An electromagnetic relay

Abstract

The application provides an electromagnetic relay, which comprises a shell, a base assembled in the shell, a magnetic circuit system and a contact system assembled on the base, the contact system comprises at least two spring sheets, the spring sheets each comprise a wiring end inserted into the base and a pin end extending out of the shell, at least one spring sheet has a bending section between the wiring end and the pin end, the bending section is located between the shell and the base, the shell is provided with a glue injection hole corresponding to the bending section, and glue is injected into the shell through the glue injection hole to fixedly connect the shell, the bending section and the base. The application effectively solves the influence of the force on the product parameters during the insertion, guarantees the stability of the mechanical parameters of the relay, and realizes lower product cost.

Description

Technical Field

[0001] This invention relates to the field of relays, and more specifically to an electromagnetic relay. Background Technology

[0002] Electromagnetic relays, especially those with flat quick-connect terminals, feature a one-piece stamped design for the PC pins (i.e., terminals) and QC pins (i.e., lead terminals) on the moving and stationary spring leads. The PC pins are used to connect to the PCB board, while the QC pins, or flat quick-connect pins, are used for quick connection. The relay housing has through holes for the QC pins of the stationary spring and the moving spring to pass through.

[0003] Existing electromagnetic relays with flat quick-connect terminals simply follow the design of relays with only PC pins. A protrusion is provided on the spring near the PC pin to secure it to the base. However, the QC pin design does not consider the impact of QC terminal deformation during actual insertion on the relay's parameters. Therefore, when the relay is inserted into the socket on the customer's board, it is highly likely to cause the relay parameters to be unqualified and premature product failure.

[0004] Another existing technical solution requires a longer spring and more mating structures on the spring to strengthen its fixation with the base. The spring is bent at multiple large angles to shift the stress deformation location, thus avoiding impact on the contact points. This solution not only uses more material but also requires additional bending steps using molds, increasing the difficulty of mold or tooling manufacturing and therefore resulting in higher costs. Summary of the Invention

[0005] Therefore, the present invention provides an electromagnetic relay that uses a new fixing method to fix the spring.

[0006] To achieve the above objectives, the technical solution provided by the present invention is as follows:

[0007] An electromagnetic relay includes a housing, a base mounted inside the housing, and a magnetic circuit system and a contact system mounted on the base. The contact system includes at least two springs. Each spring includes a terminal inserted into the base and a pin extending out of the housing. At least one spring has a bent section between its terminal and pin, the bent section being located between the housing and the base. The housing has an injection hole corresponding to the bent section, through which adhesive is injected into the housing to fix the housing, the bent section, and the base together.

[0008] Furthermore, the base is provided with an abutment boss, and the bent section abuts against the abutment boss.

[0009] Further, the end of the bending section close to the terminal end is defined as the front end, and the end close to the pin end is defined as the rear end; a contact face facing the front end is further formed on the bending section; and a limiting convex column is further arranged on the base and located in front of the contact face and abuts against the contact face of the bending section.

[0010] Further, a hole slot for allowing the contact to deform is arranged on the terminal end of the reed, the hole slot extends to the bending section, and the hole slot is the contact face on the side wall of the bending section; and the limiting convex column is arranged in the hole slot.

[0011] Further, the top end of the limiting convex column further abuts against the inner side wall of the shell.

[0012] Further, the inner side wall of the shell is recessed with a step connected with the glue injection hole, the top end of the limiting convex column abuts against the step and is further exposed in the glue injection hole.

[0013] Further, the step is located at the front end of the glue injection hole.

[0014] Further, the outer surface of the shell is recessed with a glue dispensing groove, a through hole is arranged in the glue dispensing groove, the pin end of the reed passes through the through hole and extends out of the shell; and the glue injection hole is located in the glue dispensing groove.

[0015] Further, the number of the reeds is two, which are a static reed lead-out piece and a dynamic reed lead-out piece, and the dynamic reed lead-out piece has the bending section.

[0016] Further, the bending section of the dynamic reed lead-out piece is arranged horizontally, the pin end of the dynamic reed lead-out piece extends vertically upward, and the terminal end of the dynamic reed lead-out piece extends downward.

[0017] The technical scheme provided by the application has the following beneficial effects:

[0018] 1. The bending section of the reed is assembled between the shell and the base; and then the glue is injected into the glue injection hole to fixedly connect the shell, the bending section and the base; in this way, the pin end can be effectively supported, and the insertion stress of the pin end does not affect the terminal end when the insertion is performed; the influence of the insertion stress on the product parameters during use is effectively solved, the stability of the mechanical parameters of the relay is ensured, and the cost of the present application is lower than that of the prior art.

[0019] 2. The abutting convex column is arranged on the base, and the bending section abuts against the abutting convex column; in this way, the bottom of the bending section can be rigidly supported to bear the pressure when the dynamic reed pin end is inserted, and the downward displacement of the dynamic reed pin end caused by the stress is further limited.

[0020] 3. The bending section is also formed with a front end of the abutting surface, the base is also provided with a limit convex column, the limit convex column is located in front of the abutting surface and abuts on the abutting surface of the bending section. Thus, the limit convex column provides a lateral rigid support for the moving spring lead-out piece, further preventing the moving spring lead from tilting when the force is applied to the end of the moving spring lead, which causes the displacement of the moving spring riveted on the moving spring lead-out piece, resulting in the change of mechanical parameters; further improving the stability.

[0021] 4. The top end of the limit convex column also abuts on the inner side wall surface of the shell. Thus, the limit convex column can support the shell to prevent the shell from deforming with the moving spring lead-out piece due to its thinness. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The figure shows the three-dimensional structure of the electromagnetic relay in the embodiment;

[0023] Figure 2 The figure shows Figure 1 The enlarged schematic view of area A in the embodiment;

[0024] Figure 3 The figure shows the top view of the electromagnetic relay in the embodiment;

[0025] Figure 4 The figure shows Figure 3 The sectional view of line B-B in the embodiment;

[0026] Figure 5 The figure shows Figure 4 The enlarged schematic view of area C in the embodiment;

[0027] Figure 6 The figure shows the assembly of the moving spring lead-out piece and the base in the embodiment Figure 1 ;

[0028] Figure 7 The figure shows the assembly of the moving spring lead-out piece and the base in the embodiment Figure 2 ;

[0029] Figure 8 The figure shows the structure of the base in the embodiment;

[0030] Figure 9 The figure shows the structure of the moving spring lead-out piece in the embodiment;

[0031] Figure 10 The figure shows the structure of the shell in the embodiment Figure 1 ;

[0032] Figure 11 The figure shows the structure of the shell in the embodiment Figure 2 ;

[0033] Figure 12Fig. 1 shows a top view of the housing in the embodiment;

[0034] Figure 13 Fig. 2 shows a sectional view along the line D-D in Fig. 1; Figure 12

[0035] Figure 14 Fig. 3 shows an enlarged schematic view of the area E in Fig. 2. Figure 13 DETAILED DESCRIPTION

[0036] To further illustrate the embodiments, the present application provides accompanying drawings. These drawings are part of the disclosure of the present application, which mainly serve to illustrate the embodiments, and can be used to explain the operating principles of the embodiments in conjunction with the relevant descriptions in the specification. Those of ordinary skill in the art should be able to understand other possible implementations and advantages of the present application in conjunction with these. The components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0037] The present application will be further illustrated in conjunction with the accompanying drawings and specific embodiments.

[0038] Referring to Figures 1 to 14 As shown, the present embodiment provides an electromagnetic relay, specifically, a flat quick-connect terminal electromagnetic relay, which comprises a housing 10, a base 20 assembled in the housing 10, and a magnetic circuit system and a contact system assembled on the base 20. The contact system comprises at least two spring pieces 30. Specifically, the number of spring pieces 30 is two, which are a static spring lead-out piece 32 and a dynamic spring lead-out piece 31. The spring pieces 30 each comprise a wiring end (i.e., PC end) inserted into the base 20 and a pin end (i.e., QC end) extending out of the housing 10. Specifically, the wiring end and the pin end of the static spring lead-out piece 32 are defined as a static spring wiring end and a static spring pin end 322, respectively. The wiring end and the pin end of the dynamic spring lead-out piece 31 are defined as a dynamic spring wiring end 311 and a dynamic spring pin end 312, respectively.

[0039] The dynamic spring wiring end 311 and the dynamic spring pin end 312 of the dynamic spring lead-out piece 31 have a bending section 313 therebetween, which is located between the housing 10 and the base 20. The housing 10 is provided with a glue injection hole 11 corresponding to the bending section 313, and a glue is injected into the housing 10 through the glue injection hole 11 to fixedly connect the housing 10, the bending section 313, and the base 20. In this way, the dynamic spring pin end 312 can be effectively supported, and the insertion stress of the dynamic spring pin end 312 will not affect the dynamic spring wiring end 311 during insertion. This effectively solves the influence of insertion stress on product parameters during use, ensures the stability of mechanical parameters of the relay (especially the flat quick-connect terminal electromagnetic relay), and has a lower cost compared to the method of shifting the stress deformation position by multiple large-angle bending in the prior art. ​​

[0040] Specifically, in the embodiment, the number of the spring pieces 30 is two, which are a static spring leading piece 32 and a dynamic spring leading piece 31 respectively; of course, in other embodiments, the number of the spring pieces 30 is not limited to this, and the number of the spring pieces 30 can be increased according to actual conditions.

[0041] At the same time, the spring piece with the bending section 313 is the dynamic spring leading piece 31, and the static spring leading piece 32 is a vertical plate structure; the setting of the bending section 313 of the dynamic spring leading piece 31 is to keep the dynamic spring pin end 312 and the static spring pin end 322 at a fixed distance for subsequent plug-in; on the other hand, the bending section 313 realizes the fixed connection with the shell 10 and the base 20. Of course, in other embodiments, the static spring leading piece 32 can also be provided with a bending section structure and be fixedly connected with the shell 10 and the base 20 through the bending section.

[0042] Specifically, in the embodiment, as shown in Figure 4 , Figure 6 , Figure 7 and Figure 9 , the bending section 313 of the dynamic spring leading piece 31 is transversely arranged, the pin end (i.e. the dynamic spring pin end 312) of the dynamic spring leading piece 31 is vertically upwardly arranged, and the wiring end (i.e. the dynamic spring wiring end 311) of the dynamic spring leading piece 31 is downwardly arranged, which facilitates assembly and connection. Of course, in other embodiments, the structure of the dynamic spring leading piece 31 is not limited to this.

[0043] Further, in the embodiment, the base 20 is provided with an abutting boss 21, specifically, the abutting boss 21 is integrally protruded from the base 20, which facilitates preparation, such as being integrally formed by mold injection, of course, in other embodiments, the abutting boss 21 can also be an independent structure, which is assembled to the base 20 by existing fixing mode. The bending section 313 abuts on the abutting boss 21. The setting of the abutting boss 21 can rigidly support the bottom of the bending section 313 to bear the pressure received by the dynamic spring pin end 312 when being inserted, and further limits the downward displacement of the dynamic spring pin end 312 caused by force.

[0044] The end of the bending section 313 close to the dynamic spring wiring end 311 is defined as the front end, and the end close to the dynamic spring pin end 312 is defined as the rear end; the front-rear direction is as shown in Figure 4The bending section 313 is further provided with an abutting surface 314 facing the front end. The base 20 is further provided with a limiting protrusion 22 which is integrally protruded from the base 20. The limiting protrusion 22 is located in front of the abutting surface 314 and abuts against the abutting surface 314 of the bending section 313. In this way, the limiting protrusion 22 provides a lateral rigid support for the spring lead-out piece 31, further preventing the spring lead 312 from being displaced forward when subjected to force, which in turn prevents the spring riveted to the spring lead-out piece 32 from being displaced and thus changing the mechanical parameters. The stability is further improved.

[0045] Specifically, the spring lead-out piece 32 is provided with a hole 315 in the spring connecting end 311 for allowing the contact 316 (specifically, the movable contact) to deform. The hole 315 extends to the bending section 313. The side wall of the bending section 313 is the abutting surface 314. The limiting protrusion 22 is arranged in the hole 315. In this way, the original hole 315 structure is fully utilized. The limiting protrusion 22 arranged in the hole 315 has a good limiting effect, preventing the position of the bending section 313 and the limiting protrusion 22 from being deviated. Of course, in other embodiments, the abutting surface 314 can be formed on one side or both sides of the bending section 313.

[0046] Since the shell 10 is thin and weak in strength, the spring lead-out piece 31 is easily deformed when subjected to force, which in turn deforms the shell 10. Therefore, in this embodiment, the top end of the limiting protrusion 22 abuts against the inner side wall of the shell 10. In this way, the limiting protrusion 22 supports the shell 10, preventing the thin shell 10 from being deformed together with the spring lead-out piece 31.

[0047] More specifically, the inner side wall of the shell 31 is recessed with a step 12 which is in communication with the glue injection hole 11. The top end of the limiting protrusion 22 abuts against the step 12 and is exposed in the glue injection hole 11. Another part of the glue injection hole 11 corresponds to the bending section 313. That is, in the top view, the limiting protrusion 22 and the bending section 313 can be observed from the glue injection hole 11. In this way, when injecting glue, the glue is injected from the glue injection hole 11 and can simultaneously fill the gap b between the limiting protrusion 22 and the abutting surface 314, the gap a between the shell 10 and the bending section 313, and the gap between the bending section 313 and the base 20 (specifically, the abutting protrusion). The fixing is more secure. Since the limiting protrusion 22 is higher than the bending section 313, the glue is more easily filled into the gap b between the limiting protrusion 22 and the abutting surface 314, and then filled into the gap between the bending section 313 and the base 20 (specifically, the abutting protrusion) from the gap b. The filling effect is better.

[0048] Further, in the embodiment, the step 12 is located at the front end of the glue injection hole 11. In this way, after the glue is injected, the glue is blocked by the limiting convex column 22, thereby effectively preventing the glue from leaking forward to the inside of the relay.

[0049] Specifically, since the gap b between the limiting convex column 22 and the abutting surface 314, the gap a between the shell 10 and the bent section 313, and the gap between the bent section 313 and the base 20 (specifically, the abutting convex platform) are small, they are closely arranged, and the gaps at other positions are large, such as the gap between the base 20 and the shell 10 at the peripheral position of the bent section 313. Therefore, when dispensing glue, since the amount of glue is fixed, after the glue is injected through the glue injection hole 11, due to the capillary phenomenon of the glue, the glue will preferentially climb to the closely arranged position and stop at the position with a large gap. Therefore, as long as the dispensing amount is controlled, excessive glue will not penetrate to other positions to pollute the inside of the relay.

[0050] The outer surface of the shell 10 is recessed with a dispensing groove 14. Specifically, there are two dispensing grooves 14 corresponding to the static spring lead-out sheet 32 and the dynamic spring lead-out sheet 31. The dispensing groove 14 is provided with a through hole 13. The dynamic spring lead end 312 and the static spring lead end 322 pass through the through hole 13 of the two dispensing grooves 14 to the outside of the shell 10. The glue injection hole 11 communicates with the dispensing groove 14, specifically with the dispensing groove 14 corresponding to the dynamic spring lead-out sheet 31. In this way, as long as glue is dispensed into the dispensing groove 14, the glue can flow into the through hole 13 and the glue injection hole 11 at the same time, that is, through the conventional gap filling operation between the through hole 13 and the dynamic spring lead end 312, the shell 10, the bent section 313, and the base 20 can be fixed at the same time, without the need for additional dispensing operation.

[0051] More specifically, in the embodiment, the wiring end of the spring sheet 30 extending out of the shell 10 is also sealed with the shell 10 by dispensing, which plays a sealing protection role and effectively fixes the wiring end of the spring sheet 30.

[0052] It can be understood that: in the embodiment, the wiring end and the lead end of the spring sheet 30 are sealed with the shell 10 by dispensing, and on this basis, the glue injection hole 11 corresponding to the bent section 313 is further provided, so that in the conventional dispensing sealing operation, the glue can be injected from the glue injection hole 11, and the shell 10, the bent section 313, and the base 20 are further fixed, so that the structure of the electromagnetic relay is more stable.

[0053] Of course, in other embodiments, the glue injection hole 11 can also be provided separately, that is, it does not communicate with one of the dispensing grooves 14. At the same time, the wiring end and the lead end of the spring sheet 30 can also be sealed with the shell 10 by other means.

[0054] Although the present application has been particularly shown and described with respect to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details can be made therein without departing from the spirit and scope of the application as defined in the appended claims.

Claims

1. An electromagnetic relay comprising a housing, a base mounted in the housing, and a magnetic circuit system and a contact system mounted on the base, the contact system comprising at least two reeds; each of the reeds comprising a terminal end mounted to the base and a pin end extending out of the housing; characterized in that: The at least one reed has a bending section between the terminal end and the pin end, the bending section is located between the shell and the base; the shell is provided with a glue injection hole corresponding to the bending section, and the glue is injected into the shell through the glue injection hole to fixedly connect the shell, the bending section and the base; The end of the bending section close to the terminal end is defined as the front end, and the end close to the pin end is defined as the rear end; the bending section is further provided with an abutting surface facing the front end, and the base is further provided with a limiting protruding column, the limiting protruding column is located in front of the abutting surface and abuts against the abutting surface of the bending section; the inner side wall surface of the shell is recessed with a step connected with the glue injection hole, the limiting protruding column is higher than the bending section, the top end of the limiting protruding column abuts against the step and is exposed in the glue injection hole; the step is located at the front end of the glue injection hole; When the glue is injected, the glue is injected from the glue injection hole and can simultaneously fill the gap b between the limiting protruding column and the abutting surface, the gap a between the shell and the bending section and the gap between the bending section and the base.

2. The electromagnetic relay according to claim 1, characterized in that: The base is provided with an abutting boss, and the bending section abuts against the abutting boss.

3. The electromagnetic relay according to claim 1, characterized in that: The terminal end of the reed is provided with a hole slot for allowing the contact to deform, the hole slot extends to the bending section, and the hole slot located in the side wall surface of the bending section is the abutting surface, and the limiting protruding column is arranged in the hole slot.

4. The electromagnetic relay according to claim 1, characterized in that: The outer surface of the shell is recessed with a glue dispensing groove, the glue dispensing groove is provided with a through hole, and the pin end of the reed passes through the through hole and extends out of the shell; the glue injection hole is connected with the glue dispensing groove.

5. The electromagnetic relay according to claim 1, characterized in that: The number of the reeds is two, which are a static reed lead-out piece and a dynamic reed lead-out piece, and the dynamic reed lead-out piece has the bending section.

6. The electromagnetic relay according to claim 5, characterized in that: The bending section of the dynamic reed lead-out piece is horizontally arranged, the pin end of the dynamic reed lead-out piece vertically extends upward, and the terminal end of the dynamic reed lead-out piece extends downward.

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