Relay

Abstract

The invention discloses a relay which comprises an arc extinguishing cover, a magnetic pole piece connected to the arc extinguishing cover in a sealed mode and an insulating support contained in the arc extinguishing cover, the insulating support is installed on the magnetic pole piece, and the relay further comprises a tensioning device located between the arc extinguishing cover and the insulating support. And the arc extinguishing cover is used for pressing the insulating bracket through the tensioning device. According to the relay, the tensioning device is arranged between the insulation support and the arc extinguishing cover, the insulation support is fixed between the magnetic pole piece and the arc extinguishing cover, the step of implementing a riveting process on the magnetic pole piece in a traditional mode is omitted, the production takt is shortened, and the production efficiency is improved.

Description

Technical Field

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

[0002] In the field of high-voltage DC relays, the operating conditions of products often require the relay to have the ability to withstand short-term large currents without contact repulsion. To improve this performance of the relay, high-voltage DC relays generally contain an anti-short-circuit structure. Currently, the anti-short-circuit structures in high-voltage DC relays on the market mainly have two armatures arranged on the upper and lower sides of the moving contact piece. The lower armature is fixed to the moving contact piece, and the upper armature needs to be fixed separately and kept at a certain distance from the lower armature. After the moving contact piece and the static contact are in contact and conducting, the two armatures are magnetized by the magnetic field generated when the current flows through the moving contact piece, so that a suction force is generated between the two armatures and acts on the moving contact piece, thereby having an upward compensation force on the moving contact piece to overcome the electric repulsion force it receives, ensuring that it will not be repelled when carrying a large current.

[0003] Currently, the conventional methods for the installation structure of the upper armature can be divided into two types. One is to support and fix the upper armature on the pole piece through a metal bracket, usually fixed by riveting; since the upper armature is fixed to the moving contact piece and belongs to the high-voltage part, and the lower armature is fixed to the pole piece through a metal bracket and belongs to the low-voltage part, and the distance between the upper and lower armatures is small, there is a risk of high-voltage breakdown in this scheme. In addition, the thin wall of the pole piece may be damaged due to riveting, resulting in a risk of air leakage (the arc extinguishing chamber of a high-voltage DC relay is usually filled with inert gas, and the airtightness needs to be ensured). Another scheme is to braze or bond the upper armature to the ceramic cover. This scheme requires brazing and bonding processes, with high operation difficulty, high risk of the upper armature falling off, and difficult control of the height dimension of the ceramic cover, making it difficult to control the distance between the upper and lower armatures and affecting the anti-short-circuit performance of the product. Summary of the Invention

[0004] The problem to be solved by the present invention is to provide a relay to overcome the defects of unreliable high-voltage and low-voltage insulation, air leakage risk, high cost, and complex production process of existing relays with anti-short-circuit structures.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a relay, including: an arc extinguishing cover, a pole piece hermetically connected to the arc extinguishing cover, and an insulating bracket accommodated in the arc extinguishing cover. The insulating bracket is installed on the pole piece. The relay further includes a tensioning device located between the arc extinguishing cover and the insulating bracket, and the arc extinguishing cover presses the insulating bracket through the tensioning device.

[0006] 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 washer.

[0007] As a further improvement of the present invention, a limiting member is provided at the top of the insulating bracket, one end of the tensioning device is connected to the limiting member in a matching manner, and the other end of the tensioning device abuts against the inner wall of the arc extinguishing cover.

[0008] As a further improvement of the present invention, the limiting member at the top of the insulating bracket is provided 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 elastically abuts against the inner wall of the arc extinguishing cover to limit the movement of the insulating bracket in the vertical direction.

[0009] As a further improvement of the present invention, the limiting member at the top of the insulating bracket is provided as a first limiting convex block, the tensioning device is rubber or silicone, the tensioning device made of rubber or silicone is provided as a pressing ring matching the first limiting convex block, the pressing ring is sleeved outside the first limiting convex block, and the other end of the tensioning device made of rubber or silicone elastically abuts 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, a first positioning member is provided in the direction of the magnetic pole piece facing 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 in the direction of the plane where the magnetic pole piece is located.

[0011] 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 and the first positioning groove are inserted and matched.

[0012] As a further improvement of the present invention, the insulating bracket is provided with a main body portion and a supporting portion integrally connected to the main body portion, a second magnetic conductor is installed on the main body portion, and the tensioning device abuts against the main body portion.

[0013] As a further improvement of the present invention, the relay further 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 into the insulating base. The moving contact piece abuts upward against the top of the support frame. The insulating bracket is disposed on the support frame. The insulating bracket includes support portions respectively extending downward from both sides of the main body portion. The support portions are located outside the two long sides of the moving contact piece. The first positioning groove is disposed at the bottom end of the support portion.

[0014] As a further improvement of the present invention, the first positioning member includes at least two first positioning protrusions disposed on the top surface of the magnetic pole piece, and the second positioning member includes at least two first positioning grooves disposed on the bottom surface of the support portion. The first positioning protrusions are inserted into the corresponding first positioning grooves.

[0015] The beneficial effects of the present invention are:

[0016] The present invention provides a relay. By providing a tensioning device between the insulating bracket and the arc extinguishing cover, the insulating bracket is fixed between the magnetic pole piece and the arc extinguishing cover, eliminating the steps of implementing riveting processes on the magnetic pole piece in the traditional method, shortening the production cycle, and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the front view of the first embodiment of the relay of the present invention;

[0018] Figure 2 is the cross-sectional view of the first embodiment of the relay of the present invention;

[0019] Figure 3 is the exploded view of the first embodiment of the relay of the present invention;

[0020] Figure 4 is the perspective view of the first embodiment of the relay of the present invention after removing the arc extinguishing cover;

[0021] Figure 5 is the exploded view of the magnetic pole piece, the insulating bracket and the tensioning device in the first embodiment of the relay of the present invention;

[0022] Figure 6 is the perspective view of the insulating bracket in the first embodiment of the relay of the present invention;

[0023] Figure 7 is the bottom view of the insulating bracket and the second magnetic conductor in the first embodiment of the relay of the present invention;

[0024] Figure 8 is the cross-sectional view of the insulating bracket and the second magnetic conductor in the first embodiment of the relay of the present invention;

[0025] Figure 9Stereogram of the second magnetic conductor in the first embodiment of the relay of the present invention;

[0026] Figure 10 Front view of the second magnetic conductor in the first embodiment of the relay of the present invention;

[0027] Figure 11 Stereogram of the moving contact piece and the push rod assembly in the first embodiment of the relay of the present invention;

[0028] Figure 12 Exploded view of the moving contact piece and the push rod assembly in the first embodiment of the relay of the present invention;

[0029] Figure 13 Stereogram of the assembled insulating bracket and magnetic pole piece in the second embodiment of the relay of the present invention;

[0030] Figure 14 Exploded view of the insulating bracket and magnetic pole piece in the second embodiment of the relay of the present invention;

[0031] Figure 15 Stereogram of the insulating bracket and the second magnetic conductor in the second embodiment of the relay of the present invention;

[0032] Figure 16 Exploded view of the insulating bracket and magnetic pole piece in the third embodiment of the relay of the present invention;

[0033] Figure 17 Cross-sectional view of the insulating bracket and the pressing ring in the fourth embodiment of the relay of the present invention;

[0034] Figure 18 Stereogram of the insulating bracket in the fourth embodiment of the relay of the present invention;

[0035] Figure 19 Cross-sectional view of the arc extinguishing cover, insulating bracket and pressing ring in the fifth embodiment of the relay of the present invention;

[0036] Figure 20 Stereogram of the insulating bracket in the fifth embodiment of the relay of the present invention;

[0037] Figure 21 Cross-sectional view of the arc extinguishing cover, insulating bracket and pressing ring in the sixth embodiment of the relay of the present invention;

[0038] Figure 22 Stereogram of the insulating bracket in the sixth embodiment of the relay of the present invention;

[0039] Figure 23 Cross-sectional view of the arc extinguishing cover, insulating bracket and tensioning device in the seventh embodiment of the relay of the present invention;

[0040] Figure 24 Stereogram of the tensioning device in the seventh embodiment of the relay of the present invention;

[0041] Figure 25 This 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;

[0042] Figure 26 This is a perspective view of the arc extinguishing cover in the eighth embodiment of the relay of the present invention;

[0043] Figure 27 This is a perspective view of the insulating bracket in the eighth embodiment of the relay of the present invention.

[0044] The following description is made in conjunction with the accompanying drawings:

[0045] 1. Arc extinguishing cover; 101. Second limiting convex block; 2. Magnetic pole piece; 21. First positioning convex bump; 22. Through hole; 23. Second positioning groove; 3. Moving contact piece; 31. Positioning groove; 4. First magnetic conductor; 41. Bottom plate; 411. Positioning table; 42. Side plate; 5. Second magnetic conductor; 51. Inclined surface; 52. Groove; 53. Glue-releasing groove; 6. Insulating bracket; 61. Main body part; 611. Limiting convex ring; 612. First limiting convex block; 613. Limiting groove; 62. Supporting part; 621. First positioning groove; 622. Supporting foot; 623. Supporting leg; 624. Second positioning convex bump; 7. Moving iron core; 8. Tensioning device; 81. Compression 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. Specific embodiments

[0046] The following describes in detail the preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0047] Embodiment 1

[0048] Refer to Figures 1 to 12 , the present invention provides a relay, including an arc extinguishing cover 1, a contact assembly, a short-circuit prevention assembly, a push rod assembly and an electromagnetic mechanism. The contact assembly includes a moving contact piece 3 and a static contact 9. In this embodiment, one moving contact piece 3 and two static contacts 9 are taken as examples for description, but it does not mean that the number of the moving contact piece 3 and the static contact 9 is limited thereto. For example, in other embodiments, it is also allowed to set two moving contact pieces 3 and four static contacts 9 and other situations.

[0049] Refer to Figures 1 to 3 , two static contacts 9 are welded side by side and spaced apart at the top of the arc extinguishing cover 1, and the lower ends of the two static contacts 9 both extend into the arc extinguishing cover 1. The moving contact piece 3 and the short-circuit prevention assembly are both accommodated in the arc extinguishing cover 1, and both ends of the moving contact piece 3 are located directly below the two static contacts 9. The push rod assembly is connected between the moving contact piece 3 and the electromagnetic mechanism, and the electromagnetic mechanism is used to drive the moving contact piece 3 to move up and down through the push rod assembly to connect or disconnect from the two static contacts 9.

[0050] Refer to Figures 2 to 4 , the short - circuit resistant component 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 moving contact piece 3, the second magnetic conductor 5 is fixed to the insulating bracket 6 and is spaced relatively above the first magnetic conductor 4. At the same time, the second magnetic conductor 5 is also above the moving contact piece 3 and is located between two static contact heads 9. When the electromagnetic mechanism drives the moving contact piece 3 to move upward through the push rod assembly so that the moving contact piece 3 bridges between the two static contact heads 9, the first magnetic conductor 4 also moves synchronously with the moving contact piece 3 and there is a gap between the first magnetic conductor 4 and the second magnetic conductor 5. When current flows through the moving contact piece 3, a spiral magnetic field will be generated, magnetizing the first magnetic conductor 4 and the second magnetic conductor 5, so that an attractive force is generated between the first magnetic conductor 4 and the second magnetic conductor 5 and acts on the moving contact piece 3, providing an upward compensation force to the moving contact piece 3 to overcome the electric repulsive force it receives, thereby improving the short - circuit resistant ability.

[0051] Among them, the first magnetic conductor 4 and the second magnetic conductor 5 can be made of metals such as iron, nickel or their alloys.

[0052] Furthermore, the electromagnetic mechanism includes a magnetic circuit assembly. The magnetic circuit assembly includes a magnetic pole piece 2. The bottom of the arc extinguishing cover 1 is hermetically welded to the top of the magnetic pole piece 2 through a connecting ring 15. The magnetic pole piece 2 is provided with a first positioning member towards the insulating bracket 6, and the insulating bracket 6 is provided with a second positioning member matching the first positioning member. The insulating bracket 6 is supported on the magnetic pole piece 2 and is used in cooperation with the first positioning member and the second positioning member to limit the movement of the insulating bracket 6 along the plane where the magnetic pole piece 2 is located. The first positioning member has the functions of guiding and positioning, so that the insulating bracket 6 can be accurately installed on the magnetic pole piece 2. The arc extinguishing cover 1 presses the insulating bracket 6 against the magnetic pole piece 2.

[0053] It should be noted that there are various ways to press the arc extinguishing cover 1 against the insulating bracket 6. However, if the arc extinguishing cover 1 directly or indirectly presses the insulating bracket 6 using a rigid member, the following defects will exist: First, the arc extinguishing cover 1 is usually made of ceramic material, and this rigid pressing may cause damage to the ceramic arc extinguishing cover 1; Second, the height dimension of the arc extinguishing cover 1 is difficult to control, resulting in poor control of the pressing accuracy of the insulating bracket 6, often causing insufficient pressing or over - pressing. In response to this, in the present invention, a tensioning device 8 is installed between the arc extinguishing cover 1 and the insulating bracket 6, and the arc extinguishing cover 1 presses the insulating bracket 6 against the magnetic pole piece 2 through the tensioning device 8, so that the aforementioned existing defects can be solved and reliable and stable pressing and fixing of the insulating bracket 6 can be achieved.

[0054] Optionally, the tensioning device 8 is made of an elastic material. The elastic material mainly includes any one or a combination of elastic silicone, rubber, spring, belt, reed, elastic washer. In this embodiment, preferably, the tensioning device 8 is rubber or silicone.

[0055] Further, a limiting member is provided at the top of the insulating bracket 6. One end of the tensioning device 8 is connected to the limiting member in a matching manner, and the other end of the tensioning device 8 abuts against the inner wall of the arc extinguishing cover 1.

[0056] Specifically, as Figure 2 and Figure 5 shown, the limiting member at the top of the insulating bracket 6 is set as a limiting convex ring 611, and the tensioning device 8 made of rubber or silica gel is set as a pressing ring 81. The pressing ring 81 is provided with a through hole matching the limiting convex ring 611 and sleeved on the limiting convex ring 611. The diameter of the through hole is slightly larger than the diameter of the limiting convex ring 611. And setting the tensioning device 8 as an elastic pressing ring 81 can provide a deformation space for the deformation of the pressing ring 81 after the ceramic cover is pressed. Thus, the positioning of the pressing ring 81 is realized, and the other end of the pressing ring 81 made of rubber or silica gel elastically abuts against the inner wall of the arc extinguishing cover 1 to limit the movement of the insulating bracket 6 in the vertical direction.

[0057] In the present invention, the second magnetic conductor 5 is fixedly installed through the insulating bracket 6, realizing the high-voltage and low-voltage insulation between the moving contact piece 3, the first magnetic conductor 4, the static contact 9 and other high-voltage ends and the low-voltage end of the magnetic pole piece 2. Even if breakdown occurs between the first magnetic conductor 4 and the second magnetic conductor 5, the insulating bracket 6 can isolate the high-voltage and low-voltage ends to ensure good insulation withstand voltage performance; at the same time, the first positioning member and the second positioning member are used in cooperation to realize the 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, canceling the riveting process of the traditional magnetic pole piece 2, eliminating the air leakage risk caused by the damage of the magnetic pole piece 2 due to press riveting, improving the qualification rate of the process, reducing the technical difficulty of the stamping process of the first positioning member of the magnetic pole piece 2, reducing the part cost, and realizing the pressing and fixing of the insulating bracket 6 by means of the subsequent welding and fixing process of the arc extinguishing cover 1, which can also shorten the production cycle and improve the production efficiency.

[0058] Referring to Figures 4 to 6 , the insulating bracket 6 is in an inverted U shape, which is provided with a main body portion 61 and two supporting portions 62. The limiting convex ring 611 is arranged at the center position of the top surface of the main body portion 61, and the tensioning device 8 abuts against the main body portion 61. The main body portion 61 is located between the two static contacts 9, and the second magnetic conductor 5 and the insulating bracket 6 are integrally injection-molded and fixed to the main body portion 61. The two supporting portions 62 are integrally connected to both ends of the main body portion 61, and the two supporting portions 62 are located outside the two long sides of the moving contact piece 3. The second positioning member is arranged at the lower end of the supporting portion 62.

[0059] Further, 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 inserted and matched to realize positioning.

[0060] Specifically, as Figure 5 shown, in this embodiment, the first positioning member includes but is not limited to four first positioning convex hulls 21. The four first positioning convex hulls 21 are all arranged on the top surface of the magnetic pole piece 2 and are distributed in a rectangular shape; the first positioning convex hulls 21 can be integrally formed on the magnetic pole piece 2 by processes such as stamping. It can be understood that the number of the first positioning convex hulls 21 can be correspondingly configured according to needs, but at least two should be provided to meet the positioning requirements. Preferably, the first positioning convex hulls 21 are in a cylindrical shape but are not limited to this, and shapes such as square columns are also applicable. According to the processing method of the parts, stamping in a cylindrical shape has the best part forming effect and structural strength.

[0061] As Figure 4 and Figure 6 shown, notches are provided at the middle positions of the lower parts of the two support parts 62 to reduce the material usage amount, and support legs 623 are formed on both sides of the notch of the support part 62. Each support leg 623 horizontally extends outward with a support foot 622, and the extending directions of the two support feet 622 on the same support part 62 are opposite. The four support feet 622 all support on the top surface of the magnetic pole piece 2. Correspondingly, the second positioning member includes but is not limited to four first positioning grooves 621 that are in one-to-one correspondence with the four first positioning convex hulls 21. The first positioning grooves 621 are respectively arranged on the side surface of the support foot 622 facing away from the support part 62. The first positioning convex hulls 21 fall into the corresponding first positioning grooves 621, thereby realizing the horizontal positioning of the insulating bracket 6.

[0062] In this embodiment, the first positioning grooves 621 are all semi-circular grooves, which can provide a more generous fitting method when being inserted and fitted with the first positioning convex hulls 21, facilitating assembly. Of course, in other embodiments, other forms of the first positioning grooves 621 or positioning holes penetrating the upper and lower surfaces of the support feet 622 can be adopted.

[0063] As one improvement of the present invention, the insulating bracket 6 is made of a plastic material, and the second magnetic conductor 5 and the insulating bracket 6 are integrally injection-molded. No additional assembly is required between the two, the process is simple, the part forming difficulty and cost are reduced, and the part dimension accuracy can be guaranteed.

[0064] As Figure 7 and Figure 8 shown, the bottom surface of the second magnetic conductor 5 is exposed from the bottom surface of the main body part 61 of the insulating bracket 6 to ensure that a relatively large suction force can be generated between the second magnetic conductor 5 and the first magnetic conductor 4, thereby ensuring better short-circuit resistance.

[0065] Refer to Figure 6 , Figure 9 and Figure 10, the second magnetic conductor 5 is generally in a cuboid shape. The lower ends of the two opposite side faces facing the two supporting parts 62 are inclined towards each other, thereby forming two inclined surfaces 51 distributed in an inverted "V" shape. Both of the two inclined surfaces 51 are wrapped by the main body 61 of the insulating bracket 6. In the present invention, by setting the second magnetic conductor 5 into an inverted trapezoidal structure with a large upper end and a small lower end, in this way, the second magnetic conductor 5 will not fall off the insulating bracket 6, avoiding the risk of the second magnetic conductor 5 falling off due to large suction force and insufficient bonding strength of the adhesive surface.

[0066] Preferably, the included angle between the inclined surface 51 and the vertical plane is 1° to 2°.

[0067] It is worth mentioning that a groove 52 is provided on the top surface of the second magnetic conductor 5 for marking this surface upward. At the same time, through this groove 52, the contact area with the insulating bracket 6 can also be increased, increasing the bonding strength. In addition, glue grooves 53 are provided on both side surfaces of the second magnetic conductor 5 to further increase the contact area with the insulating bracket 6 and further increase the bonding strength.

[0068] Refer to Figure 11 and Figure 12 , the first magnetic conductor 4 is in a U shape, which is provided with a bottom plate 41 and two side plates 42 formed by bending the two ends of the bottom plate 41 upward. The bottom plate 41 abuts against the bottom surface of the moving contact piece 3, and is positioned by cooperating with a positioning groove 31 provided at the bottom of the moving contact piece 3 through a positioning platform 411 provided at the top of the bottom plate 41; the two side plates 42 wrap around both sides of the moving contact piece 3 and extend towards the direction of the second magnetic conductor 5. Among them, the positioning platform 411 and the positioning groove 31 can be but are not limited to circular structures.

[0069] 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 in the insulating base 12, and the insulating bracket 6 is erected 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 passes through the support frame 11 horizontally, and the two side plates 42 of the first magnetic conductor 4 respectively protrude upward from the avoidance windows 111 provided on both sides of the support frame 11. The two ends of the contact spring 13 are elastically abutted against the first magnetic conductor 4 and the insulating base 12 respectively, and make the moving contact piece 3 abut against the top of the support frame 11 upward.

[0070] The electromagnetic mechanism of the present invention adopts the existing conventional technology, which is not an improvement point of this application. As Figure 2 and Figure 3As shown, in this embodiment, the electromagnetic mechanism further includes a coil winding (not shown in the figure), a moving iron core 7, a static iron core 16, and a sleeve 14, all of which are arranged below the pole piece 2. The static iron core 16 is coaxially and fixedly connected to the through hole 22 of the pole piece 2. The moving iron core 7 is relatively spaced below the static iron core 16 and fixedly connected to the push rod 10. A return spring is installed between the moving iron core 7 and the static iron core 16. The sleeve 14 is cup-shaped, and a flange is provided at the edge of its upper port. The sleeve 14 is sleeved outside the moving iron core 7 and the static iron core 16 and is hermetically welded to the bottom surface of the pole piece 2 through the flange; the coil winding is sleeved outside the sleeve 14. On the one hand, the sleeve 14 plays a guiding role in the movement of the moving iron core 7. On the other hand, it cooperates with the pole piece 2, the connecting ring 15, and the arc extinguishing cover 1 to form a sealed cavity for filling inert gases such as nitrogen, sulfur hexafluoride, etc.

[0071] When the coil winding is energized, the magnetized moving iron core 7 is attracted by the static iron core 16 and moves upward, and finally attracts and adheres to the bottom of the static iron core 16. During this process, the moving iron core 7 pushes the moving contact 3 upward through the push rod assembly, so that the moving contact 3 contacts and conducts with the two static contacts 9; at the same time, current flows through the moving contact 3 to generate a magnetic field, magnetize the first magnetic conductor 4 and the second magnetic conductor 5, so that a suction force is generated between the first magnetic conductor 4 and the second magnetic conductor 5, providing an upward compensation force for the moving contact 3 to overcome the electric repulsive force it receives, thereby improving the short-circuit resistance. When the coil winding is de-energized, the magnetic suction force between the moving iron core 7 and the static iron core 16 disappears. Under the action of the return spring, the moving iron core 7 moves downward and drives the moving contact 3 to break away from the two static contacts 9.

[0072] Embodiment Two

[0073] Refer to Figures 13 to 15 , the difference between this embodiment and Embodiment One is that the positioning method between the insulating bracket 6 and the pole piece 2 is adjusted. Specifically, two support legs 623 are also provided on each of the two support portions 62 of the insulating bracket 6, but there are no extended support feet 622 on the support 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 support legs 623. It can be understood that the number of the first positioning grooves 621 can be configured accordingly according to needs, but at least two should be provided to meet the positioning requirements. Preferably, the first positioning grooves 621 are but are not limited to circular. Injection molding with a circular structure has the best part forming effect and structural strength. In addition, shapes such as square are also acceptable.

[0074] Correspondingly, the first positioning member includes four first positioning protrusions 21 that are in one-to-one correspondence with the four first positioning grooves 621. The four first positioning protrusions 21 are all provided on the top surface of the pole piece 2 and are distributed in a rectangular shape. The first positioning protrusions 21 can be integrally formed on the pole piece 2 by processes such as stamping.

[0075] The insulating bracket 6 is directly supported on the top surface of the magnetic pole piece 2 through the support legs 623, and the first positioning convex hull 21 is inserted into the corresponding first positioning groove 621, so as to restrict the movement of the insulating bracket 6 in the direction of the plane where the magnetic pole piece 2 is located.

[0076] Compared with the first embodiment, this embodiment has the advantage of reducing the plastic cost of the insulating bracket 6.

[0077] Embodiment Three

[0078] Refer 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, two support legs 623 are also provided on each of the two support portions 62 of the insulating bracket 6, but there are no extended support feet 622 on the support legs 623. The second positioning member includes but is not limited to four second positioning convex hulls 624, and the four second positioning convex hulls 624 are respectively arranged on the bottom surfaces of the four support legs 623. It can be understood that the number of the second positioning convex hulls 624 can be configured accordingly as needed, but at least two should be provided to meet the positioning requirements. Preferably, the second positioning convex hull 624 is 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 acceptable.

[0079] Correspondingly, the first positioning member includes four second positioning grooves 23 that are in one-to-one correspondence with the four second positioning convex hulls 624. The four second positioning grooves 23 are all arranged on the top surface of the magnetic pole piece 2 and are distributed in a rectangular shape. The insulating bracket 6 is directly supported on the top surface of the magnetic pole piece 2 through the support legs 623, and the second positioning convex hull 624 is inserted into the corresponding second positioning groove 23, which can also restrict the movement of the insulating bracket 6 in the direction of the plane where the magnetic pole piece 2 is located.

[0080] Embodiment Four

[0081] Refer to Figure 17 and Figure 18 , the difference between this embodiment and the first embodiment or the second embodiment or the third embodiment is that the limiting member at the top of the insulating bracket 6 is set as the first limiting convex block 612, and the first limiting convex block 612 can be circular; the tensioning device 8 is made of rubber or silica gel, and the tensioning device 8 made of rubber or silica gel is set as a pressing ring 81 that is matched with the first limiting convex block 612. The pressing ring 81 is sleeved outside the first limiting convex block 612, and the lower end of the pressing ring 81 elastically abuts against the top surface of the insulating bracket 6, and the upper end of the pressing ring 81 elastically abuts against the inner top wall of the arc extinguishing cover 1 to restrict the movement of the insulating bracket 6 in the vertical direction, and can also realize the pressing and fixing of the insulating bracket 6.

[0082] Embodiment Five

[0083] Refer toFigure 19 and Figure 20 In this embodiment, the difference from Embodiment 1, Embodiment 2, or Embodiment 3 is as follows: The limiting member at the top of the insulating bracket 6 is provided as a first limiting convex block 612, and the first limiting convex block 612 can be circular; the tensioning device 8 is made of rubber or silica gel, and the tensioning device 8 made of rubber or silica gel is provided as a pressing ring 81. In addition, a limiting groove 613 is recessed at the top of the insulating bracket 6, and the first limiting convex block 612 is located in the middle of the limiting groove 613. The diameter of the limiting groove 613 matches the outer diameter of the pressing ring 81, and the diameter of the first limiting convex block 612 matches the inner diameter of the pressing ring 81. The pressing ring 81 is positioned in the limiting groove 613 and sleeved on the first limiting convex block 612, and the upper end of the pressing ring 81 elastically abuts against 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 and realize the pressing and fixing of the insulating bracket 6. This solution has a better positioning effect on the pressing ring 81 compared with Embodiment 4.

[0084] Embodiment 6

[0085] Refer to Figure 21 and Figure 22 In this embodiment, the difference from Embodiment 5 is as follows: The limiting member at the top of the insulating bracket 6 is provided as a limiting groove 613, there is no first limiting convex block 612 at the top of the insulating bracket 6, the limiting groove 613 matches the size of the pressing ring 81, the pressing ring 81 is positioned in the limiting groove 613, and the upper end of the pressing ring 81 elastically abuts against 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 and realize the pressing and fixing of the insulating bracket 6.

[0086] Embodiment 7

[0087] Refer to Figure 23 and Figure 24 In this embodiment, the difference from Embodiment 1, Embodiment 2, or Embodiment 3 is as follows: The tensioning device 8 is made of rubber or silica gel, and the tensioning device 8 made of rubber or silica gel is provided as a pressing block. The pressing block can be cylindrical, and a blind hole 82 matching the limiting convex ring 611 is provided at its bottom. The tensioning device 8 is placed on the top surface of the insulating bracket 6 and is positioned through the cooperation of the blind hole 82 and the limiting convex ring 611. The upper end of the tensioning device 8 elastically abuts against 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 and realize the pressing and fixing of the insulating bracket 6.

[0088] Embodiment 8

[0089] Refer to Figures 25 to 27, The difference between this embodiment and Embodiment 1, Embodiment 2 or Embodiment 3 lies in that: there is no limiting member at the top of the insulating bracket 6, and its top surface is a flat surface; the inner top wall of the arc extinguishing cover 1 is provided with a second limiting protrusion 101 that matches the through hole of the pressing ring 81. The tensioning device 8 is placed on the top surface of the insulating bracket 6 and is positioned through the cooperation of the through hole and the second limiting protrusion 101. The lower end of the pressing ring 81 elastically abuts against the top surface of the insulating bracket 6, and the upper end of the pressing ring 81 elastically abuts against 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 and realize the pressing and fixing of the insulating bracket 6.

[0090] In summary, for the relay of the present invention, by integrally injecting the second magnetic conductor 5 into the insulating bracket 6, the first positioning member and the second positioning member are used in cooperation between the insulating bracket 6 and the pole piece 2 to realize the horizontal positioning of the insulating bracket 6. By arranging the tensioning device 8 between the insulating bracket 6 and the arc extinguishing cover 1, the insulating bracket 6 is fixed between the pole piece 2 and the arc extinguishing cover 1. On the premise of ensuring that the anti-short-circuit structure form and function remain unchanged, not only can the high-voltage and low-voltage ends be effectively isolated to ensure good insulation and withstand voltage performance, but also the riveting process of the traditional pole piece 2 is cancelled, eliminating the air leakage risk caused by the pole piece 2 being damaged due to press riveting, improving the qualification rate of the process, reducing the technical difficulty of the stamping process of the first positioning member of the pole piece 2, reducing the part cost, and realizing the pressing and fixing of the insulating bracket 6 by means of the subsequent welding and fixing process of the arc extinguishing cover 1, which can also shorten the production cycle and improve the 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 not only avoid the problems of the arc extinguishing cover 1 being damaged due to rigid pressing or the pressing accuracy being difficult to control, but also realize the reliable and stable pressing and fixing of the insulating bracket 6. In addition, the second magnetic conductor 5 of the present invention is fixed to the insulating bracket 6 by means of integral injection molding, and no additional assembly is required between the two, the process is simple, reducing the part forming difficulty and cost, and ensuring the part size accuracy. By adopting this technical solution, the present invention can quickly and reliably install the anti-short-circuit component and realize automated batch production.

[0091] In the above description, many specific details are set forth in order to provide a thorough understanding of the present invention. However, the above description is only a preferred embodiment of the present invention, and the present invention can be implemented in many other ways different from those described herein. Therefore, the present invention is not limited by the specific embodiments 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 by 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 with equivalent changes. All simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the protection of the technical solution of the present invention.

Claims

1. A relay, comprising an arc extinguishing cover (1), a magnetic pole piece (2) hermetically connected to the arc extinguishing cover (1), and an insulating bracket (6) accommodated in the arc extinguishing cover (1), the insulating bracket (6) being mounted on the magnetic pole piece (2). Characterized in that: The relay further includes a tensioning device (8) located between the arc extinguishing cover (1) and the insulating bracket (6), and the arc extinguishing cover (1) presses the insulating bracket (6) through the tensioning device (8).

2. The relay according to claim 1, Characterized in that: The tensioning device (8) is any one or a combination of elastic silica gel, rubber, spring, belt, reed, elastic washer, etc.

3. The relay according to claim 2, Characterized in that: A limiting member is provided at the top of the insulating bracket (6), one end of the tensioning device (8) is connected to the limiting member in a matching manner, and the other end of the tensioning device (8) abuts against the inner wall of the arc extinguishing cover (1).

4. The relay according to claim 3, Characterized in that: The limiting member at the top of the insulating bracket (6) is provided as a limiting convex ring (611), the tensioning device (8) is rubber or silica gel, and the rubber or silica gel tensioning device (8) is provided with a through hole matching the limiting convex ring (611) and is sleeved on the limiting convex ring (611), and the other end of the rubber or silica gel tensioning device (8) elastically abuts against the inner wall of the arc extinguishing cover (1) to limit the movement of the insulating bracket (6) in the vertical direction.

5. The relay according to claim 3, Characterized in that: The limiting member at the top of the insulating bracket (6) is provided as a first limiting convex block (612), the tensioning device (8) is rubber or silica gel, the rubber or silica gel tensioning device (8) is provided as a pressing ring (81) matching the first limiting convex block (612), the pressing ring (81) is sleeved outside the first limiting convex block (612), and the other end of the rubber or silica gel tensioning device (8) elastically abuts against 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: A first positioning member is provided on the magnetic pole piece (2) facing 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) in the direction of 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 includes a first positioning convex bump (21), and the other includes a first positioning groove (621) matching the first positioning convex bump (21), and the first positioning convex bump (21) is inserted and matched with the first positioning groove (621).

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

9. The relay according to claim 8, wherein: The relay further includes 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) abuts upward against the top of the support frame (11). The insulating support (6) is erected on the support frame (11). The insulating support (6) includes support portions (62) respectively extending downward from both sides of the main body portion (61). The support portions (62) are located outside the two long sides of the moving contact piece (3). The first positioning groove (621) is provided at the bottom end of the support portion (62).

10. The relay according to claim 9, wherein: The first positioning member includes at least two first positioning protrusions (21) provided on the top surface of the magnetic pole piece (2). The second positioning member includes at least two first positioning grooves (621) provided on the bottom surface of the support portion (62). The first positioning protrusions (21) are inserted into the corresponding first positioning grooves (621).

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