CN203014353U - Motor protection switch structure - Google Patents

Abstract

The utility model discloses a motor protection switch structure, comprising a hollow casing; wherein the hollow casing is provided with a solenoid coil, an iron core group, a start button and four groups of normally open contacts therein; the solenoid coil is sleeved on the iron core group, when the solenoid coil is electrified, the iron core group generates magnetic force to make the four groups of normally open contacts close; three groups in the four groups of normally open contacts are used for connecting a motor with a three-phase power supply; the residual group of normally open contact is connected between any two phases of the three-phase power supply after being connected in series with the solenoid coil, and the start button is connected in parallel with the residual group of normally open contact; a temperature control contact is also connected in series in a circuit in which the residual group of normally open contact is connected in series with the solenoid coil; when the start button is pressed down, the solenoid coil is electrified to make the four groups of normally open contacts close, so that the motor puts into operation; when overload, short circuit or phase loss occurs on the motor, the temperature control contact is open, then the solenoid coil is unelectrified to make the motor quit operation.

Description

A kind of motor protecting switch structure

Technical field

The utility model relates to a kind of construction of switch, relates in particular to a kind of motor protecting switch structure.

Background technology

Motor protecter commonly used is divided into mechanical type and the large class of electronic type two, and mechanical type is mainly to coordinate A.C. contactor as main take thermal relay, because thermal relay need be regulated setting current in use, so operates cumbersomely, and precision is not high; The electronic type susceptibility is high, and is easy to install, but very easily misoperation.

Especially in some nonstandard motor products, because overload, short circuit current that cause for quality causes are all different from qualified motor product, therefore, even it is also invalid in thing that aforementioned supporting motor protecter has been installed, do not have due protective effect.

The utility model content

The utility model provides a kind of motor protecting switch structure for the drawback of prior art.

Motor protecting switch structure described in the utility model comprises a hollow housing, is provided with solenoid, iron core group, start button and four groups of normally opened contacts in described hollow housing;

Wherein, described solenoid is sheathed on iron core group, and when this solenoid was charged, described iron core group produced magnetic force and makes four groups of normally opened contact adhesives;

Three groups of normally opened contacts in described four groups of normally opened contacts are used for motor is connected with the three phase supply power supply; Be connected between any two-phase of three phase supply power supply after remaining one group of normally opened contact and solenoid being connected, and described start button is in parallel with this remaining one group of normally opened contact; Also be in series with the temperature control contact in one group of normally opened contact of described residue and circuit that solenoid is connected;

When described start button was pressed, described solenoid was charged and make four groups of normally opened contact adhesives, and described motor puts into operation;

When overload, short circuit or phase shortage appearred in motor, described temperature control contact disconnected, described solenoid dead electricity and make motor out of service.

In motor protecting switch structure described in the utility model; circuit design by uniqueness; the temperature control contact is entered in series connection in the solenoid loop of controlling that motor connects; make when overload, short circuit or phase shortage appear in motor; the temperature control contact can disconnect; and then solenoid dead electricity and make motor out of service, reach the purpose of protection motor.

Description of drawings

Fig. 1 is the schematic diagram of motor protecting switch structure described in the utility model;

Fig. 2 is the electrical schematic diagram of motor protecting switch described in the utility model.

Embodiment

Below in conjunction with accompanying drawing, the utility model is described in further detail, can implements according to this with reference to the specification word to make those skilled in the art.

As shown in Figure 1, motor protecting switch structure described in the utility model comprises a hollow housing 6, is provided with solenoid 1, iron core group 4, start button 3, temperature control contact 2 in described hollow housing 6, and four groups of normally opened contacts 11,12,13,14.Described solenoid 1 is sheathed on iron core group 4, when this solenoid 1 is charged, described iron core group 4 can produce magnetic force and make four groups of normally opened contacts 11,12,13,14 adhesives, and when solenoid 1 dead electricity, described four groups of normally opened contacts 11,12,13,14 can return to off-state.In the present embodiment not to above-mentioned solenoid 1, iron core group 4, start button 3, temperature control contact 2, and the position of four groups of normally opened contacts 11,12,13,14 in hollow housing 6 made clearly and being limited, in actual production, can arrange flexibly according to the profile of hollow housing.Described temperature control contact 2 is closure state when working, and can disconnect when it is heated.

Below in conjunction with Fig. 2, motor protecting switch structure described in the utility model is described further.

As shown in Figure 2, three groups of normally opened contacts 11 in described four groups of normally opened contacts, 12,13 are used for motor is connected with power line U, V, the W of three phase supply power supply; Be connected in after remaining one group of normally opened contact 14 and solenoid 1 being connected between any two-phase of three phase supply power supply (for example being connected between power line U, V), described start button 3 is in parallel with this remaining one group of normally opened contact 14; Also be in series with temperature control contact 2 in one group of normally opened contact 14 of described residue and circuit that solenoid 1 is connected.

When described start button 3 was pressed, described solenoid 1 was charged and make four groups of normally opened contacts 11,12,13,14 adhesives, and described motor M puts into operation.At this moment, because normally opened contact 14 has been in attracting state, therefore, even start button 3 is released, described solenoid 1 also still can be connected between power line U, V by normally opened contact 14, keeps its electriferous state.As long as when overload, short circuit or phase shortage appear in motor M, described temperature control contact 2 will disconnect, and makes described solenoid 1 dead electricity and cause four groups of normally opened contacts 11,12,13,14 to return to off-state, and described motor M is out of service.

In motor protecting switch structure described in the utility model; circuit design by uniqueness; the temperature control contact is entered in series connection in the solenoid loop of controlling that motor connects; make when overload, short circuit or phase shortage appear in motor; the temperature control contact can disconnect; and then solenoid dead electricity and make motor out of service, reach the purpose of protection motor.

Although embodiment of the present utility model is open as above, but it is not restricted to listed utilization in specification and execution mode, it can be applied to the various fields of the present utility model that are fit to fully, for those skilled in the art, can easily realize other modification, therefore do not deviating under the universal that claim and equivalency range limit, the utility model is not limited to specific details and illustrates here and the legend of describing.

Claims (1)

1. a motor protecting switch structure, comprise a hollow housing, it is characterized in that, is provided with solenoid, iron core group, start button and four groups of normally opened contacts in described hollow housing;

Wherein, described solenoid is sheathed on iron core group, and when this solenoid was charged, described iron core group produced magnetic force and makes four groups of normally opened contact adhesives;

Three groups of normally opened contacts in described four groups of normally opened contacts are used for motor is connected with the three phase supply power supply; Be connected between any two-phase of three phase supply power supply after remaining one group of normally opened contact and solenoid being connected, and described start button is in parallel with this remaining one group of normally opened contact; Also be in series with the temperature control contact in one group of normally opened contact of described residue and circuit that solenoid is connected;

When described start button was pressed, described solenoid was charged and make four groups of normally opened contact adhesives, and described motor puts into operation;

When overload, short circuit or phase shortage appearred in motor, described temperature control contact disconnected, described solenoid dead electricity and make motor out of service.

Images