Relay

Abstract

Disclosed in the present invention is a relay, comprising: an arc extinguishing cover, a magnetic pole piece sealingly connected to the arc extinguishing cover, and an insulating support accommodated in the arc extinguishing cover and mounted on the magnetic pole piece. The relay further comprises a tensioning device positioned between the arc extinguishing cover and the insulating support, and the arc extinguishing cover is used for pressing the insulating support by means of the tensioning device. According to the relay of the present invention, the tensioning device is arranged between the insulating support and the arc extinguishing cover, and the insulating support is fixed between the magnetic pole piece and the arc extinguishing cover, so that the step of implementing a riveting process on a magnetic pole piece in traditional modes is omitted, the takt time is shortened, and the production efficiency is improved.

Description

relay Technical Field

[0001] The present invention relates to the technical field of relays, and in particular to a relay. Background Art

[0002] In the field of high-voltage DC relays, the product's operating conditions often require the relay to be able to withstand short-term, high currents without causing the contacts to open. To enhance this performance, high-voltage DC relays generally incorporate a short-circuit-resistant structure. Currently, the mainstream short-circuit-resistant structure in high-voltage DC relays on the market is based on two armatures positioned above and below the moving contact. The lower armature is fixed to the moving contact, while the upper armature is separately fixed and maintained at a certain distance from the lower armature. After the moving contact and the stationary contact are in contact, the magnetic field generated by the current flowing through the moving contact magnetizes the upper and lower armatures, creating an attractive force between the two armatures and acting on the moving contact. This creates an upward compensating force on the moving contact to overcome the electrodynamic repulsion, ensuring that it will not open even when carrying high currents.

[0003] At present, there are two conventional practices for the installation structure of the upper armature. One of them is to fix the upper armature to the magnetic pole piece through a metal bracket, which is usually fixed by riveting. Since the upper armature is fixed to the moving contact piece, it belongs to the high-voltage part, and the lower armature is fixed to the magnetic pole piece through a metal bracket, it belongs to the low-voltage part, and the distance between the upper and lower armatures is small, so this solution will have the risk of high and low voltage breakdown. In addition, the pressure riveting may also cause the thin wall of the magnetic pole piece to be damaged, resulting in the risk of air leakage (the arc extinguishing chamber of the high-voltage DC relay is usually filled with inert gas, and the sealing needs to be ensured). Another solution is to braze or bond the upper armature to the ceramic cover. This solution requires brazing and bonding processes, which are difficult to operate. There is a high risk of the upper armature falling off, and the height size of the ceramic cover is difficult to control, making it difficult to control the distance between the upper and lower armatures, affecting the product's anti-short-circuit performance.

[0004] Summary of the Invention

[0005] The problem to be solved by the present invention is to provide a relay to overcome the defects of existing relays with anti-short circuit structures, such as unreliable high and low voltage insulation, risk of air leakage, high cost and complex production process.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a relay, including: an arc extinguishing hood, a magnetic pole piece sealed to the arc extinguishing hood, and an insulating bracket accommodated in the arc extinguishing hood, the insulating bracket being installed on the magnetic pole piece, the relay also including a tensioning device located between the arc extinguishing hood and the insulating bracket, the arc extinguishing hood being used to press the insulating bracket through the tensioning device.

[0007] As a further improvement of the present invention, the tensioning device is any one or a combination of elastic silicone, rubber, spring, belt, reed, and elastic gasket.

[0008] As a further improvement of the present invention, a limiting piece is provided on the top of the insulating bracket, one end of the tensioning device is matched and connected to the limiting piece, and the other end of the tensioning device is placed against the inner wall of the arc extinguishing cover.

[0009] As a further improvement of the present invention, the limiting piece on the top of the insulating bracket is set as a limiting convex ring, the tensioning device is rubber or silicone, the tensioning device made of rubber or silicone is provided with a through hole matching the limiting convex ring and is sleeved on the limiting convex ring, and the other end of the tensioning device made of rubber or silicone is elastically pressed against the inner wall of the arc extinguishing cover to limit the movement of the insulating bracket in the vertical direction.

[0010] As a further improvement of the present invention, the limiting piece on the top of the insulating bracket is set as a first limiting protrusion, the tensioning device is rubber or silicone, the tensioning device made of rubber or silicone is set as a clamping ring matching the first limiting protrusion, the clamping ring is sleeved outside the first limiting protrusion, and the other end of the rubber or silicone tensioning device is elastically pressed against the inner wall of the arc extinguishing cover to limit the movement of the insulating bracket in the vertical direction.

[0011] As a further improvement of the present invention, the magnetic pole piece is provided with a first positioning member in the direction toward the insulating bracket, and the insulating bracket is provided with a second positioning member matching the first positioning member to limit the movement of the insulating bracket along the plane where the magnetic pole piece is located.

[0012] As a further improvement of the present invention, one of the first positioning member and the second positioning member includes a first positioning convex bump, and the other includes a first positioning groove matching the first positioning convex bump, and the first positioning convex bump is plugged into the first positioning groove.

[0013] As a further improvement of the present invention, the insulating bracket is provided with a main body and a support portion integrally connected to the main body, the main body is mounted with a second magnetic conductor, and the tensioning device abuts against the main body.

[0014] As a further improvement of the present invention, the relay also includes a push rod, a support frame, an insulating base and a moving contact piece. The upper end of the push rod and the lower end of the support frame are integrally injection-molded in the insulating base. The moving contact piece is upwardly abutted against the top of the support frame. The insulating bracket is mounted on the support frame. The insulating bracket includes support parts extending downward from both sides of the main body, and the support parts are located outside the two long sides of the moving contact piece. The first positioning groove is provided at the bottom end of the support part.

[0015] As a further improvement of the present invention, the first positioning member includes at least two first positioning protrusions provided on the top surface of the magnetic pole piece, and the second positioning member includes at least two first positioning grooves provided on the bottom surface of the support portion, and the first positioning protrusions are inserted into the corresponding first positioning grooves.

[0016] The beneficial effects of the present invention are:

[0017] The present invention provides a relay, which fixes the insulating bracket between the magnetic pole piece and the arc extinguishing cover by arranging a tensioning device between the insulating bracket and the arc extinguishing cover, thereby eliminating the step of performing a riveting process on the magnetic pole piece in a traditional method, shortening the production cycle, and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG1 is a front view of a first embodiment of a relay according to the present invention;

[0019] FIG2 is a cross-sectional view of a first embodiment of a relay according to the present invention;

[0020] FIG3 is an exploded view of a first embodiment of a relay according to the present invention;

[0021] FIG4 is a perspective view of the first embodiment of the relay according to the present invention after the arc extinguishing cover is removed;

[0022] FIG5 is an exploded view of the pole piece, insulating bracket and tensioning device in the first embodiment of the relay of the present invention;

[0023] FIG6 is a perspective view of an insulating bracket in a first embodiment of a relay according to the present invention;

[0024] FIG7 is a bottom view of the insulating bracket and the second magnetic conductor in the first embodiment of the relay of the present invention;

[0025] FIG8 is a cross-sectional view of the insulating bracket and the second magnetic conductor in the first embodiment of the relay of the present invention;

[0026] FIG9 is a perspective view of the second magnetic conductor in the first embodiment of the relay of the present invention;

[0027] FIG10 is a front view of the second magnetic conductor in the first embodiment of the relay of the present invention;

[0028] FIG11 is a perspective view of a movable contact piece and a push rod assembly in a first embodiment of a relay according to the present invention;

[0029] FIG12 is an exploded view of the movable contact piece and push rod assembly in the first embodiment of the relay of the present invention;

[0030] FIG13 is a perspective view of the assembly of the insulating bracket and the magnetic pole piece in the second embodiment of the relay of the present invention;

[0031] FIG14 is an exploded view of the insulating bracket and the pole piece in the second embodiment of the relay of the present invention;

[0032] FIG15 is a perspective view of the insulating bracket and the second magnetic conductor in the second embodiment of the relay of the present invention;

[0033] FIG16 is an exploded view of the insulating bracket and the magnetic pole piece in the third embodiment of the relay of the present invention;

[0034] FIG17 is a cross-sectional view of the insulating bracket and the clamping ring in the fourth embodiment of the relay of the present invention;

[0035] FIG18 is a perspective view of an insulating bracket in a fourth embodiment of a relay according to the present invention;

[0036] FIG19 is a cross-sectional view of the arc extinguishing cover, insulating bracket and clamping ring in the fifth embodiment of the relay of the present invention;

[0037] FIG20 is a perspective view of an insulating bracket in a fifth embodiment of a relay according to the present invention;

[0038] FIG21 is a cross-sectional view of the arc extinguishing cover, insulating bracket and clamping ring in the sixth embodiment of the relay of the present invention;

[0039] FIG22 is a perspective view of an insulating bracket in a sixth embodiment of a relay according to the present invention;

[0040] FIG23 is a cross-sectional view of the arc extinguishing cover, insulating bracket and tensioning device in the seventh embodiment of the relay of the present invention;

[0041] FIG24 is a perspective view of the tensioning device in the seventh embodiment of the relay of the present invention;

[0042] FIG25 is a cross-sectional view of the arc extinguishing cover, insulating bracket and tensioning device in the eighth embodiment of the relay of the present invention;

[0043] FIG26 is a perspective view of the arc extinguishing cover in the eighth embodiment of the relay of the present invention;

[0044] FIG27 is a three-dimensional diagram of the insulating bracket in the eighth embodiment of the relay of the present invention.

[0045] The following description is made with reference to the accompanying drawings:

[0046] 1. Arc extinguishing cover; 101. Second limiting protrusion; 2. Pole piece; 21. First positioning protrusion; 22. Through hole; 23. Second positioning groove; 3. Moving contact piece; 31. Positioning groove; 4. First magnetic conductor; 41. Bottom plate; 411. Positioning platform; 42. Side plate; 5. Second magnetic conductor; 51. Inclined surface; 52. Groove; 53. Glue groove; 6. Insulating bracket; 61. Main body; 611. Limiting protrusion; 612. First limiting Positioning protrusion; 613, limiting groove; 62, supporting part; 621, first positioning groove; 622, supporting foot; 623, supporting leg; 624, second positioning protrusion; 7, moving iron core; 8, tensioning device; 81, clamping ring; 82, blind hole; 9, static contact; 10, push rod; 11, supporting frame; 111, avoidance window; 12, insulating base; 13, contact spring; 14, sleeve; 15, connecting ring; 16, static iron core. DETAILED DESCRIPTION

[0047] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0048] Example 1

[0049] Referring to Figures 1 to 12 , the present invention provides a relay comprising an arc extinguishing cover 1, a contact assembly, an anti-short-circuit assembly, a push rod assembly, and an electromagnetic mechanism. The contact assembly comprises a movable contact piece 3 and a stationary contact 9. While this embodiment illustrates one movable contact piece 3 and two stationary contacts 9, this does not necessarily limit the number of movable contacts 3 and stationary contacts 9. For example, other embodiments also allow for two movable contact pieces 3 and four stationary contacts 9.

[0050] Referring to Figures 1 through 3, two static contacts 9 are welded side by side, spaced apart, to the top of the arc chute 1. The lower ends of both static contacts 9 extend into the arc chute 1. The moving contact 3 and the anti-short-circuit assembly are housed within the arc chute 1, with both ends of the moving contact 3 positioned directly below the two static contacts 9. A push rod assembly is connected between the moving contact 3 and the electromagnetic mechanism. The electromagnetic mechanism is used to drive the moving contact 3 up and down via the push rod assembly to connect or disconnect the two static contacts 9.

[0051] Referring to Figures 2 to 4 , the short-circuit protection assembly includes a first magnetic conductor 4, a second magnetic conductor 5, and an insulating bracket 6. The first magnetic conductor 4 is fixed to the movable contact piece 3, while the second magnetic conductor 5 is fixed to the insulating bracket 6 and spaced relative to and above the first magnetic conductor 4. The second magnetic conductor 5 is also located above the movable contact piece 3 and between the two stationary contacts 9. When the electromagnetic mechanism drives the movable contact piece 3 upward via the push rod assembly, bridging the movable contact piece 3 between the two stationary contacts 9, the first magnetic conductor 4 also moves synchronously with the movable contact piece 3, with a gap between it and the second magnetic conductor 5. Current flowing through the movable contact piece 3 generates a spiral magnetic field, magnetizing the first and second magnetic conductors 4, 5. This creates an attractive force between the first and second magnetic conductors 4, 5, which acts on the movable contact piece 3, providing an upward compensating force on the movable contact piece 3 to overcome the electrodynamic repulsion, thereby improving the short-circuit protection.

[0052] The first magnetic conductor 4 and the second magnetic conductor 5 can be made of metals such as iron, nickel or alloys thereof.

[0053] Furthermore, the electromagnetic mechanism includes a magnetic circuit assembly, which includes a pole piece 2. The bottom of the arc extinguishing cover 1 is sealed and welded to the top of the pole piece 2 via a connecting ring 15. The pole piece 2 is provided with a first positioning member in the direction toward the insulating bracket 6, and the insulating bracket 6 is provided with a second positioning member that matches the first positioning member. The insulating bracket 6 is supported on the pole piece 2, and the first positioning member and the second positioning member are used in conjunction to limit the movement of the insulating bracket 6 along the plane of the pole piece 2. The first positioning member has a guiding and positioning function, so that the insulating bracket 6 can be accurately installed on the pole piece 2. The arc extinguishing cover 1 presses the insulating bracket 6 against the pole piece 2.

[0054] It should be noted that there are many ways to compress the insulating bracket 6 with the arc extinguishing hood 1, but if the arc extinguishing hood 1 is used to directly or indirectly compress the insulating bracket 6 with a rigid member, the following defects will occur: First, the arc extinguishing hood 1 is usually made of ceramic material, and this rigid compression may cause the arc extinguishing hood 1 made of ceramic material to be damaged; Second, the height of the arc extinguishing hood 1 is difficult to control, resulting in poor control of the accuracy of the compression of the insulating bracket 6, which often results in insufficient or excessive compression. In response to this, the present invention installs a tensioning device 8 between the arc extinguishing hood 1 and the insulating bracket 6. The arc extinguishing hood 1 presses the insulating bracket 6 onto the magnetic pole piece 2 through the tensioning device 8, thereby solving the aforementioned defects and achieving reliable and stable compression and fixation of the insulating bracket 6.

[0055] Optionally, the tensioning device 8 is made of elastic material, which mainly includes any one or a combination of elastic silicone, rubber, springs, belts, reeds, and elastic washers. In this embodiment, the tensioning device 8 is preferably made of rubber or silicone.

[0056] Furthermore, a limiting piece is provided on the top of the insulating bracket 6 , one end of the tensioning device 8 is matched and connected to the limiting piece, and the other end of the tensioning device 8 is placed against the inner wall of the arc extinguishing cover 1 .

[0057] Specifically, as shown in Figures 2 and 5, the limiting member at the top of the insulating bracket 6 is configured as a limiting protruding ring 611, and the tensioning device 8 made of rubber or silicone is configured as a clamping ring 81. The clamping ring 81 is provided with a through hole that matches the limiting protruding ring 611 and is sleeved on the limiting protruding ring 611. The diameter of the through hole is slightly larger than the diameter of the limiting protruding ring 611. Furthermore, by configuring the tensioning device 8 as an elastic clamping ring 81, the through hole provides deformation space for the clamping ring 81 when the ceramic cover is compressed. This achieves the positioning of the clamping ring 81. The other end of the rubber or silicone clamping ring 81 elastically abuts against the inner wall of the arc extinguishing cover 1 to limit the vertical movement of the insulating bracket 6.

[0058] The present invention uses an insulating bracket 6 to fix the second magnetic conductor 5, thereby realizing high and low voltage insulation between the high-voltage end of the moving contact piece 3, the first magnetic conductor 4, the static contact 9 and the low-voltage end of the magnetic pole piece 2. Even if a breakdown occurs between the first magnetic conductor 4 and the second magnetic conductor 5, the insulating bracket 6 can also isolate the high and low voltage ends to ensure good insulation voltage resistance performance; at the same time, the first positioning member and the second positioning member are used to cooperate to realize the horizontal positioning of the insulating bracket 6, and a tensioning device 8 is provided between the insulating bracket 6 and the arc extinguishing cover 1 to fix the insulating bracket 6 between the magnetic pole piece 2 and the arc extinguishing cover 1, thereby eliminating the riveting process of the traditional magnetic pole piece 2, eliminating the risk of air leakage caused by damage to the magnetic pole piece 2 due to pressure riveting, improving the qualified rate of the process, reducing the technical difficulty of the stamping process of the first positioning member of the magnetic pole piece 2, and reducing the cost of parts. By using the welding and fixing process of the arc extinguishing cover 1 in the subsequent step to realize the pressing and fixing of the insulating bracket 6, the production cycle can be shortened and the production efficiency can be accelerated.

[0059] Referring to Figures 4 to 6 , the insulating bracket 6 is an inverted U-shaped structure comprising a main body 61 and two support portions 62. A retaining ring 611 is positioned at the center of the top surface of the main body 61, and the tensioning device 8 abuts against the main body 61. The main body 61 is positioned between the two stationary contacts 9. The second magnetic conductor 5 and the insulating bracket 6 are integrally injection-molded and fixed to the main body 61. The two support portions 62 are integrally connected to the ends of the main body 61 and positioned outside the two long sides of the movable contact piece 3. A second positioning member is provided at the lower end of the support portion 62.

[0060] Furthermore, one of the first positioning member and the second positioning member includes a first positioning convex bump 21 , and the other includes a first positioning groove 621 matching the first positioning convex bump 21 . The first positioning convex bump 21 and the first positioning groove 621 are plugged into each other to achieve positioning.

[0061] Specifically, as shown in FIG5 , in this embodiment, the first positioning member includes, but is not limited to, four first positioning bumps 21 . The four first positioning bumps 21 are all provided on the top surface of the magnetic pole piece 2 and are distributed in a rectangular pattern. The first positioning bumps 21 can be integrally formed on the magnetic pole piece 2 using a process such as stamping. It is understood that the number of first positioning bumps 21 can be configured as needed, but at least two should be provided to meet positioning requirements. Preferably, the first positioning bumps 21 are, but are not limited to, cylindrical in shape. Shapes such as square pillars are also suitable. Depending on the part processing method, stamping a cylindrical shape provides the best part forming effect and structural strength.

[0062] As shown in Figures 4 and 6, notches are provided in the middle of the lower portions of the two support portions 62 to reduce material usage. Support legs 623 are formed on both sides of the notches. Each support leg 623 has a support foot 622 extending horizontally outward. The two support feet 622 on the same support portion 62 extend in opposite directions, and all four support feet 622 support the top surface of the pole piece 2. Accordingly, the second positioning member includes, but is not limited to, four first positioning grooves 621 that match the four first positioning bumps 21. The first positioning grooves 621 are respectively provided on the side of the support foot 622 facing away from the support portion 62. The first positioning bumps 21 fall into the corresponding first positioning grooves 621, thereby achieving horizontal positioning of the insulating bracket 6.

[0063] In this embodiment, the first positioning grooves 621 are semicircular grooves, which can provide a more flexible fit when plugged into the first positioning protrusions 21, facilitating assembly. Of course, in other embodiments, other forms of first positioning grooves 621 or positioning holes extending through the upper and lower surfaces of the support legs 622 can be used.

[0064] As one of the improvements of the present invention, the insulating bracket 6 is made of plastic material, and the second magnetic conductor 5 and the insulating bracket 6 are injection molded as one piece. No additional assembly is required between the two. The process is simple, the difficulty and cost of part forming are reduced, and the dimensional accuracy of the parts can be guaranteed.

[0065] As shown in FIG7 and FIG8 , the bottom surface of the second magnetic conductor 5 is exposed from the bottom surface of the main body 61 of the insulating bracket 6 to ensure that a larger suction force can be generated between the second magnetic conductor 5 and the first magnetic conductor 4, thereby ensuring better anti-short circuit capability.

[0066] Referring to Figures 6, 9, and 10, the second magnetic conductor 5 is generally rectangular in shape, with the lower ends of the two opposing side surfaces facing the two support portions 62 tilted toward each other, forming two inclined surfaces 51 arranged in an inverted "eight" shape. Both inclined surfaces 51 are enclosed by the main body 61 of the insulating bracket 6. By configuring the second magnetic conductor 5 in an inverted trapezoidal structure with a larger upper end and a smaller lower end, the present invention prevents the second magnetic conductor 5 from falling off the insulating bracket 6, thus avoiding the risk of the second magnetic conductor 5 falling off due to strong suction and insufficient adhesive bonding strength.

[0067] Preferably, the angle formed between the inclined surface 51 and the vertical surface is 1° to 2°.

[0068] It's worth noting that the top surface of the second magnetic conductor 5 is provided with a groove 52, which indicates that this side faces upward. This groove 52 also increases the contact area with the insulating bracket 6, thereby enhancing the bonding strength. Furthermore, both sides of the second magnetic conductor 5 are provided with adhesive grooves 53, further increasing the contact area with the insulating bracket 6 and further enhancing the bonding strength.

[0069] Referring to Figures 11 and 12 , the first magnetic conductor 4 is U-shaped and comprises a base plate 41 and two side plates 42 formed by bending the ends of the base plate 41 upward. The base plate 41 rests against the bottom surface of the movable contact piece 3 and is positioned by a positioning platform 411 on the top of the base plate 41 cooperating with a positioning slot 31 on the bottom of the movable contact piece 3. The two side plates 42 wrap around both sides of the movable contact piece 3 and extend toward the second magnetic conductor 5. The positioning platform 411 and the positioning slot 31 can be, but are not limited to, circular structures.

[0070] Furthermore, the push rod assembly includes a push rod 10, a support frame 11, an insulating base 12, and a contact spring 13. The upper end of the push rod 10 and the lower end of the support frame 11 are integrally injection-molded within the insulating base 12, and the insulating bracket 6 is mounted on the support frame 11. A through hole 22 is provided in the middle of the pole piece 2, and the lower end of the push rod 10 passes through the through hole 22 of the pole piece 2 and is connected to the electromagnetic mechanism. The moving contact piece 3 crosses the support frame 11, and the two side plates 42 of the first magnetic conductor 4 protrude upward from the avoidance windows 111 provided on both sides of the support frame 11. The two ends of the contact spring 13 elastically abut the first magnetic conductor 4 and the insulating base 12, respectively, so that the moving contact piece 3 is upwardly pressed against the top of the support frame 11.

[0071] The electromagnetic mechanism of the present invention utilizes conventional existing technology, which does not constitute an improvement in this application. As shown in Figures 2 and 3, in this embodiment, the electromagnetic mechanism further includes a coil winding (not shown), a moving iron core 7, a stationary iron core 16, and a sleeve 14, all disposed beneath the pole piece 2. The stationary iron core 16 is coaxially fixedly connected to the through-hole 22 of the pole piece 2. The moving iron core 7 is spaced relatively below the stationary iron core 16 and fixedly connected to the push rod 10. A return spring is installed between the moving iron core 7 and the stationary iron core 16. The sleeve 14 is cup-shaped, with a flange on the edge of its upper end. The sleeve 14 is mounted outside the moving iron core 7 and the stationary iron core 16 and is sealed and welded to the bottom surface of the pole piece 2 via the flange. The coil winding is sleeved outside the sleeve 14. The sleeve 14 not only guides the movement of the moving iron core 7 but also cooperates with the pole piece 2, the connecting ring 15, and the arc extinguishing hood 1 to form a sealed chamber for filling with an inert gas such as nitrogen or sulfur hexafluoride.

[0072] When the coil winding is energized, the magnetized moving iron core 7 is attracted by the static iron core 16 and moves upward, eventually closing onto the bottom of the static iron core 16. During this process, the moving iron core 7 pushes the moving contact piece 3 upward via the push rod assembly, causing the moving contact piece 3 to contact and conduct with the two static contacts 9. At the same time, current flows through the moving contact piece 3, generating a magnetic field that magnetizes the first and second magnetic conductors 4 and 5, creating an attractive force between them. This provides an upward compensating force on the moving contact piece 3 to overcome the electromotive force it is subjected to, thereby improving its short-circuit resistance. When the coil winding is de-energized, the magnetic attraction between the moving iron core 7 and the static iron core 16 disappears. Under the action of the reset spring, the moving iron core 7 moves downward, disconnecting the moving contact piece 3 from the two static contacts 9.

[0073] Example 2

[0074] Referring to Figures 13 to 15, the difference between this embodiment and the first embodiment is that the positioning method between the insulating bracket 6 and the pole piece 2 is adjusted. Specifically, the two supporting parts 62 of the insulating bracket 6 are also provided with two supporting legs 623, but there are no supporting feet 622 extending from the supporting legs 623; the second positioning member includes but is not limited to four first positioning grooves 621, and the first positioning grooves 621 are provided on the bottom surface of the corresponding supporting legs 623. It can be understood that the number of first positioning grooves 621 can be configured accordingly as needed, but at least two should be provided to meet the positioning requirements. Preferably, the first positioning groove 621 is of, but not limited to, a circular shape. Injection molding with a circular structure has the best part forming effect and structural strength. In addition, shapes such as square are also possible.

[0075] Correspondingly, the first positioning member includes four first positioning bumps 21 that match the four first positioning grooves 621 one by one. The four first positioning bumps 21 are all arranged on the top surface of the magnetic pole piece 2 and are distributed in a rectangular shape. The first positioning bumps 21 can be integrally formed on the magnetic pole piece 2 using a stamping process or other process.

[0076] The insulating bracket 6 is directly supported on the top surface of the magnetic pole piece 2 by the supporting legs 623 , and the first positioning bumps 21 are inserted into the corresponding first positioning grooves 621 , thereby limiting the movement of the insulating bracket 6 along the plane of the magnetic pole piece 2 .

[0077] Compared with the first embodiment, this embodiment has the advantage of reducing the plastic cost of the insulating bracket 6 .

[0078] Example 3

[0079] Referring to Figure 16, the difference between this embodiment and the first embodiment is that the positioning method between the insulating bracket 6 and the magnetic pole piece 2 is adjusted. Specifically, the two supporting parts 62 of the insulating bracket 6 are also provided with two supporting legs 623, but there are no supporting feet 622 extending from the supporting legs 623. The second positioning member includes but is not limited to four second positioning convex bumps 624, and the four second positioning convex bumps 624 are respectively provided on the bottom surfaces of the four supporting legs 623. It can be understood that the number of second positioning convex bumps 624 can be configured accordingly as needed, but at least two should be provided to meet the positioning requirements. Preferably, the second positioning convex bump 624 is, but not limited to, circular. Injection molding with a circular structure has the best part forming effect and structural strength. In addition, square shapes are also possible.

[0080] Correspondingly, the first positioning member includes four second positioning grooves 23 that mate with the four second positioning bumps 624. Each of the four second positioning grooves 23 is disposed in a rectangular pattern on the top surface of the pole piece 2. The insulating bracket 6 is supported directly on the top surface of the pole piece 2 by the support legs 623, with the second positioning bumps 624 inserted into the corresponding second positioning grooves 23. This also restricts the movement of the insulating bracket 6 along the plane of the pole piece 2.

[0081] Example 4

[0082] Referring to Figures 17 and 18, the difference between this embodiment and embodiment one or embodiment two or embodiment three is that: the limiting piece at the top of the insulating bracket 6 is set as a first limiting protrusion 612, and the first limiting protrusion 612 can be circular; the tensioning device 8 is rubber or silicone, and the tensioning device 8 made of rubber or silicone is set as a clamping ring 81 that matches the first limiting protrusion 612, and the clamping ring 81 is sleeved on the outside of the first limiting protrusion 612, and the lower end of the clamping ring 81 elastically rests on the top surface of the insulating bracket 6, and the upper end of the clamping ring 81 elastically rests on the inner top wall of the arc extinguishing cover 1 to limit the movement of the insulating bracket 6 in the vertical direction, and can also achieve the compression and fixation of the insulating bracket 6.

[0083] Example 5

[0084] Referring to Figures 19 and 20 , this embodiment differs from the first, second, or third embodiments in that the limiting member on the top of the insulating support 6 is provided as a first limiting protrusion 612, which may be circular. The tensioning device 8 is made of rubber or silicone and is provided as a clamping ring 81. Furthermore, a limiting groove 613 is provided on the top of the insulating support 6, with the first limiting protrusion 612 located in the center. The diameter of the limiting groove 613 matches the outer diameter of the clamping ring 81, and the diameter of the first limiting protrusion 612 matches the inner diameter of the clamping ring 81. The clamping ring 81 is positioned within the limiting groove 613 and sleeved around the first limiting protrusion 612. The upper end of the clamping ring 81 elastically abuts against the inner top wall of the arc extinguishing hood 1, similarly limiting the vertical movement of the insulating support 6 and achieving a compressed and fixed position of the insulating support 6. This solution achieves a better positioning effect for the clamping ring 81 than the fourth embodiment.

[0085] Example 6

[0086] Referring to Figures 21 and 22, the difference between this embodiment and Example 5 is that the limiting piece on the top of the insulating bracket 6 is set as a limiting groove 613, there is no first limiting protrusion 612 on the top of the insulating bracket 6, the limiting groove 613 matches the size of the clamping ring 81, the clamping ring 81 is positioned in the limiting groove 613, and the upper end of the clamping ring 81 elastically rests on the inner top wall of the arc extinguishing cover 1, which can also limit the movement of the insulating bracket 6 in the vertical direction, thereby realizing the clamping and fixation of the insulating bracket 6.

[0087] Example 7

[0088] Referring to Figures 23 and 24 , this embodiment differs from the first, second, or third embodiments in that the tensioning device 8 is made of rubber or silicone and is configured as a compression block. The compression block may be cylindrical, with a blind hole 82 at its bottom that matches the retaining ring 611. The tensioning device 8 is placed on the top surface of the insulating support 6 and is positioned by the blind hole 82 and the retaining ring 611. The upper end of the tensioning device 8 elastically abuts against the inner top wall of the arc extinguishing hood 1, similarly limiting the vertical movement of the insulating support 6 and thereby compressing and securing the insulating support 6.

[0089] Example 8

[0090] Referring to Figures 25 to 27 , this embodiment differs from the first, second, or third embodiments in that: the top of the insulating support 6 lacks a limit member, and its top surface is a flat surface; the inner top wall of the arc extinguishing hood 1 is provided with a second limiting protrusion 101 that matches the through-hole of the clamping ring 81. The tensioning device 8 is placed on the top surface of the insulating support 6 and is positioned by the through-hole and the second limiting protrusion 101. The lower end of the clamping ring 81 elastically abuts the top surface of the insulating support 6, and the upper end of the clamping ring 81 elastically abuts the inner top wall of the arc extinguishing hood 1, similarly limiting the vertical movement of the insulating support 6 and achieving compression and fixation of the insulating support 6.

[0091] In summary, the relay of the present invention is achieved by integrally injecting the second magnetic conductor 5 into the insulating bracket 6, and using the first positioning member and the second positioning member to cooperate between the insulating bracket 6 and the magnetic pole piece 2 to achieve horizontal positioning of the insulating bracket 6. By arranging a tensioning device 8 between the insulating bracket 6 and the arc extinguishing cover 1, the insulating bracket 6 is fixed between the magnetic pole piece 2 and the arc extinguishing cover 1. Under the premise of ensuring that the anti-short circuit structure form and function remain unchanged, it can not only effectively isolate the high and low voltage ends and ensure good insulation withstand voltage performance, but also eliminate the riveting process of the traditional magnetic pole piece 2, eliminating the risk of damage caused by pressure riveting. The risk of air leakage due to damage to the pole piece 2 improves the qualification rate of the process, reduces the technical difficulty of the stamping process of the first positioning piece of the pole piece 2, reduces the cost of parts, and achieves the compression and fixation of the insulating bracket 6 by means of the welding and fixing process of the arc extinguishing cover 1 in the subsequent step, which can also shorten the production cycle and speed up production efficiency; at the same time, the arc extinguishing cover 1 presses the insulating bracket 6 on the pole piece 2 through the tensioning device 8, which can avoid the problem of damage to the arc extinguishing cover 1 or difficulty in controlling the compression accuracy due to rigid compression, and can also achieve reliable and stable compression and fixation of the insulating bracket 6. In addition, the second magnetic conductor 5 of the present invention is fixed to the insulating bracket 6 by integral injection molding, and no additional assembly is required between the two. The process is simple, the difficulty and cost of part forming are reduced, and the dimensional accuracy of the parts can be guaranteed. By adopting this technical solution, the present invention can quickly and reliably install anti-short-circuit components and can realize automated mass production.

[0092] In the above description, many specific details are set forth in order to fully understand the present invention. However, the above description is only a preferred embodiment of the present invention. The present invention can be implemented in many other ways different from those described herein, so the present invention is not limited to the specific implementation disclosed above. At the same time, any person skilled in the art can make many possible changes and modifications to the technical solution of the present invention using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A relay, comprising an arc extinguishing hood (1), a magnetic pole piece (2) sealed and connected to the arc extinguishing hood (1), and an insulating bracket (6) accommodated in the arc extinguishing hood (1), wherein the insulating bracket (6) is mounted on the magnetic pole piece (2), characterized in that: The relay further comprises a tensioning device (8) located between the arc extinguishing hood (1) and the insulating support (6), and the arc extinguishing hood (1) is used to press the insulating support (6) through the tensioning device (8).

2. The relay according to claim 1, characterized in that: The tensioning device (8) is any one of elastic silicone, rubber, spring, belt, reed, elastic gasket or a combination thereof.

3. The relay according to claim 2, characterized in that: A limiting piece is provided on the top of the insulating bracket (6); one end of the tensioning device (8) is matched and connected to the limiting piece; and the other end of the tensioning device (8) is placed against the inner wall of the arc extinguishing cover (1).

4. The relay according to claim 3, characterized in that: The limiting piece at the top of the insulating support (6) is configured as a limiting convex ring (611); the tensioning device (8) is made of rubber or silicone; the tensioning device (8) made of rubber or silicone is provided with a through hole matching the limiting convex ring (611) and is sleeved on the limiting convex ring (611); the other end of the tensioning device (8) made of rubber or silicone is elastically placed against the inner wall of the arc extinguishing cover (1) to limit the movement of the insulating support (6) in the vertical direction.

5. The relay according to claim 3, characterized in that: The limiting piece at the top of the insulating bracket (6) is set as a first limiting protrusion (612), the tensioning device (8) is rubber or silicone, the tensioning device (8) made of rubber or silicone is set as a clamping ring (81) matching the first limiting protrusion (612), the clamping ring (81) is sleeved outside the first limiting protrusion (612), and the other end of the tensioning device (8) made of rubber or silicone is elastically placed on the inner wall of the arc extinguishing cover (1) to limit the movement of the insulating bracket (6) in the vertical direction.

6. The relay according to claim 1, characterized in that: The magnetic pole piece (2) is provided with a first positioning member in the direction toward the insulating bracket (6), and the insulating bracket (6) is provided with a second positioning member matching the first positioning member to limit the movement of the insulating bracket (6) along the plane where the magnetic pole piece (2) is located.

7. The relay according to claim 6, characterized in that: One of the first positioning member and the second positioning member comprises a first positioning convex bump (21), and the other comprises a first positioning groove (621) matching the first positioning convex bump (21), and the first positioning convex bump (21) and the first positioning groove (621) are plug-fitted.

8. The relay according to claim 7, characterized in that: The insulating bracket (6) is provided with a main body (61) and a support portion (62) integrally connected to the main body (61); the main body (61) is provided with a second magnetic conductor (5); and the tensioning device (8) is in contact with the main body (61).

9. The relay according to claim 8, characterized in that: The relay further comprises a push rod (10), a support frame (11), an insulating base (12) and a moving contact piece (3); the upper end of the push rod (10) and the lower end of the support frame (11) are integrally injection-molded in the insulating base (12); the moving contact piece (3) is upwardly abutted against the top of the support frame (11); the insulating bracket (6) is mounted on the support frame (11); the insulating bracket (6) comprises supporting parts (62) extending downward from both sides of the main body (61); the supporting parts (62) are located outside the two long sides of the moving contact piece (3); and the first positioning groove (621) is provided at the bottom end of the supporting part (62).

10. The relay according to claim 9, characterized in that: The first positioning member comprises at least two first positioning convex bumps (21) arranged on the top surface of the magnetic pole piece (2), and the second positioning member comprises at least two first positioning grooves (621) arranged on the bottom surface of the support portion (62), and the first positioning convex bumps (21) are inserted into the corresponding first positioning grooves (621).

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