CN207688366U - Air conditioning water system vari- able flow control system - Google Patents
Air conditioning water system vari- able flow control system Download PDFInfo
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- CN207688366U CN207688366U CN201721807886.6U CN201721807886U CN207688366U CN 207688366 U CN207688366 U CN 207688366U CN 201721807886 U CN201721807886 U CN 201721807886U CN 207688366 U CN207688366 U CN 207688366U
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Abstract
The utility model proposes an a kind of air conditioning water system vari- able flow control systems, by the way that the first differential pressure pickup, the second differential pressure pickup, flow controller and pump variable frequency device is arranged, smaller water knockout drum, water collector pressure differential resetting value control water pump frequency may be used, make water pump operation in lower frequency, can more reduce the operation energy consumption of water pump；It can be by controlling water pump inlet outlet pressure differential and real time execution frequency, it is ensured that system water flow meets the minimum water flow of setting, ensures the safe operation of system in conjunction with pump characteristics computing system water flow according to water pump inlet outlet pressure differential and real time execution frequency；Flowmeter detecting system water flow need not be installed, it can ensure that and the water flow of system maintained into minimum water flow, the cost of control device is greatly saved, solve the problems, such as an air conditioning water variable flow system in the case of no flowmeter system minimum discharge it is difficult to ensure that.
Description
Technical field
The utility model is related to air-conditioner water system control fields, more particularly to an a kind of air conditioning water system variable-flow
Control system.
Background technology
With the development of technology with the raising of the standard of living, the application of air-conditioning system is also more and more extensive.Air-conditioning system
Energy consumption accounts for the 40%~60% of building energy consumption, and the energy consumption of air-conditioner water system accounts for 30% of air conditioning energy consumption or so.Building
Air conditioner load constantly changes with the variation of out door climatic parameter and indoor quantity of heat production, and most of the time, building air conditioning load is in
Part load condition, the water flow most of the time that air-conditioner water system needs are less than design water flow.Therefore, variable-flow air-conditioning cold
Freeze water system because it can be adjusted pump rotary speed according to the demand of air conditioning terminal water and then largely reduce the energy of water pump
Consumption is widely used.But in practical engineering application, because of the limitation of control method so that variable-flow air conditioning water system
It is unable to reach expected operational effect.In Practical Project, variable-flow air conditioning water system is frequently with water collecting and diversifying device pressure difference control
System realizes the variable frequency adjustment of water pump.In general, evaporator of refrigerator is there are a minimum limit flow, and usually evaporator is specified
The 50% of flow, when evaporator of refrigerator flow is less than its minimum limit flow, refrigeration machine will send out fault-signal and carry out
Self-shield is shut down.In order to avoid evaporator of refrigerator because flow is too low and self-shield is shut down, often take in Practical Project larger
Water collecting and diversifying device pressure differential resetting value, this adjustable extent for allowing for system water flow becomes smaller, and the running frequency of water pump is higher, according to
So the mode for turning down end valve is needed to reduce system water flow, the energy consumption of water pump is still higher, and energy-saving effect is poor.
In order to ensure the minimum discharge of refrigeration machine, reach ideal energy-saving effect, also has and using water collecting and diversifying device pressure difference control
Lower pressure differential resetting value is taken when processed, flowmeter and flow bypass device can be installed in chilled water system at this time, to flow system flow
It is monitored, and opens bypath valve when flow system flow is smaller.But installation is for practical in practical water system
Unite control flow sensor cost it is excessively high, and the problems such as due to in-site installation space and insufficient position, can exist and measure not
Accurate disadvantage.
Utility model content
In view of this, the utility model proposes an a kind of air conditioning water system vari- able flow control system, Neng Gou
Under the premise of ensuring system safe and stable operation and meeting end water demand, pump energy consumption is saved to greatest extent.
What the technical solution of the utility model was realized in：
The utility model provides an a kind of air conditioning water system vari- able flow control system comprising water pump, refrigeration
Machine evaporator, water knockout drum, water collector, end valve, electronic by-passing valve and electronic by-pass valve actuator, water pump, water knockout drum, end
Valve, water collector, evaporator of refrigerator and water pump are sequentially communicated to form water circulation channel, and electronic by-passing valve is respectively communicated with water knockout drum
And water collector, further include the first differential pressure pickup, the second differential pressure pickup, flow controller and pump variable frequency device, wherein
First differential pressure pickup acquires the real-time pressure difference between water knockout drum and water collector and is sent to flow controller；
Second differential pressure pickup acquires the real-time pressure difference between pump intake and water outlet and is sent to flow control
Device；
Flow controller is connected separately the first differential pressure pickup, the second differential pressure pickup, electronic by-pass valve actuator
With pump variable frequency device, the real-time pressure difference acquired according to the first differential pressure pickup and the second differential pressure pickup controls electronic by-passing valve and holds
Row device and pump variable frequency device；
Electronic by-pass valve actuator connects electronic by-passing valve, controls its valve opening degree；
Pump variable frequency device connects water pump, controls its running frequency.
On the basis of above technical scheme, it is preferred that further include vulnerabilities scan cabinet and power switch unit, the flow
Controller and power switch unit are arranged in vulnerabilities scan cabinet, and power switch unit is electrically connected flow controller and connects with power supply
It connects.
On the basis of above technical scheme, it is preferred that further include power distribution cabinet and power supply is spaced apart unit, the pump variable frequency
Device and power supply are spaced apart unit and are arranged in power distribution cabinet, and power supply is spaced apart unit and is electrically connected pump variable frequency device and electrical source of power.
On the basis of above technical scheme, it is preferred that the electronic by-passing valve is set between water knockout drum and water collector
On balance pipe.
On the basis of above technical scheme, it is preferred that the electronic by-passing valve is set between water knockout drum and water collector
On balance pipe.
On the basis of above technical scheme, it is preferred that flow controller is according to real-time between water knockout drum and water collector
Real-time pressure difference between pressure difference and pump intake and water outlet calculates the running frequency of water pump in conjunction with the characteristic of water pump operation
With electronic bypass valve opening, and water pump and electronic by-passing valve are controlled by pump variable frequency device and electronic by-pass valve actuator
System.
Air conditioning water system vari- able flow control system of the utility model has with following compared with the existing technology
Beneficial effect：
(1) it by the way that the first differential pressure pickup, the second differential pressure pickup, flow controller and pump variable frequency device is arranged, compares
Smaller water knockout drum, water collector pressure differential resetting value control may be used in conventional chilled water variable flow system control, the utility model
Water pump frequency processed makes water pump operation in lower frequency, can more reduce the operation energy consumption of water pump；
(2) according to water pump inlet outlet pressure differential and real time execution frequency, in conjunction with pump characteristics computing system water flow, Neng Goutong
Cross control water pump inlet outlet pressure differential and real time execution frequency, it is ensured that system water flow meets the minimum water flow of setting, ensures system
The safe operation of system；
(3) according to water pump inlet outlet pressure differential signal, the aperture of electronic by-passing valve is controlled, flowmeter detection system need not be installed
System water flow, you can ensure the water flow of system maintaining minimum water flow, the cost of control device is greatly saved, effectively
Ground solve an air conditioning water variable flow system in the case of no flowmeter system minimum discharge it is difficult to ensure that difficulty
Topic.
Description of the drawings
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, other drawings may also be obtained based on these drawings.
Fig. 1 is the control principle drawing of air conditioning water system vari- able flow control system of the utility model；
Fig. 2 is the principle that the utility model control system system water flow is first calculated close to water flow when minimum flow value
Figure；
Fig. 3 is the schematic diagram that water flow calculates when the utility model control system water pump frequency first reaches minimum frequency value.
Specific implementation mode
Below in conjunction with the attached drawing in the utility model embodiment, to the technical solution in the utility model embodiment
It being clearly and completely described, it is clear that described embodiment is only a part of embodiment of the utility model, without
It is whole embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making creation
Property labour under the premise of the every other embodiment that is obtained, shall fall within the protection scope of the present invention.
Embodiment one：Air conditioning water system vari- able flow control system
As shown in Figure 1, an air conditioning water system vari- able flow control system in the present embodiment comprising water pump 1, system
Cold evaporator 2, water knockout drum 3, water collector 4, end valve 5, electronic by-passing valve 6, electronic by-pass valve actuator 7, the first pressure difference
Sensor 8, the second differential pressure pickup 9, vulnerabilities scan cabinet 10, power switch unit 11, flow controller 12, power distribution cabinet 13, water
Pump frequency conversion device 14 and power supply are spaced apart unit 15.
Wherein, water pump 1, water knockout drum 3, end valve 5, water collector 4, evaporator of refrigerator 2 and water pump 1 are sequentially communicated to be formed
Water circulation channel, electronic by-passing valve 6 are respectively communicated with water knockout drum 3 and water collector 4.It is prior art part above.Specifically, described
Electronic by-passing valve 6 is set between water knockout drum 3 and water collector 4 on balance pipe.
First differential pressure pickup 8 acquires the real-time pressure difference between water knockout drum 3 and water collector 4 and is sent to flow controller
12。
Second differential pressure pickup 9 acquires the real-time pressure difference between 1 inlet and outlet of water pump and is sent to flow control
Device 12.
Computer processor chip can be used in flow controller 12, is connected separately the first differential pressure pickup 8, second
Differential pressure pickup 9, electronic by-pass valve actuator 7 and pump variable frequency device 14, according to the first differential pressure pickup 8 and the second pressure difference sensing
The real-time pressure difference that device 9 acquires controls electronic by-pass valve actuator 7 and pump variable frequency device 14.Specifically, flow controller 12 inputs
Signal the first differential pressure pickup 8 and the second differential pressure pickup 9, output end are connected separately pump variable frequency device 14 and electricity respectively at end
Dynamic by-pass valve actuator 7.
Electronic by-pass valve actuator 7 connects electronic by-passing valve 6, controls its valve opening degree；
Pump variable frequency device 14 connects water pump 1, controls its running frequency, and then the water supply of control system.
Power supply as flow controller 12 and physical protection part, vulnerabilities scan cabinet 10 and power switch unit 11, institute
It states flow controller 12 and power switch unit 11 is arranged in vulnerabilities scan cabinet 10, power switch unit 11 is electrically connected flow
Controller 12 is connect with power supply.
Power supply as pump variable frequency device 14 and physical protection part further include that power distribution cabinet 13 and power supply are spaced apart unit 15,
The pump variable frequency device 14 and power supply are spaced apart unit 15 and are arranged in power distribution cabinet 13, and power supply is spaced apart unit 15 and is electrically connected water pump change
Frequency device 14 and electrical source of power.
Embodiment two：The controlling party of air conditioning water system vari- able flow control system of the utility model introduced below
Method.
An air conditioning water system vari- able flow control system in embodiment one at work, gives water knockout drum 3 first
Pressure differential resetting value Δ P between water collector 40, the minimum running frequency f of water pump 1 is setminWith system minimum discharge Qmin.System
When system operation, the power supply in power distribution cabinet 13 is spaced apart the closure of unit 15, and the power switch unit 11 in vulnerabilities scan cabinet 10 is closed, and is
Each component of uniting works normally.
When system works, the first differential pressure pickup 8 measures the real-time pressure differential deltap P between water knockout drum 3 and water collector 4, and will
Real-time pressure differential deltap P is sent to flow controller 12, and flow controller 12 is by the real-time pressure differential deltap P of measurement and water knockout drum 3 and catchments
Preset pressure value Δ P between device 40It is compared, and amplitude is regulated and controled according to the frequency of the two mathematic interpolation water pump 1, and pass through
Pump variable frequency device 14 adjusts the running frequency of water pump 1, and the real-time pressure differential deltap P between water knockout drum 3 and water collector 4 is maintained setting
It is worth Δ P0.In this way, the operation frequency of the pressure differential resetting value control water pump 1 between smaller water knockout drum 3 and water collector 4 may be used
Rate makes water pump 1 operate in lower frequency, can more reduce the operation energy consumption of water pump 1.
When air conditioner load reduces, end valve 5 turns down, and the pressure difference between water knockout drum 3 and water collector 4 increases, 1 frequency of water pump
Can constantly it reduce, system water flow reduces.Flow controller 12 is according to 1 water inlet of the second 9 collected water pump of differential pressure pickup
The running frequency f of real-time pressure differential deltap H and water pump 1 between water outlet calculate air-conditioning cold in conjunction with the characteristic curve of water pump 1
Freeze water system water flow Q, and the minimum discharge Q being arranged with air conditioning water systemminIt is compared, and passes through pump variable frequency device
14 and electronic by-pass valve actuator 7 control water pump 1 running frequency higher than setting minimum running frequency fmin, air conditioning water
Minimum discharge Q of the water flow of system higher than settingmin.As shown in Fig. 2, the running frequency f when water pump 1 is not up to arranged most
Small running frequency fminAnd the air conditioning water system water flow Q calculated reaches the minimum discharge Q of settingminWhen, water pump 1 maintains fortune
Line frequency f operations are constant, and running frequency at this time is f0If the pressure difference between 1 inlet and outlet of water pump is Δ H at this time0,
And by Δ H0It is sent to flow controller 12 as pressure differential resetting value, by flow controller 12 according to the real-time pressure differential deltap H of measurement
It controls 6 valve opening degree of electronic by-passing valve and maintains setting value Δ H to real-time pressure differential deltap H0；Such as Fig. 3, when the operation frequency of water pump 1
Rate f first reaches the minimum frequency f of settingminWhen, 1 running frequency f of water pump keeps minimum frequency fminIt is constant, continue to monitor water pump 1
Real-time pressure differential deltap H between inlet and outlet, when the water flow Q of calculating is close to minimum discharge QminWhen, if water pump 1 at this time
Pressure difference between inlet and outlet is Δ H0, and by Δ H0It is sent to flow controller 12, flow control as pressure differential resetting value
Device 12 processed controls electronic 6 valve opening degree of by-passing valve according to the real-time pressure differential deltap H of measurement and maintains setting value to real-time pressure differential deltap H
ΔH0.Specifically, the real-time pressure differential deltap H between 1 inlet and outlet of the second 9 collected water pump of differential pressure pickup, and will
Real-time pressure differential deltap H is transferred to flow controller 12, and flow controller 12 is by real-time pressure differential deltap H and pressure differential resetting value Δ H0Compared
Compared with the valve opening degree amplitude of accommodation for calculating electronic by-passing valve 6, and export to electronic by-pass valve actuator 7, by electronic by-passing valve
Actuator 7 controls the valve opening degree of electronic by-passing valve 6, and real-time pressure differential deltap H is maintained setting value Δ H0.In this way, can basis
Real-time pressure difference between 1 inlet and outlet of water pump and real time execution frequency, in conjunction with 1 characteristic computing system water flow of water pump,
It can be by controlling real-time pressure difference and real time execution frequency between 1 inlet and outlet of water pump, it is ensured that system water flow is full
The minimum water flow being arranged enough, ensures the safe operation of system.
When building air conditioning load increases, end valve 5 is opened greatly, and system resistance reduces, and water flow increases, 1 water inlet of water pump
Pressure difference between water outlet reduces, and electronic by-passing valve 6 can be turned down constantly to completely closing at this time.When flow controller 12 detects
A period of time is remained off to electronic by-passing valve 6, then by flow controller 12 according to real-time pressure differential deltap P and preset pressure value
ΔP0Between difference, by pump variable frequency device 14 adjust water pump 1 running frequency, by the reality between water knockout drum 3 and water collector 4
When pressure differential deltap P maintain setting value Δ P0。
The foregoing is merely the better embodiments of the utility model, are not intended to limit the utility model, it is all
Within the spirit and principles of the utility model, it is new to should be included in this practicality for any modification, equivalent replacement, improvement and so on
Within the protection domain of type.
Claims (5)
1. an a kind of air conditioning water system vari- able flow control system comprising water pump (1), divides water at evaporator of refrigerator (2)
Device (3), water collector (4), end valve (5), electronic by-passing valve (6) and electronic by-pass valve actuator (7), water pump (1), water knockout drum
(3), end valve (5), water collector (4), evaporator of refrigerator (2) and water pump (1) are sequentially communicated to form water circulation channel, electronic
By-passing valve (6) is respectively communicated with water knockout drum (3) and water collector (4), it is characterised in that：Further include the first differential pressure pickup (8), second
Differential pressure pickup (9), flow controller (12) and pump variable frequency device (14), wherein
First differential pressure pickup (8) acquires the real-time pressure difference between water knockout drum (3) and water collector (4) and is sent to flow control
Device (12)；
Second differential pressure pickup (9) acquires the real-time pressure difference between water pump (1) inlet and outlet and is sent to flow control
Device (12)；
Flow controller (12) is connected separately the first differential pressure pickup (8), the second differential pressure pickup (9), electronic by-passing valve
Actuator (7) and pump variable frequency device (14) acquire real-time according to the first differential pressure pickup (8) and the second differential pressure pickup (9)
Pressure difference controls electronic by-pass valve actuator (7) and pump variable frequency device (14)；
Electronic by-pass valve actuator (7), connects electronic by-passing valve (6), controls its valve opening degree；
Pump variable frequency device (14), connection water pump (1), controls its running frequency.
2. air conditioning water system vari- able flow control system as described in claim 1, it is characterised in that：Further include light current
Switch board (10) and power switch unit (11), the flow controller (12) and power switch unit (11) are arranged in light current control
In cabinet (10) processed, power switch unit (11) is electrically connected flow controller (12) and is connect with power supply.
3. air conditioning water system vari- able flow control system as described in claim 1, it is characterised in that：It further include distribution
Cabinet (13) and power supply are spaced apart unit (15), and the pump variable frequency device (14) and power supply are spaced apart unit (15) and are arranged in power distribution cabinet (13)
In, power supply is spaced apart unit (15) and is electrically connected pump variable frequency device (14) and electrical source of power.
4. air conditioning water system vari- able flow control system as described in claim 1, it is characterised in that：The electronic side
Port valve (6) is set between water knockout drum (3) and water collector (4) on balance pipe.
5. air conditioning water system vari- able flow control system as described in claim 1, it is characterised in that：Flow controller
(12) according between water knockout drum (3) and water collector (4) real-time pressure difference and water pump (1) inlet and outlet between real-time pressure
Difference calculates the running frequency of water pump and electronic bypass valve opening, and pass through pump variable frequency device in conjunction with the characteristic that water pump (1) is run
(14) water pump (1) and electronic by-passing valve (6) are controlled with electronic by-pass valve actuator (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721807886.6U CN207688366U (en) | 2017-12-20 | 2017-12-20 | Air conditioning water system vari- able flow control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721807886.6U CN207688366U (en) | 2017-12-20 | 2017-12-20 | Air conditioning water system vari- able flow control system |
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| Publication Number | Publication Date |
|---|---|
| CN207688366U true CN207688366U (en) | 2018-08-03 |
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ID=62994577
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721807886.6U Active CN207688366U (en) | 2017-12-20 | 2017-12-20 | Air conditioning water system vari- able flow control system |
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| Country | Link |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108006928A (en) * | 2017-12-20 | 2018-05-08 | 武汉捷高技术有限公司 | Air conditioning water system vari- able flow control system and method |
| CN114484748A (en) * | 2022-01-26 | 2022-05-13 | 清华大学 | Air conditioner water system control method and device without differential pressure bypass valve |
-
2017
- 2017-12-20 CN CN201721807886.6U patent/CN207688366U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108006928A (en) * | 2017-12-20 | 2018-05-08 | 武汉捷高技术有限公司 | Air conditioning water system vari- able flow control system and method |
| CN114484748A (en) * | 2022-01-26 | 2022-05-13 | 清华大学 | Air conditioner water system control method and device without differential pressure bypass valve |
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