CN112542355B - Direct current relay with improved short circuit resistance - Google Patents
Direct current relay with improved short circuit resistance Download PDFInfo
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- CN112542355B CN112542355B CN202011375877.0A CN202011375877A CN112542355B CN 112542355 B CN112542355 B CN 112542355B CN 202011375877 A CN202011375877 A CN 202011375877A CN 112542355 B CN112542355 B CN 112542355B
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- 230000003068 static effect Effects 0.000 claims abstract description 59
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- 238000003825 pressing Methods 0.000 claims abstract description 32
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- 238000000429 assembly Methods 0.000 claims abstract description 18
- 238000009434 installation Methods 0.000 claims abstract description 17
- 239000004020 conductor Substances 0.000 claims description 20
- 238000005192 partition Methods 0.000 claims description 19
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- 229910045601 alloy Inorganic materials 0.000 description 2
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- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
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- 229910052742 iron Inorganic materials 0.000 description 1
- 229910000833 kovar Inorganic materials 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
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- 229920000647 polyepoxide Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/16—Magnetic circuit arrangements
- H01H50/18—Movable parts of magnetic circuits, e.g. armature
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Electromagnets (AREA)
Abstract
The invention discloses a direct current relay with improved short circuit resistance, which comprises a shell, a magnetic circuit assembly, a movable contact mechanism, a static contact assembly and a magnetic conduction assembly, wherein: an installation cavity is formed in the shell, and the coil unit assembly, the movable contact mechanism and the magnetic conduction assembly are arranged in the installation cavity; when the coil unit is electrified, a magnetic field is generated to enable the movable iron core to move towards the internal magnetic circuit space, and the movable contact bridge is abutted against the two static contact assemblies, so that the two static contact assemblies are conducted. According to the direct current relay with improved short circuit resistance, when a system loop is short-circuited, the current intensity of the movable contact bridge is far greater than that of the relay in normal operation, the magnetic field intensity generated by the first magnetizer and the second magnetizer is increased sharply, the first magnetic force generated by the second magnetizer is greater than the repulsive force generated by the second elastic pressing piece and the movable contact bridge on the static contact assembly, and therefore the movable contact bridge can still be kept in conduction with the static contact assembly even under the short circuit condition.
Description
Technical Field
The invention relates to the technical field of relays, in particular to a direct current relay with improved short circuit resistance.
Background
For the direct current relay of the direct-acting magnetic circuit structure in the prior art, the internal part of the direct current relay is driven by a movable contact bridge and a fixed contact connected with the external part through a magnetic circuit system to realize the switching-on and switching-off functions, when the direct current relay faces to a short circuit condition in practical application, because the current passing through the movable contact bridge is very large, the contact area of the movable contact bridge and the fixed contact can generate electric repulsive force, and the repulsive force can push the movable contact bridge open under the condition of enough large enough, so that the relay is abnormally disconnected, arcing and even explosion are caused.
For the direct current relay applied in the current electric automobile industry, the battery system has larger energy, so that the short circuit resistance of the direct current relay is required to be further improved, and the external dimension and the cost of the switch device are compatible.
There is therefore a need for a relay with a certain resistance to short circuits.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a direct current relay with improved short circuit resistance, which is used for solving the problem that a movable contact bridge and a fixed contact are disconnected due to short circuit of the relay in the prior art.
In order to achieve the technical purpose, the technical scheme of the invention is as follows: the utility model provides a direct current relay that short circuit resistance promoted, its includes casing, magnetic circuit subassembly, movable contact mechanism, static contact subassembly and magnetic conduction subassembly, wherein: an installation cavity is formed in the shell, the coil unit assembly, the movable contact mechanism and the magnetic conduction assembly are arranged in the installation cavity, and the static contact assembly extends into the installation cavity relative to the movable contact mechanism; the movable contact mechanism comprises a driving rod, a movable contact bridge, a first elastic pressing piece and a second elastic pressing piece, wherein the movable contact bridge is movably connected with the driving rod, the static contact component points to the movable contact bridge in a first direction, one end of the first elastic pressing piece is fixed in the mounting cavity, the other end of the first elastic pressing piece drives the driving rod to move in the first direction, one end of the second elastic pressing piece is connected with the driving rod, and the other end of the second elastic pressing piece drives the movable contact bridge to be reversely kept on the driving rod along the first direction; the magnetic circuit assembly comprises a coil unit and a movable iron core, and the driving rod is fixedly connected with the movable iron core; when the coil unit is electrified, a magnetic field is generated to drive the movable iron core to reversely move along a first direction, the movable contact bridge is abutted against the two static contact assemblies, the two static contact assemblies are conducted, and when the coil unit is deenergized, the first elastic pressing piece drives the driving rod to move along the first direction, and the movable contact bridge is separated from the two static contact assemblies; the magnetic conduction assembly comprises a first magnetic conductor and a second magnetic conductor, the first magnetic conductor is fixed in the mounting cavity, the second magnetic conductor is connected with the movable contact bridge, and the first magnetic conductor and the second magnetic conductor are surrounded on the periphery of the movable contact bridge; when the system loop is short-circuited, the intensity of current flowing through the movable contact bridge is increased, and the intensity of magnetic fields in the first magnetizer and the second magnetizer is increased, so that the first magnetizer and the second magnetizer are attracted to each other, and the movable contact bridge is prevented from being separated from the static contact assembly.
Preferably, the magnetic circuit assembly further comprises a partition plate and a yoke unit, the coil unit is arranged at one end of the installation cavity, which is far away from the static contact assembly, the partition plate is arranged at one end of the coil unit, which is close to the static contact assembly, the yoke unit, the partition plate and the shell are at least partially coated on the periphery of the coil unit and are positioned on the inner side of the coil unit, an inner magnetic circuit space is formed by the uncoated part, the movable iron core is arranged on the inner side of the coil unit, and when the coil unit is electrified, the movable iron core is driven to move towards the inner magnetic circuit space until the movable iron core is abutted with the partition plate and forms a closed magnetic circuit with the yoke unit, the partition plate and the shell.
Preferably, the movable contact mechanism further comprises a limiting piece, the driving rod penetrates through the partition plate, the movable contact bridge is arranged at one end, close to the static contact assembly, of the driving rod, the first elastic pressing piece is connected with the movable iron core, the limiting piece is fixedly connected to one side, far away from the movable iron core, of the driving rod, and the second elastic pressing piece and the movable contact bridge are limited to move between the shaft shoulder of the driving rod and the limiting piece.
Preferably, the magnetic conduction assembly further comprises a fixing seat, the fixing seat is arranged on one side, away from the coil unit, of the partition plate and is fixed in the mounting cavity, the fixing seat is provided with a mounting hole, and two ends of the first magnetic conductor penetrate through the mounting hole.
Preferably, the direct current relay with improved short circuit resistance further comprises a protective shell, the protective shell comprises an outer cover and a shell, the outer cover is fixedly connected with the shell and surrounds the shell to form a protective cavity, the shell is arranged in the protective cavity, and the outer cover is provided with a second opening matched with the static contact assembly.
Preferably, the shell comprises an inner cover, a first inner shell and a connecting cylinder, wherein the inner cover is fixedly connected with the first inner shell through the connecting cylinder and surrounds to form a mounting cavity, the first magnetizer is clamped between the fixing seat and the shell, the inner cover is provided with a first opening matched with the static contact assembly, and the inner cover is further provided with an inflation inlet communicated with the mounting cavity.
Preferably, the shell comprises a filling body and a second inner shell, one end of the second inner shell is opened, the fixing seat is arranged at the opening of the second inner shell, the filling body is filled between the second inner shell and the fixing seat and the protective shell and used for fixing and sealing the fixing seat and the second inner shell, and the second inner shell and the outer shell are fixedly connected.
Preferably, the second magnetizer is sleeved on the driving rod and is clamped between the movable contact bridge and the second elastic pressing piece.
Preferably, the magnetic conduction assembly further comprises a positioning seat, the positioning seat is provided with a positioning groove, one side, away from the static contact assembly, of the fixing seat forms a positioning table, and the positioning table is matched with the positioning groove to position the positioning seat.
Preferably, the action cavity is offered to fixing base near positioning seat one side, and second bullet casting die, movable contact bridge and locating part all set up in the action cavity, and movable contact bridge is spacing by action cavity inner wall along the actuating lever circumference.
Compared with the prior art, the invention has the beneficial effects that: when the coil unit is electrified, a magnetic field is generated to enable the movable iron core to move towards the internal magnetic circuit space and drive the driving rod to move, the movable contact bridge is driven to move towards the static contact assembly until the movable contact bridge is respectively abutted against the two static contact assemblies, the two static contact assemblies are conducted, when a system loop is in short circuit, the current intensity of the movable contact bridge is far greater than that of a relay in normal operation, the magnetic field intensity generated by the first magnetizer and the second magnetizer is rapidly increased, the second magnetizer generates repulsive force towards the first magnetizer and is greater than that of the second elastic pressing piece and the movable contact bridge, and therefore the movable contact bridge can still be conducted with the static contact assembly even under the short circuit condition.
Drawings
Fig. 1a is a front view of an embodiment 1 of a dc relay embodiment 1 with improved short circuit resistance provided by the present invention;
FIG. 1b is a semi-sectional perspective view of an embodiment 1 of a DC relay with improved short circuit resistance along line A in FIG. 1 a;
FIG. 1c is a half-sectional perspective view of the DC relay embodiment 1 of the present invention along a vertical plane to the half-section in FIG. 1 b;
fig. 1d is a semi-cutaway perspective view of a part of the structure of a dc relay embodiment 1 with improved short circuit resistance provided by the present invention;
fig. 2a is a perspective view of a magnetic circuit assembly and a static contact assembly of an embodiment 1 of a dc relay with improved short circuit resistance provided by the present invention;
FIG. 2b is a cross-sectional view of the magnetic circuit assembly and the static contact assembly of the DC relay embodiment 1 with improved short circuit resistance provided by the present invention;
fig. 2c is a perspective view of a part of the structure of the magnetic circuit assembly of the dc relay embodiment 1 with improved short circuit resistance according to the present invention;
FIG. 2d is a top view of the structure of FIG. 2 c;
fig. 3a is a front view of a moving contact structure and a magnetic conductive assembly of an embodiment 1 of a dc relay with improved short circuit resistance according to the present invention;
FIG. 3B is a cross-sectional view at B in FIG. 3 a;
fig. 4a is a bottom perspective view of the fixing base of the dc relay embodiment 1 with improved short circuit resistance according to the present invention;
fig. 4b is a top perspective view of the fixing base of the dc relay embodiment 1 with improved short circuit resistance according to the present invention;
fig. 5a is a top perspective view of the positioning seat of the dc relay embodiment 1 with improved short circuit resistance provided by the present invention;
fig. 5b is a bottom perspective view of the positioning seat of the dc relay embodiment 1 with improved short circuit resistance provided by the present invention;
fig. 6a is a top view of dc relay embodiment 2 with improved short circuit resistance provided by the present invention;
FIG. 6b is a cross-sectional view at C in FIG. 6 a;
FIG. 6c is a cross-sectional view at D in FIG. 6 a;
FIG. 7a is a cross-sectional view of a portion of the structure of example 2 of a DC relay with improved short circuit resistance, taken along line C in FIG. 6a, in accordance with the present invention;
FIG. 7b is a cross-sectional view of a portion of the structure of example 2 of a DC relay with improved short circuit resistance, taken along line D in FIG. 6a, in accordance with the present invention;
fig. 8a is a front view of a moving contact structure, a magnetic conductive assembly and a moving iron core of an embodiment 2 of a dc relay with improved short circuit resistance according to the present invention;
FIG. 8b is a cross-sectional view at E in FIG. 8 a;
reference numerals: 1-housing, 2-magnetic circuit assembly, 3-moving contact mechanism, 4-static contact assembly, 5-magnetic conduction assembly, 6-inflator, 7-protective housing, 8-pressing ring, 9-permanent magnet, 11-mounting cavity, 12-inner cover, 13-first inner housing, 14-connecting cylinder, 21-coil unit, 22-separator, 23-yoke unit, 24-internal magnetic circuit space, 25-coil control module, 26-moving iron core, 31-driving rod, 32-moving contact bridge, 33-first spring, 34-second spring, 35-stopper, 41-contact cylinder, 42-connector, 51-first magnetic conductor, 52-second magnetic conductor, 53-fixed seat, 54-positioning seat, 71-outer housing, 72-outer cover, 121-first opening, 122-inflation port, 211-wire winding, 212-skeleton, 221-positioning hole, 231-connecting seat, 232-yoke unit, 411-connecting slot, 531-mounting hole, 532-actuating cavity 533-magnetic conductor cavity, 534-positioning table, 2120-positioning slot, 2123-first magnetic conductor, 2123-second magnetic conductor, 2123-outer cover, 121-first opening, 121-second magnetic conductor, and second inner housing, positioning cylinder, and 16-positioning cylinder, and filling 1-inner housing.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1:
referring to fig. 1a, 1b and 1c, the present embodiment provides a dc relay with improved short circuit resistance, which includes a housing 1, a magnetic circuit assembly 2, a movable contact mechanism 3, a static contact assembly 4 and a magnetic conductive assembly 5, wherein:
referring to fig. 2a and 2b, a mounting cavity 11 is formed in the housing 1, a coil unit 21 assembly, a movable contact mechanism 3 and a magnetic conduction assembly 5 are disposed in the mounting cavity 11, a static contact assembly 4 points to the movable contact mechanism 3 in a first direction, the static contact assembly 4 is fixedly connected with the housing 1, one side of the static contact assembly is exposed out of the housing 1, and the other side extends into the mounting cavity 11; specifically, the housing 1 includes an inner cover 12, a first inner cover 13 and a connecting cylinder 14, the inner cover 12 and the first inner cover 13 are fixedly connected by the connecting cylinder 14, the first inner cover 13 is generally made of metal such as iron due to magnetic conduction, the inner cover 12 cannot conduct electricity due to connection with the static contact assembly 4, and is generally made of a material with good insulating property and high temperature resistance such as ceramic due to high temperature generated during operation of the direct current relay, and the direct connection between the first inner cover 13 and the inner cover 12 is difficult to realize due to material problems, so that the connection between the first inner cover 13 and the connecting cylinder 14 made of kovar alloy is adopted. The inner cover 12 is provided with a first opening 121 matched with the static contact assembly 4, the inner cover 12 is also provided with an inflation inlet 122, an inflator 6 is fixedly connected to the inflation inlet 122, and the inflator 6 is used for charging arc extinguishing gas such as nitrogen into the installation cavity 11, and the inflator 6 is sealed after the charging is finished so as to prevent gas leakage in the installation cavity 11. In order to ensure the air tightness of the installation cavity 11, the static contact assembly 4 comprises a contact cylinder 41 and a connector 42, the contact cylinder 41 is matched with the first opening 121 and fixedly connected with the inner cover 12 to seal the installation cavity 11, the contact cylinder 41 is generally welded with the periphery of the first opening 121 to ensure the complete sealing of the installation cavity 11, a connecting slot 411 is formed in one end of the contact cylinder 41, the connector 42 is in interference fit with the connecting slot 411, the contact cylinder 41 and the connector 42 are used for connecting an external circuit and are generally made of copper or alloy thereof, and in addition, in order to facilitate the connection of the external circuit, the connector 42 is generally provided with internal threads.
Referring to fig. 2c and 2d, the magnetic circuit assembly 2 includes a coil unit 21, a separator 22, a yoke unit 23 and a movable iron core 26, the coil unit 21 is disposed at an end of the mounting cavity 11 far from the stationary contact assembly 4, the coil unit 21 is formed by a plurality of turns of wires to form a wire winding 211 wound on a frame 212, the separator 22 is disposed at an end of the coil unit 21 near the stationary contact assembly 4, the yoke unit 23, the separator 22 and the housing 1 are at least partially covered outside the coil unit 21, and an inner magnetic circuit space 24 is formed at an inner side of the coil unit 21 near an end of the stationary contact assembly 4 and an uncoated portion thereof, so the inner magnetic circuit space 24 is a gap between the yoke unit 23 and the separator 22; the yoke unit 23 includes a connecting seat 231 and a magnetic conductive sleeve 232, the connecting seat 231 is sleeved in the skeleton 212 and is abutted against one side of the skeleton 212 far away from the coil winding, and is abutted against the first inner shell 13, the magnetic conductive sleeve 232 is sleeved in the connecting seat 231 and is abutted against the connecting seat 231, so as to be used for magnetic conduction and limit the movable iron core 26 to slide along the magnetic conductive sleeve 232 only. In addition, the magnetic circuit assembly 22 further includes a coil control module 25, the wire winding 211 is divided into an inner coil and an outer coil, the inner coil has a low resistance value and high power for starting the movable iron core 26, the outer coil has a high resistance value and low power for maintaining the movable iron core 26 in a closed state, the coil control module 25 is electrically connected with the inner coil and the outer coil respectively and is electrically connected with an external circuit through wires, the inner coil and the outer coil are immediately conducted to work when the electric circuit is just electrified, and the inner coil is disconnected through the coil control module 25 when the electric circuit is electrified for a period of time of 100-200ms, so that the coil power consumption can be reduced through a control board.
Preferably, the partition 22 is provided with a positioning hole 221, the positioning seat 54 forms a first positioning column 543 near the partition 22, the coil unit 21 forms a second positioning column 2121 near the partition 22, specifically, a second positioning column 2121 is formed on the skeleton 212, and the first positioning column 543 and the second positioning column 2121 are matched with the positioning hole 221 to circumferentially position the partition 22, the coil unit 21 and the positioning seat 54.
Referring to fig. 3a and 3b, the movable contact mechanism 3 includes a driving rod 31, a movable contact bridge 32, a first spring pressing member 33, a second spring pressing member 34 and a limiting member 35, wherein the driving rod 31 penetrates through the partition 22, the movable iron core 26 is disposed inside the coil unit 21 and slidably connected with the magnetic conductive sleeve 232 and fixedly connected with the driving rod 31, specifically, the movable iron core 26 is sleeved on the driving rod 31, one end is clamped on the driving rod 31 by a boss, and the other end is limited by a clamp spring, so that the movable iron core is fixed on the driving rod 31. The movable contact bridge 32 corresponds to the two static contact assemblies 4 along the length direction, the movable contact bridge 32 is arranged at one end of the driving rod 31 close to the static contact assemblies 4, one end of the first spring element 33 is connected with the movable iron core 26, the other end of the first spring element 33 is connected with the partition plate 22 or the magnetic conduction assembly 5, specifically, in the embodiment, the partition plate 22 is provided with a hole, a boss extends out of the positioning element towards the partition plate 22 side, the first spring element 33 is connected with the boss of the positioning element so as to drive the movable iron core 26 to move towards the side far away from the internal magnetic circuit space 24, the limiting element 35 is fixedly connected to the side of the driving rod 31 far away from the movable iron core 26, the second spring element 34 and the movable contact bridge 32 are limited between the shaft shoulder of the driving rod 31 and the limiting element 35 to move, one end of the second spring element 34 is connected with the driving rod 31, and the other end of the second spring element 34 is directly or indirectly connected with the movable contact bridge 32 so as to apply force towards the static contact assembly 4 to drive the movable contact bridge 32 to reversely keep the movable contact bridge 32 on a shaft shoulder of the driving rod 31 along the first direction; the first spring 33 and the second spring 34 are springs, and are disposed coaxially with the driving rod 31. It is easy to understand that the movable contact bridge 32, the first elastic pressing piece 33 and the second elastic pressing piece 34 in the movable contact mechanism 3 can be limited by using snap springs or shaft shoulders of the driving rod 31, and the factors such as assembly feasibility and mechanism precision should be considered for comprehensive evaluation design in the actual production process.
With continued reference to fig. 3a and 3b, the magnetic conductive assembly 5 includes a first magnetic conductive body 51, a second magnetic conductive body 52, and a fixing seat 53, the fixing seat 53 is disposed on a side of the partition 22 away from the coil unit 21 and is fixed in the mounting cavity 11, the first magnetic conductive body 51 and the second magnetic conductive body 52 are in a "C" shape, the first magnetic conductive body 51 is fixedly connected with the fixing seat 53, the second magnetic conductive body 52 is connected with the movable contact bridge 32, and the first magnetic conductive body 51 and the second magnetic conductive body 52 surround the periphery of the movable contact bridge 32, so that when the movable contact bridge 32 is conducted, the first magnetic conductive body 51 and the second magnetic conductive body 52 circumferentially surround the movable contact bridge 32. Specifically, the fixing base 53 is provided with a mounting hole 531, the first magnetizer 51 is clamped between the fixing base 53 and the housing 1, and two ends of the first magnetizer 51 penetrate through the mounting hole 531, and the second magnetizer 52 is sleeved on the driving rod 31 and clamped between the movable contact bridge 32 and the second pressing member 34, so that the second magnetizer 52 moves along with the movable contact bridge 32. The fixed seat 53 is close to the positioning seat 54, one side of which is provided with an action cavity 532, and the second spring element 34, the movable contact bridge 32 and the limiting element 35 are all arranged in the action cavity 532, and the movable contact bridge 32 is limited by the inner wall of the action cavity 532 along the circumferential direction of the driving rod 31.
The direct current relay with improved short circuit resistance further comprises a protective shell 7, wherein the protective shell 7 comprises an outer cover 72 and an outer shell 71, the outer cover 72 is fixedly connected with the outer shell 71 and surrounds to form a protective cavity, the shell 1 is arranged in the protective cavity, and the outer cover 72 is provided with a second opening 721 matched with the static contact assembly 4.
Since the housing 1 has a metal part, which cannot be directly exposed to the outside, and the relay is fixed as a whole, the housing 71 is used to protect the inside of the housing 1, and the housing 71 is generally made of a plastic material.
As a preferred embodiment, the magnetic conduction assembly 5 further includes a positioning seat 54, the positioning seat 54 is provided with a positioning groove 541, a positioning table 534 is formed on a side of the fixing seat 53 away from the stationary contact assembly 4, and the positioning table 534 cooperates with the positioning groove 541 to position the positioning seat 54, so that the positioning table 534 cannot be circular, and is generally rectangular.
As a preferred embodiment, the dc relay with improved short circuit resistance further includes a permanent magnet 9, the fixing base 53 is further provided with two magnet cavities 533, the magnet cavities 533 are disposed on two sides of the action cavity 532, the permanent magnet 9 is disposed in the magnet cavities 533, and the two sides of the positioning base 54 extend outwards to form a stopping portion 542, and the stopping portion 542 abuts against the permanent magnet 9, so as to fix the permanent magnet 9 in the magnet cavity 533.
The arc is generated at the moment when the movable contact bridge 32 is disconnected with the static contact assembly 4, and the permanent magnet 9 acts to form a magnetic field to elongate the arc, so that the arc is more easy to extinguish.
As a preferred embodiment, the dc relay with improved short circuit resistance further includes a pressing ring 8, where the pressing ring 8 is made of rubber and is disposed between the inner cover 12 and the fixing base 53, and the fixing base 53 is pressed and fixed when the inner cover 12 is sealed.
In this embodiment, when the coil unit 21 is energized, a magnetic field is generated to move the movable iron core 26 toward the internal magnetic circuit space 24, and the movable contact bridge 32 is abutted against the two static contact assemblies 4, so that the two static contact assemblies 4 are conducted, the first magnetizer 51 corresponds to the opening of the second magnetizer 52, when the loop of the static contact assemblies 4 is short-circuited, i.e. the external working circuit is short-circuited, the current intensity flowing through the movable contact bridge 32 is greatly increased, the magnetic field intensity in the first magnetizer 51 and the second magnetizer 52 is also greatly increased, so that the first magnetizer 51 and the second magnetizer 52 attract each other, and the second magnetizer 52 pushes the movable contact bridge 32 upwards because the first magnetizer 51 is fixed, so as to inhibit the movable contact bridge 32 from separating from the static contact assemblies 4, and improve the short-circuit resistance of the relay.
Example 2:
referring to fig. 6a, 6b and 6c, embodiment 2 is substantially the same as the embodiment 1, and is not repeated here, except that:
the casing 1 includes a filling body 16 and a second inner casing 15, one end of the second inner casing 15 is opened, a fixing seat 53 is disposed at the opening of the second inner casing 15, and the filling body 16 is filled between the second inner casing 15 and the fixing seat 53 and the protective casing 7, and is used for fixing and sealing the fixing seat 53' and the second inner casing 15, and the specific shape of the filling body 16 is shown in fig. 7a and 7b, and meanwhile, the second inner casing 15 and the outer casing 71 are fixedly connected. The ceramic inner cap 12 is manufactured at a high cost, and the purpose is to replace the ceramic inner cap 12 with the filler 16, which can greatly reduce the manufacturing cost, and at the same time, can eliminate the material problem to connect the inner cap 12 and the connecting cylinder 14 of the first inner housing 13, thereby simplifying the process.
Generally, the filling body 16 may be made of an adhesive with a certain fluidity, such as epoxy resin, and the like, when the assembly is assembled, the assembly in the second inner shell 15 is assembled, then the whole body is put into the outer shell 71', the outer cover 72' is assembled, the edge of the outer cover 72 'and the outer shell 71' have a positioning structure, the static contact assembly 4 'can be circumferentially positioned through the second opening of the outer cover 72', so as to prevent the whole body from rotating after being put into the outer shell 71', then the filling body 16 is injected between the second inner shell 15 and the outer shell 71, after the filling body 16 is solidified, the second inner shell 15 and the fixing seat 53' are sealed, the second inner shell 15 is also fixed in the outer shell 71 'by the filling body 16, and the fixing seat 53' is provided with an inflation port, the inflation tube 6 'is connected with an arc extinguishing gas, the installation cavity 11 is filled with the inflation tube 6' through the inflation tube 6', and then the outer cover 72 is additionally assembled to protect the inflation tube 6'. However, since the packing 16 itself is not as resistant to temperature and sealing as ceramic, its lifetime is inferior to the ceramic relay described above.
Referring to fig. 8a and 8b, the movable contact mechanism 3 in this embodiment is also slightly different from embodiment 1: the driving rod 31 comprises a shaft body 311 and a sleeve 312, when assembled, the movable contact bridge 32, the second magnetizer 52, the second spring pressing piece 34 and the sleeve 312 are sequentially arranged on one side of the shaft body 311, the movable contact bridge 32 is abutted against a shaft shoulder at one end of the shaft body 311 and limited, then the whole body passes through the positioning seat 54, the sleeve 312 is abutted against the positioning seat 54', the first spring pressing piece 33 and the movable iron core 26 are sequentially arranged on the other side of the partition 22', the movable iron core 26 is tightly pressed, the movable iron core 26, the sleeve 312 and the shaft body 311 are tightly abutted along the axial direction, and finally the movable iron core 26 and the shaft body 311 are welded and fixed together, so that the assembly is completed, and as two ends of the sleeve 312 are respectively limited by the shaft shoulder of the shaft body 311 and the movable iron core 26, the sleeve 312 cannot move relative to the shaft body 311, and the sleeve 312 and the shaft body 311 can be regarded as a whole.
In summary, in the dc relay with improved short circuit resistance provided by the present invention, when the coil unit 21 is energized, a magnetic field is generated to move the movable iron core 26 toward the internal magnetic circuit space 24 and drive the driving rod 31 to move, so as to drive the movable contact bridge 32 toward the static contact assembly 4 until the movable contact bridge 32 is respectively abutted against the two static contact assemblies 4, and the two static contact assemblies 4 are conducted, when the system circuit is shorted, the current intensity passing through the movable contact bridge 32 is far greater than the current intensity when the relay normally works, the magnetic field intensity generated by the first magnetizer 51 and the second magnetizer 52 is rapidly increased, and the force generated to the first magnetizer 51 is greater than the repulsive force generated to the second elastic pressing member 34 and the movable contact bridge 32 by the static contact assembly 4, so that the movable contact bridge 32 can still remain conducted with the static contact assembly 4 even under the short circuit condition.
The above embodiments of the present invention do not limit the scope of the present invention. Any other corresponding changes and modifications made in accordance with the technical idea of the present invention shall be included in the scope of the claims of the present invention.
Claims (7)
1. The utility model provides a direct current relay that short circuit resistance promoted which characterized in that, includes casing, magnetic circuit subassembly, movable contact mechanism, static contact subassembly, yoke unit and magnetic conduction subassembly, wherein:
an installation cavity is formed in the shell, the coil unit assembly, the movable contact mechanism and the magnetic conduction assembly are arranged in the installation cavity, and the static contact assembly extends into the installation cavity relative to the movable contact mechanism;
the movable contact mechanism comprises a limiting part, a driving rod, a movable contact bridge, a first spring pressing part and a second spring pressing part, wherein the movable contact bridge is movably connected with the driving rod, the static contact component points to the movable contact bridge in a first direction, one end of the first spring pressing part is fixed in the mounting cavity, the other end of the first spring pressing part drives the driving rod to move in the first direction, one end of the second spring pressing part is connected with the driving rod, and the other end of the second spring pressing part drives the movable contact bridge to be reversely kept in the driving rod along the first direction;
the magnetic circuit assembly comprises a coil unit and a movable iron core, and the driving rod is fixedly connected with the movable iron core;
when the coil unit is electrified, a magnetic field is generated to drive the movable iron core to reversely move along the first direction, the movable contact bridge is made to collide with the two static contact assemblies, the two static contact assemblies are conducted, and when the coil unit is powered off, the first elastic pressing piece drives the driving rod to move along the first direction, and the movable contact bridge is separated from the two static contact assemblies;
the magnetic conduction assembly comprises a positioning seat, a fixed seat, a first magnetic conductor and a second magnetic conductor, wherein the first magnetic conductor is fixed in the mounting cavity, the second magnetic conductor is connected with the movable contact bridge, and the first magnetic conductor and the second magnetic conductor are surrounded on the periphery of the movable contact bridge; the positioning seat is provided with a positioning groove, a positioning table is formed on one side, away from the static contact assembly, of the fixing seat, and the positioning table is matched with the positioning groove to position the positioning seat; the second spring pressing piece, the movable contact bridge and the limiting piece are all arranged in the action cavity, and the movable contact bridge is limited by the inner wall of the action cavity along the circumferential direction of the driving rod;
when a system loop is short-circuited, the intensity of current flowing through the movable contact bridge is increased, and the intensity of magnetic fields in the first magnetizer and the second magnetizer is increased, so that the first magnetizer and the second magnetizer are attracted to each other, and the movable contact bridge is prevented from being separated from the static contact assembly;
the direct current relay with improved short circuit resistance also comprises a protective shell, wherein the protective shell comprises an outer cover and a shell, the outer cover is fixedly connected with the shell and surrounds the shell to form a protective cavity, the shell is arranged in the protective cavity, and the outer cover is provided with a second opening matched with the static contact assembly;
the direct current relay with improved short circuit resistance also comprises a permanent magnet, the fixing seat is further provided with two magnet cavities, the magnet cavities are arranged on two sides of the action cavity, the permanent magnet is arranged in the magnet cavities, the two sides of the positioning seat outwards extend to form a resisting part, and the resisting part is in butt joint with the permanent magnet and is used for fixing the permanent magnet in the magnet cavities.
2. The direct current relay with improved short circuit resistance according to claim 1, wherein the magnetic circuit assembly further comprises a separator, the coil unit is disposed at one end of the mounting cavity away from the static contact assembly, the separator is disposed at one end of the coil unit close to the static contact assembly, the yoke unit, the separator and the housing are at least partially covered on the periphery of the coil unit, located inside the coil unit and not covered on the inner magnetic circuit space, the movable iron core is disposed inside the coil unit, and when the coil unit is energized, the movable iron core is driven to move toward the inner magnetic circuit space until the movable iron core abuts against the separator and forms a closed magnetic circuit with the yoke unit, the separator and the housing.
3. The direct current relay with improved short circuit resistance according to claim 2, wherein the driving rod penetrates through the partition plate, the movable contact bridge is arranged at one end of the driving rod, which is close to the static contact assembly, the first spring element is connected with the movable iron core, the limiting element is fixedly connected to one side, away from the movable iron core, of the driving rod, and the second spring element and the movable contact bridge are limited to move between the shaft shoulder of the driving rod and the limiting element.
4. The direct current relay with improved short circuit resistance according to claim 2, wherein the fixing base is arranged on one side of the partition board away from the coil unit and is fixed in the mounting cavity, the fixing base is provided with a mounting hole, and two ends of the first magnetizer penetrate through the mounting hole.
5. The direct current relay with improved short circuit resistance according to claim 4, wherein the housing comprises an inner cover, a first inner shell and a connecting cylinder, the inner cover and the first inner shell are fixedly connected by the connecting cylinder and are surrounded to form the installation cavity, the first magnetizer is clamped between the fixing seat and the housing, the inner cover is provided with a first opening matched with the static contact assembly, and the inner cover is further provided with an inflation inlet communicated with the installation cavity.
6. The direct current relay with improved short circuit resistance according to claim 4, wherein the housing comprises a filling body and a second inner housing, one end of the second inner housing is opened, the fixing seat is arranged at the opening of the second inner housing, the filling body is filled between the second inner housing and the fixing seat and the protective housing, and the filling body is used for fixing and sealing the fixing seat and the second inner housing, and simultaneously, the second inner housing and the outer housing are fixedly connected.
7. The dc relay with improved short circuit resistance according to claim 1, wherein the second magnetic conductor is sleeved on the driving rod and is clamped between the movable contact bridge and the second pressing member.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011375877.0A CN112542355B (en) | 2020-11-30 | 2020-11-30 | Direct current relay with improved short circuit resistance |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011375877.0A CN112542355B (en) | 2020-11-30 | 2020-11-30 | Direct current relay with improved short circuit resistance |
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| CN112542355A CN112542355A (en) | 2021-03-23 |
| CN112542355B true CN112542355B (en) | 2024-02-23 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117912898A (en) * | 2022-10-12 | 2024-04-19 | 厦门宏发电力电器有限公司 | Relay device |
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|---|---|
| CN112542355A (en) | 2021-03-23 |
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