CN202178214U - Auxiliary contact device with double-section protection - Google Patents
Auxiliary contact device with double-section protection Download PDFInfo
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- CN202178214U CN202178214U CN 201120243433 CN201120243433U CN202178214U CN 202178214 U CN202178214 U CN 202178214U CN 201120243433 CN201120243433 CN 201120243433 CN 201120243433 U CN201120243433 U CN 201120243433U CN 202178214 U CN202178214 U CN 202178214U
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- auxiliary contact
- contactor
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- auxiliary
- contact
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Abstract
The utility model discloses an auxiliary contact device with double-section protection. The auxiliary contact device comprises a box body, an auxiliary contact support, at least one pair of normally closed auxiliary contacts and two pairs of normally open auxiliary contacts are arranged in the box body; the auxiliary contact support is used for supporting a movable auxiliary contact; the normally closed contacts are connected with a forced discharging resistor in series; both the two pairs of normally open contacts are connected with damping resistors in series; the damping resistors between the two pairs of normally open contacts are connected in parallel; and the contact separations of the two pairs of normally open contacts are different. In the utility model, the surge peak current in a circuit can be timely and rapidly limited through adding a group of damping resistors, so that the surge peak current suddenly drops to a specified value. The auxiliary contact device with double-section protection is particularly suitable for protecting the main contacts, damping resistors and capacitor groups of contactors from being damaged bythe surge current peaks caused by capacitive loads, inductive loads or capacitive and inductive mixed l loads in circuits or shortening the electrical lives of the main contacts, damping resistors and capacitor groups of contactors.
Description
Technical field
The utility model relates to a kind of auxiliary contact device of contactor, particularly with the auxiliary contact device of the contactor of two segment protects, belongs to the low-voltage electrical apparatus field.
Background technology
Contactor is used at control circuit as big, the wide control apparatus of a kind of amount, remote connect, branchs deenergizing and control motor starting, stop, turning round in the switching, power factor compensation etc. of disjunction, capacitor group; Particularly in having fields of employment such as heating, refrigeration, frequency conversion, electromagnet, lifting; Because of having capacity load, inductive load or capacitive character, inductive mixed load, these equipment can produce bigger 100 times than rated operational current in circuit when operation; Even the surge current of higher multiple; This surge current has great infringement to the main contact of contactor, can reduce its electrical endurance, even burns contactor.
At present; On the world, domestic market; Be the adverse effect of limit inrush currents to main noddle on contactor, the scheme that generally adopts is: on contactor, increase the auxiliary contact group, for avoiding power not normal (the main contact welding of contactor, overheating etc.); Contactor must bear the main contact of the permanent electric current that reaches 1.5 times of capacitor group rated current and contactor of short duration and big peak current when closed; Damping resistance or damping resistance through the auxiliary contact configuration set are associated with the main contact of contactor with the loop of forced electric discharge resistance, realize the restriction to surge current, and then develop switching capacitor contactor.
This type switching capacitor contactor common design is two damping resistances of normally open contact series connection of auxiliary contact group; Normally open contact is connected before the main contact of contactor is connected in advance; In the disjunction again of having no progeny of main contact branch; In several milliseconds, inrush current limitation at below 20 times of rated operational current, has been realized the infringement of limit inrush currents to the main contact of contactor; Improve its electrical endurance: the normally closed interlock group of the auxiliary contact group forced electric discharge resistance of connecting; Have no progeny when the main contact branch of contactor the capacitor group is carried out forced electric discharge, be not more than 50V, avoid the main contact of damping resistance and contactor to damage to guarantee capacitor group its residual voltage when throwing in for the second time.This type is to the main contact realization connection of contactor, the expression of first degree protection of disjunction, and we are referred to as the one-part form protection.
But; There is a defective in this one-part form protection; As: in the low-pressure industrial facility, the capacitor group is mainly used in the compensation (raising power factor) of reactive power, when these capacitor group energisings; Will be during transient process (1ms-2ms) produce significantly the overcurrent of (reach 100 times of rated current, even the electric current of higher multiple) and high-frequency (3kHz-15kHz).The amplitude of this current peak is called " surge peak current ", and its size is main relevant with following factor:
1. network inductance:
2. transformer efficiency and short-circuit voltage:
3. power factor compensation type.
When contactor when connecting the capacitor group; The main contact of contactor, said auxiliary contact group are all in service at the same time; Exist damping resistance in several milliseconds; Can't with inrush current limitation rated operational current below 20 times or directly damping resistance is burnt, the main contact that can not reach the protection contactor is avoided the purpose of surge current injury, in other words; The speed that this one-part form protection sharply descends the surge peak current is not enough, has the hidden danger of scaling loss damping resistance, main noddle on contactor, capacitor group.
The utility model content
In view of above-mentioned background; The purpose of the utility model provides a kind of auxiliary contact device with two segment protects; It can make the surge peak current sharply descend; The main contact, damping resistance, the capacitor group that reach the protection contactor escape injury, and improve the effect of the electrical endurance of contactor, capacitor group, damping resistance.
For achieving the above object, the utility model adopts following technical scheme:
A kind of auxiliary contact device with two segment protects comprises a casing, it is characterized in that:
Hold the auxiliary contact support of supporting moving auxiliary contact in the said casing:
Hold at least one pair of normally closed auxiliary contact and two pairs in the said casing and often open auxiliary contact:
Said normally closed interlock series connection forced electric discharge resistance:
Damping resistance between the said two pairs of equal series damping resistors of normally open contact, the two pairs of normally open contacts is connected in parallel.
Further:
Said auxiliary contact support is driven by the main contact support of contactor.
The clearance between open contacts of said two pairs of normally open contacts is inequality.
When the main contact support of contactor and auxiliary contact are supported in the process of operation simultaneously; There is a difference because of two pairs of clearance between open contacts of often opening auxiliary contact, often opens the position when connection or the disjunction of moving auxiliary contact and quiet auxiliary contact on the auxiliary contact through two pairs twice variation takes place, insert promptly that twice variation takes place the damping resistance value in the loop; Accomplish restriction surge peak current twice; Compare with above-mentioned switching capacitor contactor, increased by a segment protect, so be called the two-period form protection.
The beneficial effect of the utility model is:
Compare with general switching capacitor contactor; This auxiliary contact device is through increasing by one group of damping resistance; Reach contactor connect, disjunction because of circuit in capacity load, inductive load, or capacitive character, inductive mixed load produce bigger surge current the time, can be in time, the surge peak current in the restricting circuits apace; Make the surge peak current sharply drop to setting; Guarantee the operate as normal of contactor, realized the infringement of limit inrush currents, improved the electrical endurance of contactor, capacitor group, damping resistance the main contact of contactor, capacitor group, damping resistance.
Description of drawings
Fig. 1 is the utility model schematic circuit:
Fig. 2 is in the sketch map of initial position for the utility model:
Sketch map when Fig. 3 is first pair of normally open contact group closure of the utility model:
Fig. 4 is the sketch mapes of two pairs of normally open contact groups of the utility model when fully closed.
Embodiment
The utility model provides a kind of auxiliary contact device with two segment protects; It can satisfy contactor at connection, disjunction capacity load, inductive load; Or when capacitive character, inductive mixed load; Be limited in the servicing unit of the surge peak current that produces in the circuit fast; Avoid the injury of surge peak current and reduce its electrical endurance even burn contactor and the situation of capacitor group with the main contact, capacitor group etc. of protection contactor, it can realize combination with contactor easily, constitutes a switching capacitor contactor.
The utility model auxiliary contact device comprises casing, and pedestal, auxiliary contact support, some auxiliary contacts, forced electric discharge resistance, damping resistance, lead are housed in the casing.Every pair of auxiliary contact is made up of moving auxiliary contact and quiet auxiliary contact, and this moving auxiliary contact can be realized connecting and disjunction with quiet auxiliary contact, makes this state to auxiliary contact change.Hold at least one pair of normally closed auxiliary contact and two pairs in the casing of the utility model and often open auxiliary contact, wherein: normally closed interlock series connection forced electric discharge resistance: the damping resistance between two pairs of equal series damping resistors of normally open contact, the two pairs of normally open contacts is connected in parallel.
Said auxiliary contact device can be installed on the contactor (electromagnetic type, magneto, electronic type etc.), so that the auxiliary contact support can be driven by the main contact support of contactor.
When the control loop of contactor is switched on; The main contact support of contactor moves downwards, and the auxiliary contact support is driven operation downwards by the main contact support of contactor, and the auxiliary contact support at first drives normally closed auxiliary contact disjunction; Then; Often open to open in the auxiliary contact for two pairs and connect, insert one group of damping resistance, accomplish the restriction of the surge peak current that the phase I produces contactor in the connection process: after the auxiliary contact support continues downwards the operation certain distance apart from the less auxiliary contact of often opening; Often opening the auxiliary contact of opening in the auxiliary contact apart from bigger of often opening for two pairs connects; Parallel connection inserts another group damping resistance, and accomplish the restriction of the surge peak current that second stage produces in the connection process contactor: after the auxiliary contact support continued to move certain distance downwards again, the main contact of contactor was just connected; So far realized that two pairs are often opened auxiliary contact connection in advance before the main contact of contactor is connected, reached the purpose of the surge peak current that the limited contact device produces in the connection process.
When the control loop of contactor cut off the power supply, the main contact support of contactor is operation upwards, and the auxiliary contact support is driven upwards by the main contact support of contactor and moves; The main contact support of contactor at first drives the main contact disjunction of contactor, then, and after the auxiliary contact support continues upwards to move certain distance; Often open to open in the auxiliary contact for two pairs and often open the disjunction of auxiliary contact elder generation apart from bigger; Break off one group of damping resistance, accomplish the restriction of the surge peak current that the phase I produces contactor in breaking course: after the auxiliary contact support continues upwards to move certain distance again, often open to open in the auxiliary contact for two pairs and often open auxiliary contact disjunction again apart from less; Break off another group damping resistance; Accomplish the restriction of the surge peak current that second stage produces in breaking course contactor, so far having realized two pairs, often to open auxiliary contact disconnected in the main contact branch of the contactor inborn ability of having no progeny, and reaches the purpose of the surge peak current that the limited contact device produces in breaking course: last; After the auxiliary contact support continues upwards to move certain distance again; Normally closed auxiliary contact is connected, and inserts forced electric discharge resistance, realizes the forced electric discharge to the capacitor group; To guarantee that capacitor group its residual voltage when throwing in for the second time is not more than 50V, avoids the main contact of damping resistance and contactor to damage.
Further specify below in conjunction with accompanying drawing and embodiment:
Shown in Figure 1 is the schematic circuit of the utility model auxiliary contact device.
When initial condition; Normally closed auxiliary contact 6 (forming) closure by the moving auxiliary contact 61 of activity, static quiet auxiliary contact 62; The normally closed auxiliary contact 6 that is connected is in on-state; Forced electric discharge resistance 5 is logical with the capacitor winding: at this moment, that often opens auxiliary contact 2 (being made up of moving auxiliary contact 21, quiet auxiliary contact 22) opens distance greater than the distance of opening of often opening auxiliary contact 4 (being made up of the auxiliary contact 41 of living, quiet auxiliary contact 42).
The principle of the utility model is:
When initial condition, auxiliary contact 6 closures, the normally closed auxiliary contact that is connected is in closure state, and forced electric discharge resistance 5 is connected in the circuit, and this opens opening apart from greater than the distance of opening of often opening auxiliary contact group 4 of auxiliary contact group 2 often.
When the control loop of contactor is switched on, support that at the main contact support driving auxiliary contact of contactor the auxiliary contact sequence of movement is: normally closed auxiliary contact 6 at first breaks off in the running; It is closed subsequently often to open auxiliary contact 4; Then, it is closed more often to open auxiliary contact 2, and main contact is closed at last.Closed and often open auxiliary contact 2 when not closed when often opening auxiliary contact 4; Utilize the restriction of the surge peak current that 3 pairs of contactors of damping resistance produce in the connection process in the circuit, this is first segment protect in the contactor connection process, after this; The main contact support drives the auxiliary contact support and continues operation; Drive that often to open auxiliary contact 2 closed subsequently, at this moment, in the circuit except that damping resistance 3 limit inrush currents peak values; Again parallel connection damping resistance 1 restriction surge peak current, this is second segment protect in the contactor connection process.This process has just realized: two often open auxiliary contact 2,4 connection in advance before the main contact of contactor is connected, and reach the purpose of the surge peak current that the limited contact device produces in the connection process.
When the control loop of contactor cuts off the power supply, support that at the main contact support driving auxiliary contact of contactor the main contact of contactor at first breaks off in the running; Then, auxiliary contact 4 breaks off with auxiliary contact 2 successively, has broken off and auxiliary contact 2 when not breaking off at the main contact of contactor; Utilize the restriction of the surge peak current that 1 pair of contactor of damping resistance produces in breaking course in the circuit, this is first segment protect in the contactor breaking course, after this; The main contact support drives the auxiliary contact support and continues operation; Drive and often to open auxiliary contact 4 and break off subsequently, at this moment, in the circuit except that damping resistance 1 limit inrush currents peak value; Again parallel connection damping resistance 3 restriction surge peak currents, this is second segment protect in the contactor breaking course.This process has just realized: it is disconnected in the main contact branch of the contactor inborn ability of having no progeny often to open auxiliary contact 2,4; Reach the purpose of the surge peak current that the limited contact device produces in breaking course: last, after the auxiliary contact support continued to move certain distance again, normally closed auxiliary contact 6 was connected; Insert forced electric discharge resistance 5; Realization is not more than 50V to the forced electric discharge of capacitor group to guarantee capacitor group its residual voltage when throwing in for the second time, avoids the main contact of damping resistance 1,3 and contactor to damage.
Shown in Figure 2 is the sketch map that the utility model auxiliary contact device is in initial position.
Lead A connects the 1L1 end of contactor, and lead B connects the 4T2 end of contactor, and lead C connects the 2T1 end of contactor; Movable auxiliary contact 21,41,61 is installed on auxiliary contact and supports on 7; Static auxiliary contact 22,42,62 is installed on the pedestal 8, under this state, and the damping resistance 1 of A end and C end; Through 2 controls of auxiliary contact group; Damping resistance 3 is through 4 controls of auxiliary contact group, wherein often opens the opening apart from H1 greater than the opening apart from the forced electric discharge resistance 5 of H2:B end and C end of auxiliary contact group 4 of auxiliary contact group 2, controls through auxiliary contact group 6.
Shown in Figure 3 is the sketch map of the first pair of normally open contact of the utility model auxiliary contact device when closed.
Often opening auxiliary contact 4 closed processes for first pair is: auxiliary contact supports 7 by the main contact support of contactor driving operation downwards; Auxiliary contact support 7 at first drives normally closed auxiliary contact 6 disjunctions; Then; Often open auxiliary contact 4 and connect, insert one group of damping resistance 3, accomplish the restriction of phase I the surge peak current.
Shown in Figure 4 is two pairs of normally open contacts of the utility model auxiliary contact device sketch mapes when fully closed.
When the control loop of contactor was switched on, the main contact support of contactor moved downwards, and auxiliary contact supports 7 by the main contact support of contactor driving operation downwards; Auxiliary contact support 7 at first drives normally closed auxiliary contact 6 disjunctions; Then, often open auxiliary contact 4 and connect, insert one group of damping resistance 3; Accomplish the restriction of the surge peak current that the phase I produces contactor in the connection process: after auxiliary contact supports 7 to continue downwards the operation certain distance; Often open auxiliary contact 2 and connect, insert another group damping resistance 1, accomplish the restriction of the surge peak current that second stage produces contactor in the connection process: after auxiliary contact supports 7 to continue downwards the operation certain distance again; The main contact of contactor is just connected; At this moment, just realized that two pairs are often opened auxiliary contact 2,4 connection in advance before the main contact of contactor is connected, reached the purpose of the surge peak current that the limited contact device produces in the connection process.
During the outage of contactor control loop, the sequence of movement of contact is:
When the control loop of contactor cut off the power supply, the main contact support of contactor is operation upwards, and auxiliary contact support 7 is driven the operation that makes progress by the main contact support of contactor; The main contact support of contactor at first drives the main contact disjunction of contactor, then, and after auxiliary contact support 7 continues upwards to move certain distance; Often open auxiliary contact 2 disjunctions, break off one group of damping resistance 1, accomplish the restriction of the surge peak current that the phase I produces contactor in breaking course: after auxiliary contact support 7 continues upwards to move certain distance again; Often open auxiliary contact 4 disjunctions; Break off another group damping resistance 3, accomplish the restriction of the surge peak current that second stage produces contactor in breaking course, at this moment; It is disconnected in the main contact branch of the contactor inborn ability of having no progeny just to have realized often opening auxiliary contact 2,4; Reach the purpose of the surge peak current that the limited contact device produces in breaking course: last, after auxiliary contact support 7 continues upwards to move certain distance again, normally closed auxiliary contact 6 connections; Insert forced electric discharge resistance 5; Realization is not more than 50V to the forced electric discharge of capacitor group to guarantee capacitor group its residual voltage when throwing in for the second time, avoids the main contact of damping resistance 1,3 and contactor to damage.
In other embodiment of the utility model:
Often opening auxiliary contact for two pairs can also process out apart from H1 less than H2, as long as the two is opened apart from certain difference (promptly not being 0) is arranged.
Often opening the damping resistance of auxiliary contact series connection and the forced electric discharge resistance of normally closed auxiliary contact series connection can be one or two for every pair, also can be a plurality of, and resistance is then chosen as required.
The above embodiments do not constitute any type of restriction to the desired protection range of the utility model; Claims of the utility model have covered all modifications and change; Therefore, making various modifications to the foregoing description all belongs in the protection range of the utility model with changing.
Claims (3)
1. the auxiliary contact device with two segment protects comprises a casing, it is characterized in that:
Hold the auxiliary contact support of supporting moving auxiliary contact in the said casing:
Hold at least one pair of normally closed auxiliary contact and two pairs in the said casing and often open auxiliary contact:
Said normally closed interlock series connection forced electric discharge resistance:
Damping resistance between the said two pairs of equal series damping resistors of normally open contact, the two pairs of normally open contacts is connected in parallel.
2. the auxiliary contact device with two segment protects as claimed in claim 1 is characterized in that:
Said auxiliary contact support is driven by the main contact support of contactor.
3. the auxiliary contact device with two segment protects as claimed in claim 1 is characterized in that:
The clearance between open contacts of said two pairs of normally open contacts is inequality.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120243433 CN202178214U (en) | 2011-07-11 | 2011-07-11 | Auxiliary contact device with double-section protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120243433 CN202178214U (en) | 2011-07-11 | 2011-07-11 | Auxiliary contact device with double-section protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202178214U true CN202178214U (en) | 2012-03-28 |
Family
ID=45868082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120243433 Expired - Lifetime CN202178214U (en) | 2011-07-11 | 2011-07-11 | Auxiliary contact device with double-section protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202178214U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102881517A (en) * | 2011-07-11 | 2013-01-16 | 北京人民电器厂有限公司 | Auxiliary contact device with two-station protection |
| CN104576122A (en) * | 2013-10-28 | 2015-04-29 | 格奥尔格·埃姆肯 | micro switch |
-
2011
- 2011-07-11 CN CN 201120243433 patent/CN202178214U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102881517A (en) * | 2011-07-11 | 2013-01-16 | 北京人民电器厂有限公司 | Auxiliary contact device with two-station protection |
| CN104576122A (en) * | 2013-10-28 | 2015-04-29 | 格奥尔格·埃姆肯 | micro switch |
| CN104576122B (en) * | 2013-10-28 | 2018-09-25 | 格奥尔格·埃姆肯 | micro switch |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120328 |
|
| CX01 | Expiry of patent term |