CN107514755A - The water pump start-up and shut-down control method and air-conditioning system of air-conditioning system - Google Patents
The water pump start-up and shut-down control method and air-conditioning system of air-conditioning system Download PDFInfo
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- CN107514755A CN107514755A CN201710761762.7A CN201710761762A CN107514755A CN 107514755 A CN107514755 A CN 107514755A CN 201710761762 A CN201710761762 A CN 201710761762A CN 107514755 A CN107514755 A CN 107514755A
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Abstract
The present invention relates to air-conditioning technical field, the water pump start-up and shut-down control method and air-conditioning system of more particularly to a kind of air-conditioning system.Control method provided by the present invention includes：Step S1, there is provided including heat exchanger and for pumping the air-conditioning system of the pump group to be exchanged heat at chilled water to heat exchanger, pump group includes two water pumps being connected in parallel to each other, and water pump determines according to running on the lower load type selecting；With step S2, according to the start and stop of the leaving water temperature of chilled water and disengaging water temperature difference two water pumps of control.The present invention is by selecting two water pumps in parallel according to running on the lower load, and the start and stop of two water pumps are controlled with disengaging water temperature difference according to the leaving water temperature of chilled water, single water pump can be avoided long-term use of, and the problem of preventing low load with strong power, therefore, energy consumption can be reduced with effectively save cost, extend the service life of water pump.
Description
Technical field
The present invention relates to air-conditioning technical field, the water pump start-up and shut-down control method of more particularly to a kind of air-conditioning system and air-conditioning system
System.
Background technology
Air-conditioning system is generally required for configuring power-equipment of the water pump as Hydraulic Circulation, in use, by controlling water pump
To control the quantity delivered of chilled water.
In the prior art, the control mode of the water pump generally use " the using and the reserved " of air-conditioning.In this fashion, two water
Parallel connection of pumps is set, and is during use, to open water in parallel for a long time according to water-carrying capacity during maximum load and lift come type selecting
One in pump, an other water pump only can be just opened when fault of water pump or the damage of unlatching.This control mode, due to
Long-term use of single water pump, therefore, can reduce the service life of water pump, also, for underload or partial load condition, water pump
The situation of low load with strong power occurs, increases operating cost, causes energy waste.
The content of the invention
The present invention is intended to provide the water pump start-up and shut-down control method and sky of the air-conditioning system that a kind of cost is relatively low and energy consumption is less
Adjusting system.
To achieve these goals, first aspect present invention provides a kind of water pump control method of air-conditioning system, and it is wrapped
Include：
Step S1, there is provided including heat exchanger and for pumping the air-conditioning system of the pump group to be exchanged heat at chilled water to heat exchanger
System, pump group include two water pumps being connected in parallel to each other, and water pump determines according to running on the lower load type selecting；
Step S2, the start and stop of two water pumps are controlled according to the leaving water temperature of chilled water and disengaging water temperature difference.
Alternatively, in step s 2, according to leaving water temperature and F2Magnitude relationship and disengaging water temperature difference and F1And F3It is big
Small relation controls the start and stop of two water pumps；
Wherein, F1For underload when setting pass in and out water temperature difference, F2Setting disengaging when switching for shoulder load list double water pump
Water temperature difference, F3For high load capacity when setting pass in and out water temperature difference.
Alternatively, F1＜ F3。
Alternatively, F1＜ F2＜ F3。
Alternatively, when air-conditioning system is in refrigerating state, step S2 also includes：
As leaving water temperature≤F2lWhen, two water pumps are opened；And/or
As leaving water temperature ＞ F2lWhen, according to disengaging water temperature difference and F1lAnd F3lMagnitude relationship control opening for two water pumps
Stop；
Wherein, F1lF during refrigerating state is in for air-conditioning system1, F2lF during refrigerating state is in for air-conditioning system2, F3l
F during refrigerating state is in for air-conditioning system3。
Alternatively, when air-conditioning system is in refrigerating state and leaving water temperature ＞ F2lWhen, step S2 also includes in following three
It is at least one：
If pass in and out water temperature difference ＜ F1l, then control one or two water pumps are closed down；
If pass in and out water temperature difference ＞ F3l, then two water pumps are controlled to open；
If F1l≤ disengaging water temperature difference≤F3l, then two water pumps are controlled to retain laststate.
Alternatively, when air-conditioning system is in heating state, step S2 also includes：
As leaving water temperature≤F2rWhen, according to disengaging water temperature difference and F1rAnd F3rMagnitude relationship control opening for two water pumps
Stop；And/or
As leaving water temperature ＞ F2rWhen, two water pumps are opened；
Wherein, F1rF during heating state is in for air-conditioning system1, F2rF during heating state is in for air-conditioning system2, F3r
F during heating state is in for air-conditioning system3。
Alternatively, when air-conditioning system is in heating state and leaving water temperature≤F2rWhen, step S2 also includes in following three
It is at least one：
If pass in and out water temperature difference ＜ F1r, then control one or two water pumps are closed down；
If pass in and out water temperature difference ＞ F3r, then two water pumps are controlled to open；
If F1r≤ disengaging water temperature difference≤F3r, then two water pumps are controlled to retain laststate.
Second aspect of the present invention additionally provides a kind of air-conditioning system, and it includes heat exchanger and for pumping chilled water to heat exchange
The pump group to be exchanged heat at device, pump group include two water pumps being connected in parallel to each other, and water pump determines according to running on the lower load type selecting.
Alternatively, air-conditioning system also includes control device, the leaving water temperature and disengaging that control device can be according to chilled water
Water temperature difference controls the start and stop of two water pumps.
The present invention according to the leaving water temperature of chilled water and is entered by selecting two water pumps in parallel according to running on the lower load
Temperature difference of outlet water controls the start and stop of two water pumps, and it is with the actually required water of air-conditioning system consistent can to improve water pump supply water
Property, the possibility for low load with strong power phenomenon occur is reduced, therefore, cost is relatively low, and energy consumption is less.Also, because two water pumps can
With reasonable start and stop according to the actual requirements, without long-term use of single water pump, therefore, it helps extend the service life of water pump,
Make air-conditioning system that there is more excellent performance.
Air-conditioning system is additionally, since generally to be provided with detection leaving water temperature in itself and pass in and out the device of water temperature difference, therefore, this
Invention controls the start and stop of two water pumps according to the leaving water temperature and disengaging water temperature difference of chilled water, without extra increase temperature inspection
Device is surveyed, so, control the mode of water pump start and stop to also need to the extra situation that flowmeter is set, this hair with respect to flow
Bright control method additionally aids the structure of simplified air-conditioning system, reduces the cost of air-conditioning system, improves the work of air-conditioning system
Reliability.
By referring to the drawings to the present invention exemplary embodiment be described in detail, further feature of the invention and
Its advantage will be made apparent from.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also
To obtain other accompanying drawings according to these accompanying drawings.
Fig. 1 shows the fundamental diagram of air-conditioning system water pump.
Fig. 2 shows the schematic flow sheet of control method of the present invention.
In figure：
1st, water pump；2nd, heat exchanger.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.Below
Description only actually at least one exemplary embodiment is illustrative, is never used as to the present invention and its application or makes
Any restrictions.Based on the embodiment in the present invention, those of ordinary skill in the art are in no development creative work premise
Lower obtained every other embodiment, belongs to the scope of protection of the invention.
It may be not discussed in detail for technology, method and apparatus known to person of ordinary skill in the relevant, but suitable
In the case of, the technology, method and apparatus should be considered as authorizing part for specification.
In the description of the invention, it is to be understood that the noun of locality such as " forward and backward, upper and lower, left and right ", " laterally, vertical,
Vertically, orientation or position relationship indicated by level " and " top, bottom " etc. are normally based on orientation or position shown in the drawings and closed
System, it is for only for ease of the description present invention and simplifies description, in the case where not making opposite explanation, these nouns of locality do not indicate that
There must be specific orientation with the device or element for implying meaning or with specific azimuth configuration and operation, therefore can not manage
Solve as limiting the scope of the invention；The noun of locality " inside and outside " refers to relative to inside and outside each part profile in itself.
In the description of the invention, it is to be understood that limit parts using the word such as " first ", " second ", only
It is for only for ease of and corresponding parts is distinguished, does not such as have Stated otherwise, above-mentioned word does not have particular meaning, therefore not
It is understood that as limiting the scope of the invention.
Fig. 1 shows the fundamental diagram of air-conditioning system water pump, and wherein arrow represents the flow direction of chilled water.Such as Fig. 1
Shown, air-conditioning system includes heat exchanger 2 and pump group, and pump group includes two water pumps 1, and two water pumps 1 are connected in parallel to each other, for that will freeze
Water pump is delivered to heat exchanger 2 and exchanged heat.Wherein, the chilled water for flowing to the import of water pump 1 is referred to as intaking, and is flowed out from heat exchanger 2 cold
Freeze water and be referred to as water outlet.Correspondingly, temperature when chilled water being flowed into water pump 1 is referred to as inflow temperature, and chilled water is flowed from heat exchanger 2
Temperature when going out is referred to as leaving water temperature, and the inflow temperature of chilled water and the absolute value of the difference of leaving water temperature are referred to as passing in and out water temperature
Difference, i.e. leaving water temperature refer to chilled water from heat exchanger 2 flow out when temperature, pass in and out water temperature difference and refer to the inflow temperature of chilled water
And the absolute value of the difference of leaving water temperature, inflow temperature refer to temperature when chilled water flows into water pump 1.
Fig. 2 shows the schematic flow sheet of control method of the present invention.As shown in Fig. 2 air-conditioning system provided by the present invention
Water pump start-up and shut-down control method, including：
Step S1, there is provided including heat exchanger 2 and for pumping the air-conditioning of the pump group to be exchanged heat at chilled water to heat exchanger 2
System, pump group include two water pumps 1 being connected in parallel to each other, and water pump 1 determines according to running on the lower load type selecting；
Step S2, the start and stop of two water pumps 1 are controlled according to the leaving water temperature of chilled water and disengaging water temperature difference.
Wherein, running on the lower load is to be different from high load capacity operating mode and a kind of operating mode of nominal condition, according to high load capacity operating mode,
Nominal condition and the running on the lower load water pump that type selecting obtains respectively, rated power and water-carrying capacity etc. are sequentially reduced, i.e. underload work
Condition is a kind of operating mode less than nominal condition, and high load capacity operating mode is a kind of operating mode higher than nominal condition.If by nominal condition institute
Corresponding load is referred to as shoulder load, for referring to ability corresponding under nominal condition, is calculated as 100% ability, then underload work
Load corresponding to condition is referred to as underload, and underload is less than shoulder load, for referring to the energy less than ability corresponding to shoulder load
Power, the as ability less than 100% ability；Load corresponding to high load capacity operating mode is more is referred to as high load capacity, and high load capacity is negative higher than middle
Lotus, for referring to the ability more than ability corresponding to shoulder load, the as ability more than 100% ability.It can be appreciated that water pump 1
During according to running on the lower load type selecting, water pump 1 can be selected according to water-carrying capacity during underload and lift, make the volume of water pump 1
The parameter such as constant flow and lift is adapted with running on the lower load, for example, the water pump 1 obtained according to running on the lower load type selecting, its water
Flow can be the 50%-90% of water-carrying capacity corresponding to nominal condition, wherein for example can be 50%, 60%, 70%, 80% and
90%.
In the present invention, for pumping two parallel water pumps 1 of chilled water not further according to maximum load operating mode type selecting, but
According to running on the lower load type selecting, and a preparation and a use mode is no longer used, but according to the leaving water temperature and disengaging water temperature of chilled water
Difference controls the start and stop of two water pumps 1 so that two water pumps 1 can reasonable start and stop according to the actual requirements, realize and air-conditioning system
The more consistent chilled water supply process of actually required water, due to single water pump can be avoided long-term use of, and it can prevent
There is the problem of low load with strong power, therefore, energy consumption can be reduced with effectively save cost, extend the service life of water pump 1.
Moreover, the present invention controls the start and stop of two water pumps 1 according to temperature, directly can have using air-conditioning system itself
Detection leaving water temperature and pass in and out water temperature difference device come to leaving water temperature and disengaging water temperature difference detect, without additional
Temperature-detecting device, also need to additionally set the flows such as flowmeter to examine during water pump start and stop to control accordingly, with respect to according to flow
The situation of device is surveyed, control method of the invention additionally aids the structure of simplified air-conditioning system, reduces the cost of air-conditioning system, carry
The functional reliability of high air-conditioning system.
As one embodiment of the present invention, step S2 can be according to leaving water temperature and F2Magnitude relationship and disengaging
Water temperature difference and F1And F3Magnitude relationship control the start and stop of two water pumps 1.Wherein, F1For underload when setting pass in and out water temperature
Difference, F2Setting disengaging water temperature difference when switching for shoulder load list double water pump 1, F3For high load capacity when setting pass in and out water temperature difference.In
Between load refer to corresponding load under nominal condition, it is higher than underload but is less than high load capacity.Preferably, wherein F1＜ F3.It is more excellent
Selection of land, wherein F1＜ F2＜ F3。
Due to F2Setting disengaging water temperature difference when switching for shoulder load list double water pump 1, therefore, by comparing leaving water temperature
With F2Magnitude relationship, it can be determined that the magnitude relationship of pump group supply flow and required flow；Also, due to F1For underload when
Setting disengaging water temperature difference, and F3For high load capacity when setting pass in and out water temperature difference, therefore, by comparing disengaging water temperature difference and F1With
F3Magnitude relationship, it can be determined that actual motion is any in running on the lower load, high load capacity operating mode and shoulder load operating mode
Under operating mode.So the step S2 of the embodiment passes through according to leaving water temperature and F2Magnitude relationship and disengaging water temperature difference and F1
And F3Magnitude relationship control the start and stop of two water pumps 1, output and the aspect factor of operating mode two can be considered to water pump
The influence of start and stop, it is a kind of Three dimensions control mode, it is possible to achieve more accurately start-up and shut-down control process, help further to improve
Water pump supplies the uniformity of water and the actually required water of air-conditioning system, air-conditioning system is had more excellent service behaviour.
Because air-conditioning system had generally both needed to realize refrigerating function, it is also desirable to realize that heat-production functions, namely air-conditioning system lead to
Often it is required to switch between refrigerating state and heating state, or, also there is Some Air Conditioning System to realize refrigeration
One kind in function and heat-production functions, and the requirement of refrigerating state and heating state to pump group working condition is not consistent, therefore,
The present invention has made further improvement to the step S2 in above-mentioned embodiment respectively for refrigerating state and heating state, with enabled
It is enough that more effective water pump start-up and shut-down control process is realized under refrigerating state and heating state.In order to facilitate description, below by sky
Adjusting system is in F during refrigerating state1、F2And F3It is referred to as F1l、F2lAnd F3l；Correspondingly, air-conditioning system is in heating shape
F during state1、F2And F3It is referred to as F1r、F2rAnd F3r。
Wherein, when air-conditioning system is in refrigerating state, step S2 is further arranged to also include：
As leaving water temperature≤F2lWhen, two water pumps 1 are opened；And/or
As leaving water temperature ＞ F2lWhen, according to disengaging water temperature difference and F1lAnd F3lMagnitude relationship control opening for two water pumps 1
Stop.
And when air-conditioning system is in heating state, step S2 is further arranged to also include：
As leaving water temperature≤F2rWhen, according to disengaging water temperature difference and F1rAnd F3rMagnitude relationship control opening for two water pumps 1
Stop；And/or
As leaving water temperature ＞ F2rWhen, two water pumps 1 are opened.
Above-mentioned improvement embodiment by setting different step S2, Ke Yi for refrigerating state and heating state respectively
More reasonably water pump start-up and shut-down control is realized under refrigerating state and heating state respectively, pump group supply water is more conformed to air-conditioning system
The actual demand of system, so as to more effectively cost-effective and reduction energy consumption.
Wherein, when air-conditioning system is in refrigerating state and leaving water temperature≤F2lWhen, illustrate that pump group supply water is on the low side, it is difficult to
Meet actually required water, cause the chilled water leaving water temperature after heat exchanger exchanges heat relatively low, it is necessary to increase the supply water of pump group
Amount, therefore, two water pumps 1 are now opened, the supply water of pump group can be effectively increased, raise the leaving water temperature of chilled water,
Until close to or up design temperature.And when air-conditioning system is in heating state and leaving water temperature ＞ F2rWhen, illustrate that pump group is supplied
Water is less than actually required water, causes the chilled water leaving water temperature after heat exchanger exchanges heat higher, therefore, now opens two
Water pump 1, the supply water of pump group can be effectively increased, make the leaving water temperature of chilled water reduce, until close to or up setting temperature
Degree.It can be seen that when air-conditioning system is in refrigerating state and leaving water temperature≤F2lWhen, and when air-conditioning system is in heating state and goes out
Coolant-temperature gage ＞ F2rWhen, illustrate that pump group supply water is very few, need not now take into account temperature difference of outlet water and F1And F3(specifically freeze shape
It is F during state1lAnd F3l, heat state when be F1rAnd F3r) magnitude relationship, namely without consider which kind of load be actually operate on
Under operating mode, it pump group is supplied maximum amount of water by the way that two water pumps 1 are opened, preferably meet air-conditioning system to more waters
Actual demand.
In addition wherein, when air-conditioning system is in refrigerating state and leaving water temperature ＞ F2lWhen, illustrate that pump group supply water is more than
Actually required water, cause the chilled water leaving water temperature after heat exchanger exchanges heat higher, it is desirable to reduce pump group supplies water, now
It is contemplated that wherein one or two water pumps 1 whether are closed, and in order to realize to two water pumps 1 more reasonably start-up and shut-down control, can
Further to consider the influence of load condition, according to disengaging water temperature difference and F1lAnd F3lMagnitude relationship control two water pumps 1
Start and stop, pump group is preferably met actual demand of the air-conditioning system to more waters, while can also avoid because frequently
Start and stop and the life-span for influenceing water pump 1.And when air-conditioning system is in heating state and leaving water temperature≤F2rWhen, illustrate that pump group supplies water
Amount is more than actually required water, causes the chilled water leaving water temperature after heat exchanger exchanges heat relatively low, it is desirable to reduce pump group supplies water
It amount, now may also consider whether to close wherein one or two water pumps 1, and two water pumps 1 more reasonably opened in order to realize
Stop controlling, can also further consider the influence of load condition, according to disengaging water temperature difference and F1rAnd F3rMagnitude relationship control
The start and stop of two water pumps 1, pump group is preferably met actual demand of the air-conditioning system to more waters, while also can
Avoid influenceing the life-span because of frequent start-stop.
Further, the further improvement as above-mentioned improvement embodiment, when air-conditioning system be in refrigerating state and
Leaving water temperature ＞ F2lWhen, it is foregoing according to disengaging water temperature difference and F1lAnd F3lMagnitude relationship control the start and stop of two water pumps 1 can be with
Including at least one in following three：
If pass in and out water temperature difference ＜ F1l, then control one or two water pumps 1 are closed down；
If pass in and out water temperature difference ＞ F3l, then two water pumps 1 are controlled to open；
If F1l≤ disengaging water temperature difference≤F3l, then two water pumps 1 are controlled to retain laststate.
And when air-conditioning system is in heating state and leaving water temperature≤F2rWhen, it is foregoing according to disengaging water temperature difference and F1rAnd F3r
Magnitude relationship come control the start and stop of two water pumps 1 can include following three in it is at least one：
If pass in and out water temperature difference ＜ F1r, then control one or two water pumps 1 are closed down；
If pass in and out water temperature difference ＞ F3r, then two water pumps 1 are controlled to open；
If F1r≤ disengaging water temperature difference≤F3r, then two water pumps 1 are controlled to retain laststate.
Wherein, as it was previously stated, when air-conditioning system is in refrigerating state and leaving water temperature ＞ F2lWhen, it may be considered that whether close down
Water pump 1, if now passing in and out water temperature difference ＜ F1l, then illustrate to be practically in running on the lower load, because the water pump 1 of the present invention is according to low
The water pump that load condition type selecting determines, therefore, water pump 1 can meet demand, it is therefore possible to control a water pump 1 is closed down,
Certainly, if close down a water pump 1 still differs more with actual demand, two water pumps 1 can also be closed down, carries out shutdown behaviour
Make；If pass in and out water temperature difference ＞ F3l, then illustrate to be practically in high load capacity operating mode, because the water pump 1 of the present invention is according to underload work
The water pump that condition type selecting determines, therefore, now water pump 1 can not meet demand, it is therefore possible to control two water pumps 1 are opened,
Certainly, if two water pumps 1 have been in running status, without any action；And if F1l≤ disengaging water temperature difference≤F3l,
Then explanation is practically in shoulder load operating mode, can now in order to avoid life-span and functional reliability that frequent start-stop influences pump group
Without any action, to control two water pumps 1 to retain laststate.
In addition, as it was previously stated, when air-conditioning system is in heating state and leaving water temperature≤F2rWhen, it may be considered that whether close down
Water pump 1, if now passing in and out water temperature difference ＜ F1r, then illustrate to be practically in running on the lower load, because the water pump 1 of the present invention is according to low
The water pump that load condition type selecting determines, therefore, water pump 1 can meet demand, it is therefore possible to control a water pump 1 is closed down,
Certainly, if close down a water pump 1 still differs more with actual demand, two water pumps 1 can also be closed down, carries out shutdown behaviour
Make；If pass in and out water temperature difference ＞ F3r, then illustrate to be practically in high load capacity operating mode, because the water pump 1 of the present invention is according to underload work
The water pump that condition type selecting determines, therefore, now water pump 1 can not meet demand, it is therefore possible to control two water pumps 1 are opened,
Certainly, if two water pumps 1 have been in running status, without any action；And if F1r≤ disengaging water temperature difference≤F3r,
Then explanation is practically in shoulder load operating mode, can now in order to avoid life-span and functional reliability that frequent start-stop influences pump group
Without any action, to control two water pumps 1 to retain laststate.
It can be seen that pass through the leaving water temperature ＞ F under refrigerating state respectively2lWhen and heating state under leaving water temperature≤F2rWhen,
Take into account temperature difference of outlet water and F1And F3(it is F during specific refrigerating state1lAnd F3l, heat state when be F1rAnd F3r) magnitude relationship,
And further directed to " disengaging water temperature difference ＜ F1”、“F1≤ disengaging water temperature difference≤F3" and " disengaging water temperature difference ＞ F3" three kinds of situations
Implement different start-up and shut-down control strategies, the output and actual demand that can make pump group more conform to, so as to more effectively reduce
Cost, energy consumption is saved, extend the service life of pump group, improve the functional reliability of air-conditioning system.
In one particular embodiment of the present invention, can be connected in parallel to each other and according to low using following policy control two
The start and stop for the water pump 1 that load condition type selecting determines：
(1) air-conditioning system is in refrigerating state
As disengaging water temperature difference ＜ F1lAnd leaving water temperature ＞ F2lWhen, a water pump 1 is closed immediately；
As disengaging water temperature difference ＜ F1lAnd leaving water temperature≤F2lWhen, two water pumps 1 of control are opened；
Work as F1l≤ disengaging water temperature difference≤F3lAnd leaving water temperature≤F2lWhen, two water pumps 1 of control are opened；
Work as F1l≤ disengaging water temperature difference≤F3lAnd leaving water temperature ＞ F2lWhen, two water pumps 1 retain laststate；
As disengaging water temperature difference ＞ F3lWhen, controlling two water pumps 1 to open, (water pump 1 of closing is opened, if two water pumps 1 are equal
In opening, then without any action).
(2) air-conditioning system is in heating state
As disengaging water temperature difference ＜ F1rAnd leaving water temperature ＞ F2rWhen, two water pumps 1 of control are opened；
As disengaging water temperature difference ＜ F1rAnd leaving water temperature≤F2rWhen, a water pump 1 is closed immediately；
Work as F1r≤ disengaging water temperature difference≤F3rAnd leaving water temperature≤F2rWhen, two water pumps 1 retain laststate；
Work as F1r≤ disengaging water temperature difference≤F3rAnd leaving water temperature ＞ F2rWhen, two water pumps 1 of control are opened；
As disengaging water temperature difference ＞ F3rWhen, controlling two water pumps 1 to open, (water pump 1 of closing is opened, if two water pumps 1 are equal
In opening, then without any action).
Above-described embodiment carries out parallel connection, and the water pump 1 according to temperature to two ting models from the water pump 1 of two ting models
Start-up and shut-down control is carried out, leaving water temperature is considered and passes in and out the influence of the aspect factor of water temperature difference two, using three-dimensional start-up and shut-down control plan
Slightly, the automatic control function of each water pump start and stop is realized, preferably meets the refrigeration requirement of user, wherein, when air-conditioning system is high negative
When lotus runs, automatically control and open two water pumps 1, the water of pump group supply can be increased, make leaving water temperature closer to setting temperature
Degree, effectively avoids frequently closing down machine or unloading, improves functional reliability, improves Consumer's Experience；And when air-conditioning system underload is transported
During row, a wherein water pump 1 is automatically turned on, low load with strong power can be avoided the occurrence of on the basis of actual amount of water demand is met
Phenomenon occur, save the energy, reduce cost.It can be seen that the control method of the embodiment, simple and reliable, cost is cheap, safety section
Energy.
Another aspect of the present invention additionally provides a kind of air-conditioning system, and it includes heat exchanger 2 and for pumping chilled water to changing
The pump group to be exchanged heat at hot device 2, pump group include two water pumps 1 being connected in parallel to each other, and water pump 1 is true according to running on the lower load type selecting
It is fixed.
Wherein, two water pumps 1 are further according to high load capacity operating mode type selecting, but according to running on the lower load type selecting, it is convenient to carry out
The foregoing control method of the present invention.Also, due to compared to the water pump selected according to high load capacity operating mode or nominal load operating mode, according to
The water pump water-carrying capacity selected according to running on the lower load is smaller, and rotating speed is relatively low, therefore, vibration and also smaller, the required input work of noise
Rate is relatively low, and therefore, the present invention determines water pump 1 according to running on the lower load type selecting, additionally it is possible to reduces the vibration of air-conditioning system and makes an uproar
Sound, lift user's usage comfort.
And realize for convenience and the automatic start-stop of two water pumps 1 is controlled, air-conditioning system of the invention can also be further
Including control device, and control device is configured to control two water pumps according to the leaving water temperature and disengaging water temperature difference of chilled water
1 start and stop.The air-conditioning system is so based on, the aforementioned control method of the present invention can be realized automatically, further facilitating user makes
With improvement user experience.
The exemplary embodiment of the present invention is the foregoing is only, is not intended to limit the invention, all spirit in the present invention
Within principle, any modification, equivalent substitution and improvements made etc., it should be included in the scope of the protection.
Claims (10)
1. a kind of water pump start-up and shut-down control method of air-conditioning system, it is characterised in that including：
Step S1, there is provided the pump group to be exchanged heat including heat exchanger (2) and for pumping chilled water to the heat exchanger (2) place
Air-conditioning system, the pump group include two water pumps (1) being connected in parallel to each other, and the water pump (1) determines according to running on the lower load type selecting；
Step S2, the start and stop of two water pumps (1) are controlled according to the leaving water temperature of chilled water and disengaging water temperature difference.
2. according to the method for claim 1, it is characterised in that in the step S2, according to leaving water temperature and F2Size
Relation and disengaging water temperature difference and F1And F3Magnitude relationship control the start and stop of two water pumps (1)；
Wherein, F1For underload when setting pass in and out water temperature difference, F2Setting disengaging when switching for shoulder load list double water pump (1)
Water temperature difference, F3For high load capacity when setting pass in and out water temperature difference.
3. according to the method for claim 2, it is characterised in that F1＜ F3。
4. according to the method for claim 3, it is characterised in that F1＜ F2＜ F3。
5. according to any described methods of claim 2-4, it is characterised in that when the air-conditioning system is in refrigerating state,
The step S2 also includes：
As leaving water temperature≤F2lWhen, described two water pumps (1) are opened；And/or
As leaving water temperature ＞ F2lWhen, according to disengaging water temperature difference and F1lAnd F3lMagnitude relationship control two water pumps (1)
Start and stop；
Wherein, F1lF during refrigerating state is in for air-conditioning system1, F2lF during refrigerating state is in for air-conditioning system2, F3lFor sky
Adjusting system is in F during refrigerating state3。
6. according to the method for claim 5, it is characterised in that when the air-conditioning system is in refrigerating state and leaving water temperature
＞ F2lWhen, the step S2 also includes at least one in following three：
If pass in and out water temperature difference ＜ F1l, then control one or two water pumps (1) are closed down；
If pass in and out water temperature difference ＞ F3l, then two water pumps (1) are controlled to open；
If F1l≤ disengaging water temperature difference≤F3l, then two water pumps (1) are controlled to retain laststate.
7. according to any described methods of claim 2-4, it is characterised in that when the air-conditioning system is in heating state,
The step S2 also includes：
As leaving water temperature≤F2rWhen, according to disengaging water temperature difference and F1rAnd F3rMagnitude relationship control two water pumps (1)
Start and stop；And/or
As leaving water temperature ＞ F2rWhen, described two water pumps (1) are opened；
Wherein, F1rF during heating state is in for air-conditioning system1, F2rF during heating state is in for air-conditioning system2, F3rFor sky
Adjusting system is in F during heating state3。
8. according to the method for claim 7, it is characterised in that when the air-conditioning system is in heating state and leaving water temperature
≤F2rWhen, the step S2 also includes at least one in following three：
If pass in and out water temperature difference ＜ F1r, then control one or two water pumps (1) are closed down；
If pass in and out water temperature difference ＞ F3r, then two water pumps (1) are controlled to open；
If F1r≤ disengaging water temperature difference≤F3r, then two water pumps (1) are controlled to retain laststate.
9. a kind of air-conditioning system, it is characterised in that including heat exchanger (2) and for pumping chilled water to the heat exchanger (2) place
The pump group to be exchanged heat, the pump group include two water pumps (1) being connected in parallel to each other, and the water pump (1) is selected according to running on the lower load
Type determines.
10. air-conditioning system according to claim 9, it is characterised in that the air-conditioning system also includes control device, described
Control device can control the start and stop of two water pumps (1) according to the leaving water temperature and disengaging water temperature difference of chilled water.
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| CN113739391A (en) * | 2021-08-23 | 2021-12-03 | 珠海格力电器股份有限公司 | Water pump operation control method and system, air-conditioning water pump and air-conditioning unit |
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Application publication date: 20171226 |