Stroke anti-offset starting relay

Abstract

The utility model discloses a stroke anti-offset starting relay, which comprises a shell and an electromagnetic mechanism arranged in the shell, the electromagnetic mechanism comprises a framework, a coil positioned on the framework and an armature arranged in the framework in a sliding manner, the armature is provided with a push rod, and a guide cylinder piece is arranged between the push rod and the inner wall of the framework. The guide cylinder part is provided with an outer guide cylinder and an inner guide cylinder which are coaxially arranged, the outer guide cylinder is in close fit connection with the inner wall of the framework, the inner guide cylinder is in close fit connection with the outer wall of the push rod, the outer guide cylinder and the inner guide cylinder are matched in a sliding and sleeved mode, a plurality of balls are arranged on the inner wall of the outer guide cylinder in the circumferential direction, and a plurality of guide planes are arranged on the outer wall of the inner guide cylinder in the circumferential direction. The guide planes extend axially, and the balls abut against the corresponding guide planes in a sliding mode so as to limit radial deviation of the push rod. An integrated structure of fixing of the outer guide cylinder, moving of the inner guide cylinder along with the push rod and sliding limiting of the balls is adopted, and the inner guide cylinder supports the push rod and prevents inclination, deviation or deformation and bending. The balls are used for axial sliding guiding and friction reduction.

Description

Technical Field

[0001] This utility model relates to the field of relay technology, and in particular to a travel anti-offset starting relay. Background Technology

[0002] As a core component of circuit control, the starting relay's electromagnetic mechanism, particularly the coaxiality of the armature-driven push rod, directly affects the contact reliability of the contact system. In existing technologies, the push rod typically slides directly within the frame, relying solely on the clearance between the frame's inner wall and the push rod's outer wall for guidance, without any independent, precise constraint structure. On one hand, prolonged use can lead to increased radial clearance due to wear, causing push rod stroke deviation, resulting in transmission jamming, or even push rod bending, failing to meet the demands of high-precision motor starting scenarios. On the other hand, the rigid surface contact between the push rod and the frame's inner wall exhibits high frictional resistance, accelerating component wear, further widening the clearance, and potentially causing push rod jamming, affecting the action response speed. Utility Model Content

[0003] The purpose of this utility model is to overcome the defects of the prior art and provide a starting relay that adopts an integrated structure of "outer guide cylinder fixed + inner guide cylinder moving with push rod + ball sliding limit". The inner guide cylinder supports the push rod and prevents tilting, deviation or deformation and bending; the ball is used for axial sliding guidance to reduce friction.

[0004] The technical solution of this utility model is as follows: A stroke anti-offset starting relay includes a housing and an electromagnetic mechanism installed inside the housing. The electromagnetic mechanism includes a frame, a coil located on the frame, and an armature slidably disposed within the frame. A push rod is provided on the armature. A guide cylinder is provided between the push rod and the inner wall of the frame. The guide cylinder has an outer guide cylinder and an inner guide cylinder arranged coaxially. The outer guide cylinder is tightly connected to the inner wall of the frame, and the inner guide cylinder is tightly connected to the outer wall of the push rod. The outer guide cylinder and the inner guide cylinder are slidably sleeved together. Multiple balls are provided circumferentially on the inner wall of the outer guide cylinder, and multiple guide planes are provided circumferentially on the outer wall of the inner guide cylinder. The guide planes extend axially, and each ball slides against the corresponding guide plane to limit the radial offset of the push rod.

[0005] By adopting the above technical solution, through the integrated structure of "fixed outer guide cylinder + inner guide cylinder moving with push rod + ball sliding limit", the inner guide cylinder supports the push rod, effectively preventing it from tilting, deflecting or bending; while the multiple circumferentially distributed balls facilitate axial sliding guidance and reduce friction.

[0006] When the relay operates, the coil in the electromagnetic mechanism is energized, generating a magnetic field that attracts the armature to slide within the frame. The armature then drives the push rod to move. Because the outer guide cylinder of the guide tube is tightly fitted to the inner wall of the frame, and the inner guide cylinder is tightly fitted to the outer wall of the push rod, with the outer and inner guide cylinders slidingly sleeved together, and the ball bearings on the inner wall of the outer guide cylinder slidingly abutting against the guide plane on the outer wall of the inner guide cylinder, the push rod can only move axially during operation. This effectively limits the radial displacement of the push rod, avoiding problems such as poor contact caused by push rod misalignment, and improving the stability and reliability of the relay operation. Furthermore, this structure is simple and compact, occupies little space, and is easy to install and use.

[0007] A further feature of this invention is that an axially extending oil reservoir is provided on the guide plane of the inner guide cylinder, and the oil reservoir is a "V" shaped groove, and a portion of the ball can extend into the oil reservoir.

[0008] With the above-mentioned further design, the "V"-shaped oil reservoir can better store lubricating oil and facilitates the insertion of part of the ball bearings. When the ball bearings roll on the guide plane, the portion of the ball bearings that extends into the oil reservoir will drive the lubricating oil, distributing it across the contact surface between the ball bearings and the guide plane. This not only further reduces friction between the ball bearings and the guide plane, reducing wear and extending the service life of the inner guide cylinder and the ball bearings, but also reduces the heat generated by friction, preventing excessive temperature from affecting the relay's performance. This better ensures the stable axial movement of the push rod, improving the reliability and stability of the relay's operation.

[0009] A further feature of this invention is as follows: The frame includes a first sleeve and a second sleeve that are separately configured. The first sleeve and the second sleeve are fitted together and abut against each other through a first limiting surface and a second limiting surface to limit the axial fitting stroke. The outer periphery of the first sleeve and the second sleeve is respectively provided with a first baffle and a second baffle. The electromagnetic mechanism also includes a magnetic yoke. The magnetic yoke includes a first locking plate, a second locking plate, and a main plate connecting the two locking plates. Both locking plates are provided with a locking slot with an opening on one side, and the two locking slots face the same side. The two locking plates are respectively locked onto the first sleeve and the second sleeve. The first sleeve and the second sleeve are radially locked into the locking slots of the two locking plates, and the two locking plates abut against the baffles of the corresponding sleeves, thereby restricting the two sleeves from axially disengaging outward.

[0010] With the above-described further design, the housing is designed with detachable first and second sleeves. The axial insertion stroke of the first and second sleeves is limited by the abutment of the first and second limiting surfaces, preventing over-fitting. Simultaneously, two retaining plates abut against the baffles of their respective sleeves, achieving axial positioning of the two sleeves and preventing accidental disengagement, thus improving the overall structural stability and reliability. Furthermore, this split design facilitates the installation or maintenance of the relay's internal components; simply removing the magnetic yoke allows the two sleeves to be separated axially, significantly improving operational efficiency.

[0011] A further feature of this invention is that the magnetic yoke has a "U" shaped structure, the first card plate and the second card plate are elastically deformable, and the two card plates are tilted toward each other.

[0012] A further improvement in this invention is that, with the two clamping plates elastically deformable and tilted towards each other, when the first and second sleeves are radially engaged into the corresponding slots of the two clamping plates, the plates can better clamp the sleeves, further enhancing the stability of the clamping. This U-shaped structure and the elastically deformable design of the clamping plates give the magnetic yoke a certain degree of self-adaptation during installation. Even if there are certain errors in the size of the sleeves, a tight clamping can be achieved through the elastic deformation of the clamping plates, thereby improving the product's versatility and ease of installation.

[0013] A further feature of this invention is that the outer circumferential surfaces of the two sleeves are flush after being joined together, the coil is wound on the wire frame, and the wire frame is sleeved on the outer circumference of the two sleeves and abuts against the two baffles.

[0014] By further configuring the above-mentioned structure, the coil frame is placed on the outer circumferential surface of the two sleeves and rests between the two baffles. This structural arrangement allows the coil to be stably wound on the coil frame, and the coil frame is firmly restricted by the two baffles, preventing the coil frame from shifting or shaking during operation, thereby ensuring the stability and reliability of the coil winding.

[0015] A further feature of this invention is that the main plate of the magnetic yoke is provided with a clearance notch corresponding to the coil, and the clearance notch extends axially.

[0016] By further configuring the above-mentioned design, a clearance notch corresponding to the coil is provided on the main plate of the magnetic yoke, and this clearance notch extends axially. This design provides sufficient space for the coil, preventing direct contact between the main plate of the magnetic yoke and the coil, thus preventing damage to the coil insulation layer due to compression. Simultaneously, it provides space for heat dissipation, reducing the coil's operating temperature and extending its service life. This also makes the entire electromagnetic assembly structure more compact and rational, further improving the performance and stability of the starting relay.

[0017] A further feature of this invention is that the push rod and the armature are connected by a coupling. The coupling has shaft A and shaft B, and the opposing surfaces of the two shafts are respectively provided with a tooth and a groove. Shaft A is connected to the push rod, and shaft B is connected to the armature. The groove and tooth form a detachable connection, and the tooth slides radially into or out of the groove to achieve axial connection and positioning or radial sliding disengagement between the push rod and the armature.

[0018] By adopting the above-mentioned further design, the detachable connection structure of the coupling enables flexible transmission and rapid separation between the push rod and the armature. In the event of damage to a single component, it can be replaced individually, avoiding the need to replace the entire electromagnetic mechanism and reducing maintenance costs. Furthermore, the radial sliding of the teeth and grooves allows for automatic adjustment, ensuring that the normal transmission between the push rod and the armature is not affected. This guarantees the stability and reliability of the stroke-avoidance starter relay, effectively preventing problems such as poor contact and transmission jamming caused by component misalignment, and further improving the performance and service life of the starter relay.

[0019] A further feature of this invention is that the groove is a "T" shaped groove, the protruding tooth has a locking head and a central neck post, the locking head is circular and is axially limited inside the groove, and the neck post is cylindrical and protrudes from the slot on the groove.

[0020] By further configuring the groove as a "T" shaped groove and the protruding tooth as a structure with a locking head and a central neck post, the locking head can be axially limited inside the groove and can rotate inside, ensuring the stability of the connection between the protruding tooth and the groove and preventing the protruding tooth from accidentally coming out of the groove; while the neck post protrudes from the groove opening, realizing an effective connection with the push rod. Attached Figure Description

[0021] Figure 1 This is a structural diagram of a specific embodiment of the present utility model;

[0022] Figure 2 This is a structural diagram of the electromagnetic mechanism of a specific embodiment of the present utility model;

[0023] Figure 3 This is a structural diagram of the inner guide cylinder according to a specific embodiment of the present utility model;

[0024] Figure 4 This is a structural diagram of the first sleeve according to a specific embodiment of the present utility model;

[0025] Figure 5 This is a structural diagram of the second sleeve according to a specific embodiment of the present utility model;

[0026] Figure 6 This is a diagram of the magnetic yoke structure according to a specific embodiment of the present invention;

[0027] Figure 7This is a split view of shaft A and shaft B in a specific embodiment of this utility model.

[0028] In the diagram: 1. Housing; 2. Electromagnetic mechanism; 21. Frame; 21. First sleeve; 211. First limiting surface; 2111. First baffle; 2112. Second sleeve; 212. Second limiting surface; 2121. Second baffle; 2122. Coil; 22. Armature; 23. Push rod; 24. Magnetic yoke; 25. First locking plate; 251. Second locking plate; 252. Main plate; 253. Clearance notch; 2531. Bay; 254. Wire frame; 26. Guide cylinder; 4. Outer guide cylinder; 41. Inner guide cylinder; 42. Guide plane; 421. Oil reservoir; 4211. Ball bearing; 43. Shaft A; 511. Groove; 512. Shaft B; 521. Protruding tooth; 5211. Locking head; 5212. Neck post. Detailed Implementation

[0029] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0030] like Figure 1-7 As shown, this utility model discloses a travel anti-deviation starting relay, comprising a housing 1, an electromagnetic mechanism 2 installed within the housing 1, and a contact system. The contact system includes moving contacts and stationary contacts. The moving contacts are mounted on a moving contact bracket, and the stationary contacts are mounted on a stationary contact seat. The electromagnetic mechanism 2 includes a frame 21, a coil 22 located on the frame, and an armature 23 slidably disposed within the frame. A push rod 24 is provided on the armature 23. A guide cylinder 4 is provided between the push rod 24 and the inner wall of the frame 21. The guide cylinder 4 has an outer guide cylinder 41 and an inner guide cylinder 42 coaxially arranged. The outer guide cylinder 41 and the frame 21... The inner wall is tightly fitted (interference fit), the inner guide cylinder 42 is tightly fitted to the outer wall of the push rod 24, and the outer guide cylinder 41 is slidably sleeved with the inner guide cylinder 42. Multiple balls 43 are circumferentially arranged on the inner wall of the outer guide cylinder 41, and multiple guide planes 421 are circumferentially arranged on the outer wall of the inner guide cylinder 42, with the guide planes 421 extending axially. Each ball 43 slides against its corresponding guide plane 421 to limit the radial offset of the push rod 24. An axially extending oil reservoir 4211 is formed on the guide plane 421 of the inner guide cylinder 42, and a portion of the balls 43 can extend into the oil reservoir 4211. The oil reservoir 4211 can be a "V" shaped groove.

[0031] Specifically, the frame 21 includes a first sleeve 211 and a second sleeve 212 that are separately configured. The first sleeve 211 and the second sleeve 212 are sleeved together and abut against each other through a first limiting surface 2111 and a second limiting surface 2121 to limit the axial insertion stroke. A first baffle 2112 and a second baffle 2122 are respectively provided on the outer periphery of the first sleeve 211 and the second sleeve 212, wherein the first baffle 2112 is integrally provided on the first sleeve and the second baffle 2122 is integrally provided on the second sleeve. The electromagnetic mechanism 2 also includes a magnetic yoke 25, which includes a first mounting plate 251, a second mounting plate 252, and a main plate 253 integrally connecting the two mounting plates. Each mounting plate has a slot 254 with an opening on one side, and the two slots 254 face the same side. The two mounting plates are respectively mounted on the first sleeve 211 and the second sleeve 212. The first sleeve 211 and the second sleeve 212 are radially inserted into the slots 254 of the two mounting plates, and the two mounting plates abut against the baffles of the corresponding sleeves, thereby preventing the two sleeves from detaching axially outward. The magnetic yoke 25 has a "U" shaped structure. The first mounting plate 251 and the second mounting plate 252 are elastically deformable, and the two mounting plates are inclined towards each other. The outer circumferential surfaces of the two sleeves are flush after being fitted together. The coil 22 is wound on a wire frame 26, which is fitted around the outer circumference of the two sleeves and abuts against the two baffles. The main board 253 of the magnetic yoke is provided with a clearance notch 2531 for the corresponding coil, and the clearance notch 2531 extends axially.

[0032] Specifically, the push rod 24 and the armature 23 are connected by a coupling. The coupling has a shaft A51 and a shaft B52. The opposing surfaces of the two shafts are respectively provided with a tooth 521 and a groove 511. The tooth 521 is integrally provided on the shaft A51 or the shaft B52, while the groove 511 is provided on the shaft B52 or the shaft A51. The shaft A51 is integrally or threadedly connected to the push rod 24, and the shaft B52 is integrally or threadedly connected to the armature 23. The groove 511 and the tooth 521 form a detachable connection. The tooth 521 slides radially into or out of the groove 511 to achieve axial connection and positioning or radial sliding disengagement between the push rod 24 and the armature 23. The groove 511 is a "T" shaped groove, and the protruding tooth 521 has a locking head 5211 and a central neck post 5212. The locking head 5211 is circular and is axially limited inside the groove 511. The neck post 5212 is cylindrical and protrudes from the slot 512 on the groove 511.

[0033] Relay installation:

[0034] When installing the push rod and the armature, slide the protruding teeth radially into the groove until the chuck enters the "T"-shaped groove to complete the connection between the push rod and the armature.

[0035] When the push rod and armature are installed into the frame, the inner guide tube is tightly fitted to the outer wall of the push rod, and the outer guide tube is tightly fitted into the second sleeve of the frame. The outer guide tube is sleeved outside the inner guide tube, and the ball and the guide plane are in corresponding contact. The armature is installed into the first sleeve of the frame.

[0036] During skeleton assembly, the coil is first wound on the wire frame, the wire frame is sleeved around the outer circumference of the first sleeve, the first sleeve and the second sleeve are sleeved together, the two clamping plates of the magnetic yoke are aligned with the two sleeves, and the magnetic yoke is pushed along the opening direction of the clamping slots so that the two sleeves are correspondingly clamped into the clamping slots of the clamping plates, so that the two clamping plates abut against the outer side of the baffles of the two sleeves respectively, thereby clamping the two sleeves. At this time, the first limiting surface of the first sleeve and the second limiting surface of the second sleeve abut and limit each other.

[0037] The working principle is as follows:

[0038] When the coil is energized, it generates a magnetic field. Under the action of the magnetic field, the armature overcomes the spring force of the return spring and slides towards the contact system. Through the coupling, it drives the push rod to slide synchronously. Under the constraint of the guide cylinder, the push rod has no radial offset and pushes the moving contact bracket to move towards the stationary contact seat, so that the moving and stationary contacts make contact and the circuit is connected.

[0039] During the reset action, the magnetic field disappears after the coil is de-energized, and the armature can slide away from the contact system under the elastic force of the reset spring, driving the push rod to reset, separating the moving and stationary contacts, and breaking the circuit.

[0040] It should be noted that in the description of this utility model, all directional indicators (such as up, down, forward, backward, etc.) are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0041] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. In the description of this utility model, "a number" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," and "installation" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A travel anti-offset starting relay, comprising a housing (1) and an electromagnetic mechanism (2) installed within the housing (1), the electromagnetic mechanism (2) comprising a frame (21), a coil (22) located on the frame, and an armature (23) slidably disposed within the frame, the armature (23) being provided with a push rod (24), characterized in that: A guide cylinder (4) is provided between the push rod (24) and the inner wall of the frame (21). The guide cylinder (4) has an outer guide cylinder (41) and an inner guide cylinder (42) arranged coaxially. The outer guide cylinder (41) is tightly connected to the inner wall of the frame (21), and the inner guide cylinder (42) is tightly connected to the outer wall of the push rod (24). The outer guide cylinder (41) and the inner guide cylinder (42) are slidably sleeved together. Multiple balls (43) are provided circumferentially on the inner wall of the outer guide cylinder (41), and multiple guide planes (421) are provided circumferentially on the outer wall of the inner guide cylinder (42). The guide planes (421) extend axially, and each ball (43) slides against the corresponding guide plane (421) to limit the radial offset of the push rod (24).

2. The travel anti-deviation starting relay according to claim 1, characterized in that: An axially extending oil reservoir (4211) is provided on the guide plane (421) of the inner guide cylinder (42), and the oil reservoir (4211) is a "V" shaped groove, and a part of the ball (43) can extend into the oil reservoir (4211).

3. The travel anti-deviation starting relay according to claim 1, characterized in that: The frame (21) includes a first sleeve (211) and a second sleeve (212) that are separately arranged. The first sleeve (211) and the second sleeve (212) are fitted together and abut against each other through a first limiting surface (2111) and a second limiting surface (2121) to limit the axial fitting stroke. A first baffle (2112) and a second baffle (2122) are respectively provided on the outer periphery of the first sleeve (211) and the second sleeve (212). The electromagnetic mechanism (2) also includes a magnetic yoke (25), which includes... The first card plate (251), the second card plate (252), and the main board (253) connecting the two card plates are provided with a slot (254) with an opening on one side. The two slots (254) are open to the same side. The two card plates are respectively mounted on the first sleeve (211) and the second sleeve (212). The first sleeve (211) and the second sleeve (212) are radially inserted into the slots (254) of the two card plates. The two card plates abut against the baffles of the corresponding sleeves, thereby restricting the two sleeves from detaching axially outward.

4. The travel anti-deviation starting relay according to claim 3, characterized in that: The magnetic yoke (25) has a "U" shaped structure. The first card plate (251) and the second card plate (252) can be elastically deformed, and the two card plates are inclined towards each other.

5. The travel anti-deviation starting relay according to claim 3, characterized in that: The outer circumferences of the two sleeves are flush after they are joined together. The coil (22) is wound on the wire frame (26). The wire frame (26) is fitted around the outer circumference of the two sleeves and abuts against the two baffles.

6. The travel anti-deviation starting relay according to claim 3, characterized in that: The main board (253) of the magnetic yoke is provided with a clearance notch (2531) for the corresponding coil, and the clearance notch (2531) extends axially.

7. The travel anti-deviation starting relay according to any one of claims 1-6, characterized in that: The push rod (24) and the armature (23) are connected by a coupling. The coupling has a shaft A (51) and a shaft B (52). The opposing surfaces of the two shafts are respectively provided with a tooth (521) and a groove (511). The shaft A (51) is connected to the push rod (24), and the shaft B (52) is connected to the armature (23). The groove (511) and the tooth (521) form a detachable connection. The tooth (521) slides into or out of the groove (511) radially to achieve axial connection positioning or radial sliding disengagement between the push rod (24) and the armature (23).

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