Motor rotation clapper type high-voltage direct-current relay

Abstract

The invention relates to a high-voltage direct-current relay, in particular to a motor rotation clapper type high-voltage direct-current relay. A motor rotation clapper type high-voltage direct-current relay comprises a contact assembly and a driving assembly, the driving assembly comprises a driving motor, the contact assembly comprises a leading-out end and a movable contact spring, the output end of the driving motor is fixed to the middle of the movable contact spring, the inner end of the leading-out end extends to the side of the movable contact spring and is fixedly provided with a static contact, and the inner end of the leading-out end extends to the side of the movable contact spring. The movable contact spring is oppositely located between the inner ends of the two leading-out ends, the two movable contacts are located on one side of the two opposite sides of the movable contact spring respectively, and the static contact, the movable contacts and the movable contact spring are symmetrically arranged with the rotation axis of the movable contact spring as the center. The problem of pull-in rebound can be reduced and even solved as much as possible, the relay is lower in production cost, parts with low production process requirements can be adopted, the overall size can be miniaturized more easily, or the working current can be larger under the condition that the original size is guaranteed.

Description

Technical Field

[0001] The invention relates to a high-voltage direct current relay, in particular to a motor rotating snap-on type high-voltage direct current relay. Background Art

[0002] In a high-voltage DC relay, the coil in the magnetic circuit portion of the drive assembly is energized to move the push rod along its own axial direction, thereby driving the movable spring at the end of the push rod to move, so that the movable contact at the end of the movable spring contacts the static contact at the lead end. During the use of the relay, the movable contact and the static contact need to be kept in contact at all times to achieve long-term load conduction of the relay. During this period, the coil needs to be energized at all times, resulting in high energy consumption during use.

[0003] Chinese patent application number 201811151842.1 discloses an energy-saving relay, which includes a DC input power supply, high-voltage relay contacts, a coil, a step-down circuit module, a step-up circuit module, a logic judgment and command transmission circuit module, and a coil drive indication circuit module with a relay coil drive indicator light. High voltage is used at the moment of closure and low voltage is used at other times, thereby ensuring reliable operation and significantly reducing energy consumption.

[0004] However, the above solution has the following drawbacks: the power required to maintain contact between the moving and static contacts is still relatively high (at least 2W or more), and the circuit assembly is very complex to set up, with many electronic parts and many potential failure points; at the same time, a structure dedicated to placing the circuit assembly is required on the relay housing, which is not conducive to the miniaturization of the relay.

[0005] When the moving and static contacts come into contact, due to the small contact area (the actual contact is a microscopic raised point), according to the Lorentz force and the Holm effect, the current will generate a reverse repulsive force between the contacts. The direction of this force is opposite to the direction of movement of the push rod, trying to push the moving contact away from the static contact, which will cause the moving reed to deform or even shake as a whole, causing the moving contact and the static contact to separate instantly, thereby causing the problem of attraction and rebound.

[0006] Chinese patent application number 202310332878.4 discloses a high-voltage DC relay, in which a compression spring is sleeved on a push rod, a movable spring is slidably set on the push rod, and a limiter is provided at the upper end of the push rod to prevent the compression spring from detaching. The upper end of the compression spring supports the movable spring, and the lower end of the compression spring is supported on the boss of the push rod itself. The compression spring always applies a certain upward thrust to the movable spring to overcome the reverse repulsive force and enable the movable spring to slide relative to the push rod, thereby reducing or even overcoming the negative impact of the attraction rebound.

[0007] But because the compression spring needs to be pressed against the moving spring blade, the compression spring requires high rigidity and high production process. Meanwhile, the combination of thread glue and nut or anti-loose nut / ring is needed as a limiting piece to limit the moving spring blade from being separated, which makes the assembly of the moving spring blade more troublesome. SUMMARY

[0008] The motor rotating clapping type high-voltage DC relay of the present application can reduce the energy consumption when the moving contact and the static contact are in contact, can save energy, and can reduce the occurrence of the attraction bounce when the moving contact and the static contact are in contact.

[0009] To achieve the above-mentioned purpose, the motor rotating clapping type high-voltage DC relay of the present application comprises a contact assembly and a driving assembly, the driving assembly comprises a driving motor, the contact assembly comprises an outgoing end fixed with a static contact and a moving spring blade fixed with a moving contact, the output end of the driving motor is fixed in the middle of the moving spring blade, the inner end of the outgoing end extends to the side of the moving spring blade and is fixed with the static contact, the moving spring blade is located between the inner ends of the two outgoing ends, the two moving contacts are located on one side of the two opposite sides of the moving spring blade and correspond to the static contacts one by one, and the static contact, the moving contact and the moving spring blade are centrally symmetrically arranged with the rotation axis of the moving spring blade as the center.

[0010] When the relay of the present application needs to realize the contact conduction of the moving contact and the static contact, the driving motor works, the moving spring blade rotates under the action of the driving motor, the moving spring blade rotates under the action of the driving motor to make the moving contact approach or move away from the static contact, and the moving contact on the moving spring blade will approach and contact the static contact; when the moving contact contacts the static contact of the outgoing end, the conduction between the two outgoing ends is realized; when the relay is used and the circuit does not need to be conducted, the driving motor is controlled to reverse, so that the moving contact of the moving spring blade deviates from the static contact at the outgoing end, and the circuit is disconnected. That is, the motor rotates forward→ the moving spring blade rotates in→ the two pairs of moving and static contacts are closed at the same time→ the load is conducted, the motor reverses→ the moving spring blade rotates out→ the contact is disconnected→ the load is cut off.

[0011] After the moving contact and the static contact are closed, the driving motor of the present application can be de-energized and self-locked or keep a small current to maintain torque, so that the moving contact and the static contact do not need to be powered for the magnetic circuit part, which greatly improves the energy saving effect. The present application scheme can directly overcome the instantaneous reverse repulsive force between the moving contact and the static contact through the continuous output torque of the driving motor and the greatly improved torque of the driving motor driving the moving spring blade to rotate, so as to avoid the attraction bounce.

[0012] The present invention uses a rotating snap-fit ​​structure, which eliminates the need to power the magnetic circuit and set up circuit components. The drive motor can be directly controlled at the end user of the product without setting up additional circuit components. There is no need to worry about the problem of many potential failure points caused by a large number of electrical components, and there is no need to set up a PCB board structure dedicated to placing circuit components on the relay housing, which facilitates the miniaturization of the relay.

[0013] The present invention also addresses the assembly complexity associated with the axial sliding of the dynamic spring and the compression spring. It eliminates the need for conventional dynamic springs and mounting methods, nor does it require the use of compression springs with high rigidity and production process requirements. This facilitates assembly while also avoiding the difficulty in sourcing components. The dynamic spring of the present invention can utilize any existing linkage fixing structure for motor output components between the linkage shaft and the output end of the drive motor.

[0014] The drive motor of the present invention is less expensive than the magnetic circuit portion of a conventional relay. The drive motor is used to directly drive the moving reed, eliminating the need for a magnetic circuit system. This avoids the need for constant power supply when the moving and static contacts are engaged, and the problem of secondary engagement caused by the moving iron core failing to adhere to the yoke plate when the static contacts are in contact. It also reduces the overall height, making it easier to install the relay in height-restricted locations. The yoke plate of a conventional relay is not required to engage the moving iron core. The plate-shaped component corresponding to the yoke plate of the present invention can be made of insulating plastic. When the insulating cover is made of ceramic, the insulating cover and the plate-shaped component can be connected, fixed, and sealed with epoxy resin. When both the insulating cover and the plate-shaped component are made of the same insulating plastic, they can also be connected by glue potting and sealing. Since the materials are the same, even if the insulating cover and the plate-shaped component are connected by welding, the welding process requirements and costs are lower. Since the magnetic circuit portion is not required, the yoke cup used in conventional relays for enclosing the magnetic circuit and for magnetic shielding can also be made of insulating plastic, further reducing costs.

[0015] At the same time, when the two moving and static contacts are closed at the same time, the reverse repulsive force generated by them forms a pair of equal and opposite force couples in the plane of the moving spring, thereby at least partially offsetting the overturning moment acting on the moving spring, so as to further reduce the negative impact of the reverse repulsive force generated when the moving and static contacts are in instantaneous contact.

[0016] When the arrangement of the lead terminals and other components of the present invention adopts the arrangement method of a conventional relay, that is, the lead terminals are arranged vertically and the linkage shaft of the output terminal of the drive motor is arranged vertically, the movable spring of the present invention moves in a horizontal rotational direction, and the axial projection of the movable spring along its rotation axis is located between the inner ends of the two lead terminals, rather than being lifted and lowered in the vertical direction. Therefore, there is no need to worry about the space for accommodating the moving and static contacts being forced to be larger due to the thickness of the movable spring. The arrangement requirements of the movable spring of the present invention are relatively small. The width, length and thickness of the movable spring of the present invention can be made as large as possible, so that the relay of the present invention can use a larger current, or the entire relay can be made smaller while keeping the current unchanged, facilitating miniaturization.

[0017] Preferably, the end of the movable spring is connected to one end of a compression spring, and the other end of the compression spring is connected to a fixed position. When the movable spring rotates toward the static contact side under the action of the driving motor, the compression spring exerts a tendency force on the movable spring.

[0018] In addition to the motor torque, the tangential component of the spring is added to overcome the contact repulsion and reduce the peak power of the motor. After the motor stops, the spring can still provide holding force to prevent the contacts from opening.

[0019] When the driving motor drives the movable spring to rotate so that the movable contact rotates toward the static contact, the position of the connection end of the compression spring and the movable spring changes, and the force direction of the compression spring will be toward the end of the movable spring, so that the movable spring is subjected to a thrust to rotate toward the static contact. This thrust can overcome the instantaneous reverse repulsive force generated when the movable and static contacts come into contact.

[0020] After the driving motor drives the moving reed to rotate, the moving reed can continue to rotate under the action of the compression spring, which requires less output power from the driving motor; and the moving contact of the moving reed can maintain contact with the static contact under the action of the compression spring, so the driving motor does not need to work all the time, which can reduce the energy consumption of the relay.

[0021] Preferably, a compression spring is provided at each end of the movable spring in the longitudinal direction, and the movable spring and the compression spring are centrally symmetrically arranged about the rotation axis of the movable spring. The provision of compression springs at both ends ensures synchronization and stability when the movable contacts at both ends of the movable spring make contact with the static contacts.

[0022] Preferably, the end of the compression spring connected to the fixed portion is located relatively outside the movable spring in the circumferential direction, and the end of the compression spring connected to the fixed portion is further away from the static contact than the end connected to the movable spring.

[0023] The above arrangement reduces the passive rotational force to which the linkage shaft at the output end of the drive motor is subjected when the relay is not in use. Deflection can be avoided solely by the friction between the reduction gears inside the drive motor. There is no need to use a high-cost drive motor with a self-locking function, which facilitates maintaining the balance of the moving reed when the relay is not in use, thereby preventing the moving reed from deflecting.

[0024] Among them, the fixed part can be the annular part of the insulating cover located on the circumferential outside of the moving spring, or the extension part fixed to the top of the insulating cover and extending downward, or other parts supported on the plate body (corresponding to the yoke iron plate of a conventional relay) together with the insulating cover.

[0025] Preferably, when the movable spring is in a non-working state, the intersection point of the elastic force directions of the two compression springs is on the rotation axis.

[0026] When the movable spring is in its non-operating initial position (i.e., when the movable contact on the movable spring is not adjacent to or in contact with the stationary contact), the compression spring applies force to the movable spring toward its rotation axis. This arrangement further ensures the stability of the movable spring when not in use and improves the synchronization of its rotation.

[0027] Preferably, a mating column extending laterally is provided at the side wall of the end of the movable spring piece, and the side wall of the movable spring piece has a mating surface at the mating column, and the inner end of the compression spring is sleeved outside the mating column; when the movable spring piece is in a non-working state, the end of the compression spring contacts the mating surface.

[0028] When the drive motor is started, the end of the movable spring rotates, causing the inner end of the compression spring to deform to a certain extent, so that the compression spring can be pressed on the outer wall of the matching column, thereby making it easier to push the movable spring.

[0029] Preferably, an extension block is provided on a side of the end of the movable spring away from the static contact, and the matching surface and the matching column are provided on a side surface of the extension block.

[0030] The above arrangement can make the angle between the force direction of the compression spring and the static contact smaller after the movable spring piece rotates, making it easier for the compression spring to push the end of the movable spring piece.

[0031] Preferably, the extension direction of the mating column forms an angle with the length direction of the movable spring, and the plane where the mating surface is located is perpendicular to the extension direction of the mating column. The above arrangement can facilitate the direction of the elastic force of the compression spring to intersect the rotation axis, thereby ensuring the stability of the movable spring during use.

[0032] The application utilizes the self-locking of the driving motor (worm and gear, step motor holding brake or electronic brake) and the holding force provided by the compression spring after the driving motor stops, and the dynamic contact can be completely powered off after the attraction, which can greatly reduce the energy consumption of the relay in use and greatly increase the energy saving effect.

[0033] The application can real-time offset the instantaneous reverse repulsive force generated when the dynamic and static contacts are contacted by continuously outputting large torque of the driving motor + symmetric double compression spring assistance, which can reduce or even solve the attraction bounce problem as much as possible.

[0034] The application replaces the magnetic circuit part of the traditional relay by the motor rotation beating, fundamentally eliminates the complex structure of the magnetic circuit part and the dynamic spring part of the relay, can save the push rod, high stiffness compression spring, nut / retaining ring limiting part, magnetic circuit system (coil, core, yoke), can make the production cost of the relay lower, can use the parts with lower production process requirement, and can make the overall volume smaller or make the working current larger under the condition of ensuring the original volume. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is a sectional view of the application.

[0036] Figure 2 is a sectional view of the application when the contact assembly is in a non-working state.

[0037] Figure 3 is a sectional view of the application when the contact assembly is in a non-working state.

[0038] Figure 4 is a structural schematic view of the dynamic spring sheet of the application. DETAILED DESCRIPTION

[0039] The application will be further described below according to the drawings and specific embodiments.

[0040] As shown in Figure 1 , the embodiment discloses a motor rotation beating type high-voltage direct-current relay, which comprises a contact assembly, a driving assembly and a shell assembly, the shell assembly comprises an inner insulating cover 11, an insulating plate 12 and an outer insulating cover 13, a cavity for accommodating contacts of the contact assembly is formed between the inner insulating cover 11 and the insulating plate 12, the driving assembly comprises a driving motor 10, the shell of the driving motor is fixed with the insulating plate 12 and located on the lower side of the insulating plate 12, the inner insulating cover 11 is supported above the insulating plate 12, the inner insulating cover 11, the insulating plate 12 and the driving motor are located in the outer insulating cover 13, the outer insulating cover 13 is upwardly open, and the upper end of the outer insulating cover 13 and the upper end of the inner insulating cover 11 are sealed by epoxy resin.

[0041] Among them, the fixing structure of the outer insulating cover 13 of this embodiment can adopt the fixing method of the yoke iron cup of the existing high-voltage DC relay, the insulating plate 12 is tightly matched with the outer insulating cover 13, and the housing of the drive motor 10 and the outer insulating cover 13 and the insulating plate 12 can adopt a positioning structure that cooperates with conventional positioning protrusions and positioning grooves. Among them, the middle part of the insulating plate 12 of this embodiment is provided with a through positioning hole, and the housing of the drive motor 10 has a positioning portion 101 that extends into the positioning hole. The cross-sectional outer edge shape and size of the positioning portion 101 are the same as the cross-sectional shape and size of the positioning hole. Among them, the cross-sectional outer edge of the relay of this embodiment is circular, and a stop or threaded structure that cooperates with each other is provided between the lower end of the inner insulating cover 11 and the edge of the insulating plate 12. The lower end of the inner insulating cover 11 and the edge of the insulating plate 12 are sealed and connected by epoxy resin.

[0042] Depend on Figures 1 to 3 As shown, the contact assembly includes a stationary contact fixed to the lead terminal 14 and a moving contact fixed to the moving spring 2. In this embodiment, the middle portion of the moving spring 2 is fixed to the upper end of the linkage shaft 102 at the output end of the drive motor 10. The lead terminal 14 is fixed to the inner insulating cover 11 using the same fixing method as the lead terminals of a conventional relay. The inner end (lower end) of the lead terminal 14 extends into the cavity formed by the inner insulating cover 11 and the insulating plate 12, where the moving spring 2 is also located. The inner end (lower end) of the lead terminal 14 extends downward to the horizontal side of the moving spring 2. The axial projection of the moving spring 2 along its rotational axis is located between the inner ends of the two lead terminals 2. The two moving contacts are located on one of the opposite sides of the moving spring 2, corresponding one-to-one with the stationary contacts. The cross-section of the fixing hole for the moving spring 2 to the upper end of the linkage shaft 102 is D-shaped, and the upper end of the linkage shaft 102 is flat.

[0043] Depend on Figure 1 As shown, a fixing frame 121 is formed on the upper side of the insulating plate 12. A receiving slot for accommodating the magnet 15 is formed between the fixing frame and the insulating plate 12. A magnetic isolation plate 16 is provided below the magnet 15. The magnet 15 is located below the lead terminal 14. When the moving and static contacts make contact, the downward projection of the moving and static contact surfaces coincides with the downward projection of the magnet 15. The insulating plate 12 or fixing frame 121 is provided with a number of vertically extending limiting protrusions 122 for limiting the translational movement of the magnet 15 or the magnetic isolation plate 16. The magnet and magnetic isolation plate are secured within the receiving slot using sealant.

[0044] Depend on Figures 2 to 4 As shown, the ends of both ends of the movable reed 2 are connected to the inner end of a compression spring 3, and the outer end of the compression spring 3 is connected to a fixed part. The fixed part in this embodiment is the side wall of the inner insulating cover 11. The outer end of the compression spring 3 is located circumferentially outside the movable reed 2, and the outer end of the compression spring 3 is further deviated from the movable contact at the end of the movable reed 3 and the corresponding static contact than the inner end of the compression spring 3; the static contact, the movable contact, the movable reed 2, and the compression spring 3 are centrally symmetrically arranged with the rotation axis of the movable reed as the center.

[0045] When the relay is in a non-working state, the intersection point of the elastic force directions of the two compression springs 3 is on the rotation axis of the movable spring 2, and the elastic force directions of the two compression springs 3 are collinear; when the relay is in a working state and the movable spring 2 rotates toward the static contact side under the action of the drive motor 10, the compression spring 3 exerts a tendency force on the movable spring 2.

[0046] An extension block 21 is provided on the side of the end of the movable spring 2 away from the static contact. This extension block 21 is equipped with a laterally extending mating post 22. The extension block 21 has a mating surface 23 at the mating post 21. The plane of the mating surface 23 forms an angle with the end face of the movable spring 2 where the movable contact is located. The inner end of the compression spring 3 is sleeved around the mating post 21. A positioning post 111 is fixed to the side wall of the inner insulating cover 11, and the outer end of the compression spring 3 is sleeved around the positioning post 111. When the movable spring 2 is in the non-operating state, the end of the compression spring 3 contacts the mating surface 23, and the direction of the elastic force of the compression spring 3 is perpendicular to the plane of the mating surface 23.

[0047] Depend on Figure 2 As shown, the inner insulating cover 11 has a plurality of limit portions 112 extending downward, and the limit portions 112 and the static contacts are respectively located in one rotation direction of the two opposite rotation directions of the movable spring piece 2, and the limit portions 112 limit the excessive reset of the movable spring piece 2.

[0048] When assembling the relay of this embodiment, the drive motor 10 and the insulating plate 12 are first assembled, and the compression spring 3, the movable reed 2 and the inner insulating cover 11 are assembled, and the movable reed 2 is supported at the limit portion 112 by the compression spring 3; then the movable reed 2 and the linkage shaft 102 of the drive motor 10 are press-fitted. During press-fitting, a positioning member can be inserted through multiple upper and lower openings such as the lead-out terminal fixing hole and the exhaust pipe fixing hole of the inner insulating cover 11 to maintain the upper and lower relative positions of the movable reed; then, the insulating plate 12 made of insulating plastic and the inner insulating cover 11 made of insulating plastic are connected, fixed and sealed by a sealant such as epoxy resin; then, the lead-out terminal 14, the exhaust pipe and other components are installed, the outer insulating cover 13 is installed and sealed with glue, and an inert gas is filled into the chamber formed by the inner insulating cover 11 and the insulating plate 12.

[0049] This embodiment utilizes a self-locking mechanism when the drive motor is powered off, and the compression spring continues to provide holding force even after the drive motor stops. This allows for complete power loss after the moving contact closes, significantly reducing energy consumption during operation and significantly increasing energy savings. This embodiment utilizes the continuous high torque output of the drive motor combined with the assistance of symmetrical dual compression springs to effectively offset the instantaneous reverse repulsive force generated when the moving and static contacts meet, minimizing or even eliminating the problem of rebound.

[0050] The embodiment replaces the magnetic circuit part of the traditional relay with the motor rotation beat, fundamentally eliminates the complex structure of the magnetic circuit part and the moving spring part of the relay, saves a large number of parts, and makes the relay production cost lower and the relay smaller.

Claims

1. A motor-rotating snap-on high-voltage DC relay, comprising a contact assembly and a drive assembly, characterized in that: The drive assembly includes a drive motor, and the contact assembly includes an output terminal fixed with a static contact and a dynamic spring fixed with a dynamic contact. The output terminal of the drive motor is fixed to the middle of the dynamic spring, and the inner end of the output terminal extends to the side of the dynamic spring and is fixed with the static contact. The dynamic spring is relatively located between the inner ends of the two output terminals. The two dynamic contacts are respectively located on one of the opposite sides of the dynamic spring and correspond one-to-one to the static contacts. The static contact, the dynamic contact and the dynamic spring are centrally symmetrically arranged with the rotation axis of the dynamic spring as the center.

2. The motor-rotating snap-on high-voltage DC relay according to claim 1, characterized in that: The end of the movable spring is connected to one end of a compression spring, and the other end of the compression spring is connected to a fixed part. When the movable spring rotates toward the static contact side under the action of the driving motor, the compression spring exerts a tendency force on the movable spring.

3. The motor-rotating snap-on high-voltage DC relay according to claim 2, characterized in that: A compression spring is provided at each of the two ends of the movable spring in the length direction, and the movable spring and the compression spring are centrally symmetrically arranged with the rotation axis of the movable spring as the center.

4. The motor-rotating snap-on high-voltage DC relay according to claim 2 or 3, characterized in that: The end of the compression spring connected to the fixed portion is relatively located outside the circumferential direction of the movable spring piece, and the end of the compression spring connected to the fixed portion is further away from the static contact point than the end connected to the movable spring piece.

5. The motor-rotating snap-on high-voltage DC relay according to claim 3, characterized in that: When the movable spring is in a non-working state, the intersection point of the elastic force directions of the two compression springs is on the rotation axis.

6. The motor-rotating snap-on high-voltage DC relay according to claim 2 or 3, characterized in that: A mating column extending laterally is provided at the side wall of the end of the movable spring piece, and the side wall of the movable spring piece has a mating surface at the mating column, and the inner end of the compression spring is sleeved outside the mating column; when the movable spring piece is in a non-working state, the end of the compression spring contacts the mating surface.

7. The motor-rotating snap-on high-voltage DC relay according to claim 6, characterized in that: An extension block is provided on a side of the end of the movable spring piece away from the static contact point, and the matching surface and the matching column are arranged on a side surface of the extension block.

8. The motor-rotating snap-on high-voltage DC relay according to claim 6, characterized in that: The extending direction of the matching column forms an angle with the length direction of the movable spring piece, and the plane where the matching surface is located is perpendicular to the extending direction of the matching column.

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