CN107131651B - Device and method for stably adjusting water temperature - Google Patents
Device and method for stably adjusting water temperature Download PDFInfo
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- CN107131651B CN107131651B CN201710249410.3A CN201710249410A CN107131651B CN 107131651 B CN107131651 B CN 107131651B CN 201710249410 A CN201710249410 A CN 201710249410A CN 107131651 B CN107131651 B CN 107131651B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 151
- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000001105 regulatory effect Effects 0.000 claims abstract description 43
- 230000008020 evaporation Effects 0.000 claims abstract description 12
- 238000001704 evaporation Methods 0.000 claims abstract description 12
- 238000007710 freezing Methods 0.000 claims description 5
- 238000001514 detection method Methods 0.000 description 5
- 230000000087 stabilizing effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
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Classifications
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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
-
- 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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a device and a method for stably adjusting water temperature, the device comprises a water tank, a circulating water pump, a stepping proportion three-way adjusting valve, a heat pump system and a control circuit, wherein an outlet of the water tank is communicated to a water inlet of the heat pump system through the circulating water pump, a water outlet of the heat pump system is communicated to a water inlet of a three-way valve, a second water outlet of the three-way valve is communicated to a water inlet of the heat pump system through a bypass water path, a first water outlet of the three-way valve is communicated to an inlet of the water tank, and an output end of the control circuit. According to the invention, the water temperature is regulated in real time through the bypass waterway and is calculated according to the real-time evaporation temperature in the heat pump system, so that the calculation result does not have time lag, the actual outlet water temperature is calculated and regulated, and the water temperature fluctuation can be ensured to be small, thereby realizing stable regulation. The device and the method for stably adjusting the water temperature can be widely applied to the field of heat pumps.
Description
Technical Field
The invention relates to the field of heat pumps, in particular to a device and a method for stably adjusting water temperature.
Background
In the prior art, the method for stabilizing the water temperature of the heat pump usually performs PID adjustment according to the inlet-outlet temperature difference so as to achieve the purpose of stabilizing the water temperature, and although the method can meet the purpose of stabilizing the water temperature, the following problems still exist in the actual adjustment:
in the prior art, PID adjustment is usually carried out according to the outlet water temperature difference, and because the water temperature detection in the water tank has certain time lag, inaccurate detection is easily caused, so that PID adjustment is frequent, and large fluctuation can occur, so that the stability of the outlet water temperature is influenced; in addition, the conventional heat pump heating system and the unit cannot start anti-freezing protection when the power is off, so that pipelines or sleeves are easily frost-cracked.
Disclosure of Invention
In order to solve the technical problems, the invention aims to: provided is a device for stably adjusting water temperature, which avoids water temperature fluctuation caused by temperature detection hysteresis.
In order to solve the above technical problems, another object of the present invention is to: a method for stably adjusting water temperature is provided, which avoids water temperature fluctuation caused by temperature detection hysteresis.
The technical scheme adopted by the invention is as follows: a device for stably regulating water temperature comprises a water tank, a circulating water pump, a stepping proportion three-way regulating valve, a heat pump system and a control circuit, wherein an outlet of the water tank is communicated to a water inlet of the heat pump system through the circulating water pump, a water outlet of the heat pump system is communicated to a water inlet of the stepping proportion three-way regulating valve, a second water outlet of the stepping proportion three-way regulating valve is communicated to a water inlet of the heat pump system through a bypass water path, a first water outlet of the stepping proportion three-way regulating valve is communicated to an inlet of the water tank, and an output end of the control circuit is connected with a.
Further, the water heater also comprises a power supply and a pipeline water temperature sensor arranged in a pipeline communicated with the water tank, wherein the pipeline water temperature sensor is connected with the control circuit.
The other technical scheme adopted by the invention is as follows: a method for stably regulating water temperature comprises the following steps:
before the circulating water pump is started, the stepping proportion three-way regulating valve is regulated to zero;
starting a circulating water pump, judging the water outlet temperature of a heat exchanger in a heat pump system, starting a stepping proportion three-way regulating valve to regulate the water outlet temperature of the heat exchanger to be below 42 ℃ if the water outlet temperature is higher than 42 ℃, and then closing the stepping proportion three-way regulating valve;
and starting the compressor, calculating a temperature difference △ t according to the real-time evaporation temperature of the heat pump system, calculating an actual outlet water temperature according to the target outlet water temperature and the temperature difference △ t, and adjusting the stepping proportion three-way adjusting valve according to the ratio of the actual outlet water temperature to the target outlet water temperature.
Furthermore, the calculation formula of the temperature difference △ t calculated according to the real-time evaporation temperature of the heat pump system is △ t = P/(C.V), wherein C is the specific heat capacity, V is the water speed, P is the unit capacity, and the different real-time evaporation temperatures correspond to different unit capacity values according to the compressor capacity curve.
Further, when the temperature of the outlet water of the heat exchanger in the heat pump system is lower than 40 ℃ in the water level adjusting process, the stepping proportion three-way adjusting valve is adjusted to zero, and all the steps are executed again according to the sequence.
Further, when the power failure of the heat pump system is detected, the water temperature of the pipeline is judged, if the water temperature is lower than a set anti-freezing point, the stepping proportion three-way regulating valve is opened, water in the pipeline is enabled to be discharged outwards until the temperature rises to a safety set point, and the stepping proportion three-way regulating valve is closed.
The invention has the beneficial effects that: the water temperature is regulated in real time through the bypass waterway, so that the water temperature fluctuation and frequent regulation caused by the hysteresis between the water temperature detection and the regulation process in the PID regulation process are avoided, and the stable regulation of the water temperature is realized; meanwhile, the protection of the pipeline after the system stops working is ensured by detecting the temperature of the pipeline and the self-contained power supply, so that the frost cracking condition is avoided.
The invention has the following beneficial effects: the water temperature is adjusted in real time through the bypass waterway and is calculated according to the real-time evaporation temperature in the heat pump system, so that the calculation result does not have time lag, the actual outlet water temperature is calculated and adjusted, the water temperature fluctuation can be ensured to be small, and the stable adjustment is realized; meanwhile, the protection of the pipeline after the system stops working is ensured by detecting the temperature of the pipeline and the self-contained power supply, so that the frost cracking condition is avoided.
Drawings
FIG. 1 is a schematic diagram of the piping of the apparatus of the present invention;
FIG. 2 is a schematic overall view of a step-by-step proportional three-way regulator valve in the apparatus of the present invention;
FIG. 3 is a schematic cross-sectional view of a step-by-step proportional three-way regulator in the apparatus of the present invention;
FIG. 4 is a flow chart of the method steps of the present invention;
FIG. 5 is a graph of compressor capacity in the process of the present invention.
In the figure: 1. a water tank; 2. a water circulating pump; 3. a stepping proportion three-way regulating valve; 4. a heat pump system; 5. a bypass waterway; 6. a handle; 7. a rotating shaft; 8. a waterproof housing; 9. a stepping motor; 10. a coupling; 11. a valve body; 12. a water inlet; 13. a first water outlet; 14. a second water outlet.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
referring to fig. 1, a device for stably adjusting water temperature comprises a water tank 1, a circulating water pump 2, a stepping proportion three-way adjusting valve 3, a heat pump system 4 and a control circuit, wherein an outlet of the water tank 1 is communicated to a water inlet of the heat pump system 4 through the circulating water pump 2, a water outlet of the heat pump system 4 is communicated to a water inlet of the stepping proportion three-way adjusting valve 3, a second water outlet of the stepping proportion three-way adjusting valve 3 is communicated to a water inlet of the heat pump system 4 through a bypass water path 5, a first water outlet of the stepping proportion three-way adjusting valve 3 is communicated to an inlet of the water tank 1, and an output end of the control circuit is connected.
The specific structure of the step ratio three-way regulating valve 3 can refer to fig. 2 and 3, a step motor 9 is arranged on a valve body 11, a handle 6 is connected with a rotating shaft 7 of the step motor 9 through a coupler 10, and the ratio of a first water outlet 13 to a second water outlet 14 is controlled through the step motor 9.
Further as a preferred embodiment, the water-saving device further comprises a power supply and a pipeline water temperature sensor arranged in a pipeline communicated with the water tank 1, wherein the pipeline water temperature sensor is connected with the control circuit.
The power supply can drive a low-power stepping proportion three-way regulating valve, when the system power failure is detected, the water temperature of the pipeline is judged, if the water temperature is lower than a set anti-freezing point, the stepping proportion three-way regulating valve is opened, water in the pipeline is discharged outwards, and the stepping proportion three-way regulating valve is closed until the temperature rises to a safety set point.
Referring to fig. 4, a method for stably adjusting water temperature includes the following steps:
before the circulating water pump is started, the stepping proportion three-way regulating valve is regulated to zero; for example, the water pump is turned to zero 1 minute before the water pump is turned on, and water flow does not pass through the bypass pipeline after the water pump is turned on.
Starting a circulating water pump, judging the water outlet temperature of a heat exchanger in a heat pump system, starting a stepping proportion three-way regulating valve to regulate the water outlet temperature of the heat exchanger to be below 42 ℃ if the water outlet temperature is higher than 42 ℃, and then closing the stepping proportion three-way regulating valve; the temperature of the water outlet of the heat exchanger is adjusted to be below 42 ℃, so that high pressure jump when the compressor is started can be avoided, the overload protector is disconnected, and the equipment stops running.
The compressor is started, the temperature difference △ t is calculated according to the real-time evaporation temperature of the heat pump system, the actual outlet water temperature is calculated according to the target outlet water temperature and the temperature difference △ t, the step ratio three-way regulating valve is regulated according to the ratio of the actual outlet water temperature to the target outlet water temperature, namely when the actual outlet water temperature is lower than the target outlet water temperature, the step ratio three-way regulating valve is opened, the bypass quantity of the bypass water path 5 is increased, when the actual outlet water temperature is higher than the target outlet water temperature, the step ratio three-way regulating valve is closed down, the bypass quantity is reduced, and the temperature difference △ t is calculated according to the real-time evaporation temperature in the heat pump system, so that the calculation result does not have time lag, the actual outlet water temperature is calculated and then regulated.
Further as a preferred embodiment, the calculation formula of the temperature difference △ t according to the real-time evaporation temperature of the heat pump system is △ t = P/(C.V), where C is the specific heat capacity, V is the water velocity, and P is the unit capacity, and the different real-time evaporation temperatures correspond to different unit capacity values according to the compressor capacity curve, and a specific compressor capacity curve can refer to fig. 5.
Further as a preferred embodiment, when the temperature of the outlet water of the heat exchanger in the heat pump system is lower than 40 ℃ in the water level adjusting process, the stepping proportion three-way adjusting valve is adjusted to zero, and all the steps are executed again according to the sequence.
Further as a preferred embodiment, when the power failure of the heat pump system is detected, the water temperature of the pipeline is judged, if the water temperature is lower than a set anti-freezing point, the stepping proportion three-way regulating valve is opened to discharge the water in the pipeline outwards until the temperature rises to a safety set point, and the stepping proportion three-way regulating valve is closed.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (3)
1. A method for stably regulating water temperature is characterized by comprising the following steps:
before the circulating water pump is started, the stepping proportion three-way regulating valve is regulated to zero;
starting a circulating water pump, judging the water outlet temperature of a heat exchanger in a heat pump system, starting a stepping proportion three-way regulating valve to regulate the water outlet temperature of the heat exchanger to be below 42 ℃ if the water outlet temperature is higher than 42 ℃, and then closing the stepping proportion three-way regulating valve;
starting a compressor, calculating a temperature difference △ t according to the real-time evaporation temperature of the heat pump system, calculating an actual outlet water temperature according to the target outlet water temperature and the temperature difference △ t, and adjusting the stepping proportion three-way adjusting valve according to the ratio of the actual outlet water temperature to the target outlet water temperature;
the circulating water pump is communicated to a water inlet of a heat pump system, a water outlet of the heat pump system is communicated to a water inlet of a stepping proportion three-way regulating valve, a second water outlet of the stepping proportion three-way regulating valve is communicated to a water inlet of the heat pump system through a bypass water path, and a first water outlet of the stepping proportion three-way regulating valve is communicated to a water tank inlet;
the calculation formula of the temperature difference △ t according to the real-time evaporation temperature of the heat pump system is that △ t is P/(C.V), wherein C is specific heat capacity, V is water speed, P is unit capacity, and the real-time evaporation temperature corresponds to different unit capacity values according to a compressor capacity curve.
2. A method of stably regulating water temperature according to claim 1, wherein: and when the water outlet temperature of a heat exchanger in the heat pump system is lower than 40 ℃ in the water level adjusting process, adjusting the stepping proportion three-way adjusting valve to zero, and executing all the steps again according to the sequence.
3. A method of stably regulating water temperature according to claim 1, wherein: when the power failure of the heat pump system is detected, the water temperature of the pipeline is judged, if the water temperature is lower than a set anti-freezing point, the stepping proportion three-way regulating valve is opened, water in the pipeline is enabled to be discharged outwards until the temperature rises to a safety set point, and the stepping proportion three-way regulating valve is closed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710249410.3A CN107131651B (en) | 2017-04-17 | 2017-04-17 | Device and method for stably adjusting water temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710249410.3A CN107131651B (en) | 2017-04-17 | 2017-04-17 | Device and method for stably adjusting water temperature |
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| Publication Number | Publication Date |
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| CN107131651A CN107131651A (en) | 2017-09-05 |
| CN107131651B true CN107131651B (en) | 2020-06-30 |
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| CN201710249410.3A Active CN107131651B (en) | 2017-04-17 | 2017-04-17 | Device and method for stably adjusting water temperature |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP7417049B2 (en) * | 2019-11-25 | 2024-01-18 | 株式会社ノーリツ | water heater |
| JP7393633B2 (en) * | 2019-12-12 | 2023-12-07 | 株式会社ノーリツ | water heater |
| CN111853926A (en) * | 2020-06-01 | 2020-10-30 | 深圳市合信达控制系统有限公司 | Method, device, terminal and storage medium for preventing wall-hanging stove from generating condensed water |
| CN111830933B (en) * | 2020-07-16 | 2022-03-29 | 广东亨通光电科技有限公司 | A heating element detection system, method, device and storage medium |
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|---|---|---|---|---|
| JP2005098568A (en) * | 2003-09-24 | 2005-04-14 | Matsushita Electric Ind Co Ltd | Water heater |
| CN1749670A (en) * | 2004-09-15 | 2006-03-22 | 松下电器产业株式会社 | Heat pump heat storage device |
| CN201053758Y (en) * | 2007-06-04 | 2008-04-30 | 南京工业大学 | Two-stage compressed air source heat pump water heater |
| CN102725591A (en) * | 2010-03-05 | 2012-10-10 | 三菱重工业株式会社 | Hot water heat pump and method for controlling same |
| EP2853839A1 (en) * | 2013-09-27 | 2015-04-01 | Mitsubishi Heavy Industries, Ltd. | Hot water supply system and control method thereof |
| CN105276843A (en) * | 2015-11-19 | 2016-01-27 | 沃逸新能源科技（江苏）有限公司 | Heat pump hot water and solar hot water control system |
-
2017
- 2017-04-17 CN CN201710249410.3A patent/CN107131651B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005098568A (en) * | 2003-09-24 | 2005-04-14 | Matsushita Electric Ind Co Ltd | Water heater |
| CN1749670A (en) * | 2004-09-15 | 2006-03-22 | 松下电器产业株式会社 | Heat pump heat storage device |
| CN201053758Y (en) * | 2007-06-04 | 2008-04-30 | 南京工业大学 | Two-stage compressed air source heat pump water heater |
| CN102725591A (en) * | 2010-03-05 | 2012-10-10 | 三菱重工业株式会社 | Hot water heat pump and method for controlling same |
| EP2853839A1 (en) * | 2013-09-27 | 2015-04-01 | Mitsubishi Heavy Industries, Ltd. | Hot water supply system and control method thereof |
| CN105276843A (en) * | 2015-11-19 | 2016-01-27 | 沃逸新能源科技（江苏）有限公司 | Heat pump hot water and solar hot water control system |
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| CN107131651A (en) | 2017-09-05 |
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