CN115938866A - Direct current relay - Google Patents

Abstract

The embodiment of the invention discloses a direct-current relay which comprises a static iron core, a movable iron core, a push rod seat and a damping washer, wherein the bottom of the push rod penetrates through a moving through hole of the static iron core and is fixedly connected with the movable iron core, the push rod seat is fixedly arranged at the top of the push rod, and the damping washer is sleeved on the outer side of the push rod and is arranged at the top of the static iron core. When the direct current relay is released, the push rod pushes the push rod seat to impact the damping washer when being close to the static iron core, the damping washer made of rubber has better temperature resistance and elasticity, impact energy can be absorbed, noise is reduced, and meanwhile, the porous cellular structure of the damping washer can further absorb the impact energy and reduce the noise, so that the damping and silencing capacity of the direct current relay can be further improved. Meanwhile, the rubber damping washer is beneficial to reducing the generation of friction debris between the moving part and the fixing part, and the mechanical life and the reliability of the direct-current relay are effectively improved.

Description

Direct current relay

Technical Field

The invention relates to the technical field of relays, in particular to a direct-current relay.

Background

The DC relay is a DC control electric device, and generally comprises a control system, a contact system, a movement mechanism and a sealing system. When power is supplied to the coil, the coil generates a magnetic field to generate attraction force on the movable iron core, the movable iron core moves upwards, the counterforce spring is compressed to generate counterforce, and when the movable contact bridge contacts the static contact, the contact spring is also compressed to generate counterforce. When the movable iron core contacts the static iron core, the movement stops, the movable contact bridge and the static contact form reliable contact, the two static contacts are conducted, and the controlled external loop is conducted. When the coil is powered off, the attraction disappears, the contact spring and the counter-force spring act simultaneously to enable the movable iron core to move downwards, when the movable contact bridge is separated from the fixed contact, the counter-force of the contact spring disappears, the counter-force spring continues to provide counter-force to enable the movable iron core to move downwards until the push rod seat contacts the fixed iron core, the movable iron core returns to the original position at the moment, and the controlled external loop is completely disconnected.

The push rod seat and the static iron core of the existing direct current relay adopt a direct contact mode or are provided with a metal flat gasket. The direct-current relay has the characteristics of quick release action and short release time, so that when the direct-current relay is released, the push rod seat can impact the metal flat washer to generate larger noise; simultaneously, push rod seat (plastic part) and quiet iron core or metal plain washer direct contact can produce the plastic piece at the striking in-process repeatedly, drop the motion that influences the push rod in the gap of push rod and quiet iron core easily to influence direct current relay's life and reliability.

Disclosure of Invention

In view of this, embodiments of the present invention provide a dc relay, which can absorb impact energy and reduce noise by providing a rubber damping gasket having a porous honeycomb structure, and at the same time, is helpful to reduce generation of friction debris between a moving member and a fixed member, thereby effectively improving the mechanical life and reliability of the dc relay.

An embodiment of the present invention provides a dc relay, including:

a stationary core having a moving through-hole;

the movable iron core is positioned below the static iron core;

the bottom of the push rod penetrates through the moving through hole of the static iron core and is fixedly connected with the movable iron core;

the push rod seat is positioned above the static iron core and fixedly installed at the top of the push rod, and the push rod pushes the push rod seat to be far away from or close to the static iron core;

the shock-absorbing gasket cup joints the outside of push rod, the shock-absorbing gasket sets up the top of quiet iron core, just the shock-absorbing gasket is located the below of push rod seat, the shock-absorbing gasket is the inside rubber packing ring that has porous cellular structure.

Further, the top of quiet iron core be provided with the recess of removal through-hole intercommunication, damping washer fixes in the recess, damping washer's hole with removal through-hole intercommunication.

Furthermore, the top of the static iron core is also provided with an annular riveting groove which is annularly arranged at the outer side of the groove and is laterally communicated with the groove, and the depth of the annular riveting groove is greater than that of the groove;

the damping washer comprises a washer main body and an annular boss, the annular boss is arranged along the outer side surface of the washer main body, the outer side surface of the washer main body is formed in a downward protruding mode, the annular boss is connected to the annular riveting groove in a clamped mode, and the washer main body is arranged in the groove.

Further, the area of the bottom of the push rod seat is smaller than or equal to that of the shock-absorbing washer, and the top surface of the shock-absorbing washer extends out of the groove.

Further, the dc relay further includes:

two static contacts;

the movable contact bridge is connected and arranged above the push rod seat and below the two static contacts, and two movable contacts of the movable contact bridge are arranged opposite to the two static contacts;

the push rod seat pushes the two moving contacts of the moving contact bridge to be connected with or disconnected from the two fixed contacts.

Further, the dc relay further includes:

the stop plate comprises a bearing plate and two fixed side arms, the two fixed side arms are arranged on two sides of the bearing plate along the width direction of the movable contact bridge, the bearing plate is buckled on the top surface of the movable contact bridge, and the two fixed side arms respectively extend to two sides of the push rod seat and are fixedly connected with the push rod seat;

the first elastic piece is connected between the push rod seat and the movable contact bridge and is positioned between the two fixed side arms.

Further, the dc relay further includes:

a magnetic pole plate having a fixing through hole;

the ceramic seat and the magnetic pole plate are surrounded to form an arc extinguish chamber, and the two fixed contacts are connected with the top of the ceramic seat and extend into the arc extinguish chamber;

a connecting ring connected between the ceramic holder and the magnetic pole plate;

the sleeve is positioned below the magnetic pole plate and fixedly connected with the magnetic pole plate, and the sleeve is communicated with the arc extinguish chamber through the fixing through hole;

the second elastic piece is sleeved on the outer side of the push rod, and two ends of the second elastic piece are respectively connected with the static iron core and the movable iron core;

wherein, the bottom of quiet iron core is located just in the sleeve the top of quiet iron core is followed fixing hole inserts in the arc extinguish chamber, quiet iron core with the sleeve with magnetic pole plate fixed connection, move the iron core portable set up in just be located in the sleeve the below of quiet iron core, the push rod seat is located in the arc extinguish chamber, the top of push rod with push rod seat fixed connection, the bottom of push rod is the activity in proper order and is passed damping washer quiet iron core second elastic component with move iron core fixed connection.

Further, the dc relay further includes:

the first magnetic conduction block is fixedly arranged at the top of the inner side of the ceramic seat and is positioned between the two fixed contacts;

the second magnetic conduction block is of a U-shaped structure;

the bearing plate is provided with two openings positioned at two sides of the movable contact bridge, the movable contact bridge is connected between two side walls of the second magnetic conduction block, and the two side walls of the second magnetic conduction block respectively extend out of the corresponding openings from bottom to top to be opposite to the first magnetic conduction block.

Further, the dc relay further includes:

the U-shaped magnetic yoke is positioned below the magnetic pole plate, and two side surfaces of the U-shaped magnetic yoke are respectively connected with two sides of the magnetic pole plate along the length direction;

the coil framework is arranged between the magnetic pole plate and the bottom surface of the U-shaped magnetic yoke and is sleeved outside the sleeve;

the coil is sleeved on the outer side of the coil framework;

the two magnetic steels are respectively arranged on the outer sides of two side surfaces of the ceramic seat along the length direction and are positioned above the magnetic pole plate;

two magnetic conduction plates which are oppositely arranged surround the magnetic steel and the outer side of the ceramic seat and are positioned above the magnetic pole plates.

Furthermore, the bottom surface of the U-shaped magnetic yoke is convexly provided with a magnetic conduction tube, the sleeve extends into the magnetic conduction tube, and the coil framework is sleeved on the outer side of the magnetic conduction tube.

Further, the dc relay further includes:

the upper insulating shell and the lower insulating shell are connected to the outer sides of the magnetic conduction plate, the magnetic pole plate, the U-shaped magnetic yoke and the sleeve in a buckling mode, and the two static contacts are exposed out of the top of the upper insulating shell;

and one end of the connecting terminal is connected with the coil, and the other end of the connecting terminal penetrates through the U-shaped magnetic yoke and the lower insulating shell to be externally connected with a control power supply.

The embodiment of the invention provides a direct-current relay, wherein a damping washer made of rubber is arranged at the top of a static iron core, a push rod pushes a push rod seat to impact the damping washer when approaching the static iron core, the damping washer made of rubber has better temperature resistance and elasticity, can absorb impact energy and reduce noise, and meanwhile, a porous cellular structure of the damping washer can further absorb the impact energy and reduce the noise, so that the damping and noise elimination capacity of the direct-current relay can be further improved. Meanwhile, the rubber damping washer is beneficial to reducing the generation of friction debris between the moving part and the fixing part, and the mechanical life and the reliability of the direct-current relay are effectively improved.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

fig. 1 is a sectional view of a dc relay of an embodiment of the present invention;

fig. 2 is a sectional view of an internal structure of a direct current relay of the embodiment of the present invention;

FIG. 3 is a schematic structural view of a cushion ring according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view of a stationary core and a cushion ring according to an embodiment of the present invention;

FIG. 5 is a cross-sectional view of another stationary core and cushion ring of an embodiment of the present invention;

FIG. 6 is an exploded view of a stationary core and a cushion ring according to an embodiment of the present invention;

FIG. 7 is a schematic connection diagram of the push rod, the push rod seat and the movable contact bridge according to the embodiment of the invention;

fig. 8 is a schematic structural view of a second magnetic conductive block according to an embodiment of the present invention;

FIG. 9 is a schematic structural view of a stopper plate of an embodiment of the present invention;

fig. 10 is a schematic structural view of a magnetic conductive plate according to an embodiment of the present invention;

fig. 11 is a schematic structural view of a U-shaped yoke according to an embodiment of the present invention;

fig. 12 is a schematic structural diagram of a bobbin according to an embodiment of the present invention.

Reference numerals:

1-a stationary iron core; 2-moving the through hole; 3-a movable iron core; 4-a push rod; 5-a push rod seat; 6-a cushion ring; 61-a gasket body; 62-annular boss; 7-a groove; 8-annular riveting grooves; 9-static contact; 10-a movable contact bridge; 11-a stop plate; 111-bearing plates; 112-a fixed side arm; 113-an opening; 12-a first elastic member; 13-a magnetic pole plate; 131-a fixing through hole; 14-a ceramic seat; 15-an arc extinguishing chamber; 16-a connecting ring; 17-a sleeve; 18-a second elastic member; 19-a first magnetically conductive block; 20-a second magnetic conduction block; 21-U-shaped magnetic yoke; 22-a coil former; 23-a coil; 24-magnetic steel; 25-a magnetic conductive plate; 26-a magnetic conduction cylinder; 27-an upper insulating shell; 28-lower insulating shell; 29-connection terminal.

Detailed Description

The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details. Well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention.

Further, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are intended to be inclusive and mean that, for example, they may be fixedly connected or detachably connected or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

Unless the context clearly requires otherwise, throughout this application, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including, but not limited to".

In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

Fig. 1-2 are schematic structural diagrams of the dc relay of the present embodiment. As shown in fig. 1 and fig. 2, the dc relay includes a ceramic base 14, a magnetic pole plate 13, two stationary contacts 9, a moving contact bridge 10, a stationary iron core 1, a moving iron core 3, a push rod 4, and a push rod base 5. Wherein both the ceramic holder 14 and the magnetic pole plate 13 enclose an arc extinguishing chamber 15. Two stationary contacts 9 and a moving contact bridge 10 are arranged in an arc extinguishing chamber 15.

Specifically, the ceramic base 14 has a receiving space with a downward opening, and the magnetic pole plate 13 is connected below the ceramic base 14, and both the receiving spaces are closed to form a closed arc-extinguishing chamber 15. Two symmetrical contact through holes are formed at the top of the ceramic seat 14, and the two fixed contacts 9 are connected with the top of the ceramic seat 14 and respectively penetrate through the two contact through holes to extend into the arc extinguish chamber 15, as shown in fig. 2. Wherein, a circle of solder sheet can be respectively placed between the junction of the top outer sides of the two static contacts 9 and the ceramic base 14, and then the two static contacts are placed in a brazing furnace to be welded into a whole by high-temperature melting, and the arc extinguish chamber 15 is sealed to prevent electric arc from leaking, thereby improving reliability.

The shape of the ceramic seat 14 and the accommodating space therein can be of a columnar structure with a rectangular, circular, oval, polygonal and the like cross section, and can be specifically set according to the actual product requirements. The ceramic base 14 can be made of high-temperature-resistant and insulating materials, so that electric arcs generated by the direct-current relay can be extinguished more conveniently, the service life of the direct-current relay is prolonged, and the safety factor of use of the direct-current relay is improved.

The dc relay further comprises a connecting loop 16, as shown in fig. 1 and 2. A connecting ring 16 is connected between the ceramic holder 14 and the pole plate 13. Specifically, the connection ring 16 includes a vertical portion connected to the bottom of the ceramic holder 14 and an edge portion connected to the bottom edge of the vertical portion and extending outward in the circumferential direction of the ceramic holder 14. The vertical portion is an annular structure having the same shape as the ceramic holder 14 and the arc extinguishing chamber 15. The ceramic seat 14 is fixedly connected with the magnetic pole plate 13 through the connecting ring 16, so that the air tightness of the direct current relay can be ensured. The connection ring 16 may be formed of kovar (also called iron-nickel-cobalt alloy), SPCC (cold rolled carbon steel sheet or steel strip), copper or copper alloy, or stainless steel, and the like, and is used for welding with the magnetic pole plate 13. In this embodiment, the connecting ring 16 and the ceramic mount 14 may be fixedly connected by brazing. Specifically, a ring of solder sheet is placed between the joint of the connecting ring 16 and the ceramic base 14, and then placed in a brazing furnace where it is melted at a high temperature and thereby welded together. The magnetic pole plate 13 is disposed below the joint ring 16 and welded to an edge portion of the joint ring 16.

Specifically, the moving contact bridge 10 and the push rod base 5 are both disposed within the arc extinguishing chamber 15, as shown in fig. 1 and 2. The moving contact bridge 10 is connected and arranged above the push rod seat 5 and below the two fixed contacts 9, and the two moving contacts of the moving contact bridge 10 are arranged opposite to the two fixed contacts 9. The push rod base 5 is controlled to push the movable contact bridge 10 to move up and down, so that the two movable contacts are communicated or disconnected with the two fixed contacts 9. In this embodiment, the movable contact bridge 10 has a strip-shaped plate structure, as shown in fig. 7. Two ends of the movable contact bridge 10 are respectively arranged towards the two static contacts 9.

The magnetic pole plate 13 has a fixing through hole 131 as shown in fig. 2. The dc relay further comprises a sleeve 17, as shown in fig. 1 and 2. Wherein the sleeve 17 is connected below the pole plate 13. The connecting edge at the opening of the sleeve 17 is fixedly connected with the magnetic pole plate 13 outside the fixing through hole 131, so that the sleeve 17 is communicated with the arc extinguishing chamber 15 through the fixing through hole 131. The sleeve 17 and the magnetic pole plate 13 are sealed together by welding, so that the arc extinguishing chamber 15 is sealed and the electric arc is prevented from leaking. Alternatively, the fixing through-hole 131 is located at the center position of the magnetic pole plate 13.

The push rod 4 is fixedly arranged below the push rod seat 5 and is inserted into the sleeve 17 through the fixing through hole 131. The push rod 4 is used for pushing the push rod seat 5 to drive the movable contact bridge 10 to move up and down.

Further, the bottom of the static iron core 1 is located in the sleeve 17 and is fixedly connected with the sleeve 17; the top of the stationary iron core 1 is inserted into the arc extinguish chamber 15 from the fixing through hole 131, and the stationary iron core 1 is fixedly connected with the magnetic pole plate 13, as shown in fig. 2. That is, the top and bottom of the stationary core 1 are different in size and are matched with the size of the fixing through-hole 131 and the size of the sleeve 17, respectively. The movable iron core 3 is arranged in the sleeve 17 and is located below the stationary iron core 1, as shown in fig. 2. Wherein, the movable iron core 3 can move in the sleeve 17 below the static iron core 1.

Wherein the stationary core 1 has a moving through-hole 2, as shown in fig. 4-6. And one end of the push rod 4 departing from the push rod seat 5 penetrates through the movable through hole 2 and then is fixedly connected with the movable iron core 3. The push rod 4 is movable within the moving through-hole 2. When the direct-current relay is closed for use, the coil is electrified to generate a magnetic field, electromagnetic force which is mutually attracted is generated between the static iron core 1 and the movable iron core 3, the movable iron core 3 drives the push rod 4 to move upwards, and the push rod 4 pushes the movable contact bridge 10 to move upwards through the push rod seat 5. When the movable iron core 3 contacts the static iron core 1, the movement stops, the movable contact bridge 10 and the static contact 9 are contacted, the two static contacts 9 are conducted, and the controlled external loop is conducted. When the coil is powered off, the mutually attracted electromagnetic force disappears, the movable iron core 3 drives the push rod 4, the push rod seat 5 and the movable contact bridge 10 to move downwards, the movable contact bridge 10 is separated from the static contact 9 until the push rod seat 5 contacts the static iron core 1, the movable iron core 3 returns to the original position at the moment, and the controlled external loop is completely disconnected. In some examples, the plunger 3 is located at the bottom (i.e., the home position) of the sleeve 17 when the coil is de-energized.

The dc relay further comprises a second resilient member 18, which is arranged inside the sleeve 17, as shown in fig. 1 and 2. The second elastic part 18 is sleeved on the outer side of the push rod 4, and two ends of the second elastic part 18 are respectively fixedly connected with the static iron core 1 and the movable iron core 3. The push rod 4 penetrates out of the static iron core 1, penetrates through the second elastic piece 18 and is fixed in the movable iron core 3. In the process that the movable iron core 3 moves upwards, the second elastic element 18 is compressed to generate a counter force, and when the coil is powered off, the second elastic element 18 can provide the counter force for the movable iron core 3 to move the movable iron core 3 downwards, so that the movable contact bridge 10 is separated from the static contact 9. The second elastic member 18 is a spring, but may have other elastic structures. The sleeve 17 may be made of stainless steel or the like.

In the example of the application, a damping washer 6 is arranged between the push rod seat 5 and the stationary iron core 1, the damping washer 6 is arranged on the top of the stationary iron core 1, and the damping washer 6 is sleeved on the outer side of the push rod 4, as shown in fig. 1 and 2. When the coil is powered off, the movable iron core 3 drives the push rod 4, the push rod seat 5 and the movable contact bridge 10 to move downwards, and the push rod seat 5 gradually stops moving after impacting the damping washer 6. The shock-absorbing gasket 6 can realize the impact shock-absorbing silencing effect between the push rod seat 5 and the static iron core 1 during power failure. Specifically, the cushion ring 6 absorbs impact shock by its own elasticity, reducing noise.

Because the working temperature range of the direct current relay is-40 ℃ to 85 ℃, the damping washer 6 can be made of rubber synthetic material with better temperature resistance and elasticity, and the damping and noise elimination capability of the direct current relay can be improved.

In the embodiment of the present application, the push rod seat 5 is made of high temperature resistant plastic insulation, so as to ensure good electrical insulation. The static iron core 1 is made of metal. Add wear-resisting and the good rubber packing ring of toughness between the quiet iron core 1 of the push rod seat 5 of plastic material and metal, help slowing down the clastic production of friction between push rod seat 5 and the quiet iron core 1, effectively prolong direct current relay's mechanical life, promote the reliability.

Alternatively, the cushion ring 6 has a porous honeycomb structure inside, as shown in fig. 3. The shock absorption gasket 6 with the porous honeycomb structure can further absorb impact energy and noise generated by impact, so that the shock absorption and noise elimination capability of the direct current relay can be further improved.

In some examples, the top of the stationary core 1 is provided with a groove 7, and the groove 7 is in communication with the moving through-hole 2, as shown in fig. 4. Wherein, the cushion ring 6 is fixed in the groove 7, and the inner hole of the cushion ring 6 is communicated with the mobile through hole 2. The bottom of the push rod 4 sequentially and movably penetrates through the damping washer 6, the static iron core 1, the second elastic part 18 and the movable iron core 3 to be fixedly connected.

Further, the area of the bottom of the push rod seat 5 is smaller than or equal to the area of the damping washer 6, so that the push rod seat 5 can be in full contact with the damping washer 6 for damping and absorbing energy, and the push rod seat 5 is prevented from colliding with the static iron core 1 when moving downwards. Preferably, the top surface of the shock-absorbing washer 6 extends out of the groove 7, so that the push rod seat 5 can contact with the shock-absorbing washer 6 to absorb shock and absorb energy first when moving downwards, and noise is reduced.

In other examples, the top of the stationary core 1 is provided with a groove 7 and an annular rivet groove 8, as shown in fig. 6. The groove 7 is communicated with the movable through hole 2, the annular riveting groove 8 is annularly arranged on the outer side of the groove 7 and is communicated with the groove 7 in the lateral direction, and the depth of the annular riveting groove 8 is larger than that of the groove 7, as shown in fig. 6. The cushion ring 6 includes a ring body 61 and an annular boss 62, and the ring body 61 has an inner hole communicating with the moving through-hole 2. The annular boss 62 is located below the gasket main body 61, the outer diameter of the annular boss 62 is the same as that of the gasket main body 61, and the inner diameter of the annular boss 62 is larger than the inner hole of the gasket main body 61, as shown in fig. 6. The annular boss 62 is clamped in the annular riveting groove 8, and the gasket main body 61 is arranged in the groove 7, as shown in fig. 5. Annular riveting groove 8 and recess 7's structural design for quiet iron core 1's centre has the arch, and cushion ring 6 covers in protruding and the joint is in annular riveting groove 8, prevents that the foreign matter from entering into the gap between push rod 4 and quiet iron core 1 and influencing the motion.

Further, the area of the bottom of the push rod seat 5 is smaller than or equal to the area of the gasket main body 61, so that the push rod seat 5 can be in full contact with the damping gasket 6 for damping and absorbing energy, and the push rod seat 5 is prevented from colliding with the static iron core 1 when moving downwards. Preferably, the top surface of the shock-absorbing washer 6 protrudes from the groove 7, so that the push rod seat 5 can firstly contact with the shock-absorbing washer 6 when moving downwards, thereby reducing noise.

Further, the dc relay further includes a stopper plate 11 and a first elastic member 12, as shown in fig. 1 and 2. The stopper plate 11 includes a receiving plate 111 and two fixing side arms 112, as shown in fig. 9. The two fixing side arms 112 are disposed on two sides of the receiving plate 111 along the width direction of the movable contact bridge 10, and form a U-shaped structure. The receiving plate 111 is fastened above the moving contact bridge 10, and moving contacts at two ends of the moving contact bridge 10 are located at the outer side of the receiving plate 111, as shown in fig. 7. The two fixed side arms 112 respectively extend downward to two sides of the push rod base 5 and are fixedly connected with the push rod base 5. Two ends of the first elastic element 12 are fixedly connected with the push rod seat 5 and the movable contact bridge 10 respectively, as shown in fig. 7.

In the process that the movable iron core 3 moves upwards, when the push rod base 5 pushes the movable contact bridge 10 to contact with the static contact 9 (in the process, the second elastic piece 18 is compressed to generate a counter force, and the stop plate 11, the first elastic piece 12 and the push rod base 5 move synchronously), the position of the movable contact bridge 7 is fixed, the push rod base 5 continues to move upwards for a certain distance, within the moving distance, the push rod base 5 pushes the stop plate 11 to move upwards, the bearing plate 111 is separated from the movable contact bridge 10, and the first elastic piece 12 is compressed to generate a counter force. When the coil is powered off, the attraction force disappears, the first elastic piece 12 and the second elastic piece 18 act simultaneously to enable the movable iron core 3 to move downwards, when the movable contact bridge 10 is separated from the static contact 9, the counter force of the first elastic piece 12 disappears, the second elastic piece 18 continues to provide counter force to enable the movable iron core 3 to move downwards until the push rod seat 5 contacts the static iron core 1, at the moment, the movable iron core 3 returns to the original position, and the controlled external loop is completely disconnected.

In this embodiment, the stop plate 11 and the first elastic element 12 are arranged to provide a certain over travel displacement during over travel (i.e. after the movable contact bridge 10 contacts the stationary contact 9, it continues to move upwards). When the first elastic member 12 is compressed to generate a counter force, the counter force of the first elastic member 12 can also act on the movable contact bridge 10 to maintain the contact relationship between the movable contact bridge 10 and the stationary contact 9. The first elastic member 12 is a spring, and may be of other elastic structures. The stop plate 11 is made of a non-magnetic material or a weak magnetic material, so that the phenomenon that the stop plate 11 cannot move continuously or is blocked due to the influence of attraction when the stop plate moves over a distance is avoided.

Optionally, the first elastic member 12 is located between the two fixed side arms 112. The two fixed side arms 112 limit the first elastic member 12 to prevent the first elastic member 12 from inclining outward, so as to facilitate assembly.

Further, the dc relay further includes a first magnetic conductive block 19 and a second magnetic conductive block 20, as shown in fig. 1 and 2. The first magnetic conducting block 19 is located in the arc extinguish chamber 15, the first magnetic conducting block 19 is fixedly arranged at the top of the inner side of the ceramic base 14, and the first magnetic conducting block 19 is located between the two fixed contacts 9, as shown in fig. 1 and 2. The second magnetic conduction block 20 is fixedly connected to the moving contact bridge 10, and the second magnetic conduction block 20 is located between two moving contacts of the moving contact bridge 10 and is arranged opposite to the first magnetic conduction block 19, as shown in fig. 2.

After the push rod 4 pushes the movable contact bridge 10 to be communicated with the fixed contacts 9, the second magnetic conduction block 20 and the first magnetic conduction block 19 are close to each other, at this time, an external circuit is conducted, the movable contact bridge 10 can generate an annular magnetic field around the movable contact bridge 10 through a large current, the annular magnetic field forms a closed magnetic conduction loop through the first magnetic conduction block 19 and the second magnetic conduction block 20, a mutual attraction force is generated between the first magnetic conduction block 19 and the second magnetic conduction block 20, the second magnetic conduction block 20 drives the movable contact bridge 10 to be attracted upwards, and therefore the two movable contacts of the movable contact bridge 10 are in more stable contact with the two fixed contacts 9, and the working stability and the short circuit resistance of the direct current relay are greatly improved. The first magnetic conductive block 19 and the second magnetic conductive block 20 may be made of iron, cobalt, nickel, and alloys thereof.

In some examples, the second magnetic conductive block 20 has a U-shaped structure, as shown in fig. 8. The second magnetic conductive block 20 is fixedly connected below the moving contact bridge 10, and two side walls of the second magnetic conductive block 20 are located on two sides of the moving contact bridge 10 and extend from bottom to top, as shown in fig. 7. Two side walls of the second magnetic conduction block 20 extend to the top of the movable contact bridge 10 and are opposite to the first magnetic conduction block 19. The second magnetic block 20 has an exit hole at the bottom middle position, as shown in fig. 8. One end of the first elastic element 12 is fixedly connected with the push rod seat 5, and the other end passes through the through hole and is fixedly connected with the bottom of the movable contact bridge 10, as shown in fig. 7.

The receiving plate 111 has two openings 113, which are located on two sides of the movable contact bridge 10, as shown in fig. 7 and 9. The movable contact bridge 10 is connected between two side walls of the second magnetic conduction block 20, and the two side walls of the second magnetic conduction block 20 respectively extend out from the corresponding openings 113 from bottom to top to be opposite to the first magnetic conduction block 19. The two fixed side arms 112 are respectively located at the outer sides of the two side walls of the second magnetic conduction block 20, as shown in fig. 7. The structure enables the push rod 4 to push the push rod seat 5, and the movable contact bridge 10 and the second magnetic conduction block 20 can be driven to synchronously move.

Further, the dc relay further includes a U-shaped yoke 21, a coil frame 22, a coil 23, two magnetic steels 24, two magnetic conductive plates 25, an upper insulating case 27, a lower insulating case 28, and a connection terminal 29, as shown in fig. 1.

The U-shaped yoke 21 is connected below the magnetic pole plate 13, and both side surfaces of the U-shaped yoke 21 are respectively connected to both sides of the magnetic pole plate 13 along the length direction. The U-shaped yoke 21 forms a stable magnetic circuit with the magnetic pole plate 13. In some examples, the bottom surface of the U-shaped yoke 21 is provided with a flux sleeve 26 protruding upward, as shown in fig. 11. The magnetic conduction cylinder 26 is arranged opposite to the sleeve 17, and the sleeve 17 extends into the magnetic conduction cylinder 26. Therefore, the magnetic conduction cylinder 26 can provide support for the sleeve 17 and keep the position stable.

The bobbin 22 has an i-shaped bobbin structure, as shown in fig. 12. The coil frame 22 is sleeved outside the sleeve 17 and the magnetic conducting cylinder 26, and the coil frame 22 is abutted between the magnetic pole plate 13 and the bottom surface of the U-shaped magnetic yoke 21, as shown in fig. 1. The bobbin 22 has an insulating property. The coil 23 is wound around the bobbin 22. When the coil 23 is electrified, the coil 23 generates a magnetic field, the magnetic field forms a magnetic loop through the static iron core 1 and the movable iron core 3, the static iron core 1 and the movable iron core 3 generate mutually attracted electromagnetic force, the magnetic pole plate 13 and the U-shaped magnetic yoke 21 form a stable magnetic loop, and the core 3 drives the push rod 4 to push the movable contact bridge 10 to move to be in contact with the static contact 9, so that an external circuit is communicated.

The magnetic conductive plate 25 has a U-shaped structure, as shown in fig. 10. Two magnetic conducting plates 25 are oppositely arranged, surround the outer side of the ceramic seat 14 and are positioned above the magnetic pole plate 13 and the connecting ring 16. The two magnetic steels 24 are located between the ceramic base 14 and the magnetic conducting plate 25, and are respectively arranged on the outer sides of the two side surfaces of the ceramic base 14 along the length direction and located above the magnetic pole plate 13 and the connecting ring 16. The magnetic steel 24 can generate a permanent strong magnetic field, can rapidly break an electric arc to realize arc extinction, and the magnetic conduction plate 25 is used for forming a stable magnetic loop.

The upper insulating shell 27 and the lower insulating shell 28 are fastened and connected to the outer sides of all the above components in an up-down manner, that is, fastened to the outer sides of the magnetic conductive plate 25, the magnetic pole plate 13, the U-shaped magnetic yoke 21 and the sleeve 17, so as to form an insulating housing of the dc relay. The insulating shell is convenient for being fixedly installed with an external structure and being safely used.

The two fixed contacts 9 are exposed from the top of the upper insulating shell 27 for communicating with an external circuit. And a sealing ring and the like are arranged between the two static contacts 9 and the upper insulating shell 27 for sealing. One end of the connection terminal 29 is electrically connected with the coil 23, and the other end of the connection terminal passes through the U-shaped magnetic yoke 21 and the lower insulating shell 28 to form a socket, so that the direct current relay is conveniently externally connected with a control power supply to supply power.

In the assembling process of the direct current relay, gas capable of cooling electric arcs is filled into an arc extinguish chamber 15 of the direct current relay, so that the contact is prevented from being oxidized, the contact resistance is stable, and the reliability is improved.

To sum up, the direct current relay of this embodiment can show and reduce direct current relay closed impact, reduce direct current relay disconnection noise through set up the shock attenuation packing ring between push rod seat and quiet iron core to make direct current relay's mechanical life effectively improve.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (11)

1. A direct current relay, characterized in that the direct current relay comprises:

a stationary core (1) having a moving through-hole (2);

the movable iron core (3) is positioned below the static iron core (1);

the bottom of the push rod (4) penetrates through the moving through hole (2) of the static iron core (1) and is fixedly connected with the moving iron core (3);

the push rod seat (5) is positioned above the static iron core (1), the push rod seat (5) is fixedly installed at the top of the push rod (4), and the push rod (4) pushes the push rod seat (5) to be far away from or close to the static iron core (1);

shock-absorbing gasket (6), cup joint the outside of push rod (4), shock-absorbing gasket (6) set up the top of quiet iron core (1), just shock-absorbing gasket (6) are located the below of push rod seat (5), shock-absorbing gasket (6) are the inside rubber packing ring that has porous honeycomb structure.

2. The direct current relay according to claim 1, characterized in that a groove (7) communicated with the moving through hole (2) is formed in the top of the stationary iron core (1), the damping washer (6) is fixed in the groove (7), and an inner hole of the damping washer (6) is communicated with the moving through hole (2).

3. The direct current relay according to claim 2, characterized in that the top of the stationary core (1) is further provided with an annular riveting groove (8), the annular riveting groove (8) is annularly arranged outside the groove (7) and is laterally communicated with the groove (7), and the depth of the annular riveting groove (8) is greater than that of the groove (7);

damping washer (6) are including packing ring main part (61) and cyclic annular boss (62), cyclic annular boss (62) are followed the lateral surface of packing ring main part (61) is protruding downwards and is established the formation, cyclic annular boss (62) joint is in annular riveting groove (8), packing ring main part (61) set up in recess (7).

4. The direct current relay according to any one of claims 2-3, characterized in that the area of the bottom of the plunger seat (5) is smaller than or equal to the area of the cushion washer (6), the top surface of the cushion washer (6) protruding from the recess (7).

5. The dc relay according to claim 1, further comprising:

two stationary contacts (9);

the movable contact bridge (10) is arranged above the push rod seat (5) in a connecting manner and is positioned below the two static contacts (9), and the two movable contacts of the movable contact bridge (10) are arranged opposite to the two static contacts (9);

the push rod seat (5) pushes the two moving contacts of the moving contact bridge (10) to be communicated or disconnected with the two static contacts (9).

6. The direct current relay according to claim 5, characterized in that the direct current relay further comprises:

the stop plate (11) comprises a bearing plate (111) and two fixing side arms (112), the two fixing side arms (112) are arranged on two sides of the bearing plate (111) along the width direction of the movable contact bridge (10), the bearing plate (111) is buckled on the top surface of the movable contact bridge (10), and the two fixing side arms (112) respectively extend to two sides of the push rod seat (5) and are fixedly connected with the push rod seat (5);

the first elastic piece (12) is connected between the push rod seat (5) and the movable contact bridge (10), and the first elastic piece (12) is located between the two fixed side arms (112).

7. The dc relay according to claim 6, further comprising:

a magnetic pole plate (13) having a fixing through hole (131);

the ceramic seat (14) and the magnetic pole plate (13) surround to form an arc extinguish chamber (15), and the two static contacts (9) are connected with the top of the ceramic seat (14) and extend into the arc extinguish chamber (15);

a connecting ring (16) connected between the ceramic mount (14) and the magnetic pole plate (13);

the sleeve (17) is positioned below the magnetic pole plate (13) and fixedly connected with the magnetic pole plate (13), and the sleeve (17) is communicated with the arc extinguish chamber (15) through the fixing through hole (131);

the second elastic piece (18) is sleeved on the outer side of the push rod (4), and two ends of the second elastic piece (18) are respectively connected with the static iron core (1) and the movable iron core (3);

wherein, the bottom of quiet iron core (1) is located just in sleeve (17) the top of quiet iron core (1) is followed fixing hole (131) insert in explosion chamber (15), quiet iron core (1) with sleeve (17) with magnetic pole plate (13) fixed connection, move iron core (3) portable set up in sleeve (17) and be located the below of quiet iron core (1), push rod seat (5) are located in explosion chamber (15), the top of push rod (4) with push rod seat (5) fixed connection, the bottom of push rod (4) is in proper order movable to be passed damping washer (6) quiet iron core (1) second elastic component (18) with move iron core (3) fixed connection.

8. The dc relay according to claim 7, further comprising:

the first magnetic conduction block (19) is fixedly arranged at the top of the inner side of the ceramic seat (14), and the first magnetic conduction block (19) is positioned between the two fixed contacts (9);

the second magnetic conduction block (20), the said second magnetic conduction block (20) is the U-shaped structure;

the bearing plate (111) is provided with two openings (113) located on two sides of the movable contact bridge (10), the movable contact bridge (10) is connected between two side walls of the second magnetic conduction block (20), and two side walls of the second magnetic conduction block (20) respectively extend out of the corresponding openings (113) from bottom to top to be opposite to the first magnetic conduction block (19).

9. The dc relay according to claim 7, further comprising:

the U-shaped magnetic yoke (21) is positioned below the magnetic pole plate (13), and two side faces of the U-shaped magnetic yoke (21) are respectively connected with two sides of the magnetic pole plate (13) along the length direction;

the coil framework (22) is arranged between the magnetic pole plate (13) and the bottom surface of the U-shaped magnetic yoke (21), and the coil framework (22) is sleeved on the outer side of the sleeve (17);

a coil (23) that is fitted around the outside of the bobbin (22);

the two magnetic steels (24) are respectively arranged on the outer sides of two side surfaces of the ceramic seat (14) along the length direction and are positioned above the magnetic pole plate (13);

two magnetic conduction plates (25) which are oppositely arranged surround two magnetic steels (24) and the outer side of the ceramic seat (14) and are positioned above the magnetic pole plate (13).

10. The direct-current relay according to claim 9, wherein a magnetic conductive cylinder (26) is arranged on the bottom surface of the U-shaped magnetic yoke (21) in an upward protruding manner, the sleeve (17) extends into the magnetic conductive cylinder (26), and the coil bobbin (22) is sleeved outside the magnetic conductive cylinder (26).

11. The dc relay according to claim 10, further comprising:

the upper insulating shell (27) and the lower insulating shell (28) are connected to the outer sides of the magnetic conducting plate (25), the magnetic pole plate (13), the U-shaped magnetic yoke (21) and the sleeve (17) in a buckling mode, and the two static contacts (9) are exposed out of the top of the upper insulating shell (27);

and one end of the connecting terminal (29) is connected with the coil (23), and the other end of the connecting terminal penetrates through the U-shaped magnetic yoke (21) and the lower insulating shell (28) to be externally connected with a control power supply.

Images