CN201178301Y

CN201178301Y - Air-conditioner compressor protective circuit

Info

Publication number: CN201178301Y
Application number: CNU2008200338732U
Authority: CN
Inventors: 王阿杨; 蔡建祥
Original assignee: Shanghai Meishan Iron and Steel Co Ltd
Current assignee: Shanghai Meishan Iron and Steel Co Ltd
Priority date: 2008-04-08
Filing date: 2008-04-08
Publication date: 2009-01-07
Anticipated expiration: 2018-04-08

Abstract

The utility model relates to a protective circuit of an air conditioning compressor, and belongs to the technical field of an electric circuit. The protective circuit comprises a primary loop contactor of an air conditioning compressor motor, and further comprises an electric contact thermometer and a time-delay device. A probe of the electric contact thermometer is in close contact with the compressor casing. The normally open contact of the probe is in series connection with the time-delay device coil. The normally closed contact of the time-delay device is in series connection with the main loop contactor coil. The thermometer is further in parallel connection with a self-protecting loop near the electric contact of the thermometer, wherein the self-protecting loop is composed of a first normally open contact and a time delay break contact of the time-delay device, which are connected in series. The protective circuit has the advantages that a motor of the compressor is controlled to stop automatically, cooled completely for a period of time, and allowed to re-start when the comprehensive temperature of the air conditioning compressor exceeds the allowable temperature thereof, thereby ensuring the safe operation of the compressor.

Description

The compressor of air conditioner protective circuit

Technical field

The utility model relates to a kind of compressor of air conditioner protective circuit, and especially a kind of protective circuit of avoiding compressor to burn under hot environment belongs to the electric circuit technical field.

Background technology

No matter understand according to the applicant, be homemade or external air-conditioning, all is provided with the protective circuit of compressor.These protective circuits have two kinds substantially: 1, by the detection of electric current being played the protective effect to compressor; 2, play protective effect by being installed in thermistor in the compressed package to compressor.In these two kinds of protective circuits, the former is not with respect to ambient temperature, and only the electric current to compressor detects, as long as electric current fails to exceed rated current, protective circuit can not moved.Owing to be subjected to the influence of ambient temperature, the actual temperature of compressor may exceed allowable temperature, this moment, starting current was generally 7～8 times of rated current when compressor starts once more, thus the motor in the compressor still might be owing to the too high and electrical machine insulation puncture of temperature, burn.The latter adopts the thermistor that is installed in the compressed package that compressor is protected; though it is correct utilizing thermistor to protect thinking; but because thermistor belongs to the light current protection; after repeatedly overheated; the physical quantity of its resistance can change; the while thermistor is installed in the airtight compressed package, is difficult for checking changing, and scraps in case damage or inefficacy also can make compressor burn.

Retrieval finds, application number is that 8220152.2,93202073.9,93236454.3,200610013169.6 and 200410004813.4 Chinese patent application is relevant with this case.Wherein 8220152.2 mainly introduced under-voltage, momentary power failure delay protection device; 93202073.9 mainly introduced and had time-delay, current foldback circuit and drive circuit; Bring damage to protect unexpected power failure, the thermostat that starts suddenly, fiddles with etc. to compressor of air conditioner 93236454.3 mainly introduced; 200610013169.6 mainly introduced under high-temperature condition, controlled the standby evaporator of enabling on the condenser by pressure switch; Have reservation shape, be connected to the valve pocket on the fixed scroll 200410004813.4 mainly introduced by one, by promoting cylindrical valve and closing steam vent, increase input flow rate, the protection compressor.Analyze as can be known, these public technology all do not properly settle the protection problem of compressor of air conditioner under the hot environment.

The utility model content

Problem to be solved in the utility model is: propose compressor of air conditioner protective circuit under the hot environment of a kind of temperature rise (mainly being the temperature rise of freon) that can comprehensively take into account compressor of air conditioner inside and ambient temperature; thereby when temperature exceeds the temperature rise of permission, compressor is played practical protective effect.

The scheme that the utility model solves the problems of the technologies described above is: a kind of compressor of air conditioner protective circuit comprises compressor of air conditioner motor main circuit contactor; also comprise the electric contact thermometer and the time relay; the probe of described thermometer closely contacts with compressor case; it is often opened electric contact and connects with time relay coil; the normally-closed contact of the described time relay is connected with the major loop contactor coil, constitutes main control loop.Like this; the electric contact control time relay of thermometer; when in case the temperature rise of compressor exceeds allowable temperature; this often opens the coil of electric contact closed turn-on time of relay; and the normally-closed contact of the time relay disconnects; make compressor contactor coil dead electricity, then the compressor outage, thus play a protective role.

In order to prevent that compressor from starting repeatedly in the critical point of thermometer set point, the further perfect of above-mentioned protective circuit is the other self-keeping circuit who also is parallel with the time relay first normally opened contact and its time-delay break contact series connection formation of described thermometer electric contact.When the time-delay relay coil gets when electric, holding circuit latching relay coil gets.Because after the time-delay break contact generally was set in 20 minutes, even therefore compressor temperature descends, the thermometer electric contact disconnected again, starting once more after compressor electric motor also will be delayed time.

The utility model has the advantages that: when the integrated temperature of compressor of air conditioner exceeded its allowable temperature, the motor of compressor stopped automatically with controlled, fully just allowed to start once more after the cooling by a period of time ground, thereby had guaranteed the safe operation of compressor.

Description of drawings

Below in conjunction with accompanying drawing the utility model is further described.

Fig. 1 is the structural representation of an embodiment of the utility model.

Embodiment

Embodiment one

The protective circuit of present embodiment compressor of air conditioner under hot environment is changed a social system on original compressor of air conditioner JR-2000 controller basis as shown in Figure 1.Wherein outsourcing main devices title and corresponding sequence number see the following form

3	LD	Indicator light	AD11-25/21
3	LD	Indicator light	AD11-25/21	2	KS	The time relay	ST3P C-D
1	KT	Thermometer (live contact)	WSSX-401M	2	KS	The time relay	ST3P C-D
1	KT	Thermometer (live contact)	WSSX-401M	Sequence number	Code name	Title	Specification

Original contactor KM and fuse FR on the compressor of air conditioner motor main circuit.Transformation of the way part is seen frame of broken lines, and the probe of electric contact thermometer KT closely contacts with compressor case, and it is often opened electric contact and connects with time relay KS coil, and the normally-closed contact of this time relay is connected with major loop contactor coil KM, constitutes main control loop.The other self-keeping circuit who also is parallel with the time relay first normally opened contact and its time-delay break contact series connection formation of thermometer electric contact.In addition, the time relay second normally opened contact is connected with indicator light LD, constitutes the overtemperature indicating circuit.

The operation principle of this circuit: when thermometric temperature rise arrives design temperature; its electric contact KT closure; time relay KS gets; and the holding circuit that constitutes by the time-delay break contact of self and the normally opened contact of connecting makes time relay KS self-insurance; string is at the normally-closed contact of the controlled time relay KS of coil of compressor major loop contactor KM and disconnect; make the contactor KM dead electricity of compressor major loop; compressor electric motor outage as a result; play a protective role; the luminous warning of indicator light LD simultaneously; and fan coil FM is unaffected, continues the blowing cooling.Afterwards, through setting-up time (after common 20 minutes) time-delay relay K S opening time, control circuit resets, and compressor is resumed work, and has therefore avoided near the compressor electric motor Fraquent start thermometer set point.

In addition to the implementation, the utility model can also have other modes.For example, can protective circuit be set separately without the JR-2000 controller, or the like.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection range of the utility model requirement.

Claims

1, a kind of compressor of air conditioner protective circuit comprises compressor of air conditioner motor main circuit contactor, it is characterized in that: also comprise the electric contact thermometer and the time relay; The probe of described thermometer closely contacts with compressor case, and it is often opened electric contact and connects with time relay coil; The normally-closed contact of the described time relay is connected with the major loop contactor coil, constitutes main control loop.

2, according to the described compressor of air conditioner protective circuit of claim 1, it is characterized in that: the other self-keeping circuit who also is parallel with the time relay first normally opened contact and its time-delay break contact series connection formation of described thermometer electric contact.

3, according to the described compressor of air conditioner protective circuit of claim 2, it is characterized in that: the described time relay second normally opened contact is connected with indicator light, constitutes the overtemperature indicating circuit.