CN109945460A - A kind of air conditioning cooling water secondary pump variable volume system and control method - Google Patents
A kind of air conditioning cooling water secondary pump variable volume system and control method Download PDFInfo
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- CN109945460A CN109945460A CN201910244871.0A CN201910244871A CN109945460A CN 109945460 A CN109945460 A CN 109945460A CN 201910244871 A CN201910244871 A CN 201910244871A CN 109945460 A CN109945460 A CN 109945460A
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Abstract
The invention discloses a kind of air conditioning cooling water secondary pump variable volume systems, if it is characterized by comprising dry cooling towers in parallel, the water inlet end connection of cooling tower several end unit branches in parallel, the water outlet connection of cooling tower several valve branches in parallel, a valve branch return water to end unit branch, which is formed, to be recycled；It further include end-of-pipe control cabinet and cold source control cabinet, the flow for being respectively used to each end unit bypass flow adjusting and cooling tower, each valve branch is adjusted；By the way that secondary pump is respectively set on the branch road of each cooling water, each bypass flow is controlled, can satisfy demand of each branch to cooling water inflow；On the other hand, valve resistance is changed to secondary pump power, solves energy waste problem caused by water valve.
Description
Technical field
The invention belongs to building energy conservation and air-conditioner water system fields, and in particular to a kind of air conditioning cooling water secondary pump variable volume
System.
Background technique
With the continuous development of China's urbanization, key city population is more and more, to also promote subway and other
The construction of large public building.The air-conditioning system of large public building is complicated, huge, and the specific gravity in whole building energy consumption is also very
Greatly.In general, air-conditioning system operation energy consumption accounts for 60% or more whole building energy consumption, therefore air conditioner energy saving seems and becomes more and more important.It is large-scale
Central air conditioner system be mainly made of cooling water system, water cooler, chilled water system and wind system；Novel water-loop heat pump
Air-conditioning system, water source multi-gang air conditioner have cooling water system part, and become more and more multiple with the increase of system
It is miscellaneous.The main energy-consuming parts of air conditioning cooling water system include cooling tower and cooling water pump, and operation energy consumption is in entire air-conditioning system
In occupy important specific gravity.Therefore, a kind of good air conditioning cooling water system and its control method to the energy conservation of air-conditioning system and
System stabilization all has great importance.
In the prior art, air conditioning cooling water system is all made of constant-primary-flow system or primary pump variable flow water system pair
Cooling water focused on, transmission & distribution.For the cooling requirement for meeting refrigeration host computer condenser, which usually passes through outdoor wet bulb
The degree of approximation of temperature controls blower fan of cooling tower frequency conversion, primary pump (cooling water pump) frequency conversion is controlled by supply backwater temperature difference, to reach
To the purpose of energy-saving run.For the large size of more refrigeration host computers, more water-loop heat pump units, the water source Duo Tai combined air conditioners host
Air-conditioning system, demand of each unit to cooling water can only be realized by the balance of valve and pipe network on each branch pipe；Necessarily deposit
Be difficult to adjust on demand in cooling water flow, distribute unbalanced, the mixing temperature difference reduce, total flow overcurrent the problems such as, cause transmission & distribution energy
The larger waste of amount.In addition, valve opening, which reduces, to increase the resistance of pipe-line system since valve is a resistance component,
In the case of same traffic, the power consumption of water pump is increased；So controlling cooling water flow balance and a kind of energy by valve
Waste.
Summary of the invention
For at least one of prior art the above defects or improvement requirements, the present invention provides a kind of air conditioning cooling waters
Secondary pump variable volume system controls each bypass flow by the way that secondary pump is respectively set on the branch road of each cooling water, can
To meet the needs of each branch is to cooling water inflow；On the other hand, valve resistance is changed to secondary pump power, solves water valve and causes
Energy waste problem.
To achieve the above object, according to one aspect of the present invention, a kind of air conditioning cooling water secondary pump variable volume is provided
System, in which: if the water inlet end connection of cooling tower several end unit branches in parallel are cooling including dry cooling tower in parallel
The water outlet connection of tower several valve branches in parallel, a valve branch return water to end unit branch, which is formed, to be recycled；Also wrap
End-of-pipe control cabinet and cold source control cabinet are included, each end unit bypass flow is respectively used to and adjusts and cooling tower, each valve branch
Flow adjust；
Each valve branch road is provided with a valve, the first water valve；
Cooling water return pipe between cooling tower and a valve branch is equipped with the first temperature sensor；
Cooling water supply pipe between cooling tower and end unit branch is equipped with second pressure sensor；
Cooling water return pipe between valve branch and end unit branch is equipped with first pressure sensor, the 4th temperature
Spend sensor, first flow sensor；
Each end unit branch road is provided with secondary pump, second temperature sensor, second flow sensor, the second water
Valve；
Is provided on balance pipe between the cooling water supply pipe and cooling water return pipe at end unit branch both ends
Three water valves.
Preferably, each cooling tower includes blower fan of cooling tower, the water inlet end of each cooling tower branch be provided with the second water valve,
Water outlet is provided with the 5th water valve；
Preferably, air conditioning cooling water secondary pump variable volume system further includes being set to outdoor humidity sensor, third temperature
Spend sensor.
Preferably, cold source control cabinet includes the first power supply air switch, an apparatus for controlling pump, blower fan of cooling tower control dress
It sets, the first Water valve control device, the second Water valve control device, the 5th Water valve control device, a pump frequency conversion device, blower fan of cooling tower
Frequency converter, the first water valve actuator, the second water valve actuator, the 5th water valve actuator.
Preferably, the first temperature sensor, third temperature sensor, humidity sensor, first pressure sensor, the second pressure
Force snesor, third water valve, first flow sensor are electrically connected with cold source control cabinet, and temperature signal, moisture signal, pressure are believed
Number, water valve opening and closing signal, flow signal pass to blower fan of cooling tower control device in cold source control cabinet, an apparatus for controlling pump,
First Water valve control device, the second Water valve control device, the 5th Water valve control device；
Preferably, blower fan of cooling tower frequency converter, blower fan of cooling tower, the first water valve actuator, the second water valve actuator, the 5th
Water valve actuator is electrically connected with cold source control cabinet；Blower fan of cooling tower frequency converter receives the control signal of fan controller output,
Control the frequency conversion of blower fan of cooling tower；
Preferably, a pump frequency conversion device receives the control signal of apparatus for controlling pump output, controls the frequency conversion once pumped；
Preferably, the first water valve actuator receives the control signal of the first Water valve control device output, controls opening for water valve
It closes；
Preferably, the second water valve actuator receives the control signal of the second Water valve control device output, controls the second water valve
Switch；
Preferably, the 5th water valve actuator receives the control signal of the 5th Water valve control device output, controls opening for water valve
It closes；
Preferably, the power input of the first power supply air switch control each component of main control cabinet.
Preferably, end-of-pipe control cabinet includes second source air switch, secondary apparatus for controlling pump, third water valve control dress
It sets, the 4th Water valve control device, secondary pump frequency converter, third water valve actuator, the 4th water valve actuator；
Preferably, second temperature sensor, second flow sensor, the 4th temperature sensor, first flow sensor with
The electrical connection of end-of-pipe control cabinet, passes to secondary apparatus for controlling pump in end-of-pipe control cabinet, third water valve for temperature signal, flow signal
Control device, the 4th Water valve control device；
Preferably, secondary pump frequency converter, the second water valve, third water valve are electrically connected with end-of-pipe control cabinet；Secondary pump frequency converter
The control signal for receiving secondary apparatus for controlling pump output, controls the frequency conversion of secondary pump；
Preferably, third water valve actuator receives the control signal of third Water valve control device output, controls the second water valve
Switch；
Preferably, the 4th water valve actuator receives the control signal of the 4th Water valve control device output, controls third water valve
Switch；
Preferably, the power input of second source air switch control each component of main control cabinet.
To achieve the above object, it is another aspect of this invention to provide that additionally providing a kind of air conditioning cooling water as the aforementioned two
The control method of secondary pump variable flow system, in which:
When system starts, after one or more end units receive run signal, branch road where opening the end unit
The second water valve and balance pipe on third water valve, the secondary pump of branch road where delay scheduled time opens end unit；It opens
The first water valve for opening the second water valve of cooling tower water inlet end and the 5th water valve of water outlet, once pumping, delay scheduled time, and
After third water valve on confirmation balance pipe reaches position, primary pump is opened；The of second water valve of cooling tower water inlet end and water outlet
After five water valves reach position, start blower fan of cooling tower；Open the end unit for needing to run and corresponding chilled water system.
Preferably, when system stops, running end unit is closed, delay scheduled time is closed blower fan of cooling tower, prolonged
The slow predetermined time closes primary pump and secondary pump, and delay scheduled time closes chilled water system, after confirmation secondary pump is closed, closes
The second water valve for closing branch road, after the primary pump of confirmation is closed, close cooling tower water inlet end the second water valve and water outlet the
Five water valves, the first water valve once pumped.
Preferably, when system works, end-of-pipe control cabinet receives the second temperature sensing on branch pipe where being set to secondary pump
The temperature signal of the 4th temperature sensor on device, cooling water return pipe, calculates supply backwater temperature difference, and secondary apparatus for controlling pump is defeated
Signal is controlled out, is controlled by running frequency of the secondary pump frequency converter to secondary pump；It is set when branch pipe supply backwater temperature difference is higher than
Definite value, after continuously meeting the condition predetermined time, secondary pump running frequency improves predetermined value；When place, branch pipe supply backwater temperature difference is low
In setting value, after continuously meeting the condition predetermined time, secondary pump running frequency reduces predetermined value.
Preferably, system work when, cold source control cabinet receive be set in cooling water return pipe first pressure sensor,
The pressure signal of second pressure sensor on cooling water supply pipe is calculated for return water pressure difference, an apparatus for controlling pump output control
Signal processed controls the running frequency once pumped by a pump frequency conversion device；When being higher than setting value for return water pressure difference, continuously
After meeting the condition predetermined time, one time pump operation frequency improves predetermined value；When being lower than setting value for return water pressure difference, continuously meet
After the condition predetermined time, one time pump operation frequency reduces predetermined value.
Preferably, when system works, cold source control cabinet receives the first flow sensor being set in cooling water return pipe
Flow signal, be compared with preset multiple flow values, apparatus for controlling pump output control signal, by once pumping change
Frequency device controls the start and stop once pumped；If total cooling water inflow is greater than preset value, continuously meet the condition predetermined time
Afterwards, increase a pump operation, while interlocking and opening first water valve once pumped；If total cooling water inflow is less than preset value
When, close a primary pump, while interlocking close first water valve once pumped；
Preferably, when system works, cold source control cabinet receive to be set to the temperature signal of outdoor third temperature sensor,
The temperature signal of the moisture signal of humidity sensor, the first temperature sensor being set on cooling tower outlet pipe, calculates most
Excellent cooling tower leaving water temperature, optimal cooling tower leaving water temperature are equal to outdoor air wet bulb temperature and add predetermined value, calculate cooling tower
Leaving water temperature and optimal cooling tower leaving water temperature difference, blower fan of cooling tower control device output control signal, pass through cooling tower wind
Machine frequency converter controls the running frequency of blower fan of cooling tower；When difference be higher than setting value, continuously meet the pre- timing of the condition
Between after, blower fan of cooling tower running frequency improve predetermined value；When difference is lower than setting value, after continuously meeting the condition predetermined time,
Blower fan of cooling tower running frequency reduces predetermined value, and all blower fan of cooling tower use frequency people having the same aspiration and interest mode；When cooling tower goes out water temperature
When degree is lower than setting value, blower fan of cooling tower is all closed；
Preferably, when system works, end-of-pipe control cabinet receives the stream of the first flow sensor of branch road where being set to
Signal is measured, secondary apparatus for controlling pump output control signal is controlled by running frequency of the secondary pump frequency converter to secondary pump；
When the flow of place branch road is lower than setting value, secondary pump running frequency improves predetermined value.
Above-mentioned preferred feature can be combined with each other as long as they do not conflict with each other.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, have below beneficial to effect
Fruit:
1, air conditioning cooling water secondary pump variable volume system of the invention, replaces end water valve for secondary pump, utilizes water pump
The flow on branch pipe is adjusted in power, eliminates the local resistance of end water valve, especially in direct return system, avoids
Proximal end water valve bring energy consumption, while reducing the lift once pumped, it has been finally reached and has reduced distributing system power consumption
Purpose.On the other hand, which carries out variable frequency adjustment and unit number control to water pump, overcomes small temperature in distributing system
The drawbacks of poor big yield, further reduced the power consumption of distributing system；Meanwhile according to out door climatic parameter, determine optimal cold
But tower leaving water temperature carries out variable frequency adjustment to blower fan of cooling tower, and improves the refrigeration performance of end unit, so that system is in
It is run in the state of more energy saving.Simultaneously with this, be utilized respectively on main pipe in return water pressure difference, end branch for return water temperature
Difference, cooling water return water temperature respectively control primary pump, secondary pump and blower fan of cooling tower, ensure that the accurate of control strategy
Property and timeliness.
2, air conditioning cooling water secondary pump variable volume system of the invention, the diversification of end unit pattern, can be water-cooled
A variety of water-cooling type units such as water cooler, water-cooled packaged air-conditioner, water-loop heat pump unit, water source combined air conditioners host have extensive
Applicability.
3, air conditioning cooling water secondary pump variable volume system of the invention carries out the flow on branch pipe using the power of water pump
It adjusts, is able to satisfy each end to the dynamic need of cooling water inflow, meanwhile, the local resistance of end water valve is eliminated, is especially existed
In direct return system, proximal end water valve bring energy consumption is avoided, and reduce the lift once pumped, be finally reached reduction
The purpose of distributing system power consumption.
4, air conditioning cooling water secondary pump variable volume system of the invention, primary pump, secondary pump use variable frequency adjustment and number of units
The drawbacks of controlling, overcoming small temperature difference big yield in distributing system, further reduced the power consumption of distributing system.
5, air conditioning cooling water secondary pump variable volume system of the invention determines optimal cooling according to out door climatic parameter
Tower leaving water temperature carries out variable frequency adjustment to blower fan of cooling tower, and improves the refrigeration performance of end unit, so that system is in more
It is run in the state of supernumerary segment energy.
6, air conditioning cooling water secondary pump variable volume system of the invention, is arranged temperature sensor on the unit pipeline of end,
Temperature sensor is set on cooling tower outlet pipe, pressure sensor is set on for return water main pipe, is utilized respectively end branch
On supply backwater temperature difference, for return water pressure difference and cooling water return water temperature primary pump, secondary pump and blower fan of cooling tower are carried out respectively
Control, ensure that the accuracy and timeliness of control method.
In conclusion a kind of air conditioning cooling water secondary pump variable volume system of the invention, end unit pattern has multiplicity
Change, there is wide applicability；The method and converter technique for replacing valve to be adjusted using secondary pump, reduce distributing system
Power consumption；Optimal cooling tower leaving water temperature is determined according to out door climatic parameter, improves the refrigeration performance of end unit, so that being
System is run in the state of being in more energy saving；Meanwhile each equipment is controlled using independent parameter, it ensure that control method
Accuracy and timeliness；Air conditioning cooling water secondary pump variable volume system and its control method have wide applicability, apparent
Technical advance, significant economy and very strong practicability, will possess wide market application prospect.
Detailed description of the invention
Fig. 1 is the schematic illustration of air conditioning cooling water secondary pump variable volume system of the invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.The present invention is described in more detail With reference to embodiment.
As a kind of better embodiment of the invention, as shown in Figure 1, the present invention provides a kind of air conditioning cooling water secondary pump
Variable flow system includes primary pump 1, the first water valve 3, the first temperature sensor 4, blower fan of cooling tower 5, the second water valve 7, the first pressure
Force snesor 8, second pressure sensor 9, third water valve 10, cold source control cabinet 11, second temperature sensor 15, secondary pump 17,
Second water valve 19, end-of-pipe control cabinet 21, humidity sensor 22, third temperature sensor 23, the 5th water valve 32, the 4th temperature sensing
Device 35, second flow sensor 36, first flow sensor 37.
Cold source control cabinet 11 includes the first power supply air switch 12, an apparatus for controlling pump 13, blower fan of cooling tower control dress
Set 14, the first Water valve control device 24, the second Water valve control device 25, the 5th Water valve control device 33, a pump frequency conversion device 2,
Blower fan of cooling tower frequency converter 6, the first water valve actuator 26, the second water valve actuator 27, the 5th water valve actuator 34.
End-of-pipe control cabinet 21 includes second source air switch 18, secondary apparatus for controlling pump 20, third Water valve control device
28, the 4th Water valve control device 30, secondary pump frequency converter 16, third water valve actuator 29, the 4th water valve actuator 31.
In cold source control cabinet 11, the first temperature sensor 4, third temperature sensor 23, humidity sensor 22, first are pressed
Force snesor 8, second pressure sensor 9, third water valve 10, first flow sensor 37 are electrically connected with cold source control cabinet 11, will
Temperature signal, moisture signal, pressure signal, water valve opening and closing signal, flow signal pass to cooling tower wind in cold source control cabinet 11
14, apparatus for controlling pump 13 of machine control device, the first Water valve control device 24, the second Water valve control device 25, the 5th water valve
Control device 33.Blower fan of cooling tower frequency converter 6, blower fan of cooling tower 5, the first water valve actuator 26, the second water valve actuator 27,
Five water valve actuators 34 are electrically connected with cold source control cabinet 11.Blower fan of cooling tower frequency converter 6 receives the output of fan controller 14
Signal is controlled, the frequency conversion of blower fan of cooling tower 5 is controlled.Pump frequency conversion device 2 receives the control letter that an apparatus for controlling pump 13 exports
Number, the frequency conversion of primary pump 1 is controlled, the first water valve actuator 26 receives the control signal of the first Water valve control device 24 output, control
The switch of gate valve 3, the second water valve actuator 27 receive the control signal of the second Water valve control device 25 output, control the second water
The switch of valve 7, the 5th water valve actuator 34 receive the control signal of the 5th Water valve control device 33 output, and control water valve 32 is opened
It closes.The power input of the first power supply air switch 12 control each component of main control cabinet 11.
In end-of-pipe control cabinet 21, second temperature sensor 15, second flow sensor 36, the 4th temperature sensor 35,
First flow sensor 37 is electrically connected with end-of-pipe control cabinet 21, and temperature signal, flow signal are passed in end-of-pipe control cabinet 21
Secondary apparatus for controlling pump 20, third Water valve control device 28, the 4th Water valve control device 30.Secondary pump frequency converter 16, the second water
Valve 19, third water valve 10 are electrically connected with end-of-pipe control cabinet 21.Secondary pump frequency converter 16 receives what secondary apparatus for controlling pump 20 exported
Signal is controlled, the frequency conversion of secondary pump 17 is controlled, third water valve actuator 29 receives the control of the output of third Water valve control device 28
Signal, controls the switch of the second water valve 19, and the 4th water valve actuator 31 receives the control letter of the 4th Water valve control device 30 output
Number, control the switch of third water valve 10.The power input of the control each component of main control cabinet 21 of second source air switch 18.
Its specific control method is as follows:
One, when device starts, after one or more end units receive run signal, branch where the end unit is opened
On the second water valve 19 and balance pipe on third water valve 10, delay certain time (default 1s) opens branch where the unit of end
On secondary pump 17.Open the second water valve 7 of cooling tower water inlet end and the 5th water valve 32 of water outlet, the first water valve for once pumping
3, delay certain time (default 1s), and after the third water valve 10 on confirmation balance pipe reaches position, open primary pump 1.It is cooling
After second water valve 7 of tower water inlet end and the 5th water valve 32 of water outlet reach position, start blower fan of cooling tower 5.Unlatching needs to run
End unit and corresponding chilled water system.
Two, when device stops, running end unit is closed, delay certain time (default 10s) closes cooling tower wind
Machine 5, delay certain time (default 180s) close primary pump 1 and secondary pump 17, and delay certain time (default 120s) is closed cold
Freeze water system, after confirmation secondary pump 17 is closed, close the second water valve 19 of branch road, after the primary pump 1 of confirmation is closed, closes
Second water valve 7 of cooling tower water inlet end and the 5th water valve 32 of water outlet, the first water valve 3 once pumped.
Three, when device works, end-of-pipe control cabinet 21 receives the second temperature sensor on branch pipe where being set to secondary pump
15, the temperature signal of the 4th temperature sensor 35 in cooling water return pipe calculates supply backwater temperature difference, secondary apparatus for controlling pump
20 output control signals, are controlled by running frequency of the secondary pump frequency converter 16 to secondary pump 17.When branch pipe is for return water temperature
Difference is higher than setting value (5.5 DEG C of default), and after continuously meeting the condition certain time (default 20s), 17 running frequency of secondary pump is mentioned
High certain value (default 0.5Hz)；When place branch pipe supply backwater temperature difference is lower than setting value (default 4.5 DEG C), continuously meet the condition
After certain time (default 20s), 17 running frequency of secondary pump reduces certain value (default 0.5Hz).
Four, device work when, cold source control cabinet 11 receive be set in cooling water return pipe first pressure sensor 8,
The pressure signal of second pressure sensor 9 on cooling water supply pipe is calculated for return water pressure difference, and one time apparatus for controlling pump 13 exports
Signal is controlled, is controlled by running frequency of the pump frequency conversion device 2 to primary pump 1.When for return water pressure difference be higher than setting value
(default 5Pa), after continuously meeting the condition certain time (default 20s), primary 1 running frequency that pumps improves certain value (default
0.5Hz)；When being lower than setting value (default -5Pa) for return water pressure difference, after continuously meeting the condition certain time (default 20s), one
1 running frequency of secondary pump reduces certain value (default 0.5Hz).
Five, when device works, cold source control cabinet 11 receives the first flow sensor 37 being set in cooling water return pipe
Flow signal, be compared with preset multiple flow values (such as preset value is descending to be followed successively by m1, m2, m3 ... mn, respectively
The water supply capacity that one corresponding, Liang Tai, three ... n platforms once pump), an output control signal of apparatus for controlling pump 13 passes through one
Secondary pump frequency conversion device 2 controls the start and stop of primary pump 1.If total cooling water inflow is greater than some preset values (such as only two
Platform once pumps in the case where operation, it has been more than two water supply capacities once pumped that total cooling water inflow, which is greater than m2) when, continuously
After meeting the condition certain time (default 20s), increase primary 1 operation of pump, at the same interlock open this once pump first
Water valve 3.If total cooling water inflow is less than some preset values, (for example only two primary pumps are in the case where operation, total cooling water
Amount is less than m1, i.e., one primary pump is just able to satisfy water supply requirement) when, close a primary pump 1, while the interlocking close primary pump
The first water valve 3.
Six, when device works, cold source control cabinet 11 receive to be set to the temperature signal of outdoor third temperature sensor 23,
The temperature signal of the moisture signal of humidity sensor 22, the first temperature sensor 4 being set on cooling tower outlet pipe, calculates
Optimal cooling tower leaving water temperature, optimal cooling tower leaving water temperature are equal to outdoor air wet bulb temperature and add certain value (2.5 DEG C of default),
Calculate cooling tower leaving water temperature and optimal cooling tower leaving water temperature difference, the output control letter of blower fan of cooling tower control device 14
Number, it is controlled by running frequency of the blower fan of cooling tower frequency converter 6 to blower fan of cooling tower 5.When difference is higher than setting value (default
0.5 DEG C), after continuously meeting the condition certain time (default 10s), 5 running frequency of blower fan of cooling tower improves certain value (default
5Hz)；Difference is lower than setting value (- 0.5 DEG C of default), after continuously meeting the condition certain time (default 20s), blower fan of cooling tower 5
Running frequency reduces certain value (default 5Hz), and all blower fan of cooling tower 5 use frequency people having the same aspiration and interest mode.When cooling tower goes out water temperature
When degree is lower than setting value (18 DEG C of default), blower fan of cooling tower 5 is all closed.
Seven, when device works, end-of-pipe control cabinet 21 receives the stream of the first flow sensor 37 of branch road where being set to
Measure signal, secondary apparatus for controlling pump 20 output control signal, by secondary pump frequency converter 16 to the running frequency of secondary pump 17 into
Row control.It is secondary when the flow of place branch road is lower than a certain setting value (be defaulted as end unit metered flow 50%)
It pumps 17 running frequencies and improves certain value (default 0.5Hz).
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (10)
1. a kind of air conditioning cooling water secondary pump variable volume system, it is characterised in that: if including dry cooling tower in parallel, cooling tower
Water inlet end connection several end unit branches in parallel, the water outlet connection of cooling tower several valve branches in parallel, once
Valve branch return water is formed to end unit branch and is recycled；Further include end-of-pipe control cabinet and cold source control cabinet, is respectively used to each end
Unit bypass flow adjusts and the flow of cooling tower, each valve branch is adjusted；
Each valve branch road is provided with a valve, the first water valve；
Cooling water return pipe between cooling tower and a valve branch is equipped with the first temperature sensor；
Cooling water supply pipe between cooling tower and end unit branch is equipped with second pressure sensor；
Cooling water return pipe between valve branch and end unit branch is equipped with first pressure sensor, the 4th temperature passes
Sensor, first flow sensor；
Each end unit branch road is provided with secondary pump, second temperature sensor, second flow sensor, the second water valve；
Third water is provided on balance pipe between the cooling water supply pipe and cooling water return pipe at end unit branch both ends
Valve.
2. air conditioning cooling water secondary pump variable volume system as described in claim 1, it is characterised in that:
Each cooling tower includes blower fan of cooling tower, and the water inlet end of each cooling tower branch is provided with the second water valve, water outlet setting
There is the 5th water valve；
Preferably, air conditioning cooling water secondary pump variable volume system further includes being set to outdoor humidity sensor, third temperature biography
Sensor.
3. air conditioning cooling water secondary pump variable volume system as claimed in claim 2, it is characterised in that:
Cold source control cabinet includes the first power supply air switch, an apparatus for controlling pump, blower fan of cooling tower control device, the first water valve
Control device, the second Water valve control device, the 5th Water valve control device, a pump frequency conversion device, blower fan of cooling tower frequency converter, first
Water valve actuator, the second water valve actuator, the 5th water valve actuator.
4. air conditioning cooling water secondary pump variable volume system as claimed in claim 3, it is characterised in that:
First temperature sensor, third temperature sensor, humidity sensor, first pressure sensor, second pressure sensor,
Three water valves, first flow sensor are electrically connected with cold source control cabinet, and temperature signal, moisture signal, pressure signal, water valve are opened and closed
Signal, flow signal pass to blower fan of cooling tower control device in cold source control cabinet, an apparatus for controlling pump, the control of the first water valve
Device, the second Water valve control device, the 5th Water valve control device；
Preferably, blower fan of cooling tower frequency converter, blower fan of cooling tower, the first water valve actuator, the second water valve actuator, the 5th water valve
Actuator is electrically connected with cold source control cabinet；Blower fan of cooling tower frequency converter receives the control signal of fan controller output, control
The frequency conversion of blower fan of cooling tower；
Preferably, a pump frequency conversion device receives the control signal of apparatus for controlling pump output, controls the frequency conversion once pumped；
Preferably, the first water valve actuator receives the control signal of the first Water valve control device output, controls the switch of water valve；
Preferably, the second water valve actuator receives the control signal of the second Water valve control device output, and the second water valve of control is opened
It closes；
Preferably, the 5th water valve actuator receives the control signal of the 5th Water valve control device output, controls the switch of water valve；
Preferably, the power input of the first power supply air switch control each component of main control cabinet.
5. air conditioning cooling water secondary pump variable volume system as claimed in claim 4, it is characterised in that:
End-of-pipe control cabinet includes second source air switch, secondary apparatus for controlling pump, third Water valve control device, the 4th water valve control
Device processed, secondary pump frequency converter, third water valve actuator, the 4th water valve actuator；
Preferably, second temperature sensor, second flow sensor, the 4th temperature sensor, first flow sensor and end
Temperature signal, flow signal are passed to secondary apparatus for controlling pump in end-of-pipe control cabinet by control cabinet electrical connection, third water valve controls
Device, the 4th Water valve control device；
Preferably, secondary pump frequency converter, the second water valve, third water valve are electrically connected with end-of-pipe control cabinet；Secondary pump frequency converter receives
The control signal of secondary apparatus for controlling pump output, controls the frequency conversion of secondary pump；
Preferably, third water valve actuator receives the control signal of third Water valve control device output, and the second water valve of control is opened
It closes；
Preferably, the 4th water valve actuator receives the control signal of the 4th Water valve control device output, and control third water valve is opened
It closes；
Preferably, the power input of second source air switch control each component of main control cabinet.
6. a kind of control method of air conditioning cooling water secondary pump variable volume system as described in any one in claim 1-5, special
Sign is:
When system starts, after one or more end units receive run signal, the of branch road where opening end unit
Third water valve on two water valves and balance pipe, the secondary pump of branch road where delay scheduled time opens end unit；It opens cold
But the second water valve of tower water inlet end and the 5th water valve of water outlet, the first water valve once pumped, delay scheduled time, and confirming
After third water valve on balance pipe reaches position, primary pump is opened；Second water valve of cooling tower water inlet end and the 5th water of water outlet
After valve reaches position, start blower fan of cooling tower；Open the end unit for needing to run and corresponding chilled water system.
7. the control method of air conditioning cooling water secondary pump variable volume system as claimed in claim 6, it is characterised in that:
When system stops, running end unit is closed, delay scheduled time closes blower fan of cooling tower, and delay scheduled time closes
Primary pump and secondary pump are closed, delay scheduled time closes chilled water system, after confirmation secondary pump is closed, closes the of branch road
Two water valves close the second water valve of cooling tower water inlet end and the 5th water valve of water outlet, primary pump after the primary pump of confirmation is closed
The first water valve.
8. the control method of air conditioning cooling water secondary pump variable volume system as claimed in claim 6, it is characterised in that:
When system works, end-of-pipe control cabinet receives the second temperature sensor being set on the branch pipe of secondary pump place, cooling water returns
The temperature signal of the 4th temperature sensor on water pipe calculates supply backwater temperature difference, and secondary apparatus for controlling pump output controls signal,
It is controlled by running frequency of the secondary pump frequency converter to secondary pump；It is continuous full when branch pipe supply backwater temperature difference is higher than setting value
After the foot condition predetermined time, secondary pump running frequency improves predetermined value；When place branch pipe supply backwater temperature difference is lower than setting value, company
Continue after meeting the condition predetermined time, secondary pump running frequency reduces predetermined value.
9. the control method of air conditioning cooling water secondary pump variable volume system as claimed in claim 6, it is characterised in that:
When system works, cold source control cabinet receives the first pressure sensor being set in cooling water return pipe, cooling water
The pressure signal of second pressure sensor on pipe is calculated for return water pressure difference, and an apparatus for controlling pump output control signal passes through
One time pump frequency conversion device controls the running frequency once pumped；When being higher than setting value for return water pressure difference, continuously meet the condition
After predetermined time, one time pump operation frequency improves predetermined value；When being lower than setting value for return water pressure difference, it is predetermined continuously to meet the condition
After time, one time pump operation frequency reduces predetermined value.
10. the control method of air conditioning cooling water secondary pump variable volume system as claimed in claim 6, it is characterised in that:
When system works, cold source control cabinet receives the flow signal for the first flow sensor being set in cooling water return pipe,
It is compared with preset multiple flow values, an apparatus for controlling pump output control signal, by a pump frequency conversion device to primary
The start and stop of pump are controlled；If total cooling water inflow is greater than preset value, after continuously meeting the condition predetermined time, increase by one
Pump operation, while interlocking and opening first water valve once pumped；If total cooling water inflow is less than preset value, one is closed
Primary pump, while interlocking close first water valve once pumped；
Preferably, when system works, cold source control cabinet receives the temperature signal, the humidity that are set to outdoor third temperature sensor
The temperature signal of the moisture signal of sensor, the first temperature sensor being set on cooling tower outlet pipe calculates optimal cold
But tower leaving water temperature, optimal cooling tower leaving water temperature are equal to outdoor air wet bulb temperature and add predetermined value, calculate cooling tower water outlet
Temperature and optimal cooling tower leaving water temperature difference, blower fan of cooling tower control device output control signal, are become by blower fan of cooling tower
Frequency device controls the running frequency of blower fan of cooling tower；When difference is higher than setting value, after continuously meeting the condition predetermined time,
Blower fan of cooling tower running frequency improves predetermined value；When difference is lower than setting value, after continuously meeting the condition predetermined time, cooling tower
Fan operation frequency reduces predetermined value, and all blower fan of cooling tower use frequency people having the same aspiration and interest mode；When cooling tower leaving water temperature is lower than
When setting value, blower fan of cooling tower is all closed；
Preferably, when system works, end-of-pipe control cabinet receives the flow letter of the first flow sensor of branch road where being set to
Number, secondary apparatus for controlling pump output control signal is controlled by running frequency of the secondary pump frequency converter to secondary pump；Work as institute
When the flow on branch road is lower than setting value, secondary pump running frequency improves predetermined value.
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