A connection structure between a push rod and a moving iron core of a high voltage DC relay

Abstract

The invention discloses a connection structure between a push rod and a moving iron core of a high-voltage DC relay, comprising a push rod, a moving iron core and a sleeve made of metal material; a push rod polished rod is matched in a through hole of the moving iron core; the moving iron core is provided with a first groove with an opening facing downward; the sleeve is sleeved outside the push rod and a part of the sleeve is extended into the first groove; the push rod is provided with a recessed portion; the inner wall of the sleeve is provided with a protruding portion; the sleeve and the push rod are riveted or cold extruded so that the protruding portion of the sleeve is stuck in the recessed portion of the push rod. The invention can effectively solve the problem of thread eccentricity by using a polished rod for positioning and canceling the threaded connection, and improve the problem that the rotation of the iron core in the X / Y direction cannot be effectively restricted due to the gap between the tooth top and the tooth bottom between the internal and external threads; by using a stopper to stop and cancel the glue dispensing, it can not only avoid the defects of organic matter and foreign matter caused by the glue dispensing, but also reduce the time required for the glue dispensing curing, thereby improving the production speed.

Description

Technical Field

[0001] The invention relates to the technical field of relays, and in particular to a connection structure between a push rod and a moving iron core of a high-voltage direct current relay. Background Art

[0002] The high-voltage DC relay of the prior art usually adopts a dynamic spring direct-acting type (also called a solenoid direct-acting type) structure. The contact part of this high-voltage DC relay includes two static contacts (i.e., load lead-out terminals) and a dynamic component. The dynamic component includes a dynamic spring part and a push rod component. The dynamic spring part is bridge-type and fits between the two static contacts and is installed on the top of the push rod component. Through the reciprocating motion of the push rod component, the two dynamic contacts of the dynamic spring part are respectively in contact with or separated from the two static contacts. When in contact, the current flows into one of the static contacts and flows out from the other static contact after passing through the dynamic spring part. The push rod component includes a push rod and a dynamic iron core connected to the lower part of the push rod (the top of the push rod is usually connected to the spring seat in the push rod component). Through the cooperation of the dynamic iron core with the coil, the static iron core and other components, the push rod is driven to reciprocate by the dynamic iron core. Since the dynamic iron core needs to move synchronously with the push rod, it is necessary to fix the dynamic iron core at the lower part of the push rod. In the prior art, the external thread of the push rod and the internal thread of the moving iron core are usually used to limit the movement and rotation of the moving iron core relative to the push rod in the horizontal X / Y direction, and the bottom of the moving iron core and the push rod are fixed with glue to limit the movement and rotation of the moving iron core relative to the push rod in the Z direction.

[0003] The threaded connection method of the prior art cannot effectively limit the rotation of the moving iron core in the X / Y direction due to the gap between the top and bottom of the inner and outer threads, resulting in eccentricity and skewness of the axis, which makes the product movement process more seriously interfered, affecting the electrical parameters of the product such as attraction and rebound. At the same time, the contact surface and the moving and static iron cores are not parallel when closed, which reduces the stability of the holding force and causes the product's anti-short circuit performance to have a scattered difference. The use of glue fixation to limit the movement and rotation of the moving iron core in the Z direction has the following disadvantages: First, due to the long-term movement of the product, closed contact, and long-term high temperature operation, there is a risk of cracking the glue and generating foreign matter, which will seriously cause fatal defects such as non-conduction of the product; second, the volatilization of organic matter affects the atmosphere of the sealed cavity and causes a decrease in arc extinguishing ability; third, the production cycle is long and the beat is slow. The current production temperature is 110℃, and the oven baking and cooling are more than 40mins, and the equipment occupies a large area and investment; fourth, it is more difficult to control the amount of liquid. A large amount of glue is easy to overflow, and a small amount of glue is unreliable and easy to generate bubbles. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a connection structure between a push rod and a moving iron core of a high-voltage DC relay. By using a smooth rod for positioning and eliminating the threaded connection, the problem of thread eccentricity can be effectively solved, and the problem of the inability to effectively limit the rotation of the iron core in the X / Y direction due to the gap between the tooth top and the tooth bottom between the internal and external threads can be improved. By using a stopper to stop and eliminate the glue, not only can the defects of organic matter and foreign matter caused by cracking of the glue be avoided, but also the time required for the glue curing can be reduced, thereby improving the production speed.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a connection structure between a push rod and a moving iron core of a high-voltage DC relay, comprising a push rod, a moving iron core and a sleeve made of metal material; a downward step is provided at the upper position of the lower section of the push rod, and the step of the push rod is against the upper surface of the moving iron core; the moving iron core is provided with a through hole that penetrates from top to bottom, and the middle part of the lower section of the push rod is matched in the through hole of the moving iron core; a first groove with an opening facing downward is provided at a position corresponding to the through hole at the bottom of the moving iron core; the sleeve is sleeved outside the push rod and makes the sleeve A part of the sleeve extends into the first groove, and the top end of the sleeve is against the bottom of the first groove; in the lower section of the push rod, a recessed portion is provided at a position corresponding to the outside of the first groove, which is radially recessed inward; in the inner wall of the sleeve, a protruding portion is provided at a position corresponding to the recessed portion of the push rod; the sleeve and the push rod are connected by riveting or cold extrusion, so that the protruding portion of the sleeve is stuck in the recessed portion of the push rod under the action of riveting or cold extrusion, and the expansion force after riveting or cold extrusion is transmitted through the sleeve itself, and the top end of the sleeve reacts on the moving iron core to tighten it.

[0006] The inner wall of the sleeve and the outer wall of the push rod are clearance-matched.

[0007] The recessed portion of the push rod is an annular groove arranged on the outer peripheral wall of the push rod, and the protruding portion of the inner wall of the sleeve is a corresponding matching annular convex strip.

[0008] The annular groove of the push rod is one or a plurality of annular grooves arranged at intervals from each other, and the annular protrusions on the inner wall of the sleeve are also one or a plurality of annular protrusions arranged at intervals from each other.

[0009] The recessed portion of the push rod is a knurled structure surrounding the outer peripheral wall of the push rod, and the protruding portion of the inner wall of the sleeve is a correspondingly matched knurled shape.

[0010] The knurling structure of the push rod is one or multiple knurling structures arranged at intervals from each other, and the annular protrusions on the inner wall of the sleeve are also one or multiple corresponding knurling structures arranged at intervals from each other.

[0011] A first recess is provided in the outer wall of the sleeve at a position corresponding to the protruding portion.

[0012] The protruding portion of the inner wall of the sleeve is formed by punching out a first concave channel on the outer wall of the sleeve.

[0013] A second annular recess is also provided in the outer wall of the sleeve near the top.

[0014] A second groove with an upward opening is provided at a position corresponding to the through hole on the upper part of the moving iron core; the step of the push rod abuts against the bottom of the second groove of the moving iron core.

[0015] The bottom of the moving iron core is also provided with a third groove connected to the axial direction of the first groove, and the first groove is relatively small, the third groove is relatively large, the first groove is closer to the inside, and the third groove is closer to the outside; the bottom end of the lower section of the push rod is completely accommodated in the third groove.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] The present invention adopts a bare rod in the middle part of the lower section of the push rod to fit in the through hole of the moving iron core and a sleeve made of metal material as a stop component to limit the downward movement of the moving iron core relative to the push rod, and in the lower section of the push rod, at a position corresponding to the outside of the first groove, a recessed portion that is radially recessed inward is also provided; in the inner wall of the sleeve, at a position corresponding to the recessed portion of the push rod, a protruding portion is also provided; the sleeve and the push rod are connected by riveting or cold extrusion technology, so that the protruding portion of the sleeve is stuck in the recessed portion of the push rod under the action of riveting or cold extrusion, and the expansion force after riveting or cold extrusion is transmitted through the sleeve itself, and the top end of the sleeve reacts to the moving iron core to tighten it. This structure of the present invention, by using a smooth rod for positioning and eliminating the threaded connection, can effectively solve the problem of thread eccentricity and improve the problem that the rotation of the iron core in the X / Y direction cannot be effectively restricted due to the gap between the tooth top and the tooth bottom between the internal and external threads; by adopting a sleeve stop and eliminating the glue spot, it can not only avoid the defects of organic matter, cracking and foreign matter caused by the glue spot, but also reduce the time required for the glue spot curing, thereby improving the production speed.

[0018] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments; however, the connection structure between the push rod and the moving iron core of a high-voltage DC relay of the present invention is not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front view of a partial structure of a high-voltage DC relay according to the first embodiment of the present invention;

[0020] Figure 2 is a bottom view of a partial structure of a high voltage DC relay according to the first embodiment of the present invention;

[0021] Figure 3 is a side view of a partial structure of a high voltage DC relay according to the first embodiment of the present invention;

[0022] Figure 4 is along Figure 1 Sectional view along line AA;

[0023] Figure 5 is an exploded schematic diagram of a partial structure of a high voltage DC relay according to the first embodiment of the present invention;

[0024] Figure 6 is along Figure 5 Sectional view along the midline BB;

[0025] Figure 7 yes Figure 6 The enlarged schematic diagram of the C part in FIG.

[0026] Figure 8 yes Figure 6 An enlarged schematic diagram of the D portion in FIG.

[0027] Fig. 9 is a front view of a partial structure of a high voltage DC relay according to a second embodiment of the present invention;

[0028] Fig.10 is along Fig. 9 Sectional view along line EE;

[0029] Fig.11 is an exploded schematic diagram of a partial structure of a high voltage DC relay according to a second embodiment of the present invention;

[0030] Fig.12 is along Fig.11 Sectional view along line FF;

[0031] Fig.13 yes Fig.12 The enlarged schematic diagram of the G section in FIG.

[0032] Fig.14 yes Fig.12 Enlarged schematic diagram of part H in FIG. DETAILED DESCRIPTION

[0033] Embodiment 1

[0034] See also Figures 1 to 8As shown, a connection structure between a push rod and a moving iron core of a high-voltage DC relay of the present invention comprises a push rod 1, a moving iron core 2 and a sleeve 3 made of a metal material; the high-voltage DC relay also comprises components such as a yoke iron plate 41, a spring seat 42, a static iron core 43 and a reset spring 44, wherein the spring seat 42 is fixed to the top of the push rod 1, the spring seat 42 is located above the yoke iron plate 41, the spring seat 42 is usually further connected to a fixing plate 45, and the static iron core 43 is fixed to the bottom of the yoke iron plate 41, The push rod 1 passes through the yoke iron plate 41 and the static iron core 43 from the top of the yoke iron plate 41, and is connected to the moving iron core 2 below the static iron core 43. The reset spring 44 is arranged between the static iron core 43 and the moving iron core 2. A downward step 11 is arranged at the upper position of the lower section of the push rod 1. The step 11 of the push rod 1 abuts against the top of the moving iron core 2. The moving iron core 2 is restricted from moving upward relative to the push rod by the limiting effect of the step 11. The moving iron core 2 is provided with a through hole 21 that penetrates from top to bottom. The middle part of the lower section of the moving rod 1 is fitted in the through hole 21 of the moving iron core 2; a first groove 22 with an opening facing downward is provided at a position corresponding to the through hole 21 at the bottom of the moving iron core 2; the sleeve 3 is sleeved outside the push rod 1 so that a part of the sleeve 3 extends into the first groove 22, and the top end of the sleeve 3 abuts against the groove bottom 221 of the first groove 22; in the lower section of the push rod 1, at a position corresponding to the outside of the first groove 22, a recessed portion 1 is further provided which is recessed radially inward. 2; a protrusion 31 is also provided in the inner wall of the sleeve 3 at a position corresponding to the recess 12 of the push rod 1; the sleeve 3 and the push rod 1 are connected by riveting or cold extrusion, so that the protrusion 31 of the sleeve 3 is inserted into the recess 12 of the push rod 1 under the action of riveting or cold extrusion, and the expansion force after riveting or cold extrusion is transmitted through the sleeve 3 itself, and the top end of the sleeve 3 reacts on the moving iron core 2 to tighten it, and the sleeve 3 is used to limit the downward movement of the moving iron core 2 relative to the push rod.

[0035] In this embodiment, there is a clearance fit between the inner wall of the sleeve 3 and the outer wall of the push rod 1 .

[0036] In this embodiment, the recessed portion 12 of the push rod 1 is an annular groove provided on the outer peripheral wall of the push rod, and the protruding portion 31 of the inner wall of the sleeve 3 is a corresponding matching annular convex strip.

[0037] In this embodiment, the annular groove 12 of the push rod 1 is one, and the annular protrusion 31 on the inner wall of the sleeve 3 is also one corresponding one. Of course, the annular grooves 12 of the push rod 1 can also be multiple and spaced apart from each other, and the annular protrusions on the inner wall of the sleeve can also be multiple and spaced apart from each other.

[0038] Of course, the recessed portion is not limited to the annular groove structure, but may also be a knurled structure surrounding the outer peripheral wall of the push rod, and the protruding portion of the inner wall of the sleeve is of course also configured to have a corresponding matching knurled shape.

[0039] Similarly, the knurling structure of the push rod can be one or multiple knurling structures that are spaced apart from each other, and the annular protrusions on the inner wall of the sleeve can also be correspondingly one or multiple knurling structures that are spaced apart from each other.

[0040] In this embodiment, a first recess 32 is provided in the outer wall of the sleeve 3 at a position corresponding to the protrusion 31 .

[0041] In this embodiment, the protrusion 31 on the inner wall of the sleeve 3 is formed by punching out a first recess 32 on the outer wall of the sleeve 3 .

[0042] In this embodiment, a second annular recess 33 is provided in the outer wall of the sleeve 3 near the top. The second recess 33 can be expanded and deformed at this position during riveting or cold extrusion between the sleeve 3 and the push rod 1, so as to better tighten the moving iron core 2.

[0043] In this embodiment, a second groove 23 with an upward opening is provided at a position corresponding to the through hole on the upper portion of the moving iron core 2; the step 11 of the push rod 1 abuts against the groove bottom 231 of the second groove 23 of the moving iron core. At the same time, the second groove 23 is also used to assemble the reset spring 44.

[0044] The present invention discloses a connection structure between a push rod and a moving iron core of a high-voltage DC relay, in which a middle part of the lower section of the push rod 1 is matched with a through hole 21 of the moving iron core 2, and a sleeve 3 made of metal material is used as a stop component to limit the downward movement of the moving iron core 2 relative to the push rod 1, and in the lower section of the push rod 1, at a position corresponding to the outside of the first groove 22, a recessed portion 12 which is recessed radially inward is also provided; in the inner wall of the sleeve 3, at a position corresponding to the recessed portion 12 of the push rod 1, a protruding portion 31 is also provided; the sleeve 3 and the push rod 1 are connected by riveting or cold extrusion process, so that the protruding portion 31 of the sleeve 3 is stuck in the recessed portion 12 of the push rod 1 under the action of riveting or cold extrusion, and the expansion force after riveting or cold extrusion is transmitted through the sleeve 3 itself, and the top end of the sleeve 3 reacts to the moving iron core to tighten it. This structure of the present invention, by using a smooth rod for positioning and eliminating the threaded connection, can effectively solve the problem of thread eccentricity and improve the problem that the rotation of the iron core in the X / Y direction cannot be effectively restricted due to the gap between the tooth top and the tooth bottom between the internal and external threads; by adopting a sleeve stop and eliminating the glue spotting, it can not only avoid the defects of organic matter, cracking and foreign matter caused by the glue spotting, but also reduce the time required for the glue spotting to cure, thereby improving the production speed.

[0045] Embodiment 2

[0046] See also Figures 9 to 14 As shown, the connection structure between the push rod and the moving iron core of a high-voltage DC relay of the present invention is different from that of the first embodiment in that the bottom of the moving iron core 2 is further provided with a third groove 24 connected to the first groove 22 in the axial direction, and the first groove 22 is relatively small, the third groove 24 is relatively large, the first groove 22 is closer to the inside, and the third groove 24 is closer to the outside; the bottom end of the lower section of the push rod 1 is completely accommodated in the third groove 24. In this structure of the present invention, the recessed portion 12 of the push rod 1 can be made relatively longer in the axial direction, so that the sleeve 3 and the push rod 1 are easier to cooperate. In addition, since the bottom end of the lower section of the push rod 1 is completely accommodated in the third groove 24, the bottom end surface of the moving iron core 2 is flat.

[0047] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above, or modify it into an equivalent equivalent embodiment without departing from the scope of the technical solution of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A connection structure between a push rod and a moving iron core of a high-voltage DC relay, comprising a push rod, a moving iron core and a sleeve made of a metal material; a downward step is provided at the upper position of the lower section of the push rod, and the step of the push rod abuts against the upper surface of the moving iron core; the moving iron core is provided with a through hole penetrating from top to bottom; characterized in that: The middle part of the lower section of the push rod is fitted in the through hole of the moving iron core; a first groove with an opening facing downward is provided at a position corresponding to the through hole at the bottom of the moving iron core; the sleeve is sleeved outside the push rod and a part of the sleeve extends into the first groove, and the top end of the sleeve is against the bottom of the first groove; in the lower section of the push rod, at a position corresponding to the outside of the first groove, there is also a recessed portion surrounding the outer circumferential wall of the push rod which is radially inwardly recessed, and the recessed portion surrounding the outer circumference of the push rod is continuous or discontinuous; in the inner wall of the sleeve, at a position corresponding to the recessed portion of the push rod, a corresponding protrusion is also provided; the sleeve and the push rod are connected by riveting or cold extrusion technology, so that the protrusion of the sleeve is stuck in the recessed portion of the push rod under the action of riveting or cold extrusion, and the expansion force after riveting or cold extrusion is transmitted through the sleeve itself, and the top end of the sleeve reacts to the moving iron core to tighten it.

2. The connection structure between the push rod and the moving iron core of the high-voltage DC relay according to claim 1, characterized in that: The inner wall of the sleeve and the outer wall of the push rod are clearance-matched.

3. The connection structure between the push rod and the moving iron core of the high-voltage DC relay according to claim 1 or 2, characterized in that: The recessed portion of the push rod is an annular groove arranged on the outer peripheral wall of the push rod, and the protruding portion of the inner wall of the sleeve is a corresponding matching annular convex strip.

4. The connection structure between the push rod and the moving iron core of the high-voltage DC relay according to claim 3, characterized in that: The annular groove of the push rod is one or a plurality of annular grooves arranged at intervals from each other, and the annular protrusions on the inner wall of the sleeve are also one or a plurality of annular protrusions arranged at intervals from each other.

5. The connection structure between the push rod and the moving iron core of the high-voltage DC relay according to claim 1 or 2, characterized in that: The recessed portion of the push rod is a knurled structure surrounding the outer peripheral wall of the push rod, and the protruding portion of the inner wall of the sleeve is a correspondingly matched knurled shape.

6. The connection structure between the push rod and the moving iron core of the high-voltage DC relay according to claim 5, characterized in that: The knurling structure of the push rod is one or multiple knurling structures arranged at intervals from each other, and the annular protrusions on the inner wall of the sleeve are also one or multiple corresponding knurling structures arranged at intervals from each other.

7. The connection structure between the push rod and the moving iron core of the high-voltage DC relay according to claim 1, characterized in that: A first recess is provided in the outer wall of the sleeve at a position corresponding to the protruding portion.

8. The connection structure between the push rod and the moving iron core of the high-voltage DC relay according to claim 7, characterized in that: The protruding portion of the inner wall of the sleeve is formed by punching out a first concave channel on the outer wall of the sleeve.

9. The connection structure between the push rod and the moving iron core of the high-voltage DC relay according to claim 7, characterized in that: A second annular recess is also provided in the outer wall of the sleeve near the top.

10. The connection structure between the push rod and the moving iron core of the high-voltage DC relay according to claim 1, characterized in that: A second groove with an upward opening is provided at a position corresponding to the through hole on the upper part of the moving iron core; the step of the push rod abuts against the bottom of the second groove of the moving iron core.

11. The connection structure between the push rod and the moving iron core of the high-voltage DC relay according to claim 1, characterized in that: The bottom of the moving iron core is also provided with a third groove connected to the axial direction of the first groove, and the first groove is relatively small, the third groove is relatively large, the first groove is closer to the inside, and the third groove is closer to the outside; the bottom end of the lower section of the push rod is completely accommodated in the third groove.

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