CN110455022A - A method of it improving COP and increases cold water main unit capability control range - Google Patents
A method of it improving COP and increases cold water main unit capability control range Download PDFInfo
- Publication number
- CN110455022A CN110455022A CN201910745531.6A CN201910745531A CN110455022A CN 110455022 A CN110455022 A CN 110455022A CN 201910745531 A CN201910745531 A CN 201910745531A CN 110455022 A CN110455022 A CN 110455022A
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- Prior art keywords
- compressor
- load
- solenoid valve
- frequency converter
- cold water
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a kind of raising COP and increase the method for cold water main unit capability control range, including existing Worm type water-cooled unit, Worm type water-cooled unit includes that compressor, main power source are spaced apart end；Increase frequency converter on Worm type water-cooled unit and solenoid valve is used in the adjusting of compressor valve block；Main power source, which is spaced apart between end and compressor, increases frequency converter；Increase load solenoid valve, off-load solenoid valve, 50% load solenoid valve and the 75% load solenoid valve with the adjusting of valve block position on compressor.The present invention adjusts the load of host by the revolving speed of Frequency Converter Control compressor, can greatly improve utilization rate of the valve block in 100% position of compressor, substantially increase COP when host is run at part load；Master capability, which is adjusted, adjusts combination control using variable frequency adjustment+compressor valve block position, substantially increases the capacity adjustment range of host, host can be made to operate normally under ultra-low load, reduce the start-stop time of host, improve the service life of compressor.
Description
Technical field
The present invention relates to the methods of a kind of raising COP and increase cold water main unit capability control range.
Background technique
Screw-type water chiller is the important refrigeration equipment of industry with installation in civil buildings central air conditioner system.It is existing
Water-cooling screw rod formula water cooler mostly all uses fixed-frequency control, and master capability changes pressure using change compressor valve block position
The output of contracting function power, but compressor, in sub-load, because valve block is under sub-load, the screw rod of helical-lobe compressor only has
Part is in compressed action, therefore compressor efficiency at this time is poor, therefore COP is not in sub-load for screw-type water chiller
It is high；
Because the position of valve block and characteristic determine, if adjusted by valve block, compressor capacity is at most in 50%-
It is adjusted between 100%, if the load of cold water main unit is lower than 50% at this time, screw-type water chiller can be compressed by start and stop
Machine carrys out main unit load, and the increase of start/stop of compressor number will affect the service life of compressor.
Summary of the invention
The technical problem to be solved by the present invention is to a kind of with existing screw-type water chiller, be able to solve the above problem
Increase frequency control to improve COP and increase the method for cold water main unit capability control range.
The present invention is achieved through the following technical solutions: a kind of raising COP and increasing cold water main unit capability control model
The method enclosed, including existing Worm type water-cooled unit, Worm type water-cooled unit include that compressor, main power source are spaced apart end；Spiral shell
Increase frequency converter on rod-type water chiller and solenoid valve is used in the adjusting of compressor valve block；Main power source, which is spaced apart between end and compressor, to be increased
Frequency converter；On compressor increase with the adjusting of valve block position load solenoid valve, off-load solenoid valve, 50% load solenoid valve and
75% load solenoid valve.
Compressor is equipped with compressor screw as a preferred technical solution, and the revolving speed of compressor screw passes through frequency converter
It adjusts；Frequency converter frequency variation drives the variation of compressor screw revolving speed.
The compressor load regulative mode of screw-type water chiller adopts compressor variable frequency adjusting as a preferred technical solution,
Combination is advocates peace with supplemented by compressor uuper valve block solenoid valve.
Compressor is variable frequency starting as a preferred technical solution,.
The beneficial effects of the present invention are:
The present invention adjusts the load of host by the revolving speed of Frequency Converter Control compressor, can greatly improve compressor
Valve block substantially increases COP when host is run at part load in the utilization rate of 100% position.
Meanwhile master capability adjusts and adjusts combination control using variable frequency adjustment+compressor valve block position, substantially increases master
The capacity adjustment range of machine, can be such that host operates normally under ultra-low load, improve the COP of host, while reduce master
The start-stop time of machine improves the service life of compressor.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the structure chart of the compressor valve block position electromagnetic valve for adjusting of screw cold water main unit of the present invention；
Fig. 2 is the circuit diagram before frequency converter of the present invention is transformed in screw-type water chiller；
Fig. 3 is frequency converter of the present invention improved circuit diagram in screw-type water chiller.
Specific embodiment
All features disclosed in this specification or disclosed all methods or in the process the step of, in addition to mutually exclusive
Feature and/or step other than, can combine in any way.
Any feature disclosed in this specification (including any accessory claim, abstract and attached drawing), except non-specifically chatting
It states, can be replaced by other alternative features that are equivalent or have similar purpose.That is, unless specifically stated, each feature is only
It is an example in a series of equivalent or similar characteristics.
In the description of the present invention, it is to be understood that, term " one end ", " other end ", " outside ", "upper", " inside ",
The orientation or positional relationship of the instructions such as "horizontal", " coaxial ", " center ", " end ", " length ", " outer end " is based on shown in attached drawing
Orientation or positional relationship, be merely for convenience of description of the present invention and simplification of the description, rather than the device of indication or suggestion meaning
Or element must have a particular orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In addition, in the description of the present invention, the meaning of " plurality " is at least two, such as two, three etc., unless otherwise
Clear specific restriction.
The term for the representation space relative position such as "upper", " top ", "lower", " lower section " that the present invention uses be for
A unit as shown in the drawings or feature are described relative to another unit or the relationship of feature convenient for the purpose of explanation.
The term of relative space position can be intended to include not Tongfang of the equipment in use or work other than orientation as shown in the figure
Position.For example, being described as being located at the unit of other units or feature " below " or " under " if the equipment in figure overturn
Other units or feature " top " will be located at.Therefore, exemplary term " lower section " can include above and below both orientation.
Equipment can otherwise be directed (be rotated by 90 ° or other directions), and used herein and space correlation is interpreted accordingly
Description language.
In the present invention unless specifically defined or limited otherwise, term " setting ", " socket ", " connection ", " running through ",
Terms such as " grafting " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be with
It is mechanical connection, is also possible to be electrically connected；It can be directly connected, two can also be can be indirectly connected through an intermediary
The interaction relationship of connection or two elements inside a element, unless otherwise restricted clearly.For the common of this field
For technical staff, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
As shown in Figure 1, a kind of method for improving COP and increasing cold water main unit capability control range, including existing screw rod
Formula water chiller, Worm type water-cooled unit include that compressor, main power source are spaced apart end；Increase frequency converter on Worm type water-cooled unit
With compressor valve block adjusting solenoid valve；Main power source, which is spaced apart between end and compressor, increases frequency converter；On compressor increase with
Load solenoid valve, off-load solenoid valve, 50% load solenoid valve and the 75% load solenoid valve of valve block position adjusting.
The valve block position of compressor is controlled by control compressor uuper valve block solenoid valve, and then adjusts the ability of compressor
Output adjusts cold water main unit ability to reach.When off-load solenoid valve obtains electric on compressor, the valve block of compressor in lowest order,
The load output of compressor is minimum at this time, about 50% or so；When load solenoid valve and 50% load solenoid valve on compressor
Must be electric, off-load solenoid valve and 75% load electromagnetism must not be electric, and compressor valve block position is at 50% point, and compressor capacity is defeated at this time
Out about 60% or so；Electric, off-load solenoid valve and 50% negative is obtained when loading solenoid valve and 75% load solenoid valve on compressor
Charged magnetic must not be electric, and compressor valve block position is at 75% point, and compressor capacity output at this time is about 80% or so；Work as compression
Load solenoid valve obtains electric on machine, and off-load solenoid valve, 50% load electromagnetism and 75% load electromagnetism must not be electric, compressor valve block position
At 100% point, compressor capacity fan-out capability is maximum at this time.
Wherein, as shown in Figures 2 and 3, the load of screw-type water chiller can also pass through the screw rod of adjusting compressor
Revolving speed reaches, and the revolving speed of compressor screw can adjust by frequency converter；When frequency converter frequency variation, compressor spiral shell
The revolving speed of bar also and then changes, to realize the stepless variation of compressor capacity, and then reaches screw-type water chiller ability
Step-less adjustment.
The compressor load of screw-type water chiller, which is adjusted, uses compressor uuper valve block solenoid valve+compressor variable frequency adjusting group
The mode of conjunction is adjusted.Adjust principle: variable frequency adjustment is preferential, supplemented by the adjusting of compressor uuper valve block solenoid valve, passes through combination and adjusts
Mode.
Following benefit may be implemented:
1. cooling-water machine machine load can achieve step-less adjustment；
2. it is preferential using frequency conversion, compressor can be made to run in optimum point always, thus when making cold water main unit sub-load
COP highest；
3. improving cold water main unit range of operation；
4. reducing because host start and stop cause the system water temperature come fluctuation
5. reducing the start and stop of compressor, the service life of compressor is improved.
6. compressor is variable frequency starting, reduce starting current, reduction is excessive because invariable frequency compressor starts to rush power grid
It hits.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
The change or replacement expected without creative work, should be covered by the protection scope of the present invention.Therefore, of the invention
Protection scope should be determined by the scope of protection defined in the claims.
Claims (4)
1. a kind of method for improving COP and increasing cold water main unit capability control range, it is characterised in that: including existing screw
Water chiller, Worm type water-cooled unit include that compressor, main power source are spaced apart end；On Worm type water-cooled unit increase frequency converter and
Solenoid valve is used in the adjusting of compressor valve block；Main power source, which is spaced apart between end and compressor, increases frequency converter；Increase use and valve on compressor
Load solenoid valve, off-load solenoid valve, 50% load solenoid valve and the 75% load solenoid valve of block position adjusting.
2. the method according to claim 1 for improving COP and increasing cold water main unit capability control range, it is characterised in that:
Compressor is equipped with compressor screw, and the revolving speed of compressor screw is adjusted by frequency converter；Frequency converter frequency variation drives compression
The variation of machine screw speed.
3. the method according to claim 1 for improving COP and increasing cold water main unit capability control range, it is characterised in that:
The compressor load regulative mode of screw-type water chiller adopts compressor variable frequency and adjusts combination to advocate peace with compressor uuper valve block electricity
Supplemented by magnet valve.
4. the method according to claim 1 for improving COP and increasing cold water main unit capability control range, it is characterised in that:
Compressor is variable frequency starting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910745531.6A CN110455022A (en) | 2019-08-13 | 2019-08-13 | A method of it improving COP and increases cold water main unit capability control range |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910745531.6A CN110455022A (en) | 2019-08-13 | 2019-08-13 | A method of it improving COP and increases cold water main unit capability control range |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110455022A true CN110455022A (en) | 2019-11-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910745531.6A Pending CN110455022A (en) | 2019-08-13 | 2019-08-13 | A method of it improving COP and increases cold water main unit capability control range |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111964318A (en) * | 2020-08-15 | 2020-11-20 | 王咏伦 | Capacity adjusting method of screw unit and system for realizing same |
| CN114440510A (en) * | 2020-11-05 | 2022-05-06 | 复盛实业(上海)有限公司 | Refrigerant unit system and control device and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010045097A1 (en) * | 1995-06-07 | 2001-11-29 | Pham Hung M. | Adaptive control for a refrigeration system using pulse width modulated duty cycle scroll compressor |
| CN204099200U (en) * | 2014-09-23 | 2015-01-14 | 江森自控空调冷冻设备(无锡)有限公司 | The helical-lobe compressor of adjustable interior volume specific ratio |
| CN106523364A (en) * | 2017-01-10 | 2017-03-22 | 麦克维尔空调制冷(苏州)有限公司 | Multi-screw type frequency conversion refrigeration compressor |
| US20180356139A1 (en) * | 2017-06-12 | 2018-12-13 | Trane International Inc. | Compressor control for increased efficiency |
| CN208793232U (en) * | 2018-07-23 | 2019-04-26 | 麦克维尔空调制冷(苏州)有限公司 | The fuel supply flow rate self-regulation sliding valve structure of helical-lobe compressor |
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2019
- 2019-08-13 CN CN201910745531.6A patent/CN110455022A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010045097A1 (en) * | 1995-06-07 | 2001-11-29 | Pham Hung M. | Adaptive control for a refrigeration system using pulse width modulated duty cycle scroll compressor |
| CN204099200U (en) * | 2014-09-23 | 2015-01-14 | 江森自控空调冷冻设备(无锡)有限公司 | The helical-lobe compressor of adjustable interior volume specific ratio |
| CN106523364A (en) * | 2017-01-10 | 2017-03-22 | 麦克维尔空调制冷(苏州)有限公司 | Multi-screw type frequency conversion refrigeration compressor |
| US20180356139A1 (en) * | 2017-06-12 | 2018-12-13 | Trane International Inc. | Compressor control for increased efficiency |
| CN208793232U (en) * | 2018-07-23 | 2019-04-26 | 麦克维尔空调制冷(苏州)有限公司 | The fuel supply flow rate self-regulation sliding valve structure of helical-lobe compressor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111964318A (en) * | 2020-08-15 | 2020-11-20 | 王咏伦 | Capacity adjusting method of screw unit and system for realizing same |
| CN114440510A (en) * | 2020-11-05 | 2022-05-06 | 复盛实业(上海)有限公司 | Refrigerant unit system and control device and control method thereof |
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Application publication date: 20191115 |