reed relay

Abstract

The reed relay includes a reed switch (1) and a coil bobbin (2). The reed switch (1) includes a glass tube (11). The glass tube (11) includes a glass tube body (11a) and two sintered sections (11b). Two tongue spring pieces (12) are provided inside the glass tube body (11a). Two tongue spring piece pull-out pins (13) are drilled out from the two sintered sections (11b), respectively. The coil bobbin (2) is injection molded to cover the entire glass tube (11) and has a cylindrical shape. The reed relay includes a winding portion (21) and two head portions (22) connected to both ends of the winding portion (21), one end of each of two tongue spring piece extraction pins (13) protrudes from the two head portions (22), part or all of the sintered section (11b) is located within the head portions (22), part of the tongue spring piece extraction pin (13) is covered and fixed by the head portions (22), and each head portion (22) is provided with a coil heat dissipation structure (24) at a position close to the sintered section (11b). Reed relays have relatively good initial sealing properties and insulation properties.

Description

[Technical Field]

[0001] [Cross-reference by correlated applications] This disclosure claims priority to Chinese Patent Applications Nos. 202211197883.0, 202211197856.3, and 202211201243.2, filed on September 29, 2022, the entire contents of which are incorporated herein by reference.

[0002] The present disclosure relates to the field of reed relay manufacturing techniques, and more particularly to reed relays. [Background technology]

[0003] Reed relays are derived products based on reed switch technology. Reed switches use a special sealing structure (sealed sintering of the glass tube) and sealing process (filling the glass tube with an inert gas or vacuum treatment) to prevent the reed switch's spring from being contaminated or corroded by the external atmospheric environment, resulting in unparalleled contact reliability and excellent insulation performance. Reed relays are widely recognized and used in fields requiring high insulation and contact reliability, such as instrument testing, network communications, new energy insulation detection, and medical electronics.

[0004] A conventional reed relay typically includes a reed switch, a coil bobbin, a coil, and a housing. During the manufacturing process, the coil bobbin is typically manufactured first, and then the reed switch glass tube is attached to the bobbin's center hole and secured in place by adhesive injection. This method of securing the reed switch glass tube and the coil bobbin is prone to damaging the reed switch glass tube, affecting the initial sealing performance of the reed switch glass tube and making automated production unfeasible. Second, the potting process can easily cause separation of low-molecular-weight substances, degrading the reed switch's insulating performance, forming voids within the adhesive, and causing the adhesive to bulge, affecting the connection quality between the reed switch and the coil bobbin and its insulating performance after connection. Furthermore, with the above-described method of fixing the glass tube of the reed switch to the coil bobbin, it is difficult to position the glass tube of the reed switch in the middle of the center hole of the coil bobbin, and it is difficult to align the center of the contact part of the tongue spring piece of the reed switch (the position where the air gap is largest) with the center of the window of the coil bobbin (the position where the magnetic flux of the coil is most concentrated), making it impossible to further improve electrical performance. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a reed relay that ensures the initial sealing performance of the glass tube of a reed switch and has good insulation performance.

[0006] In order to achieve the above object, the reed relay of the present invention includes a reed switch including a glass tube having a cylindrical glass tube body, and a coil bobbin. The glass tube body is provided with sintered sections at both ends, and two tongue spring pieces that can contact or separate from each other are provided inside the glass tube body. The tongue spring piece pull-out pins of the two tongue spring pieces protrude from the two sintered sections respectively. The coil bobbin is injection molded to cover the entire glass tube, and the coil bobbin includes a cylindrical winding section in the middle and two head sections connected to both ends of the winding section. One end of the two tongue spring piece pull-out pins protrudes from a middle position on the end surface of the two head sections. Part or all of each of the sintered sections is located within one head section, and a part of each tongue spring piece pull-out pin is covered and fixed by one of the head sections. Each of the head sections is provided with a coil heat dissipation structure located close to the sintered section. According to one embodiment of the present disclosure, the two tongue spring piece pull-out pins are drilled out from the two sintered sections respectively along the central axis of the glass tube body.

[0007] According to one embodiment of the present disclosure, the head portion of the coil bobbin is aligned with the central axis of the winding portion, which is advantageous for achieving alignment between the center of the contact portion of the tongue spring piece of the reed switch (where the air gap is largest) and the center of the opening of the coil bobbin (where the magnetic flux of the coil is most concentrated), thereby not only making full use of the magnetic flux of the coil, but also improving the consistency of electrical parameters and further improving electrical performance.

[0008] According to one embodiment of the present disclosure, the central axis of the cylindrical winding portion overlaps with the central axis of the glass tube body.

[0009] According to one embodiment of the present disclosure, the coil heat dissipation structure includes a plurality of heat dissipation grooves installed on opposite end surfaces of the two head portions, the plurality of heat dissipation grooves being distributed around a cylindrical surface, and the central axis of the cylindrical surface overlaps with the central axis of the glass tube body. According to one embodiment of the present disclosure, the head portion further has a plurality of side surfaces connected to the end surface, and each of the heat dissipation grooves has one end extending to the side surface of the head portion and the other end located on the cylindrical surface.

[0010] According to one embodiment of the present disclosure, one coil pull-out pin penetrates the upper portion of each of the head portions, and one end of each of the two coil pull-out pins is electrically connected to both ends of the enameled wire of the coil, respectively.

[0011] According to one embodiment of the present disclosure, each of the two head portions is provided with a positioning groove, the two positioning grooves are located on the same side of the winding portion, and the other end of each of the coil pull-out pins is partially located within the positioning groove after being bent.

[0012] According to one embodiment of the present disclosure, each of the head portions is provided with a wire passing groove at a position close to one end of the coil pull-out pin, and at least one of the head portions is provided with a winding clamping groove.

[0013] The wire passing groove can prevent the lead wire from moving over the head portion of the coil bobbin and breaking, and the wire passing groove can also play a role in protecting the lead wire. The winding clamping groove makes it easy to position the winding on the coil bobbin.

[0014] According to one embodiment of the present disclosure, the cross-sectional contour shape of each of the head portions along a direction perpendicular to the central axis of the glass tube body includes a first rectangle and a second rectangle located in the middle of the upper surface of the first rectangle, and the dimension of the second rectangle in the direction perpendicular to the central axis of the glass tube body is smaller than the dimension of the first rectangle. According to one embodiment of the present disclosure, each of the tongue spring piece extraction pins protruding from the head portion is cylindrical, and a flat portion is provided at the middle portion of each of the tongue spring piece extraction pins protruding from the head portion, and the flat portion is parallel to or perpendicular to the contact surface of the contact of the tongue spring piece.

[0015] The flat portion in the middle of the tongue spring piece extraction pin allows the tongue spring piece extraction pin to be more firmly connected to the housing, and the orientation of the contact surface of the tongue spring piece's contact can be more easily identified, facilitating the setting of the operating direction of the contact surface of the contact, improving operational reliability and interference resistance. Furthermore, when forming the coil bobbin by injection molding, the flat portion can be used for positioning, and facilitating the assembly and processing of the housing in subsequent processes.

[0016] According to one embodiment of the present disclosure, one of the two heads includes an injection molding process section located midway between the end face of the head and the winding section. During injection, the plastic flows along the axial and radial directions of the glass tube. Using a single injection port to inject the plastic laterally reduces the injection molding pressure and the abrasion force of the plastic against the glass tube. At the same time, the plastic in the sintering section flows approximately radially. This maximizes the matching of the expansion of the plastic and the expansion of the glass (the expansion of the plastic in the flow direction is smaller than the expansion in the vertical direction and closer to the expansion of the glass). This ensures that the plastic flow directions in the sintering sections at both ends are consistent, better protecting the glass tube of the reed switch and improving the yield of injection-molded coil bobbins.

[0017] The present disclosure has the following beneficial effects:

[0018] 1. The glass tube of the reed switch is covered with plastic, forming an overall rigid connection with the plastic, which prevents the glass tube from being disturbed by external vibration and the risk of poor sealing caused by cracks in the glass tube or damage to the bonding interface of the sintered section due to disturbance. This ensures the initial sealing performance of the glass tube of the reed switch and is better suited to applications with high requirements for vibration resistance.

[0019] 2. A portion of the tongue spring pull-out pin of the reed switch is covered and fixed by the head of the coil bobbin, and part or all of each of the sintered sections is located within a single head. This not only prevents the clamping position of the tongue spring pull-out pin from being too close to the sintered section of the glass tube, which would cause deformation stress to be directly transmitted to the base of the sintered section of the glass tube during injection molding of the coil bobbin, resulting in poor sealing, but also ensures that the plastic covering has a certain strength. This prevents the sintered section of the glass tube from being damaged by mechanical stress transmitted to the base of the sintered section of the glass tube when the tongue spring pull-out pin is reprocessed after injection molding of the coil bobbin, thereby improving the structural strength of the entire reed switch.

[0020] 3. Each head is provided with a coil heat dissipation structure located close to the sintering section, which reduces the impact of plastic, glass, and metal not expanding synchronously and avoids the impact on the sealing of the glass tube caused by extrusion due to uneven thermal stress. At the same time, the coil heat dissipation structure increases the creepage distance of the reed relay and, as a heat dissipation groove with a weight-reducing effect, reduces the impact on the sealing of the glass tube caused by bending deformation of the coil bobbin due to centrifugal force caused by high-speed rotation when the coil is wound around the coil bobbin.

[0021] 4. Reed relays do not require sealing by injecting adhesive, so low molecular weight substances that can reduce insulation performance do not separate after connection, improving the insulation performance of the reed relay.

[0022] 5. The coil bobbin is injection molded to cover the entire glass tube, which is advantageous for automated production. In addition, since the glass tube is distributed in the middle of the coil bobbin, the consistency of its electrical parameters and electrical performance can be further improved. [Brief explanation of the drawings]

[0023] The above and other features and advantages of the present disclosure will become more apparent from the detailed description of illustrative embodiments thereof, which proceeds with reference to the accompanying drawings. [Figure 1] FIG. 1 is a perspective view of a reed switch according to the related art. [Figure 2] FIG. 2 is a schematic diagram of the structure of the reed switch of FIG. [Figure 3] FIG. 3 is a perspective view of a reed relay according to the first embodiment of the present disclosure. [Figure 4] FIG. 4 is a top view of FIG. [Figure 5] FIG. 5 is a cross-sectional view taken along line AA in FIG. [Figure 6] FIG. 6 is a schematic diagram showing the injection molding process section and the direction of plastic flow during injection molding of a coil bobbin. [Figure 7] FIG. 7 is a perspective view of a reed relay according to the second embodiment of the present disclosure. [Figure 8] FIG. 8 is a top view of FIG. [Figure 9] FIG. 9 is a cross-sectional view taken along line BB in FIG. [Figure 10] FIG. 10 is a perspective view of a reed switch connected to a coil bobbin according to the second embodiment of the present disclosure. [Figure 11] FIG. 11 is a schematic diagram showing a connection state with a PCB according to the second embodiment of the present disclosure. [Figure 12] FIG. 12 is a perspective view of a reed relay according to a third embodiment of the present disclosure. [Figure 13] FIG. 13 is a schematic diagram showing a connection state with a PCB according to the third embodiment of the present disclosure. [Figure 14] FIG. 14 is a perspective view of a reed relay according to a fourth embodiment of the present disclosure. [Figure 15] FIG. 15 is a top view of FIG. [Figure 16] FIG. 16 is a cross-sectional view taken along line CC in FIG. [Figure 17]FIG. 17 is a perspective view of a reed switch connected to a coil bobbin according to a fourth embodiment of the present disclosure. [Figure 18] FIG. 18 is a schematic diagram of a reed relay connected to a PCB according to a fourth embodiment of the present disclosure. [Figure 19] FIG. 19 is a schematic diagram of a reed relay connected to a PCB according to a fifth embodiment of the present disclosure. [Figure 20] FIG. 20 is a schematic diagram of a reed relay connected to a PCB according to a sixth embodiment of the present disclosure. [Figure 21] FIG. 21 is a perspective view of a reed relay according to the sixth embodiment of the present disclosure. [Figure 22] FIG. 22 is a schematic diagram of a reed relay connected to a PCB according to a seventh embodiment of the present disclosure. [Figure 23] FIG. 23 is a schematic diagram of a reed relay connected to a PCB according to an eighth embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0024] Exemplary embodiments will now be described more comprehensively with reference to the accompanying drawings. However, exemplary embodiments may be embodied in various forms and should not be construed as limited to the embodiments described herein. Although relative terms such as "above" and "below" are used herein to describe the relative relationship of one marked component to another, these terms are used herein for convenience only, for example, according to the orientation of the examples depicted in the drawings. It will be understood that if the marked device is turned upside down, the component described as being "above" would become the component described as being "below." Other relative terms such as "top" and "bottom" have similar meanings. When a structure is "above" another structure, it can mean that the structure is integrally formed on the other structure, that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via another structure.

[0025] The terms "a," "an," "the," and "said" are used to indicate the presence of one or more elements / components / etc. The terms "comprise" and "have" are used in an open inclusive sense to indicate that additional elements / components / analogs may be present beyond the listed elements / components / analogs. Terms such as "first" and "second" are used merely as markers and do not limit the number of items referred to.

[0026] Embodiment 1 As shown in FIGS. 1 and 2, the reed switch 1 includes a glass tube 11. The glass tube 11 includes a cylindrical glass tube body 11a. Sintered sections 11b are provided at both ends of the glass tube body 11a. Two tongue spring pieces 12 are provided within the glass tube body 11a and can be connected or separated from each other. Two tongue spring piece pull-out pins 13 extend from the two sintered sections 11b along the central axis of the glass tube body 11a, respectively. The glass tube 11 is filled with an inert gas or is under vacuum. The connection sections 12a of the tongue spring pieces 12 connected to the tongue spring piece pull-out pins 13 have a flat structure. The two connection sections 12a can be bent or tilted relative to the central axis of the glass tube body 11a. The contacts of the two tongue spring pieces 12 face each other and are spaced apart, allowing the contacts of the two tongue spring pieces 12 to come into contact and separate, thereby achieving a switching function.

[0027] 3 to 5, in the reed relay according to the first embodiment of the present disclosure, the coil bobbin 2 is injection-molded and covers the entire glass tube 11. The coil bobbin 2 includes a cylindrical winding portion 21 and two head portions 22 connected to both ends of the winding portion 21. The length of the cylindrical winding portion 21 is slightly longer than the length of the glass tube main body 11a. One end of each of the two tongue spring piece extraction pins 13 protrudes from the middle of the end faces of the two head portions 22. A portion of each of the sintered sections 11b is located within one head portion 22, but the entirety of each of the sintered sections 11b may also be located within one head portion 22. A portion of each tongue spring piece extraction pin 13 is covered and fixed by one head portion 22. Each of the head portions 22 is provided with a coil heat dissipation structure 24 in a position adjacent to the sintered section 11b. The head portion 22 has an outer end surface facing away from the winding portion 21 and a plurality of side surfaces connected to the outer end surface, and the two outer end surfaces of the two head portions 22 are installed opposite each other.

[0028] 3 and 5, the central axis of the cylindrical winding portion 21 overlaps with the central axis of the glass tube body 11a. The coil heat dissipation structure 24 includes a plurality of heat dissipation grooves 241 on the outer end surface of 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 overlaps with the central axis of the glass tube body 11a. One end of each heat dissipation groove 241 extends to the side surface of the head portion 22, and the other end is located on the cylindrical surface 242.

[0029] One coil pull-out pin 23 penetrates the top of each head portion 22, and one end 40 of each of the two coil pull-out pins 23 is electrically connected to both ends of the enameled wire of the coil. The two head portions 22 are provided with positioning grooves 221, and the two positioning grooves 221 of the two head portions 22 are located on the same side of the winding portion 21. The other end of each coil lead-out pin 23 is partially positioned within the positioning groove 221 after being bent.

[0030] Each head portion 22 is provided with a wire passing groove 222 at a position close to one end 40 of the coil pull-out pin 23. The wire passing groove 222 may be U-shaped, V-shaped, or arc-shaped. The wire passing groove 222 makes it easy to wind the end of the enameled wire of the coil around one end 40 of the coil pull-out pin 23. At least one head portion 22 is provided with a winding clamping groove 223 for clamping and positioning the coil bobbin 2 and winding the wire to form a coil.

[0031] The cross-sectional contour shape of each head portion 22 along a direction perpendicular to the central axis of the glass tube body 11a includes a first rectangle and a second rectangle located in the center of the upper surface of the first rectangle, and the dimension of the second rectangle in the direction perpendicular to the central axis of the glass tube body 11a is smaller than the dimension of the first rectangle.

[0032] The tongue spring piece drawing pins 13 are cylindrical, and a flat portion 131 is provided in the middle of each tongue spring piece drawing pin 13 protruding from the head portion 22, and the flat portion 131 is parallel to the contact surface of the contactor of the tongue spring piece 12, or the flat portion 131 may be set perpendicular to the contact surface of the contactor of the tongue spring piece 12, in either case it is possible to better identify the direction of the contact surface of the contactor of the tongue spring piece 12. Meanwhile, when the coil bobbin 2 is formed by injection molding, the flat portion 131 can be used for positioning, which facilitates assembly and processing of the housing in subsequent processes.

[0033] Since the central axis of the glass tube 11 overlaps with the central axis of the coil bobbin 2, it is advantageous to make the center of the contact part of the tongue spring piece 12 (where the air gap is largest) overlap with the window center of the coil bobbin 2 (where the magnetic flux of the coil is most concentrated), which not only makes the most of the magnetic flux of the coil, but also improves the consistency of the electrical parameters and further improves the electrical performance.

[0034] 5 and 6, an injection molding process portion 2a, such as an injection molding process port or an injection molding process protrusion, is formed on the coil bobbin 2. The injection molding process portion 2a is formed when the coil bobbin 2 is injection molded onto the outside of the glass tube 11, and corresponds to the injection port of an injection mold.

[0035] As shown in Figure 6, the injection molding process unit 2a is provided on one of the two head units 22 and is located at the midpoint of the end face of the head unit 22 away from the winding unit 21, and when plastic is injected, the plastic flows in the axial and radial directions of the glass tube 11 (directions indicated by the arrows in Figure 6).

[0036] When the coil bobbin 2 is injection molded, the plastic is injected laterally from one injection port, which reduces the injection molding pressure and the abrasion force of the plastic against the glass tube 11. At the same time, the plastic in the sintered section 11b flows in an approximately radial direction, ensuring that the expansion of the plastic and the expansion of the glass are matched to the maximum extent possible (the expansion amount of the plastic in the flow direction is smaller than that in the vertical flow direction and is closer to the expansion amount of the glass). The flow directions of the plastic in the sintered sections 11b at both ends are consistent, which can better protect the glass tube 11 of the reed switch 1.

[0037] Furthermore, conventional reed relays typically include a reed switch, a coil bobbin, a coil, and a housing. Because the reed switch is the core component of the reed relay, a manufacturing challenge lies in ensuring the initial sealing performance of the reed switch. The housing of a conventional reed relay is primarily sealed by potting, in which the reed switch is first assembled with the coil and coil bobbin into a magnetic circuit system, and then the magnetic circuit system is placed in the housing and sealed by potting. This potting-sealing structure has drawbacks, such as the tendency for low-molecular-weight substances to separate, degrading the insulating performance of the reed switch, forming voids inside the plastic, and easily swelling the outer surface of the plastic, thereby reducing the overall quality of the reed relay. Furthermore, the potting-sealing structure makes it difficult to center the magnetic circuit system within the housing, which also affects the overall quality of the reed relay.

[0038] The present invention further provides a reed relay that has excellent insulation performance and ensures the initial sealing performance of the reed switch, thereby improving the quality of the reed relay.

[0039] According to one aspect of the present invention, a reed relay includes a reed switch, a coil bobbin, a coil, and a housing. The reed switch includes a glass tube, which includes a cylindrical glass tube body with sintered sections at both ends. Two tongue spring pieces that can contact or be separated from each other are provided inside the glass tube body, and the tongue spring piece pull-out pins of the two tongue spring pieces protrude from the two sintered sections along the central axis of the glass tube body. The glass tube is fixedly installed in the middle of a coil bobbin, and one end of each of the two tongue spring piece pull-out pins protrudes from a position midway between both ends of the coil bobbin. A coil is wound around the coil bobbin. The housing is injection molded to cover the coil bobbin and the coil. Both of the two tongue spring piece pull-out pins protrude partially from the housing. The housing is provided with a housing heat dissipation structure at both ends close to the coil bobbin.

[0040] According to one embodiment of the present disclosure, the coil bobbin is installed in the middle of the housing, and each of the housing heat dissipation structures includes a plurality of heat dissipation grooves installed at one end of the housing, and the plurality of heat dissipation grooves are installed symmetrically above and below with respect to a horizontal plane passing through the central axis of the glass tube body.

[0041] According to one embodiment of the present disclosure, a coil bobbin is injection-molded to cover the entire glass tube. The coil bobbin includes a cylindrical winding section in the middle and two head sections connected to both ends of the winding section. Two tongue spring piece pull-out pins extend from the middle of the end faces of the two head sections along the central axis of the winding section. A coil is wound around the winding section, and part or all of each of the sintered sections is located in one of the head sections. The glass tube is located in the middle of the coil bobbin. Each head section has a coil pull-out pin, one end of which is electrically connected to both ends of the enameled wire of the coil, and the other end of each of the two coil pull-out pins extends from the housing.

[0042] In this way, the glass tube of the reed switch is covered with plastic, forming a strong overall connection with the plastic, preventing the glass tube from being disturbed by external vibrations, and avoiding the risk of poor sealing caused by cracks in the glass tube or destruction of the bonding interface of the sintered section due to disturbances, ensuring the initial sealing performance of the glass tube of the reed switch, and effectively improving the vibration-proof performance.

[0043] In addition, the glass tube is located in the middle of the coil bobbin, which advantageously allows the center of the contact part of the tongue spring piece of the reed switch (where the air gap is largest) to overlap with the center of the window of the coil bobbin (where the magnetic flux of the coil is most concentrated). This not only makes full use of the magnetic flux of the coil, but also improves the consistency of the electrical parameters, further improving the electrical performance.

[0044] According to one embodiment of the present invention, each of the two head portions is provided with a positioning groove, the two positioning grooves are located on the same side of the winding portion, and each coil pull-out pin is partially positioned within the positioning groove after being bent.

[0045] The coil extractor pin is restrained in the length and height directions by the positioning groove, which prevents the coil extractor pin from being distorted and unable to be inserted into the mold cavity before the housing is injection molded, and prevents the coil extractor pin from being deformed due to rubbing of the plastic during the housing injection molding.

[0046] According to one embodiment of the present invention, the housing is provided with two pairs of limit grooves, each pair of limit grooves being adjacent to two of the head portions, and each pair of limit grooves being installed on both sides of the housing.

[0047] The coil bobbin is restrained by the limit groove in the width direction of the housing, ensuring that the coil bobbin is positioned midway within the housing, ultimately achieving uniformity and symmetry of the housing's expansion in all directions.

[0048] According to one embodiment of the present invention, two coil pull-out pins and two tongue spring piece pull-out pins protruding from the housing are respectively installed on both sides of the housing, and each coil pull-out pin protruding outside the housing is adjacent to one side of the heat dissipation structure of the housing, and each tongue spring piece pull-out pin protruding outside the housing is adjacent to the other side of the heat dissipation structure of the housing.

[0049] In this way, the housing heat dissipation structure can increase the creepage distance between the tongue spring piece pull-out pin and the coil pull-out pin, thereby improving electrical performance.

[0050] According to one embodiment of the present invention, the material properties of the coil bobbin are the same as the material properties of the housing.

[0051] According to one embodiment of the present invention, the body of the tongue spring piece extraction pin is cylindrical, and each tongue spring piece extraction pin protruding from the center position of the end face of the head portion of the coil bobbin is bent horizontally by 90 degrees to form a first bent section, and a flat portion is provided in the first bent section, and the flat portion is perpendicular or parallel to the contact surface of the contact of the tongue spring piece, and the coil bobbin is first formed by injection molding after positioning using the flat portion, and then the housing is formed by positioning using the flat portion or by injection molding after positioning using the coil bobbin, and the flat portion is covered by the housing.

[0052] This allows the tongue spring piece extraction pin and the housing to be more firmly connected and the direction of the contact surface of the tongue spring piece contactor to be more clearly identified, making it easier to determine the installation direction of the reed relay and ensuring the maximum operational performance of the reed relay.

[0053] According to one embodiment of the present invention, the flat portion includes two parallel surfaces, which are parallel or perpendicular to the contact surfaces of the contacts of the tongue spring piece, the distance between the two parallel surfaces is smaller than the diameter of the body of the tongue spring piece extraction pin, and an oblique angle is formed at the junction between the two parallel surfaces and the body of the tongue spring piece extraction pin.

[0054] The recess formed by the parallel plane and the bevel is filled with plastic, which acts as a positioning pin and effectively prevents the tongue spring piece pull-out pin from rotating in the circumferential direction, preventing the tongue spring piece pull-out pin from rotating due to external force during the bending process, which could destroy the sealing of the reed switch. Furthermore, the bevel is advantageous for separating the mold insert from the part, preventing deformation of the part due to tension during demolding.

[0055] According to one embodiment of the present invention, a portion of the first bent portion protruding from the housing is bent again vertically at 90 degrees to form a second bent portion. When the reed relay is mounted on a PCB (printed circuit board), the second bent portion is inserted into or tightly attached to the PCB, and the contact surface of the tongue spring contact is perpendicular to the PCB. This improves the vibration resistance and shock resistance of the reed relay and prevents malfunction.

[0056] According to an embodiment of the present invention, each of the head portions is provided with a coil heat dissipation structure in a position close to the sintering section.

[0057] Each head section is provided with a coil heat dissipation structure located close to the sintering section, which reduces the effect of plastic, glass, and metal not being able to expand synchronously and avoids the impact on the initial sealing of the glass tube due to extrusion caused by uneven thermal stress.

[0058] According to one embodiment of the present invention, the central axis of the cylindrical winding portion overlaps with the central axis of the glass tube body, and the coil heat dissipation structure includes a plurality of heat dissipation grooves arranged in the head portion, the plurality of heat dissipation grooves being distributed around a cylindrical surface, and the central axis of the cylindrical surface overlaps with the central axis of the glass tube body.

[0059] According to one embodiment of the present disclosure, a plurality of limit protrusions are provided on the bottom of the housing, and when the reed relay is mounted on a PCB, the plurality of limit protrusions advantageously limit the distance between the bottom of the housing and the PCB, ensuring sufficient heat dissipation space when the reed relay is activated.

[0060] The present invention has the following beneficial effects:

[0061] 1. The housing is injection molded to cover the coil bobbin and coil, with two coil pull-out pins and two tongue spring pull-out pins protruding from the housing. The housing is equipped with a housing heat dissipation structure at both ends close to the coil bobbin. The housing heat dissipation structure improves the thermal conductivity of the plastic, increasing the heat exchange area between the plastic and the air during use and the contact area between the plastic and the mold during the injection molding process, thereby enhancing the thermal conduction / heat dissipation effect. This synchronizes the thermal conduction between "metal-glass" and "plastic-glass" and prevents excessive temperature gradients around the sintered section of the glass tube before thermal equilibrium, which increases the expansion difference between the different materials and causes thermal stress on adjacent materials. This prevents the glass tube from being damaged by extrusion or tensile stress, ensures the initial sealing of the reed switch, and improves the quality of the reed relay.

[0062] 2. Improved insulation performance between input and output. By molding the housing and coil bobbin together, defects such as the separation of low-molecular-weight substances due to potting, deterioration of insulation performance, and the tendency for internal cavities and adhesive surface bulges can be avoided, improving insulation performance and improving the quality of the reed relay. Furthermore, the heat dissipation structure increases the creepage distance between the tongue spring pull-out pin and the coil pull-out pin, improving electrical performance.

[0063] 3. The assembly precision of the coil bobbin within the housing has been improved, which more reliably ensures that the bobbin is positioned in the middle of the housing. This makes the housing's plastic wall thickness uniform and symmetrical in all directions, thereby maximizing the uniformity and symmetry of expansion.

[0064] Embodiment 2 As shown in FIGS. 1 and 2, the reed switch 1 includes a glass tube 11, which includes a cylindrical glass tube body 11a. Sintered sections 11b are provided at both ends of the glass tube body 11a. Two tongue spring pieces 12 are provided within the glass tube body 11a, and these pieces can be brought into contact with or separated from each other. Two tongue spring piece pull-out pins 13 extend from the two sintered sections 11b along the central axis of the glass tube body 11a, respectively. The glass tube 11 is filled with an inert gas or is under a vacuum. The connecting sections 12a connecting the tongue spring pieces 12 and the tongue spring piece pull-out pins 13 have 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. The contacts of the two tongue spring pieces 12 face each other at a distance, allowing the contacts to be brought into contact or separated, thereby achieving a switching function.

[0065] 9 and 10, a reed relay according to a second embodiment of the present disclosure includes a reed switch 1, a coil bobbin 2, a coil 3, and a housing 4. The glass tube 11 is fixedly installed in the middle of the coil bobbin 2, and two tongue spring piece pull-out pins 13 protrude from the middle positions at both ends of the coil bobbin 2. The coil 3 is wound around the coil bobbin 2, and two coil pull-out pins 23 are fixedly installed on the coil bobbin 2 at a distance from each other, and the two coil pull-out pins 23 are wound around both ends of the enameled wire of the coil 3 and electrically connected to each other.

[0066] 7 to 9, the housing 4 is injection molded to cover the coil bobbin 2 and the coil 3, the coil bobbin 2 is disposed in the middle of the housing 4, and two coil pull-out pins 23 and two tongue spring piece pull-out pins 13 all partially protrude from the housing 4. The housing 4 is provided with housing heat dissipation structures 41 at both ends close to the coil bobbin 2. Each housing heat dissipation structure 41 includes a plurality of heat dissipation grooves 411 disposed at one end of the housing 4, and the plurality of heat dissipation grooves 411 are disposed symmetrically above and below with respect to a horizontal plane passing through the central axis of the glass tube body 11a.

[0067] 9 and 10, the coil bobbin 2 is injection-molded to cover the entire glass tube. The coil bobbin 2 includes a cylindrical winding portion 21 and two head portions 22 connected to both ends of the winding portion 21. Two tongue spring piece pull-out pins 13 protrude from the centers of the two head portions 22 along the central axis of the winding portion 21. The coil 3 is wound around the winding portion 21, and each of the sintered portions 11b may be partially or entirely located within the head portion 22. The glass tube 11 is disposed in the middle of the coil bobbin 2; that is, the central axis of the glass tube body 11a overlaps with the central axis of the coil bobbin 2. Each head portion 22 is provided with one coil pull-out pin 23, and one end of each of the two coil pull-out pins 23 is wound around both ends of the enameled wire of the coil 3 and electrically connected.

[0068] 10, each of the two head portions 22 is provided with a positioning groove 221, and the two positioning grooves 221 are located on the same side of the winding portion 21. After being bent, each coil pull-out pin 23 is partially positioned within the positioning groove 221. The opening of the positioning groove 221 is provided with a chamfer 221a, which allows plastic to easily flow in during injection molding of the housing 4.

[0069] 12, the housing 4 is provided with two pairs of limit grooves 43, each pair being adjacent to one of the two head portions, and each pair of limit grooves 43 is located on both sides of the housing 4. The coil bobbin 2 is constrained in the width direction of the housing 4 by the limit grooves 43 on both sides of the housing 4, ensuring that the coil bobbin 2 is distributed centrally within the housing 4, thereby achieving uniformity and symmetry in the expansion of the housing 4 in all directions.

[0070] 11, the two coil pull-out pins 23 and two tongue spring piece pull-out pins 13 protruding from the housing 4 are located on both sides of the housing 4, with each coil pull-out pin 23 protruding from the housing 4 being close to the housing heat dissipation structure 41 and installed on one side of the housing heat dissipation structure 41, and each tongue spring piece pull-out pin 13 protruding from the housing 4 being close to the housing heat dissipation structure 41 and installed on the other side of the housing heat dissipation structure 41. In this way, the creepage distance between the coil pull-out pins 23 and the tongue spring piece pull-out pins 13 can be increased.

[0071] 10, each head 22 is provided with a coil heat dissipation structure 24 located adjacent to the sintering section 11b. The central axis of the cylindrical winding part 21 overlaps 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 arranged on the head 22, which are distributed around a cylindrical surface 242, and the central axis of the cylindrical surface 242 overlaps with the central axis of the glass tube body 11a.

[0072] 10, the tongue spring piece drawing pin 13 protruding from the middle of the head portion 22 of the coil bobbin 2 is bent horizontally by 90 degrees to form a first bent section 13a, and the first bent section 13a is provided with a flat portion 131, which may be perpendicular to or parallel to the contact surface of the contact of the tongue spring piece 12. Then, the flat portion 131 is first positioned and injection molded to form the coil bobbin 2, and then the flat portion 131 is used to position the coil bobbin 2 or the coil bobbin 2 is used to position the coil bobbin 2 and injection molded to form the housing 4, with the flat portion 131 covered by the housing 4.

[0073] 10 and 11, the flat portion 131 includes two parallel planes, which are perpendicular to the contact surface of the contact of the tongue spring piece 12, and which may be parallel to the contact surface of the contact of the tongue spring piece 12. The distance between the two parallel planes is smaller than the diameter of the body of the tongue spring piece pull-out pin 13, and an oblique angle 132 is formed at the junction between the two parallel planes and the body of the tongue spring piece pull-out pin 13. Resin fills the recess formed by the parallel planes and the oblique angle 132, which functions as a positioning pin, effectively preventing circumferential rotation of the tongue spring piece pull-out pin 13. This prevents external force from rotating the tongue spring piece pull-out pin 13 during the bending process, thereby preventing the sealing performance of the reed switch 1 from being damaged. Furthermore, the oblique angle 132 facilitates separation of the mold insert from the part, preventing deformation of the part due to pulling during demolding.

[0074] The material properties of the injection molding of the coil bobbin 2 are the same as the material properties of the injection molding of the housing 4 .

[0075] 11 , a portion of the first bent section 13a protruding from the housing 4 is bent again 90° in the vertical direction to form a second bent section 13b. When the reed relay of this embodiment is mounted on a PCB 10, the second bent section 13b is inserted into the PCB 10, and the contact surfaces of the contacts of the tongue spring pieces 12 are perpendicular to the PCB 10. This structure facilitates plug-in installation between the PCB 10 and this embodiment, effectively improves the vibration and shock resistance of this embodiment, and prevents malfunctions. To facilitate plug-in installation on the PCB 10, two coil lead-out pins 23 protruding from the housing 4 are bent 90° in the vertical direction to form plug-in sections 23a, which are inserted into the PCB 10.

[0076] In this embodiment, the two parallel faces of the flat portion 131 are parallel to the PCB 10. Alternatively, the two parallel faces of the flat portion 131 may be perpendicular to the PCB 10. The bottom of the housing 4 is provided with four limit protrusions 45 , which limit the distance between the bottom of the housing 4 and the PCB 10 when the reed relay is attached to the PCB 10 .

[0077] Embodiment 3 12 to 14 , the structure of the reed relay according to the third embodiment of the present disclosure differs from the first embodiment in that the lower end of the second bent section 13b is bent again horizontally by 90 degrees to form a flat contact portion 131b. When attaching the reed relay according to this embodiment to a PCB 10, the flat contact portion 131b at the lower end of the second bent section 13b is brought into close contact with the PCB 10, facilitating close installation. In this case, the lower ends of the insertion sections 23a of the two coil lead-out pins 23 are also bent again horizontally by 90 degrees to form a second flat contact portion 231a, which is brought into close contact with the PCB 10. This embodiment facilitates close installation with the PCB 10.

[0078] A conventional reed relay typically includes a reed switch, a coil bobbin, a coil, and a housing. The reed switch includes a glass tube with two spring tongues inside and two spring tongue pull-out pins protruding from both ends of the glass tube. The coil is wound around the coil bobbin, and the glass tube is fixedly connected to the middle of the coil bobbin. The housing covers the coil bobbin and coil and is sealed with potting. Two spring tongue pull-out pins and two coil pull-out pins protrude from the housing. Most reed relays must be mounted on a printed circuit board (PCB) to function, which is achieved by attaching them to the PCB via two spring tongue pull-out pins and two coil pull-out pins. However, because the spring tongue pull-out pins of the reed switch and the glass tube of the reed switch are cylindrical, when the reed switch is fixedly connected to the middle of the coil bobbin, the circumferential position of the reed switch becomes random, making it difficult to position and set, i.e., the position of the spring tongue contacts becomes random. When a reed relay is mounted on a PCB, the flat surface of the tongue spring contact is parallel to the PCB, which weakens the shock and vibration resistance of the tongue spring contact. This can cause malfunctions, affecting the operational reliability of the reed relay and reducing its shock resistance.

[0079] The present invention further provides a reed relay that can improve the shock resistance of the contacts of the reed relay and prevent malfunction of the reed relay.

[0080] According to one aspect of the present invention, a reed relay includes a reed switch, a coil bobbin, a coil, and a housing. The reed switch includes a glass tube, which includes a cylindrical glass tube body with sintered sections at both ends. Two tongue spring pieces that can contact or be separated from each other are provided inside the glass tube body, and tongue spring piece pull-out pins of the two tongue spring pieces protrude from the two sintered sections. The glass tube is fixedly connected to the middle of the coil bobbin. One ends of the two tongue spring piece pull-out pins protrude from two ends of the coil bobbin. A coil is wound around the coil bobbin, and the coil bobbin and the coil are covered by the housing. The tongue spring piece pull-out pin body is a conductive cylindrical body, and at least one tongue spring piece pull-out pin protruding from both ends of the coil bobbin has a flat portion that is parallel or perpendicular to the contact surface of the tongue spring piece's contact. The two tongue spring pull-out pins are drilled out of the housing and then connected to the PCB. The flat parts of the tongue spring pull-out pins position the contact surfaces of the tongue spring contacts perpendicular to the PCB.

[0081] According to one embodiment of the present disclosure, the housing is positioned by the flat portion and then injection molded to cover the coil bobbin and the coil, thereby improving the bonding strength and insulating performance.

[0082] According to one embodiment of the present disclosure, the flat portion is disposed inside the housing and is coupled to the housing, and the flat portion is covered by the plastic housing, which prevents the tongue spring piece extracting pin protruding from the housing from rotating due to a tangential force in the circumferential direction during post-processing, thereby improving the anti-rotation effect of the tongue spring piece extracting pin and further reducing the risk of external mechanical forces damaging the sealing performance of the sintered section of the glass body.

[0083] According to one embodiment of the present invention, the flat portion is located outside the housing, and after the tongue spring piece pull-out pin is connected to the PCB, the flat portion abuts against the upper end of the PCB to limit the distance between the bottom of the housing and the PCB, or the flat portion tightly fits against the upper end of the PCB to form an electrical connection. In this way, when the flat portion functions as a limiter, the heat dissipation effect of the reed relay can be enhanced, and when the flat portion tightly fits against the upper end of the PCB to form an electrical connection, it is easy to closely mount the reed relay and also achieves a limiting effect.

[0084] According to one embodiment of the present invention, two tongue spring piece pull-out pins protruding from both ends of the coil bobbin each have two flat portions, one flat portion of each tongue spring piece pull-out pin located inside the housing to couple with the housing, and the other flat portion located outside the housing, so that after the tongue spring piece pull-out pin is connected to the PCB, the flat portion located on the outside of the housing abuts against the top of the PCB to limit the distance between the bottom of the housing and the PCB, or the flat portion is tightly attached to the top of the PCB to form an electrical connection. In this way, the two flat portions improve the anti-rotation effect of the tongue spring piece pull-out pin, facilitate close-fitting installation of the reed relay, and also provide a limiting effect. According to one embodiment of the present invention, a plurality of limit protrusions are provided on the bottom of the housing, and when the reed relay is attached to the PCB, the plurality of limit protrusions limit the distance between the bottom of the housing and the upper end surface of the PCB, facilitating heat dissipation from the reed relay during operation.

[0085] According to one embodiment of the present invention, the flat portion includes two parallel planes, which are parallel or perpendicular to the contact surface of the tongue spring contact, the distance between the two parallel planes being smaller than the diameter of the tongue spring extractor body, and an oblique angle is formed where the two parallel planes meet the tongue spring extractor body. The recess formed by the parallel planes and the oblique angle is filled with plastic, which acts as a locating pin and effectively prevents the tongue spring extractor pin from rotating in the circumferential direction, preventing the reed switch from losing its sealing performance due to rotation caused by external forces during processing. The oblique angle facilitates separation of the mold insert from the part and prevents deformation of the part due to tension during demolding.

[0086] According to one embodiment of the present invention, the coil bobbin is injection-molded to cover the entire glass tube. The coil bobbin includes a cylindrical winding section and two head sections connected to both ends of the winding section. Two tongue spring piece pull-out pins protrude from the middle of the end faces of the two head sections along the central axis of the winding section. The coil is wound around the winding section, and each sintered section is partially or entirely located in one of the head sections. One coil pull-out pin is fixedly connected to each head section, and one end of each of the two coil pull-out pins is electrically connected to both ends of the enameled wire of the coil, respectively. The two coil pull-out pins are connected to a PCB after protruding from the housing. This structure improves the interference resistance and crack resistance of the glass tube of the reed switch, ensures the initial sealing performance of the glass tube of the reed switch, and facilitates automated production.

[0087] According to one embodiment of the present disclosure, the flat portion is used for positioning and injection molding to form the coil bobbin, and each of the two head portions is provided with a positioning groove, and the two positioning grooves are installed on the same side of the glass tube body, and each coil pull-out pin is partially positioned in the positioning groove after being bent, which makes it easy for a housing to cover the coil bobbin and coil by injection molding in a subsequent process.

[0088] According to one embodiment of the present disclosure, each head portion is provided with a coil heat dissipation structure located near the sintering section, with the central axis of the tubular winding portion overlapping the central axis of the glass tube body. The coil heat dissipation structure includes a plurality of heat dissipation grooves located on the head portion, which are distributed around the cylindrical surface, with the central axis of the cylindrical surface overlapping the central axis of the glass tube body. The coil heat dissipation structure reduces the impact of the plastic, glass, and metal not expanding synchronously, thereby avoiding the impact of uneven thermal stress on the sealing performance of the glass tube due to extrusion. At the same time, the coil heat dissipation structure increases the creepage distance of the connection structure, thereby reducing the centrifugal force when winding the coil onto the lightweight coil bobbin.

[0089] According to the present invention, at least one tongue spring pull-out pin protruding from each end of the coil bobbin is provided with a flat portion that is parallel or perpendicular to the contact surface of the tongue spring contact, making it easy to identify the orientation of the contact surface of the tongue spring contact. When the two tongue spring pull-out pins protrude from the housing and are connected to the PCB, the contact surface of the tongue spring contact faces the desired direction, and positioning via the flat portion of the tongue spring pull-out pin ensures that the contact surface of the tongue spring contact is perpendicular to the PCB. The contact surface of the tongue spring contact is perpendicular to the PCB, providing the strongest vibration resistance, improving the vibration and shock resistance of the reed relay contacts and effectively preventing reed relay malfunctions.

[0090] In addition, the flat portion also has a rotation prevention function, which can reduce the risk of damaging the sealing of the glass tube due to rotational displacement of the tongue spring piece and the glass sintered section caused by external torque.

[0091] Embodiment 4 As shown in FIGS. 1, 2, and 14 to 18, a reed relay 10 according to a fourth embodiment of the present disclosure includes a reed switch 1, a coil bobbin 2, a coil 3, and a housing 4. The reed switch 1 includes a glass tube 11, which includes a cylindrical glass tube main body 11a. Sintered sections 11b are provided at both ends of the glass tube main body 11a. Two tongue spring pieces 12, which can contact or separate from each other, are provided inside the glass tube main body 11a. Two tongue piece pull-out pins 13 protrude from the two sintered sections 11b, and 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 bobbin 2, and one end of each of the two tongue spring piece pull-out pins 13 protrudes from each end of the coil bobbin 2. Specifically, the reed switch 1 is connected to the coil bobbin 2 so that the coil bobbin 2 is injection-molded to completely cover the glass tube 11. The coil bobbin 2 includes a cylindrical winding portion 21 in the middle and two head portions 22 connected to both ends of the winding portion 21. Two tongue spring piece pull-out pins 13 protrude from the middle of the two head portions 22 along the central axis of the winding portion 21. The glass tube 11 of the reed switch 1 is installed in the middle of the coil bobbin 2, and a coil 3 is wound around the winding portion 21. Each sintered portion 11b is partially located in one head portion 22, but each sintered portion 11b may be entirely located in one head portion 22. One coil pull-out pin 23 is fixedly attached to each head portion 22, and one end of each of the two coil pull-out pins 23 is electrically connected to both ends of the enameled wire of the coil 3. The two coil pull-out pins 23 are connected to the PCB 20 after protruding from the housing 4.

[0092] The two head portions 22 are each provided with a positioning groove 221, and the two positioning grooves 221 are located on the same side of the winding portion 22. Each coil lead-out pin 23 is partially located in the positioning groove 221 after being bent.

[0093] Each head 22 is provided with a coil heat dissipation structure 24 at a position close to the sintering section 11b, with the central axis of the cylindrical winding 21 overlapping the central axis of the glass tube body 11a. The coil heat dissipation structure 24 includes a plurality of heat dissipation grooves 241 arranged on the head 22, which are distributed around a cylindrical surface 242, and the central axis of the cylindrical surface 242 overlaps the central axis of the glass tube body 11a.

[0094] The coil bobbin 2 and coil 3 are covered by the housing 4, and the main body of the tongue spring piece pull-out pin 13 is a conductive cylinder. The two tongue spring piece pull-out pins 13 protruding from both ends of the coil bobbin 2 each have a flat portion 131 that is positioned parallel or perpendicular to the contact surface of the contactor of the tongue spring piece 12, making it easy to identify the direction of the contact surface of the contactor of the tongue spring piece 12. The coil bobbin 2 is injection molded using the flat portion 131 for positioning.

[0095] As shown in Figure 17, the flat portion 131 is perpendicular to the contact surface of the contactor of the tongue spring piece 12 after both of the two tongue spring piece extraction pins 13 protruding from both ends of the coil bobbin 2 are bent horizontally by 90 degrees.

[0096] 18, after the two tongue spring piece pull-out pins 13 protrude from the housing 4, they are both bent again vertically by 90 degrees before being connected to the PCB 20. By positioning via the flat portions 131 of the tongue spring piece pull-out pins 13, the contact surfaces of the contacts of the tongue spring pieces 12 are perpendicular to the PCB 20.

[0097] In embodiment 4, the housing 4 is positioned by the flat portion 131 and then injection-molded to cover the coil bobbin 2 and the coil 3. The flat portion 131 is located inside the housing 4 and is connected to the housing 4. The flat portion 131 includes two parallel planes that are perpendicular to the contact surface of the contact of the tongue spring piece 12 and may be parallel to it. The distance between the two parallel planes is smaller than the diameter of the body of the tongue spring piece pull-out pin 13, and an oblique angle 132 is formed where the two parallel planes join with the body of the tongue spring piece pull-out pin 13. In this way, the recess formed by the parallel planes and the oblique angle 132 is filled with plastic, which functions as a positioning pin and effectively prevents the tongue spring piece pull-out pin 13 from rotating in the circumferential direction. This prevents the tongue spring piece pull-out pin 13 from rotating due to external force during processing, thereby preventing the sealing performance of the reed switch from being damaged. Furthermore, the beveled angle 132 is advantageous for separating the mold insert from the component, and prevents deformation of the component due to tension during demolding. In this embodiment 4, the two parallel planes of the flat portion 131 are parallel to the PCB 20. Alternatively, the two parallel planes of the flat portion 131 may be arranged to be perpendicular to the PCB 20.

[0098] The housing 4 is provided with four limit protrusions 45 on its bottom, which limit the distance between the bottom of the housing 4 and the top surface of the PCB 20 when the reed relay 10 is attached to the PCB 20, facilitating heat dissipation from the reed relay 10 during operation. They also facilitate plug-in connection between the reed relay 10 and the PCB 20.

[0099] In this embodiment, the coil bobbin 2 and the housing 4 are made of the same material during injection molding. Housing heat dissipation structures 41 are also provided on both ends of the housing 4. When the reed relay 10 of this embodiment is operating, the contact surface of the contact of the tongue spring piece 12 is perpendicular to the PCB 20, which improves the shock resistance of the contact of the reed relay 10 and prevents malfunction.

[0100] Embodiment 5 19 , a reed relay according to a fifth embodiment of the present disclosure differs from the fourth embodiment in that the flat portion 131 is located outside the housing 4, and after the tongue spring piece pull-out pin 13 of the reed relay 10 is connected to the PCB 20, the flat portion 131 abuts against the upper end of the PCB 20, limiting the distance between the bottom of the housing 4 and the PCB 20. At the same time, the two coil pull-out pins 23 are also provided with corresponding flat portions 231 that abut against the upper ends of the PCB 20. In the fifth embodiment, there is no need to provide a limiting protrusion on the bottom of the housing 4.

[0101] Embodiment 6 20 and 21, the reed relay according to the sixth embodiment of the present disclosure differs from the fourth embodiment in that the flat portion 131 is located outside the housing 4, and the tongue spring piece pull-out pin 13 of the reed relay 10 is brought into close contact with the upper end of the PCB 20 using the flat portion 131 to form an electrical connection. At this time, the two coil pull-out pins 23 are also provided with corresponding flat portions 231, which are brought into close contact with the upper end of the PCB 20 to form an electrical connection. In the sixth embodiment, there is no need to provide a limit protrusion on the bottom of the housing 4.

[0102] Embodiment 7 22 , a reed relay according to a seventh embodiment of the present disclosure differs from the fourth embodiment in that two tongue spring piece pull-out pins 13 protruding from both ends of the coil bobbin 2 are each provided with two flat portions 131, one flat portion 131 of each tongue spring piece pull-out pin 13 being located inside the housing 4 and coupled with the housing 4, and the other flat portion 131 being located outside the housing 4. After the tongue spring piece pull-out pins 13 of the reed relay 10 are connected to the PCB 20, the flat portion 131 located outside the housing 4 abuts against the upper end of the PCB 20 to limit the distance between the bottom of the housing 4 and the PCB 20. At the same time, two coil pull-out pins 23 are also provided with corresponding flat portions 231 that abut against the upper ends of the PCB 20. In the seventh embodiment, there is no need to provide a limiting protrusion on the bottom of the housing 4.

[0103] Embodiment 8 23 , the reed relay according to the eighth embodiment of the present disclosure differs from the fourth embodiment in that two tongue spring piece pull-out pins 13 protruding from both ends of the coil bobbin 2 each have two flat portions 131. One flat portion 131 of each tongue spring piece pull-out pin 13 is located inside the housing 4 to couple with it, and the other flat portion 131 is located outside the housing 4. The tongue spring piece pull-out pins 13 of the reed relay 10 are tightly attached to the top end of the PCB 20 using the flat portion 131 on the outside of the housing 4 to form an electrical connection. In this case, the two coil pull-out pins 23 also have corresponding flat portions 231 that tightly attach to the top end of the PCB 20 to form an electrical connection, making tight attachment easier. In the eighth embodiment, there is no need to provide a limiting protrusion on the bottom of the housing 4.

[0104] It is to be understood that the present disclosure is not limited in its application to the detailed construction and arrangement of components presented herein. The present disclosure may have other embodiments and may be embodied and carried out in various forms. The foregoing variations and modifications are within the scope of the present disclosure. The present disclosure as disclosed and limited herein should be understood to extend to all alternative combinations of two or more individual features mentioned or apparent in the text and / or drawings. All of these various combinations constitute multiple alternative aspects of the present disclosure. The embodiments described herein detail the best known ways of implementing the present disclosure and will enable those skilled in the art to utilize the present disclosure.

Claims

1. A reed relay, A reed switch including a glass tube having a cylindrical glass tube body, and a coil bobbin, wherein a sintered section is provided at each end of the glass tube body, and two tongue spring pieces that can come into contact with or separate from each other are provided inside the glass tube body, and tongue spring piece pull-out pins of the two tongue spring pieces protrude from the two sintered sections, respectively; The coil bobbin is injection molded to cover the glass tube body, and the coil bobbin includes a cylindrical winding portion in the middle and two head portions connected to both ends of the winding portion, and one end of each of the two tongue spring piece drawing pins protrudes from a middle position of the end faces of the two head portions, A part or the whole of each of the sintering sections is located within one head portion, a part of each of the tongue spring piece extraction pins is covered by and fixed to one of the head portions, and each of the head portions is provided with a coil heat dissipation structure at a position close to the sintering section.

1. A reed relay comprising:

2. The two tongue spring piece pull-out pins are drilled out from the two sintered sections along the central axis of the glass tube body, respectively.

2. The reed relay according to claim 1.

3. The head portion of the coil bobbin overlaps with the central axis of the winding portion.

2. The reed relay according to claim 1.

4. The central axis of the cylindrical winding portion overlaps with the central axis of the glass tube body.

2. The reed relay according to claim 1.

5. The coil heat dissipation structure includes a plurality of heat dissipation grooves disposed on opposite end surfaces of the two heads, the plurality of heat dissipation grooves being distributed around a cylindrical surface, and the central axis of the cylindrical surface being aligned with the central axis of the glass tube body.

2. The reed relay according to claim 1.

6. The head portion further has a plurality of side surfaces connected to the end surface, and each of the heat dissipation grooves has one end extending to the side surface of the head portion and the other end located on the cylindrical surface.

6. A reed relay according to claim 5.

7. One coil pull-out pin penetrates the upper part of each head portion, and one end of each of the two coil pull-out pins is electrically connected to both ends of the enameled wire of the coil.

2. The reed relay according to claim 1.

8. Each of the two head portions is provided with a positioning groove, and the two positioning grooves are located on the same side of the winding portion, and the other end of each of the coil pull-out pins is partially located within the positioning groove after being bent.

8. A reed relay according to claim 7.

9. Each of the head portions is provided with a wire passing groove at a position close to one end of the coil pull-out pin, and at least one of the head portions is provided with a winding clamping groove.

8. A reed relay according to claim 7.

10. The cross-sectional contour shape of each of the head portions along a direction perpendicular to the central axis of the glass tube body includes a first rectangle and a second rectangle located in the middle of the upper surface of the first rectangle, and the dimension of the second rectangle in the direction perpendicular to the central axis of the glass tube body is smaller than the dimension of the first rectangle.

2. The reed relay according to claim 1.

11. Each of the tongue spring piece drawing pins protruding from the head portion is cylindrical, and a flat portion is provided at the middle portion of each of the tongue spring piece drawing pins protruding from the head portion, and the flat portion is parallel or perpendicular to the contact surface of the contact of the tongue spring piece.

2. The reed relay according to claim 1.

12. One of the two head portions is provided with an injection molding process portion located at an intermediate position on an end surface of the head portion away from the winding portion.

12. The reed relay according to claim 1, wherein the reed relay is a reed relay having a first insulating layer and a second insulating layer.

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