CN111536575A - Water pump frequency conversion control method with tail end regulation and control function for heat pump heating system - Google Patents
Water pump frequency conversion control method with tail end regulation and control function for heat pump heating system Download PDFInfo
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 16
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- 230000002123 temporal effect Effects 0.000 claims 1
- 239000003245 coal Substances 0.000 description 2
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- 239000002689 soil Substances 0.000 description 2
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- 230000009471 action Effects 0.000 description 1
- 239000003570 air Substances 0.000 description 1
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- 238000011084 recovery Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/18—Hot-water central heating systems using heat pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1012—Arrangement or mounting of control or safety devices for water heating systems for central heating by regulating the speed of a pump
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1039—Arrangement or mounting of control or safety devices for water heating systems for central heating the system uses a heat pump
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/02—Hot-water central heating systems with forced circulation, e.g. by pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
- F24D3/1058—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system disposition of pipes and pipe connections
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
A water pump frequency conversion control method with tail end regulation and control for a heat pump heating system relates to a water pump frequency conversion control method. The temperature controller transmits a command to open or close the electric two-way valve; the lowest frequency n2 of the water pump motor and the frequency change interval dn are used for dividing the frequency from the lowest frequency n2 to the power frequency n1 into a plurality of gears, and meanwhile, the running time delta t after gear switching is set; the frequency converter controls the water pump to operate in a variable speed mode, the initial working frequency of a water pump motor is power frequency N1, and the actual working frequency is N; when the frequency N is the lowest frequency N2 of the water pump motor, the electromagnetic valve is opened, otherwise, the electromagnetic valve is closed; the pressure difference bypass valve is preset with a pressure difference set value, the actual pressure difference value is larger than the pressure difference set value, the pressure difference bypass valve is opened, the actual pressure difference value is smaller than the pressure difference set value, and the pressure difference bypass valve is closed. The heat is supplied as required through the matching of the temperature controller and the electric two-way valve, and the water pump operates in a frequency conversion mode according to the change of the heat demand of a user, so that the environment is protected, and the energy is saved.
Description
Technical Field
The invention relates to a water pump frequency conversion control method, in particular to a water pump frequency conversion control method with tail end regulation and control for a heat pump heating system, and belongs to the field of building heating.
Background
At present, a mode of using coal-fired carbon as a heat source during heating in winter is one of main reasons for aggravating haze problems of cold areas and severe cold areas in the north of China, most of provinces and governments issue a policy of changing coal into clean energy, great support is given to related reconstruction or new projects, and a heat pump heating system using renewable energy sources such as air, soil, surface water and the like as heat sources becomes one of important measures for pushing the heating of changing coal into clean energy sources in various places. In addition, excessive heating is also one of the problems in the central heating mode in China, and the haze problem is also aggravated. At present, the heat loss in the central heating system in China reaches 15% -30%, wherein one important reason is that most areas charge according to the building area or the heating area, and if the indoor temperature is too high, a heat user is more inclined to open a window to dissipate heat instead of purchasing a temperature control device.
If the heating system using the heat pump unit as the heat source replaces the original central heating form, the method becomes the main mode of collecting heat fee to the heat consumer by counting the electric energy consumption, which is different from the original charging according to the building area. In this case, in order to reduce power consumption, it is preferable to control heat supply by using a temperature control device or the like, thereby obtaining energy saving benefits.
However, a temperature control device, such as a temperature control valve, is installed at the end of the heat pump heating system, and when the system is in operation, the room temperature of each room reaches a set value, the corresponding temperature control valve is closed, and the flow rate of the system is reduced. The too low system flow can lead to the rapid reduction of water pump work efficiency, also can reduce heat pump set's efficiency to a certain extent. Therefore, in order to ensure the heating effect of the tail end and adapt to the change of the heat load, realize heat supply according to needs, reduce unnecessary power consumption of a water pump and a unit, the heat pump heating system needs a corresponding flow control method urgently.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a variable frequency control method of a water pump with tail end regulation and control for a heat pump heating system, which meets the temperature requirement of a heat user side through the matching between a temperature controller and an electric two-way valve, realizes heat supply as required, and in addition, the water pump can also be operated in a variable frequency mode according to the change of the heat requirement of the user, so that the performance of the heat pump unit is not influenced by the increase of equipment, and the method is environment-friendly and energy-saving.
In order to achieve the purpose, the invention adopts the following technical scheme: a heat pump heating system has a tail end control water pump frequency conversion control method, a heat pump set of the heat pump heating system is connected with a water supply main pipeline and a water return main pipeline, at least one heating branch pipeline is connected between the water supply main pipeline and the water return main pipeline, a heating tail end and an electric two-way valve are connected on the heating branch pipeline, the electric two-way valve is connected with a temperature controller, a bypass branch pipeline is also connected between the water supply main pipeline and the water return main pipeline, the bypass branch pipeline is positioned between the heating branch pipeline and the heat pump set, an electromagnetic valve and a differential pressure bypass valve are connected on the bypass branch pipeline, a first temperature sensor is installed on the water supply main pipeline between the bypass branch pipeline and the heat pump set, a second temperature sensor is installed on the water return main pipeline between the bypass branch pipeline and the heat pump set, and a water pump is installed on the water return main pipeline between the, the water pump is connected with a frequency converter, wherein,
the temperature controller transmits instructions to the electric two-way valve so as to open or close the electric two-way valve;
the lowest frequency n2 of the water pump motor and the frequency change interval dn are used for dividing the frequency from the lowest frequency n2 to the power frequency n1 into a plurality of gears, and meanwhile, the running time delta t after gear switching is set;
the converter receives water supply temperature t1 that first temperature sensor measured and return water temperature t2 that second temperature sensor measured, and the operation of control water pump variable speed, the initial operating frequency of water pump motor are power frequency N1, and the actual operating frequency of water pump motor is N, and the frequency conversion logic is: if the water supply and return temperature difference t1-t2 is less than 4.5 ℃, the working frequency of the water pump motor is reduced to N-dn in first-gear operation and is reduced to the lowest frequency N2 at most, then the frequency is kept for the time length of delta t, the judgment of the water supply and return temperature difference t1-t2 is returned, if the water supply and return temperature difference t1-t2 is not less than 4.5 ℃, the judgment of whether the water supply and return temperature difference t1-t2 is more than 5.5 ℃ is continued, if yes, the working frequency of the water pump motor is increased to N + dn in first-gear operation and is increased to the power frequency N1 at most, then the frequency is kept for the time length of delta t, the judgment of the water supply and return temperature difference t1-t2 is returned, otherwise, the working frequency of the water pump motor is not changed, and the judgment;
the electromagnetic valve controls a switch by receiving a frequency N signal of the frequency converter, and when the frequency N is the lowest frequency N2 of the water pump motor, the electromagnetic valve is electrified to be opened, otherwise, the electromagnetic valve is closed;
the pressure difference bypass valve is preset with a pressure difference set value, the actual pressure difference value of the hot user side is compared with the pressure difference set value, if the actual pressure difference value is larger than the pressure difference set value, the pressure difference bypass valve is opened, and if the actual pressure difference value is smaller than the pressure difference set value, the pressure difference bypass valve is closed.
Compared with the prior art, the invention has the beneficial effects that: the invention can meet the temperature requirement of a heat user side through the matching between the temperature controller and the electric two-way valve, realizes heat supply as required, and the water pump can operate in a variable frequency mode according to the change of the heat requirement of the user; the water pump adopts temperature difference control, has reduced the cost of sensor on the one hand, and on the other hand can be attached temperature sensor at the pipeline outer wall to the energy-conserving transformation of current project, has avoided the trouble of destroying the pipeline, and environmental protection and energy saving have good economic benefits.
Drawings
Fig. 1 is a schematic view of the heat pump heating system of the present invention;
FIG. 2 is a frequency conversion logic block diagram of the frequency converter of the present invention;
FIG. 3 is a schematic of the differential pressure set point calculation for the differential pressure bypass valve of the present invention.
Detailed Description
The technical solutions in the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art without any creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
Referring to fig. 1, the invention discloses a water pump frequency conversion control method with end regulation and control for a heat pump heating system, a heat pump unit 1 of the heat pump heating system is connected with a main water supply pipeline and a main water return pipeline, at least one heating branch pipeline is connected between the main water supply pipeline and the main water return pipeline, a heating end 4 and an electric two-way valve 3a are connected on the heating branch pipeline, a temperature controller 3b is connected on the electric two-way valve 3a, a bypass branch pipeline is also connected between the main water supply pipeline and the main water return pipeline, the bypass branch pipeline is positioned between the heating branch pipeline and the heat pump unit 1, an electromagnetic valve 2a and a differential pressure bypass valve 2b are connected on the bypass branch pipeline, a first temperature sensor 5a is installed on the main water supply pipeline between the bypass branch pipeline and the heat pump unit 1, a second temperature sensor 5b is installed on the main water return pipeline between the bypass, a water pump 7 is arranged on a backwater main pipeline between the second temperature sensor 5b and the heat pump unit 1, the water pump 7 is connected with a frequency converter 6, wherein,
the heat pump unit 1 can be a single heat pump or can be an integration of a plurality of heat pump units, the heat pump is not limited to a specific renewable energy heat pump, and can be an air source heat pump, a soil source heat pump or a compound heat pump of a plurality of energy sources;
the electromagnetic valve 2a controls the switch by receiving a frequency N signal of the frequency converter 6, when the frequency N is the lowest frequency N2 of the motor of the water pump 7, the electromagnetic valve 2a is electrified to be opened, otherwise, the electromagnetic valve is closed;
a pressure difference set value is preset in the pressure difference bypass valve 2b, two built-in pressure interfaces are respectively connected to a water supply main pipeline and a water return main pipeline, wherein a connection point of the pressure difference bypass valve 2b and the water return main pipeline is arranged at the upstream of the water pump 7, so that the actual pressure difference value and the pressure difference set value on the hot user side are compared, if the actual pressure difference value is larger than the pressure difference set value, the pressure difference bypass valve 2b is opened, and if the actual pressure difference value is smaller than the pressure difference set value, the;
the electric two-way valve 3a can be any electric two-way valve with on-off function, and can adopt an electromagnetic valve, an electric regulating valve, a dynamic differential pressure balance type electric regulating valve and the like;
the temperature controller 3b measures the indoor temperature and provides a target temperature value set by a user, when the indoor temperature is equal to or higher than the target temperature value, the temperature controller 3b transmits a closing instruction to the electric two-way valve 3a to close the electric two-way valve 3a, and when the indoor temperature is lower than the target temperature value, the temperature controller 3b transmits an opening instruction to the electric two-way valve 3a to open the electric two-way valve 3 a;
the heating terminal 4 can be a fan coil, a floor heating coil or a radiator and other heating equipment;
the first temperature sensor 5a and the second temperature sensor 5b can be thermal resistors or thermocouples, the first temperature sensor 5a measures the water supply temperature t1, the second temperature sensor 5b measures the water return temperature t2, the installation mode can be direct insertion type contact with water, and if the pipeline is a metal pipeline, the pipeline can be attached to the outer wall of the pipeline for wall attachment measurement;
the frequency converter 6 carries out programmable operation according to the input of the temperature, outputs the working frequency of the motor of the water pump 7, further controls the water pump 7 to run in a variable speed mode, determines the working frequency of the motor of the water pump 7 by receiving the water supply temperature t1 measured by the first temperature sensor 5a and the water return temperature t2 measured by the second temperature sensor 5b, and the variable frequency logic is shown in figure 2;
before the heat pump heating system is operated, a user presets a target temperature value of the temperature controller 3b according to requirements, in order to ensure safe operation of the water pump 7 and the heat pump unit 1, the lowest frequency n2 (such as 35Hz) and the frequency change interval dn (such as 5Hz) of the motor of the water pump 7 are determined, so that the frequency is divided into a plurality of gears (such as 35Hz,40Hz,45Hz and 50Hz) from the lowest frequency n2 to the power frequency n1 (such as 50Hz), the operation time length △ t (such as 0.5 hour) after gear switching is set, as shown in figure 3, the pressure difference set value of the pressure difference bypass valve 2b is operated according to the lowest frequency n2 of the motor of the water pump 7, and when the flow of the water pump 7 is the minimum flow QminDetermination of the actual pressure difference value on the time-thermal user side, Qmin30% -40% of rated flow of heat pump unit 1, Q in figure 3 is water pump flow, H is water pump lift, and water pump performance curve L1For power frequency n1 operation, the flow rate of water pump is increasedRelation curve of lift, water pump performance curve L2Is a relation curve of water pump flow and lift when the lowest frequency n2 runs, S1S and S2For the pipe network characteristic curve of the heat pump heating system, wherein S1For the heat pump unit 1 at the design flow Q1The heat pump heating system pipe network characteristic curve of the time, the water pump 7 motor runs with power frequency n1 at this moment, S is the heat pump heating system pipe network characteristic curve of the heat pump set 1 when the partial flow, the water pump 7 motor runs with lowest frequency n2 at this moment, S2For the heat pump unit 1 at the minimum flow QminAccording to the characteristic curve of the heat pump heating system pipe network, the water pump 7 motor runs at the lowest frequency n2, H1The motor of the water pump 7 runs at the power frequency n1 and the flow rate is Q1Pump lift of time H2For the water pump 7 motor to operate at the lowest frequency n2 and with a flow rate QminThe set value of the pressure difference bypass valve 2b is determined by the pump lift H2Minimum flow Q of heat pump unit 1minCorresponding pressure drop △ H difference estimate, which estimates the pressure drop setpoint and QminCan be used as the design and model selection basis of the differential pressure bypass valve 2 b;
when the working frequency of the motor of the water pump 7 is reduced to the lowest frequency n2, the electromagnetic valve 2a is electrified and opened, because the actual differential pressure value at the hot user side is smaller than the set differential pressure value, the differential pressure bypass valve 2b is in a closed state at the moment, and the water pump 7 continues to reduce along with the flow Q at the hot user side, and the performance curve L of the water pump 7 is formed2Throttling regulation, when the flow Q of the heat user side is reduced to the minimum flow Q of the heat pump unit 1minWhen the actual differential pressure value of the heat user side is equal to the differential pressure set value, the differential pressure bypass valve 2b starts to be opened at the moment, and when the flow Q of the heat user side is lower than the minimum flow Q of the heat pump unit 1minAt this time, since the actual differential pressure value on the hot user side is larger than the differential pressure set value, the differential pressure bypass valve 2b bypasses a part of the flow rate QminQ, ensuring the minimum flow Q of the working flow of the heat pump unit 1min；
After the heat pump heating system is operated, the initial working frequency of a motor of the water pump 7 is power frequency n1(50Hz), at the moment, the differential pressure bypass valve 2b is in a closed state, the heat pump unit 1 works, the heating tail end 4 starts to supply heat, the indoor temperature gradually rises, when the indoor temperature reaches a target temperature value of the temperature controller 3b set by a user, the electric two-way valve 3a is closed, so that the heat supply of the heating tail end 4 is stopped, and on the contrary, when the indoor temperature is lower than the target temperature value of the temperature controller 3b, the electric two-way valve 3 a;
with the action of the electric two-way valve 3a, which means the fluctuation of heat consumption of a heat user side, the frequency converter 6 determines the working frequency of the motor of the water pump 7 by receiving the water supply temperature t1 measured by the first temperature sensor 5a and the water return temperature t2 measured by the second temperature sensor 5b, the actual working frequency of the motor of the water pump 7 is N, if the water supply and return temperature difference t1-t2 is less than 4.5 ℃, the working frequency of the motor of the water pump 7 is reduced to one gear (namely, the frequency is changed to N-dn) and is reduced to the lowest frequency N2 at most, then the frequency is kept for the time length of delta t (0.5 hour), and finally the judgment of the water supply and return temperature difference t1-t2 is returned again;
if the temperature difference t1-t2 between the water supply and the water return is not less than 4.5 ℃, continuously judging whether the temperature difference t1-t2 between the water supply and the water return is greater than 5.5 ℃, if so, increasing the working frequency of the motor of the water pump 7 to the first gear (namely, the frequency is changed into N + dn) and at most to the power frequency N1, then keeping the frequency for the time length of delta t (0.5 hour) of operation, and finally returning to the judgment of the temperature difference t1-t2 between the water supply and the water return;
if the temperature difference t1-t2 between the water supply and the water return is not less than 4.5 ℃ and not more than 5.5 ℃, the working frequency of the motor of the water pump 7 is unchanged, and the judgment of the temperature difference t1-t2 between the water supply and the water return is continuously returned;
when the working frequency of the motor of the water pump 7 is reduced to the lowest frequency n2, the electromagnetic valve 2a is opened, then when the heat demand of a user is reduced, the electric two-way valve 3a is closed, the pressure difference between two sides of the bypass branch pipeline where the pressure difference bypass valve 2b is located is increased and is greater than a pressure difference set value, the pressure difference bypass valve 2b is opened, one part of the water supplied by the heat pump unit 1 enters the heat user side, and the other part of the water supplied by the heat pump unit 1 passes through the pressure difference bypass valve 2b, otherwise, when the heat demand of the user is increased, the electric two-way valve 3a is opened, the pressure difference between two sides of the bypass branch pipeline where the pressure difference bypass valve 2b is located is reduced and is smaller than the pressure difference set value, the pressure difference bypass valve 2b is closed, if the heat demand of the user.
The heat pump heating system adopts the method to heat, the water pump 7 can save more than 20% of electric energy in the whole heating season, the heat pump unit 1 can save more than 40% of electric energy, the heat consumption is reduced by more than 45%, and compared with the traditional heat pump heating system, the heat pump heating system adopting the method has the investment recovery period of about 2 years.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (4)
1. A water pump frequency conversion control method with tail end regulation and control for a heat pump heating system is characterized in that: a heat pump unit (1) of a heat pump heating system is connected with a water supply main pipeline and a water return main pipeline, at least one heating branch pipeline is connected between the water supply main pipeline and the water return main pipeline, a heating terminal (4) and an electric two-way valve (3a) are connected onto the heating branch pipeline, the electric two-way valve (3a) is connected with a temperature controller (3b), a bypass branch pipeline is further connected between the water supply main pipeline and the water return main pipeline, the bypass branch pipeline is positioned between the heating branch pipeline and the heat pump unit (1), an electromagnetic valve (2a) and a differential pressure bypass valve (2b) are connected onto the bypass branch pipeline, a first temperature sensor (5a) is installed on the water supply line between the bypass branch pipeline and the heat pump unit (1), and a second temperature sensor (5b) is installed on the water return main pipeline between the bypass branch pipeline and the heat pump unit (1), a water pump (7) is arranged on a backwater main pipeline between the second temperature sensor (5b) and the heat pump unit (1), the water pump (7) is connected with a frequency converter (6), wherein,
the temperature controller (3b) transmits an instruction to the electric two-way valve (3a) to open or close the electric two-way valve (3 a);
the lowest frequency n2 of the motor of the water pump (7) and the frequency change interval dn are used for dividing the frequency from the lowest frequency n2 to the power frequency n1 into a plurality of gears, and meanwhile, the running time delta t after gear switching is set;
the frequency converter (6) receives the water supply temperature t1 measured by the first temperature sensor (5a) and the return water temperature t2 measured by the second temperature sensor (5b), the water pump (7) is controlled to operate at variable speed, the initial working frequency of the motor of the water pump (7) is power frequency N1, the actual working frequency of the motor of the water pump (7) is N, and the frequency conversion logic is as follows: if the water supply and return temperature difference t1-t2 is less than 4.5 ℃, the working frequency of the motor of the water pump (7) is reduced to N-dn in first-gear operation and is reduced to the lowest frequency N2 at most, then the frequency is kept for the time length of delta t, the judgment of the water supply and return temperature difference t1-t2 is returned, if the water supply and return temperature difference t1-t2 is not less than 4.5 ℃, whether the water supply and return temperature difference t1-t2 is greater than 5.5 ℃ is continuously judged, if yes, the working frequency of the motor of the water pump (7) is increased to N + dn in first-gear operation and is increased to the power frequency N1 at most, then the time length of delta t is kept, the judgment of the water supply and return temperature difference t1-t2 is returned, otherwise, the judgment of the water supply and return temperature difference t1-t2 is returned;
the electromagnetic valve (2a) controls a switch by receiving a frequency N signal of the frequency converter (6), when the frequency N is the lowest frequency N2 of the motor of the water pump (7), the electromagnetic valve (2a) is electrified to be opened, otherwise, the electromagnetic valve is closed;
the pressure difference bypass valve (2b) is preset with a pressure difference set value, the actual pressure difference value of the hot user side is compared with the pressure difference set value, if the actual pressure difference value is larger than the pressure difference set value, the pressure difference bypass valve (2b) is opened, and if the actual pressure difference value is smaller than the pressure difference set value, the pressure difference bypass valve (2b) is closed.
2. The method for controlling the frequency conversion of the water pump with the tail end regulation of the heat pump heating system according to the claim 1 is characterized in that: the temperature controller (3b) measures the indoor temperature and provides a target temperature value set by a user, when the indoor temperature is equal to or higher than the target temperature value, the temperature controller (3b) transmits a closing instruction to the electric two-way valve (3a) to close the electric two-way valve (3a), and when the indoor temperature is lower than the target temperature value, the temperature controller (3b) transmits an opening instruction to the electric two-way valve (3a) to open the electric two-way valve (3 a).
3. The method for controlling the frequency conversion of the water pump with the tail end regulation of the heat pump heating system according to the claim 1 is characterized in that: the pressure difference set value of the pressure difference bypass valve (2b) runs at the lowest frequency n2 according to the operation of a motor of the water pump (7), and when the flow of the water pump (7) is the minimum flow Q of the heat pump unit (1)minThe actual differential pressure value of the temporal user side is determined.
4. The method for controlling the frequency conversion of the water pump with the tail end regulation of the heat pump heating system according to the claim 3 is characterized in that: the heat pump unit (1) has the minimum flow Qmin30-40% of the rated flow of the heat pump unit (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010306880.0A CN111536575A (en) | 2020-04-17 | 2020-04-17 | Water pump frequency conversion control method with tail end regulation and control function for heat pump heating system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010306880.0A CN111536575A (en) | 2020-04-17 | 2020-04-17 | Water pump frequency conversion control method with tail end regulation and control function for heat pump heating system |
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| CN111536575A true CN111536575A (en) | 2020-08-14 |
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| CN202010306880.0A Pending CN111536575A (en) | 2020-04-17 | 2020-04-17 | Water pump frequency conversion control method with tail end regulation and control function for heat pump heating system |
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