CN202630496U - Air-cooled screw type water chiller unit - Google Patents
Air-cooled screw type water chiller unit Download PDFInfo
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- CN202630496U CN202630496U CN 201220258939 CN201220258939U CN202630496U CN 202630496 U CN202630496 U CN 202630496U CN 201220258939 CN201220258939 CN 201220258939 CN 201220258939 U CN201220258939 U CN 201220258939U CN 202630496 U CN202630496 U CN 202630496U
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- blower fan
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Abstract
The utility model discloses an air-cooled screw type water chiller unit. The unit comprises an evaporator, a screw type compressor, a condenser and an expansion valve, wherein the condenser comprises a blower and a proportion integration differentiation (PID) variable-frequency controller which is used for controlling the rotation speed of the blower, the blower and the PID variable-frequency controller are connected, the evaporator is connected with the expansion valve and the screw type compressor respectively, the screw type compressor is connected with the condenser, and the condenser is connected with the expansion valve. By the aid of the unit, the rotation speed of the blower is matched with the external working condition and load of water chillers, the energy is saved to the great extent, the service life of the blower is prolonged, the blower works at a low temperature range through the control of the PID variable-frequency controller, and the working temperature range of the water chiller unit is widened.
Description
Technical field
The utility model relates to refrigeration technology field, relates in particular to a kind of air-cooled screw-type water chiller.
Background technology
At the central air-conditioning refrigerating field, air-cooled screw-type water chiller is general to adopt fixed blower fan frequently to carry out the condensation heat radiation, and promptly the rotating speed of blower fan is a certain steady state value.When outside operating mode and air conditioner load change, carry out the platform number through the mode of start and stop blower fan and regulate, below in conjunction with following form, be that example describes with 4 blower fans of single module.
| The blower fan sequence number | The blower fan halt condition | The fan starting condition |
| 1# | When outer temperature degree is reduced to A ℃ | When outer temperature degree is elevated to A+n ℃ |
| 2# | When outer temperature degree is reduced to B ℃ | When outer temperature degree is elevated to B+n ℃ |
| 3# | When outer temperature degree is reduced to C ℃ | When outer temperature degree is elevated to C+n ℃ |
| 4# | Compressor cuts out | Compressor start |
Wherein blower fan 1 ~ 4 is and decides the frequency blower fan, and starting back speed is a steady state value.Temperature value A>B>C, the less reasonable value of n for setting.In conjunction with going up table, can find out that in running, along with the rising of outer temperature degree, blower fan can start by platform, perhaps along with the reduction of outer temperature degree, blower fan can be shut down by platform.In addition, the blower fan start and stop are controlled outside considering gas Influence of Temperature, also will consider the influence of the pressure at expulsion of compressor, promptly when refrigeration, stop blower fan along with the reduction of pressure at expulsion by platform, perhaps start blower fan along with the rising of pressure at expulsion by platform.The above is the common fixed start and stop control principle of blower fan frequently in the industry, is called platform numerical control system.
There is following shortcoming in existing air-cooled screw-type water chiller:
(1), when outside operating mode and air conditioner load change, can only regulate through the mode of start and stop blower fan, and the rotating speed of blower fan is a steady state value, can't carry out optimum Match with outside operating mode and air conditioner load, therefore can't realize energy-conservation to greatest extent;
(2), when the fluctuation of outside working conditions change is bigger, blower fan will frequent start-stop, thereby has influenced the life-span of blower fan, and frequent start-stop can cause certain impact to electrical network;
When (3), the temperature degree is low outside; Blower fan is still being done constant speed drive; Can't keep the required force value of cold-producing medium circulate; Handpiece Water Chilling Units will forced stoppage, therefore adopts the fixed platform numerical control system of blower fan frequently can cause the operating temperature range of handpiece Water Chilling Units less, and its lower limit operating temperature is generally 5 ℃.
The utility model content
To above-mentioned technical problem, the utility model provides a kind of air-cooled screw-type water chiller, realize energy-conservationly to greatest extent, prolong fan life, and widen the operating temperature range of handpiece Water Chilling Units.
The utility model embodiment provides a kind of air-cooled screw-type water chiller, comprising: evaporimeter, helical-lobe compressor, condenser and expansion valve;
Said condenser comprises blower fan, and PID (PID, Proportion-Integration-Differentiation, the proportional-integral-differential) frequency-variable controller that is used to control said rotation speed of fan; Said blower fan is connected with said PID frequency-variable controller;
Said evaporimeter connects said expansion valve and said screw compressor respectively; Said screw compressor connects said condenser; Said condenser connects said expansion valve.
Implement the utility model embodiment, have following beneficial effect:
Condenser is provided with PID frequency-variable controller and blower fan, and blower fan connects the PID frequency-variable controller, and the rotating speed of blower fan can carry out optimum Match with outside operating mode and cooling-water machine load, realizes energy-conservation to greatest extent; The running of blower fan simultaneously need not to carry out frequent start and stop, has prolonged fan life; In addition, the PID frequency-variable controller can be controlled blower fan and operate at lower temperature range, has widened the operating temperature range of handpiece Water Chilling Units.
Description of drawings
Fig. 1 is the structural representation of the air-cooled screw-type water chiller that provides of the utility model embodiment;
Fig. 2 is the circuit structure diagram of the PID frequency-variable controller that provides of the utility model embodiment;
Fig. 3 is the control procedure sketch map of the PID frequency-variable controller control blower fan that provides of the utility model embodiment;
Fig. 4 is the operating temperature range sketch map of the air-cooled screw-type water chiller that provides for the utility model embodiment.
The specific embodiment
To combine the accompanying drawing among the utility model embodiment below, the technical scheme among the utility model embodiment is carried out clear, intactly description, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the utility model protection.
Referring to Fig. 1, the structural representation of the air-cooled screw-type water chiller that provides for the utility model embodiment.
The air-cooled screw-type water chiller that the utility model provides comprises: evaporimeter 101, screw compressor 102, condenser 103 and expansion valve 104.Condenser 103 comprises blower fan 1031, and the PID frequency-variable controller that is used to control the rotating speed of said blower fan 1031; Blower fan 1031 is connected with said PID frequency-variable controller.
Evaporimeter 101 connects expansion valve 104 and screw compressor 102, and screw compressor 102 connects condenser 103, and condenser 103 connects expansion valve 104.
In air-cooled screw-type water chiller operation process, evaporimeter 101 is provided with cold water inlet and cooling water outlet, chilled water is flow through and the absorbing environmental heat.Liquid refrigerant in the evaporimeter 101 absorbs the heat start vaporizer in the water, and it is poor that cold-producing medium and water form uniform temperature, finally is evaporated to gaseous state fully; The gaseous refrigerant that is come out by evaporimeter 101 is sucked and compression by screw compressor 102, and pressure and temperature is along with increase; Gaseous refrigerant is condensed into liquid through condenser 103 release heat then; The liquid refrigerant that goes out through condenser 103 heat releases gets into expansion valve 104, is expanded to low pressure, and liquid refrigerant transfers the gas-liquid mixed attitude material of low-temp low-pressure to, gets into evaporimeter 101 again and accomplishes circulation.The condensing mode of the air-cooled screw-type water chiller that present embodiment provides is the air cooling; The power of circulation of air is provided by the blower fan 1031 that is connected with the PID frequency-variable controller; The rotating speed of blower fan 1031 is controlled by the PID frequency-variable controller; Can realize the optimum Match of rotating speed and operating mode, realize energy-conservationly, and prolong fan life.
Referring to Fig. 2, the circuit structure diagram of the PID frequency-variable controller that provides for the utility model embodiment.
The PID frequency-variable controller that present embodiment provides comprises microprocessing unit 201, temperature detecting unit 202, pressure sensor 203, display unit 204 and frequency converter 205.Specific as follows:
During practical implementation; Microprocessing unit 201 is used to receive the temperature signal that temperature detecting unit 202 sends; And the pressure signal of pressure sensor 203 transmissions; To frequency converter 205 output frequency control signals, the different FREQUENCY CONTROL blower fan 1031 of frequency converter 205 outputs turns round with different rotating speed according to said temperature signal and pressure signal.
Referring to Fig. 3, the control procedure sketch map of the PID frequency-variable controller control blower fan that provides for the utility model embodiment.In conjunction with Fig. 2, after the air-cooled screw-type water chiller start, frequency converter 205 can rotate (in the present embodiment, the frequency range of blower fan is 6Hz-63Hz, starts frequency and is 6Hz) with initial frequency drives blower fan 1031.Temperature detecting unit 202 detects outer temperature degree, and will detect outer temperature degrees of data and be sent to microprocessing unit 201, target pressure value of the outer temperature degree setting of microprocessing unit 201 bases.Along with the running of air-cooled screw-type water chiller, the pressure of the gaseous refrigerant that in condenser, passes through improves gradually, and pressure sensor 203 detects the actual pressure value of unit in real time; And send to microprocessing unit 201; Microprocessing unit 201 is compared actual pressure value with target pressure value, if actual pressure value is higher than target pressure value, microprocessing unit 201 can be controlled the output frequency of rising frequency converter 205; Improve the rotating speed of blower fan 1031; Air quantity increases, and heat dissipation capacity increases, thereby actual pressure is reduced; Otherwise, being lower than target pressure value if work as actual pressure value, microprocessing unit 201 can be controlled the output frequency that reduces frequency converters 205, reduces the rotating speed of blower fan 1031; Air quantity reduces, and heat dissipation capacity reduces, thereby actual pressure is improved; Make actual pressure value approach thus, realize accurately control, need not to adopt the platform numerical control system of deciding the frequency blower fan to target pressure value; The blower fan running is complementary with outside operating mode, energy-conservation to greatest extent, and prolong fan life.
The energy-conservation situation of blower fan in the handpiece Water Chilling Units running that provides in the following form illustrative present embodiment.By fluid mechanics principle, in the blower fan operation, the rotation speed n of blower fan is directly proportional with frequency f.Air quantity Q is directly proportional with rotation speed n.Square being directly proportional of blast P and rotation speed n.The shaft power Pe of blower fan equals the product of air quantity Q and blast P, and promptly the shaft power of blower fan is directly proportional with the cube of rotation speed n.According to experiment test, blower fan is following in rotating speed, flow, shaft power, the concrete data of power saving rate power of each frequency, and its measured data and theory are roughly coincide:
| Frequency f (Hz) | Rotating speed (N%) | Flow (O%) | Shaft power (P%) | Power saving rate |
| 63 | 100 | 100 | 100 | 0% |
| 60 | 95.2 | 95.2 | 86.4 | 13.6% |
| 55 | 87.3 | 87.3 | 66.5 | 33.5% |
| 50 | 79.4 | 79.4 | 50.0 | 50.0% |
| 45 | 71.4 | 71.4 | 36.4 | 63.6% |
| 40 | 63.5 | 63.5 | 25.6 | 74.4% |
| 35 | 55.6 | 55.6 | 17.1 | 82.9% |
| 30 | 47.6 | 47.6 | 10.8 | 89.2% |
| 25 | 39.7 | 39.7 | 6.2 | 93.8% |
| 20 | 31.7 | 31.7 | 3.2 | 96.8% |
| 6 | 9.5 | 9.5 | 0.1 | 99.9% |
Referring to Fig. 4, the air-cooled screw-type water chiller operating temperature range sketch map that provides for the utility model embodiment.Adopting the fixed minimum environment temperature of handpiece Water Chilling Units work of blower fan frequently is 5 ℃, when under lower outer temperature degree condition, owing to decide blower fan constant speed running frequently, can't keep the pressure of cold-producing medium circulation, and handpiece Water Chilling Units can forced shutdown.Different with the handpiece Water Chilling Units that adopts fixed blower fan frequently; Under lower outer temperature degree; The air-cooled screw-type water chiller that present embodiment provides is controlled the rotating speed of blower fan through the PID frequency-variable controller; To guarantee to keep the required force value of freeze cycle, the minimum operating temperature of the air-cooled screw-type water chiller in the present embodiment is-15 ℃.
Implement the utility model embodiment, have following beneficial effect:
The rotating speed of blower fan is by the control of PID frequency-variable controller, and the rotating speed of blower fan can change along with the variation of outside operating mode and cooling-water machine load, makes blower fan running and operating mode form optimum Match, realizes energy-conservation to greatest extent; The running of blower fan simultaneously need not to carry out frequent start and stop, has prolonged fan life; In addition, the PID frequency-variable controller can be controlled blower fan and operate at lower temperature range, has widened the operating temperature range of handpiece Water Chilling Units.
The above is the preferred implementation of the utility model; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; Can also make some improvement and distortion, these improvement and distortion also are regarded as the protection domain of the utility model.
Claims (3)
1. an air-cooled screw-type water chiller is characterized in that, comprising: evaporimeter, screw compressor, condenser and expansion valve;
Said condenser comprises blower fan, and the PID frequency-variable controller that is used to control said rotation speed of fan; Said blower fan is connected with said PID frequency-variable controller;
Said evaporimeter connects said expansion valve and said screw compressor respectively; Said screw compressor connects said condenser; Said condenser connects said expansion valve.
2. air-cooled screw-type water chiller as claimed in claim 1 is characterized in that, said PID frequency-variable controller comprises microprocessing unit, temperature detecting unit, pressure sensor and frequency converter;
Said temperature detecting unit is connected with said microprocessing unit, and said temperature detecting unit detects outer compression ring border temperature, and temperature signal is sent to said microprocessing unit;
Said pressure sensor is connected with said microprocessing unit, and said pressure sensor detects the actual pressure value of the gaseous refrigerant that passes through in the said condenser, and pressure signal is sent to said microprocessing unit;
Said frequency converter is connected with said microprocessing unit, said blower fan respectively; The output frequency that said microprocessing unit is controlled said frequency converter according to the outer compression ring border temperature and the actual pressure value of unit is by the rotating speed of the said blower fan of said Frequency Converter Control.
3. air-cooled screw-type water chiller as claimed in claim 2 is characterized in that, said PID frequency-variable controller also comprises display unit;
Said display unit is connected with said microprocessing unit, and said display unit receives the data of said microprocessing unit, shows the operating temperature and the pressure information of cooling-water machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220258939 CN202630496U (en) | 2012-06-04 | 2012-06-04 | Air-cooled screw type water chiller unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220258939 CN202630496U (en) | 2012-06-04 | 2012-06-04 | Air-cooled screw type water chiller unit |
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| CN202630496U true CN202630496U (en) | 2012-12-26 |
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| CN 201220258939 Expired - Lifetime CN202630496U (en) | 2012-06-04 | 2012-06-04 | Air-cooled screw type water chiller unit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103925755A (en) * | 2013-01-16 | 2014-07-16 | 珠海格力电器股份有限公司 | Running control method for fan group at condensing side of refrigeration system |
| CN104279805A (en) * | 2014-10-10 | 2015-01-14 | 武汉福星生物药业有限公司 | Method for controlling running of water-cooled screw-type refrigerating unit |
| CN104896626A (en) * | 2014-03-07 | 2015-09-09 | 珠海格力电器股份有限公司 | Refrigeration control method of air-cooled chiller unit, control device and unit system |
| CN107062546A (en) * | 2017-04-18 | 2017-08-18 | 广东志高暖通设备股份有限公司 | A kind of air-conditioning system for possessing self-checking function |
-
2012
- 2012-06-04 CN CN 201220258939 patent/CN202630496U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103925755A (en) * | 2013-01-16 | 2014-07-16 | 珠海格力电器股份有限公司 | Running control method for fan group at condensing side of refrigeration system |
| CN103925755B (en) * | 2013-01-16 | 2016-06-08 | 珠海格力电器股份有限公司 | Refrigeration system condensation side blower fan group method for controlling of operation |
| CN104896626A (en) * | 2014-03-07 | 2015-09-09 | 珠海格力电器股份有限公司 | Refrigeration control method of air-cooled chiller unit, control device and unit system |
| CN104279805A (en) * | 2014-10-10 | 2015-01-14 | 武汉福星生物药业有限公司 | Method for controlling running of water-cooled screw-type refrigerating unit |
| CN107062546A (en) * | 2017-04-18 | 2017-08-18 | 广东志高暖通设备股份有限公司 | A kind of air-conditioning system for possessing self-checking function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Conghua City, Guangzhou City, Guangdong province 510935 Ao mayor waist ridge side of State Road 106 Guangzhou Hitachi Refrigeration Co. Ltd (building) Patentee after: Johnson of Hitachi (Guangzhou) Co., Ltd. Wanbao air conditioning Address before: Conghua City, Guangzhou City, Guangdong province 510935 Ao mayor waist ridge side of State Road 106 Guangzhou Hitachi Refrigeration Co. Ltd (building) Patentee before: Hitachi Air-Conditioning & Refrigerating Products (Guangzhou) Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121226 |