CN112542355A - Direct current relay with improved short circuit resistance - Google Patents
Direct current relay with improved short circuit resistance Download PDFInfo
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- CN112542355A CN112542355A CN202011375877.0A CN202011375877A CN112542355A CN 112542355 A CN112542355 A CN 112542355A CN 202011375877 A CN202011375877 A CN 202011375877A CN 112542355 A CN112542355 A CN 112542355A
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 39
- 238000003825 pressing Methods 0.000 claims abstract description 36
- 230000003068 static effect Effects 0.000 claims abstract description 30
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- 230000000712 assembly Effects 0.000 claims abstract description 16
- 238000000429 assembly Methods 0.000 claims abstract description 16
- 238000005192 partition Methods 0.000 claims description 22
- 239000004020 conductor Substances 0.000 claims description 19
- 230000001681 protective effect Effects 0.000 claims description 11
- 230000009471 action Effects 0.000 claims description 9
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- 125000006850 spacer group Chemical group 0.000 claims 5
- 238000004804 winding Methods 0.000 description 5
- 239000000919 ceramic Substances 0.000 description 4
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- 238000010891 electric arc Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 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
- 238000007789 sealing Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- -1 iron to make Chemical class 0.000 description 1
- 229910000833 kovar Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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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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Abstract
The invention discloses a direct current relay with improved short circuit resistance, which comprises a shell, a magnetic circuit component, a movable contact mechanism, a static contact component and a magnetic conduction component, 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 move the movable iron core to 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 the improved short-circuit resistance, when a system loop is in a short circuit, the current intensity of the movable contact bridge is far larger 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 force generated by the second magnetizer to the first magnetizer is larger than that of the second elastic pressing piece and the repulsive force resultant force of the static contact component on the movable contact bridge is generated, so that the movable contact bridge can still be conducted with the static contact component even under the condition of short circuit.
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 with the direct-acting magnetic circuit structure in the prior art, the direct current relay is internally driven by a movable contact bridge and a static contact connected with the outside through a magnetic circuit system to realize the switching-on and switching-off functions, when the direct current relay is in 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 static contact can generate electric repulsion force, and the repulsion force can push the movable contact bridge open under the condition of being large enough, so that the abnormal disconnection arcing combustion and even explosion of the relay are caused.
For the direct current relay applied to the electric automobile industry at present, due to the increasing energy of a battery system, the short-circuit resistance of the direct current relay is required to be further improved, and meanwhile, the consideration of the overall dimension and the cost of the switch device is also compatible.
Therefore, a relay with a certain short-circuit resistance is needed.
Disclosure of Invention
The invention aims to overcome the technical defects and provide 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 a 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 of anti short circuit ability promotion, its includes casing, magnetic circuit subassembly, movable contact mechanism, stationary 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, 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 installation 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 powered on, a magnetic field is generated to drive the movable iron core to move reversely 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 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 first magnetizer and a second magnetizer, the first magnetizer is fixed in the installation cavity, the second magnetizer is connected with the movable contact bridge, and the first magnetizer and the second magnetizer surround the movable contact bridge; when the system loop is short-circuited, the current intensity flowing through the movable contact bridge is increased, and the magnetic field intensity in the first magnetizer and the second magnetizer is increased, so that the first magnetizer and the second magnetizer are mutually attracted to inhibit the separation of the movable contact bridge and 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 far away from the static contact assembly, the partition plate is arranged at one end of the coil unit 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, the uncoated part of the yoke unit, the partition plate and the shell forms an internal magnetic circuit space, 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 internal magnetic circuit space until the movable iron core is.
Preferably, the movable contact mechanism further comprises a limiting part, the driving rod penetrates through the partition board, the movable contact bridge is arranged at one end, close to the stationary contact assembly, of the driving rod, the first elastic pressing part is connected with the movable iron core, the limiting part is fixedly connected to one side, far away from the movable iron core, of the driving rod, and the second elastic pressing part and the movable contact bridge are limited to move between a shaft shoulder of the driving rod and the limiting part.
Preferably, the magnetic conducting assembly further comprises a fixing seat, the fixing seat is arranged on one side, away from the coil unit, of the partition plate and 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 that anti short circuit ability promoted still includes the protective housing, and the protective housing includes enclosing cover and shell, and enclosing cover and shell fixed connection form the protection chamber, and the casing setting is in the protection intracavity, and the enclosing cover is seted up with stationary contact subassembly matched with second opening.
Preferably, the casing includes inner cup, first inner shell and connecting cylinder, with connecting cylinder fixed connection between inner cup and first inner shell to enclose and form the installation cavity, first magnetizer presss from both sides and locates between fixing base and casing, and the inner cup is seted up and is touched first opening of subassembly matched with quietly, and the inner cup still sets up the inflation inlet that communicates with the installation cavity.
Preferably, the casing includes obturator and second inner shell, second inner shell one end opening, and the fixing base sets up in second inner shell opening part, and it has the obturator to fill between second inner shell and fixing base and the protective housing for fixed and sealed fixing base and second inner shell, while fixed connection second inner shell and shell.
Preferably, the second magnetizer is sleeved on the driving rod and clamped between the movable contact bridge and the second elastic pressing piece.
Preferably, the magnetic conduction subassembly still includes the positioning seat, and the constant head tank is seted up to the positioning seat, and one side that the stationary contact subassembly was kept away from to the fixing seat forms the location platform, and the location platform cooperates with the constant head tank in order to fix a position the positioning seat.
Preferably, an action cavity is formed in one side, close to the positioning seat, of the fixing seat, the second spring pressing piece, the movable contact bridge and the limiting piece are 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.
Compared with the prior art, the invention has the beneficial effects that: when the coil unit is electrified, a magnetic field is generated to move the movable iron core to the inner magnetic circuit space, the driving rod is driven 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 the current intensity of the relay in normal working at the moment, the magnetic field intensity generated by the first magnetizer and the second magnetizer is sharply increased, the force generated towards the first magnetizer is greater than the repulsive force of the second elastic pressing piece and the movable contact bridge which is subjected to the static contact assembly, and therefore, even if the movable contact bridge is in the short circuit condition, the movable contact bridge can still be conducted with the static contact assembly.
Drawings
FIG. 1a is a front view of embodiment 1 of the DC relay embodiment 1 with improved short circuit resistance provided by the present invention;
FIG. 1b is a perspective view of an embodiment 1 of the DC relay with improved short-circuit resistance of the present invention, taken along a half-section of the line A in FIG. 1 a;
FIG. 1c is a half sectional perspective view of embodiment 1 of the DC relay with improved short circuit resistance according to the present invention, taken perpendicular to the half section in FIG. 1 b;
FIG. 1d is a half-sectional perspective view of a partial structure of embodiment 1 of the DC relay with improved short-circuit resistance according to the present invention;
fig. 2a is a perspective view of a magnetic circuit assembly and a stationary contact assembly of embodiment 1 of the dc relay with improved short-circuit resistance provided by the present invention;
fig. 2b is a cross-sectional view of a magnetic circuit assembly and a stationary contact assembly of embodiment 1 of the dc relay with improved short-circuit resistance provided by the present invention;
fig. 2c is a perspective view of a magnetic circuit assembly of embodiment 1 of the dc relay 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 the moving contact structure and the magnetic conductive component of the DC relay embodiment 1 with improved short circuit resistance provided by the invention;
FIG. 3B is a cross-sectional view at B in FIG. 3 a;
fig. 4a is a bottom perspective view of a fixing base of a dc relay embodiment 1 with improved short-circuit resistance provided by the present invention;
FIG. 4b is a top perspective view of the mounting base of embodiment 1 of the DC relay with improved short-circuit resistance according to the present invention;
fig. 5a is a top perspective view of the positioning socket of embodiment 1 of the dc relay with improved short-circuit resistance provided by the present invention;
fig. 5b is a bottom perspective view of the positioning base of the dc relay embodiment 1 with improved short-circuit resistance provided by the present invention;
FIG. 6a is a top view of embodiment 2 of the DC relay with improved short-circuit resistance provided by the present invention;
FIG. 6b is a cross-sectional view at C of FIG. 6 a;
FIG. 6c is a cross-sectional view taken at D in FIG. 6 a;
fig. 7a is a cross-sectional view of a part of the structure of embodiment 2 of the dc relay with improved short-circuit resistance provided by the present invention, taken along the line C in fig. 6 a;
fig. 7b is a cross-sectional view of the structure of the part of the embodiment 2 of the dc relay with improved short-circuit resistance provided by the present invention, taken along the line D in fig. 6 a;
fig. 8a is a front view of the moving contact structure, the magnetic conductive assembly and the moving iron core of the dc relay embodiment 2 with improved short circuit resistance provided by the present invention;
FIG. 8b is a cross-sectional view at E in FIG. 8 a;
reference numerals: 1-shell, 2-magnetic circuit component, 3-movable contact mechanism, 4-static contact component, 5-magnetic conduction component, 6-inflator pump, 7-protective shell, 8-pressing ring, 9-permanent magnet, 11-installation cavity, 12-inner cover, 13-first inner shell, 14-connecting cylinder, 21-coil unit, 22-clapboard, 23-yoke unit, 24-internal magnetic circuit space, 25-coil control module, 26-movable iron core, 31-driving rod, 32-movable contact bridge, 33-first elastic pressing piece, 34-second elastic pressing piece, 35-limiting piece, 41-contact cylinder, 42-connecting head, 51-first magnetic conductor, 52-second magnetic conductor, 53-fixed seat, 54-positioning seat, 71-outer shell, 72-outer cover, 121-first opening, 122-inflation inlet, 211-wire winding, 212-framework, 221-positioning hole, 231-connecting seat, 232-magnetic conduction sleeve, 411-connecting groove, 531-mounting hole, 532-action cavity, 533-magnet cavity, 534-positioning table, 541-positioning groove, 542-abutting part, 543-first positioning column, 721-second opening, 2121-second positioning column, 15-second inner shell, 16-filling body, 311-shaft body and 312-sleeve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1:
referring to fig. 1a, fig. 1b and fig. 1c, the present embodiment provides a dc relay with improved short-circuit resistance, which includes a housing 1, a magnetic circuit component 2, a moving contact mechanism 3, a stationary contact component 4 and a magnetic conductive component 5, wherein:
referring to fig. 2a and 2b, a mounting cavity 11 is formed in the housing 1, the coil unit 21 assembly, the moving contact mechanism 3 and the magnetic conducting assembly 5 are disposed in the mounting cavity 11, the stationary contact assembly 4 points to the moving contact mechanism 3 in a first direction, the stationary contact assembly 4 is fixedly connected with the housing 1, one side of the stationary contact assembly is exposed out of the housing 1, and the other side of the stationary contact assembly extends into the mounting cavity 11; specifically, casing 1 includes inner cup 12, first inner shell 13 and connecting cylinder 14, with connecting cylinder 14 fixed connection between inner cup 12 and first inner shell 13, first inner shell 13 is owing to need the magnetic conduction, generally adopt metals such as iron to make, inner cup 12 is owing to connect the stationary contact subassembly 4, can not electrically conduct, and because direct current relay during operation can produce high temperature, generally adopt such good, the high material of temperature resistant of insulating properties of pottery to make, because the material problem first inner shell 13 is difficult to realize with inner cup 12 lug connection, consequently adopt connecting cylinder 14 with making of kovar alloy to connect both. The inner cover 12 is provided with a first opening 121 matched with the static contact component 4, the inner cover 12 is further provided with an inflation inlet 122, and the inflation inlet 122 is fixedly connected with an inflator 6 and used for filling arc extinguishing gas, such as nitrogen, into the installation cavity 11, and after the inflation, the inflator 6 is sealed to prevent gas leakage in the installation cavity 11. For guaranteeing the gas tightness of installation cavity 11, stationary contact subassembly 4 includes contact cylinder 41 and connector 42, contact cylinder 41 cooperates with first opening 121 and with inner cup 12 fixed connection and seal installation cavity 11, general contact cylinder 41 welds with first opening 121 week side, guarantee to seal installation cavity 11 completely, connecting groove 411 is seted up to contact cylinder 41 one end, connector 42 and connecting groove 411 interference fit, contact cylinder 41 and connector 42 are used for connecting the external line, generally adopt copper or its alloy to make, in addition, in order to connect the external line, connector 42 generally opens there is the internal thread.
Referring to fig. 2c and 2d, the magnetic circuit assembly 2 includes a coil unit 21, a partition 22, a yoke unit 23 and a movable iron core 26, the coil unit 21 is disposed at an end of the installation cavity 11 away from the stationary contact assembly 4, the coil unit 21 is formed by winding a lead winding 211 formed by multiple turns of lead wires around a frame 212, the partition 22 is disposed at an end of the coil unit 21 close to the stationary contact assembly 4, the yoke unit 23, the partition 22 and the housing 1 are at least partially covered outside the coil unit 21, and an uncoated portion of the yoke unit 23, the partition 22 and the housing 1 located at an end of the inner side of the coil unit 21 close to the stationary contact assembly 4 form an internal magnetic circuit space 24, so the internal magnetic circuit space 24 is a gap between the yoke unit; the yoke unit 23 includes a connection seat 231 and a magnetic sleeve 232, the connection seat 231 is sleeved in the frame 212 and is abutted to one side of the frame 212 far away from the coil winding, and is also abutted to the first inner shell 13, and the magnetic sleeve 232 is sleeved in the connection seat 231 and is abutted to the connection seat 231 for magnetic conduction, and limits the movable iron core 26 to only slide along the magnetic sleeve 232. In addition, the magnetic circuit component 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, the power is high for starting the movable iron core 26, the outer coil has a high resistance value, the power is low for maintaining the movable iron core 26 in a closed state, the coil control module 25 is respectively electrically connected with the inner coil and the outer coil, and is electrically connected with an external circuit through a wire, when the coil is just powered on, the inner coil and the outer coil are both immediately conducted to work, when the coil is powered on for a period of time, generally 100 and 200ms, the inner coil is disconnected through the coil control module 25, and thus, the power consumption of the coil can.
Preferably, the partition 22 is provided with a positioning hole 221, the positioning seat 54 is provided with a first positioning post 543 near the partition 22, and the coil unit 21 is provided with a second positioning post 2121 near the partition 22, specifically, the frame 212 is provided with a second positioning post 2121, and the first positioning post 543 and the second positioning post 2121 are all engaged 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 33, a second spring 34 and a limiting member 35, the driving rod 31 is disposed through the partition 22, the movable iron core 26 is disposed inside the coil unit 21, slidably connected to the magnetic conductive sleeve 232, and fixedly connected to the driving rod 31, specifically, the movable iron core 26 is sleeved on the driving rod 31, one end of the movable iron core is clamped to the driving rod 31 by a boss, and the other end of the movable iron core is limited by a snap spring and fixed to the driving rod 31. The movable contact bridge 32 corresponds to the two stationary 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 stationary contact assemblies 4, one end of the first spring pressing piece 33 is connected with the movable iron core 26, the other end is connected with the partition plate 22 or the magnetic conduction assembly 5, specifically, in the embodiment, the partition board 22 is provided with a hole, a boss extends from the positioning member to the side of the partition board 22, the first spring member 33 is connected with the boss of the positioning member, 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 member 35 is fixedly connected to the side of the driving rod 31 far away from the movable iron core 26, the second spring pressing member 34 and the movable contact bridge 32 are limited to move between the shoulder of the driving rod 31 and the limiting member 35, one end of the second spring pressing member 34 is connected with the driving rod 31, the other end is directly or indirectly connected with the movable contact bridge 32, to apply a force to the moving contact bridge 32 in a direction toward the stationary contact assembly 4, so as to drive the moving contact bridge 32 to be reversely held on a shaft shoulder of the driving rod 31 in the first direction; the first spring pressing member 33 and the second spring pressing member 34 are springs and are disposed coaxially with the drive lever 31. It is easy to understand that the movable contact bridge 32, the first spring pressing part 33 and the second spring pressing part 34 in the movable contact mechanism 3 can be limited by the clamp spring or the shaft shoulder of the driving rod 31, and the factors such as assembly feasibility, mechanism precision and the like are considered in the actual production process to carry out comprehensive evaluation design.
Referring to fig. 3a and fig. 3b, the magnetic conducting assembly 5 includes a first magnetic conductor 51, a second magnetic conductor 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 conductor 51 and the second magnetic conductor 52 are in a "C" shape, the first magnetic conductor 51 is fixedly connected to the fixing seat 53, the second magnetic conductor 52 is connected to the movable contact bridge 32, and the first magnetic conductor 51 and the second magnetic conductor 52 surround the movable contact bridge 32, so that when the movable contact bridge 32 is conducted, the first magnetic conductor 51 and the second magnetic conductor 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 casing 1, 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 elastic pressing member 34, so that the second magnetizer 52 moves along with the movable contact bridge 32. An action cavity 532 is formed in one side, close to the positioning seat 54, of the fixed seat 53, the second spring piece 34, the movable contact bridge 32 and the limiting piece 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.
This anti short circuit ability promoted direct current relay still includes protective housing 7, and protective housing 7 includes enclosing cover 72 and shell 71, and enclosing cover 72 and shell 71 fixed connection just surround and form the protection chamber, and casing 1 sets up in the protection intracavity, and enclosing cover 72 offers the second opening 721 with stationary contact subassembly 4 matched with.
Because the housing 1 has a metal part, it cannot be directly exposed outside, and the relay needs to be fixed as a whole, the housing 71 serves to protect the housing 1 and other parts inside, and the housing 71 is generally made of plastic material.
As a preferred embodiment, the magnetic conducting 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 further has two magnet cavities 533, the magnet cavities 533 are disposed on two sides of the actuating cavity 532, the permanent magnet 9 is disposed in the magnet cavities 533, two sides of the positioning base 54 extend outward to form an abutting portion 542, and the abutting portion 542 abuts against the permanent magnet 9, so as to fix the permanent magnet 9 in the magnet cavities 533.
The electric arc is generated at the moment when the movable contact bridge 32 is disconnected from the static contact component 4, and the permanent magnet 9 has the function of forming a magnetic field to elongate the electric arc, so that the electric arc is easier to extinguish.
As a preferred embodiment, the dc relay with improved short circuit resistance further includes a pressing ring 8, wherein the pressing ring 8 is made of rubber, is disposed between the inner cover 12 and the fixed seat 53, and presses and fixes the fixed seat 53 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 to the internal magnetic circuit space 24, and the movable contact bridge 32 is abutted against the two stationary contact assemblies 4, so that the two stationary contact assemblies 4 are conducted, the openings of the first magnetizer 51 correspond to the openings of the second magnetizer 52, when the circuit of the stationary contact assembly 4 is short-circuited, that is, the external working circuit is short-circuited, the intensity of current flowing through the movable contact bridge 32 is greatly increased, the intensity of magnetic field 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 since the first magnetizer 51 is fixed, the second magnetizer 52 pushes the movable contact bridge 32 upward, so as to inhibit the movable contact bridge 32 from being separated from the stationary contact assembly 4, and improve the short-circuit resistance of the relay.
Example 2:
referring to fig. 6a, fig. 6b and fig. 6c, the embodiment 2 is basically the same as the embodiment 1, and is not repeated here, except that:
the housing 1 includes a filling member 16 and a second inner housing 15, one end of the second inner housing 15 is open, the fixing base 53 is disposed at the opening of the second inner housing 15, the filling member 16 is filled between the second inner housing 15 and the fixing base 53 and the protective housing 7 for fixing and sealing the fixing base 53' and the second inner housing 15, and the specific shape of the filling member 16 refers to fig. 7a and 7b, and the second inner housing 15 and the outer housing 71 are fixedly connected. The ceramic inner cover 12 is manufactured at a high cost, and the purpose of the ceramic inner cover 12 is to replace the filler 16, which greatly reduces the manufacturing cost and simultaneously eliminates the material problem and simplifies the process of connecting the inner cover 12 and the connecting cylinder 14 of the first inner casing 13.
Generally, the filling body 16 can be made of an adhesive having a certain fluidity, such as epoxy resin, and when assembled, after the components in the second inner shell 15 are assembled, the whole is put into the outer shell 71', the outer cover 72' is assembled, due to the positioning structure of the edge of the outer cover 72 'and the shell 71', the static contact component 4 'can be positioned circumferentially through the second opening of the outer cover 72', thereby preventing the whole body from rotating after being put into the outer shell 71', and then injecting the filling body 16 between the second inner shell 15 and the outer shell 71, after the filling body 16 is solidified, the second inner housing 15 and the fixing seat 53 'are sealed, the second inner housing 15 is also fixed in the outer housing 71' by the filling body 16, and the fixed seat 53' is provided with an inflation inlet which is connected with an inflator 6', arc extinguishing gas is filled into the installation cavity 11 through the inflator 6', the inflator 6 'is then closed and a cover for protecting the inflator 6' is attached to the outer cover 72. However, the filler 16 is not as temperature resistant and sealing as ceramic, and thus has a shorter service life than the ceramic relay.
Referring to fig. 8a and 8b, the moving 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, during assembly, the movable contact bridge 32, the second magnetizer 52, the second spring pressing part 34 and the sleeve 312 are sequentially installed from 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 to be limited, then the whole body penetrates through the positioning seat 54, the sleeve 312 is abutted against the positioning seat 54', the first spring pressing part 33 and the movable iron core 26 are sequentially installed at the other side of the partition plate 22', the movable iron core 26 is pressed tightly, the movable iron core 26, the sleeve 312 and the shaft body 311 are tightly abutted along the axial direction, finally the movable iron core 26 and the shaft body 311 are welded and fixed together, and therefore assembly is completed, 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.
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 core 26 to the internal magnetic circuit space 24, and drive the driving rod 31 to move, so as to drive the movable contact bridge 32 to move to the stationary contact assembly 4, until the movable contact bridge 32 and the stationary contact assemblies 4 respectively abut against each other, and the stationary contact assemblies 4 are conducted, when a short circuit occurs in the system loop, the current intensity passing through the movable contact bridge 32 is much greater than the current intensity during normal operation of the relay, the magnetic field intensity generated by the first magnetic conductor 51 and the second magnetic conductor 52 is sharply increased, the force generated to the second magnetic conductor 52 is greater than the resultant force of the repulsive force of the stationary contact assembly 4 applied to the second elastic conductor 34 and the movable contact bridge 32, so that the movable contact bridge 32 can still be conducted with the stationary contact assembly 4 even under the short circuit condition.
The above embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. The utility model provides a direct current relay of anti short circuit ability promotion which characterized in that, includes casing, magnetic circuit subassembly, movable contact mechanism, stationary 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, 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 installation cavity, the other end of the first elastic pressing piece drives the driving rod to move towards 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 powered on, a magnetic field is generated to drive the movable iron core to move reversely along the first direction, the movable contact bridge is enabled to be abutted against the two static contact assemblies, the two static contact assemblies are enabled to be 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 enabled to be separated from the two static contact assemblies;
the magnetic conduction assembly comprises a first magnetizer and a second magnetizer, the first magnetizer is fixed in the installation cavity, the second magnetizer is connected with the movable contact bridge, and the first magnetizer and the second magnetizer surround the movable contact bridge;
when a system loop is short-circuited, the current intensity flowing through the movable contact bridge is increased, and the magnetic field intensity in the first magnetizer and the second magnetizer is increased, so that the first magnetizer and the second magnetizer are mutually attracted to inhibit the movable contact bridge from being separated from the static contact assembly.
2. The direct current relay according to claim 1, wherein the magnetic circuit assembly further comprises a spacer and a yoke unit, the coil unit is disposed at an end of the mounting cavity away from the stationary contact assembly, the spacer is disposed at an end of the coil unit close to the stationary contact assembly, the yoke unit, the spacer and the housing at least partially cover an outer periphery of the coil unit, and an uncoated portion of the yoke unit is located inside the coil unit to form an internal 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 towards the internal magnetic circuit space until the movable iron core abuts against the spacer and forms a closed magnetic circuit with the yoke unit, the spacer and the housing.
3. The direct current relay according to claim 2, wherein the movable contact mechanism further comprises a limiting member, the driving rod is disposed through the partition, the movable contact bridge is disposed at an end of the driving rod close to the stationary contact assembly, the first spring member is connected to the movable iron core, the limiting member is fixedly connected to a side of the driving rod away from the movable iron core, and the second spring member and the movable contact bridge are limited to move between a shoulder of the driving rod and the limiting member.
4. The direct current relay according to claim 2, wherein the magnetic conducting assembly further comprises a fixing seat, the fixing seat is disposed on a side of the partition plate away from the coil unit and 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.
5. The direct current relay with the improved short-circuit resistance of claim 1, further comprising 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 a second opening matched with the static contact assembly is formed in the outer cover.
6. The direct current relay of claim 4, wherein the casing comprises an inner cover, a first inner casing and a connecting cylinder, the inner cover is fixedly connected with the first inner casing through the connecting cylinder and surrounds to form the mounting cavity, the first magnetizer is clamped between the fixing seat and the casing, the inner cover is provided with a first opening matched with the stationary contact assembly, and the inner cover is further provided with an air charging port communicated with the mounting cavity.
7. The direct current relay according to claim 4, wherein the housing includes a filler and a second inner casing, one end of the second inner casing is open, the fixing seat is disposed at the opening of the second inner casing, and the filler is filled between the second inner casing and the fixing seat and the protective casing to fix and seal the fixing seat and the second inner casing and to fixedly connect the second inner casing and the outer casing.
8. The direct current relay according to claim 1, wherein the second magnetic conductor is sleeved on the driving rod and sandwiched between the movable contact bridge and the second biasing member.
9. The direct current relay according to claim 4, wherein the magnetic conductive assembly further comprises a positioning seat, the positioning seat is provided with a positioning groove, a positioning table is formed on a side of the fixing seat away from the stationary contact assembly, and the positioning table and the positioning groove cooperate to position the positioning seat.
10. The direct current relay according to claim 9, wherein an action cavity is formed in a side of the fixing base close to the positioning seat, the second spring pressing member, the movable contact bridge and the limiting member are disposed in the action cavity, and the movable contact bridge is limited by an inner wall of the action cavity along a circumferential direction of the driving rod.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
|---|---|---|---|
| CN202011375877.0A CN112542355B (en) | 2020-11-30 | 2020-11-30 | Direct current relay with improved short circuit resistance |
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| CN112542355A true CN112542355A (en) | 2021-03-23 |
| CN112542355B CN112542355B (en) | 2024-02-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024078455A1 (en) * | 2022-10-12 | 2024-04-18 | 厦门宏发电力电器有限公司 | Relay |
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| Publication number | Publication date |
|---|---|
| CN112542355B (en) | 2024-02-23 |
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