CN104482651A - Air source heat pump water heating unit and defrosting control method thereof - Google Patents
Air source heat pump water heating unit and defrosting control method thereof Download PDFInfo
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- CN104482651A CN104482651A CN201410845055.2A CN201410845055A CN104482651A CN 104482651 A CN104482651 A CN 104482651A CN 201410845055 A CN201410845055 A CN 201410845055A CN 104482651 A CN104482651 A CN 104482651A
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Abstract
The invention provides an efficient-defrosting air source heat pump water heating unit and a defrosting control method thereof. The air source heat pump water heating unit comprises a compressor, a condenser, an expansion throttling device, an evaporator, a gas-liquid separator and a controller, wherein an exhaust opening of the compressor is connected with an inlet of the condenser through a first electromagnetic valve, an outlet of the condenser is connected with an inlet of the evaporator sequentially through a drying and filtering device, a second electromagnetic valve, a one-way valve and the expansion throttling device, an inlet of the compressor is connected with an outlet of the evaporator through the gas-liquid separator, an outlet of the compressor is connected with an inlet of the expansion throttling device through a bypass electromagnetic valve, and the inlet of the expansion throttling device is connected with an outlet of the expansion throttling device through a third electromagnetic valve and a pore plate. The air source heat pump water heating unit provided by the invention is wide in application region range and high in defrosting efficiency, can be used for solving intractable problems resulting from a defrosting process in the prior art and can operate for a long term in a safe, efficient and stable manner.
Description
Technical field
The present invention relates to air-conditioner set and heat technical field, especially relate to a kind of air friction drag and defrosting control method thereof of highly effective defrosting.
Background technology
Heat pump energy-conserving technology, as state key power-saving technology promotion project, has obtained in China and has promoted widely, in recent years air friction drag due to the feature such as energy-conservation, safe in an increasingly wide range of applications in China.
But air source heat pump is greatly limited in the popularization in northern China market, main cause is the restriction being subject to weather conditions.When outside air temperature is spent low, the surface of air friction drag evaporimeter just can frosting, and reduce heat transfer effect, cause heating capacity to reduce, even unit cannot normally start.At present, common Defrost mode has fin electric heated defrosting, heat water-spraying's defrosting, hot gas defrosting and four-way valve defrosting, specific as follows: 1, fin electric heated defrosting power consumption is large not energy-conservation, portion of energy can be lost in air, and easily occurs the phenomenon of defrost difficulty when environment temperature is lower; 2, heat water-spraying's defrosting is large to the waste of water resource, and if in time remaining water Ex-all, can not can accelerate the speed of frosting on the contrary in next defrost process after trickle; If 3, hot gas defrosting working medium is not evaporated, just can not form gas, will affect the air-breathing of compressor, if air-breathing is bad, the oil return of compressor is also more difficult, and oil return is bad probably burns out compressor; 4, four-way valve defrosting system is in the reverse cycle defrosting stage, not only can not provide heat to indoor, can absorb heat indoor on the contrary, have impact on heating operation efficiency, causes water temperature to reduce, and cross valve frequently commutates and can affect its reliability and life-span.
Summary of the invention
The object of the invention is the air friction drag and the defrosting control method thereof that propose a kind of highly effective defrosting, it has, and heat exchange efficiency be high, defrosting speed is fast, the energy-conservation and reliable advantage of security of system.
Air friction drag of the present invention comprises compressor, condenser, expansion throttling device, evaporimeter, the controller of gas-liquid separator and the work of control all parts, key is that the exhaust outlet of described compressor is connected by the entrance of the first magnetic valve with described condenser, the outlet of described condenser passes through device for drying and filtering successively, second magnetic valve, check valve, expansion throttling device is connected with the entrance of described evaporimeter, the entrance of described compressor is connected by the outlet of gas-liquid separator with described evaporimeter, the outlet of described compressor is connected by bypass solenoid valve with the entrance of described expansion throttling device, the entrance of described expansion throttling device is by the 3rd magnetic valve, orifice plate is connected with the outlet of expansion throttling device.
Further, for convenience of controlling, described controller comprises CPU and data acquisition module, and the outlet of described compressor is provided with the first pressure sensor be connected with this controller, and the entrance of described compressor is provided with the second pressure sensor and temperature sensor that are connected with this controller.
The operation principle of this air friction drag is as follows:
Liquid refrigerant in evaporimeter absorbs the heat in outer gas, be evaporated to gaseous refrigerant, carry out after gas-liquid separation through gas-liquid separator, absorbed by the air entry of compressor and become high temperature and high pressure gas, then enter in condenser by the first magnetic valve, the liquid refrigerant of high pressure is cooled to by the cold water from user side, the heat be wherein pulled away is passed feedwater, the water outlet of user side just becomes hot water, then liquid refrigerant is through device for drying and filtering, second magnetic valve, check valve enters expansion throttling device and becomes low-pressure, liquid refrigerant and get back in evaporimeter, thus circulation heats again and again.
The defrosting control method of this air friction drag comprises the steps: when controller detects the pressure of suction port of compressor lower than low pressure threshold by the second pressure sensor, controller opens bypass solenoid valve, 3rd magnetic valve, close the first magnetic valve, second magnetic valve, the high temperature and high pressure gas that compressor is discharged is after bypass solenoid valve, enter expansion throttling device simultaneously, 3rd magnetic valve and orifice plate, the frost of evaporator surface melts by the high temperature refrigerant utilizing compressor to discharge to be removed, then by gas-liquid separator, refrigerant air-liquid is separated, gaseous refrigerant is sucked by the air entry of this compressor, when by the second pressure sensor, controller detects that the pressure of suction port of compressor reaches low pressure threshold, just can open the first magnetic valve, the second magnetic valve, close bypass solenoid valve, the 3rd magnetic valve, defrost process completes.
Further, in defrost process, if when controller detects the pressure of compressor outlet higher than HVT high voltage threshold by the first pressure sensor, just can open the first magnetic valve, if just the first magnetic valve can be closed when detecting that high pressure arrives HVT high voltage threshold; When by the second pressure sensor, controller detects that the pressure of suction port of compressor just can open the second magnetic valve lower than during setting value, if just the second magnetic valve can be closed when detecting that low pressure arrives low pressure threshold, improve the behavior in service that unit safety is stable.
The setting of above-mentioned bypass solenoid valve, the 3rd magnetic valve and orifice plate can realize highly effective defrosting, solves the defect that current various Defrost method brings.
Described condenser is the special condenser of air-source heat pump hot water, has heat exchange efficiency high, the advantage of low cost of manufacture.
The air friction drag of highly effective defrosting of the present invention solves the impact by meteorological condition when running in the winter time, can be widely used in the south and north of China; And the power consumption that defrosts is little, defrosting time is short and in time water Ex-all, heat supply can be recovered fast, original hot water temperature can be maintained during defrosting, unnecessary energy loss can be avoided, serve good energy-saving effect, improve the comprehensive energy efficiency of unit; And system is simple, efficiency is high, long service life and control precisely, to enable the operation of unit long-term safety efficient stable, have good market prospects.
Accompanying drawing explanation
Fig. 1 is the workflow schematic diagram of the air friction drag of the highly effective defrosting of embodiments of the invention.
In figure: 1-compressor; 2-first magnetic valve; 3-condenser; 4-device for drying and filtering; 5-second magnetic valve; 6-check valve; 7-expansion throttling device; 8-evaporimeter; 9-gas-liquid separator; 10-bypass solenoid valve; 11-the 3rd magnetic valve; 12-orifice plate; 13-first pressure sensor; 14-second pressure sensor; 15-temperature sensor; 16-controller.
Detailed description of the invention
Contrast accompanying drawing below, by the description to embodiment, the effect and operation principle etc. of the specific embodiment of the present invention as the mutual alignment between the shape of involved each component, structure, each several part and annexation, each several part are described in further detail.
Embodiment 1:
As shown in Figure 1: the air friction drag of the highly effective defrosting of the present embodiment, comprise compressor 1, condenser 3, expansion throttling device 7, evaporimeter 8, gas-liquid separator 9 and control the controller 16 of all parts work.
The exhaust outlet of compressor 1 is connected with the entrance of condenser 3 by the first magnetic valve 2, the outlet of condenser 3 is connected with the entrance of evaporimeter 8 by device for drying and filtering 4, second magnetic valve 5, check valve 6, expansion throttling device 7 successively, the entrance of compressor 1 is connected with the outlet of evaporimeter 8 by gas-liquid separator 9, the outlet of compressor 1 is connected by bypass solenoid valve 10 with the entrance of expansion throttling device 7, and the import of expansion throttling device 7 is connected with the outlet of expansion throttling device 7 by the 3rd magnetic valve 11, orifice plate 12.
Controller 16 comprises CPU and data acquisition module; the outlet of compressor 1 is provided with the first pressure sensor 13 be connected with controller 16; the entrance of compressor 1 is provided with the second pressure sensor 14 and temperature sensor 15 that are connected with controller 16; controller 16 can control compressor 1 accurately by load start and stop and defrost process, and is provided with man-machine interface and defencive function etc.
The operation principle of this air friction drag is as follows:
Liquid refrigerant in evaporimeter 8 absorbs the heat in outer gas, be evaporated to gaseous refrigerant, after this gas-liquid separator 9 carries out gas-liquid separation, absorbed by the air entry of this compressor 1 and become high temperature and high pressure gas, then the liquid refrigerant being cooled to high pressure in this condenser 3 by the cold water from user side is entered by the first magnetic valve 2, the heat be wherein pulled away is passed feedwater, the water outlet of user side just becomes hot water, then liquid refrigerant is through device for drying and filtering 4, second magnetic valve 5, check valve 6 enters this expansion throttling device 7, becoming low-pressure, liquid refrigerant gets back in this evaporimeter 8, thus circulation heats again and again.Described controller 16 precisely controls the aperture of expansion throttling device 7 according to the temperature that temperature sensor 15 detects, controls the reliability that refrigerant flow guarantees unit.
The defrosting control method of this air friction drag is as follows:
When this controller 16 detects low pressure lower than setting value according to the second pressure sensor 14, just bypass solenoid valve 10 can be opened, 3rd magnetic valve 11, close the first magnetic valve 2, second magnetic valve 5, the high temperature and high pressure gas that this compressor 1 is discharged enters expansion throttling device 7 through bypass solenoid valve 10 simultaneously, becoming low-pressure, liquid refrigerant after 3rd magnetic valve 11 and orifice plate 12 reducing pressure by regulating flow mix gets back in this evaporimeter 8, the frost on this evaporimeter 8 surface melts by the high temperature refrigerant utilizing this compressor 1 to discharge to be removed, then after coolant liquid being separated substantially completely by this gas-liquid separator 9 with gaseous state, gaseous refrigerant is sucked by the air entry of this compressor 1, thus extend the service life of compressor 1.When according to the second pressure sensor 14, this controller 16 detects that low pressure arrives setting value, just can open the first magnetic valve 2, second magnetic valve, close bypass solenoid valve 10, the 3rd magnetic valve 11, defrost process completes.In defrost process, when by this first pressure sensor 13, this controller 16 detects that high pressure just can open the first magnetic valve 2 higher than during setting value, if the first magnetic valve 2 just can be closed when detecting that high pressure arrives setting value; When by this second pressure sensor 14, this controller 16 detects that low pressure just can open the second magnetic valve 5 lower than during setting value, if the second magnetic valve 5 just can be closed when detecting that low pressure arrives setting value, improve the behavior in service that unit safety is stable.
Claims (4)
1. an air friction drag, comprise compressor, condenser, expansion throttling device, evaporimeter, the controller of gas-liquid separator and the work of control all parts, it is characterized in that the exhaust outlet of described compressor is connected by the entrance of the first magnetic valve with described condenser, the outlet of described condenser passes through device for drying and filtering successively, second magnetic valve, check valve, expansion throttling device is connected with the entrance of described evaporimeter, the entrance of described compressor is connected by the outlet of gas-liquid separator with described evaporimeter, the outlet of described compressor is connected by bypass solenoid valve with the entrance of described expansion throttling device, the entrance of described expansion throttling device is by the 3rd magnetic valve, orifice plate is connected with the outlet of expansion throttling device.
2. air friction drag according to claim 1, it is characterized in that described controller comprises CPU and data acquisition module, the outlet of described compressor is provided with the first pressure sensor be connected with this controller, and the entrance of described compressor is provided with the second pressure sensor and temperature sensor that are connected with this controller.
3. the defrosting control method of air friction drag according to claim 1 and 2, it is characterized in that comprising the steps: when controller detects the pressure of suction port of compressor lower than low pressure threshold by the second pressure sensor, controller opens bypass solenoid valve, 3rd magnetic valve, close the first magnetic valve, second magnetic valve, the high temperature and high pressure gas that compressor is discharged is after bypass solenoid valve, enter expansion throttling device simultaneously, 3rd magnetic valve and orifice plate, the frost of evaporator surface melts by the high temperature refrigerant utilizing compressor to discharge to be removed, then by gas-liquid separator, refrigerant air-liquid is separated, gaseous refrigerant is sucked by the air entry of this compressor, when by the second pressure sensor, controller detects that the pressure of suction port of compressor reaches low pressure threshold, just can open the first magnetic valve, the second magnetic valve, close bypass solenoid valve, the 3rd magnetic valve, defrost process completes.
4. the defrosting control method of air friction drag according to claim 3, it is characterized in that in defrost process, if when controller detects the pressure of compressor outlet higher than HVT high voltage threshold by the first pressure sensor, just the first magnetic valve can be opened, if just the first magnetic valve can be closed when detecting that high pressure arrives HVT high voltage threshold; When by the second pressure sensor, controller detects that the pressure of suction port of compressor just can open the second magnetic valve lower than during setting value, if just the second magnetic valve can be closed when detecting that low pressure arrives low pressure threshold.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106839518A (en) * | 2017-03-21 | 2017-06-13 | 昆山台佳机电有限公司 | The double cold and hot pump assemblys of integral type |
| CN107436046A (en) * | 2016-05-25 | 2017-12-05 | 广州宝丰冷冻仓储有限公司 | Hot gas defrosting devices and methods therefor for cold storage refrigerating system |
| CN108120039A (en) * | 2016-11-27 | 2018-06-05 | 侴乔力 | The heat pump cycle of compressor Suck and exhaust pressure Fast-Balance after shutdown |
| CN110595122A (en) * | 2018-06-12 | 2019-12-20 | 浙江盾安机电科技有限公司 | Defrosting control method, device and system for heat pump |
| CN111435050A (en) * | 2019-01-11 | 2020-07-21 | 青岛海尔智能技术研发有限公司 | Refrigerating system and refrigerator |
| CN112066610A (en) * | 2020-10-10 | 2020-12-11 | 昆山台佳机电有限公司 | Defrosting control system of air source heat pump unit |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107436046A (en) * | 2016-05-25 | 2017-12-05 | 广州宝丰冷冻仓储有限公司 | Hot gas defrosting devices and methods therefor for cold storage refrigerating system |
| CN108120039A (en) * | 2016-11-27 | 2018-06-05 | 侴乔力 | The heat pump cycle of compressor Suck and exhaust pressure Fast-Balance after shutdown |
| CN106839518A (en) * | 2017-03-21 | 2017-06-13 | 昆山台佳机电有限公司 | The double cold and hot pump assemblys of integral type |
| CN110595122A (en) * | 2018-06-12 | 2019-12-20 | 浙江盾安机电科技有限公司 | Defrosting control method, device and system for heat pump |
| CN110595122B (en) * | 2018-06-12 | 2022-03-08 | 浙江盾安机电科技有限公司 | Defrosting control method, device and system for heat pump |
| CN111435050A (en) * | 2019-01-11 | 2020-07-21 | 青岛海尔智能技术研发有限公司 | Refrigerating system and refrigerator |
| CN112066610A (en) * | 2020-10-10 | 2020-12-11 | 昆山台佳机电有限公司 | Defrosting control system of air source heat pump unit |
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| CN104482651B (en) | 2018-06-15 |
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