A lead-out sheet with positioning function
By designing a lead-out piece with a positioning function, the problems of increased parts and wear in existing electromagnetic relays are solved, achieving structural simplification, cost reduction, and improved insulation performance, while preventing secondary connection and the accumulation of splashes.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- ZHANGZHOU HONGFA ELECTROACOUSTIC CO LTD
- Filing Date
- 2023-05-05
- Publication Date
- 2026-06-09
AI Technical Summary
In existing electromagnetic relays, adding positioning plates or forearm limiting structures increases the number of parts and complexity, leading to high production costs, easy wear, and affecting insulation performance.
Design a lead-out piece with positioning function, including first and second connected parts. The flat segment is close to the moving spring, with a slot in the middle. The two arms are inclined and the slot makes room for the contact rod. The end of the flat segment is close to the back of the contact cap to absorb the energy of the moving spring and reduce the accumulation of splashes.
It simplifies the structure, reduces costs, improves insulation performance and reliability, prevents secondary connection caused by the spring rebound, and reduces the accumulation of metal spatter.
Smart Images
Figure CN116705556B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of electromagnetic relays, and more specifically to improvements in the moving spring lead-out piece therein. Background Technology
[0002] An electromagnetic relay generally includes a base, a housing, a magnetic circuit, a moving spring, and a stationary spring. The magnetic circuit includes a coil frame, enameled wire, an iron core, a yoke, and an armature. The moving spring includes a moving spring contact and a moving spring lead-out piece with both QC and PCB leads. The stationary spring includes contacts and a stationary spring piece with both QC and PCB leads. Both the moving and stationary springs are mounted on the base, which has a cavity to isolate the magnetic circuit from the contact system.
[0003] The existing technical solution involves adding a locating plate to absorb the energy released by the moving spring, thus preventing secondary contact from occurring. This solution increases the number of parts in the product and inevitably adds assembly steps, thereby increasing production costs. Adding a single part also requires additional internal space, increasing the size of the relay.
[0004] Another existing technical solution involves designing a corresponding forearm limiting structure directly on the lead-out piece. This feature extends to the rear of the contact rod through an elongated bending process. This solution makes the lead-out piece structure more complex, requiring additional bending steps in the mold, increasing the difficulty of mold or tooling manufacturing and thus raising costs. Furthermore, since the lead-out forearm directly contacts the contact rod, repeated contact actions will cause wear on both the contact rod and the lead-out forearm. Prolonged operation can lead to deformation and skew of the forearm, reducing the positional accuracy of the buffer. Moreover, repeated contact collisions generate more metal spatter, reducing the product's insulation performance. Summary of the Invention
[0005] To address the aforementioned problems, this invention provides a lead-out piece with positioning function.
[0006] This invention is implemented using the following scheme:
[0007] This invention proposes a lead-out piece with a positioning function. The lead-out piece includes a first part and a second part connected together. The first part is used for electrical connection with a movable spring. The end of the first part facing the second part is defined as the upper end, and the end away from the second part is defined as the lower end. The first part has a flat segment. The first part is configured such that after the lead-out piece and the movable spring are assembled, the flat segment can be close to the movable spring, and the flat segment and the movable contact of the movable spring have an overlapping portion in the height direction.
[0008] In one embodiment, a slot is provided in the middle of the lead-out piece, the slot spanning the first part and the second part of the lead-out piece.
[0009] In one embodiment, the slot is narrower at the top and wider at the bottom.
[0010] In one embodiment, the moving contact includes a contact cap and a contact rod, the contact cap being riveted to the moving spring via the contact rod, and the slot accommodating the position of the contact rod.
[0011] In one embodiment, the lower part of the slot is a width-gradient portion, and the upper part of the slot is a rectangular portion, which is connected to the width-gradient portion; the width of the rectangular portion is less than the diameter of the contact cap and greater than the diameter of the contact rod after riveting, and the width of the rectangular portion is kept as small as possible.
[0012] In one embodiment, the movable spring is provided with two movable spring grooves, and the movable spring forms two movable spring push arms through the two movable spring grooves; the lead-out piece forms two arms at the position of the width gradient section, the two arms are respectively inclined to the left and right, and the inclination of the two arms is sufficient to place a part of the two arms exactly at the movable spring groove opened on the movable spring, without contacting the movable spring.
[0013] In one embodiment, the flat segment forms two vertical segments at the rectangular portion, and the vertical segments are respectively connected to the upper ends of the two side arms; the vertical segments are positioned behind the spring at the location of the contact cap.
[0014] In one embodiment, the moving spring lead-out sheet further includes a third part, with the second part connected between the first part and the third part, and the whole formed by the first part, the second part and the third part is bent in a "Z" shape.
[0015] In one embodiment, the upper end of the flat segment is not lower than the center of the moving contact of the moving spring.
[0016] In one embodiment, the slot is formed by punching.
[0017] In one embodiment, the lower end of the first portion can be electrically connected to the moving spring via riveting.
[0018] The present invention also proposes an electromagnetic relay with a positioning lead-out piece.
[0019] The technical solution provided by this invention has the following technical effects:
[0020] 1. The flat section of the moving spring lead-out piece extends to both sides of the moving spring contact position. The entire flat section fits tightly against the moving spring, and the bent end fits tightly against the two moving spring sections directly behind the contact cap. This absorbs the energy released by the moving spring and prevents secondary connection caused by the spring's rebound. The design of the moving spring lead-out piece with its flat extension fitting tightly against the moving spring is simple in structure and serves a positioning function, while also solving the problem of misalignment and wear in existing positioning piece designs. Furthermore, this design reduces the input of parts and the product assembly process, lowering product costs.
[0021] 2. A groove is punched in the middle of the lead-out piece, with the groove being narrower at the top and wider at the bottom. The two arms of the lead-out piece are set to the left and right respectively, so that part of the flat piece is placed exactly at the groove of the moving spring piece, without contacting the moving spring piece. This can reduce the accumulation of splashes generated during the test between the moving spring piece and the lead-out piece. Attached Figure Description
[0022] Figure 1 This is an assembly drawing for an electromagnetic relay.
[0023] Figure 2a This is a side view of the movable spring lead-out plate. Figure 2b This is a front view of the movable spring lead-out plate;
[0024] Figure 3a This is a front view of the movable spring and its lead-out piece after assembly. Figure 3b This is a side view of the movable spring and its lead-out piece after assembly.
[0025] Figure 4 for Figure 3b Enlarged view of point A in the middle;
[0026] Figure 5 This is a rear view of the movable spring and its lead-out piece after assembly.
[0027] Figure 6 This is a schematic diagram showing a larger slotted space in the present invention; Detailed Implementation
[0028] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention, primarily used to illustrate the embodiments and to explain the operating principles of the embodiments in conjunction with the relevant descriptions in the specification. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.
[0029] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.
[0030] See Figure 1-5This embodiment provides an electromagnetic relay with a positioning lead-out piece. The electromagnetic relay includes a contact system 100, a magnetic circuit system 200, a base 300, and a push card 400. The contact system 100 includes a stationary spring portion 110 and a movable spring portion 120, which are inserted and fixed on the base 300. The movable spring portion 120 includes a movable spring plate 130 and a movable spring lead-out piece 140 with a positioning function. The movable spring lead-out piece 140 is provided with a lead-out terminal. The movable spring plate 130 is provided with a movable contact 131, which includes a contact cap 132 and a contact rod 133. The contact cap 132 is riveted to the movable spring plate 130 through the contact rod 133. The stationary spring portion 110 includes a stationary contact and a stationary spring plate with a lead-out terminal. The lead-out terminals of the movable spring portion 120 and the stationary spring portion 110 are used to connect to the external circuit to be controlled. The magnetic circuit system 200 includes a coil 230 formed by enameled wire wound on a wire frame 240. The coil 230 is sleeved on a structure composed of an iron core 220 and a yoke 250, forming a magnetic circuit with the armature 210. The magnetic circuit system 200 is installed in the cavity of the base 300. The armature 210 is connected to a pusher 400, which can abut against the movable spring 130.
[0031] When the electromagnetic relay closes, the coil 230 is energized, generating a magnetic force in the magnetic circuit. The armature 210 is attracted by the magnetic force, which pushes the pusher 400 to move towards the moving spring 130. The movement of the pusher 400 causes the moving spring 130 to undergo elastic deformation, thereby bringing the moving contact 131 on the moving spring 130 into contact with the stationary contact on the stationary spring, thus completing the circuit. When the electromagnetic relay opens, the coil 230 is de-energized, the magnetic force in the magnetic circuit is no longer generated, the armature 210 is released, and the moving spring 130 is no longer pushed by the pusher 400. The moving spring 130 is released and swings back, causing the moving contact 131 on the moving spring 130 to separate from the stationary contact on the stationary spring, thus breaking the circuit.
[0032] Preferred options, please refer to Figure 5 To facilitate the deformation of the movable spring 130 and thus the closing action of the electromagnetic relay, two movable spring grooves 134 are provided on the movable spring 130, forming two movable spring push arms 135 via the two movable spring grooves 134. The pusher 400 can abut against the movable spring push arms 135 to push the movable spring 130 to deform. However, the structure of the pusher 400 and the movable spring 130 can not be limited to the above form. For example, the pusher 400 can abut against and push the middle of the movable spring 130.
[0033] See Figure 1 , Figure 2a as well as Figure 2bThe movable spring lead-out piece 140 is bent in a "Z" shape, comprising a first part 141, a second part 142, and a third part 143 connected together, with the second part 142 located between the first part 141 and the third part 143; the third part 143 of the movable spring lead-out piece 140 can be used as a lead-out terminal. The "Z"-shaped bend formed by the first part 141, the second part 142, and the third part 143 of the movable spring lead-out piece 140 allows for a larger electrical clearance between the lead-out terminals of the movable spring portion 120 and the stationary spring portion 110, thereby improving circuit safety; furthermore, the bend where the second part 142 connects to the third part 143 can serve as a force-bearing support point for fixing the movable spring lead-out piece 140 to the base 300 (see [reference]). Figure 1 As shown in the figure, the bend can abut against the protruding rib on the upper side of the base 300, further stabilizing the moving spring lead-out piece 140. This helps the moving spring lead-out piece 140 maintain reliability after multiple actions, making the fixing of the moving spring lead-out piece 140 more secure. The angle of the "Z"-shaped bend and the length of each part can also be adjusted according to the specific position of the lead-out terminal, and no special restrictions are imposed here.
[0034] See Figure 1 -3, define the end of the first part 141 facing the second part 142 as the upper end, and the end away from the second part 142 as the lower end; the lower end of the first part 141 forms a long and thin pin downward, which can serve as a lead-out terminal in another direction of the moving spring lead-out piece 140.
[0035] See Figure 2a , Figure 2b , Figure 3a as well as Figure 3b The first part 141 has a flat segment 148, and the movable spring 130 is riveted to the flat segment 148 of the movable spring lead-out piece 140, thereby realizing the electrical connection between the movable spring 130 and the movable spring lead-out piece 140. However, those skilled in the art will know that the connection between the movable spring 130 and the movable spring lead-out piece 140 is not limited to riveting. Any connection method that provides sufficient mechanical connection strength between the movable spring 130 and the movable spring lead-out piece 140 and enables electrical connection can realize this embodiment, such as welding.
[0036] After the movable spring 130 is connected to the flat segment 148 of the movable spring lead-out piece 140 by riveting or other connection methods, the entire movable spring 130 and the flat segment 148 are tightly fitted together. Optionally, the flat segment 148 is located at the upper end of the first part 141, or the entire first part 141 is set as the flat segment 148. When the entire first part 141 is the flat segment 148, since the entire movable spring 130 and the flat segment 148 are tightly fitted together, both the entire movable spring 130 and the entire flat segment 148 can serve as fixed clamping parts. Therefore, there is more operating space during the connection process. Furthermore, since both the entire movable spring 130 and the entire flat segment 148 can serve as fixed clamping parts, the clamping of the components is more stable during the connection operation, which is more conducive to achieving the connection between the two.
[0037] See Figure 2a , Figure 2b , Figure 3a as well as Figure 3b The movable spring lead-out piece 140 has a slot 144 in the middle, which spans the first part 141 and the second part 142 of the movable spring lead-out piece 140. The slot 144 spanning the first part 141 and the second part 142 of the movable spring lead-out piece 140 facilitates the falling of metal spatters onto the base through the slot 144, reducing the probability of metal spatters getting stuck between the movable spring piece 130 and the movable spring lead-out piece 140.
[0038] The slot 144 makes way for the contact rod 133. The slot 144 can be formed by any suitable processing method, including but not limited to punching, wire cutting, and laser cutting. The upper part of the slot 144 is rectangular, and the width gradually increases at the bottom, resulting in a slot 144 that is narrower at the top and wider at the bottom. Compared to an arrangement where the width of the slot 144 remains constant, this embodiment provides a larger slotting space, such as... Figure 6 As indicated by the arrow, this design makes it easier for metal splatter to fall onto the base through slot 144.
[0039] It should be noted that the top of the slot 144 may have a process notch 145 on each of the left and right positions based on process requirements. The setting of the process notch 145 is only to adapt to the bending process of the moving spring lead-out piece 140, and should not be regarded as making an actual impact or change on the shape and size of the slot 144.
[0040] The rectangular slot width of slot 144 is smaller than the diameter of the contact cap 132 on the moving spring 130, but larger than the diameter of the contact rod 133 on the moving spring 130 after riveting, and the width of the rectangular slot is kept as small as possible. This allows slot 144 to accommodate the contact rod 133 while ensuring that the moving spring lead-out piece 140 has a large enough area behind the contact cap 132 to improve the kinetic energy absorption effect described below. In particular, when the width of the rectangular portion of slot 144 in this embodiment is approximately equal to the outer diameter of the contact rod 133, the slot 144 and the contact rod 133 can assist in installation and positioning when the moving spring 130 and the moving spring lead-out piece 140 are installed flat.
[0041] Optionally, the moving contact 131 can be attached to one side of the moving spring 130 in other ways known to those skilled in the art, without forming a protrusion on the other side of the moving spring 130, so that a slot for avoidance may not be formed on the moving spring lead-out piece 140. Such other methods include welding, integral molding, etc.
[0042] See Figure 2a , Figure 2b , Figure 3a , Figure 3b as well as Figure 4 The spring lead-out piece 140 forms two side arms 146 at the lower part of the slot 144 where the width gradually widens. The flat segment 148 forms two vertical segments 147 in the rectangular portion, and the vertical segments 147 are respectively connected to the upper ends of the two side arms 146; the vertical segments 147 are positioned directly behind the spring piece at the location of the contact cap 132, as shown below. Figure 4 As shown. See also Figure 3a , Figure 3b , Figure 4 as well as Figure 5The movable spring 130 is riveted to the flat segment 148 of the movable spring lead-out piece 140, and the flat segment 148 fits tightly against the movable spring 130. The flat segment 148 of the movable spring lead-out piece 140 bends away from the spring after contacting the spring piece directly behind the contact cap 132. That is, the flat segment 148 extends to both sides of the movable contact 131 position of the movable spring 130, and the end of the flat segment 148 is close to the two movable spring pieces 130 directly behind the contact cap 132. Therefore, when the electromagnetic relay disconnects, the kinetic energy at the contact end is at its maximum during the release and swinging process of the moving spring 130. Since the end of the flat segment 148 is pressed against the two moving springs 130 directly behind the contact cap 132, i.e., the vertical segment 147 is positioned directly behind the spring at the location of the contact cap 132, and since the flat segment 148 overlaps with the moving contact 131 of the moving spring 130 in the height direction, preferably, the upper end of the flat segment 148 is not lower than the center of the moving contact 131 of the moving spring 130. Thus, the vertical segment 147 can absorb and buffer the kinetic energy at the contact end to the maximum extent, and the energy absorption effect is best at this position, thereby preventing the rebound of the moving spring 130 from causing the electromagnetic relay to reconnect. Because the flat segment 148 fits tightly against the entire moving spring 130, there is no problem of reduced limiting accuracy due to wear at the limiting point.
[0043] See Figure 2a , Figure 2b as well as Figure 5 The two arms 146 are tilted to the left and right respectively, and the tilt of the two arms 146 is sufficient to ensure that a portion of the two arms 146 is positioned precisely at the moving spring groove 134 of the moving spring 130 without contacting the moving spring 130. With the area of the two arms 146 remaining constant, the tilt of the two arms 146 results in a larger area of the two arms 146 within the moving spring groove 134. This arrangement reduces the overlap area between the two arms 146 and the moving spring 130, meaning there is a larger offset space between the flat segment 148 of the moving spring lead-out piece 140 and the moving spring 130. Furthermore, see... Figure 6 In this embodiment, the slot width at both arms 146 gradually increases from top to bottom. Compared to a vertical arrangement of both arms 146, this embodiment provides a larger slot space, such as... Figure 6As indicated by the arrow. During the use of the electromagnetic relay, there is a certain probability that the moving contact 131 will reach high temperatures. At the moment the electromagnetic relay is turned on or off, the high temperature will cause spatter to fly out from the moving contact 131. The spatter normally falls vertically. Because there is a larger misalignment space between the flat segment 148 of the moving spring lead 140 and the moving spring 130, and the moving spring lead 140 has a larger slot space, if spatter gets stuck at the higher part of the contact area between the moving spring 130 and the moving spring lead 140, after the relay is activated again, the spatter will fall to the bottom at the misalignment position between the flat segment 148 and the moving spring 130 or at the slot position of the moving spring lead 140, thus allowing the spatter to slide off onto the base 300. This configuration in this embodiment can minimize the accumulation of spatter between the moving spring 130 and the moving spring lead 140 during use.
[0044] The positioning spring lead-out piece 140 proposed in this embodiment is applicable to all electromagnetic relays, including AC, DC, monostable, and magnetic latching types of electromagnetic relays.
[0045] Furthermore, although the above embodiments are illustrated using a moving spring lead plate applied in an electromagnetic relay as an example, since the moving spring lead plate has the function of preventing the moving spring from rebounding and causing secondary connection, it can also be used as an electrode lead plate in other switching devices, such as jog switches.
[0046] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.
Claims
1. A lead-out piece with a positioning function, the lead-out piece comprising a first part and a second part connected together, the first part being used for electrical connection with a movable spring, the end of the first part facing the second part being defined as the upper end, and the end away from the second part being defined as the lower end, the first part having a flat segment, the first part being configured such that: after the lead-out piece and the movable spring are assembled, the flat segment can be tightly attached to the movable spring, and the flat segment and the movable contact of the movable spring have an overlapping portion in the height direction; the movable spring is provided with a movable spring groove, the lead-out piece is provided with a slot in the middle, the lower part of the slot is a width-gradient portion, the lead-out piece forms two side arms at the width-gradient portion, the two side arms are respectively inclined to the left and right, and the inclination of the two side arms is sufficient such that a portion of the two side arms is placed exactly at the movable spring groove on the movable spring, without contacting the movable spring.
2. The lead-out sheet according to claim 1, characterized in that: The slot spans the first and second portions of the lead-out piece.
3. The lead-out sheet according to claim 2, characterized in that: The slot is narrower at the top and wider at the bottom.
4. The lead-out sheet according to claim 3, characterized in that: The moving contact includes a contact cap and a contact rod. The contact cap is riveted to the moving spring via the contact rod, and the slot makes room for the position of the contact rod.
5. The lead-out sheet according to claim 3, characterized in that: The upper part of the slot is a rectangular portion, which is connected to the width gradient portion; the width of the rectangular portion is less than the diameter of the contact cap and greater than the diameter of the contact rod after riveting, and the width of the rectangular portion is kept as small as possible.
6. The lead-out sheet according to claim 5, characterized in that: The movable spring sheet is provided with two movable spring grooves, and the movable spring sheet forms two movable spring push arms through the two movable spring grooves.
7. The lead-out sheet according to claim 6, characterized in that: The flat segment forms two vertical segments at the rectangular portion, and the vertical segments are respectively connected to the upper ends of the two side arms; the vertical segments are limited behind the spring at the location of the contact cap.
8. The lead-out sheet according to claim 7, characterized in that: The moving spring lead-out plate also includes a third part, with the second part connected between the first and third parts. The whole formed by the first, second and third parts is bent in a "Z" shape.
9. The lead-out sheet according to claim 8, characterized in that: The upper end of the flat segment is not lower than the center of the moving contact of the moving spring.
10. The lead-out sheet according to any one of claims 2-9, characterized in that: The slot is formed by punching.
11. The lead-out sheet according to any one of claims 1-9, characterized in that: The lower end of the first part can be electrically connected to the moving spring by riveting.
12. An electromagnetic relay with a positioning function lead-out piece, wherein the lead-out piece is the lead-out piece according to any one of claims 1-11.