Current, for frequency conversion refrigeration air-conditioner unit, rectifier in unit frequency-conversion device, inverter, IPM module, reactor constant power device in use can produce amount of heat, need effective type of cooling guaranteed output device be operated in reliable temperature range, at present conventional have modes such as air-cooled, water-cooled, refrigerant be cooling.
There is following problems in air-cooled technology:
1. wind-cooling heat dissipating ability, if cooling load demand is large, requires air quantity large, causes blower fan volume large;
2. Wind Volume causes fan noise bigger than normal;
3. reliability or the safe operation of air-cooled laying dust problem to electronic devices and components exerts an influence;
4. cooling blower modulability is poor, and energy consumption is high, not energy-conservation;
5. blower fan air draft causes unit installation environment temperature to raise, and need to increase corresponding air-conditioning system to machine room.
There is following problems in Water Cooling Technology:
1, need external supply and drain water system;
2, the easy fouling of water, causes the long-term rear cooling effect variation that uses;
3, the conductance of non-pure water is high, once pipeline leaks, will cause short circuit, causes unit to damage.
For the cooling technology of existing employing refrigerating system coolant, carry out cooling for draw high pressure refrigerant from condenser.In unit running process, from the high-pressure liquid refrigerant of condenser after throttling for cool electronic components and parts, the refrigerant return-air after heat absorption evaporation flows into evaporator.For this type of cooling, there are the following problems, and the refrigerant of drawing from condenser need to be used restricting element throttling, and cost is high, and cooling consumed refrigerant amount is large, reduced the efficiency of unit.
Utility model content
In order to overcome the deficiencies in the prior art, the utility model provides a kind of air-conditioning unit, to solve the problem that electronic devices and components cooling effect is poor, cost is high in air-conditioning unit in prior art.
A kind of air-conditioning unit, comprise refrigerating system and electric-control system, refrigerating system comprises compressor, condenser, evaporator, flash evaporation and restricting element, electric-control system comprises some electronic devices and components, air-conditioning unit also comprises the cooling branch road being connected between flash evaporation and evaporator or compressor, cooling branch road comprises cooler, and at least one in cooler and electronic devices and components is configured to heat transfer relation, makes this electronic devices and components cooling.
Further, comprise many cooling branch roads, on every cooling branch road, be at least provided with a cooler.
Further, cooler is multiple, series, parallel or series-parallel connection between multiple coolers.
Further, cooling branch road also comprises the adjuster valve for regulating cold medium flux.
Further, adjuster valve is electromagnetically operated valve and/or choke valve.
Further, choke valve is electric expansion valve, heating power expansion valve, capillary or restricting orifice.
Further, also comprise the temperature sensor for detection of the temperature of cooler and/or variable frequency drive unit.
Further, also comprise the controller of the temperature value regulating and controlling valve opening for detecting according to temperature sensor.
Further, cooling branch road also comprises break valve.
Further, cooling branch road also comprises the filter of the refrigerant for filtering flash evaporation output.
Further, electronic devices and components comprise at least one in rectifier, inverter, frequency converter, reactor, power model, processor.
Further, air-conditioning unit is centrifugal refrigerating machines.
The beneficial effects of the utility model are: with respect to air-cooled and water-cooled, and the good cooling results that refrigerant is cooling, cooling effectiveness is high; Save air cooling system, make equipment volume little, reducing noise; Utilize the refrigerant of air-conditioning unit to complete kind of refrigeration cycle, make the power electronic device can be in closed environment, avoid dust impact, inner clean, service life be long; With respect to the type of cooling of drawing refrigerant from condenser, can save choke valve, reduce costs.
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
As shown in Figure 1, the air-conditioning unit of the present embodiment comprises the evaporator 10, compressor 20, condenser 30, flash evaporation 40 and the restricting element that form refrigerating system, restricting element comprise be connected in the first throttle element 51 between evaporator 10 and flash evaporation 40 and be connected in condenser 30 and flash evaporation 40 between second section fluid element 52.Compressor 20 is twin-stage or compound compressor, preferably centrifugal compressor, and the secondary compression air entry of compressor 20 is communicated with flash evaporation 40.Preferably, air-conditioning unit is handpiece Water Chilling Units, further, is centrifugal refrigerating machines.
The electric-control system of air-conditioning unit comprises some electronic devices and components, wherein portions of electronics components and parts, particularly semiconductor power device and the information processing chip larger needs of caloric value in the time of work are cooling, as rectifier, inverter, IPM module (Intelligent Power Module), chopper circuit, reactor and some CPU.
For the cooling electronic devices and components of cooling needs, air-conditioning unit also comprises cooling branch road, and this cooling branch road is connected between flash evaporation 40 and evaporator 10 or between flash evaporation 40 and compressor 20.This cooling branch road comprises cooler 60, and cooler 60 contacts or forms heat transfer relation near variable frequency drive unit, and the heat distributing while taking away electronic devices and components work by the low temperature refrigerant of circulation in cooler 60 is electronic devices and components cooling.
After air-conditioning unit starting, utilize the pressure differential between flash evaporation 40 and evaporator 10, make flash evaporation 40 export the liquid refrigerant of supercooled state, enter into cooler 60 through connecting line.Refrigerant absorbs the heat of vaporization of variable frequency drive unit herein, forms gaseous coolant and enters into evaporator 10 or compressor 20, again gets back in the cooling cycle system of air-conditioning unit.
Because the liquid refrigerants in flash evaporation 40 is in supercooled state, can utilize the direct cooling variable frequency drive unit of this refrigerant, in cooling branch road, choke valve can be set, make the cost of air-conditioning unit, due to choke valve not being set, the circulating resistance of refrigerant is little, refrigerant flowing velocity in cooling branch road is faster, in cooling branch road the cycle of refrigerant circulation short, the coolant quantity by cooler 60 in the unit interval is larger, heat absorption capacity is stronger, and cooling effectiveness is higher.But the output of the cold of cooler 60 should not be controlled, and there will be supercooled phenomenon.
In order to strengthen the control of the cold output to cooler 60, make variable frequency drive unit in suitable temperature range, in this cooling branch road, be also provided with the adjuster valve 70 for regulating cold medium flux.Adjuster valve 70 can be electromagnetically operated valve, or has the choke valve of throttling action, as electric expansion valve, heating power expansion valve, capillary or restricting orifice and the wherein combination of two or more throttling device.In the time that adjuster valve 70 is electromagnetically operated valve, electromagnetically operated valve can arrange on the optional position of cooling branch road; In the time that adjuster valve 70 is choke valve, choke valve is located between flash evaporation 40 and cooler 60, with the liquid refrigerants throttling to flash evaporation output.In order further to strengthen the control to refrigerant in cooling branch road, also can not only electromagnetically operated valve be set but also choke valve is set.In cooling branch road, arrange after choke valve, can further reduce the temperature of the refrigerant that enters cooler 60, can reduce the required coolant quantity of cooling variable frequency drive unit.
Preferably, on the liquid flowing tube road before choke valve, be also provided with filter, keep the fail safe of choke valve operation.
Preferably, be provided with break valve at arrival end and/or the port of export of cooling branch road, be convenient in emergency circumstances control opening or turn-offing of cooling branch road, and be convenient to replacing and the maintenance of accessory in cooling branch road.
Air-conditioning unit also comprises the temperature sensor for detection of electronic devices and components temperature or chiller temperature, and this temperature sensor is affixed on electronic devices and components or cooler surface, or embeds in electronic devices and components or cooler.The controller of air-conditioning unit is according to detecting that temperature carrys out the aperture of electromagnetic valve for adjusting and/or choke valve, so that electronic devices and components are in suitable temperature range.Except avoiding excess Temperature, also to prevent that temperature is too low, the too low meeting of temperature makes electronic devices and components and supporting member thereof as the stress ability to bear decline of circuit board or shell body, be hit, vibrate easy fault or damage, and low temperature also can make components and parts surfaces form condensation, the appearance meeting of condensation brings potential safety hazard to electronic information, electrical system.
Cooler 60 is the inner metallic cold plate that is embedded with refrigerant flow path, metallic cold plate contacts with power electronic device, also can be according to the factor such as shape, cooling requirement of site environment situation, electronic devices and components, select suitable cooler type, for example, for can not contact heat-exchanging or to cooling less demanding device, can select fin-tube heat exchanger, finned plate heat exchanger etc. as cooler.
Preferably, electronic devices and components and cooler 60 are arranged in the housing of a sealing, inner surface and/or the outer surface of housing are provided with insulation material, to reduce the heat transmission of cooler 60 and outside air, reduce loss of refrigeration capacity, improve utilance and the cooling effectiveness of refrigerant, due in enclosed environment, can also prevent the impact of dust accumulation on heat radiation, not contact with outside air and can also prevent that condensation from appearring in too low variable frequency drive unit and cooler 60 surfaces of making of temperature.
Electronic devices and components comprise at least one in rectifier, inverter, frequency converter, reactor, power model, processor.
According to the technical scheme of embodiment mono-, solve the cooling technical problem of variable frequency drive unit in prior art, safe and reliable, and it is high to improve cooling effectiveness, reduces the cost of air-conditioning unit.
If desired the quantity of cooling power electronic device is more, or be subject to the restriction of installing space, set structure, cannot complete cooling by a cooler, many cooling branch roads in parallel are set between flash evaporation 40 and evaporator 10 or compressor 20, every cooling branch road is provided with at least one cooler, and adjuster valve is set on demand, adjuster valve is electromagnetically operated valve and/or choke valve.The difference of the present embodiment and embodiment mono-is, comprises many cooling branch roads.
As shown in Figure 2, for the present embodiment is with the air-conditioning unit schematic diagram of many cooling branch roads.The liquid refrigerants of exporting from flash evaporation 40, after part flow arrangement shunting, enters the three cooling branch roads in tunnel (three cooling branch road also can directly be connected with flash evaporation 40 respectively), is equipped with adjuster valve 70 and cooler 60 on every branch road.The present embodiment is take cooling air conditioning frequency converter as example, and this frequency converter comprises rectifier, inverter and reactor, respectively with every branch road on cooler 60 be configured to heat transfer relation, be the coolings of these components and parts by cooler 60.Further, on pipeline before liquid refrigerants shunting or after heat absorption is confluxed, a total adjuster valve also can be set, if before being arranged on liquid refrigerants shunting, this total adjuster valve is electromagnetically operated valve and/or choke valve, after if arrange, refrigerant confluxes, this total adjuster valve is electromagnetically operated valve.
Because rectifier wherein and the heat radiation of inverter are had relatively high expectations, the first branch road adjuster valve 70a on two branch roads and the second branch road adjuster valve 70b are adjustable adjuster valve, as electric expansion valve, adjustable orifice plate or electromagnetically operated valve, regulate the aperture of this adjuster valve according to the actual temperature of rectifier and inverter, to obtain suitable cold medium flux.The 3rd branch road adjuster valve 70c being positioned on another article of branch road can adopt fixed adjuster valve, as fixing orifice plate or capillary, mates best restricting element parameter according to systematic function.Be wherein that rectifier and inverter contact with metallic cold plate with the metallic cold plate structure of refrigerant circulation pipeline for the cooler of cooling rectifier and inverter, the cooler of cooling reactor is metal pipe structure, is wrapped on reactor.The cooling effect of the relative wind-cooling heat dissipating of this radiating mode is better, and cooling rate is fast, cooling effectiveness is high, can greatly reduce the requirements of type selecting of volume and the element of current transformer.
Wherein rectifier and inverter also can be cooling by a cooling branch road, and rectifier arranges two coolers of connecting on same cooler or on a branch road with inverter arrangements, and two coolers are respectively rectifier and inverter is cooling.Can reduce like this control of Dui Yi road adjuster valve, simplify control and saving components and parts, reduce costs.
The cooling system providing according to the utility model can well solve the cooling problem of power electronic device, and the cooling capacity of refrigerant is better than air-cooled and water-cooled; Can also be according to cooling requirement, regulate the flow of each branch road refrigerant; Refrigerant is insulator, does not have short circuit or electric leakage hidden danger, safe, utilizes the refrigerant of air-conditioning unit to complete kind of refrigeration cycle, makes the power electronic device can be in closed environment, avoids dust impact, and inner clean, service life is long.
Because the refrigerant for cooling use is taken from flash evaporation, in supercooled state, can cancel choke valve, reduce costs, owing to cancelling choke valve, in cooling branch road, refrigerant flow rate is that cooling capacity is stronger sooner.In order to improve cooling control precision, adjuster valve also can be set, but with respect to prior art, because refrigerant temperature is lower, cooling needed coolant quantity can reduce, reduce the cooling medium charging amount of unit, reduce the size of choke valve, also can reduce costs.
To sum up, according to the technical solution of the utility model, can guarantee fully cooling to electronic devices and components, can reduce the cost of air-conditioning unit, improve cooling capacity and cooling effectiveness, improve the efficiency of unit.
The above embodiment has only expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.