CN114754520A - Variable-frequency air source hot water unit with double-coil water tank and control method thereof - Google Patents
Variable-frequency air source hot water unit with double-coil water tank and control method thereof Download PDFInfo
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- CN114754520A CN114754520A CN202210288966.4A CN202210288966A CN114754520A CN 114754520 A CN114754520 A CN 114754520A CN 202210288966 A CN202210288966 A CN 202210288966A CN 114754520 A CN114754520 A CN 114754520A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 329
- 238000000034 method Methods 0.000 title claims abstract description 8
- 238000010257 thawing Methods 0.000 claims description 51
- 239000003507 refrigerant Substances 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
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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
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/325—Expansion valves having two or more valve members
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
- F25B41/42—Arrangements for diverging or converging flows, e.g. branch lines or junctions
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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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention discloses a variable-frequency air source hot water unit with double coil water tanks and a control method thereof.
Description
Technical Field
The invention relates to a variable-frequency air source hot water unit with double coil pipes and a control method thereof.
Background
Because air source heat pump's energy-efficient, more and more receive user's favor and pursuit, because the user uses the difference in area, the unit finned heat exchanger problem of frosting is an inevitable problem, traditional domestic air source only has a domestic coil pipe water tank, the unit adopts the cross valve switching-over to change the frost, and then can influence the temperature fluctuation, make user's comfort worsen, if the unit finned heat exchanger frosts when thick, when the cross valve can not normally commutate to change the frost, can lead to the compressor to inhale the band liquid, and then damage the compressor.
Disclosure of Invention
Aiming at the problems, the invention provides a variable-frequency air source hot water unit with a double-coil water tank and a control method thereof, which effectively solve the problems pointed out in the background technology.
The technical scheme adopted by the invention is as follows:
the utility model provides a frequency conversion air source hot water unit of two coil pipe water tanks, includes compressor, four-way reversing valve and vapour and liquid separator that consecutive, the D mouth of four-way reversing valve links to each other with the compressor, the S mouth links to each other with vapour and liquid separator, C mouth passes through in proper order behind second water tank pipeline, third electronic expansion valve and the finned heat exchanger and links to each other with the E mouth of four-way reversing valve, be equipped with first water tank pipeline between the D mouth front end of four-way reversing valve and the front end of third electronic expansion valve, be equipped with the by-pass pipeline between the front end of first water tank pipeline and the rear end of third electronic expansion valve, the by-pass pipeline on be equipped with bypass defrosting solenoid valve.
Preferably, the second water tank pipeline comprises a second electromagnetic valve, a second coil water tank side inlet stop valve, a second coil water tank side outlet stop valve and a second electronic expansion valve which are sequentially connected in sequence.
Preferably, the first water tank pipeline comprises a first electromagnetic valve, a first coil water tank side inlet stop valve, a first coil water tank side outlet stop valve and a first electronic expansion valve which are sequentially connected from front to back.
Preferably, the water inlet of the first coil water tank is connected with a water inlet pipe through a first water inlet electromagnetic water valve, the water outlet of the first coil water tank is connected with a water outlet pipe through a first water outlet electromagnetic water valve, the water inlet of the second coil water tank is connected with the water inlet pipe through a second water inlet electromagnetic water valve, the water outlet of the second coil water tank is connected with a water outlet pipe through a second water outlet electromagnetic water valve, the water outlet end of the water outlet pipe is provided with a cold and hot water mixing regulating valve, the cold water end of the cold and hot water mixing regulating valve is connected with the water inlet pipe through a cold water pipe, the hot water end is connected with the water outlet pipe, the water outlet end of the cold and hot water mixing regulating valve is connected with the water end, and the water inlet pipe is provided with a water pump.
Preferably, an exhaust temperature sensor, a high-pressure switch and a high-pressure sensor are arranged at the outlet end of the compressor, an air suction temperature sensor and a low-pressure switch are arranged at the inlet end of the gas-liquid separator, a fin outlet temperature sensor is arranged between the outlet end of the fin-type heat exchanger and an E port of the four-way reversing valve, a fin temperature sensor is arranged at the inlet end of the fin-type heat exchanger, a third electronic expansion valve inlet temperature sensor is arranged between the inlet end of a third electronic expansion valve and the first electronic expansion valve as well as between the inlet end of the third electronic expansion valve and the second electronic expansion valve, a third electronic expansion valve outlet temperature sensor is arranged at the outlet end of the third electronic expansion valve, a first coil water tank temperature sensor is arranged in the first coil water tank, and a second coil water tank temperature sensor is arranged in the second coil water tank.
A control method of a variable-frequency air source hot water unit with a double-coil water tank,
heating control:
1) when the temperature T detected by the temperature sensor of the first coil water tank1Satisfy T1≤TSet temperature-△TStarting temperatureWhen the unit is started, the first time is enteredThe water electromagnetic water valve, the first water outlet electromagnetic water valve, the second water inlet electromagnetic water valve and the second water outlet electromagnetic water valve are all closed, the first electromagnetic valve is opened, the second electromagnetic valve is closed, the second electronic expansion valve is closed to 0 step, the first electronic expansion valve and the third electronic expansion valve are opened, and a high-temperature and high-pressure refrigerant generated by the compressor enters the first coil water tank to be heated;
2) when the temperature T detected by the second coil water tank temperature sensor2Satisfy T2≤TSet temperature-△TStarting temperatureWhen the unit is started, the first water inlet electromagnetic water valve, the first water outlet electromagnetic water valve, the second water inlet electromagnetic water valve and the second water outlet electromagnetic water valve are all closed, the first electromagnetic valve is closed, the second electromagnetic valve is opened, the first electronic expansion valve is closed to 0 step, the second electronic expansion valve and the third electronic expansion valve are opened, and a high-temperature and high-pressure refrigerant generated by the compressor enters the second coil water tank to be heated;
3) when the temperature T detected by the temperature sensor of the first coil water tank 1Satisfy T1≤TSet temperature-△TStarting temperatureAnd the temperature T detected by the second coil water tank temperature sensor2Satisfy T2≤TSet temperature-△TStarting temperatureWhen the unit is started, the first water inlet electromagnetic water valve, the first water outlet electromagnetic water valve, the second water inlet electromagnetic water valve and the second water outlet electromagnetic water valve are all closed, the first electromagnetic valve, the second electromagnetic valve, the first electronic expansion valve, the second electronic expansion valve and the third electronic expansion valve are all opened, and high-temperature and high-pressure refrigerants generated by the compressor enter the first coil water tank and the second coil water tank to be heated;
4) when T is1≥TSet temperatureAnd/or T2≥TSet temperatureAnd when the unit stops heating the first coil water tank and/or the second coil water tank.
Defrosting control:
1) when only the first coil water tank is heated and the defrosting entry condition is met, the second electromagnetic valve of the second coil water tank is closed, the second electronic expansion valve is closed, the first water outlet electromagnetic water valve is closed, the first electromagnetic valve of the first coil water tank is opened, the first electronic expansion valve and the third electronic expansion valve operate the defrosting steps and the bypass defrosting electromagnetic valve is opened, the unit performs hot gas bypass defrosting, and when the tail end of water is used with hot water, the second water outlet electromagnetic water valve is opened to supply hot water;
2) When only the second coil water tank is heated and meets defrosting entry conditions, the first electromagnetic valve of the first coil water tank is closed, the first electronic expansion valve is closed, the second water outlet electromagnetic water valve is closed, the second electromagnetic valve of the second coil water tank is opened, the second electronic expansion valve and the third electronic expansion valve operate defrosting steps, the bypass defrosting electromagnetic valve is opened, the unit conducts hot gas bypass defrosting, meanwhile, the four-way reversing valve reverses to defrost, if the four-way reversing valve cannot normally reverse, and the temperature T detected by the third electronic expansion valve outlet temperature sensor in continuous T time is T3< temperature T detected by third electronic expansion valve inlet temperature sensor4(ii) a The second electromagnetic valve and the second electronic expansion valve are closed, and reversing defrosting is not carried out;
3) when the first coil water tank and the second coil water tank are heated and meet defrosting entry conditions, the first electromagnetic valve and the second electromagnetic valve are opened, the first water outlet electromagnetic water valve and the second water outlet electromagnetic water valve are closed, the first electronic expansion valve, the second electronic expansion valve and the third electronic expansion valve run for defrosting steps, the bypass defrosting electromagnetic valve is closed, the unit carries out reversing defrosting of the four-way reversing valve, if the four-way reversing valve cannot be normally reversed, and the temperature T detected by the temperature sensor at the outlet of the third electronic expansion valve within continuous T time is T 3< temperature T detected by third electronic expansion valve inlet temperature sensor4(ii) a The second electromagnetic valve and the second electronic expansion valve are closed, and reversing defrosting is not carried out.
According to the invention, two coil water tanks are adopted, when the first coil water tank and the second coil water tank are heated and defrosted, the first coil water tank can be heated, hot water supply is ensured by means of the first coil water tank, and hot water supply cannot be ensured by the single coil water tank during defrosting.
Drawings
Figure 1 illustrates a schematic diagram of the system of the present invention.
Detailed Description
The invention is described in further detail below by means of specific embodiments in conjunction with the accompanying drawings.
Example 1
As shown in fig. 1, a variable-frequency air source hot water unit with double coil pipes for water tanks comprises a compressor 1, a four-way reversing valve 5 and a gas-liquid separator 8 which are sequentially connected from front to back, wherein a port D of the four-way reversing valve 5 is connected with the compressor 1, a port S of the four-way reversing valve is connected with the gas-liquid separator 8, a port C of the four-way reversing valve is sequentially connected with a port E of the four-way reversing valve 5 after passing through a second water tank pipeline, a third electronic expansion valve 13 and a fin type heat exchanger 10, a first water tank pipeline is arranged between the front end of the port D of the four-way reversing valve 5 and the front end of the third electronic expansion valve 13, a bypass pipeline is arranged between the front end of the first water tank pipeline and the rear end of the third electronic expansion valve 13, and a bypass defrosting solenoid valve 15 is arranged on the bypass pipeline.
The second water tank pipeline comprises a second electromagnetic valve 21, a second coil water tank side inlet stop valve 22, a second coil water tank 25, a second coil water tank side outlet stop valve 28 and a second electronic expansion valve 29 which are sequentially connected from front to back.
The first tank pipeline comprises a first electromagnetic valve 16, a first coil tank side inlet stop valve 17, a first coil tank 18, a first coil tank side outlet stop valve 19 and a first electronic expansion valve 20 which are sequentially connected from front to back.
The water inlet of first coil pipe water tank 18 links to each other with an inlet tube through first electromagnetism water valve 26 that intakes, the delivery port of first coil pipe water tank 18 links to each other with an outlet pipe through first play water electromagnetism water valve 23, the water inlet of second coil pipe water tank 25 links to each other with the inlet tube through second electromagnetism water valve 27 that intakes, the delivery port of second coil pipe water tank 25 links to each other with the outlet pipe through second play water electromagnetism water valve 24, the play water end of outlet pipe is equipped with hot and cold water mixing control valve 30, the cold water end of hot and cold water mixing control valve 30 passes through the cold water pipe and links to each other with the inlet tube, and the hot water end links to each other with the outlet pipe, the play water end and the terminal 31 of water consumption of hot and cold water mixing control valve 30 link to each other, the inlet tube on be equipped with water pump 32.
The outlet end of compressor 1 is equipped with exhaust temperature sensor 2, high pressure switch 3 and high pressure sensor 5, the entrance point of vapour and liquid separator 8 is equipped with temperature sensor 6 and low pressure switch 7 of breathing in, be equipped with fin play temperature sensor 9 between the exit end of finned heat exchanger 10 and the E mouth of four-way reversing valve 5, the entrance point is equipped with fin temperature sensor 11, it enters temperature sensor 14 to be equipped with the third electronic expansion valve between the entrance point of third electronic expansion valve 13 and first electronic expansion valve 20, the second electronic expansion valve 29, the exit end is equipped with third electronic expansion valve and goes out temperature sensor 12, first coil water tank 18 in be equipped with first coil water tank temperature sensor 33, second coil water tank 25 in be equipped with second coil water tank temperature sensor 34.
A control method of a variable-frequency air source hot water unit with a double-coil water tank,
heating control:
1) when the temperature T detected by the first coil water tank temperature sensor 331Satisfy T1≤TSet temperature-△TStarting temperatureWhen the unit is started, the first water inlet electromagnetic water valve 26, the first water outlet electromagnetic water valve 23, the second water inlet electromagnetic water valve 27 and the second water outlet electromagnetic water valve 24 are all closed, the first electromagnetic valve 16 is opened, the second electromagnetic valve 21 is closed, the second electronic expansion valve 29 is closed to 0 step, the first electronic expansion valve 20 and the third electronic expansion valve 13 are opened, the third electronic expansion valve 13 is controlled according to the suction superheat degree, the first electronic expansion valve 20 is controlled according to the condensation temperature difference, and a high-temperature and high-pressure refrigerant generated by the compressor 1 enters the first coil water tank 18 to be heated;
2) When the temperature T detected by the second coil tank temperature sensor 342Satisfy T2≤TSet temperature-△TStarting temperatureWhen the unit is started, the first water inlet electromagnetic water valve 26, the first water outlet electromagnetic water valve 23, the second water inlet electromagnetic water valve 27 and the second water outlet electromagnetic water valve 24 are all closed, the first electromagnetic valve 16 is closed, the second electromagnetic valve 21 is opened, and the first electronic expansion valve 20 is openedWhen the step 0 is closed, the second electronic expansion valve 29 and the third electronic expansion valve 13 are opened, the third electronic expansion valve 13 is controlled according to the suction superheat degree, the second electronic expansion valve 29 is controlled according to the condensation temperature difference, and the high-temperature and high-pressure refrigerant generated by the compressor 1 enters the second coil water tank 25 for heating;
3) when the temperature T detected by the first coil water tank temperature sensor 331Satisfy T1≤TSet temperature-△TStarting temperatureAnd the temperature T detected by the second coil tank temperature sensor 342Satisfy T2≤TSet temperature-△TStarting temperatureWhen the unit is started, the first water inlet electromagnetic water valve 26, the first water outlet electromagnetic water valve 23, the second water inlet electromagnetic water valve 27 and the second water outlet electromagnetic water valve 24 are all closed, the first electromagnetic valve 16, the second electromagnetic valve 21, the first electronic expansion valve 20, the second electronic expansion valve 29 and the third electronic expansion valve 13 are all opened, the third electronic expansion valve 13 is controlled according to the suction superheat degree, the first electronic expansion valve 20 and the second electronic expansion valve 29 are controlled according to respective condensation temperature differences, and high-temperature and high-pressure refrigerants generated by the compressor 1 enter the first coil water tank 18 and the second coil water tank 25 to be heated;
4) When T is1≥TSet temperatureAnd/or T2≥TSet temperatureWhen the compressor is stopped, the unit stops heating the first coil water tank 18 and/or the second coil water tank 25, and the compressor 1 stops or adjusts the frequency correspondingly;
defrosting control:
1) when only the first coil water tank 18 is heated and the defrosting entry condition is met, the second electromagnetic valve 21 of the second coil water tank 25 is closed, the second electronic expansion valve 29 is closed, the first water outlet electromagnetic water valve 23 is closed, the first electromagnetic valve 16 of the first coil water tank 18 is opened, the first electronic expansion valve 20 and the third electronic expansion valve 13 operate the defrosting steps and the bypass defrosting electromagnetic valve 15 is opened, the unit performs hot gas bypass defrosting, so that the fluctuation of the water temperature of the first coil water tank 18 is not particularly large (almost no fluctuation), and when the water end 31 uses hot water, the second water outlet electromagnetic water valve 24 is opened, so that the hot water used by a user can be ensured while defrosting;
2) when only the second coil water tank 25 is heated and the defrosting entry condition is met, the first electromagnetic valve 16 of the first coil water tank 18 is closed, the first electronic expansion valve 20 is closed, the second water outlet electromagnetic water valve 24 is closed, the second electromagnetic valve 21 of the second coil water tank 25 is opened, the second electronic expansion valve 29 and the third electronic expansion valve 13 operate the defrosting steps and the bypass defrosting electromagnetic valve 15 is opened, the unit performs hot gas bypass defrosting, meanwhile, the four-way reversing valve 5 reverses to defrost, so that the water temperature of the first coil water tank 18 cannot fluctuate, although the temperature of the water in the second coil water tank 25 fluctuates, when the water end 31 is used with hot water, the first outlet solenoid water valve 23 is opened, therefore, when defrosting is carried out, normal hot water use can be guaranteed, if the four-way reversing valve 5 cannot be normally reversed, and the temperature T detected by the temperature sensor 12 of the third electronic expansion valve within T continuous time is guaranteed. 3< temperature T detected by third electronic expansion valve inlet temperature sensor 144(ii) a The second electromagnetic valve 21 and the second electronic expansion valve 29 are closed, and the reversing defrosting is not carried out;
3) and when both the first coil tank 18 and the second coil tank 25 are heated and meet the defrost entry condition, the first solenoid valve 16 and the second solenoid valve 21 are opened, the first water outlet solenoid water valve 23 and the second water outlet solenoid water valve 24 are closed, the first electronic expansion valve 20, the second electronic expansion valve 29 and the third electronic expansion valve 13 operate to defrost, the bypass defrosting solenoid valve 15 is closed, the unit performs reversing defrosting of the four-way reversing valve 5, because the refrigerant in the first coil water tank 18 is led out from the exhaust pipeline of the compressor 1, the first coil water tank 18 is always high-temperature and high-pressure refrigerant, the first coil water tank 18 can still be heated, therefore, the first coil water tank 18 can be heated while defrosting, and if the four-way reversing valve 5 cannot be normally reversed, the temperature T detected by the third electronic expansion valve outlet temperature sensor 12 is continuously T times.3< temperature T detected by third electronic expansion valve inlet temperature sensor 144(ii) a The second electromagnetic valve 21 and the second electronic expansion valve 29 are closed and reverse defrosting is not performed.
Finally, it should be noted that the above-mentioned list is only a specific embodiment of the present invention. It is apparent that the present invention is not limited to the above embodiment, and many modifications are possible. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the present invention are to be considered within the scope of the invention.
Claims (6)
1. The utility model provides a frequency conversion air source hot water unit of two coil pipe water tanks, its characterized in that, compressor (1), four-way reversing valve (5) and vapour and liquid separator (8) that link to each other in proper order around including, the D mouth of four-way reversing valve (5) links to each other with compressor (1), the S mouth links to each other with vapour and liquid separator (8), the C mouth passes through second water tank pipeline, third electronic expansion valve (13) and finned heat exchanger (10) back in proper order and links to each other with the E mouth of four-way reversing valve (5), be equipped with first water tank pipeline between the D mouth front end of four-way reversing valve (5) and the front end of third electronic expansion valve (13), be equipped with bypass pipeline between the front end of first water tank pipeline and the rear end of third electronic expansion valve (13), bypass pipeline on be equipped with bypass defrosting solenoid valve (15).
2. The variable-frequency air source hot water unit with the double-coil water tank is characterized in that the second water tank pipeline comprises a second electromagnetic valve (21), a second coil water tank side inlet stop valve (22), a second coil water tank (25), a second coil water tank side outlet stop valve (28) and a second electronic expansion valve (29) which are sequentially connected in sequence.
3. The variable-frequency air source hot water unit with double coil pipes and water tanks as claimed in claim 2, wherein the first water tank pipeline comprises a first electromagnetic valve (16), a first coil pipe water tank side inlet stop valve (17), a first coil pipe water tank (18), a first coil pipe water tank side outlet stop valve (19) and a first electronic expansion valve (20) which are sequentially connected in series.
4. The variable-frequency air source hot water unit with double coil water tanks as claimed in claim 3, characterized in that the water inlet of the first coil water tank (18) is connected with an inlet pipe through a first water inlet electromagnetic water valve (26), the water outlet of the first coil water tank (18) is connected with an outlet pipe through a first water outlet electromagnetic water valve (23), the water inlet of the second coil water tank (25) is connected with the inlet pipe through a second water inlet electromagnetic water valve (27), the water outlet of the second coil water tank (25) is connected with the outlet pipe through a second water outlet electromagnetic water valve (24), the water outlet of the outlet pipe is provided with a cold and hot water mixing regulating valve (30), the cold water end of the cold and hot water mixing regulating valve (30) is connected with the inlet pipe through a cold water pipe, the hot water end is connected with the outlet pipe, the water outlet end of the cold and hot water mixing regulating valve (30) is connected with the water end (31), the water inlet pipe is provided with a water pump (32).
5. The variable-frequency air source hot water unit with the double-coil water tank is characterized in that an exhaust temperature sensor (2), a high-pressure switch (3) and a high-pressure sensor (5) are arranged at the outlet end of the compressor (1), an air suction temperature sensor (6) and a low-pressure switch (7) are arranged at the inlet end of the gas-liquid separator (8), a fin outlet temperature sensor (9) is arranged between the outlet end of the fin-type heat exchanger (10) and the E port of the four-way reversing valve (5), a fin temperature sensor (11) is arranged at the inlet end, a third electronic expansion valve inlet temperature sensor (14) is arranged between the inlet end of the third electronic expansion valve (13) and the first electronic expansion valve (20) and the second electronic expansion valve (29), a third electronic expansion valve outlet temperature sensor (12) is arranged at the outlet end, and a first coil water tank temperature sensor (33) is arranged in the first coil water tank (18), and a second coil water tank temperature sensor (34) is arranged in the second coil water tank (25).
6. The control method of the variable-frequency air source hot water unit with the double-coil water tank is characterized by comprising the following steps of:
1) when the temperature T detected by the first coil water tank temperature sensor (33)1Satisfy T1≤TSet temperature-△TStarting temperature When the unit is started, the first water inlet electromagnetic water valve (26), the first water outlet electromagnetic water valve (23), the second water inlet electromagnetic water valve (27) and the second water outlet electromagnetic water valve (24) are all closed, the first electromagnetic valve (16) is opened, the second electromagnetic valve (21) is closed, the second electronic expansion valve (29) is closed to 0 step, and the first electronic expansion valve (29) is closedThe electronic expansion valve (20) and the third electronic expansion valve (13) are opened, and a high-temperature and high-pressure refrigerant generated by the compressor (1) enters the first coil water tank (18) to be heated;
2) when the temperature T detected by the second coil water tank temperature sensor (34)2Satisfy T2≤TSet temperature-△TStarting temperatureWhen the unit is started, the first water inlet electromagnetic water valve (26), the first water outlet electromagnetic water valve (23), the second water inlet electromagnetic water valve (27) and the second water outlet electromagnetic water valve (24) are all closed, the first electromagnetic valve (16) is closed, the second electromagnetic valve (21) is opened, the first electronic expansion valve (20) is closed to 0 step, the second electronic expansion valve (29) and the third electronic expansion valve (13) are opened, and high-temperature and high-pressure refrigerants generated by the compressor (1) enter the second coil water tank (25) to be heated;
3) when the temperature T detected by the first coil water tank temperature sensor (33)1Satisfy T1≤TSet temperature-△TStarting temperatureAnd the temperature T detected by the second coil tank temperature sensor (34) 2Satisfy T2≤TSet temperature-△TStarting temperatureWhen the unit is started, the first water inlet electromagnetic water valve (26), the first water outlet electromagnetic water valve (23), the second water inlet electromagnetic water valve (27) and the second water outlet electromagnetic water valve (24) are all closed, the first electromagnetic valve (16), the second electromagnetic valve (21), the first electronic expansion valve (20), the second electronic expansion valve (29) and the third electronic expansion valve (13) are all opened, and high-temperature and high-pressure refrigerants generated by the compressor (1) enter the first coil water tank (18) and the second coil water tank (25) to be heated;
4) when T is1≥TSet temperatureAnd/or T2≥TSet temperatureWhen the unit stops heating the first coil water tank (18) and/or the second coil water tank (25).
Defrosting control:
when only the first coil water tank (18) is heated and the defrosting entry condition is met, the second electromagnetic valve (21) of the second coil water tank (25) is closed, the second electronic expansion valve (29) is closed, the first water outlet electromagnetic water valve (23) is closed, the first electromagnetic valve (16) of the first coil water tank (18) is opened, the first electronic expansion valve (20) and the third electronic expansion valve (13) operate the defrosting steps and the bypass defrosting electromagnetic valve (15) is opened, and the unit performs hot gas bypass defrosting;
when only the second coil water tank (25) is heated and the defrosting entry condition is met, the first electromagnetic valve (16) of the first coil water tank (18) is closed, the first electronic expansion valve (20) is closed, the second water outlet electromagnetic water valve (24) is closed, the second electromagnetic valve (21) of the second coil water tank (25) is opened, the second electronic expansion valve (29) and the third electronic expansion valve (13) operate for defrosting steps and the bypass defrosting electromagnetic valve (15) is opened, the unit performs hot gas bypass defrosting, the four-way reversing valve (5) reverses for defrosting, if the four-way reversing valve (5) cannot normally reverse, and the temperature T detected by the third electronic expansion valve outlet temperature sensor (12) within continuous T time is T 3< temperature T detected by third electronic expansion valve inlet temperature sensor (14)4(ii) a The second electromagnetic valve (21) and the second electronic expansion valve (29) are closed, and reversing defrosting is not carried out;
when the first coil water tank (18) and the second coil water tank (25) are heated and meet defrosting entrance conditions, the first electromagnetic valve (16) and the second electromagnetic valve (21) are opened, the first water outlet electromagnetic water valve (23) and the second water outlet electromagnetic water valve (24) are closed, the first electronic expansion valve (20), the second electronic expansion valve (29) and the third electronic expansion valve (13) operate defrosting steps, the bypass defrosting electromagnetic valve (15) is closed, the unit carries out reversing defrosting of the four-way reversing valve (5), if the four-way reversing valve (5) cannot normally reverse, and the temperature T detected by the third electronic expansion valve outlet temperature sensor (12) in continuous T time is T3< temperature T detected by third electronic expansion valve inlet temperature sensor (14)4(ii) a The second electromagnetic valve (21) and the second electronic expansion valve (29) are closed, and reversing defrosting is not carried out.
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| CN202210288966.4A CN114754520A (en) | 2022-03-23 | 2022-03-23 | Variable-frequency air source hot water unit with double-coil water tank and control method thereof |
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| CN202210288966.4A CN114754520A (en) | 2022-03-23 | 2022-03-23 | Variable-frequency air source hot water unit with double-coil water tank and control method thereof |
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