CN204029710U - A kind of thermal protector for three-phase motor - Google Patents
A kind of thermal protector for three-phase motor Download PDFInfo
- Publication number
- CN204029710U CN204029710U CN201420409603.2U CN201420409603U CN204029710U CN 204029710 U CN204029710 U CN 204029710U CN 201420409603 U CN201420409603 U CN 201420409603U CN 204029710 U CN204029710 U CN 204029710U
- Authority
- CN
- China
- Prior art keywords
- bimetal leaf
- moving contact
- thermal protector
- motor
- moving
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Thermally Actuated Switches (AREA)
- Protection Of Generators And Motors (AREA)
Abstract
The utility model discloses a kind of thermal protector for three-phase motor, comprise housing and bimetal leaf, cavity is offered in the housing, bimetal leaf is arranged on inside cavity, it is characterized in that: bimetal leaf is provided with at least two pairs of moving contacts, between moving contact with bimetal leaf, insulation is connected, be electrically connected between two moving contacts of often pair of moving contact, housing is provided with some fixed contacts coordinated with moving contact, this structure is simple, in the middle of the motor being applicable to star-star connection or delta connection, and the phenomenon of motor rotation blockage phase shortage can not be there is, easy to use, reliable operation.
Description
Technical field:
The utility model relates to a kind of thermal protector for three-phase motor.
Background technology:
The Thermal protection of three phase electric machine generally has four kinds of protection forms:
1) adopt two or three single-phase thermoregulators to seal in the middle of winding, comparatively generally commonly use now.But because thermostat saltus step temperature there are differences in the middle of motor rotation blockage process, have a phase thermostat to continue to disconnect, and another biphase current lasts for reset/saltus step process, show as phase no current all the time in the middle of motor rotation blockage process, two-phase continues break-make cyclic process in addition, cause the three-phase imbalance of power supply, and have a thermostat utterly useless all the time;
2) three-phase star thermostat at zero point is adopted to add in the middle of winding.This is for protect form preferably, but in the middle of the motor that can only be used for star connection, in the middle of the motor that cannot be applied in delta connection;
3) in the middle of winding, only use a single-phase thermoregulator, but do not seal among power supply winding, a thermostat feedback temperature signal is to external control.But this kind of protection form cannot feed back the transient current of motor, need the time because heat distributes, this kind of form can not protect the failure condition of motor under transient high-current, may cause burn-down of electric motor;
4) motor does not use any thermostat, by external control circuit monitor current, such as, adopts chopper switch, but can increase load and development effort like this, cannot be applied to some three phase electric machines without control program.
Summary of the invention:
The purpose of this utility model is to provide a kind of thermal protector for three-phase motor, and this structure is simple, in the middle of the motor being applicable to star-star connection or delta connection, and can not there is the phenomenon of motor rotation blockage phase shortage, easy to use, reliable operation.
The purpose of this utility model is achieved by following technical proposals.
A kind of thermal protector for three-phase motor; comprise housing and bimetal leaf; cavity is offered in the housing; bimetal leaf is arranged on inside cavity; it is characterized in that: bimetal leaf is provided with at least two pairs of moving contacts; between moving contact with bimetal leaf, insulation is connected, and is electrically connected, housing is provided with some fixed contacts coordinated with moving contact between two moving contacts of often pair of moving contact.
Moving contact described above comprises screw and nut, and screw coordinates with nut screwing clamping from the bottom surface of bimetal leaf through after bimetal leaf, and the end face of bimetal leaf is provided with some wires, and a wire is electrically connected two of a pair moving contact moving contacts.
Screw described above, nut and between wire with bimetal leaf insulation be connected, bimetal leaf offers some through holes, the insulating case being provided with " work " font nested inside through hole, screw coordinates with nut screwing clamping after passing the line ear of insulating case and wire termination.
Upper described bimetal leaf is arranged on inside cavity by governor motion, and described governor motion comprises set screw and hexagonal washer.
Upper described housing is provided with bottom, and bottom closes the peristome of cavity.
The quantity of upper described moving contact is 2 right, 4 moving contacts each other 90 degree be fixed on 4 symmetrical flanges of bimetal leaf.
The quantity of upper described moving contact is 3 right, 6 moving contacts each other 60 degree be fixed on 6 symmetrical flanges of bimetal leaf.
The utility model compared with prior art, has following effect:
1) bimetal leaf is provided with at least two pairs of moving contacts, between moving contact with bimetal leaf, insulation is connected, be electrically connected between two moving contacts of often pair of moving contact, housing is provided with some fixed contacts coordinated with moving contact, two fixed contacts coordinated with a pair moving contact access in the middle of a phase winding of motor, when bimetal leaf is heated generation flexure saltus step action, moving contact is made to leave fixed contact, disconnect the motor winding be connected with fixed contact, disconnecting two phase windings according to three phase electric machine just can the feature passed through of safety assurance motor no current, this thermal protector can be applicable in the middle of the motor of star-star connection or delta connection, and the phenomenon of motor rotation blockage phase shortage can not be there is, easy to use, reliable operation,
2) moving contact comprises screw and nut, screw coordinates with nut screwing clamping from the bottom surface of bimetal leaf through after bimetal leaf, and the end face of bimetal leaf is provided with some wires, and a wire is electrically connected two of a pair moving contact moving contacts, structure is simple, easy to connect;
3) on bimetal leaf, some through holes are offered, the insulating case being provided with " work " font nested inside through hole, screw coordinates with nut screwing clamping after passing the line ear of insulating case and wire termination, structure is simple, easy for installation, ensure to be conducted electricity by bimetal leaf between each moving contact, affect the normal work of thermal protector;
4) bimetal leaf is arranged on inside cavity by governor motion, according to the instructions for use of different motor, can be adjusted by the operating temperature of governor motion to bimetal leaf, applied widely;
5) quantity of moving contact is 2 right, and namely the quantity of fixed contact is also 2 right, can in the middle of 2 phase windings access thermal protectors of motor; The quantity of moving contact is 3 right, and namely the quantity of fixed contact is also 3 right, can in the middle of 3 phase windings access thermal protectors of motor, and user can according to individual demand, the structure of adjustment thermal protector.
Accompanying drawing illustrates:
Fig. 1 is the stereogram of thermal protector in embodiment one;
Fig. 2 is the exploded view of thermal protector in embodiment one;
Fig. 3 is the structure cutaway view of thermal protector in embodiment one;
Fig. 4 is the stereogram of bimetal leaf in embodiment one;
Fig. 5 is the exploded view of bimetal leaf in embodiment one;
Fig. 6 is the assembly structure figure of bimetal leaf and moving contact in embodiment one;
Fig. 7 is that in embodiment one, thermal protector is applied to the circuit diagram in the middle of the motor of star-star connection;
Fig. 8 is that in embodiment one, thermal protector is applied to the circuit diagram in the middle of the motor of delta connection;
Fig. 9 is the stereogram of thermal protector in embodiment two;
Figure 10 is that in embodiment two, thermal protector is applied to the circuit diagram in the middle of the motor of delta connection;
Figure 11 is that in embodiment two, thermal protector is applied to the circuit diagram in the middle of the motor of star-star connection.
Embodiment:
Also by reference to the accompanying drawings the utility model is described in further detail below by specific embodiment.
Embodiment one: as shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4, Fig. 5 and Fig. 6; the utility model is a kind of thermal protector for three-phase motor; comprise housing 1 and bimetal leaf 2; cavity 10 is offered within the case 1; by governor motion, bimetal leaf 2 is arranged on inside cavity 10, described governor motion comprises set screw 71 and hexagonal washer 72, can be adjusted by the operating temperature of governor motion to bimetal leaf 2; housing 1 is provided with bottom 8, and bottom 8 closes the peristome of cavity 10.Bimetal leaf 2 is provided with two pairs of moving contacts 3,4 moving contacts 3 each other 90 degree be fixed on 4 symmetrical flanges of bimetal leaf 2, insulate between moving contact 3 with bimetal leaf 2 and be connected, be electrically connected between two moving contacts 3 of often pair of moving contact 3, housing 1 is provided with some fixed contacts 4 coordinated with moving contact 3.Moving contact 3 comprises screw 31 and nut 32, screw 31 coordinates from the bottom surface of bimetal leaf 2 through tightening with nut 32 after bimetal leaf 2, the end face of bimetal leaf 2 is provided with some wires 5, wire 5 two of a pair moving contact 3 moving contacts 3 are electrically connected.Screw 31, nut 32 and insulating between wire 5 with bimetal leaf 2 is connected, bimetal leaf 2 offers some through holes 21, the insulating case 6 being provided with " work " font nested inside through hole 21, tightens with nut 32 after screw 31 passes the line ear 51 of insulating case 6 and wire 5 end and coordinates.
As shown in Figure 7, time in the middle of the motor that thermal protector is applied to star-star connection, two fixed contacts 4 coordinated with a pair moving contact 3 access in the middle of a phase winding of motor, motor has two phase windings and is linked among thermal protector, when bimetal leaf 2 is heated generation flexure saltus step action because of the function of current, makes moving contact 3 leave fixed contact 4, the motor winding be connected with fixed contact 4 can be disconnected, three phase electric machine disconnects two phase windings just can be passed through by safety assurance motor no current, and motor is quit work; When reset temperature lower than bimetal leaf 2 of operating ambient temperature or electric machine casing temperature, bimetal leaf 2 automatically resets, and moving contact 3 and fixed contact 4 is connected, makes motor restart work.
As shown in Figure 8, time in the middle of the motor that thermal protector is applied to delta connection, identical in the middle of the motor that principle and thermal protector are applied to star-star connection, do not repeat them here.
Embodiment two: as shown in Figure 9, with embodiment one difference is: bimetal leaf 2 is provided with three pairs of moving contacts, 3,6 moving contacts 3 each other 60 degree be fixed on 6 symmetrical flanges of bimetal leaf 2.
As shown in Figure 10, time in the middle of the motor that thermal protector is applied to delta connection, two fixed contacts 4 coordinated with a pair moving contact 3 access in the middle of a phase winding of motor, the three-phase windings of motor is linked among thermal protector, when bimetal leaf 2 is heated generation flexure saltus step action because of the function of current, makes moving contact 3 leave fixed contact 4, the motor winding be connected with fixed contact 4 can be disconnected, three phase electric machine disconnects three-phase windings just can be passed through by safety assurance motor no current, and motor is quit work; When reset temperature lower than bimetal leaf 2 of operating ambient temperature or electric machine casing temperature, bimetal leaf 2 automatically resets, and moving contact 3 and fixed contact 4 is connected, makes motor restart work.
As shown in figure 11, time in the middle of the motor that thermal protector is applied to star-star connection, identical in the middle of the motor that principle and thermal protector are applied to star-star connection, do not repeat them here.
Above embodiment is better embodiment of the present invention; but embodiments of the present invention are not limited thereto; other are any do not deviate from Spirit Essence of the present invention and principle under do change, modification, substitute, combine, simplify; be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (7)
1. a thermal protector for three-phase motor; comprise housing (1) and bimetal leaf (2); cavity (10) is offered in the middle of housing (1); bimetal leaf (2) is arranged on cavity (10) the inside; it is characterized in that: bimetal leaf (2) is provided with at least two pairs of moving contacts (3); insulate between moving contact (3) with bimetal leaf (2) and be connected; be electrically connected between two moving contacts (3) of often pair of moving contact (3), housing (1) is provided with some fixed contacts (4) coordinated with moving contact (3).
2. a kind of thermal protector for three-phase motor according to claim 1; it is characterized in that: moving contact (3) comprises screw (31) and nut (32); screw (31) is tightened with nut (32) afterwards through bimetal leaf (2) from the bottom surface of bimetal leaf (2) and is coordinated; the end face of bimetal leaf (2) is provided with some wires (5), and a wire (5) is electrically connected two moving contacts (3) of a pair moving contact (3).
3. a kind of thermal protector for three-phase motor according to claim 2; it is characterized in that: screw (31), nut (32) and insulating between wire (5) with bimetal leaf (2) is connected; bimetal leaf (2) offers some through holes (21); at the nested insulating case (6) being provided with " work " font in through hole (21) the inside, screw (31) is tightened with nut (32) afterwards through the line ear (51) of insulating case (6) and wire (5) end and is coordinated.
4. a kind of thermal protector for three-phase motor according to claim 1 or 2 or 3; it is characterized in that: by governor motion, bimetal leaf (2) is arranged on cavity (10) the inside, described governor motion comprises set screw (71) and hexagonal washer (72).
5. a kind of thermal protector for three-phase motor according to claim 4, is characterized in that: on housing (1), be provided with bottom (8), and bottom (8) closes the peristome of cavity (10).
6. a kind of thermal protector for three-phase motor according to claim 5, is characterized in that: the quantity of moving contact (3) is 2 right, 4 moving contacts (3) each other 90 degree be fixed on 4 symmetrical flanges of bimetal leaf (2).
7. a kind of thermal protector for three-phase motor according to claim 5, is characterized in that: the quantity of moving contact (3) is 3 right, 6 moving contacts (3) each other 60 degree be fixed on 6 symmetrical flanges of bimetal leaf (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420409603.2U CN204029710U (en) | 2014-07-23 | 2014-07-23 | A kind of thermal protector for three-phase motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420409603.2U CN204029710U (en) | 2014-07-23 | 2014-07-23 | A kind of thermal protector for three-phase motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204029710U true CN204029710U (en) | 2014-12-17 |
Family
ID=52069544
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420409603.2U Active CN204029710U (en) | 2014-07-23 | 2014-07-23 | A kind of thermal protector for three-phase motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204029710U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112234774A (en) * | 2020-09-29 | 2021-01-15 | 浙江优力仕机电科技股份有限公司 | Motor protection system |
-
2014
- 2014-07-23 CN CN201420409603.2U patent/CN204029710U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112234774A (en) * | 2020-09-29 | 2021-01-15 | 浙江优力仕机电科技股份有限公司 | Motor protection system |
| CN112234774B (en) * | 2020-09-29 | 2023-06-13 | 浙江优力仕电驱动科技有限公司 | Motor protection system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104412496A (en) | Electric motor with a thermal switch | |
| Chiranthan et al. | Digital Mcb | |
| CN204029710U (en) | A kind of thermal protector for three-phase motor | |
| CN105337252A (en) | Earth leakage protection apparatus having self-checking function | |
| CN207068768U (en) | Static contact component containing zero sequence current mutual inductor | |
| CN107294065A (en) | Compressor phase shortage fast tripping protection device | |
| CN211046742U (en) | Power conversion device | |
| CN2912067Y (en) | Thermal protecting system for dynamo of air compressor | |
| CN203377449U (en) | Duel temperature regulation safety socket | |
| CN207098594U (en) | Compressor phase shortage fast tripping protection device | |
| US10965149B2 (en) | Electrical power restoration system for a circuit assembly and method | |
| CN203827539U (en) | Heating device for sterilization and disinfection device | |
| CN206272204U (en) | Three-phase alternating-current powered power circuit lightning protection structure | |
| JP3218310U (en) | Outlet with insulated heat conducting member | |
| JP2018537824A5 (en) | ||
| CN206685338U (en) | A kind of electrical control excess temperature automatic switch | |
| CN203376659U (en) | Humiture controller | |
| CN204696662U (en) | A kind of phase-lacking protective device of suction pump three phase electric machine | |
| CN204103449U (en) | There is the earth leakage protective device of self-checking function, electrical connection equipment and power consumption equipment | |
| CN103945584A (en) | Heating device for sterilizer | |
| CN104300499B (en) | Single-phase speed regulating motor protects circuit, single-phase speed regulating motor and fan coil | |
| CN202957577U (en) | Multistage temperature protection device for transformer | |
| CN203660509U (en) | Motor control apparatus and switch having same | |
| RU104399U1 (en) | THERMAL SWITCH | |
| CN202888530U (en) | Protection plug of electric water heater |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |