TW397903B - The freezing-type low-dew-point drying control method for compressed air - Google Patents

Abstract

This is a freezing-type low-dew-point drying controlling method for compressed air. This is especially designated for a low pressure cooling media; its vaporization temperature is below 0 degree Celsius. This low temperature is utilized to properly condense the vapor water content in the compressed air. This control method also will not freeze inside and clog the compressed air pipeline. Its main features are to provide two passable vaporizers on the compressed air pipeline, which is controlled by a 3-way valve for the flow direction of the compressed air. A heat exchanger is equipped within the cooling media system to provide rising temperature at the compressed air outlet and the required condition for cooling media heat dissipation. Meanwhile, the front of the heat exchanger enables lower under-cooling temperature to the high-pressure liquid cooling media. Using the equipped 4-way valve, these two vaporizers generating cooling effect are enabled by turns. Through the use of solenoid valve to control and bring high temperature cooling media into the freezing vaporizers, ice is melt rapidly and water is discharged outside the system. Two pressure sensors are equipped at air inlet and outlet respectively; one temperature detector sends back the detecting value to the microprocessor. Thus, the microprocessor is able to handle and control temperature and pressure variations to provide control sequence for the 3-way and 4-way valves and solenoid valves. Compressed air with good drying quality can be produced.

Description

V. Description of the invention (1 A7 B7 Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs, which states that there is a control method for condensing and discharging water in compressed air, especially a low-pressure refrigerant whose evaporation temperature can be lower than 0 ° C. In the following, the "frozen compressed air low dew point drying control method" will be completely condensed and discharged by using the water and button system of Wen Lin, which will not cause ice blockage in the compressed air pipeline. The application of compressed air ^ is very wide, For example, all kinds of pneumatic tools, pneumatic cylinders, air motors, etc., but the water vapor contained in the compressed air will cause corrosion of various application components or equipment, affecting its life and operating accuracy, so it is necessary in the factory Install an air dryer to remove the moisture in the compressed air to obtain compressed air with better dryness. Please refer to Figures 1, 2, and 3 shown here for the structure of a conventional refrigerated air dryer. Flow chart of compressed air, one of which is that the flow of compressed air is input into the evaporator 15, and the heat of the compressed air is absorbed by the low-temperature liquid refrigerant. The water vapor is condensed into water and discharged. 2. Refrigerant flow (1) Refrigerant compressor The refrigerant is compressed by the refrigerant compressor 11 to form a high-pressure gaseous refrigerant. (2) Condenser The refrigerant is input into the condenser 12 to dissipate heat and form a high pressure. Liquid refrigerant at normal temperature》 (3) Filter High-pressure liquid refrigerant at normal temperature removes impurities through filter 13. This paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) 83.3.10,000 (Please read the notes on the back first (Please fill in this page)

V. Description of the invention (2 A7 B7 Printed by the Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs (4) Capillary 1 The high-pressure and normal-temperature liquid refrigerant expands and evaporates through the capillary 14 to produce a cooling effect. (5) The evaporator low-temperature refrigerant is input into the evaporator 15, It absorbs the heat of the compressed air flowing through the evaporator 15 and causes the water vapor of the compressed air to condense into water due to low temperature and discharge. The refrigerant absorbs the heat of the compressed air to form a saturated gaseous refrigerant. (6) Return to the refrigerant dust The compressed air absorbs the heat of the compressed air and becomes the energy gas of the reconciliation. The refrigerant is returned to the refrigerant compressor 11 and circulates again. The hot gas bypass valve 16 on the high and low pressure side of the refrigerant compressor 11 is mainly used to control the low pressure side. Refrigerant evaporation temperature is maintained at about 2 ° C to avoid. Severe freezing of evaporator 15 blocks the path of compressed air. This is because water will gradually form thin ice at 0.4 ° C. The formed ice layer will not only be able to run stably for a long time, but will eventually lead to the blockage of the refrigerant and the air pipeline. Pressure and the refrigerant in the evaporator 15 cannot absorb the heat of the compressed air, its liquid refrigerant does not completely evaporate and returns to the refrigerant compressor U, resulting in the disadvantage of liquid compression and damage. In addition, the hot gas bypass valve 16 serves as stability The work of refrigerant evaporation temperature 'is to directly bypass the high pressure and high temperature gaseous refrigerant on the south pressure side to the low side to avoid the refrigerant evaporation temperature being too low, but it will cause the refrigerant compressor to perform virtual work and reduce the refrigerant limit. The refrigerating capacity of compressor 11 forms the cost of energy. (Please read the note on the back first # Fill this page)

Thai paper conforms to Chinese National Standard (CNS) Ba Ju ^ (210 > < 297 public shame) 83.3.10,000

V. Description of the invention Including) Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs. From the above, it can be seen that it is not a good operation mode and method in terms of practical use. It cannot obtain good drying effects, and it is virtually wasteful. More energy. Please refer to Figure 4 'for a schematic flow chart of another type of air drying equipment. As shown in the figure, the chemical hygroscopic agent is placed in two adsorption buckets 耵 and ^, and a four-position valve 61' is provided at the air inlet. The valve ports are respectively connected to the inlets and exhaust ports of the two suction buckets τι, T2, and cooperate with the check valves 1 and 2 connected to the outlets of the two suction buckets, and a small pipe diameter is provided on each side of the check valve. Bypass pipes 62 and 63, so that the two suction buckets T1 and T2 can work alternately and reduce the hygroscopic agent (when the suction bucket T1 performs drying work, the hygroscopic agent in the suction bucket T2 is in a reduced state. After drying, the atmospheric dew point can reach 4 (TC, the method in Figure 1 is about 23 ° C, although the drying effect is better than that in Figure 1, but the absorption bucket T2 on the reducing side will consume 15% of the Compress the air in order to achieve the reduction purpose of its hygroscopic agent, and the hygroscopic agent in the dry side is gradually saturated due to absorption of water vapor, so its air drying effect changes accordingly, and its two suction buckets, T2 work alternately It is a fixed time period and cannot provide users with the actual wind. The size is adjusted because After treatment, the drying quality changes greatly. At the same time that the air compressor creates compressed air, it also generates oil mist, which flows out with the compressed air. Therefore, a filter must be installed at the inlet to filter out the oil mist to avoid oil mist. After entering, it adheres to the surface of the hygroscopic agent, which affects the drying effect and the use of the command. In terms of actual use, the purchase cost is high, and the chemical hygroscopic agent still has a life span. It is necessary to absorb the two suction buckets. Wet medicine is completely renewed, so it not only causes inconvenience to the user, but also raises the cost and abandons the concern that the chemical hygroscopic agent pollutes the environment, so it is not a good creation. Ge Qingcong Qingyuan W (CNS) M? 21〇χ297 Gongshi 83. 3.10,000 (Please read the notes on the back before filling this page}

V. Description of the invention (4 V. Description of the invention (4

The media '4 & needs to be managed to stabilize its cooling temperature at 2. 〇 About 9 birds, _ age of air drying guide ‘Set capacity ίί = silk square wire to avoid cooling temperature, you need to add q control, so indirect energy consumption. Good drying effect, but its principle also needs to eliminate air contraction, which is not consistent with the benefits. The effect of decaying Si = quality §g varies, and the wet medicament mixes and blends the dough machine. Its chemical chemistry is detailed, although there is a reduction, but the effect gradually decreases with use time, so it needs to be filled with medicine if 药Second, it will not only cause inconvenience to maintenance, increase the cost, but also easily cause waste hygroscopic agents to pollute the environment. In view of the above-mentioned shortcomings in compressed air drying, the inventor of this case has made intensive research based on his many years of experience in the production of refrigerated air dryers. After continuous trial and improvement, he finally developed the present invention, this "frozen compressed air "Low dew point drying control method", and in order to allow Jun Jugui's review members and those who are familiar with this technology to fully understand the efficacy, steps of the present invention, the illustrations and figure numbers are described later: Printed by the Ministry of Central Standards Bureau J Industry Consumer Cooperatives ---- if (Please read the precautions on the back before filling this page)

1T Figure 1 is a flow chart of a conventional refrigerated air dryer. Figure 2 is a flow chart of a refrigerant of a conventional refrigerated air dryer. Figure 3 is a flow chart of a compressed air of a conventional refrigerated air dryer. Applicable to China National Standard (CNS) A4 specification (210X297 mm) 83. 3.10,000 V. Description of the invention (5 A7 B7 schematic diagram Figure 6 series machine configuration diagram Figure 7 is the refrigerant flow chart of the present invention Figure 8 ~ 10 series The process flow diagram of the invention is as follows: The hot air bypass valve A, B, 15 evaporator 21 air pre-cooler 33, 12 condenser 22, 23 automatic drain 24 heat exchanger 41, 411, 42, 43, 44 Air line 31, 11 Refrigerant compressor 32, 34, 241, 242 Refrigerant line 36, B 38, 38 39 39 Refrigerant line 35, 13 Filter 37, 14 Capillary 51 Three-position valve 52 Solenoid valve 53, 61 Four-position valve 62, 63 Bypass pipe I, Π Pressure sensor m Temperature sensor p Microprocessor H, T2 Suction barrel is printed by the Consumer Cooperative of the Central Standards Bureau of the Ministry of Refrigerated Air Dry Economy of the present invention Please refer to the distribution shown in Figures 5, 6, and 7. The air-condensing pipelines only have two evaporating fi 丄 s and are controlled by the three-position 阙 51. The air-condensing flow direction can provide the σ compressed air temperature rise and refrigerant dispersion in the refrigerant-based exchanger 24. The front section of the heat exchanger 24 can supply more high-temperature liquid refrigerant with more subcooling temperature, and the two evaporators A and B are controlled by the four-position valve to take turns to cool, and is controlled by the solenoid valve 52 to introduce high-temperature refrigerant. In the icing evaporator A, it melts and discharges quickly; there is also-only 'a' sense of degree 8- This paper size applies to China National Standard (CNS) A4 specification (210X297 mm) 83.3.10,000 (please (Read the notes on the back before filling out this page)

V. Description of the invention (6) A7 B7 Printed by the Central Standards Bureau of the Ministry of Economic Affairs, Zhengong Consumer Cooperative Co., Ltd.] On the refrigerant low-pressure return line, two pressure sensors I and I are placed on the inlet and outlet of the compressed air. The temperature or pressure changes detected by the sensors I, it, and m change the control sequence of the three-position valve 51, four-position valve 53, and the electromagnetic 阙 52 to change the flow direction of compressed air and refrigerant, which can achieve low-temperature dry compression The effectiveness of air improves the quality of compressed air. The steps of refrigerant flow before and after freezing of evaporator A and the compressed air flow are explained later (please show as shown in Figures 5 and 7) (1) Refrigerant flow before evaporator A is frozen Please refer to Figure VII: (1) Compressor of refrigerant compressor: First, the refrigerant compressor 31 compresses to become high-pressure high-temperature gaseous refrigerant. (2) Heat exchange with air in the heat exchanger: The high-temperature and high-pressure gaseous refrigerant is input into the refrigerant pipe 241 at the rear end of the heat exchanger 24 through the refrigerant pipe 32, so that the compressed air and the high-pressure gaseous refrigerant exchange heat, so that The compressed air is discharged as dry air at room temperature. (3) Condenser heat dissipation: The high-temperature and high-pressure gaseous refrigerant is radiated through the condenser 33 and becomes a high-pressure and normal-temperature liquid refrigerant. (4) Filters filter impurities: liquid refrigerant at high pressure and normal temperature is input to filter 35 through refrigerant pipe 34 to filter out impurities. (5) Increase the supercooled temperature of saturated liquid in heat exchanger: Input high pressure normal temperature refrigerant to remove impurities The front end of the heat exchanger 24 (please read the precautions on the back before filling this page) The paper Λ scale is applicable to the Chinese National Standard (CNS) A4 specification (21 ox297 mm) 83 · 3 · 1〇, 〇〇〇〇7 (7) Description of the invention (7) The central government bureau of the Ministry of Economic Affairs has printed the refrigerant medium pipe 242 in the Consumer Cooperatives, so that the refrigerant can increase the supercooled temperature of the saturated liquid. (6) Flow direction control of four-position valve: Refrigerant is controlled to flow into evaporator B through four-position valve 53. (7) Expansion and evaporation of the capillary tube: The refrigerant is introduced into the capillary tube 37 via the evaporator B to expand and evaporate. (8) Heat absorption in evaporator A The refrigerant flows into evaporator A, and the condensed air passing through evaporator A cools and exhausts heat, condenses water vapor in the air, and the refrigerant absorbs heat and becomes a saturated gaseous refrigerant. (9) Return to the refrigerant compressor for recycling: Saturated gaseous refrigerant is conducted into the refrigerant pipeline 381 through the west position 53 of the refrigerant pipeline 38 and returned to the refrigerant compressor 31 for recycling. (2) Evaporator A freezes The flow of the front compressed air: (please match as shown in Figures 5 and 6) (1) Cooling of the front cooler: The compressor first flows into the air precooler 21 to cool down to normal temperature. (2) Condensed water in evaporator A: Compressed air at normal temperature is controlled by three-position valve 51 of air pipe 41 and guided into evaporator A. The refrigerant flowing through evaporator A absorbs the heat of compressed air, making it compressed. The water vapor in the air is condensed into water at low temperature, and the water is discharged by the automatic drainer 22, so that the compressed air is cooled and dried. —This paper applies CNS (210X297mm) " ~~ 83.3.10,000 (Please read the precautions on the back before filling this page)

Printed by the Consumers' Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs A7 B7 V. Description of the invention g) (3) Dry air raised to normal temperature in the heat exchanger: > Compressed air is cooled to form dry air and input into the heat exchanger It j presses the heat of the liquid refrigerant at normal temperature, which absorbs the heat of the "pressure = air l refrigerant" and becomes the normal temperature and dry high-quality compressed air. The high-pressure normal temperature dry compressed air can be input into various types of pneumatic tools, machinery ... In addition, the pressure sensor jπ provided at the air inlet and outlet and the temperature sensor provided with the low-dust refrigerant pipeline 381 return the measured pressure and temperature values to the microprocessor P. Comparative calculation, when there is a slight difference between the inlet pressure and the dust force at the outlet, 'it means that the ice layer has accumulated in the evaporator A, and the microprocessor ρ will actuate the four-position valve 53' to change the refrigerant flow direction, so that the evaporator a is no longer Refrigeration, as shown in Fig. 8, the refrigerant at the front end of the heat exchanger 24; the refrigerant output from the circuit 242 is guided into the evaporator A through the four-position valve 53, and then expanded into the evaporator B through the expansion and evaporation of the capillary tube 37, and the refrigerant is refrigerated. By four Guide 53 into the refrigerant compressor 31 to circulate; at this time, because the ice layer in the evaporator a has not yet melted, 'the proper coldness is still maintained', the compressed air is still guided into the evaporator A, and it will not affect the compressed air. Dry quality, and because the temperature of evaporation Γ′Β has not fallen to the required low temperature, the temperature measured by the temperature sensor ffl is high. When the temperature in evaporator B drops to the required operating temperature, After receiving the signal, the microprocessor ρ will actuate the Sanwei 51 and the solenoid valve 52, as shown in Figure 9, to change the direction of the compressed air into the evaporator B. At the same time, the high-pressure high-temperature gaseous refrigerant passes through the solenoid valve 52 and passes through the four-position The space 53 directly enters the evaporator A, thereby quickly melting the frozen ice and discharging it through the automatic drainage device 22. When the ice layer in the evaporator A is completely melted, the paper size can no longer be obtained due to the high-pressure refrigerant. Applicable to Chinese National Standard (CNS) A4 specification (21〇 > < 297mm) (Please read the precautions on the back before filling this page)

A7 B7 Five invention descriptions g, when it dissipates heat: Therefore, its low pressure returns, and the temperature of the flow refrigerant rises and stops slightly (as shown in Figure 10, t is so small, such as f 53, electromagnetic 阙 52, etc., which makes the evaporators A and B The cross-pier dryer has high quality and can reduce energy consumption. According to the preamble, the following advantages can be summarized in the present invention: L 3 is considered to be strictly blocked, so its evaporation temperature can be established below 0. t mining Microprocessor monitoring is used by officials, so its air-drying === ring can be repeated, so its air line ®-printed by the Staff Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs > .it

Ns 6 I Standard # Male 7 9 2

Claims (1)

Patent application scope ABCD Printed L Γί cold air low dew point drying control method by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economics, in which compressed air is cooled to normal temperature by a cooler, and the heat of the medium is reduced to the normal temperature. The pipeline shrinking machine passes the high-pressure high-temperature gaseous refrigerant through the refrigerant pipeline at the rear end of the refrigerant 1 ^? 22 ^, so that the compressed air is exchanged with the high-dust medium, so that the test air becomes a dry liquid refrigerant at normal temperature, and the impurities are filtered through the filter, and Convey the hot chili, f is the refrigerant pipeline at the end to increase the subcooling temperature i of the saturated liquid i, it, the guided evaporator b, and flow through the capillary lincon to guide the inside of the evaporator ash to refrigerate and absorb the evaporator. Compress the air, lt <: Γ amount, and the refrigerant becomes a saturated gaseous refrigerant, which is recirculated to the compressor through a four-position plutonium. When it is set at the air inlet and outlet, there will be some differences between the f forces, that is, the evaporator There is a layer in A, and the microprocessor P causes the four positions to operate, changing the flow direction of the refrigerant so that the evaporator A is no longer cooled, and the evaporator B is cooled. • The cold-image-type shrinkable air with low dew point dryness = manufacturing method described in item 1 of the Mao Mao patent scope, in which the HP treatment of the HP feedback allows the evaporator 8 to be cooled even if the three-position valve and the solenoid valve are operated separately, making the calendar shrink The air flow direction changes into evaporator B, and at the same time, the high-pressure and high-temperature gaseous refrigerant passes through the solenoid valve, and directly enters evaporator A through the four-position valve, thereby quickly dissolving the ice layer formed and the ice layer in evaporator A. When fully melted, the high-pressure refrigerant can no longer properly dissipate heat, so its low-pressure recirculated refrigerant temperature i (please read the precautions on the back 1 &-then fill out this page), 1T line t This paper standard applies to 6¾ standard rate (CNS) A4 specification (210X297 mm) 6. The scope of patent application A8 B8 G8 D8 will rise slightly, at this time the microprocessor P will stop the solenoid valve from this action. (Please read the notes on the back before filling out this page) Order -5: Printed by the Employees' Cooperatives of the Central Bureau of Standards, Ministry of Economic Affairs This paper size applies to China National Standard (CNS) A4 (210X297 mm)