CN202581676U - Comprehensive frequency conversion system of circulating pump - Google Patents
Comprehensive frequency conversion system of circulating pump Download PDFInfo
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- CN202581676U CN202581676U CN 201220108277 CN201220108277U CN202581676U CN 202581676 U CN202581676 U CN 202581676U CN 201220108277 CN201220108277 CN 201220108277 CN 201220108277 U CN201220108277 U CN 201220108277U CN 202581676 U CN202581676 U CN 202581676U
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Abstract
The utility model discloses a comprehensive frequency conversion system of a circulating pump. The comprehensive frequency conversion system comprises a main control module, a water chilling unit system and a heat pump unit system. The main control module consists of a programmable logic controller, a digital-to-analogue conversion input module, a digital-to-analogue conversion output module, a switch input module and a switch output module. The water chilling unit system consists of a water-cooling water chilling unit, a primary refrigeration pump and a cooling pump, wherein the water-cooling water chilling unit belongs to the primary refrigeration pump and the cooling pump. The heat pump unit system consists of a water-water heat pump unit, a primary refrigeration pump and a cooling pump, wherein the water-water heat pump unit belongs to the primary refrigeration pump and the cooling pump. The digital-to-analogue conversion input module is connected with the water chilling unit system and a differential pressure temperature sensor of the heat pump unit system, and the digital-to-analogue conversion output module is connected with the water chilling unit system and a frequency converter of the heat pump unit system. The system achieves energy-saving effect of a central air-conditioner through comprehensive frequency conversion control of a primary circulating pump and has the advantages of being high in comprehensive energy saving, good in tail end using effect, stable in unit operation and long in service life.
Description
Technical field
The utility model relates to central air-conditioning control field, and is particularly a kind of through the energy-conservation system of the comprehensive VFC realization of circulating pump.
Background technology
The water-cooled handpiece Water Chilling Units is to depend on water to circulate and reach condensation effect, the air-conditioning unit that circulates and take away preset cold by water then.At present the VFC of supporting refrigerating water pump of water-cooled handpiece Water Chilling Units and water-water heat pump unit and coolant pump adopts is to supply water and the pressure differential of backwater is controlled; The temperature difference control that has also comprised water supply and backwater of minute quantity, wherein refrigerating water pump refers to share in low-temperature receiver side and load side the refrigerating water pump system of one group of circulating pump.
Refrigerating water pump and coolant pump are different from the water pump that specialty such as plumbing is used; Their function is the heat circulation; The circulation of medium is in order to transmit heat; And the power consumption of pump is directly proportional with the cube of rotating speed, so the purpose of the variable frequency adjustment of refrigerating water pump and coolant pump is energy-saving and cost-reducing but not satisfies technological requirement.The energy consumption of refrigerating water pump and coolant pump is bigger and the rate-of flow efficient that can cause refrigeration or heat less than normal reduces, the energy consumption rising because the transmission effect of the big more heat of rate-of flow is good more, and system can make the frequency reduction too much also can cause terminal cold/shortage of heat under the situation that does not have the secondary refrigerating water pump in addition.
The factor that a known refrigerating water pump and coolant pump frequency conversion at present all need be considered comprises the work requirements of water-cooled handpiece Water Chilling Units and water-water heat pump unit.An other refrigerating water pump also need be considered the demand of terminal air-conditioning equipment; Coolant pump need be considered the demand influence of the variation of cooling water temperature to water-cooled handpiece Water Chilling Units and water-water heat pump unit.
Mostly a traditional refrigerating water pump and coolant pump converter technique are single-point type control; Only satisfy in the above-mentioned factor of considering; And because the technical protection of water-cooled handpiece Water Chilling Units and water-water heat pump unit is stronger; A common refrigerating water pump converter technique is the demand according to terminal air-conditioning equipment, and the coolant pump converter technique is according to cooling water temperature; Set a minimum frequency conversion value in order to protect water-cooled handpiece Water Chilling Units and water-water heat pump unit then.So the result is exactly that the energy consumption of refrigerating water pump and coolant pump has reduced, and the energy consumption of water-cooled handpiece Water Chilling Units and water-water heat pump unit has raise, even has occurred the situation of overall energy consumption rising on a small quantity, and energy-conservation effect is had a greatly reduced quality.
Summary of the invention
In order to overcome the deficiency of prior art, the present invention provides a kind of and realizes energy-conservation system through the comprehensive VFC of circulating pump.
The technical solution adopted for the present invention to solve the technical problems is:
The comprehensive frequency conversion system of a kind of circulating pump; Comprise the main control module of forming by Programmable Logic Controller, digital-to-analogue conversion input module, digital-to-analogue conversion output module, input module switch, switching output module; Form water chilling unit system by refrigerating water pump under water-cooled handpiece Water Chilling Units and the water-cooled handpiece Water Chilling Units and coolant pump; Form heat pump machine system by refrigerating water pump under water-water heat pump unit and the water-water heat pump unit and coolant pump; Wherein said digital-to-analogue conversion input module is connected with the pressure reduction temperature sensor of water chilling unit system with heat pump machine system; The digital-to-analogue conversion output module is connected with the frequency converter of water chilling unit system with heat pump machine system; Input module switch and the water chilling unit system and frequency converter, the water pump of heat pump machine system are connected and accept the status data of frequency converter, water pump, and switching output module is connected with water pump with the frequency converter of water chilling unit system with heat pump machine system.
The comprehensive energy-saving and frequency-variable method of a kind of circulating pump; Comprise by water-cooled handpiece Water Chilling Units, water-water heat pump unit, with the supporting refrigerating water pump of water-cooled handpiece Water Chilling Units and coolant pump, with the circulation cold supply system that the supporting refrigerating water pump of water-water heat pump unit and coolant pump and terminal air-conditioning unit are formed, may further comprise the steps:
1) duty of collection water-cooled handpiece Water Chilling Units and water-water heat pump unit comprises power P
WWith operating current I;
The data of 2) gathering according to step 1 are calculated current percent load, and according to water-cooled handpiece Water Chilling Units and water-water heat pump unit in each operation interval equal percentage classification;
Whether the traffic requirement of 3) judging each grade all satisfies interval interior upper limit flow and meets the flow that the unit loading requires, and the adjustment frequency conversion is exported;
4) control of the unsteady flow amount of a direct cooling of refrigerating water pump, the confession/pressure of return water difference Δ P of collection cooling water is according to current differential pressure Δ P and setting pressure differential deltap P
AdTo recently adjusting frequency conversion output;
5) coolant pump VFC is gathered advancing/the leaving water temperature temperature data of cooling water, when advance/water outlet temperature difference T is greater than setting value or inflow temperature T
InThen increase frequency conversion output when being higher than setting value.
To detect control more convenient in order to make, in the said step 1, when the refrigerating/heating amount at 1000KW with the unit of interior and compression board number >=3 monitoring compressor workbench number only.
In order to guarantee precise control when high-power, in the said step 1, when the refrigerating/heating amount is monitored the unit running load with units interior and compression board number >=3 through installing current transducer additional at 1000KW.
Also can realize energy-saving and frequency-variable in order to make a refrigerating water pump at the constant flow state; In the said step 4; When the direct cooling of refrigerating water pump is constant flow; After gathering the confession/pressure of return water difference data of cooling water, gather supply water temperature and return water temperature again, export when confessions/backwater temperature difference increases frequency conversion during greater than setting value.
In order further to improve energy-saving effect, in the said step 4, the pressure reduction temperature difference increased the water pump number when refrigerating water pump or coolant pump were according to work under the water-cooled handpiece Water Chilling Units on corresponding basis.
The invention has the beneficial effects as follows: this system has the synthesis energy saving height through the energy-saving effect of the comprehensive VFC realization of a circulating pump central air-conditioning, and terminal result of use is good, and unit operation is stable, the advantage of long service life.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Fig. 1 is that system of the present invention connects sketch map;
Fig. 2 is the flow chart of the VFC flow process of a direct cooling variable flow system of refrigerating water pump of the present invention;
Fig. 3 is the flow chart of the VFC flow process of a direct cooling constant flow water system of refrigerating water pump of the present invention;
Fig. 4 is the flow chart of the comprehensive VFC flow process of coolant pump of the present invention.
The specific embodiment
With reference to Fig. 1.The comprehensive frequency conversion system of a kind of circulating pump; Comprise the main control module of forming by Programmable Logic Controller 11, digital-to-analogue conversion input module 21, digital-to-analogue conversion output module 22, input module switch 31, switching output module 32 1; Form water chilling unit system 4 by refrigerating water pump under water-cooled handpiece Water Chilling Units 41 and the water-cooled handpiece Water Chilling Units 41 and coolant pump; Form heat pump machine system 5 by water-water heat pump unit 51 and water-water heat pump unit 51 affiliated refrigerating water pumps and coolant pump; Wherein said digital-to-analogue conversion input module 21 is connected with the pressure reduction temperature sensor of water chilling unit system 4 with heat pump machine system 5; Digital-to-analogue conversion output module 22 is connected and exports the adjusting load instruction of frequency converter with the frequency converter of water chilling unit system 4 and heat pump machine system 5; Input module switch 31 and the water chilling unit system 4 and frequency converter, the water pump of heat pump machine system 5 are connected and accept the status data of frequency converter, water pump, and switching output module 32 is connected with water pump with the frequency converter of water chilling unit system 4 and heat pump machine system 5 and exports the switch order of frequency converter and power frequency, the frequency conversion switch order of water pump.
With reference to Fig. 2, Fig. 3, Fig. 4.A comprehensive VFC of circulating pump is at first gathered the duty of water-cooled handpiece Water Chilling Units 41 and water-water heat pump unit 51, comprises power P
WWith operating current I, according to power P
W=voltage U * operating current I=flow Q * theoretical head H * density p * gravity acceleration g formula is to confirm how many circulating water flows present unit needs.For the refrigerating/heating amount at 1000KW with units interior and compression board number >=3; Because the loading progression of the multi-compressor unit that its refrigerating capacity is less is with number of compressors or 2 times of number of compressors; And actual error is no more than the preset remaining that loads of unit; Therefore only monitoring compressor workbench number gets final product, and other unit must install current transducer additional monitors the unit running load.In addition, provide the system of information port also can adopt data that unit provides, but relative cost can be higher as priority signal.
After water-cooled handpiece Water Chilling Units 41 is come up with the 51 load data collections of water-water heat pump unit; Count maximum value calculation according to the unit of water-cooled handpiece Water Chilling Units 41 and water-water heat pump unit 51 and go out current percent load; Concrete through the running current detection; Need current electric current and rated current contrast be drawn current percent load; If only detect compression board number, then according to when of the contrast of foreground number with total platform number, and if compressor have the compressor horsepower that also needs to move of size difference to draw percent load with the contrast of total compressor power.The minimum load of system is as the 1st grade, and then in the classification of above operation interval equal percentage, wherein progression is at 3 grades～10 grades, and progression too much is unfavorable for control, crosses not have energy-saving effect at least.The traffic requirement of each grade must satisfy interval interior upper limit flow simultaneously and meet the flow that unit loads requirement, and the preset value of this parameter draws according to the calculated value of unit efficiency curve, then artificial adjustment the in debug process.Specifically calculate the refrigerating capacity under the respective load, confirm setting value according to the ratio of refrigerating capacity under this load and specified refrigerating capacity through the frequency conversion flow changing curve again according to the efficiency opisometer under the different weight percentage load of reality; When shortage is correlated with efficiency curve data; In the time of then need passing through record separate unit unit operation; Leaving water temperature is near setting value the time; The setting value of different loads keeps down the Inlet and outlet water temperature difference when being specified temperature difference frequency converter, the ratio of refrigerating capacity equals the ratio of flow under the constant situation of the temperature difference, when value, should get the maximum load of this setting load patch in addition.
After having been arranged, system's bare flow data come the final frequency conversion value of confirming according to ancillary equipment heat exchange situation again:
1. comprehensive VFC of refrigerating water pump
With reference to Fig. 2.In the variable flow system of a direct cooling of refrigerating water pump, must gather confession/pressure of return water difference data,, set pressure reduction by the terminal situation decision (can revise easily) of least favorable according to exporting of current differential pressure and setting pressure reduction to recently adjusting frequency conversion.When pressure reduction directly increases frequency conversion output during less than setting value; And whether pressure reduction need judge current frequency conversion output during greater than setting value greater than the unit demand, just can reduce frequency conversion output according to pressure reduction greater than the unit demand, otherwise the frequency conversion of just keeping the unit demand is exported.
With reference to Fig. 3.The constant flow water system of a direct cooling of refrigerating water pump is not do frequency conversion traditionally, but the space of frequency conversion adjustment is also arranged in the actual use, except gathering confession/pressure of return water difference data, also will gather supply water temperature and return water temperature on the concrete embodiment.Unit demand and pressure differential be simultaneously as ensureing data, when confessions/backwater temperature difference during greater than setting value directly the increase frequency conversion export; And supply/backwater temperature difference all meets design temperature less than setting value and confession/return water temperature and judges unit demand and pressure differential when interval, when having the frequency reducing space, just reduces frequency conversion output.
An other comprehensive frequency-changing control system of refrigerating water pump increases pumping function in addition; A refrigerating water pump will be gone up on the corresponding basis of original unit-water pump and increase corresponding water pump when starting this function; A for example original machine becomes a machine to two pumps to a pump, and transition season starts this function when pressure reduction is very low can satisfy instructions for use under the prerequisite that reduces main frame operation platform number; Winter, the water-water heat pump unit can run into water source (the source) situation that circulating water temperature is low, started this function and can reduce the main frame energy consumption through increasing pump energy consumption, thereby reach the purpose of synthesis energy saving.
2. the comprehensive VFC of coolant pump
With reference to Fig. 4.The coolant pump frequency conversion also be with the unit demand be under the prerequisite of basic guarantee according to advance/leaving water temperature adjusts frequency conversion output.Directly increase frequency conversion output when advancing/go out water temperature difference when being higher than setting value greater than setting value or inflow temperature (leaving water temperature is as subsequent use); And advance/the water outlet temperature difference is less than setting value and advance/judge when leaving water temperature all meets the design temperature interval unit demand, when having the frequency reducing space, just reduces frequency conversion output.
The comprehensive VFC of coolant pump equally also has the pumping function of increasing, and the summer environment temperature starts this function when high can reduce the main frame energy consumption through increasing pump energy consumption equally, and reaches the purpose of synthesis energy saving.
Claims (1)
1. comprehensive frequency conversion system of circulating pump; It is characterized in that: comprise the main control module of forming by Programmable Logic Controller (11), digital-to-analogue conversion input module (21), digital-to-analogue conversion output module (22), input module switch (31), switching output module (32) (1); Form water chilling unit system (4) by refrigerating water pump under water-cooled handpiece Water Chilling Units (41) and the water-cooled handpiece Water Chilling Units (41) and coolant pump; Form heat pump machine system (5) by water-water heat pump unit (51) and affiliated refrigerating water pump of water-water heat pump unit (51) and coolant pump; Wherein said digital-to-analogue conversion input module (21) is connected with the pressure reduction temperature sensor of water chilling unit system (4) with heat pump machine system (5); Digital-to-analogue conversion output module (22) is connected with the frequency converter of water chilling unit system (4) with heat pump machine system (5); Input module switch (31) and the water chilling unit system (4) and frequency converter, the water pump of heat pump machine system (5) are connected and accept the status data of frequency converter, water pump, and switching output module (32) is connected with water pump with the frequency converter of water chilling unit system (4) with heat pump machine system (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220108277 CN202581676U (en) | 2012-03-21 | 2012-03-21 | Comprehensive frequency conversion system of circulating pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220108277 CN202581676U (en) | 2012-03-21 | 2012-03-21 | Comprehensive frequency conversion system of circulating pump |
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| CN202581676U true CN202581676U (en) | 2012-12-05 |
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| CN 201220108277 Expired - Fee Related CN202581676U (en) | 2012-03-21 | 2012-03-21 | Comprehensive frequency conversion system of circulating pump |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104390316A (en) * | 2014-12-25 | 2015-03-04 | 李钢 | Distributed freeze pump controller for concentrated air conditioning |
| CN105652773A (en) * | 2016-03-22 | 2016-06-08 | 广西华锐钢铁工程设计咨询有限责任公司 | Cooling system temperature and pressure difference detecting and monitoring system |
| CN110928225A (en) * | 2019-12-03 | 2020-03-27 | 广东志高暖通设备股份有限公司 | Module water machine system and control method thereof |
| US10941955B2 (en) | 2017-10-27 | 2021-03-09 | Dometic Sweden Ab | Systems, methods, and apparatuses for providing communications between climate control devices in a recreational vehicle |
| CN113028619A (en) * | 2021-04-22 | 2021-06-25 | 武汉奇威特建安工程有限公司 | Variable-flow active energy-saving automatic control system of heating and ventilation air conditioning water system |
| US11254183B2 (en) | 2017-08-25 | 2022-02-22 | Dometic Sweden Ab | Recreational vehicle, cooling device, controlling system and method for controlling the cooling device |
-
2012
- 2012-03-21 CN CN 201220108277 patent/CN202581676U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104390316A (en) * | 2014-12-25 | 2015-03-04 | 李钢 | Distributed freeze pump controller for concentrated air conditioning |
| CN104390316B (en) * | 2014-12-25 | 2017-05-17 | 李钢 | Distributed freeze pump controller for concentrated air conditioning |
| CN105652773A (en) * | 2016-03-22 | 2016-06-08 | 广西华锐钢铁工程设计咨询有限责任公司 | Cooling system temperature and pressure difference detecting and monitoring system |
| US11254183B2 (en) | 2017-08-25 | 2022-02-22 | Dometic Sweden Ab | Recreational vehicle, cooling device, controlling system and method for controlling the cooling device |
| US11919363B2 (en) | 2017-08-25 | 2024-03-05 | Dometic Sweden Ab | Recreational vehicle, cooling device, controlling system and method for controlling the cooling device |
| US10941955B2 (en) | 2017-10-27 | 2021-03-09 | Dometic Sweden Ab | Systems, methods, and apparatuses for providing communications between climate control devices in a recreational vehicle |
| CN110928225A (en) * | 2019-12-03 | 2020-03-27 | 广东志高暖通设备股份有限公司 | Module water machine system and control method thereof |
| CN110928225B (en) * | 2019-12-03 | 2023-06-20 | 广东开利暖通空调股份有限公司 | Modular water machine system and control method thereof |
| CN113028619A (en) * | 2021-04-22 | 2021-06-25 | 武汉奇威特建安工程有限公司 | Variable-flow active energy-saving automatic control system of heating and ventilation air conditioning water system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121205 Termination date: 20180321 |