CN2495025Y - Power-off reset overload protector - Google Patents
Power-off reset overload protector Download PDFInfo
- Publication number
- CN2495025Y CN2495025Y CN 01252921 CN01252921U CN2495025Y CN 2495025 Y CN2495025 Y CN 2495025Y CN 01252921 CN01252921 CN 01252921 CN 01252921 U CN01252921 U CN 01252921U CN 2495025 Y CN2495025 Y CN 2495025Y
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- China
- Prior art keywords
- resistance
- contact point
- substrate
- power
- fixed
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Abstract
The utility model provides an overload protector for electricity break and reposition, which belongs to an overload protective device. The utility model overcomes the shortcoming in the prior overload protector that the respond speed is slow, without any electricity break and reposition function. The overload protector for electricity break and reposition comprises a base board, a movable contact point and a static contact point; the base board is a insulated board; the static contact point is fixed on the base board; the movable contact point is arranged on one end of a movable metal piece; another end of the movable metal piece is fixed on the base board; a double metal piece is also fixed on the base board; the outer end of the double metal piece is contacted with the movable metal piece; the upper side face and the below side face of the double metal piece are respectively provided with a heat protective resistance and a sensing resistance; the resistance value of the heat protective resistance is far larger than that of the sensing resistance; the static contact point is connected with the heat protective resistance through a lead. When the overload current happens, the utility model can make the movable contact point separate from the static contact point; the current in the loop is changed to enter the load after passing through the heat protective resistance and the sensing resistance. But the situation can only be repositioned in the break state of the power supply. So the utility model can guarantee the safety for the operator.
Description
Technical field
The utility model belongs to a kind of overload protection arrangement, particularly a kind of protective device to the electric tool current overload.
Background technology
Electric tool the overload phenomenon occurs through regular meeting in daily use.Therefore be necessary to be provided with protector, be damaged to prevent electric tool.Existing overload protective device does not have the power-off restoration function, that is to say that it has only defencive function, in case when electric current is reduced in the rated value, can not reset even power supply does not cut off the power supply yet.Like this, after protector action took place load is suspended, the operator often thought that power supply disconnects in actual use, arbitrarily operation, but load this moment may reset and turn round, and causes danger.Provide a kind of " novel motor phase shortage, overload protective device " as Chinese patent 96245992; it comprises motor start and stop circuit, current detection circuit, current signal protective circuit, voltage signal protective circuit and audible alarm circuit; according to sensed current signal and voltage signal; come the disjunction motor power, realize phase shortage, overload protection.Obviously, this overload protective device can carry out overload protection, but its structure is quite complicated, the product cost height, and the response time is long.Simultaneously,, there is not the power-off restoration function, to the adventurous hidden danger of operator although it can be reported to the police by sound equipment.
Summary of the invention
The purpose of this utility model is in order to solve the present existing the problems referred to above of existing overload protective device, provide a kind of simple in structure, response speed fast and overload protective device with power-off restoration function.
For achieving the above object; the utility model has adopted following technical proposal: this power-off restoration overload protective device comprises substrate; moving contact and fixed contact; substrate is an insulation board; fixed contact is fixed on the substrate; moving contact is positioned at an end of a moving sheet metal; the other end of moving sheet metal is fixed on the substrate; also fixing bimetal leaf on the substrate; the outer end of bimetal leaf contacts with moving sheet metal; the upper side of bimetal leaf is respectively equipped with the heat that contacts with bimetal leaf with downside and keeps resistance and sensing resistor; heat keeps the resistance of the resistance of resistance much larger than sensing resistor, and fixed contact keeps resistance to connect by lead and heat.
Above-mentioned fixed contact is arranged in a conducting bracket, and conducting bracket is a conductor, is fixed on the substrate, and heat keeps resistance to connect with conducting bracket by lead.
The magnet of adhesive mutually is set respectively on above-mentioned conducting bracket and the moving sheet metal.Magnet is set quickens the contact of moving contact and fixed contact or separate, shorten the response time.
During use, the outer end that the sensing resistor in this power-off restoration overload protective device and heat is kept resistance is cascaded as terminals and load and mains switch.Under the load normal condition, moving contact contacts with fixed contact, and electric current is entered by fixed contact and moving contact place, behind bimetal leaf and sensing resistor, forms the loop by load at last.Because therefore the resistance of sensing resistor with respect to the resistance of load does not seldom influence load operation.In case when abnormal conditions appearred in load, the electric current in the circuit can increase severely, can make the sensing resistor heating this moment, cause the bimetal leaf bending.The moving sheet metal of bimetal leaf compressing makes moving contact separate with fixed contact, and current in loop changes by keeping entering in the load behind resistance and the sensing resistor by heat.Because heat keeps the resistance of resistance very big, although therefore circuit turn-on, load can not turned round.On the other hand, keep the electric current of resistance can make heat keep resistance heating, make bimetal leaf keep case of bending, just make moving contact and fixed contact keep released state by heat.And this state only just can reset behind power cut-off, therefore can guarantee operator's safety.
Advantage of the present utility model is:
1, owing to adopt bimetal leaf moving contact to be separated with fixed contact, when being arranged, overload current can effectively protect load with sensing resistor; Simultaneously, heat keeps resistance to make this protector keep the contact separation state, only just can reset when outage, and is therefore simple and reasonable, can guarantee that the operator uses safely.
2, the response time weak point of action takes place in this power-off restoration overload protective device, particularly after on conducting bracket and the moving sheet metal magnet being set, can improve response speed greatly, improves properties of product, has good practical values.
Description of drawings
Fig. 1 is the structural representation of the power-off restoration overload protective device that provides of the utility model.
Fig. 2 is the electrical schematic diagram of the power-off restoration overload protective device that provides of the utility model.
Embodiment
As shown in Figure 1, in the present embodiment, the power-off restoration overload protective device comprises that substrate 1, moving contact 3, fixed contact 2, bimetal leaf 8, heat keep elements such as resistance R 1, sensing resistor R2 and moving sheet metal 6.Substrate 1 is an insulation board, and fixed contact 2 is fixed on the substrate 1 by a conducting bracket 4.One end of moving sheet metal 6 is provided with moving contact 3, and the other end is fixed on the substrate 1.Do not having external force to do the time spent, moving contact 3 these ends of moving sheet metal 6 are upturned, and moving contact 3 is contacted with fixed contact 2.
In the present embodiment, on conducting bracket 4 and the moving sheet metal 6 permanent magnet 5 that attracts each other is housed respectively.Utilize the magnetic of magnet 5, can improve that moving contact 3 separates with fixed contact 2 or closed response speed.
Heat keeps resistance R 1 and sensing resistor R2 can be welded in respectively on the upper side and downside of bimetal leaf 8.In the present embodiment, sensing resistor R2 adopts common resistance wire, and the hot resistance R 1 that keeps adopts PTC heating sheet, with the stability and the shortening response time of improving its heating.Heat keeps resistance R 1 to connect with conducting bracket 4 by lead 7.The two ends that sensing resistor R2 and heat keep resistance R 1 are cascaded as the terminals of this overload protective device and load T and mains switch S2.
The element of this power-off restoration overload protective device and circuit table are shown in the dashed rectangle among Fig. 2.Moving contact 3 separates and the closed switch S 1 that then forms naturally in Fig. 2 circuit with fixed contact 2.This power-off restoration overload protective device and load T and mains switch S2 are cascaded, but can directly be located in the load T during practical application.Mains switch S2 on the circuit is used for the power-off restoration operation of load T.
The utility model can be widely used on the electric tools such as electric impact drill, electric hammer.
Claims (5)
1; a kind of power-off restoration overload protective device; comprise substrate (1); moving contact (3) and fixed contact (2); substrate (1) is an insulation board; it is characterized in that described fixed contact (2) is fixed on the substrate (1); moving contact (3) is positioned at an end of a moving sheet metal (6); the other end of moving sheet metal (6) is fixed on the substrate (1); also fixing bimetal leaf (8) on the substrate (1); the outer end of bimetal leaf (8) contacts with moving sheet metal (6); the upper side of bimetal leaf (8) is respectively equipped with the heat that contacts with bimetal leaf (8) with downside and keeps resistance (R1) and sensing resistor (R2); heat keeps the resistance of the resistance of resistance (R1) much larger than sensing resistor (R2), and fixed contact (2) keeps resistance (R1) to connect by lead (7) and heat.
2, power-off restoration overload protective device according to claim 1; it is characterized in that described fixed contact (2) is arranged in a conducting bracket (4); conducting bracket (4) is a conductor, is fixed on the substrate (1), and heat keeps resistance (R1) to connect with conducting bracket (4) by lead (7).
3, power-off restoration overload protective device according to claim 2 is characterized in that being provided with respectively on described conducting bracket (4) and the moving sheet metal (6) magnet (5) of adhesive mutually.
4,, it is characterized in that between described bimetal leaf (8) is sandwiched in and substrate (1) is connected two blocks of partiting thermal insulation materials (9) according to claim 1,2 or 3 described power-off restoration overload protective devices.
5,, it is characterized in that described sensing resistor (R2) adopts common resistance wire, and heat keeps resistance (R1) to adopt PTC heating sheet according to claim 1,2 or 3 described power-off restoration overload protective devices.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01252921 CN2495025Y (en) | 2001-08-03 | 2001-08-03 | Power-off reset overload protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01252921 CN2495025Y (en) | 2001-08-03 | 2001-08-03 | Power-off reset overload protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2495025Y true CN2495025Y (en) | 2002-06-12 |
Family
ID=33662512
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01252921 Expired - Fee Related CN2495025Y (en) | 2001-08-03 | 2001-08-03 | Power-off reset overload protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2495025Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105889013A (en) * | 2016-04-07 | 2016-08-24 | 浙江海洋学院 | Overload self-outage return oil transmission pump |
-
2001
- 2001-08-03 CN CN 01252921 patent/CN2495025Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105889013A (en) * | 2016-04-07 | 2016-08-24 | 浙江海洋学院 | Overload self-outage return oil transmission pump |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |