CN101226024A - Pre-emptive air dryer control in a compressed air system - Google Patents
Pre-emptive air dryer control in a compressed air system Download PDFInfo
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- CN101226024A CN101226024A CNA2008100014422A CN200810001442A CN101226024A CN 101226024 A CN101226024 A CN 101226024A CN A2008100014422 A CNA2008100014422 A CN A2008100014422A CN 200810001442 A CN200810001442 A CN 200810001442A CN 101226024 A CN101226024 A CN 101226024A
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Abstract
A fluid compression system includes a compressor operable to produce a first flow of compressed fluid and a refrigerated dryer coupled to the compressor and operable to separate the first flow of compressed fluid into a second flow of compressed fluid and a flow of liquid. A first sensor is positioned to measure a property of the second flow of compressed fluid, and a controller is operable to initiate operation of the refrigerated dryer at a first time and at least partially in response to the measured property, and to initiate operation of the compressor at a second time. The first time is before the second time.
Description
The cross reference of related application
The application requires to enjoy the rights and interests of the U.S. Provisional Application submitted on January 19th, 2007 number 60/881307.In this section listed first to file by reference integral body be incorporated herein.
Technical field
The present invention relates to a kind of compressor assembly that comprises air dryer, relate in particular to a kind of compressor assembly that comprises air dryer with preferential air dryer control.
Background technology
Air dryer is generally used in the compressed air system, so as air be compressed and from air compressor, discharge the back from air, remove anhydrate, steam and other pollutant of lubricant, water and lubricant.Has the multiple air dryer that can realize this function.
One type air dryer is the circularly cooling drier, and this circularly cooling drier circulates intermittently so that its cold-producing medium maintained the specified temp that is used for cooled compressed air.These air dryers open or close together in company with air compressor usually, thereby start or stop air dryer by air compressor control.Like this, air dryer keeps cutting out as long as air compressor driver (for example motor, engine etc.) does not move then.Similarly, then air dryer starting when air compressor starts.
Summary of the invention
Some air compressor systems are at the middle unoccupied place air supply of processing and similarly, air compressor and drier can quit work for a long time.When air compressor and drier quit work for a long time, the refrigerant temperature of drier can significantly raise and exceed its optimized operation value.When needs compressed air, then reset air compressor and air dryer.Yet after quitting work for a long time, air dryer can expend a certain amount of time so that its cold-producing medium is returned the running temperature that is chilled to its optimization and remove moisture and pollutant effectively from compressed air.In the time period of the cold-producing medium that cools off air dryer, a certain amount of air that feeds to air system can be dried to desired level.
A kind of structure of the present invention provides the fluid compression system that comprises compressor, refrigeration drier, sensor and controller.Compressor has produced flow of compressed fluid, and this flow of compressed fluid is for containing the air of steam or other fluid (for example lubricant) in preferable configuration.After compressed air leaves compressor because of existing steam to think that this compressed air is humid air.Be separated into second flow of compressed fluid (dry air) and fluid stream (water) by refrigeration drier cooling humid air and with it then.Water is got rid of from system and dry air is delivered to the use point, and this use point can be reservoir vessel, pneumatic hammer etc.Sensor is positioned to characteristic, controller in order to measuring system and starts and stop compressor and refrigeration drier response sensor measured characteristic at least in part.In this preferable configuration, refrigeration drier prior to compressor start so that there is not humid air to be directed to the use point.
In the another kind structure, the invention provides the fluid compression system that comprises compressor and refrigeration drier, this compressor can be used to produce first flow of compressed fluid, and this refrigeration drier is connected on the compressor and can be used to that first flow of compressed fluid is separated into second flow of compressed fluid and liquid flows.First sensor is positioned in order to measuring the characteristic of second flow of compressed fluid, and controller can be used to the very first time and at least in part response institute survey characteristic and start the operation of refrigeration drier, and in the operation of second time startup compressor.The very first time is before second time.
In the another kind structure, the invention provides the method for operation fluid compressibility.This method comprises first parameter of measuring compressed fluid, responds first measurement parameter at least in part and starts refrigeration drier, and measure second parameter after starting refrigeration drier system.This method also comprises and responds second parameter at least in part and starting compressor.
In another structure, the invention provides operation to using point to carry the fluid compression system of compressed fluid.This method is included in uses point to measure the characteristic of compressed fluid by first sensor, and response institute surveys characteristic and the operation of starting refrigeration drier at least in part, and the operation that starts compressor after the operation of startup refrigeration drier.Compressor can be used to produce first flow of compressed fluid.This method also comprises the flow of compressed fluid refrigeration drier that leads, by using refrigeration drier that first flow of compressed fluid is separated into second flow of compressed fluid and liquid stream, and at least in part response survey characteristic and stop the operation of compressor and refrigeration drier.
By considering to describe in detail and will be appreciated that in conjunction with the accompanying drawings others of the present invention.
Description of drawings
Fig. 1 is the schematic diagram according to fluid compression system of the present invention;
Fig. 2 is according to the run duration pressure of the fluid compression system of a kind of structure of the present invention curve map to the time;
Fig. 3 is the flow chart that shows a part first control scheme;
Fig. 4 is the flow chart that shows a part second control scheme;
Fig. 5 is the flow chart that shows the part control scheme of the first control scheme of following or the second control scheme;
Fig. 6 is the flow chart that shows the alternative control scheme of a part of the first control scheme of following or the second control scheme.
Before in detail explaining the arbitrary structure of the present invention, should be understood that the present invention is not limited to it and is applied in following explanation listed or shown structure detail of the following drawings and the arrangements of components.The present invention can be used in other formation and can adopt the whole bag of tricks to carry out or enforcement.Equally, it should be understood that employed word of this paper and term are should regard restriction as for illustrative purposes and not.
The specific embodiment
Fig. 1 shows a kind of of fluid compression system 10 and may arrange, this fluid compression system 10 comprises that acting in conjunction provides the compressor 14 and the refrigeration drier 18 of dry compressed fluid or gas to system or use point (point of use) 22.In preferable configuration, use point 22 to comprise container (tank), reservoir (reservoir) etc.Yet in constructive alternative, use point 22 can comprise one or more injection molding machines, pneumatic equipment, pneumatic tool, pneumatic actuator, air control unit etc.In addition, although considered other fluid or gas, this fluid or gas are preferably air.
The refrigeration drier 18 of Fig. 1 comprises coolant compressor 26, evaporimeter 30, expansion gear 34 and the condenser of arranging in the kind of refrigeration cycle mode that is similar to standard 38.Coolant compressor 26 can comprise and is suitable for compressed refrigerant so that generate one or more compression sets of cold-producing medium stream.For example, one or more rotary screw formula compressors and/or one or more scroll compressor can be used as coolant compressor 26.Certainly, herein the compressor of unshowned other type or compressor combination if also can be used as coolant compressor 26 when needing.
Thereby system 18 has generated the cooling refrigeration agent stream of process evaporimeter 30 with the kind of refrigeration cycle operation of standard.Flow through evaporimeter 30 and pass through cold-producing medium and cool off by air compressor 26 compressed and supplied air.The condensation and by using liquid-gas separation device 46 from compressed air, to separate and removing in air stream of steam in the compressed air.This processing has generated dry compressed air stream and liquid stream.Although have multiple liquid gas separating system, preferably depend on liquids and gases and separate with different machinery on the inertia, for example whirlwind separator in quality.Certainly, also can be and use other separator such as the coagulation type filter in conjunction with mechanical separation device or alternative mechanical separation device.
Air passes through heat exchanger (recuperator) 50 then, and in this heat exchanger 50, air is heated a little so that leave the airflow temperature of air outlet slit 54 is higher than its dew point.Heat exchanger 50 comprises the heat exchanger of compressed air stream that receives heat from compressor 14 and the compressed air stream of discharging cooling in advance.Heat exchanger also receive the dried compressed air stream of cooling and to its heating so that the temperature of the dry air of discharging enough is higher than its dew point, thereby reduced the possibility of extra condensation in the use.Therefore, heat exchanger 50 is introduced air by cooling in advance and has been reduced load on the evaporimeter 30, thereby allows less evaporimeter 30 and/or refrigeration drier 18.Will be understood that as a member among those of ordinary skills, can adopt multiple different heat exchanger to arrange in the heat exchanger 50, comprise fin tube type heat exchanger, shell-and-tube exchanger, plate fin type heat exchanger and micropassage type heat exchanger etc.
Will be understood that as a member among those of ordinary skills other parts or the system that adopt usually in the refrigeration system also can be used in the current layout.For example, vessel can be positioned in the circulation in order to the cold-producing medium of collecting surplus and the effect of playing reservoir.In addition, check-valves, sensor and control device are if can be positioned on the various points of refrigeration drier 18 when needing.
Fig. 2 diagram shows the operation of a kind of system structure of Fig. 1.Controller 60 monitoring fluid compressibilities 10 are so that determine when starting or stop compressor 14.Controller 60 is also controlled the operation of refrigeration drier 18.In preferable configuration, controller 60 has adopted the basis control scheme that allowed starting refrigeration drier 18 before starting compressor 14.In the control scheme of basis each all comprises be used for any several modification of basic control scheme required in application-specific.
A kind of basic control scheme (partly being shown among Fig. 3) adopts controller 60 to come by sensor 58 monitoring fluid compressibilities 10, so that determine when the operation that starts compressor 14.Sensor 58 can be the sensor that is suitable for gaging pressure, pressure change rate, temperature, time or other characteristic, and can be positioned on the upstream of using point 22 or near, for example in reservoir or container.In preferable configuration, sensor 58 is a pressure sensor.When detecting pressure in the fluid compression system 10, sensor 58 reduces to predetermined threshold levels when following, starting refrigeration drier 18.For example, the expectation supply is in 100 pounds/square inch (psi) (0.69MPa) to the compressed air between 120 pounds/square inch (0.83MPa) in a kind of system.In this system, when gaging pressure is reduced to the operation that 105 pounds/square inch (0.72MPa) can start refrigeration drier 18 when following.So refrigeration drier 18 will be during operation before compressor 14 starting operations and running through continuous service the whole service of compressor 14.Based on the starting pressure of specific system adjustable restraining cool-drying device 18, reach temperature required during once the starting operation in that compressor 14 is firm so that guarantee cold-producing medium.Sensor 58 is measured the air pressure of using point 22 places usually.Yet,, can measure air pressure in intrasystem one or more positions by using one or more sensors 58.In addition, these one or more sensors 58 can be measured the characteristic and the property combination of any number, for example time and pressure change rate.
Before operation compressor 14, can start the operation of refrigeration drier 18 with the certain pressure that allows refrigerant cools special time amount.In alternative arrangement, refrigeration drier 18 operation special time amounts are so that allowed cold-producing medium to reach specified temp before starting compressor 14 operations.Therefore, timer 62 is used in the starting of following drier 18 through starting compressor 14 after the predetermined amount of time.This layout has guaranteed that cold-producing medium reaches temperature required and reduces the amount and need not to move compressor 14 running time of refrigeration drier 18.In other structure, second gaging pressure is used for starting compressor 14.These the structure in, if compressor 14 at the fixed time the section in off-duty, then timer 62 can be used for closing drier 18.Therefore, drier 18 will move, and reduce to below second predetermined pressure up to pressure, and compressor 14 starts when this second predetermined pressure point.In other structure that still has, temperature in the temperature sensor measurement drier 18 and starting compressor 14 when measured temperature reaches temperature required.
The first control scheme can same compressor 14 or a plurality of compressor use together.Controller 60 can be by the fluid pressure in the sensor 58 monitoring compressibilities 10 and running refrigerating drier 18 and compressor 14 as required.In another alternative arrangement, the refrigeration drier 18 specific time quantums of operation are not so that refrigeration drier 18 stops after will measuring at the fixed time if compressor 14 starts then.This layout has guaranteed that the operation of refrigeration drier 18 is no longer than the essential requirement of the compressor 14 of defined.
Another basic control scheme (partly being shown among Fig. 4) adopts the one or more measurement point monitoring air pressure variations rates of controller 60 in fluid compression system 10.Air pressure can be measured by in fact being arranged in fluid compression system 10 sensor 58 Anywhere, and is preferably using point 22 places to measure.Air pressure that controller 60 uses are measured and air pressure variations rate will be so that when prediction will need to move compressor 14 for extra compressed air.By using example mentioned above, if refrigeration drier 18 needs refrigerant cools to desired level five minutes and fluid compression system 10 in institute's measuring pressure rate of change be 1psi (0.007MPa)/minute, then controller 60 will start refrigeration drier 18 when institute's measuring pressure is higher than required minimum pressure 5psi (0.034MPa).
Just as with other control scheme as herein described, refrigeration drier 18 is operation constantly before pressure reaches the level that compressor 14 brings into operation.Drier 18 and compressor 14 preferably move till compressor 14 stops then.In constructive alternative, such starting that refrigeration drier 18 can be as described.Yet except starting refrigeration drier 18, timer 62 can start and control the starting of compressor 14, the preset time so that compressor 14 brings into operation after starting refrigeration drier 14.In other structure that still has, the temperature in the temperature sensor measurement drier 18 also starts the operation of compressor 14 when temperature reaches desirable value.
In some constructions, the temperature in second sensor monitoring refrigeration drier 18.For example, second sensor can be measured in the refrigeration drier 18 Anywhere for example temperature in coolant compressor 26 downstreams, perhaps can measure the temperature in the evaporimeter 30.This second measurement characteristics can be used to calculate the time quantum that refrigeration drier 18 need reach required running temperature.The time of this calculating can be used to change the pressure of refrigeration drier 18 starting operations.Adopt this kind measurement can use any control scheme as herein described.
Fig. 3 to Fig. 6 shows the part in some control schemes that this paper discusses.Certainly, many different modification is possible and can be suitable for using.For example, a kind of alternative combines the temperature survey of obtaining in the self-control cool-drying device 18, and this temperature survey is used in computing subsequently so that change the starting pressure of refrigeration drier 18.Therefore, when refrigeration drier 18 was warmmer, it will move the long period, so that reached required cooling level before starting compressor 14.
Refrigeration drier 18 cooled off before the operation of compressor 14 at the amount permission extra time of operation before the starting compressor 14 evaporimeter 30, made air just dry effectively when compressor 14 begins to start.This has been avoided the dew point spike (spike) of system air.In each control scheme, compressor 14 is in operation and does not postpone, but starts 18 scheduled times of refrigeration drier amount before needs compressor 14.
In some constructions, refrigeration drier 18 is independent of compressor 14 and is controlled, so that whether tube compressor 14 does not move, the 18 operation scheduled time of refrigeration drier amount also stops automatically.
In service, and as shown in Figure 3, a kind of systematic survey pressure (square frame 300).Preferably, use the some place or near gaging pressure.Institute's measuring pressure is then with first scheduled pressure value or drier starting pressure compare (square frame 305).If pressure is not less than the drier starting pressure, then measure again and new gaging pressure is compared with first predetermined pressure.If institute's measuring pressure is lower than first predetermined pressure, then control is started drier (square frame 310) and is transferred to Fig. 5 or step shown in Figure 6.
With reference to Fig. 5, be controlled at the starting drier and start timer 62 (square frame 315) and continue gaging pressure (square frame 320) afterwards.Institute's measuring pressure is with second predetermined value or compressor start value compare (square frame 325).In addition, the value of timer 62 is with the scheduled time limit compare (square frame 330).If timer 62 reached the scheduled time limit before pressure reaches second predetermined value, then stop drier (square frame 335).Yet, if pressure was reduced to below second predetermined pressure starting compressor (square frame 340) before timer 62 reaches the scheduled time limit.Gaging pressure and it is stopped pressure comparing (square frame 345 and square frame 350) with the 3rd predetermined pressure or compressor then.When pressure reaches the 3rd predetermined pressure, stop drier and compressor (square frame 355) and Fig. 3 state is got back in control.
In some constructions, timer 62 is used for starting compressor but not is used to stop drier.In this structure shown in Figure 6, monitoring timer 62 (square frame 330) is till it reaches the scheduled time, at this predetermined point of time starting compressor (square frame 340).In yet another embodiment, cancel timer 62 and pressure and be used for starting compressor.In this structure, monitor force reaches the 3rd predetermined pressure until it, at this pressure spot starting compressor (square frame 340).In another embodiment, measure the temperature of drier and non-pressure.In this structure, when measured temperature is reduced to predetermined temperature starting compressor (square frame 340) when following.Therefore, the square frame 315 of Fig. 6 and square frame 330 is if can adopt temperature survey when needing and comparison block or pressure measxurement and comparison block replace.
In the another kind structure, the system that the control system monitoring is shown in Figure 4.In this structure, control system is measured initial pressure (square frame 300), measures the packing pressure (square frame 360) behind the certain hour then.Being used for like that shown in square frame 365 determined pressure change rate to two kinds of pressure being surveyed then.Then rate of change and last gaging pressure are provided in the computing so that when estimation will need starting compressor and drier (square frame 370).If computing is determined to start drier (square frame 375), then control transitions to Fig. 5 or step shown in Figure 6.If computing does not require the starting drier, then measure new pressure and this process is proceeded.
It should be noted that some structures are also monitored the temperature of drier, reach required running temperature and how long will need operation so that be estimated as.In these structures, drier can start early or late according to its temperature.The calculating of square frame 370 can solve this input.
It should be noted that term " dry air " is used to describe the air that has passed through refrigeration drier 18 herein.Yet, will be understood that as a member among those of ordinary skills dry air is not have water or steam fully.And should be that dry air is to have removed a part of moisture so that reduce moisture extra possible air of condensation in compressed air in the use.
Therefore, the present invention provides to system in addition or has used the drying fluid of some transmission compression or the fluid compression system of gas.Various feature and advantage of the present invention have been listed in the claims.
Claims (23)
1. fluid compression system comprises:
Can be used to produce the compressor of first flow of compressed fluid;
Be connected on the described compressor and can be used to described first flow of compressed fluid is separated into the refrigeration drier of second flow of compressed fluid and liquid stream;
Be positioned to first sensor in order to the characteristic of measuring described second flow of compressed fluid; With
Controller, described controller can be used in the very first time and respond measured characteristic at least in part and start the operation of described refrigeration drier, and start the operation of described compressor in second time, and wherein, the described very first time is before described second time.
2. fluid compression system according to claim 1 is characterized in that, described sensor comprises that pressure sensor and measured characteristic comprise pressure.
3. fluid compression system according to claim 1 is characterized in that described first flow of compressed fluid comprises the mixture of steam of the air and first quantity.
4. fluid compression system according to claim 3 is characterized in that described second flow of compressed fluid comprises the steam of the air and second quantity, and the steam of described second quantity is less than the steam of described first quantity.
5. fluid compression system according to claim 4 is characterized in that, described liquid stream comprises the condensed steam of removing from the steam of described first quantity.
6. fluid compression system according to claim 1 is characterized in that, described controller can be used to respond measured characteristic at least in part and described refrigeration drier and described compressor are stopped.
7. fluid compression system according to claim 1 is characterized in that, described controller can be used to respond at least in part the time of the pre-fixed length of process after the described very first time and starts described compressor.
8. fluid compression system according to claim 1 is characterized in that, described controller can be used to cause greatly described refrigeration drier and described compressor to stop simultaneously.
9. fluid compression system according to claim 1 is characterized in that, measured characteristic is a pressure change rate.
10. the method for an operation fluid compressibility, described method comprises:
Measure first parameter of compressed fluid;
Respond described first measurement parameter at least in part and start the refrigeration drier system;
After the described refrigeration drier of starting system, measure second parameter; With
Respond described second parameter at least in part and starting compressor.
11. method according to claim 10 is characterized in that, described first parameter is a pressure.
12. method according to claim 11 is characterized in that, described second parameter is a pressure.
13. method according to claim 11 is characterized in that, described second parameter is a temperature.
14. method according to claim 10 is characterized in that, described first parameter is a pressure change rate.
15. method according to claim 10 is characterized in that, described second parameter is institute's elapsed time after the described refrigeration drier of the starting system.
16. method according to claim 10 is characterized in that, described second parameter is identical with described first parameter.
17. an operation is to the method for using point to carry the fluid compression system of compressed fluid, described method comprises:
By the characteristic of first sensor at the described compressed fluid of described use point measurement;
Respond measured characteristic at least in part and start the operation of refrigeration drier;
Start the operation of compressor after the operation that starts described refrigeration drier, described compressor can be used to produce first flow of compressed fluid;
With the described first flow of compressed fluid described refrigeration drier that leads;
By using described refrigeration drier that described first flow of compressed fluid is separated into second flow of compressed fluid and liquid stream; With
Respond measured characteristic at least in part and described compressor out of service and described refrigeration drier.
18. the method for the described fluid compression system of operation according to claim 17 is characterized in that, described characteristic is a pressure.
19. the method for the described fluid compression system of operation according to claim 17 is characterized in that, described characteristic is a pressure change rate.
20. the method for the described fluid compression system of operation according to claim 17 is characterized in that, described method comprises also that monitoring starts behind the described drier institute's elapsed time and through starting the operation of described compressor behind the predetermined amount of time.
21. the method according to the described fluid compression system of operation of claim 17 is characterized in that, the described method that stops compressor and refrigeration drier comprises and roughly side by side stops described compressor and described refrigeration drier.
22. the method for the described fluid compression system of operation according to claim 17 is characterized in that, described method also comprises the temperature of measuring described refrigeration drier and responds described measurement temperature at least in part and start described compressor.
23. the method for the described fluid compression system of operation according to claim 17 is characterized in that, described method also comprises and remeasures described characteristic and the characteristic that remeasured of response and start described compressor at least in part.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US88130707P | 2007-01-19 | 2007-01-19 | |
| US60/881307 | 2007-01-19 | ||
| US11/934104 | 2007-11-02 |
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| Publication Number | Publication Date |
|---|---|
| CN101226024A true CN101226024A (en) | 2008-07-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100014422A Pending CN101226024A (en) | 2007-01-19 | 2008-01-18 | Pre-emptive air dryer control in a compressed air system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103765140A (en) * | 2011-04-01 | 2014-04-30 | 英格索尔兰德公司 | Heat exchanger for a refrigerated air dryer |
| CN106604770A (en) * | 2014-09-04 | 2017-04-26 | 克诺尔商用车制动系统有限公司 | Method and system for regenerating a compressed air system |
| CN112930505A (en) * | 2018-12-04 | 2021-06-08 | 天普桑尼克公司 | Test point temperature control system and method |
-
2008
- 2008-01-18 CN CNA2008100014422A patent/CN101226024A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103765140A (en) * | 2011-04-01 | 2014-04-30 | 英格索尔兰德公司 | Heat exchanger for a refrigerated air dryer |
| CN103765140B (en) * | 2011-04-01 | 2015-11-25 | 英格索尔兰德公司 | For the heat exchanger of cooling air drier |
| CN106604770A (en) * | 2014-09-04 | 2017-04-26 | 克诺尔商用车制动系统有限公司 | Method and system for regenerating a compressed air system |
| CN112930505A (en) * | 2018-12-04 | 2021-06-08 | 天普桑尼克公司 | Test point temperature control system and method |
| CN112930505B (en) * | 2018-12-04 | 2022-11-18 | 天普桑尼克公司 | Test point temperature control system and method |
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Open date: 20080723 |