Relay static contact structure

Abstract

The utility model discloses a relay static contact structure, which comprises a contact rod and a lock accessory made of a conductive metal material with yield strength higher than that of the contact rod, one end of the contact rod is provided with an assembly hole, the lock accessory is fixedly inserted in the assembly hole, and the top of the lock accessory is provided with a threaded hole. The relay static contact structure is formed by combining the contact rod and the lock accessory which are made of two different materials, and the threaded hole arranged on the lock accessory is used for being connected with an external fastener, so that an external electric connecting piece is locked and attached to the lock accessory, and the contact rod is connected into a load loop through the lock accessory. Due to the fact that the lock accessory has high yield strength, the lock accessory can bear higher installation torsion, the installation strength of the direct-current relay is improved, the thread strength of the threaded hole in the lock accessory is high, and the phenomena of back twisting and thread loosening are not prone to occurring.

Description

Technical Field

[0001] The utility model relates to the technical field of relays, and particularly relates to a static contact structure of a relay. Background Art

[0002] With the rapid development of new energy vehicles such as electric vehicles, the application of in-vehicle high-voltage DC systems is becoming more and more extensive. As a key component in the in-vehicle high-voltage DC system, the high-voltage DC relay undertakes the important responsibility of controlling the on-off of the circuit. In the in-vehicle environment, special requirements are imposed on the static contacts of the high-voltage DC relay. Since the vehicle will face various complex road conditions and vibrations during driving, the static contacts are required to have good mechanical stability and anti-vibration performance to ensure reliable operation under harsh conditions.

[0003] In the attached drawings of the specification Figure 1 The shown is a cross-sectional view of the static contact 100 of a traditional relay, which is usually fixedly connected and sealed with the ceramic cover of the DC relay by means of a brazing process. Since the static contact 100 is made of oxygen-free copper throughout, the thread strength of the internal thread of the static contact is low, which easily leads to problems such as untwisting and slipping of the thread. Therefore, it is necessary to improve the existing technology to overcome the defects in the existing technology. Summary of the Utility Model

[0004] The problem to be solved by the utility model is to provide a static contact structure of a relay to overcome the defects of low installation torque, easy untwisting and slipping of the existing static contacts.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a static contact structure of a relay, comprising: a contact rod and a locking accessory made of a conductive metal material with a yield strength higher than that of the contact rod. One end of the contact rod is provided with an assembly hole, the locking accessory is fixedly inserted into the assembly hole, and a threaded hole is provided at the top of the locking accessory.

[0006] As a further improvement of the utility model, the locking accessory is provided with a screw sleeve portion and a support portion horizontally extending outward along the outer periphery of the top of the screw sleeve portion. The threaded hole is located in the screw sleeve portion, and the support portion is located outside the contact rod.

[0007] As a further improvement of the utility model, the support portion vertically extends downward along the outer periphery of its bottom to form a lower edge portion.

[0008] As a further improvement of the utility model, the diameter of the support portion is larger than the diameter of the contact rod.

[0009] As a further improvement of the utility model, the inner diameter of the upper part of the assembly hole is enlarged to form a stepped groove on its inner wall for accommodating a solder ring.

[0010] As a further improvement of the present utility model, the contact rod and the lock attachment are fixed by welding.

[0011] As a further improvement of the present utility model, the contact rod is made of oxygen-free copper, and the lock attachment is made of stainless steel, low-carbon steel, dispersion copper or zirconium copper.

[0012] The beneficial effects of the present utility model are as follows: The present utility model provides a static contact structure of a relay, which is composed of a contact rod and a lock attachment made of two different materials. The threaded hole provided in the lock attachment is used to connect with an external fastener, so as to lock an external electrical connector on the lock attachment, enabling the contact rod to access the load circuit through the lock attachment. Since the lock attachment has a high yield strength, it can withstand a higher installation torque, improving the installation strength of the DC relay. The thread strength of the threaded hole in the lock attachment is high, and the phenomena of torque back-off and thread slipping are not likely to occur. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a perspective view of the static contact of the prior art;

[0014] Figure 2 is a perspective view of the static contact structure of the relay of the present utility model;

[0015] Figure 3 is a sectional view of the static contact structure of the relay of the present utility model;

[0016] Figure 4 is an exploded view of the static contact structure of the relay of the present utility model;

[0017] Figure 5 is a sectional view of the assembly of the static contact structure of the relay of the present utility model and the ceramic cover.

[0018] The following descriptions are made in conjunction with the accompanying drawings:

[0019] 1. Contact rod; 101. Assembly hole; 102. Step groove; 2. Lock attachment; 201. Threaded hole; 202. Sleeve part; 203. Support part; 204. Lower edge part; 3. Solder ring; 4. Ceramic cover; 100. Static contact. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following describes in detail the preferred embodiments of the present utility model in conjunction with the accompanying drawings.

[0021] Refer to Figures 2 to 5The utility model provides a relay static contact structure, including: a contact rod 1 and a locking accessory 2. The contact rod 1 can be, but is not limited to, cylindrical, and its material can be oxygen-free copper, or other special copper alloys that can meet the electrical performance requirements. The upper end of the contact rod 1 is provided with an assembly hole 101 along the central axis, and the assembly hole 101 is a blind hole. The locking accessory 2 is fixedly inserted into the assembly hole 101, and the top of the locking accessory 2 is provided with a threaded hole 201 vertically downward along the central axis. The threaded hole 201 is used to connect with an external fastener such as a screw to lock an external electrical connector such as a copper busbar or an aluminum busbar to the locking accessory 2, so that the contact rod 1 is connected to the load circuit through the locking accessory 2.

[0022] It is worth mentioning that the lock accessory 2 in the present invention is made of a conductive metal material having a higher yield strength than the contact rod 1, such as stainless steel, low carbon steel, dispersed copper or zirconium copper.

[0023] At present, in DC relays, in order to reduce arc length and discharge energy, improve the electrical performance and service life of the relay, and increase the reliability of the relay, the moving contact and the static contact of the DC relay are usually separated and combined in a sealed environment filled with protective gas. The sealed environment is generally composed of a ceramic cover 4, a magnetic pole piece and other components. The protective gas filled can be nitrogen or hydrogen, etc. At the same time, in order not to affect the stability of the sealed environment, the static contact is generally made of oxygen-free copper or special copper, etc., which has a low oxygen content and will not release too much oxygen into the sealed environment. However, due to the low yield strength of oxygen-free copper, which is roughly 70MPa to 120MPa, it will significantly limit the installation torque of the static contact.

[0024] The utility model fixes a locking accessory 2 on the contact rod 1, and the locking accessory 2 is made of a conductive metal material with a yield strength higher than that of the contact rod 1. In this way, the contact rod 1 extending into the ceramic cover 4 is still made of oxygen-free copper or its substitute material, ensuring that the sealing environment will not be affected. At the same time, the oxygen-free copper has high weldability, which ensures the reliability of the welding seal with the ceramic cover 4, reduces the risk of air leakage, and ensures the service life of the DC relay. The locking accessory 2 is outside the sealed environment. Due to its high yield strength, when it is locked and fixed with an external electrical connector, it can withstand a higher installation torque, thereby improving the installation strength of the DC relay. The thread strength of the threaded hole 201 in the locking accessory 2 is high, and back-twisting and slipping are not prone to occur.

[0025] See also Figure 3 and Figure 4, the lock attachment 2 is provided with a screw sleeve portion 202 and a support portion 203. The screw sleeve portion 202 is a cylindrical shape with an open top and a bottom or without a bottom. The threaded hole 201 is formed inside the screw sleeve portion 202. The outer peripheral surface of the screw sleeve portion 202 is smooth and is used for direct insertion and fit with the assembly hole 101. The support portion 203 extends horizontally and radially outward along the outer periphery from the top of the screw sleeve portion 202. The support portion 203 can be, but is not limited to, an annular shape, and the support portion 203 is located above the contact rod 1. On the one hand, the support portion 203 can support on the top of the ceramic cover 4 when the static contact and the ceramic cover 4 are assembled, playing a role of support and limit. On the other hand, it can be used as an installation surface for locking and attaching to external electrical connectors such as copper bars and aluminum bars to make them fit tightly with each other.

[0026] It is worth mentioning that the diameter of the support portion 203 is larger than the diameter of the contact rod 1. In this way, the upper surface area of the support portion 203 can be increased, that is, the contact area between the support portion 203 and the external electrical connector is increased, thereby reducing the contact resistance and increasing the locking force-bearing area.

[0027] Refer to Figure 5 , the lower edge portion 204 is formed by vertically extending downward along the outer periphery of the bottom of the support portion 203 and is used for supporting on the top of the ceramic cover 4, playing a role of support and limit.

[0028] In the present utility model, the contact rod 1 and the lock attachment 2 can be fixed by a welding method. The welding methods include, but are not limited to, brazing, resistance welding, etc. In this embodiment, brazing is preferably used.

[0029] Among them, the inner diameter of the upper half of the assembly hole 101 is enlarged to form a stepped groove 102 on its inner wall for accommodating the solder ring 3. During assembly, the annular solder ring 3 can be first sleeved on the screw sleeve portion 202, and then the screw sleeve portion 202 is inserted into the assembly hole 101. The solder ring 3 reaches the bottom along the stepped groove 102. During brazing, the molten solder accumulates in the stepped groove 102, which can also improve the welding strength.

[0030] Figure 5 This is a schematic diagram of the static contact of the present utility model assembled on the ceramic cover 4. The ceramic cover 4 is generally a rectangular cover body structure with a top and no bottom, Figure 5 only the top of the ceramic cover 4 is shown in the figure. The top of the ceramic cover 4 is provided with a through hole. The contact rod 1 is inserted into the through hole. The lower edge portion 204 of the lock attachment 2 supports and limits on the top surface of the ceramic cover 4. The outer peripheral surface of the contact rod 1 is welded and fixed to the lower edge of the through hole through another solder ring 3 to achieve sealing. Among them, the assembly hole 101 of the contact rod 1 is designed as a blind hole, which will not affect the sealing performance inside the ceramic cover 4.

[0031] The static contact structure of the relay of the utility model is composed of a contact rod 1 and a locking accessory 2 made of two different materials. The threaded hole 201 provided in the locking accessory 2 is used to connect with an external fastener to lock the external electrical connector on the locking accessory 2, so that the contact rod 1 is connected to the load circuit through the locking accessory 2. Since the locking accessory 2 has a higher yield strength, it can withstand a higher installation torque, thereby improving the installation strength of the DC relay. The thread strength of the threaded hole 201 in the locking accessory 2 is high, and back-twisting and slipping are not easy to occur.

[0032] In the above description, many specific details are described to facilitate a full understanding of 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 by the specific implementation disclosed above. At the same time, any person familiar with the technical field 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 of equivalent changes. Any simple modification, equivalent change and modification 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 falls within the scope of protection of the technical solution of the present invention.

Claims

1. A relay static contact structure, characterized in that: include: A contact rod (1) and a locking accessory (2) made of a conductive metal material having a yield strength higher than that of the contact rod (1); one end of the contact rod (1) is provided with an assembly hole (101); the locking accessory (2) is fixedly inserted into the assembly hole (101); and a threaded hole (201) is provided at the top of the locking accessory (2).

2. The relay static contact structure according to claim 1, characterized in that: The locking accessory (2) is provided with a screw sleeve portion (202) and a support portion (203) extending horizontally outward along the top periphery of the screw sleeve portion (202), the threaded hole (201) is located in the screw sleeve portion (202), and the support portion (203) is located outside the contact rod (1).

3. The relay static contact structure according to claim 2, characterized in that: The support portion (203) extends vertically downward along the outer periphery of the bottom thereof to form a lower edge portion (204).

4. The relay static contact structure according to claim 2, characterized in that: The diameter of the support portion (203) is greater than the diameter of the contact rod (1).

5. The relay static contact structure according to claim 1, characterized in that: The inner diameter of the upper portion of the assembly hole (101) is enlarged to form a stepped groove (102) on the inner wall thereof for accommodating the solder ring (3).

6. The relay static contact structure according to claim 1, characterized in that: The contact rod (1) and the locking accessory (2) are fixed by welding.

7. The relay static contact structure according to claim 1, characterized in that: The material used for the contact rod (1) is oxygen-free copper, and the material used for the lock accessory (2) is stainless steel, low-carbon steel, dispersed copper or zirconium copper.

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