A high voltage DC relay
By introducing the connection between auxiliary contacts and auxiliary needles in the high-voltage DC relay, the contact clamp and positioning plate design is solved, and the series movement problem caused by the deflection of the push rod during the suction and engagement of the moving contact is solved, which improves the reliability and service life of the product.
Patent Information
- Application Number
- CN202421544657.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-02
- Publication Date
- 2025-04-11
- Estimated Expiration
- 2034-07-02
AI Technical Summary
During the draw-in process of existing high-voltage DC relays, due to the deflection of the push rod component, the moving contacts move in series along the width direction of the moving contacts, resulting in a reduced reliability.
By introducing the connection between the auxiliary contact and the auxiliary needle in the high-voltage DC relay, the operating state of the main contact is monitored, and the sway of the moving contact is restricted through the contact clamp and the contact positioning plate to avoid the disadvantages caused by friction.
It improves the reliability of high-voltage DC relays, prevents the series of moving contacts caused by friction, and extends the service life of the product.
Smart Images
Figure CN222749410U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of relays, in particular to a high-voltage direct current relay. Background Art
[0002] A relay is an electrical control device. When the change in input quantity reaches the specified requirement, the controlled quantity in the electrical output circuit will undergo a predetermined step change. Therefore, it plays the role of automatic adjustment, safety protection, and circuit conversion in the circuit. Among them, a high-voltage relay is an electrical device that causes a predetermined step change in the controlled quantity in the electrical output circuit when the change in the input quantity of the high-voltage circuit reaches the specified requirement. It has a control system and a controlled system, and is usually used in automatic control circuits. High-voltage DC relays have been used in the new energy market for many years.
[0003] Most of the existing high-voltage DC relays currently use a moving contact direct-acting structure. The contact part of the DC relay includes two static contacts and a dynamic component. The dynamic component includes a moving contact and a push rod component. The moving contact is usually a straight piece. When the coil is energized, the moving iron core moves, and the moving contact located in an insulating cover is driven to move through the push rod component, so that the two ends of the moving contact are respectively in contact with the two static contacts penetrated through the top of the insulating cover to connect the load circuit. However, during the product's attraction process, the push rod component will deflect around its axis due to the action of the reaction spring, which can easily cause the push rod component and the moving contact thereon to move in series along the width direction of the moving contact. Utility Model Content
[0004] In view of the deficiencies of the prior art, the utility model provides a high-voltage DC relay, which overcomes the deficiencies of the prior art, and realizes monitoring of the action state of the main contact by connecting the auxiliary contact with two auxiliary pins, thereby greatly improving the reliability of the high-voltage DC relay. And through the effects of the contact clamp and the contact positioning sheet, the swing of the moving contact along the width direction of the moving contact is effectively restricted, avoiding the disadvantages caused by the friction of the moving contact.
[0005] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:
[0006] A high-voltage DC relay comprises a housing base and an upper housing, wherein a coil assembly is installed in the housing base, a moving iron core is movably installed in the middle of the coil assembly, a driving shaft is fixedly installed in the middle of the moving iron core, and a coil end cover is installed above the housing base;
[0007] The upper shell is fixedly installed above the shell base, and a contact cavity cover is arranged inside the upper shell, and the contact cavity cover is installed above the coil end cover, and a contact clamping seat is arranged inside the contact cavity cover, and the upper end of the drive shaft passes through the coil end cover and is connected to the contact clamping seat; a moving contact is installed in the contact clamping seat, and an auxiliary positioning contact seat is fixedly installed above the contact clamping seat, and a spring is installed on the auxiliary positioning contact seat, and auxiliary contacts are respectively installed at both ends of the upper surface of the spring, and an auxiliary needle is fixedly installed on the upper surface of the contact cavity cover, and the lower end of the auxiliary needle passes through the contact cavity cover and corresponds to the auxiliary contact; a static contact is installed on the upper shell, and the lower end of the static contact passes through the contact cavity cover and corresponds to the moving contact up and down.
[0008] Preferably, the contact clamp seat includes an insulating base, which is connected to the driving shaft, and a contact clamp is fixedly installed on the top of the insulating base. The cross-section of the contact clamp is an n-shaped structure, and a contact positioning piece is provided in the inner cavity of the contact clamp. A spring is installed between the lower surface of the contact positioning piece and the upper surface of the insulating base, and the moving contact is installed in the contact positioning piece. An armature block is fixedly installed on the upper wall of the inner cavity of the contact clamp, and the upper surface of the contact positioning piece is in contact with the lower surface of the armature block.
[0009] Preferably, the contact clamp comprises an n-type upper clamp and two arc portions bent outward, the two arc portions are respectively located at two ends of the n-type upper clamp, the lower ends of the arc portions are fixedly connected to the insulating base through the connecting portion, and the n-type upper clamp, the arc portion and the connecting portion are arranged as an integrated structure;
[0010] Positioning protrusions are provided at both left and right ends of the front and rear side surfaces of the contact positioning piece, and the positioning protrusions are respectively located on the front and rear sides of the n-type upper clamp, the farthest distance between the two positioning protrusions located on the front side surface is smaller than the shortest distance between the two arc portions, and the farthest distance between the two positioning protrusions located on the front side surface is greater than the distance between the left and right side surfaces of the n-type upper clamp.
[0011] Preferably, a square hole is provided in the middle of the arc portion.
[0012] Preferably, both left and right side surfaces of the inner wall of the contact cavity cover are provided with positioning ribs, and the positioning ribs are in contact with the outer surface of the arc portion.
[0013] Preferably, the inner cavity of the upper shell is further provided with two magnet positioning plates, and the inner side surfaces of the magnet positioning plates are both installed with magnetic steels, and the two magnetic steels respectively correspond to the contact positions of the moving contact and the static contact.
[0014] The utility model provides a high-voltage DC relay. It has the following beneficial effects: the moving contact and the auxiliary positioning contact seat are driven to move upward together through the contact clamping seat, so that the moving contact is in contact with the two static contacts, so that the two static contacts are in a connected state. At the same time, the auxiliary contact is also connected to the two auxiliary needles to realize the monitoring of the action state of the main contact, thereby greatly improving the reliability of the high-voltage DC relay. And through the action of the contact clamp and the contact positioning sheet, the swing of the moving contact along the width direction of the moving contact is effectively restricted, so that the friction between the moving contact and the contact cavity cover is transformed into the friction between the contact clamp and the contact cavity cover, avoiding the disadvantages caused by the friction of the moving contact. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings required for describing the prior art are briefly introduced below.
[0016] Figure 1 A schematic diagram of the structure of the utility model;
[0017] Figure 2 The cross-sectional structure of the utility model is shown in FIG. Figure 1 ;
[0018] Figure 3 The cross-sectional structure of the utility model is shown in FIG. Figure 2 ;
[0019] Figure 4 A schematic diagram of the structure of the contact cavity cover and the magnetic steel in the utility model;
[0020] Figure 5 A schematic diagram of the structure of the contact clamping seat in the utility model;
[0021] Figure 6 A schematic diagram of the structure of the contact clamp in the utility model;
[0022] Figure 7 A schematic diagram of the structure of the contact positioning piece in the utility model;
[0023] Description of the numbers in the figure:
[0024] 1. Shell base; 2. Upper shell; 3. Coil assembly; 4. Moving iron core; 5. Driving shaft; 6. Coil end cover; 7. Contact cavity cover; 8. Contact clamping seat; 9. Moving contact; 10. Auxiliary positioning contact seat; 11. Spring; 12. Auxiliary contact; 13. Auxiliary needle; 15. Static contact; 16. Magnet positioning piece; 17. Magnetic steel; 18. Positioning rib; 81. Insulating base; 82. Contact clamp; 83. Contact positioning piece; 84. Spring; 85. Armature block; 87. Positioning protrusion; 821. N-type upper clamp; 822. Arc portion; 823. Connecting portion; 824. Square hole. DETAILED DESCRIPTION
[0025] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention.
[0026] Embodiment 1, as Figure 1-7 As shown, a high-voltage DC relay comprises a housing base 1 and an upper housing 2, a coil assembly 3 is installed in the housing base 1, a moving iron core 4 is movably installed in the middle of the coil assembly 3, a driving shaft 5 is fixedly installed in the middle of the moving iron core 4, and a coil end cover 6 is installed above the housing base 1;
[0027] The upper shell 2 is fixedly installed above the shell base 1, and a contact cavity cover 7 is arranged inside the upper shell 2. The contact cavity cover 7 is installed above the coil end cover 6. A contact clamping seat 8 is arranged in the contact cavity cover 7. The upper end of the driving shaft 5 passes through the coil end cover 6 and is connected to the contact clamping seat 8; a moving contact 9 is installed in the contact clamping seat 8, and an auxiliary positioning contact seat 10 is fixedly installed above the contact clamping seat 8. A spring 11 is installed on the auxiliary positioning contact seat 10, and auxiliary contacts 12 are respectively installed on both ends of the upper surface of the spring 11. An auxiliary needle 13 is fixedly installed on the upper surface of the contact cavity cover 7, and the lower end of the auxiliary needle 13 passes through the contact cavity cover 7 and corresponds to the auxiliary contact 12; a static contact 15 is installed on the upper shell 2, and the lower end of the static contact 15 passes through the contact cavity cover 7 and corresponds to the moving contact 9 up and down.
[0028] Working principle:
[0029] When in use, the coil assembly 3 is energized, and the moving iron core 4 moves upward under the magnetic force of the coil assembly 3, and then drives the driving shaft 5 to move upward, and then drives the entire contact clamping seat 8 to move upward, and then drives the moving contact 9 and the auxiliary positioning contact seat 10 to move upward together through the contact clamping seat 8, so that the moving contact 9 abuts against the two static contacts 15, so that the two static contacts 15 are in a connected state. At the same time, it is also connected to the two auxiliary pins 13 through the auxiliary contact 12 to realize the monitoring of the action state of the main contact, thereby greatly improving the reliability of the high-voltage DC relay.
[0030] In addition, in the present embodiment, the contact clamping seat 8 includes an insulating base 81, which is connected to the driving shaft 5. A contact clamp 82 is fixedly installed above the insulating base 81. The cross-section of the contact clamp 82 is an n-shaped structure. A contact positioning piece 83 is provided in the inner cavity of the contact clamp 82. A spring 84 is installed between the lower surface of the contact positioning piece 83 and the upper surface of the insulating base 81. The moving contact 9 is installed in the contact positioning piece 83. An armature block 85 is fixedly installed on the upper wall of the inner cavity of the contact clamp 82. The upper surface of the contact positioning piece 83 is in contact with the lower surface of the armature block 85.
[0031] Therefore, during installation, the spring 84 is first installed at the bottom of the inner cavity of the contact clamp 82, and the contact positioning piece 83 is fixed in the contact clamp 82, and then the moving contact 9 is installed to the upper surface position of the contact positioning piece 83, and the limiting effect of the contact positioning piece 83 is used to achieve the clamping and fixing effect of the moving contact 9, so that the contact clamp 82 and the contact positioning piece 83 can effectively limit the swing of the moving contact 9 along the width direction of the moving contact 9, so that the friction between the moving contact 9 and the contact cavity cover 7 is transformed into the friction between the contact clamp 82 and the contact cavity cover 7, thereby avoiding the disadvantages caused by the friction of the moving contact 9.
[0032] In addition, by installing an insulating contact cavity cover 7 in the upper housing 2, the creepage distance can be effectively increased, which plays a role in insulation and withstand voltage, and prevents the granular splashes generated by the arc melting the moving contact 9 and the static contact 15 from dripping on the coil end cover 6, causing the electrical creepage distance to be reduced, thereby improving the service life of the product.
[0033] Embodiment 2, as a further preferred embodiment of embodiment 1, the contact clamp 82 includes an n-type upper clamp 821 and two arc portions 822 bent outward, the two arc portions 822 are respectively located at both ends of the n-type upper clamp 821, the lower end of the arc portion 822 is fixedly connected to the insulating base 81 through a connecting portion 823, and the n-type upper clamp 821, the arc portion 822 and the connecting portion 823 are an integrated structure.
[0034] Positioning protrusions 87 are provided on the left and right ends of the front and rear side surfaces of the contact positioning piece 83. The positioning protrusions 87 are respectively located on the front and rear sides of the n-type upper clamp 821. The farthest distance between the two positioning protrusions 87 located on the front side surface is smaller than the shortest distance between the two arc portions 822. The farthest distance between the two positioning protrusions 87 located on the front side surface is greater than the distance between the left and right side surfaces of the n-type upper clamp 821.
[0035] First, during assembly, the positioning protrusion 87 of the contact positioning piece 83 can be inserted into the contact clamp 82 from the arc portion 822 of the contact clamp 82, so that the positioning protrusion 87 has a certain movable space in the contact positioning piece 83 through the arc portion 822, so that the positioning protrusion 87 on the front and rear sides of the contact positioning piece 83 can be respectively located on the front and rear sides of the contact clamp 82, and then the spring 84 is installed between the insulating base 81 and the contact positioning piece 83, and then the positioning protrusion 87 is pressed down to separate a certain space between the contact positioning piece 83 and the armature block 85, so that the moving contact 9 can be inserted between the contact positioning piece 83 and the armature block 85 for installation and fixation.
[0036] Secondly, in this embodiment, when the short-circuit current flows through the moving contact 9, the magnetic lines of force around the moving contact 9 gather at the contact positioning piece 83, and the upper surface of the contact positioning piece 83 generates a magnetic field, which generates a suction force on the armature block 85, thereby preventing the moving contact from being bounced. In this embodiment, the contact positioning piece 83 and the armature block 85 can be respectively provided with an upper strip-shaped pole shoe and a lower strip-shaped pole shoe that cooperate with each other, thereby increasing the pole shoe area of the contact positioning piece 83 and the armature block 85, increasing the mutual suction force between the contact positioning piece 83 and the armature block 85, thereby improving the short-circuit resistance and impact resistance.
[0037] Embodiment 3, as a further preferred solution of embodiment 2, a square hole 824 is provided in the middle of the arc portion 822, thereby effectively reducing the material usage and weight of the contact clamp 82.
[0038] Embodiment 4, as a further preferred solution of embodiment 2, positioning ribs 18 are provided on both the left and right sides of the inner wall of the contact cavity cover 7, and the positioning ribs 18 are in contact with the outer surface of the arc portion 822. The arc portion 822 of the contact clamp 82 directly contacts the positioning ribs 18, so as to effectively prevent the contact clamp 82 from being skewed during movement; and the friction between the moving contact 9 and the contact cavity cover 7 is transformed into the friction between the contact clamp 82 and the positioning ribs 18, so as to minimize the friction force and ensure the smooth movement of the product. In addition, since the contact clamp 82 is a stainless steel part, it is not easy to wear.
[0039] Embodiment 5, as a further preferred solution of embodiment 1, the inner cavity of the upper shell 2 is further provided with two magnet positioning pieces 16, and the inner side surfaces of the magnet positioning pieces 16 are both installed with magnetic steels 17, and the two magnetic steels 17 correspond to the contact positions of the moving contact 9 and the static contact 15 respectively. Specifically, the polarities of the surfaces facing each other of the two magnetic steels 17 are opposite. Thus, a magnetic field can be generated between the two magnetic steels 17, so that the arc can be stretched, and then the arc can be extinguished, ensuring that the high-voltage relay can work in a safe environment.
[0040] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A high voltage DC relay, characterized in that: It comprises a housing base (1) and an upper housing (2), wherein a coil assembly (3) is installed in the housing base (1), a moving iron core (4) is movably installed in the middle of the coil assembly (3), a driving shaft (5) is fixedly installed in the middle of the moving iron core (4), and a coil end cover (6) is installed above the housing base (1); The upper shell (2) is fixedly mounted above the housing base (1); a contact cavity cover (7) is arranged inside the upper shell (2); the contact cavity cover (7) is mounted above the coil end cover (6); a contact clamping seat (8) is arranged inside the contact cavity cover (7); the upper end of the drive shaft (5) passes through the coil end cover (6) and is connected to the contact clamping seat (8); a moving contact (9) is installed in the contact clamping seat (8); an auxiliary positioning contact seat (9) is fixedly mounted above the contact clamping seat (8); 10), a spring sheet (11) is mounted on the auxiliary positioning contact seat (10), auxiliary contacts (12) are mounted on both ends of the upper surface of the spring sheet (11), an auxiliary needle (13) is fixedly mounted on the upper surface of the contact cavity cover (7), the lower end of the auxiliary needle (13) passes through the contact cavity cover (7) and corresponds to the auxiliary contact (12); a static contact (15) is mounted on the upper shell (2), the lower end of the static contact (15) passes through the contact cavity cover (7) and corresponds to the moving contact (9) up and down.
2. A high voltage DC relay according to claim 1, characterized in that: The contact clamping seat (8) comprises an insulating base (81), the insulating base (81) is connected to the driving shaft (5), a contact clamp (82) is fixedly installed on the top of the insulating base (81), the cross section of the contact clamp (82) is an n-shaped structure, a contact positioning piece (83) is arranged in the inner cavity of the contact clamp (82), a spring (84) is installed between the lower surface of the contact positioning piece (83) and the upper surface of the insulating base (81), the moving contact (9) is installed in the contact positioning piece (83), an armature block (85) is fixedly installed on the upper wall of the inner cavity of the contact clamp (82), and the upper surface of the contact positioning piece (83) is in contact with the lower surface of the armature block (85).
3. A high voltage DC relay according to claim 2, characterized in that: The contact clamp (82) comprises an n-type upper clamp (821) and two arc portions (822) bent outwards, the two arc portions (822) are respectively located at two ends of the n-type upper clamp (821), the lower end of the arc portion (822) is fixedly connected to the insulating base (81) via a connecting portion (823), and the n-type upper clamp (821), the arc portion (822) and the connecting portion (823) are arranged as an integrated structure; Positioning protrusions (87) are provided at both left and right ends of the front and rear side surfaces of the contact positioning piece (83); the positioning protrusions (87) are respectively located on the front and rear sides of the n-type upper clamp (821); the maximum distance between the two positioning protrusions (87) located on the front side surface is smaller than the minimum distance between the two arc portions (822); and the maximum distance between the two positioning protrusions (87) located on the front side surface is larger than the distance between the left and right side surfaces of the n-type upper clamp (821).
4. A high voltage DC relay according to claim 3, characterized in that: A square hole (824) is provided in the middle of the arc portion (822).
5. A high voltage DC relay according to claim 3, characterized in that: Positioning ribs (18) are provided on both left and right side surfaces of the inner wall of the contact cavity cover (7), and the positioning ribs (18) are in contact with the outer surface of the arc portion (822).
6. A high voltage DC relay according to claim 1, characterized in that: The inner cavity of the upper shell (2) is also provided with two magnet positioning plates (16), and the inner side surfaces of the magnet positioning plates (16) are both installed with magnetic steels (17), and the two magnetic steels (17) respectively correspond to the contact positions of the moving contact (9) and the static contact (15).