CN201011649Y

CN201011649Y - Three-phase compressor built-in protector

Info

Publication number: CN201011649Y
Application number: CNU200720000076XU
Authority: CN
Inventors: 匡法荣
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-01-08
Filing date: 2007-01-08
Publication date: 2008-01-23
Anticipated expiration: 2017-01-08

Abstract

The utility model relates to a three phase compressor built-in protector, which is provided with an electric conducting cover. The electric conducting cover is connected with a metal shell; a connection point is fixed on the electric conducting cover; two connection devices which extend into the cavity of the metal shell are insulated fixed on the electric conducting cover; the metal shell is internally fixed with a double metal sheet whose two free ends can extend into the metal shell with the two connection devices to be electrically connected. The protector is internally filled with a certain proposional inert gas; the inert gas has high heat conducting performance and arcing performance so as to improve the sensitivity of the protector and lengthen the normal service life of the compressor. The utility model is still characterized in big contacting point capacity, good arcing performance, safe use, and simple and convenient mounting.

Description

Three-phase Compressor Built-in Protector

Technical field

The utility model relates to a kind of compressor protection device, particularly a kind of Three-phase Compressor Built-in Protector.

Background technology

Compressor is the core position of a lot of equipment, its cost is higher, but in use, because motor current is excessive, perhaps coil temperature is too high, and one contacts bad or multiple reason such as phase shortage misphase in the three-phase circuit, bring problem all can for the normal operation of compressor, gently then may cause whole system work undesired, heavy then may burn compressor.This just needs one even several protective device are installed, and protects the safety of compressor.The thermal protector of protection compressor coil is a lot of in the prior art, but when inserting thermal protector in the compressor circuit, have because himself structural reason, assembling is complicated, is difficult for using, the protector that also has is being difficult to automatically reply after the protection automatically.In addition, for three-phase compressor, when circuit generation misphase, during phase shortage, can produce very big electric current in the circuit, at this moment, claimed device can in time start, and guarantees the safety of circuit.The protector of prior art often will be through complicated judgement when identification misphase phase shortage problem, and what have can only protect a certain in the three-phase, needs to install a plurality of protectors and finishes phase shortage fault-phase protection to three-phase circuit.Compressor protector at open circuit in a flash, under the effect of voltage and electric current, the arcing phenomenon can take place in the breakpoint two ends, so protector also should have arc-control device.This arc-control device must have very strong insulating properties and good thermal conductivity.And thermal conductivity and the bad problem of arc extinguishing will appear in the protector that has, and cause circuit not disconnect and thoroughly have an accident.

Summary of the invention

In view of this, it is a kind of simple in structure that main purpose of the present invention is to provide, and can make things convenient for the Three-phase Compressor Built-in Protector of place in circuit and the safe and efficient use of energy.

For achieving the above object, technical scheme of the present invention is achieved in that to have a conductive cap, described conductive cap connects a metal shell, be fixed with a wiring point on the conductive cap, and insulation is fixed with two terminations that stretch into the metal shell inner chamber, the metal shell internal fixation has bimetal leaf, and its free end can stretch into the metal shell partially conductive with two terminations and be connected.Three terminations and external circuit link, and connect the three phase mains of compressor respectively.

Technical scheme of the present invention also comprises: two terminations that stretch into the metal shell inner chamber are fixed on the conductive cap by insulating glass and ceramics, and connect fixed contact by the still that is fixed on the termination; The bimetal leaf free end has two moving contact correspondences to be arranged on the below of fixed contact; And bimetal leaf is connected on the weldering nail sheet by weldering tack welding, and the other end of weldering nail sheet directly is fixed on the metal shell.Conductive cap and metal shell form an airtight structure, and inside is full of inert gas.

It is the element of mechanical energy with thermal power transfer that bimetal leaf is one, and it is welded by the sheet metal of two kinds of different coefficients of expansion, and an end is fixed, and the other end is in free state.When electric current passes through bimetal leaf, be about to thermal energy transfer and give bimetal leaf, its back temperature of being heated raises.Because two kinds of sheet metal coefficient of expansion differences, the elongation of faying face is identical, forces bimetal leaf towards the less lateral bending song of the coefficient of expansion.When temperature descended, bimetal leaf can return to the original form.Can select the metal of the different coefficients of expansion as required, realize the degree of crook that bimetal leaf is different.

Three-phase Compressor Built-in Protector is a kind of device that can recover automatically after the protection automatically three-phase compressor that utilizes that the operation principle of bimetal leaf is made into.When compressor circuit lacks a certain phase time, because electric current can not balance in the three-phase circuit, will produce very big electric current, compressor produces heat thereupon, and bimetal leaf is heated and expands rapidly, and free end and termination disconnection are cut off the electricity supply.When bimetal leaf is cooled to safe working temperature, promptly recover original state, free end auto-closing, but circuit operate as normal.Thereby protector realizes that circuit is lacked any one can play effective protection mutually.Ifs circuit generation misphase, three-phase current equally can not balances, and the electric current in the protector increases, and the bimetal leaf after being heated also can be finished the protection action, are repaired up to the circuit of misphase, and compressor just can work on.When the compressor motor coil temperature reached motor protector break-off signal set point, protector cut off motor circuit, and motor quits work.Coil temperature descends thereupon, when arriving the recovery temperature set point of motor protector, and the protector automatic processing circuit, motor is resumed work; When motor was in the abnormal work state, when the electric current of protector reached the deliberate action electric current, protector can cut off the power supply of motor safely, and protector can be looked its working condition and can cut off or connect circuit and guarantee that motor is in normal operating conditions.

The main principle of protector is can move rapidly after bimetal leaf is heated, and finishes the action of protection, so require just very high for the bimetal leaf thermal conductivity of protector and the thermal conductivity of protector itself and inside.In order better to realize this function, a certain proportion of inert gas is equipped with in protector inside, and this kind gas has higher thermal conductivity and arc extinguishing, thereby has improved the normal useful life of the susceptibility and the growth compressor of protector.

Description of drawings

Fig. 1 is the structural representation of the utility model preferred forms;

Fig. 2 is the conducting rod connection layout;

Fig. 3 is the another side figure of conducting rod connection layout;

Fig. 4 is the connection diagram of protector and compressor.

Embodiment

As shown in Figure 1, conductive cap 1 below connects metal shell 2, is fixed with two binding posts 5,6 on conductive cap 1, all stretches in the inner chamber of metal shell 2, and the insulation system that binding post 5,6 is formed by insulating glass 3 and ceramics 4 is fixed on the conductive cap 1.Binding post 5,6 links with outside two conductor rods 11 respectively, and its part that stretches into metal shell 2 inner chambers connects fixed contact 8 by still 7 conductions.Bimetal leaf 9 is fixed on metal shell 2 bottoms by weldering nail 10 and weldering nail sheet 12.Wherein, weldering nail sheet 12 directly is welded on metal shell 2 bottoms, and weldering nail 10 is welded on bimetal leaf 9 on the nail sheet 12.The two ends of bimetal leaf 9 have moving contact 13 correspondences to be arranged on fixed contact 8 belows.When the compressor operate as normal, fixed contact 8 contacts with moving contact 13.Among Fig. 2, two conducting rods 11 are connected with binding post 5,6 on the conductive cap 1 respectively, and the 3rd conducting rod 11 directly is fixed on the conductive cap 1.Fig. 3 is another side view after connecting.As shown in Figure 4, three conductor rods 11 link to each other with the three-phase circuit output of three-phase compressor respectively.When the compressor non-normal working, along with the temperature rising of electric current increase or compressor coil, bimetal leaf 9 expanded by heating, action rapidly, break contact is cut off the electricity supply.When bimetallic element 9 was cooled to safe working temperature, fixed contact 8 and moving contact 13 auto-closings made circuit recover normal operating conditions, thus compressor are effectively protected.If metal shell 2 forms closed structure with conductive cap 1, then the utility model can also prevent entering of freon and oil effectively, further prolongs the life-span of protector.But also can in airtight housing, fill inert gas to prevent component ageing, and can increase the service life more, charge into the gaseous mixture of oxygen, nitrogen and helium in this example.Can be between contact of the present utility model by reaching the electric current of 100A, arc extinguishing is good, safe in utilization, installation is simple and convenient,

In side circuit,, also can increase the unsafe factor of protector if current in loop is excessive.Weldering nail sheet 12 can be selected for use resistivity to change bigger metal material with the temperature rising and make, and along with electric current in the circuit increases, its temperature raises, and resistance will become greatly, make current in loop diminish, and can play the effect of a flow restricter.Thereby the electric current in can control loop.Weldering nail sheet 12 can be selected different materials and different shapes, to satisfy the needs of the different electric currents of different compressors.

Present embodiment can also be made the change of several aspects, such as: conductive cap 1 can be made shape arbitrarily, to satisfy the variation of different compressor inner spaces; In this example on the conductive cap 1 fixing wiring point adopted conducting rod 11 direct fixedly connected modes, can also adopt binding post, perhaps mode such as screw connection, its effect provides tie point with protector mutually for one in the three-phase circuit exactly; The insulation system that insulating glass 3 and ceramics 4 are formed can substitute with other insulating material; Weldering nail 10 can remove with weldering nail sheet 12, and bimetal leaf 9 directly is fixed on metal shell 2 bottoms; Bimetal leaf 9 also can adopt modes such as screw to be connected with metal shell; Bimetal leaf 9 also can be divided into two, is separately fixed at metal shell 2 inside, and when bimetal leaf 9 was divided into two, weldering nail sheet 12 also can adopt two accordingly, and bimetal leaf 9 better is connected on the metal shell 2; Bimetal leaf 9 is connected with the conduction of termination can adopt arbitrary structures, can be electrically connected on the metal shell by bimetal leaf 9 in protector inside as long as can satisfy quarter-phase circuit.Fixed contact 8 is just realized aforementioned the connection for better with moving contact 13, if do not use the contact, uses sheet metal directly to contact, and also can realize the function of protector.

The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.

Claims

1. Three-phase Compressor Built-in Protector; it is characterized in that: have a conductive cap; described conductive cap connects a metal shell; be fixed with a wiring point on the conductive cap; and insulation is fixed with two terminations that stretch into the metal shell inner chamber; the metal shell internal fixation has bimetal leaf, and two free end can stretch into the metal shell partially conductive with two terminations and be connected.

2. the built-in device that protects of three-phase compressor according to claim 1, it is characterized in that: described conductive cap is tabular.

3. Three-phase Compressor Built-in Protector according to claim 1 is characterized in that: the described termination that stretches into the metal shell inner chamber is fixed with insulating glass and ceramics.

4. Three-phase Compressor Built-in Protector according to claim 1 is characterized in that: described bimetal leaf free end has two moving contacts.

5. Three-phase Compressor Built-in Protector according to claim 1 is characterized in that: described termination stretches into the metal shell part and connects fixed contact by still.

6. Three-phase Compressor Built-in Protector according to claim 1 is characterized in that: described bimetal leaf is connected on the weldering nail sheet by weldering tack welding, and the described weldering nail sheet other end is welded on the metal shell.

7. three-phase according to claim 1 compresses built-in protector, it is characterized in that: described conductive cap and described metal shell form closed structure, and inside is filled with inert gas.