial direction and radial direction of the glass tube. This form of using a single lateral glue inlet can reduce the injection molding pressure and reduce the scouring force of the plastic on the glass tube; at the same time, it ensures that the plastic at the sintering section position flows approximately in the radial direction, thereby ensuring the expansion matching of the plastic and the glass to the greatest extent. (The expansion of plastic in the flow direction is smaller than that in the vertical flow direction, which is closer to the expansion of glass), and the plastic flow direction of the sintered sections at both ends is consistent, which better protects the glass tube of the reed switch. Improve the yield rate of injection molding coil skeletons.

The beneficial effects of the present disclosure are as follows:

1. The glass tube of the reed switch is covered with plastic to form an integral rigid connection with the plastic to avoid disturbance of the glass tube caused by external vibration, avoid the risk of cracking of the glass tube or damage to the bonding interface of the sintered section caused by disturbance, and make the sealing fail. This ensures the initial sealing of the glass tube of the reed switch and better adapts to applications with high requirements for vibration resistance.

2. The reed lead-out pin of the reed switch has a section that is covered and fixed by the head of the coil frame, and each of the sintered sections is partially or completely located in the head of a coil frame. This can prevent the clamping position of the reed lead-out pin from being too close to the glass tube sintered section during the injection molding of the coil frame, thereby directly transferring the deformation stress to the root of the glass tube sintered section and causing sealing failure; it can also ensure that the plastic-covered section has a certain strength, thereby avoiding the reprocessing of the reed lead-out pin after the injection molding of the coil frame, due to the mechanical stress being transferred to the root of the glass tube sintered section, causing damage to the glass tube sintered section, thereby improving the overall structural strength of the reed switch.

3. Each of the heads is provided with a coil heat dissipation structure near the sintering section, which reduces the influence of the inability of plastic, glass and metal to expand synchronously, and avoids the influence of squeezing caused by uneven thermal stress on the sealing of the glass tube. At the same time, the coil heat dissipation structure can increase the creepage distance of the reed relay, and the coil heat dissipation structure is a heat dissipation groove with a weight-reducing effect, which reduces the influence of the flexible deformation of the coil skeleton caused by the centrifugal effect under high-speed rotation when the coil is wound on the coil skeleton, thereby damaging the sealing of the glass tube.

4. This reed relay does not need to be encapsulated with glue, and will not separate low molecular weight substances to deteriorate the insulation after connection, thereby improving the insulation performance of the reed relay.

5. The coil skeleton is formed by injection molding and covers the entire glass tube, which is conducive to automatic production.

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

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other features and advantages of the present disclosure will become more apparent by describing in detail example embodiments thereof with reference to the attached drawings.

FIG1 is a perspective view of a reed switch in the related art;

FIG2 is a schematic diagram of the structure of the reed switch of FIG1 ;

FIG3 is a perspective view of a first embodiment of a reed relay disclosed herein;

FIG4 is a top view of FIG3;

Fig. 5 is a cross-sectional view along line A-A in Fig. 4;

6 is a schematic diagram of the injection molding process and the flow direction of the rubber material during the coil skeleton injection molding;

FIG7 is a perspective view of a second embodiment of a reed relay disclosed herein;

FIG8 is a top view of FIG7;

Fig. 9 is a cross-sectional view along line B-B in Fig. 8;

10 is a perspective view of the connection between the reed switch and the coil skeleton in the second embodiment of the present disclosure;

FIG11 is a schematic diagram of a connection state between the second embodiment of the present disclosure and a PCB circuit board;

FIG12 is a perspective view of a third embodiment of a reed relay disclosed herein;

FIG13 is a schematic diagram of a connection state between the third embodiment of the present disclosure and a PCB circuit board;

FIG14 is a perspective view of a reed relay according to a fourth embodiment of the present disclosure;

FIG15 is a top view of FIG14;

Fig. 16 is a cross-sectional view along line C-C in Fig. 15;

17 is a three-dimensional diagram of a reed switch connected to a coil frame in the fourth embodiment of the present disclosure;

FIG18 is a schematic diagram of a reed relay connected to a PCB circuit board in a fourth embodiment of the present disclosure;

FIG19 is a schematic diagram of a reed relay connected to a PCB circuit board according to a fifth embodiment of the present disclosure;

FIG20 is a schematic diagram of a reed relay according to a sixth embodiment of the present disclosure connected to a PCB circuit board;

FIG21 is a perspective view of a reed relay according to a sixth embodiment of the present disclosure;

FIG22 is a schematic diagram of a reed relay according to a seventh embodiment of the present disclosure connected to a PCB circuit board;

FIG. 23 is a schematic diagram of a reed relay according to an eighth embodiment of the present disclosure connected to a PCB circuit board.

Detailed ways

Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein. Although relative terms such as "above" and "below" are used in this specification to describe the relative relationship of one component of the illustration to another component, these terms are used in this specification only for convenience, such as according to the orientation of the examples described in the accompanying drawings. It is understood that if the device of the illustration is flipped so that it is upside down, the component described as being "above" will become the component "below". Other relative terms, such as "top", "bottom", etc., are also used to have similar meanings. When a structure is "on" other structures, it may mean that the structure is formed integrally on the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure through another structure.

The terms "a", "an", "the" and "said" are used to indicate the presence of one or more elements/components/etc.; the terms "including" and "having" are used to express an open-ended inclusive meaning and mean that additional elements/components/etc. may exist in addition to the listed elements/components/etc.; the terms "first", "second", etc. are used merely as labels and are not intended to limit the quantity of their objects.

Embodiment 1

As shown in Fig. 1 and Fig. 2, the reed switch 1 comprises a glass tube 11, and the glass tube 11 comprises a cylindrical glass tube body 11a, and sintered sections 11b are provided at both ends of the glass tube body 11a. Two reed pieces 12 that can contact or separate from each other are installed in the glass tube body 11a. Two reed lead pins 13 respectively pass through the two sintered sections 11b along the central axis of the glass tube body 11a, and the glass tube 11 is filled with an inert gas or is in a vacuum state. The connecting section 12a connecting the reed piece 12 and the reed lead pin 13 adopts a flat structure, and the two connecting sections 12a can be bent or tilted relative to the central axis of the glass tube body 11a so that the contacts of the two reed pieces 12 face each other and have a The distance between the two reed pieces 12 is such that the contacts of the two reed pieces 12 can contact or separate from each other to achieve the function of a switch.

Referring to FIGS. 3 to 5 , in the first embodiment of the reed relay disclosed in the present invention, the coil skeleton 2 is formed by injection molding and covers the entire glass tube 11. The coil skeleton 2 includes a middle tubular winding portion 21 and two heads 22 connecting the two ends of the winding portion 21. The length of the tubular winding portion 21 is slightly longer than the length of the glass tube body 11a. One end of the two reed lead pins 13 respectively passes through the middle position of the end faces of the two heads 22. Each of the sintered sections 11b is partially located in one of the heads 22, and each of the sintered sections 11b can also be completely located in one of the heads 22. A portion of each reed lead pin 13 is covered and fixed by one of the heads 22. Each of the heads 22 is provided with a coil heat dissipation structure 24 near the sintered section 11b. The head 22 has an outer end face facing away from the winding portion 21 and a plurality of side faces connected to the outer end face, and the two outer end faces of the two heads 22 are arranged oppositely.

Referring to FIG. 3 and FIG. 5 , the central axis of the cylindrical winding portion 21 coincides with the central axis of the glass tube body 11a; the coil heat dissipation structure 24 includes a plurality of heat dissipation grooves 241 disposed on the outer end surface of the head 22, and the plurality of heat dissipation grooves 241 are distributed around a cylindrical surface 242, and the central axis of the cylindrical surface 242 coincides with the central axis of the glass tube body 11a. One end of each heat dissipation groove 241 extends to the side of the head 22, and the other end is located on the cylindrical surface 242.

A coil lead pin 23 is provided on the upper portion of each head 22 , and one end 40 of the two coil lead pins 23 is respectively wound around two ends of the coil enameled wire and electrically connected.

The two heads 22 are provided with positioning grooves 221, and the two positioning grooves 221 of the two heads 22 are located on the same side of the winding portion 21. The other end of each coil lead-out pin 23 is bent and partially located in the positioning groove 221.

Each of the heads 22 is provided with a wire passing groove 222 at one end 40 close to the coil lead-out pin 23; the wire passing groove 222 can be set to be U-shaped, V-shaped or arc-shaped; the wire passing groove 222 facilitates the end of the coil enameled wire to be wound around one end 40 of the coil lead-out pin 23; at least one of the heads 22 is provided with a winding clamping groove 223, so as to facilitate the clamping and positioning of the coil frame 2 and then winding to form a coil.

The shape of the cross-sectional profile of each head 22 along a direction perpendicular to the central axis of the glass tube body 11a includes a first rectangle and a second rectangle arranged in the middle of the first rectangle, wherein the size of the second rectangle in the direction perpendicular to the central axis of the glass tube body 11a is smaller than the size of the first rectangle.

The reed lead pin 13 is cylindrical, and a flat portion 131 is processed in the middle part of each reed lead pin 13 passing through the head 22. The flat portion 131 is parallel to the contact surface of the contact of the reed 12, and the flat portion 131 and the contact surface of the contact of the reed 12 can also be set to be perpendicular to each other, so that the direction of the contact surface of the contact of the reed 12 can be better identified; at the same time, the flat portion 131 can be used for positioning when the coil skeleton 2 is formed by injection molding, which is convenient for the assembly or processing of the shell in the subsequent process.

The central axis of the glass tube 11 coincides with the central axis of the coil frame 2, which is beneficial for coinciding the contact center of the reed 12 (where the air gap is largest) with the window center of the coil frame 2 (where the coil magnetic flux is most dense), thereby fully utilizing the coil magnetic flux and improving the consistency of electrical parameters, thereby further enhancing electrical performance.

As shown in Figures 5 and 6, an injection molding process part 2a, such as an injection molding process port or an injection molding process protrusion, is formed on the coil skeleton 2. The injection molding process part 2a is formed when the coil skeleton 2 is injection molded outside the glass tube 11, and the injection molding process part 2a corresponds to the injection port on the injection mold.

As shown in FIG6 , the injection molding process part 2a is arranged on one of the two heads 22 and is located in the middle position of the end face of the head 22 away from the winding part 21 . When injecting glue, the glue flows along the axial and radial directions of the glass tube 11 (as indicated by the arrows in FIG6 ).

When the coil skeleton 2 is injection molded, a single injection port is used to inject glue sideways, which can reduce the injection pressure and the scouring force of the plastic on the glass tube 11; at the same time, the plastic at the sintering section 11b is ensured to flow approximately radially, thereby ensuring the expansion matching of the plastic and the glass to the greatest extent (the expansion of the plastic in the flow direction is smaller than that in the vertical flow direction, and is closer to the expansion of the glass), and the plastic flow directions of the sintering sections 11b at both ends are consistent, so as to better protect the glass tube 11 of the reed switch 1.

In addition, existing reed relays usually include a reed switch, a coil skeleton, a coil and a housing. The reed switch is the core component of the reed relay, so the difficulty in manufacturing the reed relay lies in how to ensure the initial sealing of the reed switch to the greatest extent. The packaging of the existing reed relay housing mainly adopts the potting method. The reed switch, the coil part, and the coil skeleton part are first assembled into a magnetic circuit system, and then the magnetic circuit system is placed in the housing for potting and potting. This structure using potting and potting is easy to separate low-molecular weight substances and deteriorate the insulation performance of the reed relay, and has defects such as easy formation of cavities inside and easy bulging of the rubber surface, which affects the overall quality of the reed relay. In addition, the structure using potting and potting is difficult to set the magnetic circuit system in the center of the housing, which will also affect the overall quality of the reed relay.

The present disclosure also provides a reed relay, which has good insulation performance and can better ensure the initial sealing of the reed switch, thereby improving the quality of the reed relay.

According to one aspect of the present disclosure, a reed relay includes a reed switch, a coil skeleton, a coil and a shell, the reed switch includes a glass tube, the glass tube includes a cylindrical glass tube body, sintered sections are provided at both ends of the glass tube body, two reeds that can contact or detach from each other are installed in the glass tube body, the reed lead pins of the two reeds respectively pass through the two sintered sections along the central axis of the glass tube body, the glass tube is fixed in the middle of the coil skeleton, one end of the two reed lead pins respectively passes through the middle position of the two ends of the coil skeleton; the coil is wound on the coil skeleton; the shell is formed by injection molding and covers the coil skeleton and the coil; the two reed lead pins are partially extended out of the shell; the shell is provided with a shell heat dissipation structure near the two ends of the coil skeleton.

According to an embodiment of the present disclosure, the coil skeleton is centrally arranged in the shell; each of the shell heat dissipation structures includes a plurality of heat dissipation grooves arranged at one end of the shell, and the plurality of heat dissipation grooves are symmetrically arranged up and down relative to a horizontal plane passing through the central axis of the glass tube body.

According to one embodiment of the present disclosure, the coil skeleton is formed by injection molding and covers the entire glass tube. The coil skeleton includes a middle tubular winding part and two heads connecting the two ends of the winding part, and two tongue reed lead-out pins respectively pass through the middle position of the two head end faces along the central axis of the winding part; a coil is wound on the winding part, each of the sintered sections is partially or completely located in one of the heads, and the glass tube is centrally arranged in the coil skeleton; a coil lead-out pin is passed through each head, and one end of the two coil lead-out pins are respectively electrically connected to the two ends of the coil enameled wire, and the other ends of the two coil lead-out pins pass through the outside of the shell.

In this way, the glass tube of the reed switch is covered with plastic, forming an overall rigid connection with the plastic, avoiding disturbance of the glass tube caused by external vibration, avoiding the risk of cracking of the glass tube or destruction of the bonding interface of the sintered section caused by disturbance, thereby ensuring the initial sealing of the glass tube of the reed switch and effectively improving the vibration resistance.

Secondly, the glass tube is centrally arranged in the coil frame, which is conducive to achieving the coincidence of the center of the reed switch tongue contact (the largest air gap) and the center of the coil frame window (the most dense coil flux), which can fully utilize the coil flux and improve the consistency of electrical parameters, further improving electrical performance.

According to an embodiment of the present disclosure, the two heads are respectively provided with positioning grooves, the two positioning grooves are located on the same side of the winding portion, and the bent portion of each coil lead-out leg is located in the positioning groove.

The coil lead pins are constrained in length and height directions by the positioning grooves to prevent the coil lead pins from being skewed and unable to be placed in the mold cavity before the shell is injected, or from being deformed by plastic during the shell injection molding process.

According to an embodiment of the present disclosure, the shell is provided with two pairs of limit grooves, the two pairs of limit grooves are respectively close to the two heads, and each pair of limit grooves is respectively arranged on both sides of the shell.

The limiting grooves can constrain the coil skeleton in the width direction of the shell to ensure that the coil skeleton is centrally distributed in the shell, and ultimately achieve uniformity and symmetry in the expansion of the shell in all directions.

According to one embodiment of the present disclosure, two coil lead pins and two reed lead pins extending out of the shell are respectively located on both sides of the shell, the coil lead pin extending out of the shell is close to one side of the shell heat dissipation structure, and each reed lead pin extending out of the shell is close to the other side of the shell heat dissipation structure.

In this way, the creepage distance between the reed lead pin and the coil lead pin can be extended through the shell heat dissipation structure, thereby improving the electrical performance.

According to an embodiment of the present disclosure, the material properties of the coil skeleton are the same as the material properties of the shell.

According to one embodiment of the present disclosure, the tongue reed lead-out pin body is cylindrical, and each tongue reed lead-out pin that passes through the middle position of the end face of the coil skeleton head is bent 90° in the horizontal direction to form a first bending section. A flat portion is provided on the first bending section, and the flat portion is perpendicular or parallel to the contact surface of the tongue reed contact. The flat portion is first used for positioning injection molding to form the coil skeleton, and then the flat portion is used for positioning or the coil skeleton is used for positioning injection molding to form the shell, and the flat portion is enclosed in the shell.

This not only makes the reed lead-out pin more firmly bonded to the housing, but also makes it easier to identify the direction of the contact surface of the reed contact, making it easier to determine the installation direction of the reed relay and maximizing the working performance of the reed relay.

According to one embodiment of the present disclosure, the flat portion includes two parallel planes, which are parallel or perpendicular to the contact plane of the reed contact, and the distance between the two parallel planes is smaller than the diameter of the reed lead-out leg body. The two parallel planes form an oblique angle at the connection with the reed lead-out leg body.

The pit formed by the parallel plane and the bevel is filled with plastic, which acts as a positioning pin, effectively preventing the reed lead from rotating in the circumferential direction, and preventing the reed lead from rotating under the action of external force during the bending process, thereby destroying the sealing of the reed switch. Secondly, the bevel is conducive to the separation of the mold insert and the part, avoiding deformation caused by pulling the part during demolding.

According to an embodiment of the present disclosure, the first bending section passes through the housing portion and then is bent 90° in the longitudinal direction to form a second bending section. When the reed relay is installed on a PCB, the second bending section is plugged or fitted with the PCB, and the contact surface of the reed contact is perpendicular to the PCB. This can improve the vibration and impact resistance of the reed relay and prevent malfunction.

According to an embodiment of the present disclosure, each of the heads is provided with a coil heat dissipation structure near the sintering section.

By arranging a coil heat dissipation structure near the sintering section at each head, the influence of the non-synchronous expansion of plastic, glass and metal is reduced, and the extrusion caused by uneven thermal stress and the influence on the initial sealing of the glass tube are avoided.

According to one embodiment of the present disclosure, the central axis of the tubular winding portion coincides with the central axis of the glass tube body, and the coil heat dissipation structure includes a plurality of heat dissipation grooves arranged on the head, and the plurality of heat dissipation grooves are distributed around a cylindrical surface, and the central axis of the cylindrical surface coincides with the central axis of the glass tube body.

According to one embodiment of the present disclosure, a plurality of limiting protrusions are provided at the bottom of the shell. When the reed relay is installed on a PCB circuit board, the plurality of limiting protrusions limit the distance between the bottom of the shell and the PCB circuit board, thereby ensuring that the reed relay has sufficient heat dissipation space when working.

The beneficial effects of the present disclosure are as follows:

1. The shell is formed by injection molding and covers the coil frame and the coil. The two coil lead pins and the two reed lead pins are all extended out of the shell; the shell is provided with a shell heat dissipation structure near both ends of the coil frame. The shell heat dissipation structure can improve the thermal conductivity of the plastic, increase the heat exchange area between the plastic and the air during the use of the product, and increase the contact area between the plastic and the mold during the injection molding process, improve the thermal conductivity/heat dissipation effect, and achieve synchronous thermal conduction of "metal-glass" and "plastic-glass", avoiding excessive temperature gradients around the sintering section of the glass tube before thermal equilibrium, thereby expanding the expansion difference between different materials, causing adjacent materials to be subjected to thermal stress due to expansion mismatch, preventing the glass tube from being damaged by extrusion or tensile stress, ensuring the initial sealing of the reed switch, and improving the quality of the reed relay.

2. Improve the insulation capacity between input and output. The integrated injection molding of the shell and coil frame can avoid the defects of potting, such as the separation of low molecular weight substances and deterioration of insulation, the formation of cavities inside and the bulging of the rubber surface, etc., improve the insulation performance and the quality of the reed relay. Furthermore, through the heat dissipation structure, the creepage distance between the reed lead pin and the coil lead pin can also be expanded to improve the electrical performance.

3. Improving the assembly accuracy of the coil skeleton in the shell can better ensure that the skeleton is centrally distributed in the shell, achieve uniformity and symmetry of the shell plastic wall thickness in all directions, and ensure the uniformity and symmetry of expansion to the greatest extent.

Embodiment 2

As shown in FIG. 1 and FIG. 2 , the reed switch 1 comprises a glass tube 11, which comprises a glass tube body 11a in the shape of a circular tube, sintered sections 11b are provided at both ends of the glass tube body 11a, and two reed pieces 12 that can contact or separate from each other are arranged in the glass tube body 11a. Two reed lead pins 13 respectively pass through the two sintered sections 11b along the central axis of the glass tube body 11a, and the glass tube 11 is filled with an inert gas or is in a vacuum state. The connecting section 12a connecting the reed piece 12 and the reed lead pin 13 adopts a flat structure, and the two connecting sections 12a can be bent or tilted relative to the central axis of the glass tube body 11a, so that the contacts of the two reed pieces 12 face each other and have a distance, so that the contacts of the two reed pieces 12 can contact or separate from each other to achieve the function of the switch.

Referring to Fig. 9 and Fig. 10, the second embodiment of the reed relay disclosed in the present invention comprises a reed switch 1, a coil frame 2, a coil 3 and a housing 4. The glass tube 11 is fixedly arranged in the middle of the coil frame 2, and two reed lead pins 13 are respectively extended from the middle positions of the two ends of the coil frame 2; the coil 3 is wound on the coil frame 2, and the spacer on the coil frame 2 is fixedly arranged. Two coil lead pins 23 are provided, and the two coil lead pins 23 are respectively wound around the two ends of the enameled wire of the coil 3 and electrically connected.

Referring to Fig. 7 to Fig. 9, the shell 4 is formed by injection molding and covers the coil frame 2 and the coil 3. The coil frame 2 is centrally arranged in the shell 4, and the two coil lead pins 23 and the two reed lead pins 13 are partially extended out of the shell 4. The shell 4 is provided with a shell heat dissipation structure 41 near both ends of the coil frame 2. Each of the shell heat dissipation structures 41 includes a plurality of heat dissipation grooves 411 arranged at one end of the shell 4, and the plurality of heat dissipation grooves 411 are symmetrically arranged up and down relative to a horizontal plane passing through the central axis of the glass tube body 11a.

Referring to Figures 9 and 10, the coil skeleton 2 is formed by injection molding and covers the entire glass tube 11. The coil skeleton 2 includes a middle tubular winding portion 21 and two heads 22 connecting the two ends of the winding portion 21. Two tongue reed lead pins 13 are respectively passed through the middle position of the two heads 22 along the central axis of the winding portion 21; the coil 3 is wound on the winding portion 21, and each of the sintered sections 11b is partially located in the head 22, or can be completely located in the head 22. The glass tube 11 is centrally arranged in the coil skeleton 2, that is, the central axis of the glass tube body 11a coincides with the central axis of the coil skeleton 2; each head 22 is provided with a coil lead pin 23, and one end of the two coil lead pins 23 is respectively wound and electrically connected to the two ends of the enameled wire of the coil 3.

10, the two heads 22 are respectively provided with a positioning groove 221, and the two positioning grooves 221 are located on the same side of the winding portion 21. The bent portion of each coil lead leg 23 is located in the positioning groove 221. The mouth of the positioning groove 221 is provided with a chamfer 221a to facilitate the flow of rubber during the injection molding of the housing 4.

Referring to Fig. 12, two pairs of limiting grooves 43 are provided on the housing 4, the two pairs of limiting grooves 43 are respectively close to the two heads, and each pair of limiting grooves 43 is respectively provided on both sides of the housing 4. The limiting grooves 43 on both sides of the housing 4 can constrain the coil skeleton 2 in the width direction of the housing 4, ensuring that the coil skeleton 2 is centrally distributed in the housing 4, thereby achieving uniformity and symmetry in the expansion of the housing 4 in all directions.

Referring to Fig. 11, the two coil lead pins 23 and the two reed lead pins 13 passing through the housing 4 are respectively located on both sides of the housing 4, each coil lead pin 23 passing through the housing 4 is close to the housing heat dissipation structure 41 and located on one side of the housing heat dissipation structure 41, and each reed lead pin 13 passing through the housing 4 is close to the housing heat dissipation structure 41 and located on the other side of the housing heat dissipation structure 41. In this way, the creepage distance between the coil lead pin 23 and the reed lead pin 13 can be increased.

Referring to Fig. 10, each of the head portions 22 is provided with a coil heat dissipation structure 24 near the sintering section 11b. The central axis of the cylindrical winding portion 21 coincides with the central axis of the glass tube body 11a, and the coil heat dissipation structure 24 includes a plurality of heat dissipation grooves 241 provided on the head portion 22, the plurality of heat dissipation grooves 241 are distributed around a cylindrical surface 242, and the central axis of the cylindrical surface 242 coincides with the central axis of the glass tube body 11a.

The main body of the reed lead-out pin 13 is cylindrical. Before the shell 4 is injected, as shown in Figure 10, each reed lead-out pin 13 that passes through the middle position of the head 22 of the coil skeleton 2 is first bent 90° in the horizontal direction to form a first bent section 13a. The first bent section 13a is provided with a flat portion 131. The flat portion 131 is perpendicular to the contact surface of the contact of the reed 12, and can also be set to be parallel; then the flat portion 131 is first used to perform positioning injection molding to form the coil skeleton 2, and then the flat portion 131 is used for positioning or the coil skeleton 2 is used for positioning injection molding to form the shell 4, and the flat portion 131 is enclosed in the shell 4.

10 and 11, the flat portion 131 includes two parallel planes, which are parallel to the tongue reed 12. The contact planes are perpendicular to each other, and the plane can also be parallel to the contact plane of the reed 12; the distance between the two parallel planes is smaller than the diameter of the main body of the reed lead pin 13, and the connection between the two parallel planes and the main body of the reed lead pin 13 forms an angle 132. In this way, the pit formed by the parallel planes and the angle 132 is filled with plastic, and the plastic acts as a positioning pin, which can effectively prevent the reed lead pin 13 from rotating in the circumferential direction, and prevent the reed lead pin 13 from rotating under the action of external force during the bending process and damaging the sealing of the reed switch 1. Secondly, the angle 132 is conducive to the separation of the mold insert and the part, and avoids the deformation caused by pulling the part during demolding.

The material properties of the coil frame 2 used for injection molding are the same as the material properties of the housing 4 used for injection molding.

Referring to FIG. 11 , the first bent section 13a passes through the housing 4 and then bends 90° in the longitudinal direction to form a second bent section 13b. When the reed relay of this embodiment is installed on the PCB circuit board 10, the second bent section 13b is plugged into the PCB circuit board 10, and the contact surface of the contact of the reed 12 is perpendicular to the PCB circuit board 10. This structure facilitates the plug-in installation of this embodiment with the PCB circuit board 10, and can also effectively improve the vibration and impact resistance of this embodiment and prevent malfunction. In order to facilitate the plug-in installation with the PCB circuit board 10, the two coil lead pins 23 passing through the housing 4 are bent 90° in the longitudinal direction to form a plug-in section 23a, and the two plug-in sections 23a are plugged into the PCB circuit board 10.

In this embodiment, the two parallel planes of the flat portion 131 are parallel to the PCB circuit board 10. As a variation, the two parallel planes of the flat portion 131 can also be arranged to be perpendicular to the PCB circuit board 10.

The bottom of the housing 4 is provided with four limiting protrusions 45 . When the reed relay is installed on the PCB circuit board 10 , the four limiting protrusions 45 limit the distance between the bottom of the housing 4 and the PCB circuit board 10 .

Embodiment 3

As shown in Figures 12 to 14, the structure of the third embodiment of the reed relay disclosed in the present invention is different from that of the first embodiment in that the lower end of the second bending section 13b is bent again by 90° in the horizontal direction to form a flat fitting portion 131b. When the reed relay of this embodiment is installed on the PCB circuit board 10, the flat fitting portion 131b at the lower end of the second bending section 13b fits with the PCB circuit board 10 to form a fitted installation. At this time, the lower ends of the plug-in sections 23a of the two coil lead pins 23 are also bent again by 90° in the horizontal direction to form a second flat fitting portion 231a, and the second flat fitting portion 231a fits with the PCB circuit board 10. This embodiment facilitates the fitted installation with the PCB circuit board 10.

In addition, the existing reed relay usually includes a reed switch, a coil frame, a coil and a housing. The reed switch includes a glass tube, and two reeds are installed in the glass tube. Two reed lead pins pass through the two ends of the glass tube. The coil is wound on the coil frame. The glass tube is fixedly connected to the middle of the coil frame. The housing covers the coil frame and the coil and is sealed by glue injection. The two reed lead pins and the two coil lead pins pass through the housing. Most reed relays need to be installed on a PCB circuit board (printed circuit board) to play their role. The installation is achieved by installing the two reed lead pins and the two coil lead pins on the PCB circuit board. However, since the reed lead pins in the reed switch are cylindrical and the glass tube body in the reed switch is tubular, when the reed switch is fixedly connected to the middle of the coil frame, the circumferential position of the reed switch is random and difficult to locate, that is, the contact position of the reed is random. Once the reed relay is installed on the PCB, the contact plane of the reed tongue is parallel to the PCB. At this time, the contact of the reed tongue has the weakest impact and vibration resistance, which may cause malfunction and affect the operation of the reed relay. The reliability of the operation is affected, and the impact resistance of the reed relay is reduced.

The present disclosure also provides a reed relay, which can improve the impact resistance of the contacts in the reed relay and prevent the reed relay from malfunctioning.

According to one aspect of the present disclosure, a reed relay includes a reed switch, a coil skeleton, a coil and a shell. The reed switch includes a glass tube, the glass tube includes a cylindrical glass tube body, sintered sections are provided at both ends of the glass tube body, two reeds that can contact or detach from each other are installed in the glass tube body, the reed lead pins of the two reeds pass through the two sintered sections, the glass tube is fixedly connected in the middle of the coil skeleton, one end of the two reed lead pins respectively passes through the two ends of the coil skeleton, the coil is wound on the coil skeleton, the coil skeleton and the coil are covered by the shell, the main body of the reed lead pin is a conductive cylinder, at least one reed lead pin passing through the two ends of the coil skeleton is provided with a flat portion, the flat portion is parallel to or perpendicular to the contact plane of the reed contact, the two reed lead pins partially pass through the shell and then connect to the PCB circuit board, and are positioned by the flat portion of the reed lead pin so that the contact plane of the reed contact is perpendicular to the PCB circuit board.

According to an embodiment of the present disclosure, the shell is positioned by the flat portion and then formed by injection molding the coil skeleton and the coil to improve the bonding strength and insulation performance.

According to an embodiment of the present disclosure, the flat portion is inside the shell and combined with the shell. Since the flat portion is covered by the plastic shell, the reed lead-out pin that passes through the shell can be prevented from rotating due to the tangential force in the circumferential direction during the subsequent processing, thereby improving the anti-rotation effect of the reed lead-out pin and further reducing the risk of external mechanical force damaging the sealing of the glass body sintering section.

According to an embodiment of the present disclosure, the flat portion is outside the housing, and after the tongue reed lead-out pin is connected to the PCB circuit board, the flat portion abuts against the upper end of the PCB circuit board to limit the distance between the bottom of the housing and the PCB circuit board, or the flat portion fits on the upper end of the PCB circuit board to form an electrical connection. In this way, when the flat portion plays a limiting role, the heat dissipation effect of the reed relay can be enhanced, and when the flat portion fits on the upper end of the PCB circuit board to form an electrical connection, it is convenient for the reed relay to be fitted and installed, and it can also play a limiting role.

According to an embodiment of the present disclosure, two tongue reed lead pins passing through the two ends of the coil skeleton are provided with two flat parts, one flat part on each tongue reed lead pin is inside the housing and combined with the housing, and the other flat part is outside the housing. After the tongue reed lead pin is connected to the PCB circuit board, the flat part outside the housing abuts against the upper end of the PCB circuit board to limit the distance between the bottom of the housing and the PCB circuit board, or the flat part fits on the upper end of the PCB circuit board to form an electrical connection. In this way, the two flat parts can not only improve the anti-rotation effect of the tongue reed lead pin, but also facilitate the fitting installation of the reed relay, and also play a limiting role.

According to one embodiment of the present disclosure, a plurality of limiting protrusions are provided at the bottom of the shell. When the reed relay is installed on a PCB circuit board, the plurality of limiting protrusions limit the distance between the bottom of the shell and the upper end surface of the PCB circuit board, thereby facilitating heat dissipation when the reed relay is working.

According to an embodiment of the present disclosure, the flat portion includes two parallel planes, the two parallel planes are parallel or perpendicular to the contact plane of the tongue reed contact, the distance between the two parallel planes is smaller than the diameter of the tongue reed lead leg body, and the two parallel planes form an oblique angle at the connection with the tongue reed lead leg body. In this way, the pit formed by the parallel planes and the oblique angle is filled with plastic, and the plastic acts as a positioning pin, which can effectively prevent the tongue reed lead leg from moving along the circumference. The bevel is conducive to the separation of the mold insert and the part, avoiding deformation caused by pulling the part during demoulding.

According to an embodiment of the present disclosure, the coil skeleton is formed by injection molding and covers the entire glass tube. The coil skeleton includes a middle tubular winding part and two heads connecting the two ends of the winding part. Two tongue reed lead pins pass through the middle position of the two head end faces along the central axis of the winding part; the coil is wound on the winding part, and each of the sintered sections is partially or completely in one of the heads; a coil lead pin is fixed on each head, and one end of the two coil lead pins is respectively wound and electrically connected to the two ends of the coil enameled wire; the two coil lead pins pass through the shell and then connect to the PCB circuit board. This structure can improve the anti-interference and rupture ability of the reed switch glass tube, ensure the initial sealing of the reed switch glass tube, and facilitate automated production.

According to one embodiment of the present disclosure, the flat portion is used for positioning injection molding to form the coil skeleton, and the two heads are respectively provided with positioning grooves, and the two positioning grooves are arranged on the same side of the glass tube body. The bent portion of each coil lead-out leg is located in the positioning groove, so that the shell is also used for covering the coil skeleton and the coil by injection molding in the later stage.

According to an embodiment of the present disclosure, each of the heads is provided with a coil heat dissipation structure near the sintering section, the central axis of the cylindrical winding portion coincides with the central axis of the glass tube body, and the coil heat dissipation structure includes a plurality of heat dissipation grooves provided on the head, and the plurality of heat dissipation grooves are distributed around a cylindrical surface, and the central axis of the cylindrical surface coincides with the central axis of the glass tube body. The coil heat dissipation structure reduces the influence of the inability of plastic, glass, and metal to expand synchronously, thereby achieving the purpose of avoiding extrusion caused by uneven thermal stress and affecting the sealing of the glass tube. At the same time, the coil heat dissipation structure can increase the creepage distance of the connection structure, and at the same time, after reducing the weight, reduce the centrifugal effect of winding the coil on the coil frame.

In the present invention, at least one of the tongue reed lead pins extending from both ends of the coil skeleton is provided with a flat portion, and the flat portion is parallel or perpendicular to the contact plane of the tongue reed contact, so that it is easy to identify the direction of the contact plane of the tongue reed contact. When the two tongue reed lead pins are connected to the PCB circuit board after extending from the housing, it can be ensured that the contact plane of the tongue reed contact is oriented in a set direction, and can be positioned by the flat portion of the tongue reed lead pin so that the contact plane of the tongue reed contact is perpendicular to the PCB circuit board. The contact plane of the tongue reed contact is perpendicular to the PCB circuit board, and its vibration resistance is the strongest, which improves the vibration and impact resistance of the contacts in the reed relay, and effectively prevents the reed relay from malfunctioning.

Furthermore, the flat portion also has an anti-rotation function, which can reduce the risk of external torsion causing rotational displacement between the tongue reed and the glass sintering section and damaging the sealing of the glass tube.

Embodiment 4

As shown in Fig. 1, Fig. 2, Fig. 14 to Fig. 18, the reed relay 10 of the fourth embodiment of the present disclosure includes a reed switch 1, a coil frame 2, a coil 3 and a housing 4. The reed switch 1 includes a glass tube 11, and the glass tube 11 includes a cylindrical glass tube body 11a, and sintered sections 11b are provided at both ends of the glass tube body 11a. Two reeds 12 that can contact or separate from each other are installed in the glass tube body 11a, and two reed lead pins 13 pass through the two sintered sections 11b. The glass tube 11 is filled with an inert gas or is in a vacuum state. The glass tube 11 is fixedly connected to the middle of the coil frame 2, and one end of the two reed lead pins 13 passes through the two ends of the coil frame 2 respectively. The specific connection method between the reed switch 1 and the coil frame 2 is: the coil frame 2 is formed by injection molding and covers the entire glass tube 11. The coil frame 2 includes a middle cylindrical winding part 21 and two heads 22 connecting the two ends of the winding part 21. The two reeds The lead pin 13 passes through the middle of the end faces of the two heads 22 along the central axis of the winding part 21. The glass tube 11 of the reed switch 1 is centrally arranged in the coil frame 2, and the coil 3 is wound on the winding part 21. Each of the sintered sections 11b is partially located in one of the heads 22, and each of the sintered sections 11b can also be completely located in one of the heads 22. A coil lead pin 23 is fixed on each head 22, and one end of the two coil lead pins 23 is respectively wound and electrically connected with the two ends of the enameled wire of the coil 3; the two coil lead pins 23 are partially connected to the PCB circuit board 20 after passing through the housing 4.

The two heads 22 are respectively provided with positioning grooves 221, and the two positioning grooves 221 are located on the same side of the winding portion 21. The bent portion of each coil lead-out leg 23 is located in the positioning groove 221.

Each of the heads 22 is provided with a coil heat dissipation structure 24 near the sintering section 11b, and the central axis of the tubular winding portion 21 coincides with the central axis of the glass tube body 11a. The coil heat dissipation structure 24 includes a plurality of heat dissipation grooves 241 provided on the head 22, and the plurality of heat dissipation grooves 241 are distributed around a cylindrical surface 242, and the central axis of the cylindrical surface 242 coincides with the central axis of the glass tube body 11a.

The coil skeleton 2 and the coil 3 are covered by the shell 4. The main body of the reed lead-out pin 13 is a conductive cylinder. The two reed lead-out pins 13 passing through the two ends of the coil skeleton 2 are both provided with a flat portion 131. The flat portion 131 can be set to be parallel or perpendicular to the contact plane of the reed 12 contact so as to identify the contact plane direction of the reed 12 contact. The coil skeleton 2 is formed by injection molding using the flat portion 131 for positioning.

As shown in FIG. 17 , after the two reed lead pins 13 passing through the two ends of the coil frame 2 are bent 90° in the horizontal direction, the flat portion 131 is perpendicular to the contact plane of the reed 12 .

As shown in Figure 18, after the two tongue reed lead pins 13 pass through the housing 4, they are bent 90° in the longitudinal direction for the second time and then connected to the PCB circuit board 20. The flat portion 131 of the tongue reed lead pin 13 is used to position the contact plane of the tongue reed 12 perpendicular to the PCB circuit board 20.

In the fourth embodiment, the housing 4 is formed by positioning the flat portion 131 and then injection-molding the coil skeleton 2 and the coil 3. The flat portion 131 is located in the housing 4 and combined with the housing 4. The flat portion 131 includes two parallel planes, which are perpendicular to the contact plane of the tongue reed 12 contact and can also be set to be parallel; the distance between the two parallel planes is smaller than the diameter of the main body of the tongue reed lead pin 13, and the two parallel planes form an angle 132 at the connection with the main body of the tongue reed lead pin 13. In this way, the pit formed by the parallel planes and the angle 132 is filled with plastic, and the plastic acts as a positioning pin, which can effectively prevent the tongue reed lead pin 13 from rotating in the circumferential direction, and avoid the tongue reed lead pin 13 from rotating under the action of external force during the bending process, thereby destroying the sealing of the reed switch. Secondly, the angle 132 is conducive to the separation of the mold insert and the part, and avoids the deformation caused by pulling the part during demolding. In the fourth embodiment, the two parallel planes of the flat portion 131 are parallel to the PCB circuit board 20. As a variation, the two parallel planes of the flat portion 131 may also be arranged to be perpendicular to the PCB circuit board 20 .

The housing 4 is provided with four limiting protrusions 45 at the bottom. When the reed relay 10 is mounted on the PCB 20, the four limiting protrusions 45 limit the distance between the bottom of the housing 4 and the upper end surface of the PCB 20, so as to facilitate heat dissipation when the reed relay 10 is working and facilitate plug-in connection between the reed relay 10 and the PCB 20.

In this embodiment, the coil frame 2 and the shell 4 are made of the same material. The shell 4 is also provided with a shell heat dissipation structure 41 at both ends.

When the reed relay 10 of this embodiment is working, the contact surface of the reed 12 contacts the PCB circuit board. The 20 phases are perpendicular, which can improve the impact resistance of the contacts of the reed relay 10 and prevent false operation.

Embodiment 5

As shown in FIG. 19 , the fifth embodiment of the reed relay disclosed in the present invention is different from the fourth embodiment in that the flat portion 131 is located outside the housing 4. After the reed lead pin 13 of the reed relay 10 is connected to the PCB circuit board 20, the flat portion 131 abuts against the upper end of the PCB circuit board 20 to limit the distance between the bottom of the housing 4 and the PCB circuit board 20. At the same time, the two coil lead pins 23 are also provided with a flat portion 231 correspondingly and abut against the upper end of the PCB circuit board 20. In this fifth embodiment, the bottom of the housing 4 does not need to be provided with a limiting convex portion.

Embodiment 6

As shown in Figures 20 and 21, the sixth embodiment of the reed relay disclosed in the present invention is different from the fourth embodiment in that the flat portion 131 is outside the housing 4, and the reed lead pin 13 of the reed relay 10 is formed by affixing the flat portion 131 to the upper end of the PCB circuit board 20 to form an electrical connection. At this time, the two coil lead pins 23 are also provided with a corresponding flat portion 231 and affixed to the upper end of the PCB circuit board 20 to form an electrical connection, which is convenient for fitting installation. In this sixth embodiment, the bottom of the housing 4 does not need to be provided with a limiting protrusion.

Embodiment 7

As shown in FIG. 22 , the seventh embodiment of the reed relay disclosed in the present invention is different from the fourth embodiment in that: the two reed lead pins 13 passing through the two ends of the coil skeleton 2 are each provided with two flat portions 131, one flat portion 131 on each reed lead pin 13 is inside the housing 4 and combined with the housing 4, and the other flat portion 131 is outside the housing 4. After the reed lead pins 13 of the reed relay 10 are connected to the PCB circuit board 20, the flat portion 131 outside the housing 4 presses against the upper end of the PCB circuit board 20 to limit the distance between the bottom of the housing 4 and the PCB circuit board 20, and at the same time, the two coil lead pins 23 are also provided with corresponding flat portions 231 and press against the upper end of the PCB circuit board 20. In this seventh embodiment, there is no need to set a limiting convex portion at the bottom of the housing 4.

Embodiment 8

As shown in FIG. 23 , the eighth embodiment of the reed relay disclosed in the present invention is different from the fourth embodiment in that: the two reed lead pins 13 passing through the two ends of the coil skeleton 2 are both provided with two flat portions 131, one flat portion 131 on each reed lead pin 13 is inside the housing 4 and combined with the housing 4, and the other flat portion 131 is outside the housing 4. The reed lead pins 13 of the reed relay 10 are formed by the flat portion 131 outside the housing 4 being attached to the upper end of the PCB circuit board 20 to form an electrical connection. At this time, the two coil lead pins 23 are also provided with corresponding flat portions 231 and attached to the upper end of the PCB circuit board 20 to form an electrical connection, which is convenient for fitting installation. In this eighth embodiment, there is no need to set a limiting protrusion at the bottom of the housing 4.

It should be understood that the present disclosure does not limit its application to the detailed structure and arrangement of the components proposed in this specification. The present disclosure can have other embodiments and can be implemented and executed in a variety of ways. The aforementioned variations and modifications fall within the scope of the present disclosure. It should be understood that the present disclosure disclosed and defined in this specification extends to all alternative combinations of two or more individual features mentioned or evident in the text and/or the drawings. All these different combinations constitute multiple alternative aspects of the present disclosure. The embodiments described in this specification illustrate the best mode known for implementing the present disclosure and will enable those skilled in the art to utilize the present disclosure.

Claims

A reed relay comprises a reed switch and a coil frame, wherein the reed switch comprises a glass tube, wherein the glass tube comprises a cylindrical glass tube body, wherein sintered sections are respectively arranged at both ends of the glass tube body, wherein two tongue reeds which can contact or separate from each other are arranged in the glass tube body, wherein the tongue reed lead pins of the two tongue reeds respectively pass through the two sintered sections, and wherein the coil frame is formed by injection molding and covers the entire glass tube, wherein the coil frame comprises a middle cylindrical winding portion and two heads connected to the two ends of the winding portion, wherein one end of the two tongue reed lead pins respectively passes through the middle position of the end faces of the two heads; wherein each of the sintered sections is partially or completely located in one of the heads, wherein a section of each tongue reed lead pin is covered and fixed by one of the heads, and wherein each of the heads is provided with a coil heat dissipation structure near the sintered sections.
The reed relay according to claim 1 is characterized in that the two reed lead pins respectively pass through the two sintered sections along the central axis of the glass tube body.
The reed relay according to claim 1 is characterized in that the head of the coil skeleton coincides with the central axis of the winding portion.
The reed relay according to claim 1 is characterized in that the central axis of the cylindrical winding portion coincides with the central axis of the glass tube body.
The reed relay according to claim 1 is characterized in that: the coil heat dissipation structure includes a plurality of heat dissipation grooves arranged on opposite end surfaces of the two heads, and the plurality of heat dissipation grooves are distributed around a cylindrical surface, and the central axis of the cylindrical surface coincides with the central axis of the glass tube body.
The reed relay according to claim 5 is characterized in that: the head also has a plurality of side surfaces connected to the end surface, and one end of each of the heat dissipation grooves extends to the side surface of the head, and the other end is located on the cylindrical surface.
The reed relay according to claim 1 is characterized in that: a coil lead pin is provided on the upper part of each of the heads, and one end of the two coil lead pins is electrically connected to the two ends of the enameled wire of the coil respectively.
The reed relay according to claim 7 is characterized in that: the two heads are respectively provided with positioning grooves, the two positioning grooves are located on the same side of the winding part, and the other end of each coil lead-out pin is bent and partially located in the positioning groove.
The reed relay according to claim 7 is characterized in that: each of the heads is provided with a wire passing groove near one end of the coil lead-out pin; and at least one of the heads is provided with a winding clamping groove.
The reed relay according to claim 1 is characterized in that: the cross-sectional profile shape of each of the heads along the direction perpendicular to the central axis of the glass tube body includes a first rectangle and a second rectangle arranged in the middle of the upper surface of the first rectangle, wherein the size of the second rectangle in the direction perpendicular to the central axis of the glass tube body is smaller than the size of the first rectangle.
The reed relay according to claim 1 is characterized in that each of the reed lead-out pins passing through the head is cylindrical, and a flat portion is processed in the middle part of each reed lead-out pin passing through the head, and the flat portion is parallel or perpendicular to the contact surface of the contact of the reed.
The reed relay according to any one of claims 1 to 11, characterized in that the injection molding process portion is arranged on one of the two head portions and is located in a middle position of an end surface away from the winding portion.