CN2076725U

CN2076725U - Patch bay type motor protector

Info

Publication number: CN2076725U
Application number: CN90212027U
Authority: CN
Inventors: 马明清
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-03-15
Filing date: 1990-03-15
Publication date: 1991-05-08

Abstract

The utility model belongs to the technical field of motor technology. A plurality of previous motor protectors are arranged separating from motors with a zero line. Thus, the previous protector has the advantages of inconvenient use, high price and complex structure. The utility model can be arranged in a wire connecting case of the motor, mainly composed of an electromagnet, a slide block, a connecting rod, a double metal pieces temperature switch, etc., wherein, when the motor goes wrong, the electricity can be cut off automatically. The utility model has the advantages of low cost and convenient use.

Description

Patch bay type motor protector

The utility model belongs to the motor technology field.

Damaging in use can appear in motor, and the main cause of its damage has following several: (1) overload operation; (2) overtension or low excessively; (3) phase shortage appears in three phase electric machine; (4) bearing of motor damage etc.; (5) Fraquent start etc.; (6) rotor broken bar.More than several situations all can directly cause the temperature of motor to surpass setting, motor will burn out like this.Prevent that motor from burning out, just must when motor temperature exceeds standard, just cut off the electricity supply.The electric motor protective device volume that uses is big at present, and is installed separately with motor, and protector adjunction zero line.Therefore use extremely inconvenience, the price height, complex structure, power consumption is also wanted in protection itself.Though simultaneously at present it is simple in structure for fuse that uses or thermal relay formula protective device, can not play a protective role effectively.

The purpose of this utility model is the problem that will solve above-mentioned proposition, and the protector that solution is used is at present put and used inconvenience, problems such as price height, and the while also can reach the purpose of protection very effectively.

The structure of chattering type protective device of the present utility model as shown in Figure 1.When normal power-up, binding post (6) (two pairs, another is to being normal open) contacts with copper sheet on the slide block (4) by the spring in the hole, side position (8) and copper sheet etc., can make electric current pass to motor smoothly like this.As break down; electromagnet (1) just work makes connecting rod (2) drive pusher dog (3), and slide block (4) is moved to the left under the effect of spring, and the copper sheet on the slide block (4) just no longer communicates with binding post (6) like this; thereby make the two-phase outage of motor, reach the purpose of protection motor.Whole protecting device pedestal is formed with epoxy resin; Circuits System also is enclosed in the pedestal, and pedestal and motor patch bay equal and opposite in direction have two holes just in time to link to each other with the bolt of attaching coil holder on the motor on the pedestal; protector just replaces original patch bay, and has played the effect of wiring and protector simultaneously.

The starting of electromagnet is to constitute by set of circuits, as shown in Figure 2.When phase shortage or other reason raise the machine operation temperature, bimetal leaf temperature switch (caning be controlled on a certain hotbed) thus energising makes electromagnet startup work, so just can make slide block move outage.Its circuit has two diodes, resistance and bimetallic, and temperature switch and electromagnet are formed, and the bimetal leaf temperature switch is placed in the coil of motor, so as long as when motor temperature one rising, just can work.

Contactless protector of the present utility model as shown in Figure 3.Replaced as structures such as the pedestal in the accompanying drawing 1, slide blocks with two bidirectional triode thyristor SK.As long as two bi-directional thyristor switch are connected on two inlet wires of motor, after work of electromagnet, just drive reverse-blocking tetrode thyristor and make two down circuitry, thus the protection motor.In the accompanying drawing 3, be connected in parallel on respectively in three circuit, can when arbitrary circuit outage of motor or other fault, make work of electromagnet like this, thereby make the bi-directional thyristor switch outage with four 2CP diodes.Bi-directional thyristor switch SK goes up the resistance of R ≈ 220 Ω also in parallel.

The utility model compared with the prior art, and is simple in structure, low price, good reliability.The chattering type protector can be installed in the terminal box of motor easily, and does not need the adjunction zero line.Non-contact type also can be installed in the inside of motor easily, need not increase other annex, and non-contact type no-spark when outage produces, and therefore can be widely used on the fire-proof motor.The utility model is particularly convenient to the mobile operation motor, and has made sample, facts have proved it is feasible.

Accompanying drawing 1 is chattering type junction box structure figure.Wherein 1. electromagnet, 2. connecting rod, 3. pusher dog, 4. slide block, 5. spring, 6. binding post, 7. pedestal, 8. hole, side position.

Accompanying drawing 2 is the chattering type circuit diagram.

Accompanying drawing 3 is the non-contact type circuit diagram.

Embodiment of the present utility model:

As shown in Figure 1, slide block (4) is positioned in the groove in the middle of the pedestal (7), and copper sheet is arranged on the slide block, and copper sheet can be communicated with by spring etc. with binding post on the pedestal (6).When electromagnet (1) was worked, drivening rod (2) and pusher dog (3) made the effect lower slider of slide block (4) at spring, thereby made the motor outage.One side of binding post taps into line, the coil of the direct line motor of another side.Circuit diagram has that two diodes (2CP) are positive and negative to be connected on two circuits as shown in Figure 2; There is the resistance of a 2K diode back, connects double metal temperature switch again, connects electromagnet then, and the resistance of electromagnet is 2K.

Claims

1, a kind of wiring posture motor protecter of forming by pedestal, binding post in the connection box for motor that is installed in; it is characterized in that this protector is made up of electromagnet, connecting rod, pusher dog, slide block, diode, resistance and bimetal leaf temperature switch; diode, resistance and bidirectional metal sheet temperature switch, electromagnet are in series; electromagnet is communicated with two bi-directional thyristor switch; two bi-directional thyristor switch are connected on two inlet wires of motor, and an and di-resistance.

2, protector as claimed in claim 1 is characterized in that this protector pedestal top shoe is to be blocked by connecting rod and pusher dog, and connecting rod is hinged with electromagnet again, is embedded with copper sheet on the slide block, and copper sheet joins by spring, copper sheet and binding post in the hole, side position again; Also being equipped with spring on the slide block may be stuck in the groove of pedestal.

3, as claim 1,3 described protectors, it is characterized in that this protector has double metal temperature switch to be positioned in the motor coil, diode and resistance are arranged before this switch, and directly connect on two inlet wires of motor.

4, as claim 1,3 described protectors, it is characterized in that pedestal is to be made by epoxy resin, size is the same with the motor patch bay, and two holes are arranged on the pedestal, can join with two bolts on the motor wiring shell.