CN2272996Y

CN2272996Y - Frozen compressed air dryer

Info

Publication number: CN2272996Y
Application number: CN 96243202
Authority: CN
Inventors: 王仁松; 边晓明; 王勤俭
Original assignee: Wuxi Shengda Air Gas Purity Equipment Co Ltd
Current assignee: Wuxi Shengda Air Gas Purity Equipment Co Ltd
Priority date: 1996-11-26
Filing date: 1996-11-26
Publication date: 1998-01-21
Anticipated expiration: 2006-11-26

Abstract

The utility model relates to a frozen compressed air dryer, comprising an air precooler and an air cooler pipeline, wherein, a water separator and an automatic fluid discharging device are arranged in the pipeline, an evaporator with a cooling system is arranged in the air cooler, and the cooling system at least comprises a cryogen pipeline loop which is composed of a compressor, a condenser, an expansion valve, the evaporator and a compressing mechanism. The utility model is characterized in that a conducting pipeline and a stop valve are connected between the output pipeline foe the cryogen of the compressor and the inlet pipeline of the evaporator; the start and stop control end of the valve is connected with a pressure sensor or a temperature sensor for the evaporator.

Description

A kind of frozen compressed air dryer

The utility model relates to a kind of improvement of frozen compressed air dryer.

Compressed air has a wide range of applications in industrial pneumatic control and chemical industry, metallurgical production, yet because the existence of water in air gas, in pipeline and container, condense easily, pneumatic line is produced burn into ice berg, dirt and extremely obstruction, easily produce obstacle and influenced the operation of producing, obtain using more and more widely with the matching used compressor dryer of air compressor, wherein frozen compressed air dryer is the most frequently used compressed air drier.Its mechanism is same as traditional freezing type dehumidifier fully, can condense into liquid state when water in air gas runs into colder or cold excessively evaporator surface, and be discharged from, and reaches the purpose of removing moisture content.Yet for freezing dryer for compressed air, owing in the compressed air piping evaporimeter is housed, again because in order to improve the purpose of the efficient that dewaters, the pressure leak source temperature of cooler will be controlled at 0 ℃～10 ℃, especially it is the most reasonable to remove the aqueous vapor effect 2 ℃ (pressure leak source temperature), and it is freezing that the device that will avoid evaporating is simultaneously crossed cold generation, has not only influenced the efficient but also can freeze by evaporimeter on the air side pipeline of dewatering, cause blocked air line, influence the unobstructed of dry source of the gas supply air line; Secondly in refrigeration system, evaporator temperature is crossed when low, and low evaporating pressure makes refrigeration compressor work being lower than under the design pressure of inspiration(Pi) situation, because evaporation not exclusively causes liquid refrigerant impact compress machine, causes the liquid hammer accident, thereby decreases the ring compressor.Existing freezing type compressor air drying machine often adopts low pressure controller (pressure switch) to control the start-stop of compressor, though can guarantee evaporimeter does not freeze, but its deficiency has 2 points: the evaporator temperature scope is bigger, thereby it is make that dried air index (the pressure leak source temperature of air) fluctuation range is also big, and wayward; Next is that the air mass flow handled of relatively large compressed air drier is big, and the power of compressor is bigger, even reaches tens horsepowers, and the frequent starting of compressor is closed and not only had influence on the life-span, also electrical network is constituted and disturbs or impact.

The utility model purpose is to overcome above-mentioned deficiency, a kind of working stability is provided, cooler dew-point temperature precision is controlled the frozen compressed air dryer that suitable energy-saving effect is arranged again.

Technical solution of the present utility model is: comprise air precooler, aerial cooler pipeline, also be provided with separator and automatic drain device in the pipeline, aerial cooler is built-in with the evaporimeter that causes cool system, refrigerating system comprises the refrigerant pipeline loop that is made of compressor → condenser → expansion valve → evaporimeter → compressor at least, it is characterized in that being connected with conducting pipeline and stop valve between compressor refrigerant output channel and evaporator pipeline, the keying control end of valve is connected to evaporator pressure or temperature sensor.

The utility model pipeline and stop valve also can be described as exhaust by-pass valve, its course of work such as following: when the evaporating pressure of evaporimeter is lower than certain value, (be lower than uniform temperature) or the temperature of evaporimeter is crossed when low, provide a start signal, the stop valve conducting, because this bypass line resistance is much smaller than the heating power loop, and evaporimeter is evaporative cooling not, controlled and steamed device (being the aerial cooler sidewall) temperature, because the pressure differential at compressor inlet and outlet two ends greatly reduces, also reduced compressor load, and high-power compression function unloads automatically with the pressure load adjuster, thereby energy-saving and cost-reducing.

Characteristics of the present utility model except that can saving energy and reduce the cost,, cooler dew-point temperature control range precision height little to electric network influencing, thus the effective and quality of dry air is high, has not only avoided the evaporator air side to freeze but also has kept the normal pressure of inspiration(Pi) of compressor.Installing simple and reliable is another advantage.

The utility model is described in further detail below in conjunction with accompanying drawing with by embodiment:

Fig. 1 is the utility model structural representation:

Aerial cooler 10 built-in evaporators 4, stop valve 6 and pipeline A cross-over connection are between the refrigerant delivery outlet and evaporimeter 4 inlets of compressor 1, described stop valve adopts the automatic starter gate valve of pressure, and pressure controling parameter is adjustable, the pressure control end is in evaporator inlet or evaporator vessel connection or pass through the transmission of pressure transport membranes, when being reduced to the setting of valve under the evaporating pressure, valve is opened automatically, thereby compressor refrigerant circulates from the pipeline of filter 9 → pipeline A → stop valve 6 → evaporimeter 4 → knockouts 5 → filter 7 → get back to compressor 1, and when the evaporator temperature rising, evaporating pressure is elevated to the pressure setting timing of stop valve, valve 6 cuts out, and refrigerant circulates with following pipeline: compressor 1 → filter 9 → pipeline B → condenser 2 → knockouts 5 → high pressure filter 8 → heating power expansion valve 3 → evaporimeter 4 → knockouts 5 → low-pressure filter 7 → get back to compressor 1.The effect of knockouts is to guarantee that refrigerant is gaseous state when getting back to compressor.As for air precooling pipeline, separator, automatic drain device and the same prior art of shell of air dryer, seldom give unnecessary details herein.Pressure-activated valve is the YKJ type, and controlled pressure is 3-5Kg.

Another embodiment is that described stop valve adopts electromagnet cut off valve, be provided with temperature sensor at the evaporimeter place and control magnetic valve through amplification and executive circuit, temperature sensor can adopt thermistor, thermal diode, amplifying circuit can be made of discharge circuit, pass through comparison circuit again, power circuit is transported to the solenoid-driven coil, and the temperature range of control stop valve make and break correspondence is 1～3 ℃.Temperature sensor can adopt mechanical temperature control, and the microswitch of interlock control electromagnet cut off valve break-make.Above-mentioned control circuit complete class is same as the temperature control equipment of refrigerator system, as WJ, WK type temperature controller.

Claims

1, a kind of frozen compressed air dryer, comprise air precooler, aerial cooler pipeline, also be provided with separator and automatic drain device in the pipeline, aerial cooler is built-in with the evaporimeter that causes cool system, refrigerating system comprises the refrigerant pipeline loop that is made of compressor → condenser → expansion valve → evaporimeter → compressor at least, it is characterized in that being connected with conducting pipeline and stop valve between compressor refrigerant output channel and evaporator pipeline, the keying control end of valve is connected to by evaporator pressure or temperature sensor.

2,, it is characterized in that described stop valve adopts the automatic starter gate valve of pressure by the described a kind of frozen compressed air dryer of claim 1.

3, by the described a kind of frozen compressed air dryer of claim 1, it is characterized in that described stop valve adopts electromagnet cut off valve, be provided with temperature sensor at the evaporimeter place and control magnetic valve through amplification and executive circuit.

4, by claim 1,2 described a kind of frozen compressed air dryers, it is characterized in that described magnetic valve adopts electromagnet cut off valve, be provided with the mechanical temperature controller at evaporimeter or cooling pipe place, and the microswitch of interlock control electromagnet cut off valve break-make.