CN101275565A - Method for ensuring stepless adjustment screw rod air-conditioning unit to normally start up - Google Patents
Method for ensuring stepless adjustment screw rod air-conditioning unit to normally start up Download PDFInfo
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- CN101275565A CN101275565A CNA2007100866911A CN200710086691A CN101275565A CN 101275565 A CN101275565 A CN 101275565A CN A2007100866911 A CNA2007100866911 A CN A2007100866911A CN 200710086691 A CN200710086691 A CN 200710086691A CN 101275565 A CN101275565 A CN 101275565A
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- unloading
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Abstract
The invention discloses a method for ensuring the normal startup of a screw air-conditioning unit, comprising the following steps: receiving a shutdown instruction when a compressor operates normally; opening an unloading valve and closing a loading valve, when the compressor goes on operating; shutting down the compressor after a first preset time; and closing the unloading valve. Compared with the prior art, the method realizes unloading by increasing a special unloading process, and reaches the unloading effect for the normal startup of the compressor, without any detecting elements, thus lowering the cost. In the further optimized scheme of the invention, after the compressor is shut down, the unloading valve is not closed immediately, and kept opening for a second preset time. In this state, since the unloading valve is opened continuously, a capacity adjusting valve goes on moving under the action of a spring, unloading can be realized continuously, and then the normal startup of the compressor is ensured, avoiding the damage to the compressor.
Description
Technical field
The present invention relates to air-conditioning technical, particularly relate to a kind of method of guaranteeing stepless adjustment screw rod air-conditioning unit to normally start up.
Background technique
What step-less adjustment water-cooling screw rod air-conditioning unit used is a kind of stepless capacity transfer amount regulating type helical-lobe compressor, in theory, the capacity of this helical-lobe compressor can be realized the continuous adjusting of 0-100%, (in fact the scope that can regulate continuously is at 25%-100%), because it can realize the continuous adjusting of capacity, from energy-conservation angle, can realize the effect of frequency-changeable compressor in theory.Therefore, this compressor obtains using on large-scale central air-conditioner gradually.
The capacity control device of step-less adjustment water-cooling screw rod air-conditioning unit realizes that by two valves one is to upload valve, and one is feather valve, and is outside by the control to these two valves, realizes capacity regulating.The size of capacity has determined the discharge capacity in the refrigerant unit time, and capacity is big more, and the discharge capacity of refrigerant is big more, and refrigerating capacity is also just big more.
But, when helical-lobe compressor starts, require under less load, to start, if it is excessive to start load, helical-lobe compressor will be difficult to smooth startup, and may cause the tripping of circuit safety device owing to produce big input current; Simultaneously,, also can damage the motor of helical-lobe compressor, shorten the working life of compressor owing to the start-up course difficulty.Compressor capacity and load are closely related, and capacity is big more, and it is big more to load.Therefore, helical-lobe compressor can not start under jumbo situation.This just need at first finish the unloading to compressor capacity before startup.
At present, compressor capacity is unloaded main employing electric current testing.The uninstall process of this kind method is as follows: when needs are shut down; open feather valve by compressor unloading, detect the electric current of air compressor motor simultaneously, when this electric current during less than a certain predetermined value; judge that compressor has unloaded the capacity that reaches required, stop compressor operation.The concrete data of above-mentioned electric current predetermined value can be determined according to the requirement in the specifications of compressor.This controlling party ratio juris is, after compressor capacity reduced, its running load also can reduce, and the air compressor motor running current is reduced, therefore, and can be with this current value as judging whether compressor unloading reach the required standards.The shortcoming of this method is that needing increases current detection module, and increase is controlled cost.
Summary of the invention
At above-mentioned defective, the technical problem that the present invention solves is, a kind of method of guaranteeing stepless adjustment screw rod air-conditioning unit to normally start up is provided.This method can be guaranteed the compressor normal boot-strap, and need not to increase Detecting element for this reason.
Method provided by the invention comprises a kind of method of guaranteeing screw rod air-conditioning unit to normally start up, comprising:
When compressor normally moves, receive shutdown command;
Compressor remains in operation, and opens feather valve simultaneously, closes and uploads valve;
After waiting for for one first scheduled time, close compressor;
Close feather valve.
Preferably, described first scheduled time is determined at concrete compressor test.
Preferably, the value of described first scheduled time was at 3-5 minute.
Preferably, after close compressor, keep feather valve to open and continued for one second scheduled time; Second scheduled time was closed feather valve after arriving again.
Preferably, described first scheduled time is determined at concrete compressor test.
Preferably, the value of described first scheduled time was at 3-5 minute.
Preferably, the value of described second scheduled time is no more than interval working time that compressor requires.
Preferably, when described compressor started once more, when compressor was started shooting once more, feather valve and upload valve and open simultaneously kept this state to reach for one the 3rd scheduled time, enters normal operating condition then.
Preferably, the value of described the 3rd scheduled time is 10-30 second.
Compared with prior art, method provided by the invention realizes unloading by increasing special-purpose uninstall process, need not to increase any Detecting element, just can reach the unloading effect that makes the compressor normal boot-strap, and therefore, the present invention can reduce cost than prior art.
In further preferred version of the present invention, further make compressor shutdown after, do not close feather valve at once, but keep the feather valve opening state to continue for one second scheduled time.Under this kind state, because feather valve continues to open, hold and transfer valve under spring action, continue motion, can continue to realize unloading, further guarantee the normal startup of compressor.This process has prolonged the compressor unloading time, simultaneously, compressor is unlikely under the excessive state of unloading moves, and has avoided compressor damage.
In further preferred version of the present invention, on the basis of above preferred version, when compressor is started shooting once more, make feather valve and upload valve and open simultaneously, and keep this state to reach for one the 3rd scheduled time.This feather valve and upload the transition state that valve is opened simultaneously can not meet the requirements of under the situation in unloading, and load is unlikely excessive when making compressor start, and inrush current maintains reduced levels, avoids problems such as tripping operation.
Use such scheme provided by the invention, can under the situation that does not increase any Detecting element, guarantee the normal startup of compressor, realize the better economic effect.
Description of drawings
Fig. 1 is the flow chart of first embodiment of the invention;
Fig. 2 is the flow chart of second embodiment of the invention;
Fig. 3 is the flow chart of third embodiment of the invention.
Embodiment
Please referring to Fig. 1, this illustrates the flow chart of first embodiment of the invention.This embodiment provides a kind of method of opening the feather valve unloading before the compressor shutdown.
When step S101, compressor normally move, receive shutdown command.
Step S102, compressor remains in operation, and opens feather valve simultaneously, closes and uploads valve.
Because compressor continues operation, therefore, refrigerant is normally discharged.Simultaneously, feather valve is opened, and uploads valve and closes, and refrigerant stream is gone out from feather valve, and at this moment, the appearance in the compressor transfers valve because the reduction of compressor internal pressure is moved under the promotion of spring, and the reduction of compressor capacity is realized in the space of having reduced compressor.
Step S103, waited for for one first scheduled time after, close compressor.Close feather valve simultaneously.
The length of above-mentioned first scheduled time need make compressor unloading be able to the normal requirement that starts.Be generally 3-5 minute, the concrete time also can adopt test method to obtain at concrete compressor.
Through above-mentioned steps, generally can realize unloading to the screw rod air-conditioning, still, still have problems.Because the unloading of compressor is to promote Rong Tiaofa by spring under the condition that feather valve is opened, and reduces the compressor space, thereby the capacity of realizing compressor is adjustable.In other words, want compressor and drop to lower load and stop, it is fixing holding the distance of transferring valve to move.But owing to increase service time, the coefficient of stiffiness that the spring of transferring valve is held in the frictional force of appearance accent valve and compression chamber wall and promotion all can change.Therefore, under this condition,, in the original time, possibly can't unload the requirement that reaches normal startup along with the air-conditioning unit lengthening of service time.For this reason, may need to prolong unloading time, still, if the time of using this prolongation as unloading time, is then holding under the normal situation of accent valve state, unloading time can be long, because the motor of compressor is in operation process, can produce heat, this caloric requirement is taken away by the refrigerant of flowing through, when cold medium flux is not enough, if motor turns round for a long time, can cause motor overheated, light then shorten working life of compressor motor, when serious even can burn out motor.
In order to solve the problem that above-mentioned first embodiment exists, the present invention further proposes second embodiment, and this embodiment can guarantee further that unloading reaches requirement, can not produce injury to compressor simultaneously.
Please referring to Fig. 2.This figure is second embodiment's a flow chart.
When step S201, compressor normally move, receive shutdown command.
Step S202, compressor remains in operation, and opens feather valve simultaneously, closes and uploads valve.
Under this state, because compressor continues operation, and uploads valve and close, feather valve is opened, and the capacity of compressor is along with compressor operating progressively reduces.
Step S203, waited for for one first scheduled time after, close compressor keeps feather valve to open simultaneously.
Preferred 3～5min of described first scheduled time if overlong time will make the unit unloading excessively, causes the compressor cooling insufficient, shortens the working life of press; If the time is too short, then may not reach the effect of unloading.The length of concrete time can be determined by the test at concrete compressor.
Step S204 keeps the feather valve opening state to continue for one second scheduled time.
Under this kind state, because feather valve continues to open, hold and transfer valve under spring action, continue motion, realize unloading.But this second scheduled time should not surpass interval working time of this air-conditioning unit, in order to avoid influence the proper functioning of air-conditioning unit.This process has prolonged the compressor unloading time, simultaneously, compressor is unlikely under the excessive state of unloading moves.
Step S205, second scheduled time arrived, and closed feather valve.
The method that above-mentioned second embodiment provides can guarantee comparatively fully that compressor unloading reaches requirement, and can not produce the insufficient problem of cooling that compressor unloading excessively causes.
But above-mentioned second embodiment's method can not guarantee that still unloading degree is issued to the requirement of normal boot-strap at any extreme case, for this reason, below the 3rd embodiment a kind of further perfect scheme is provided.
When step S301, compressor normally move, receive shutdown command.
Step S302, compressor remains in operation, and opens feather valve simultaneously, closes and uploads valve.
Under this state, because compressor continues operation, and uploads valve and close, feather valve is opened, and the capacity of compressor is along with compressor operating progressively reduces.
Step S303, waited for for one first scheduled time after, close compressor keeps feather valve to open simultaneously.
Preferred 3～5min of described first scheduled time if overlong time will make the unit unloading excessively, causes the compressor cooling insufficient, shortens the working life of press; If the time is too short, then may not reach the effect of unloading.The length of concrete time can be determined by the test at concrete compressor.
Step S304 keeps the feather valve opening state to continue for one second scheduled time.
Under this kind state, because feather valve continues to open, hold and transfer valve under spring action, continue motion, realize unloading.But this second scheduled time should not surpass interval working time of this air-conditioning unit, in order to avoid influence the proper functioning of air-conditioning unit.This process has prolonged the compressor unloading time, simultaneously, compressor is unlikely under the excessive state of unloading moves.
Step S305, second scheduled time arrived, and closed feather valve.
When step S306, compressor start shooting once more, feather valve and upload valve and open simultaneously.Keep this state to reach for one the 3rd scheduled time.
Because feather valve and upload valve and open simultaneously can not meet the requirements of under the situation in unloading, load is unlikely excessive when making compressor start, and inrush current maintains reduced levels, avoids tripping operation.
Step S307, described the 3rd scheduled time arrives, and closes feather valve, enters normal working.
The 3rd scheduled time was generally 10-30 second, and this time can be determined according to test at the compressor of different model, its objective is that electric current is unlikely excessive when making compressor start.
The method that above-mentioned the 3rd embodiment provides because on the basis of the method that second embodiment provides, has increased and has uploaded the transient process that valve and feather valve are opened simultaneously when starting shooting once more, can guarantee that the compressor normal boot-strap starts.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1. a method of guaranteeing screw rod air-conditioning unit to normally start up is characterized in that, comprising:
When compressor normally moves, receive shutdown command;
Compressor remains in operation, and opens feather valve simultaneously, closes and uploads valve;
After waiting for for one first scheduled time, close compressor;
Close feather valve.
2. method according to claim 1 is characterized in that, described first scheduled time is determined at concrete compressor test.
3. method according to claim 1 is characterized in that the value of described first scheduled time was at 3-5 minute.
4. method according to claim 1 is characterized in that, after close compressor, keeps feather valve to open and continues for one second scheduled time; Second scheduled time was closed feather valve after arriving again.
5. method according to claim 4 is characterized in that, described first scheduled time is determined at concrete compressor test.
6. method according to claim 4 is characterized in that the value of described first scheduled time was at 3-5 minute.
7. method according to claim 4 is characterized in that, the value of described second scheduled time is no more than interval working time that compressor requires.
8. according to each described method of claim 4-7, it is characterized in that when described compressor started once more, when compressor was started shooting once more, feather valve and upload valve and open simultaneously kept this state to reach for one the 3rd scheduled time, enters normal operating condition then.
9. method according to claim 8 is characterized in that, the value of described the 3rd scheduled time is 10-30 second.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100866911A CN101275565A (en) | 2007-03-30 | 2007-03-30 | Method for ensuring stepless adjustment screw rod air-conditioning unit to normally start up |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007100866911A CN101275565A (en) | 2007-03-30 | 2007-03-30 | Method for ensuring stepless adjustment screw rod air-conditioning unit to normally start up |
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| CN101275565A true CN101275565A (en) | 2008-10-01 |
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| CNA2007100866911A Pending CN101275565A (en) | 2007-03-30 | 2007-03-30 | Method for ensuring stepless adjustment screw rod air-conditioning unit to normally start up |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102193567A (en) * | 2010-03-10 | 2011-09-21 | 同方人工环境有限公司 | Method for controlling stepless adjustment of water-source screw unit |
| CN102192574A (en) * | 2011-05-25 | 2011-09-21 | 宁波奥克斯电气有限公司 | Cooling mode start-up control method for screw-compression multi-connected central air conditioner |
| CN102261719A (en) * | 2011-05-25 | 2011-11-30 | 宁波奥克斯电气有限公司 | Control method for starting heating mode of screw-type compressed multi-connected central air conditioner |
| CN102401513A (en) * | 2011-09-16 | 2012-04-04 | 宁波奥克斯电气有限公司 | Ice storage and cold release control method of combined-type screw ice storage air-conditioner |
| CN105485981A (en) * | 2015-12-23 | 2016-04-13 | 宁波奥克斯电气股份有限公司 | Parallel type double-valve throttling device and control method |
| CN107345514A (en) * | 2016-05-06 | 2017-11-14 | 中国石油化工股份有限公司 | A kind of compressor boot system and method |
-
2007
- 2007-03-30 CN CNA2007100866911A patent/CN101275565A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102193567A (en) * | 2010-03-10 | 2011-09-21 | 同方人工环境有限公司 | Method for controlling stepless adjustment of water-source screw unit |
| CN102193567B (en) * | 2010-03-10 | 2013-11-13 | 同方人工环境有限公司 | Method for controlling stepless adjustment of water-source screw unit |
| CN102192574A (en) * | 2011-05-25 | 2011-09-21 | 宁波奥克斯电气有限公司 | Cooling mode start-up control method for screw-compression multi-connected central air conditioner |
| CN102261719A (en) * | 2011-05-25 | 2011-11-30 | 宁波奥克斯电气有限公司 | Control method for starting heating mode of screw-type compressed multi-connected central air conditioner |
| CN102192574B (en) * | 2011-05-25 | 2013-03-06 | 宁波奥克斯电气有限公司 | Cooling mode start-up control method for screw-compression multi-connected central air conditioner |
| CN102261719B (en) * | 2011-05-25 | 2013-06-05 | 宁波奥克斯电气有限公司 | Control method for starting heating mode of screw-type compressed multi-connected central air conditioner |
| CN102401513A (en) * | 2011-09-16 | 2012-04-04 | 宁波奥克斯电气有限公司 | Ice storage and cold release control method of combined-type screw ice storage air-conditioner |
| CN105485981A (en) * | 2015-12-23 | 2016-04-13 | 宁波奥克斯电气股份有限公司 | Parallel type double-valve throttling device and control method |
| CN107345514A (en) * | 2016-05-06 | 2017-11-14 | 中国石油化工股份有限公司 | A kind of compressor boot system and method |
| CN107345514B (en) * | 2016-05-06 | 2020-02-07 | 中国石油化工股份有限公司 | Compressor starting system and method |
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Open date: 20081001 |