Relay contact structure

Abstract

The application discloses a relay contact structure, which comprises a main static contact, a main active contact and a contact spring, the main static contact and the main active contact are arranged in vertical opposition, the contact spring is installed on the upper side of a push rod and can provide the main active contact with an upward elastic supporting force, and the main active contact can be attracted and connected with the main static contact or disconnected under the cooperation of the push rod and the contact spring; the relay contact structure further comprises an auxiliary static contact and an auxiliary active contact, the auxiliary static contact is positioned beside the main static contact, the auxiliary active contact is connected to the upper side of the push rod and is located below the auxiliary static contact at the same time, and the auxiliary active contact can be attracted and connected with the auxiliary static contact or disconnected under the drive of the push rod. The relay contact structure has very high feedback signal accuracy, reliable lead-out form and high assembly efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of relays, and particularly provides a relay contact structure. BACKGROUND

[0002] The existing ceramic sealed relays do not have auxiliary contacts. The relays with auxiliary contacts mostly use dry reed tubes as auxiliary contacts. The working principle of the dry reed tube auxiliary contact is that a magnetic field is generated by the coil to make the dry reed tube close, thereby realizing the monitoring of the relay product. However, the dry reed tube auxiliary contact cannot realize synchronous movement with the main contact, especially when the main contact is stuck or adhered, while the dry reed tube can still normally open and close due to the influence of the coil magnetic field. Therefore, the existing dry reed tube auxiliary contact cannot well reflect the actual working state of the main contact, and the accuracy of the feedback signal is poor.

[0003] In view of this, the present application is proposed. SUMMARY

[0004] In order to overcome the above-mentioned defects, the present application provides a relay contact structure. On the one hand, the auxiliary contact assembly can well reflect the actual working state of the main contact assembly, and has very high feedback signal accuracy. On the other hand, the lead-out form connection of the auxiliary contact assembly is reliable, and the assembly efficiency is high.

[0005] The technical scheme adopted by the present application to solve the technical problems is as follows: a relay contact structure, comprising a main static contact, a main active contact and a contact spring, the main static contact and the main active contact are arranged in vertical opposition, the contact spring is installed on the upper side of the push rod and can provide an upward elastic support force for the main active contact, and the main active contact can be attracted and connected or disconnected with the main static contact under the joint driving of the push rod and the contact spring; further comprising an auxiliary static contact and an auxiliary active contact, the auxiliary static contact is positioned beside the main static contact, the auxiliary active contact is connected to the upper side of the push rod and is located below the auxiliary static contact at the same time, and the auxiliary active contact can be attracted and connected or disconnected with the auxiliary static contact under the driving of the push rod.

[0006] As a further improvement of the present application, the auxiliary static contact is two, both of the auxiliary static contacts are vertically placed cylindrical structures and are also arranged in parallel and spaced apart;

[0007] The auxiliary active contact has a base body which is a curved long strip shape, and two contacts which are integrally formed on both ends of the length direction of the base body, the base body is connected to the upper side of the push rod, and the two contacts are located below the two auxiliary static contacts and can be attracted and connected or disconnected with the two auxiliary static contacts, respectively.

[0008] As a further improvement of the present application, a connecting assembly is further provided, which has a lower connecting base, a middle connecting piece and an upper connecting base, the lower connecting base is sleeved on the upper side of the push rod, the middle connecting piece is a reverse U-shaped structure, which is covered on the middle part of the active contact and connected with the lower connecting base, the upper connecting base is arranged on the outer surface of the top wall of the middle connecting piece, and the middle part of the base is embedded in the upper connecting base.

[0009] As a further improvement of the present application, the bottom side of the middle connecting piece is detachably connected with the lower connecting base; the upper connecting base is arranged on the outer surface of the top wall of the middle connecting piece, and the upper connecting base is also detachably connected with the top wall of the middle connecting piece.

[0010] As a further improvement of the present application, the middle connecting piece has two side walls and a top wall which is transversely and fixedly connected to the top edges of the two side walls, two insertion holes are symmetrically arranged on the bottom sides of the two side walls, and a hanging plate is formed on each of the opposite sides of the top wall.

[0011] The lower connecting base has a lower base body and two insertion plates which are integrally formed on the opposite sides of the lower base body, and the two insertion plates can be respectively and tightly inserted into the two insertion holes;

[0012] The upper connecting base has an upper base body which is arranged on the outer surface of the top wall, and two hanging ears which are integrally formed on the opposite sides of the upper base body, each of the two hanging ears is provided with a hanging hole, and the two hanging holes can be respectively hung on the two hanging plates.

[0013] As a further improvement of the present application, a lower armature and an upper armature are further provided, the lower armature is covered on the outside of the active contact, the upper armature is arranged on the inner surface of the top wall of the middle connecting piece, and the upper armature is also located above the lower armature; when the active contact is attracted and communicated with the main static contact, a magnetic circuit can be formed between the lower armature and the upper armature, so as to realize the electromagnetic attraction force of the active contact in the upward direction.

[0014] As a further improvement of the present application, the active contact is a long strip plate structure; the lower armature is a long strip U-shaped groove structure which extends along the length direction of the active contact and has a U-shaped vertical cross section, and the lower armature is covered on the middle part of the active contact by interference tight fitting; the upper armature is a block which is riveted on the inner surface of the top wall of the middle connecting piece.

[0015] As a further improvement of the present application, a hole groove is formed on the upper side of the lower connecting seat to accommodate the lower end of the contact spring, and a recess is concavely arranged on the outer side of the bottom wall of the lower armature to accommodate the upper end of the contact spring.

[0016] As a further improvement of the present application, the relay has a ceramic shell; the main static contact and the auxiliary static contact are both two, the two main static contacts are fixedly inserted side by side on the top wall of the ceramic shell, and the two auxiliary static contacts are also fixedly inserted side by side on the top wall of the ceramic shell; the main movable contact, the contact spring and the auxiliary movable contact are all built-in in the ceramic shell.

[0017] As a further improvement of the present application, a PCB board and a lead-out assembly are further provided, the PCB board is arranged on the outer surface of the top wall of the ceramic shell, and the PCB board is further electrically connected with the two auxiliary static contacts; the lead-out assembly has a skeleton and a lead-out sheet embedded in the skeleton, the skeleton is positioned and connected on the outer surface of the ceramic shell, and the lead-out sheet is electrically connected with the PCB board.

[0018] The beneficial effects of the present application are: ① Compared with the prior art, the auxiliary contact assembly (including auxiliary static contact and auxiliary movable contact) of the present application can move synchronously with the main contact assembly (including main static contact and main movable contact), so that the actual working state of the main contact assembly can be well reflected, and the accuracy of the feedback signal of the auxiliary contact assembly is very high. ② Unlike the lead-out form of the existing auxiliary contact, the present application adopts a lead-out sheet form, that is, the auxiliary static contact is welded with the PCB board, and then the lead-out sheet is welded with the PCB board, and finally the lead-out sheet is led out to the outside of the product; and particularly, the lead-out sheet is injection-molded and embedded in the skeleton, that is, the lead-out assembly can be made into a plane and laser-welded with an external copper bar, which can effectively ensure the reliability of the connection without the risk of poor contact caused by wire crimping, and also reduce the resistance at the connection, and on the other hand, automation production can be realized, and assembly efficiency is improved. ③ The present application further provides a lower armature wrapped around the main movable contact and an upper armature located above the lower armature, when the main movable contact and the main static contact are attracted and communicated, a magnetic circuit can be formed between the lower armature and the upper armature to generate an electromagnetic attraction force in the direction of the force of the main movable contact, by virtue of the electromagnetic attraction force, the attraction force between the main movable contact and the main static contact can be increased, thereby resisting the electrodynamic repulsion force generated between the main movable contact and the main static contact, which can effectively limit the action of the main movable contact separating from the main static contact, and can effectively suppress the generation of arc, thereby greatly improving the short-circuit resistance and safety during the operation of the relay. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1Fig. 1 is a perspective view of the relay according to the present application;

[0020] Figure 2 Fig. 2 is a perspective view of a partial structure of the relay according to the present application (with the skeleton removed);

[0021] Figure 3 Fig. 3 is a perspective view of a contact structure of the relay according to the present application;

[0022] Figure 4 Fig. 4 is a perspective view of a partial structure of the contact structure of the relay according to the present application (with the main static contact removed);

[0023] Figure 5 Fig. 5 is a partial sectional view of the relay according to the present application in a first perspective;

[0024] Figure 6 Fig. 6 is a partial sectional view of the relay according to the present application in a second perspective;

[0025] Figure 7 Fig. 7 is a first sectional view of the base according to the present application;

[0026] Figure 8 Fig. 8 is a second sectional view of the base according to the present application.

[0027] The present application will be described in greater detail by reference to the drawings as follows:

[0028] 10 - main static contact; 11 - main dynamic contact; 12 - contact spring; 13 - auxiliary static contact; 14 - auxiliary dynamic contact; 140 - base; 141 - contact point; 142 - hollow hole; 150 - lower connecting seat; 1500 - lower seat body; 1501 - insertion plate; 151 - middle connecting piece; 1510 - side vertical wall; 1511 - top wall; 1512 - insertion hole; 1513 - hanging plate; 152 - upper connecting seat; 1520 - upper seat body; 1521 - hanging ear; 1522 - hanging hole; 16 - lower armature; 17 - upper armature; 18 - PCB board; 190 - skeleton; 191 - lead-out piece; 2 - push rod; 3 - ceramic shell. DETAILED DESCRIPTION

[0029] The above description is only used to explain the present application and should not be used to limit the scope of the present application. Those skilled in the art can easily understand other advantages and effects of the present application from the above description.

[0030] It is to be understood that the structures, proportions, sizes, etc. shown in the drawings accompanying the present specification are to be taken as illustrative only and are not to be construed as limiting the scope of the present application, which is defined by the appended claims. As such, any modification of structure, proportion, size, etc. that does not depart from the spirit of the present application is intended to be within the scope of the present application.

[0031] Embodiment:

[0032] Please refer to the accompanying drawings Figure 1 to the accompanying drawings Figure 8 shown. The relay contact structure described in the present application comprises a main static contact 10, a main active contact 11, and a contact spring 12, the main static contact 10 and the main active contact 11 are arranged vertically opposite to each other, the contact spring 12 is installed on the upper side of the push rod 2 and can provide an upward elastic support force to the main active contact 11, and the main active contact 11 can be attracted and communicated with the main static contact 10 or disconnected under the joint driving of the push rod 2 and the contact spring 12; In particular, it also comprises an auxiliary static contact 13 and an auxiliary active contact 14, the auxiliary static contact 13 is positioned beside the main static contact 10, the auxiliary active contact 14 is connected to the upper side of the push rod 2 and is located below the auxiliary static contact 13 at the same time, and the auxiliary active contact 14 can be attracted and communicated with the auxiliary static contact 13 or disconnected under the driving of the push rod 2. The auxiliary contact assembly (including auxiliary static contact and auxiliary active contact) described in the present application can move synchronously with the main contact assembly (including main static contact and main active contact), so as to well reflect the actual working state of the main contact assembly, and then realize the high accuracy of the feedback signal of the auxiliary contact assembly.

[0033] In the present embodiment, preferably, the auxiliary static contact 13 is two, both of the auxiliary static contact 13 are vertically placed cylindrical structures and are also arranged in parallel and spaced apart;

[0034] The auxiliary active contact 14 has a curved long strip-shaped base body 140 and two contact points 141 integrally formed on both ends of the length direction of the base body 140, respectively, the base body 140 is connected to the upper side of the push rod 2, and the two contact points 141 are located below the two auxiliary static contacts 13, respectively, and can be attracted and communicated with the two auxiliary static contacts 13 or disconnected, respectively. By designing the base body to be curved, as shown in the accompanying drawings Figure 7 and 8 , the elasticity of the auxiliary active contact as a whole can be effectively increased, and the stress of the auxiliary active contact on the upper connecting seat can be well released.

[0035] In addition, the embodiment is to realize the specific structure of "the base 140 is connected to the upper side of the push rod 2", that is, as shown in the accompanying drawings Figure 3 and 4 The connecting assembly is provided, which has a lower connecting seat 150, a middle connecting piece 151 and an upper connecting seat 152. The lower connecting seat 150 is made of plastic material and is positioned and sleeved on the upper side of the push rod 2. The middle connecting piece 151 is a reverse U-shaped structure made of metal material, which is covered on the middle part of the active contact 11 and is positioned and connected with the lower connecting seat 150. The upper connecting seat 152 is made of plastic material and is positioned and arranged on the outer surface of the top wall of the middle connecting piece 151. The middle part of the base 140 is embedded in the upper connecting seat 152.

[0036] Further preferably, the part of the base 140 exposed outside the upper connecting seat 152 is formed with a hollow hole 142, so as to reduce the overall weight of the auxiliary movable contact and improve the overall elasticity. The bottom side of the middle connecting piece 151 is detachably positioned and connected with the lower connecting seat 150. The upper connecting seat 152 is placed on the outer surface of the top wall of the middle connecting piece 151, and at the same time, the upper connecting seat 152 is also detachably positioned and connected with the top wall of the middle connecting piece 151.

[0037] More preferably, as shown in the accompanying drawings Figure 4 The middle connecting piece 151 has two side walls 1510 and a top wall 1511 which is fixedly connected to the top edges of the two side walls 1510. Two insertion holes 1512 are symmetrically arranged on the bottom sides of the two side walls 1510. Two hanging plates 1513 are respectively formed on the opposite sides of the top wall 1511.

[0038] The lower connecting seat 150 has a lower seat body 1500 and two insertion plates 1501 which are respectively integrally formed on the opposite sides of the lower seat body 1500. The two insertion plates 1501 can be respectively and correspondingly tightly fitted and inserted into the two insertion holes 1512. It is to be noted that although it is "tightly fitted and inserted", the insertion hole and the insertion plate can be separated under the force of the operator.

[0039] The upper connecting seat 152 has an upper seat body 1520 which is placed on the outer surface of the top wall 1511, and two hanging ears 1521 which are respectively integrally formed on the opposite sides of the upper seat body 1520. Two hanging holes 1522 are respectively arranged on the two hanging ears 1521, and the two hanging holes 1522 can be respectively hung on the two hanging plates 1513.

[0040] In the embodiment, preferably, as shown in the accompanying drawings Figure 5 and 6As shown, a lower armature 16 is sleeved outside the main movable contact 11, and an upper armature 17 is positioned on the inner surface of the top wall of the middle connecting piece 151, and the upper armature 17 is located above the lower armature 16. When the main movable contact 11 is attracted to the main static contact 10 to be in communication, a magnetic circuit can be formed between the lower armature 16 and the upper armature 17 to generate an electromagnetic attractive force in the upward direction on the main movable contact 11. With the electromagnetic attractive force, the attraction between the main movable contact and the main static contact can be increased, thereby resisting the electrodynamic repulsive force generated between the main movable contact and the main static contact, effectively limiting the action of the main movable contact separating from the main static contact, and effectively suppressing the generation of arc, thereby greatly improving the short-circuit resistance and safety during the operation of the relay.

[0041] Further preferably, the main movable contact 11 is in a long strip plate structure; the lower armature 16 is in a long strip U-shaped groove structure extending along the length direction of the main movable contact 11 and having a U-shaped vertical cross section, and the lower armature 16 is sleeved on the middle part of the main movable contact 11 by interference fit; the upper armature 17 is in a block shape and is riveted on the inner surface of the top wall of the middle connecting piece 151, or the upper armature 17 is in two, both of which are arched blocks and are riveted on the inner surface of the top wall of the middle connecting piece 151 along the length direction of the main movable contact 11.

[0042] Further preferably, a hole is formed on the upper side of the lower connecting seat 150 to accommodate the lower end of the contact spring 12, and a groove is recessed on the outer side of the bottom wall of the lower armature 16 to accommodate the upper end of the contact spring 12.

[0043] In the embodiment, preferably, as shown in the accompanying drawings, Figure 1 and 2 As shown, the relay has a ceramic housing 3; the main static contact 10 and the auxiliary static contact 13 are both two, the two main static contacts 10 are fixed and inserted side by side on the top wall of the ceramic housing 3, the two auxiliary static contacts 13 are also fixed and inserted side by side on the top wall of the ceramic housing 3, and the side-by-side arrangement direction of the two main static contacts 10 is perpendicular to the side-by-side arrangement direction of the two auxiliary static contacts 13; the main movable contact 11, the contact spring 12, and the auxiliary movable contact 14 are all built-in in the ceramic housing 3. In addition, the connecting assembly, the lower armature 16, and the upper armature 17 are also all built-in in the ceramic housing 3.

[0044] In the embodiment, preferably, as shown in the accompanying drawings, Figure 1 and 2As shown, the PCB 18 is arranged on the outer surface of the top wall of the ceramic shell 3, and the PCB 18 is also electrically connected with the two auxiliary static contacts 13. The lead-out assembly has a skeleton 190 and a lead-out sheet 191 embedded in the skeleton 190. The skeleton 190 is positioned and connected on the outer surface of the ceramic shell 3, and the lead-out sheet 191 is electrically connected with the PCB 18. The existing auxiliary contact lead-out form is basically wire lead-out, which needs manual welding and is not conducive to automatic production. Unlike the prior art, the present application adopts a lead-out sheet lead-out form, that is, the auxiliary static contact is welded with the PCB, then the lead-out sheet is welded with the PCB, and finally the lead-out sheet is led out to the outside of the product. Moreover, the lead-out sheet is injection-molded and embedded in the skeleton, that is, the lead-out assembly can be made into a plane and laser welded with an external copper bar. On the one hand, this can effectively ensure the reliability of the connection, without the risk of poor contact caused by wire crimping, and also reduce the resistance at the connection. On the other hand, it can realize automatic production and improve assembly efficiency.

[0045] In summary, by improving the structure of the relay contact, the auxiliary contact assembly can well reflect the actual working state of the main contact assembly, with very high feedback signal accuracy. On the other hand, the lead-out form of the auxiliary contact assembly is reliable in connection and high in assembly efficiency.

[0046] The above description is only the preferred embodiment of the present application, but is not used to limit the present application. It should be pointed out that for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, and these improvements and modifications should be considered within the protection scope of the present application.

Claims

1. A relay contact structure comprising a main static contact (10), a main dynamic contact (11) and a contact spring (12), the main static contact (10) and the main dynamic contact (11) being arranged vertically opposite to each other, the contact spring (12) being installed on the upper side of a push rod (2) and capable of providing an upward elastic supporting force to the main dynamic contact (11), and the main dynamic contact (11) being capable of being attracted to communicate with or disconnected from the main static contact (10) under the joint driving of the push rod (2) and the contact spring (12); characterized in that: The relay has a ceramic shell (3); the main static contact (10) and the auxiliary static contact (13) are both two, two main static contacts (10) are fixed and inserted side by side on the top wall of the ceramic shell (3), and two auxiliary static contacts (13) are also fixed and inserted side by side on the top wall of the ceramic shell (3); the main moving contact (11), the contact spring (12) and the auxiliary moving contact (14) are all built-in in the ceramic shell (3), and a PCB board (18) and a lead-out assembly are further arranged, the PCB board (18) is arranged on the outer surface of the top wall of the ceramic shell (3), and the PCB board (18) is further electrically connected with the two auxiliary static contacts (13); the lead-out assembly has a skeleton (190) and a lead-out sheet (191) embedded in the skeleton (190), the skeleton (190) is connected on the outer surface of the ceramic shell (3), and the lead-out sheet (191) is electrically connected with the PCB board (18) through a welding process, and the lead-out assembly is a planar structure and is laser welded with an external copper bar.

2. The relay contact structure of claim 1, wherein: The auxiliary static contact (13) is two, and the two auxiliary static contacts (13) are both vertically placed cylindrical structures and are also arranged in parallel at intervals; The auxiliary moving contact (14) has a curved long strip-shaped base body (140) and two contacts (141) integrally formed on both ends of the base body (140) in the length direction, the base body (140) is connected on the upper side of the push rod (2), and the two contacts (141) are respectively located below the two auxiliary static contacts (13) and can be respectively attracted and communicated or disconnected with the two auxiliary static contacts (13).

3. The relay contact structure of claim 2, wherein: A connecting assembly is further arranged, the connecting assembly has a lower connecting seat (150), a middle connecting piece (151) and an upper connecting seat (152), the lower connecting seat (150) is positioned and sleeved on the upper side of the push rod (2), the middle connecting piece (151) is a reverse U-shaped structure, the reverse U-shaped structure is arranged on the middle part of the main moving contact (11) and is connected with the lower connecting seat (150), the upper connecting seat (152) is arranged on the outer surface of the top wall of the middle connecting piece (151), and the middle part of the base body (140) is embedded in the upper connecting seat (152).

4. The relay contact structure of claim 3, wherein: The bottom side of the middle connecting piece (151) is detachably positioned and connected with the lower connecting base (150); the upper connecting base (152) is placed on the outer surface of the top wall of the middle connecting piece (151), and meanwhile the upper connecting base (152) is also detachably positioned and connected with the top wall of the middle connecting piece (151).

5. The relay contact structure of claim 4, wherein: The middle connecting piece (151) has two side standing walls (1510) and a top wall (1511) which is transversely arranged and fixedly connected on the top edges of the two side standing walls (1510), and two insertion holes (1512) are symmetrically arranged on the bottom sides of the two side standing walls (1510); a hanging plate (1513) is formed on each of the opposite sides of the top wall (1511); The lower connecting base (150) has a lower base body (1500) and two insertion plates (1501) which are integrally formed on the opposite sides of the lower base body (1500), and the two insertion plates (1501) can be respectively and correspondingly tightly fitted and inserted into the two insertion holes (1512); The upper connecting base (152) has an upper base body (1520) which is placed on the outer surface of the top wall (1511), and two hanging ears (1521) which are integrally formed on the opposite sides of the upper base body (1520), and a hanging hole (1522) is arranged on each of the two hanging ears (1521), and the two hanging holes (1522) can be respectively hung on the two hanging plates (1513).

6. The relay contact structure of claim 3, wherein: A lower armature (16) and an upper armature (17) are further arranged, the lower armature (16) is arranged outside the active contact (11), the upper armature (17) is positioned and arranged on the inner surface of the top wall of the middle connecting piece (151), and meanwhile the upper armature (17) is also located above the lower armature (16); when the active contact (11) is attracted and communicated with the main static contact (10), a magnetic circuit can be formed between the lower armature (16) and the upper armature (17) to realize an electromagnetic attraction force of the active contact (11) in the direction of force upward.

7. The relay contact structure of claim 6, wherein: The active contact (11) is in a long strip plate structure; The lower armature (16) is in a long strip U-shaped groove structure which extends along the length direction of the active contact (11) and has a U-shaped vertical section, and the lower armature (16) is tightly fitted and arranged outside the middle part of the active contact (11); The upper armature (17) is in a block structure which is riveted on the inner surface of the top wall of the middle connecting piece (151).

8. The relay contact structure of claim 6, wherein: A hole groove is formed on the upper side of the lower connecting base (150) to accommodate the lower end of the contact spring (12), and a recess is concavely arranged on the outer side of the bottom wall of the lower armature (16) to accommodate the upper end of the contact spring (12).

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