CN2142604Y - Motor protection switch - Google Patents

Abstract

The utility model discloses a motor protection switch. On the base of the structures of the existing switches, such as a bottom plate, a wire connection pile, a handle, a swinging axle, a tripping device, a moving and a fixed contacts, etc., a knocking mechanism which is composed of a spacing socket, a moving connecting sheet, a spring and a tripping knocking rod is designed, and the tripping purpose is accomplished by mechanical pulling force. The tripping of the knocking mechanism replaces the tripping which is driven by electromagnetic attracting force. When any phase is in phase failure or in short circuit, a fuse is burnt out, and the knocking mechanism prompts the tripping device to trip, and consequently, the moving and the fixed contacts are separated from each other rapidity to cut off the main circuit. Consequently, the purpose of protecting a motor or a three-phase electric device is realized. The utility model has the advantages of simple structure, high reliability, low cost, wide ranges of application. Consequently, the utility model is adapted for the generalization and application in countryside and small enterprises.

Description

Motor protection switch

The utility model relates to the phase failure, the protective switch of the short circuit of a kind of motor open-phase automatic protection switch, particularly three-phase alternating-current motor and three-phase power consumption equipment thereof.

Existing all kinds of protection switch has automatic air-break switch, earth leakage circuit-breaker, thermal relay and all kinds of electronic protectors or the like, all there is not fuse unit, make the crooked principle of sheet deformation promote trip gear to reach the automatic disconnection main circuit and rely on electric current to flow through electromagnetic attraction that lead produces or heating, the defective of this device is: (1) technology acuracy is had relatively high expectations, motive force is limited, be difficult to guarantee the accuracy of threading off, when trip gear has malfunctioning slightly, the phase failure and not cutting off the power supply often when running into motor overload or short circuit, can't cut off main power source, cause defectives such as burning motor and circuit; (2) in the use limitation is arranged, versatility is little, because of the switch specification selects for use requirement strict, must press the watt level apolegamy of motor, can not be used for the less low-power machine of load current as large-scale switch, and small-scale switch can not be used for the bigger motor of power, is failure to actuate or frequent movement otherwise cause, and can't protect motor; (3) must be supporting as electronic protector with contactor, also have complicated control circuit, various electric elements are many, complex structure, price height.Therefore be unsuitable for the economic condition and the technical merit of rural electricity consumption.

Application number is that 87211337.X's the defective of " the simple and easy phase failure protector of fully mechanical " is: the joint of (1) its main fixed contact is that the mechanical pulling force by fusible link guarantees to engage, but the tension spring tension that disconnects master, fixed contact makes this fusible link increase again and is subjected to force intensity, so the pulling force that this fusible link bore is very big, easy deformation, cause main, fixed contact loose contact, the pulling force of its fuse and spring selects for use requirement quite strict; (2) when a phase fusible link fuses, though the contact of another phase also disconnects, also have an energising all the time mutually, easily cause Danger Electric shock risk; (3) this switch is that the moving contact that a phase fusible link is held another phase engages with fixed contact, and interlocking mutually is so its line alignment and structure more complicated is all easily made mistakes in the use.

The purpose of this utility model is to overcome the defective of prior art and provides a kind of simple in structure, cheap, safe and reliable; the motor protecting switch that versatility is big; this switch does not have electronic devices and components; do not need external power supply; in the time of can be to the operation of three-phase alternating-current motor and other three-phase power consumption equipment any phase phase failure takes place or automatic fast shut-off three-phase main power source is carried out in short circuit, protection motor and three-phase power consumption equipment.

The realization of the utility model scheme is promptly improved on common electric machine switch basis, and the various electromagnetic attractions that the mechanical pulling force that has used fuse to hold spring substitutes other promote the purpose that trip gear reaches open phase protection.It is included in wiring pile is housed on the insulating base, three-phase fuse, the brace that connects every phase fuse and moving contact, handle is hinged with the upper bracket that is fixed on the swinging axle, trip gear comprises is fixing the fine motion trip shaft on the release lever, it on upper bracket, is equipped with extension spring by the mutually hinged company's of cranking arm part member hinges on swinging axle and mount holder, fixing quiet, moving contact on base plate and the swinging axle respectively.Its invention main points have been to design the knocking gear of bump release lever, the fixedly copper sheet that is about to original three-phase fuse upper end connection changes the sheet that is dynamically connected of three groups of activities into, this sheet that is dynamically connected can be movable on limit base, be connected with moving contact by flexible conductor, spring and dropout lance are housed on the every group of sheet that is dynamically connected.And handle extended, make its extension rod with continuous one, realize the manual separation when motor normally moves.

This motor protecting switch is compared with known technology; it does not need any electric elements; uncontrolled line; only rely on the mechanical force of fuse and spring to substitute electromagnetic attraction promotion trip gear realization switch protection; therefore not only simple in structure; relevant art requires also lower; so it is with low cost; and because the motive force required power of threading off head and shoulders above; the spring that is dynamically connected on the sheet can ensure that again the contact of fusible link is good; therefore working stability is reliable; the phase failure or the short circuit that take place in the time of can be to the operation of three-phase alternating-current motor and other three-phase power consumption equipment are carried out in time errorless; automatically fast shut-off three-phase main power source and being protected; the fuse that it only needs to change corresponding specification just can be protected all big small machines, is specially adapted to the economic condition and the technical merit of rural electricity consumption.

Description of drawings.

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is the A-A cutaway view of Fig. 1, comprises a kind of embodiment of knocking gear.

Fig. 3 is second kind of embodiment of knocking gear.

Fig. 4 is the third embodiment of knocking gear.

By above-mentioned accompanying drawing embodiment, will be further elaborated below.

The wiring pile (2) of triple line is housed on the insulating base (1) of motor protecting switch (seeing Fig. 1-4); three-phase fuse (13) can be fusible link or fuse link; its lower end is connected decides on the brace (outlet column) (14); the upper end links to each other with knocking gear; this knocking gear comprises mobilizable sheet that is dynamically connected (12) or (25), limit base (11) or (26), spring (10) or (24), dropout lance (9).The sheet that is dynamically connected (12) of the knocking gear of embodiment 1 (seeing Fig. 1-2) angle square shape at limit base (11) but in horizontal sliding, lance (9) is fixed on the place ahead of the sheet that is dynamically connected (12), spring (10) is located between lance (9) and the limit base (11).The sheet that is dynamically connected (12) of the knocking gear of embodiment 2 (Fig. 3) angle square shape at limit base (11) but in horizontal sliding, lance (9) is fixed on the place ahead of the sheet that is dynamically connected (12), spring (24) one ends are connected the sheet that is dynamically connected (12) front end, and the other end is connected on the base plate (1).The sheet that is dynamically connected (25) of the knocking gear of embodiment 3 (Fig. 4) V font is hinged on the fluting limit base (26) and can swings, lance (9) can be the adjutage of sheet (25) of being dynamically connected, spring (24) one ends are connected on the adjutage, and the other end is connected on the base plate (1).

The sheet that is dynamically connected is connected with moving contact (5) on being fixed on swinging axle (21) by flexible conductor (6), and fixed contact (4) is fixed on the base plate (1), and silver contact is adopted in dynamic and static contact, replaces the three-phase plug-in strip and the combined floodgate of former technology.

Swinging axle (21) two supports with the fixing wallboard of base plate (1) on, handle (3) is hinged by handle bracket (22) and the upper bracket (20) that is fixed on the swinging axle (21).Fixing fine motion trip shaft (18) on the release lever of trip gear (16), it is connected on the swinging axle (21) by mutually hinged curved arm rod assembly.

The curved arm rod assembly is by the lower carriage (15) that is fixed on the base plate (1), and mutually hinged with it cranking arm (17), connecting rod (19) are formed, and connecting rod (19) is hinged with upper bracket (20) again.

Extension spring (7) one ends connect swinging axle (21), and an end is connected with mount holder (8), and mount holder (8) is fixed on the base plate (1), and the effect of extension spring (7) is the separation of dynamic and static contact (5), (4).

The extension rod (23) that has continuous one on the handle (3) by extension rod (23) collision release lever (16) carries out manual separation when the motor when realizing normal operation need be shut down midway.Therefore the function of this protection switch has manual combination, manual separation or manually combination, automatic functional characteristics of separating, to satisfy the needs of different operating modes.

When needs during to motor or three-phase power consumption equipment input power supply, manual handle is pushed to, be contained in the straight and upright fine motion trip shaft of mutually hinged curved arm rod assembly on the swinging axle (21) and fasten release lever, make it can not continue to rise and rollback, this moment dynamic and static contact (5), (4) closed (Fig. 2), external three phase mains is connected, and motor or three-phase power consumption equipment are started working.When a certain phase in motor or other three-phase power consumption equipment when phase failure or short circuit exceed the rated current of fuse (13) for some reason; no matter the fuse of that phase disconnects; be dynamically connected sheet (12) or (25) can both drive dropout lance (9) bump release lever (16) under the effect of spring (10) or (24); the curved arm rod assembly is threaded off; affect swinging axle (21) because extension spring (7) effect causes this moment; make dynamic and static contact (5), (4) separation cut external power supply rapidly, play the effect of protection motor or three-phase power consumption equipment.If under the situation that the phase failure or short circuit do not take place, need to cut off main power source, so as long as manual handle (3) makes its extension rod (23) bump release lever (16) can reach the manual separation purpose equally.

Claims (7)

1; a kind of motor protecting switch; wiring pile (2) is housed on the insulating base (1); three-phase fuse (13); the brace that connects every phase fuse (13) and moving contact (5); handle (3) is hinged with the upper bracket (20) that is fixed on the swinging axle (21); fixing fine motion trip shaft (18) on the release lever of trip gear (16); it by mutually hinged curved arm rod member hinges on upper bracket (20); on swinging axle (21) and mount holder (8), extension spring (7) is housed; be fixed with fixed contact (4) on the base plate (1); be fixed with moving contact (5) on the swinging axle (21); it is characterized in that the knocking gear that impels trip gear to thread off comprises that the mobilizable sheet that is dynamically connected (12) or (25) that connect three-phase fuse (13) are connected with limit base (11) or (26) fixed; this sheet that is dynamically connected is connected with moving contact (5) by flexible conductor (6), and spring (10) or (24) and dropout lance (9) are housed on the every group of sheet that is dynamically connected.

2, motor protecting switch as claimed in claim 1; it is characterized in that described curved arm rod assembly is by the lower carriage (15) that is fixed on the base plate (1); mutually hinged with it crank arm (17), connecting rod (19) are formed, and connecting rod (19) is hinged with upper bracket (20) again.

3, motor protecting switch as claimed in claim 1 or 2; it is characterized in that the sheet that is dynamically connected (12) that described knocking gear comprises angle square shape at limit base (11) but in horizontal sliding; lance (9) is fixed on the place ahead of the sheet that is dynamically connected (12), and spring (10) is located between lance (9) and the limit base (11).

4, motor protecting switch as claimed in claim 1 or 2; it is characterized in that the sheet that is dynamically connected (12) that described knocking gear comprises angle square shape at limit base (11) but in horizontal sliding; lance (9) is fixed on the place ahead of the sheet that is dynamically connected (12); spring (24) one ends are connected the sheet that is dynamically connected (12) front end, and the other end is connected on the base plate (1).

5, motor protecting switch as claimed in claim 1 or 2; it is characterized in that described knocking gear comprises that the sheet that is dynamically connected (25) of V font is hinged on fluting limit base (26) and can swing; lance (9) can be the adjutage of this sheet that is dynamically connected (25); spring (24) one ends are connected on the adjutage, and the other end is connected on the base plate (1).

6, motor protecting switch as claimed in claim 1 is characterized in that having on the handle (3) extension rod (23) of continuous one.

7, motor protecting switch as claimed in claim 1 is characterized in that described fuse (13) can be fusible link or fuse link.

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