CN2722484Y

CN2722484Y - Phase-off and phase sequence protector of three-phase motor for air conditioner compressor

Info

Publication number: CN2722484Y
Application number: CN 200420071105
Authority: CN
Inventors: 李永强
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-06-29
Filing date: 2004-06-29
Publication date: 2005-08-31
Anticipated expiration: 2014-06-29

Abstract

Disclosed is a phase-off and phase sequence protector of a three-phase motor for an air conditioner compressor, belonging to the technical field of three-phase motor protection. The utility model solves the technical problems of ensuring to detect whether the electricity of the input terminal of the three-phase motor is phase-off or is changed in a phase sequence for sending out an operation signal of power-off, and meanwhile integrating a phase-off protector and a phase sequence protector to simplify mounting. Therefore, the outer housing of a protector is provided with a phase-off testing circuit of three-phase power source, a phase sequence testing circuit of the three-phase power source and a controlled silicon operating circuit; the input terminal of the phase-off testing circuit is connected with the input terminal of a motor, the input terminal of the phase sequence testing circuit is connected with two ends and the earth end of the input terminal of the motor, and the output terminals of the phase-off testing circuit and the phase sequence testing circuit are respectively connected with a trigger electrode of one-way controlled silicon through a diode. The phase-off and the phase sequence of the input terminal of the motor are protected by controlled silicon which controls a relay and an AC contactor. The utility model is suitable for all three-phase motors which ensure a constant direction of rotation and prevent a phase-off three-phase motor, in particular to an air conditioner compressor.

Description

Threephase motor phase shortage and phase sequence relay that compressor of air conditioner is used

Technical field

The utility model relates to threephase motor resist technology field, threephase motor phase shortage and phase sequence relay that particularly a kind of compressor of air conditioner is used.

Background technology

Open phase protector that existing threephase motor is used or phase sequence relay all are electrically connected on the main contact upper end of threephase motor major loop; but not motor input terminals; when power supply incoming call phase shortage or phase sequence change the threephase motor that is powered is burnt or reverse, damage equipment also causes security incident.In general; threephase motor major loop main contact is a frequent movement, and the time has been grown the silver alloy contact serious galvanic corrosion of meeting of main contact even come off, and causes a certain phase to be in open-circuit condition all the time; the connection of existing phase shortage or phase sequence relay is but felt simply helpless to this kind situation, has no reaction.

For the vortex compressor of air conditioner,, make 1, one of price fixing for one and make Moving plate 2, as shown in Figure 1 because of its compression, exhaust structure are to adopt two identical spiral of Archimedes type dishes.

Because spiral of Archimedes is in abducent line style, so, when Moving plate 2 rotations, with price fixing 1 motion is radially arranged, thereby Freon gas is compressed.Thus, the phase sequence of three phase supply there is requirement, must guarantees that exactly Moving plate 2 has unique direction of rotation.If the three phase supply phase sequence changes and cause Moving plate 2 to change direction of rotation, gently then to inhale, discharge directions changes, air conditioner can't operate as normal; Heavy then with Moving plate 2 damages, thus cause compressor of air conditioner to damage.

The threephase motor protector that existing compressor of air conditioner is used; be that three-phase voltage with A.C. contactor main contact upper end (R, S, T) is a detection signal; during work; under the power supply normal condition; the lack detection circuit of protector or circuit of testing the phase sequence energising work, miniature relay is in the energising operating state always.The main contacts of the A.C. contactor of and control threephase motor normal when power supply damages when causing phase shortage; then can't detect the power supply phase shortage of this threephase motor input and make the protection action, thereby cause the threephase motor of compressor of air conditioner to burn because of phase shortage.

Summary of the invention

The incoming call that the technical problems to be solved in the utility model is to guarantee to detect the threephase motor input whether phase shortage or phase sequence changes, thereby sends major loop outage actuating signal; Phase shortage, phase sequence circuit to be united two into one simultaneously, to simplify circuit structure and mounting structure.

The technical solution that the utility model proposed is such: threephase motor phase shortage and phase sequence relay that a kind of compressor of air conditioner is used, comprise protector outer casing and dress printed substrate within it, this printed substrate is equipped with three phase mains lack detection circuit and circuit of testing the phase sequence, threephase motor D input R ', S ', T ' is by the main contact Km1 of A.C. contactor Km, Km2, Km3 and three phase supply power supply R, S, T is connected, described power supply phase shortage and phase sequence relay also are provided with the controllable silicon operating circuit, and the unidirectional controllable silicon S CR of this circuit connects with the relay J coil and inserts in its DC operation stabilized voltage power supply; Described power supply lack detection circuit input is connected with threephase motor D input R ', S ', T ', and its output is connected with unidirectional controllable silicon S CR trigger electrode G by diode D3; Described power phase testing circuit input is connected with Ren Erduan and the ground end of threephase motor D input R ', S ', T ', and its output is connected with unidirectional controllable silicon S CR trigger electrode G by diode D2; Insert in the 220V AC power that is provided by three phase supply power supply R, the arbitrary phase and ground end of S, T N after described relay J normally closed interlock J1 connects with A.C. contactor Km coil, described controllable silicon SCR DC operation stabilized voltage power supply input also inserts in this 220V AC power.In the described power phase testing circuit, capacitor C 4, resistance R 4 series connection backs one end are connected with threephase motor D input T ', the other end is connected with node a, resistance R 5 is connected between threephase motor D input S ' and the node a, be connected to after resistance R 3, capacitor C 3 parallel connections between node a and the ground end N, described node a is connected with diode D2 anode.In the described power supply lack detection circuit, resistance R 6, R7, R8 one end are connected among the node b, its other end is connected to three input T ', S ', the R ' of threephase motor D respectively, and described node b is connected with diode D3 anode, is connected to capacitor C 5 between node b and ground end N.In the described controllable silicon DC operation stabilized voltage power supply, resistance R 2, capacitor C 1 back in parallel one end are connected with resistance R 1, the other end is connected with diode D1 anode, diode D1 negative electrode is connected with node E, resistance R 1 other end inserts in the described 220V AC power, voltage stabilizing didoe DW is connected with node E with capacitor C 2 backs in parallel one end, and the other end is connected with ground end N.The components and parts of above-mentioned each circuit all are welded on the printed substrate and are contained in the protector outer casing, can adopt epoxy encapsulation.

Compared with prior art, the utlity model has following beneficial effect:

(1) the threephase motor phase shortage used of the compressor of air conditioner of mainly forming and phase sequence relay by threephase motor lack detection circuit, circuit of testing the phase sequence and controllable silicon operating circuit owing to phase shortage, two combine into one for circuit of testing the phase sequence, thereby circuit structure is simplified, is assembled and the on-the-spot easy-to-connect of installing; The signal input part of above-mentioned phase shortage and phase sequence relay is connected to tested threephase motor input R ', S ', T ' respectively; in this case; even occur certain main contacts scaling loss among the three-phase main contact Km1 of threephase motor main circuit power supply, Km2, the Km3 or come off and cause this phase short of electricity; can both react and make the outage action moment; guarantee that this threephase motor quits work; the compressor of air conditioner that is dragged by it also quits work simultaneously, has protected compressor of air conditioner to exempt from damage reliably.As open-phase fault takes place in three-phase main contact front, this protector plays too to the threephase motor open-phase protection.

(2) under the normal power supply state; the unidirectional controllable silicon S CR of controllable silicon operating circuit and miniature relay J coil are in non-power status; have only when threephase motor input generation phase shortage or phase sequence change; unidirectional controllable silicon S CR is triggering and conducting; the work of just switching on of miniature relay J coil; A.C. contactor Km coil blackout immediately; three-phase main contact Km1; Km2; Km3 disconnects; cut off three phase mains; unidirectional controllable silicon S CR and miniature circuit breaker J coil are in non-power status again; thereby controllable silicon SCR; particularly the working life of miniature relay J prolongs greatly, and the circuit reliability and the fail safe of protector are greatly improved.

The utility model is specially adapted to need to guarantee that its direction of rotation is constant and prevents from also to be applicable to other threephase motors of this requirement simultaneously in the threephase motor of air-conditioning scroll compressor of phase shortage.

Description of drawings

Fig. 1 is the mounting structure schematic diagram of two identical spiral of Archimedes type dishes in the existing air-conditioning scroll compressor.1 is price fixing among the figure, the 2nd, and Moving plate.

Fig. 2 is the utility model threephase motor phase shortage and phase sequence relay electricity functional-block diagram.11 expression controllable silicon DC operation stabilized voltage power supplys among the figure, 12 expression controllable silicon operating circuits, 13 expression circuit of testing the phase sequence, 14 expression lack detection circuits.

Fig. 3 is threephase motor phase shortage and the phase sequence relay physical circuit schematic diagram of an embodiment of the utility model.

Fig. 4 is a controllable silicon DC operation voltage-stabilized power supply circuit schematic diagram shown in Figure 3.

Fig. 5 is a controllable silicon operating circuit schematic diagram shown in Figure 3.

Fig. 6 is a circuit of testing the phase sequence schematic diagram shown in Figure 3.

Fig. 7 is a lack detection circuit schematic diagram shown in Figure 3.

Embodiment

By following embodiment the utility model is further elaborated.

Referring to Fig. 2-shown in Figure 7, threephase motor phase shortage and phase sequence relay that a kind of compressor of air conditioner is used, it mainly is made up of controllable silicon DC operation stabilized voltage power supply 11, controllable silicon operating circuit 12, circuit of testing the phase sequence 13, lack detection circuit 14.The components and parts of foregoing circuit are welded on the printed substrate and are installed in the protector outer casing, use epoxy encapsulation.

Controllable silicon DC operation stabilized voltage power supply 11 shown in Figure 4, adopting alternating current 220V is that (T, N) is power supply, behind resistance R 1, R2, capacitor C 1 resistance-capacitance depressurization, after diode D1, voltage-stabiliser tube DW, C2 rectification, voltage stabilizing, filtering, obtain the voltage stabilizing dc supply again.

Fig. 5 is a controllable silicon operating circuit 12, and the miniature relay J and the unidirectional controllable silicon S CR that are powered by voltage stabilizing dc supply 11 form.

Fig. 6 is a circuit of testing the phase sequence 13, forms circuit of testing the phase sequence by resistance R 4, capacitor C 4, resistance R 5, and diode D2, resistance R 3, capacitor C 3 are formed anti-jamming circuit and provided reliable direct current trigger current to controllable silicon SCR.

Fig. 7 is a lack detection circuit 14, forms lack detection circuit by resistance R 6, R7, R8, and capacitor C 5, diode D3 form anti-jamming circuit and provide reliable direct current trigger current to controllable silicon SCR.

The arbitrary of three phase mains (R, S, T) incoming call goes into to insert the series loop of being made up of normally-closed contact J1 and the A.C. contactor Km coil of miniature relay J from L, makes A.C. contactor Km adhesive, above-mentioned protector work.

(1) phase sequence: referring to shown in Figure 6; the circuit of testing the phase sequence input inserts appointing in the two-phase of threephase motor D input; for example T ' mutually with S ' mutually in; because the electric current of T ' phase is 120 ° with S ' current and phase difference mutually; cancel out each other; the output of diode D2 no current, unidirectional controllable silicon S CR is in off state, and relay J is not worked.Work as T ', S ' phase sequence connects inverse time; then T ' phase current lags behind 60 ° in S ' phase current; to there be 5mA left and right sides electric current to export a point to; trigger unidirectional controllable silicon S CR conducting through diode D2; relay J gets electric adhesive, and normally-closed contact J1 disconnects, and contactor Km coil losing electricity quits work; main contact Km1, Km2, Km3 disconnect, and load motor D cuts off the power supply and is protected.

(2) open-phase protection: three phase mains just often, it is zero that artificial mid point b point is held the voltage of N over the ground.As three phase mains R ', S ', T ' is a certain when opening a way mutually because load is constant, all the other biphase currents are inevitable to be increased suddenly, artificial mid point b point no longer is zero to the voltage of N.According to calculating, this moment, artificial mid point b point was half of three-phase line voltage to the voltage of N, i.e. 190V.It is to capacitor C 5 chargings and provide trigger current to unidirectional controllable silicon S CR after diode D3 rectification, makes controllable silicon SCR conducting, miniature relay J obtain electricity work adhesive.Normally-closed contact J1 opens the working power of cutting off A.C. contactor Km coil, and compressor of air conditioner, threephase motor D dead electricity as load are quit work.Reach the safeguard protection purpose.

Claims

1, threephase motor phase shortage and phase sequence relay that a kind of compressor of air conditioner is used, comprise protector outer casing and dress printed substrate within it, this printed substrate is equipped with three phase mains lack detection circuit and circuit of testing the phase sequence, threephase motor (D) input (R ', S ', T ') main contact (Km1 by A.C. contactor (Km), Km2, Km3) with three phase supply power supply (R, S, T) be connected, it is characterized in that: described power supply phase shortage and phase sequence relay also are provided with the controllable silicon operating circuit, and the one-way SCR of this circuit (SCR) is connected with relay (J) coil and inserted in its DC operation stabilized voltage power supply; Described power supply lack detection circuit input and threephase motor (D) input (R ', S ', T ') are connected, and its output is connected with one-way SCR (SCR) trigger electrode (G) by diode D3; The Ren Erduan and the ground end of described power phase testing circuit input and threephase motor (D) input (R ', S ', T ') are connected, and its output is connected with one-way SCR (SCR) trigger electrode (G) by diode D2; Insert in the 220V AC power that is provided by three phase supply power supply (R, S, T) arbitrary phase and ground end (N) after described relay (J) normally closed interlock (J1) is connected with A.C. contactor (Km) coil, described controllable silicon (SCR) DC operation stabilized voltage power supply input also inserts in this 220V AC power.

2, threephase motor phase shortage according to claim 1 and phase sequence relay; it is characterized in that: in the described power phase testing circuit; electric capacity (C4), resistance (R4) series connection back one end and threephase motor (D) input (T ') be connected; the other end is connected with node (a); resistance (R5) is connected between threephase motor (D) input (S ') and the node (a); be connected to after resistance (R3), electric capacity (C3) parallel connection between node (a) and the ground end (N), described node (a) is connected with diode (D2) anode.

3, threephase motor phase shortage according to claim 1 and phase sequence relay; it is characterized in that: in the described power supply lack detection circuit; resistance (R6, R7, a R8) end is connected in the node (b); its other end is connected to three inputs (T ', S ', R ') of threephase motor (D) respectively; described node (b) is connected with diode (D3) anode, is connected to electric capacity (C5) between node (b) and ground end (N).

4, threephase motor phase shortage according to claim 1 and phase sequence relay; it is characterized in that: in the described controllable silicon DC operation stabilized voltage power supply; resistance (R2), electric capacity (C1) back in parallel one end are connected with resistance (R1); the other end is connected with diode (D1) anode; diode (D1) negative electrode is connected with node (E); resistance (R1) other end inserts in the described 220V AC power; voltage stabilizing didoe (DW) is connected with node (E) with electric capacity (C2) back in parallel one end, and the other end is connected with ground end (N).