CN113606782A - Variable frequency control method and device of heat pump unit, storage medium and heat pump unit - Google Patents
Variable frequency control method and device of heat pump unit, storage medium and heat pump unit Download PDFInfo
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- CN113606782A CN113606782A CN202110869798.3A CN202110869798A CN113606782A CN 113606782 A CN113606782 A CN 113606782A CN 202110869798 A CN202110869798 A CN 202110869798A CN 113606782 A CN113606782 A CN 113606782A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H4/00—Fluid heaters characterised by the use of heat pumps
- F24H4/02—Water heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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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
The invention provides a frequency conversion control method and device of a heat pump unit, a storage medium and the heat pump unit, wherein the frequency conversion control method of the heat pump unit comprises the following steps: s1, controlling the water pump to operate for a first preset time t according to preset parameters1Measuring and calculating the temperature difference delta T of inlet and outlet water1(ii) a S2, when T is satisfied1＜|△T1‑TTarget|＜T2And controlling the water pump to operate for a second preset time t2Measuring and calculating the temperature difference delta T of inlet and outlet water2Wherein T isTargetThe target temperature difference of water inlet and outlet is obtained; s3, judging whether | delta T is satisfied1‑△T2|＞T0If so, adjusting the duty ratio of the water pump according to a first preset parameter; if not, the duty ratio of the water pump is maintained to operate. Hair brushThe variable frequency control method of the heat pump unit is carried out at the temperature difference T from the targetTargetWhen the heat pump unit is close to the heat pump unit, the duty ratio of the water pump is adjusted according to the temperature difference change trend by comparing the temperature difference change in adjacent periods so as to accurately regulate and control and avoid frequent fluctuation of the heat pump unit, and the performance and the operation reliability of the heat pump unit are ensured.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a frequency conversion control method and device of a heat pump unit, a storage medium and the heat pump unit.
Background
The air source heat pump unit uses air as a heat source, and drives a compressor to run by electric energy so as to convert low-grade energy into high-grade energy to provide cold water or hot water required by a user.
The water pump is one of the core components of the air source heat pump, and the control technology greatly influences the user experience and the energy-saving performance of the product; the existing water pumps on the market have two types of fixed frequency and variable frequency, wherein the fixed frequency water pump cannot adjust the rotating speed according to actual requirements, the energy-saving effect is poor, and faults are easy to occur; the variable frequency water pump can be flexibly adjusted according to the operation requirement of the unit, and is increasingly applied to the air source heat pump system.
In the prior art, a compressor or a water pump of a heat pump unit is generally controlled to operate according to the temperature difference of inlet and outlet water; for example, chinese patent application No. 201410676790.5 discloses a variable frequency control method, which includes calculating a load value according to a water inlet temperature of a water pump; if the load value is increased, correspondingly increasing the frequency of the heat pump compressor according to the current inlet water temperature, and then increasing the frequency of the water pump; if the load value is reduced, the frequency of the heat pump compressor is reduced correspondingly according to the water inlet temperature, and then the frequency of the water pump is reduced; but the method has the defects of inaccuracy in control method, large influence of fluctuation, repeated loading and unloading of the compressor, frequent change, long control period and the like.
Therefore, the control of the variable-frequency water pump is accurately realized, and the best performance and the operation reliability of the heat pump unit are favorably exerted.
Disclosure of Invention
The invention solves the problems that the existing variable-frequency water pump has the defects of inaccurate control, frequent change, long adjustment period and the like.
To solveThe invention provides a frequency conversion control method of a heat pump unit, which comprises the following steps: s1, controlling the water pump to operate for a first preset time t according to preset parameters1Measuring and calculating the temperature difference delta T of inlet and outlet water1(ii) a S2, when T is satisfied1＜|△T1-TTarget|＜T2And controlling the water pump to operate for a second preset time t2Measuring and calculating the temperature difference delta T of inlet and outlet water2Wherein T isTargetThe target temperature difference of water inlet and outlet is obtained; s3, judging whether | delta T is satisfied1-△T2|＞T0If so, adjusting the duty ratio of the water pump according to a first preset parameter; if not, the duty ratio of the water pump is maintained to operate.
By TTargetThe temperature difference between inlet water and outlet water of the heat pump unit is controlled as a reference, so that the temperature difference is allowed to fluctuate within a certain range, and the water pump is prevented from being frequently adjusted; if the temperature difference change of the inlet water and the outlet water is large, the heating capacity of the heat pump unit is large at the moment, the rotating speed of the water pump is not matched with the capacity of the heat pump unit, and the rotating speed of the water pump needs to be adjusted; the duty ratio is a special term for control, the electric control structure issues a control instruction of the motor through the duty ratio, and the duty ratio can be understood as a periodic power supply proportion and is not described herein; when the duty ratio is large, the power supply proportion is small, and the rotating speed of the motor is reduced; when the duty ratio is small, the power supply proportion is large, and the rotating speed of the motor is increased.
Preferably, the first preset parameter is: when Δ T1-△T2＞T0If so, the duty ratio A of the water pump is A (1+ a%); when Δ T1-△T2＜-T0And if so, the duty ratio A of the water pump is equal to A (1-a%).
When the unit is at the temperature difference T from the targetTargetComparing the temperature difference changes of adjacent periods when the temperature difference changes are closer; if the detected temperature difference is still rising, which indicates that the capacity of the unit is larger, the duty ratio of the water pump is reduced to improve the rotating speed; when the detected temperature difference is continuously reduced, the duty ratio of the water pump is increased to reduce the rotating speed of the water pump; and if the temperature difference in the two periods is not changed greatly, maintaining the current duty ratio to operate so as to prevent the frequent fluctuation of the water pump.
Preferably, the step S2 includes: s21, judging whether | [ Delta ] T1-TTarget|≤T1If so, maintaining the duty ratio of the water pump to operate; if not, go to step S22; s22, judging whether | [ Delta ] T1-TTarget|≤T2If yes, go to step S23; if not, adjusting the duty ratio of the water pump according to a second preset parameter; s23, controlling the water pump to operate for a second preset time t according to preset parameters2Measuring and calculating the temperature difference delta T of inlet and outlet water1. According to Δ T1、TTargetThe difference relation of (2) is responded according to the situation, and the defects that the water pump changes frequently, the adjusting period is long and the like are avoided.
Preferably, the step S23 includes: s231, controlling the water pump to operate for a second preset time t according to preset parameters2(ii) a S232, judging whether the operation parameters of the heat pump unit are changed, if so, returning to the step S1; if not, measuring and calculating the temperature difference Delta T of inlet and outlet water2. The operating parameter may be an external fan speed, a compressor frequency, or a valve opening. Preferably, the operating parameter is an operating frequency of the compressor. If the compressor frequency is changed, the balance is broken or the reference for adjustment is changed, and the process proceeds to step S1 to realign Δ T1And (6) judging.
Preferably, the second preset parameter is: when Δ T1-TTarget≥T2If so, the duty ratio A of the water pump is A (1-b%); when Δ T1-TTarget≤-T2Then, the duty ratio a of the water pump is equal to a (1+ b%). If the detected temperature difference is larger than the target temperature difference, the unit capacity is larger, and the duty ratio of the water pump is reduced to improve the rotating speed; and when the detected temperature difference is smaller than the target temperature difference, increasing the duty ratio of the water pump to reduce the rotating speed of the water pump.
Preferably, the first preset time period t1A second preset time t2Respectively for 1-3min and 1-3 min; the T isTargetAt 4.8-5.2 deg.C, said T1、T2Respectively at 0.3-0.6 deg.C, 1.3-1.8 deg.C, and T00.4-0.6 ℃, 3-6% of a% and 4-10% of b%. Preferably, the first preset time period t1Second, secondA preset time duration t2Respectively for 2min and 2 min; the T isTargetAt 5.0 ℃ and said T1、T2Respectively at 0.5 deg.C, 1.5 deg.C, T0At 0.5 deg.C, a% is 5% and b% is 5%. This setting can realize the accurate control to business turn over temperature, prevents that the frequent change of compressor or business turn over water difference undersize that the business turn over water difference in temperature leads to the intensification slow, the poor phenomenon of user experience that leads to.
Compared with the prior art, the frequency conversion control method of the heat pump unit has the following beneficial effects: 1) according to the situation response of the difference value between the inlet and outlet temperature difference and the target temperature difference, the temperature difference is allowed to fluctuate within a certain range, so that accurate control is realized, frequent adjustment of a heat pump unit is avoided, and user experience is improved; 2) at a temperature difference T from the targetTargetWhen the temperature difference is relatively close, the duty ratio of the water pump is adjusted according to the temperature difference change trend by comparing the temperature difference changes in adjacent periods so as to avoid frequent fluctuation of the heat pump unit, shorten the adjustment period and ensure the performance and the operational reliability of the heat pump unit.
The invention also provides a frequency conversion control device of the heat pump unit, which comprises: the timing unit is used for recording the operation duration of the heat pump unit; the detection unit comprises a first sensor and a second sensor which are respectively used for detecting the temperature of inlet water and the temperature of outlet water; the judging unit is used for calculating and judging the magnitude relation between the temperature difference of inlet water and outlet water and a preset value according to the temperature of inlet water and outlet water, and judging whether the running frequency of a compressor of the heat pump unit changes within a preset time; and the control unit is used for adjusting the duty ratio of the water pump according to the judgment result of the judgment unit.
The invention also provides a computer storage medium, wherein the computer readable storage medium stores a computer program, and when the computer program is read and operated by a processor, the frequency conversion control method is realized. The invention also provides a heat pump unit, which comprises a computer readable storage medium and a processor, wherein the computer readable storage medium is used for storing a computer program, and the computer program is read by the processor and runs to realize the frequency conversion control method. The heat pump unit and the computer readable storage medium have the same beneficial effects as the variable frequency control method, and are not described herein again.
Drawings
FIG. 1 is a schematic structural diagram of a heat pump unit according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a frequency conversion control method of the heat pump unit according to embodiment 1 of the present invention;
FIG. 3 is a schematic flow chart of a frequency conversion control method of the heat pump unit according to embodiment 2 of the present invention;
fig. 4 is a schematic structural diagram of a frequency conversion control device of the heat pump unit according to the embodiment of the invention.
Description of reference numerals:
1-a compressor; 2-a commutation component; 3-an evaporator; 4-a filter; 5-a throttling device; 6-gas pipe stop valve; 7-a heat exchanger; 8-a waterway stop valve; 9-a water pump; 10-liquid pipe stop valve; 11-a gas-liquid separator; 12-a first sensor; 13-second sensor.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
As shown in fig. 1, a heat pump unit comprises a reversing assembly 2, an evaporator 3 and a heat exchanger 7 which are sequentially connected end to end, wherein the reversing assembly 2 is respectively connected with an outlet of a compressor 1 and an inlet of a gas-liquid separator 11, an outlet of the gas-liquid separator 11 is connected with the inlet of the compressor 1, the heat exchanger 7 is provided with a connecting pipe, and a waterway stop valve 8 is arranged on the connecting pipe; and the water body in the connecting pipe exchanges heat with the refrigerant flowing through the heat exchanger 7. The reversing component 2 is provided with a first valve port, a second valve port, a third valve port and a fourth valve port, wherein the first valve port is communicated with one of the second valve port and the third valve port, and the fourth valve port is communicated with the other of the second valve port and the third valve port; preferably, the reversing assembly 2 is a four-way valve. The water pump 9 is arranged on the connecting pipe, and a first sensor 12 and a second sensor 13 are respectively arranged at two ends of the heat exchanger 7 of the connecting pipe and used for detecting the water inlet temperature and the water outlet temperature. Preferably, a filter 4, a throttling device 5 and an air pipe stop valve 6 are sequentially arranged between the evaporator 3 and the heat exchanger 7, and a liquid pipe stop valve 10 is further arranged between the reversing assembly 2 and the heat exchanger 7; the throttling device 5 can be a capillary tube, an electronic expansion valve or a thermal expansion valve. In the operation process of the heat pump unit, a refrigerant circularly flows between the evaporator 3 and the heat exchanger 7, and the refrigeration or heating function is realized through the change of the temperature, the pressure and the state of the refrigerant. During heating, a refrigerant is firstly pressurized into high-temperature and high-pressure gas by the compressor 1, enters the heat exchanger 7, is condensed, liquefied and releases heat to form liquid, and simultaneously heats a water body flowing through the heat exchanger 7, so that the temperature of outlet water is higher than that of inlet water, and the water pump 9 drives the water body to be used by a user; after flowing out of the heat exchanger 7, the refrigerant is decompressed by the throttling device 5, enters the evaporator 3 in a low-temperature and low-pressure liquid state, becomes gas after being evaporated and absorbed heat, absorbs heat in the air, is changed into cold air, and enters the compressor 1 again after being discharged from the evaporator 3 to enter the next cycle.
The traditional heat pump unit generally adjusts the frequency of a compressor according to the temperature difference between inlet water and outlet water for correspondence, is greatly influenced by fluctuation, frequently changes and has long control period, and can influence the operation stability and safety of the compressor 1 in serious cases; even if the frequency conversion adjustment of the water pump 9 is adopted, the temperature difference between inlet water and outlet water is always in dynamic change, and the same problem is also faced.
Example 1
As shown in fig. 1, the present invention provides a frequency conversion control method for a heat pump unit, comprising: s1, controlling the water pump 9 to operate for a first preset time t according to preset parameters1Measuring and calculating the temperature difference delta T of inlet and outlet water1(ii) a The first preset time t1Is 1-3min, such as 2 min.
S2, when T is satisfied1＜|△T1-TTarget|＜T2When the water pump 9 is controlled to operateA second preset duration t2Measuring and calculating the temperature difference delta T of inlet and outlet water2Wherein T isTargetThe target temperature difference for water inlet and outlet is 4.8-5.2 deg.C, such as 5.0 deg.C; the T is1At a first predetermined temperature, e.g. 0.3-0.6 deg.C, said T2At a second predetermined temperature, e.g., 1.3-1.8 deg.C; preferably, said T is1、T2Respectively at 0.5 deg.C and 1.5 deg.C.
The step S2 includes: s21, judging whether | [ Delta ] T1-TTarget|≤T1If yes, maintaining the duty ratio of the water pump 9 to operate; if not, go to step S22;
s22, judging whether | [ Delta ] T1-TTarget|≤T2If yes, go to step S23; if not, adjusting the duty ratio of the water pump 9 according to a second preset parameter;
in particular, when Δ T1-TTarget≥T2If so, the duty ratio a of the water pump 9 is a (1-b%); when Δ T1-TTarget≤-T2Then, the duty cycle a of the water pump 9 is equal to a (1+ b%), wherein b% is 4-10%, for example, 5%, 8%, 9%, etc. If the detected temperature difference is larger than the target temperature difference, the heating capacity of the heat pump unit is larger, and the rotating speed of the water pump 9 is not matched with the unit capacity, the duty ratio of the water pump 9 is reduced to improve the rotating speed; when the detected temperature difference is smaller than the target temperature difference, the duty ratio of the water pump 9 is increased to reduce the rotation speed thereof.
S23, controlling the water pump 9 to operate for a second preset time t according to preset parameters2Measuring and calculating the temperature difference delta T of inlet and outlet water1. According to Δ T1、TTargetThe difference relation is responded according to the situation, so that the defects that the water pump 9 is frequently changed, the adjusting period is long and the like are avoided; the second preset time t2Is 1-3min, such as 2 min.
Preferably, the step S23 includes: s231, controlling the water pump 9 to operate for a second preset time t according to preset parameters2(ii) a S232, judging whether the operation parameters of the heat pump unit are changed, if so, returning to the step S1; if not, measuring and calculating the temperature difference Delta T of inlet and outlet water2. If the frequency of the compressor 1 changes, thenThe above-mentioned balance is broken or the reference for adjustment is changed, and the process proceeds to step S1 to realign Δ T1And (6) judging. The operation parameter may be an operation frequency of the compressor 1, a rotation speed of the outer fan, or an opening degree of the valve body, or the like.
S3, judging whether | delta T is satisfied1-△T2|＞T0If so, adjusting the duty ratio of the water pump according to a first preset parameter; the T is0From 0.4 to 0.6 ℃, for example 0.5 ℃; if not, the duty ratio of the water pump 9 is maintained to operate.
In particular, when Δ T1-△T2＞T0Then, the duty ratio a of the water pump 9 is equal to a (1+ a%); when Δ T1-△T2＜-T0Then the duty cycle a of the water pump 9 is a (1-a%), wherein a% is 3-6%, for example 5%; when the temperature difference T is from the targetTargetWhen the temperature difference is higher, the change of the temperature difference of the adjacent periods is compared, and if the temperature difference is still higher, which indicates that the capacity of the unit is higher, the duty ratio of the water pump 9 is increased to reduce the rotating speed; when the temperature difference is still reduced, the duty ratio of the water pump 9 needs to be reduced to improve the rotating speed of the water pump; if the temperature difference does not change much in the two periods, the current duty ratio is maintained to prevent the water pump 9 from fluctuating frequently.
Compared with the frequent adjustment of the frequency of the compressor 1 of the heat pump unit, the frequency conversion control method of the heat pump unit is T-shapedTargetFor the benchmark, allow it to fluctuate in certain extent, realize the frequent adjustment of avoiding water pump 9, compressor 1 simultaneously to the accurate control of business turn over temperature, prevent that the compressor 1 frequent change that the business turn over temperature difference is too big leads to or the business turn over temperature difference undersize leads to the slow phenomenon of intensification, user experience is good.
Example 2
As shown in fig. 3, a frequency conversion control method for a heat pump unit includes: s1, starting the water pump, controlling the water pump 9 to operate for 2min at the initial duty ratio A, and utilizing the first sensor 12 and the second sensor 13 to adjust the water inlet temperature T and the water outlet temperature T01、T02Detecting, calculating the temperature difference delta T of inlet and outlet water1Wherein Δ T1＝|T01-T02|。
S2, judging whether | [ Delta ] T1-TTarget|≤T1Wherein T isTarget、T1Respectively at 5 ℃ and 0.5 ℃, and if yes, maintaining the duty ratio of the water pump 9 to operate; if not, go to step S3; the control prevents frequent adjustment of the water pump 9 based on a return difference of 0.5 deg.c (i.e. between 4.5 deg.c and 5.5 deg.c) based on a 5 deg.c difference.
S3, judging whether | [ Delta ] T1-TTarget|≤T2Wherein T is2If the temperature is 1.5 ℃, the process goes to step S4; if Δ T1-TTarget≥T2If so, the duty ratio a of the water pump 9 is equal to a (1-b%), and if the water pump 9 is adjusted to reduce the duty ratio by 5%; if Δ T1-TTarget≤-T2Then, the duty cycle a of the water pump 9 is equal to a (1+ b%), and the water pump 9 is adjusted by increasing the duty cycle by 5%. When the temperature difference is obviously overlarge or undersize after the unit is started, namely the delta T at the moment1< 3.5 ℃ or. DELTA.T1Above 6.5 ℃, the water pump 9 directly adjusts the duty cycle for fast response.
S4, controlling the water pump 9 to operate for 2min according to preset parameters, judging whether the frequency of the compressor 1 changes within 2min, if so, returning to the step S1; if not, go to step S5;
s5, measuring and calculating the temperature difference delta T of inlet and outlet water2Judging whether or not, | DeltaT is satisfied1-△T2If | is greater than 0.5 deg.C, if | Delta T1-△T2When the temperature is less than or equal to 0.5 ℃, the duty ratio of the water pump 9 is maintained to operate; if Δ T1-△T2If the duty ratio of the water pump 9 is greater than 0.5 ℃, the duty ratio a of the water pump 9 is a (1+ a%), and if the water pump 9 is adjusted by increasing the duty ratio by 5%; if Δ T1-△T2-0.5 ℃, the duty cycle a of the water pump 9 is a (1-a%), e.g. the water pump 9 is adjusted to reduce the duty cycle by 5%. When the temperature difference between the unit and the target is close (namely the temperature difference is 3.5-4.5 ℃ and 5.5-6.5 ℃), comparing the two temperature differences in the adjacent detection periods, and when the detected temperature difference is still rising, indicating that the unit has larger capacity, controlling the water pump 9 to increase the duty ratio to reduce the rotating speed; when the temperature difference is detected to be reduced, the water pump 9 is controlled to reduceSmall duty cycle to increase rotational speed; when the two temperature differences fluctuate within a small range, the duty ratio of the water pump 9 is not changed to prevent frequent fluctuations.
As shown in fig. 4, the present invention further provides a frequency conversion control device of a heat pump unit, including: the timing unit is used for recording the operation duration of the heat pump unit; the detection unit comprises a first sensor 12 and a second sensor 13 which are respectively used for detecting the temperature of inlet water and the temperature of outlet water; the judging unit is used for calculating and judging the size relation between the temperature difference of inlet water and outlet water and a preset value according to the temperature of inlet water and outlet water, and judging whether the running frequency of the compressor 1 of the heat pump unit changes within a preset time; and the control unit is used for adjusting the duty ratio of the water pump 9 according to the judgment result of the judgment unit.
The invention also provides a computer storage medium, wherein the computer readable storage medium stores a computer program, and when the computer program is read and operated by a processor, the frequency conversion control method is realized. The computer readable storage medium may be a readable storage medium or a readable signal medium, such as: u disk, removable hard disk, ROM, RAM, magnetic or optical disk, etc. In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The invention also provides a heat pump unit, which comprises a computer readable storage medium and a processor, wherein the computer readable storage medium is used for storing a computer program, and the computer program is read by the processor and runs to realize the frequency conversion control method. The heat pump unit and the computer readable storage medium have the same beneficial effects as the variable frequency control method, and are not described herein again.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A frequency conversion control method of a heat pump unit is characterized by comprising the following steps: s1, controlling the water pump (9) to operate for a first preset time t according to preset parameters1Measuring and calculating the temperature difference delta T of inlet and outlet water1(ii) a S2, when T is satisfied1＜|△T1-TTarget|＜T2When the water pump (9) is controlled to operate for a second preset time t2Measuring and calculating the temperature difference delta T of inlet and outlet water2Wherein T isTargetThe target temperature difference of water inlet and outlet is obtained; s3, judging whether | delta T is satisfied1-△T2|＞T0If yes, adjusting the duty ratio of the water pump (9) according to a first preset parameter; if not, the duty ratio of the water pump (9) is maintained to operate.
2. The variable frequency control method of a heat pump unit according to claim 1, wherein the first preset parameter is: when Δ T1-△T2＞T0If so, the duty ratio A of the water pump (9) is A (1+ a%); when Δ T1-△T2＜-T0And when the water pump (9) is started, the duty ratio A of the water pump (9) is A (1-a%).
3. The variable frequency control method of a heat pump unit according to claim 1 or 2, wherein the step S2 includes: s21, judging whether | [ Delta ] T1-TTarget|≤T1If yes, maintaining the duty ratio of the water pump (9) to operate; if not, go to step S22; s22, judging whether | [ Delta ] T1-TTarget|≤T2If yes, go to step S23; if not, adjusting the duty ratio of the water pump (9) according to a second preset parameter; s23, controlling waterThe pump (9) operates for a second preset time period t according to preset parameters2Measuring and calculating the temperature difference delta T of inlet and outlet water1。
4. The frequency conversion control method of a heat pump unit according to claim 3, wherein the step S23 includes: s231, controlling the water pump (9) to operate for a second preset time t according to preset parameters2；
S232, judging whether the operation parameters of the heat pump unit are changed, if so, returning to the step S1; if not, measuring and calculating the temperature difference Delta T of inlet and outlet water2。
5. A variable frequency control method of a heat pump unit according to claim 4, characterized in that the operating parameter is the operating frequency of the compressor (1).
6. The frequency conversion control method of the heat pump unit according to claim 3, wherein the second preset parameter is: when Δ T1-TTarget≥T2If so, the duty ratio A of the water pump (9) is A (1-b%); when Δ T1-TTarget≤-T2And if so, the duty ratio A of the water pump (9) is A (1+ b%).
7. The variable frequency control method of a heat pump unit according to claim 6, wherein the first preset time period t1A second preset time t2Respectively for 1-3min and 1-3 min; the T isTargetAt 4.8-5.2 deg.C, said T1、T2Respectively at 0.3-0.6 deg.C, 1.3-1.8 deg.C, and T00.4-0.6 ℃, 3-6% of a% and 4-10% of b%.
8. A frequency conversion control device of a heat pump unit is characterized by comprising: the timing unit is used for recording the operation duration of the heat pump unit; the detection unit comprises a first sensor (12) and a second sensor (13) which are respectively used for detecting the temperature of inlet water and the temperature of outlet water; the judging unit is used for calculating and judging the size relation between the temperature difference of inlet water and outlet water and a preset value according to the temperature of inlet water and outlet water, and judging whether the running frequency of a compressor (1) of the heat pump unit changes within a preset time; and the control unit is used for adjusting the duty ratio of the water pump (9) according to the judgment result of the judgment unit.
9. A computer storage medium, characterized in that the computer readable storage medium stores a computer program which, when read and executed by a processor, implements the variable frequency control method according to any one of claims 1-7.
10. A heat pump unit comprising a computer readable storage medium storing a computer program and a processor, the computer program when read and executed by the processor implementing a variable frequency control method as claimed in any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110869798.3A CN113606782B (en) | 2021-07-30 | 2021-07-30 | Variable frequency control method and device of heat pump unit, storage medium and heat pump unit |
Applications Claiming Priority (1)
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| CN114294870A (en) * | 2021-12-21 | 2022-04-08 | 珠海格力电器股份有限公司 | Control method, device and equipment of heat pump air conditioning system and storage medium |
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