CN101319818A - Frequency-variable flux-changing heat pump water heater - Google Patents
Frequency-variable flux-changing heat pump water heater Download PDFInfo
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- CN101319818A CN101319818A CNA2007100415669A CN200710041566A CN101319818A CN 101319818 A CN101319818 A CN 101319818A CN A2007100415669 A CNA2007100415669 A CN A2007100415669A CN 200710041566 A CN200710041566 A CN 200710041566A CN 101319818 A CN101319818 A CN 101319818A
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Abstract
The invention provides a frequency and flow changing heat pump water heater, relates to a liquid heater with a heat generation device by using a heat pump. The frequency and flow changing heat pump water heater comprises a unit part, a water circulating part, water tubes and communication lines connected inside the water circulating part. The unit part comprises a frequency-changing compressor, a cross tee change valve, a double pipe condenser, an unloading valve, an electronic expansion valve, an evaporator, a fan, a controller, various temperature sensors and pressure sensors. The water circulating part comprises a pump, an outlet valve, a ball valve, a water tank, a water temperature sensor and a filter. The frequency and flow changing heat pump water heater takes the frequency-changing compressor as the power source of the system, takes the electronic expansion valve as a throttling device and uses the water temperature sensor to prevent freezing. Compared with combustion gas, fuel oil, coal or electronic water heater, the frequency and flow changing heat pump water heater has safety, environmental protection and energy saving properties. Compared with the heat pump hot water units, the throttling of which uses rated frequency compressor and thermostatic expansion valve or capillary tubes, the frequency and flow changing heat pump water heater has high heating output power, good heating effect and good environmental adaptability.
Description
Technical field
The present invention relates to the liquid heater that utilizes heat pump of heat-generating device, be specially a kind of frequency-variable flux-changing heat pump water heater.
Background technology
Conventional water heaters is a heating energy source with combustion gas, fuel oil, fire coal or electricity usually, more new-type have adopt solar energy.The heat energy that combustion gas, fuel oil, coal burning water heater produce when utilizing the combustible burning adds hot water, it is insufficient both to have caused burning because of oxygen supply is not enough easily during burning, also cause the hot water fluctuating temperature easily because of hydraulic pressure is unstable, the danger that exists waste gas to poison and scald, therefore security and usability are relatively poor, and owing to must consume a large amount of non-renewable energy resources, use cost is higher, and is big to environmental pressure.Electric heater is lower to the utilization ratio of electric energy, consumes a large amount of electric energy, and operating cost is higher, and also exists imperfect earth and the electric leakage Danger Electric shock risk that causes.Therefore solar water heater generally adopts storage-type and auxiliary electrically heated design owing to must take the use of intensity of sunshine when not enough into account, and this characteristics make water temperature to fluctuate along with the intensity of sunshine size, and the auxiliary electrical heating exists the defective of electric heater too.
At present, a kind of air source hot pump water heater of novelty begins to occur on market, this is a kind of to absorb in the air heat energy as the equipment that is specifically designed to heat hot water of main energy sources, according to Carnot cycle principle design one cover circular work system, by flow process and the physics in the physical phase transition process and the variation of chemical heat of heating agent, the power by part electricity comes out the heat extraction in the ambient air, be converted into the medium energy of high temperature, and further water be heated to 55～65 ℃.The energy that this system's hot water obtains is more much bigger than the energy of power consumption, 3～3.5 times of average out to.Because the user generally is to need the hot water supply throughout the year when using, and the condensation side water temperature of heat pump often will be elevated to 55 ℃ from 5 ℃, this design and running to heat pump has brought great difficulty, and conventional Teat pump boiler is difficult to adapt to so wide environmental range.Existing heat-pump hot-water unit generally all is to adopt invariable frequency compressor and heating power expansion valve or capillary to carry out throttling, can only satisfy interior instructions for use, and when variations in temperature was big, the performance parameter of unit will reduce.For example, when summer, environment temperature was higher (temperature is generally more than 40 ℃), the delivery temperature of unit and pressure at expulsion are very high, cause protectiveness to shut down easily, make the unit can't operate as normal; When winter, environment temperature was low (temperature is generally below 0 ℃), the delivery temperature of unit is lower, and it is lower to heat power output, and heating effect is relatively poor.
Summary of the invention
For overcome conventional water heaters low, the poor reliability of intrinsic energy resource consumption high usage, dangerous big defective and existing heat-pump hot-water unit heat the defective that power output is low, heating effect is relatively poor, the invention discloses a kind of frequency-variable flux-changing heat pump water heater.
The technical solution used in the present invention is as follows: a kind of frequency-variable flux-changing heat pump water heater, form by unit part, water cyclic part and connection water pipe, connection wherein; Unit partly comprises: frequency conversion rate compressor, exhaust gas temperature sensor, back pressure transducer, four-way change-over valve, tube-in-tube condenser, leaving water temperature sensor, coil temperature sensor, unloader, electric expansion valve, evaporimeter, environment temperature sensor, blower fan, controller, back pressure sensor and suction temperature sensor; The water cyclic part comprises: water pump, air bleeding valve, ball valve, water tank, cooling-water temperature sensor and filter;
The signal output part end of evaporimeter is connected by the signal input part of connection with the back pressure sensor, and the air pressure probe of back pressure sensor all is connected with the return-air mouth of frequency conversion rate compressor with the temp probe of suction temperature sensor,
The temp probe of environment temperature sensor is connected with the surface of evaporimeter,
The temp probe of exhaust gas temperature sensor all is connected with the exhaust outlet of frequency conversion rate compressor with the air pressure of back pressure transducer probe, the signal output part of exhaust gas temperature sensor and back pressure transducer all is connected by the signal input part of connection and four-way change-over valve, the signal output part of four-way change-over valve is connected by the signal input part of connection and tube-in-tube condenser
The signal output part of unloader all is connected by the signal input part of connection and evaporimeter with the signal output part of electric expansion valve, the signal input part of unloader all is connected by the signal output part of connection and tube-in-tube condenser with the signal input part of electric expansion valve
The signal input part of the signal input part of frequency conversion rate compressor, the signal input part of four-way change-over valve, electric expansion valve all is connected by the signal output part of connection and controller, the signal output part of the signal output part of the signal output part of back pressure sensor, suction temperature sensor, the signal output part of exhaust gas temperature sensor, back pressure transducer all is connected by the signal input part of connection and controller with the signal output part of environment temperature sensor
The delivery port of tube-in-tube condenser is connected by the water inlet of water pipe and water pump, the temp probe of coil temperature sensor is connected with the surface of tube-in-tube condenser, the temp probe of leaving water temperature sensor is connected with near the water pipe of the delivery port of tube-in-tube condenser, the signal output part of coil temperature sensor all is connected by the signal input part of connection and controller with the signal output part of leaving water temperature sensor
The delivery port of water pump is connected by the air inlet of water pipe and air bleeding valve, the gas outlet of air bleeding valve is connected by the water inlet of water pipe and ball valve, the delivery port of ball valve is connected by the water inlet of water pipe and water tank, the delivery port of water tank is connected by the water inlet of water pipe and ball valve, the delivery port of ball valve is connected by the water inlet of water pipe and filter, the delivery port of filter is connected by the water inlet of water pipe and tube-in-tube condenser
Water to be heated is connected by the water inlet of water pipe and ball valve, the delivery port of ball valve is connected by the water inlet of water pipe and water tank, the delivery port of water tank is connected by the water inlet of water pipe and ball valve, and the delivery port of ball valve exports heated hot water to the user use side by water pipe.
The output of the existing control electric expansion valve of controller open angle, control compressor operation frequency output terminal is also arranged, and the signal output part of the signal output part of coil temperature sensor and suction temperature sensor all is connected by the output of connection with controller control electric expansion valve open angle; The signal output part of the signal output part of environment temperature sensor, the signal output part of exhaust gas temperature sensor and cooling-water temperature sensor all is connected by the output of connection with controller control compressor operation frequency.
Working method of the present invention is as follows:
Controller detects the numerical value of cooling-water temperature sensor, and the coolant-temperature gage numerical value of setting with the user compares, and when the coolant-temperature gage numerical value-6 of cooling-water temperature sensor numerical value≤setting ℃, controller sends CRANK PULSES, and unit powers up, entry into service.
The numerical value of controller testing environment temperature sensor is determined the initial operation frequency of frequency-changeable compressor and the initial opening angle of electric expansion valve according to the numerical value of environment temperature sensor.
In the unit operation process, constantly detect the numerical value of suction temperature sensor and the numerical value of coil temperature sensor, difference according to suction temperature sensor and coil temperature sensor, adjust the open angle of electric expansion valve, make electric expansion valve be in best throttle, the performance parameter of unit under this condition of work is superior.
In the unit operation process; numerical value, the numerical value of exhaust gas temperature sensor and the numerical value of cooling-water temperature sensor of continuous testing environment temperature sensor; according to the numerical value of environment temperature sensor, exhaust gas temperature sensor and the numerical value of cooling-water temperature sensor; adjust the operating frequency of compressor; make unit under this condition of work, compressor is in best running state, has both guaranteed the heating capacity of unit; guarantee that again unit can run well, protectiveness does not take place shut down.
According to the numerical value of leaving water temperature sensor, determine the water temperature in the water lines, the water temperature in the anti-antipriming pipe is crossed when hanging down, and the water in the water pipe is build-up ice, freezing unit.
Air source hot pump water heater is a kind of dynamical hot water facility, also is referred to as new solar water heater or indirect type solar water heater.This water heater has very outstanding energy-conserving and environment-protective performance, and stable work in work, is subjected to climatic effect less, be not subjected to the cloudy day rain, the influence of day and night.This water heater is a kind of to absorb in the air heat energy as the equipment that is specifically designed to heat hot water of main energy sources, according to Carnot cycle principle design one cover circular work system, flow process and the physics in the physical phase transition process and the variation of chemical heat by heating agent, power by part electricity, heat extraction in the ambient air is come out, be converted into the medium energy of high temperature, and further water be heated to 55～65 ℃.The energy that this system's hot water obtains is more much bigger than the energy of power consumption, 3～3.5 times of average out to.
In hot machine work system, compressor is a power source, and its effect is that heating agent is collapsed into high temperature and high pressure gas, (gas temperature can reach 80～100 ℃); The heat that high-performance heat exchanger can carry heating agent is converted into hot water, through this interchanger, heating agent loses physics heat energy and potential chemical heat energy, reduce to low temperature and be converted into liquid state by high temperature by gaseous state, the water of routed through heat exchanger meanwhile, obtain energy and the rising temperature becomes the hot water that use value is arranged; When heating agent through after choke valve enters heat dump, the pressure of heating agent self has reduced and has become (evaporation) gaseous state by liquid state, because of boiling point be lower than 0 ℃ a lot of.Make the temperature of heat dump be significantly less than environment temperature, a large amount of air is distributing around heat dump this moment, temperature when their temperature is higher than the heating agent evaporation, heating agent is very easily in the heat absorption evaporation, and losing the heat of self, air becomes colder air (also claiming cold air), when heating agent was finished the heat absorption evaporating course in heat dump after, air heat energy had replenished the calorific potential that heating agent loses in heat exchanger.
Compare as the water heater of heating energy source with using combustion gas, fuel oil, fire coal or electricity, the present invention has following advantage:
1. security:
The process of heating of the present invention is by the high-temperature high-pressure refrigerant gas that compressor is discharged water to be heated, electricity is mainly used in the normal operation of keeping compressor, gas after the heating carries out heat exchange with water in tube-in-tube condenser, complete electricity separation, like this, neither there is electric leakage hidden danger, also avoided electric heating tube surface temperature height to cause scale effect electrical heating effect easily.
2. the feature of environmental protection:
The present invention directly absorbs heat water is heated from air, do not have the discharging of any waste water,waste gas and industrial residue, adopts environment friendly refrigerating fluid as the work refrigerant simultaneously, has really embodied the feature of environmental protection of product.
3. energy saving:
The present invention only need provide a spot of electric energy, keeps the normal operation of compressor, absorbs heat from air water is heated, its heating efficiency is generally more than 3.0, promptly consume 1 degree electricity, can produce electrical heating and consume the hot water that 3 degree electricity are produced, greatly saved the energy.
Carry out the heat-pump hot-water unit of throttling with existing employing invariable frequency compressor and heating power expansion valve or capillary and compare, the present invention has following advantage:
1. select the power source of frequency-changeable compressor for use as system.Invariable frequency compressor is because its operating frequency is a definite value, the power output that is compressor is constant, when variation of ambient temperature is big, the heating capacity of heat-pump hot-water unit also can change a lot, when environment temperature is higher (〉=40 ℃), the heating capacity of unit is about 1.5 times under the declared working condition; When environment temperature is low (≤5 ℃), the heating capacity of unit is about 0.5 times under the declared working condition.Therefore; when the environment temperature temperature is higher; though the heating capacity of unit has improved; but the pressure at expulsion of system and delivery temperature also can be very high; be easy to cause the system protection shutdown (delivery temperature and pressure at expulsion exceed the ability to bear of unit because excessive discharge temperature or pressure at expulsion are too high; unusual for preventing that machine set system from occurring, must take protectiveness to shut down).Simultaneously, because after the continuous heating of water temperature quilt, water temperature also can constantly raise (reaching as high as 65 ℃), this moment, the delivery temperature and the pressure at expulsion of unit were higher because evaporating temperature and condensation temperature all are in higher state.When environment temperature is low, because absorbing heat from air, the air-source heat pump hot water group carries out the water heating, so environment temperature is low more, the heat that unit absorbs from air is few more, the heating capacity of unit is poor more.After adopting frequency-changeable compressor,, regulate the operating frequency of compressor automatically, promptly regulate the power output of unit according to environment temperature and water temperature.When environment temperature was higher, for delivery temperature and the pressure at expulsion that guarantees unit is in rational numerical, the operating frequency according to delivery temperature numerical value and cooling-water temperature sensor numerical value decision compressor when delivery temperature is higher, reduced the operating frequency of compressor; When delivery temperature is low, improve the operating frequency of compressor.When cooling-water temperature sensor numerical value is low, improve the operating frequency of compressor; When cooling-water temperature sensor numerical value is higher, reduce the operating frequency of compressor.Simultaneously, increased unloader in system of the present invention, when pressure at expulsion is too high, run well for guaranteeing unit, unloader is opened, and carries out off-load, reduces the pressure at expulsion of system.
2. select for use electric expansion valve as throttling arrangement.Traditional heat pump generally selects for use capillary or heating power expansion valve to carry out throttling as throttling arrangement.Capillary is a kind of throttling arrangement of constant flow, its flow is constant relatively, when the operating condition of system changes, its restriction effect but can correspondingly not change, and the operating condition of air-source heat pump hot water group is along with the variation of environment temperature, the very big change of difference can take place, and (environment temperature is from-10 ℃～45 ℃, water temperature is from 5 ℃～65 ℃), so select for use capillary as throttling arrangement, can only satisfy under a kind of operating mode, unit is in best running state, and when turning round under other working conditions, very big deviation will take place the fan-out capability of unit.Heating power expansion valve belongs to a kind of mechanical throttling arrangement, it is the suction temperature according to system, regulate the open angle of heating power expansion valve, to change the restriction effect of heating power expansion valve, but because the restriction of its version, and the control parameter is more single, only be suitable for the very little heat pump of working conditions change scope, and the working conditions change scope of air-source heat pump hot water group is bigger, so when selecting for use heating power expansion valve to carry out throttling, can only satisfy in one section operating mode scope, unit can be in optimum Working, when being in bad working environments condition following time, heating power expansion valve just can not satisfy the needs of unit running.Electric expansion valve has that adjustable range is wide, the control parameter changes and to wait advantage greatly, and along with the change of various parameters, opening step number and also corresponding change can taking place of electric expansion valve is that unit is in best running state with this understanding.Among the present invention,, regulate the open angle of electric expansion valve, the suction temperature sensor of unit and the difference of coil temperature sensor are maintained about 1 ℃ according to the numerical value of suction temperature sensor and the numerical value of coil temperature sensor.
3. when winter, environment temperature was low (below 0 ℃), if unit is in holding state (not heating running) for a long time, hot water in the unit internal water system pipeline will slowly cool off, when the hot water in the water system pipeline is cooled to below 0 ℃, the water system pipeline will freeze, and unit is freezing.Adopted leaving water temperature sensor anti-freeze defencive function among the present invention; when unit is in holding state; if the numerical value of leaving water temperature sensor is lower than 10 ℃; controller will send signal; require water pump to turn round, the hot water in the water tank is evacuated in the water system pipeline of unit inside, when the numerical value of leaving water temperature sensor is higher than 20 ℃; water pump will shut down, and freezes so can well prevent water lines.
Description of drawings
Fig. 1 is a structure chart of the present invention
The specific embodiment
As shown in Figure 1, a kind of frequency-variable flux-changing heat pump water heater is made up of unit part 100, water cyclic part 200 and connection water pipe, connection wherein; Unit partly comprises: frequency conversion rate compressor 1, exhaust gas temperature sensor 2, back pressure transducer 3, four-way change-over valve 4, tube-in-tube condenser 5, leaving water temperature sensor 6, coil temperature sensor 7, unloader 8, electric expansion valve 9, evaporimeter 10, environment temperature sensor 11, blower fan 12, controller 13, back pressure sensor 14 and suction temperature sensor 15; The water cyclic part comprises: water pump 16, air bleeding valve 17, ball valve 181,182,183 and 184, water tank 19, cooling-water temperature sensor 20 and filter 21;
The signal output part end of evaporimeter 10 is connected by the signal input part of connection with back pressure sensor 14, and the air pressure probe of back pressure sensor 14 all is connected with the return-air mouth of frequency conversion rate compressor 1 with the temp probe of suction temperature sensor 15,
The temp probe of environment temperature sensor 11 is connected with the surface of evaporimeter 10,
The air pressure probe of the temp probe of exhaust gas temperature sensor 2 and back pressure transducer 3 all is connected with the exhaust outlet of frequency conversion rate compressor 1, the signal output part of exhaust gas temperature sensor 2 and back pressure transducer 3 all is connected by the signal input part of connection with four-way change-over valve 4, the signal output part of four-way change-over valve 4 is connected by the signal input part of connection with tube-in-tube condenser 5
The signal output part of unloader 8 all is connected by the signal input part of connection with evaporimeter 10 with the signal output part of electric expansion valve 9, the signal input part of unloader 8 all is connected by the signal output part of connection with tube-in-tube condenser 5 with the signal input part of electric expansion valve 9
The signal input part of the signal input part of frequency conversion rate compressor 1, the signal input part of four-way change-over valve 4, electric expansion valve 9 all is connected by the signal output part of connection with controller 13, the signal output part of the signal output part of the signal output part of the signal output part of back pressure sensor 14, suction temperature sensor 15, exhaust gas temperature sensor 2, back pressure transducer 3 all is connected by the signal input part of connection with controller 13 with the signal output part of environment temperature sensor 11
The delivery port of tube-in-tube condenser 5 is connected by the water inlet of water pipe with water pump 16, the temp probe of coil temperature sensor 7 is connected with the surface of tube-in-tube condenser 5, near the delivery port of the temp probe of leaving water temperature sensor 6 and tube-in-tube condenser 5 water pipe is connected, the signal output part of coil temperature sensor 7 all is connected by the signal input part of connection with controller 13 with the signal output part of leaving water temperature sensor 6
The delivery port of water pump 16 is connected by the air inlet of water pipe with air bleeding valve 17, the gas outlet of air bleeding valve 17 is connected by the water inlet of water pipe with ball valve 181, the delivery port of ball valve 181 is connected by the water inlet of water pipe with water tank 19, the delivery port of water tank 19 is connected by the water inlet of water pipe with ball valve 183, the delivery port of ball valve 183 is connected by the water inlet of water pipe with filter 21, the delivery port of filter 21 is connected by the water inlet of water pipe with tube-in-tube condenser 5
Water to be heated is connected by the water inlet of water pipe with ball valve 182, the delivery port of ball valve 182 is connected by the water inlet of water pipe with water tank 19, the delivery port of water tank 19 is connected by the water inlet of water pipe with ball valve 184, and the delivery port of ball valve 184 exports heated hot water to the user use side by water pipe.
The output of the existing control electric expansion valve of controller open angle, control compressor operation frequency output terminal is also arranged, and the signal output part of the signal output part of coil temperature sensor and suction temperature sensor all is connected by the output of connection with controller control electric expansion valve open angle; The signal output part of the signal output part of environment temperature sensor, the signal output part of exhaust gas temperature sensor and cooling-water temperature sensor all is connected by the output of connection with controller control compressor operation frequency.
Select the 3HP frequency-changeable compressor among the present invention program for use, under declared working condition, the operating frequency of compressor is 60Hz, the transport maximum frequency of compressor is 110Hz, minimum operating frequency is 20Hz, and when environment temperature, delivery temperature and water temperature were higher, the compressor operation frequency descended; When environment temperature, delivery temperature and water temperature are low, the compressor operation frequency rises, though the thermal energy that this moment, the air source provided reduces, the fan-out capability of compressor rises, so its heating effect still maintains higher level (for about 0.9 under the declared working condition).
After adopting this invention scheme, the heating effect of air-source heat pump hot water group is better, and is faster, and the coefficient of performance is higher, and energy-saving effect is more obvious.Under the declared working condition, the heating efficiency of unit can reach more than 4.5, and the heating efficiency of traditional air-source heat pump hot water group is generally about 3.5.Simultaneously, the low-temperature heating better effects if, when environment temperature is lower than 0 ℃, heating effect be under the declared working condition heating effect about 90%, and traditional air-source heat pump hot water group is when environment temperature is lower than 0 ℃, heating effect be under the declared working condition heating effect about 50%.
Claims (1)
1. a frequency-variable flux-changing heat pump water heater is made up of unit part (100), water cyclic part (200) and connection water pipe, connection wherein; Unit partly comprises: frequency conversion rate compressor (1), exhaust gas temperature sensor (2), back pressure transducer (3), four-way change-over valve (4), tube-in-tube condenser (5), leaving water temperature sensor (6), coil temperature sensor (7), unloader (8), electric expansion valve (9), evaporimeter (10), environment temperature sensor (11), blower fan (12), controller (13), back pressure sensor (14) and suction temperature sensor (15); The water cyclic part comprises: water pump (16), air bleeding valve (17), ball valve (181,182,183 and 184), water tank (19), cooling-water temperature sensor (20) and filter (21);
The signal output part end of evaporimeter (10) is connected by the signal input part of connection with back pressure sensor (14), the air pressure probe of back pressure sensor (14) all is connected with the return-air mouth of frequency conversion rate compressor (1) with the temp probe of suction temperature sensor (15)
The temp probe of environment temperature sensor (11) is connected with the surface of evaporimeter (10),
The air pressure probe of the temp probe of exhaust gas temperature sensor (2) and back pressure transducer (3) all is connected with the exhaust outlet of frequency conversion rate compressor (1), the signal output part of exhaust gas temperature sensor (2) and back pressure transducer (3) all is connected by the signal input part of connection with four-way change-over valve (4), the signal output part of four-way change-over valve (4) is connected by the signal input part of connection with tube-in-tube condenser (5)
The signal output part of unloader (8) all is connected by the signal input part of connection with evaporimeter (10) with the signal output part of electric expansion valve (9), the signal input part of unloader (8) all is connected by the signal output part of connection with tube-in-tube condenser (5) with the signal input part of electric expansion valve (9)
The signal input part of frequency conversion rate compressor (1), the signal input part of four-way change-over valve (4), the signal input part of electric expansion valve (9) all is connected by the signal output part of connection with controller (13), the signal output part of back pressure sensor (14), the signal output part of suction temperature sensor (15), the signal output part of exhaust gas temperature sensor (2), the signal output part of back pressure transducer (3) all is connected by the signal input part of connection with controller (13) with the signal output part of environment temperature sensor (11)
The delivery port of tube-in-tube condenser (5) is connected by the water inlet of water pipe with water pump (16), the temp probe of coil temperature sensor (7) is connected with the surface of tube-in-tube condenser (5), near the delivery port of the temp probe of leaving water temperature sensor (6) and tube-in-tube condenser (5) water pipe is connected, the signal output part of coil temperature sensor (7) all is connected by the signal input part of connection with controller (13) with the signal output part of leaving water temperature sensor (6), the delivery port of water pump (16) is connected by the air inlet of water pipe with air bleeding valve (17), the gas outlet of air bleeding valve (17) is connected by the water inlet of water pipe with ball valve (181), the delivery port of ball valve (181) is connected by the water inlet of water pipe with water tank (19), the delivery port of water tank (19) is connected by the water inlet of water pipe with ball valve (183), the delivery port of ball valve (183) is connected by the water inlet of water pipe with filter (21), the delivery port of filter (21) is connected by the water inlet of water pipe with tube-in-tube condenser (5)
Water to be heated is connected by the water inlet of water pipe with ball valve (182), the delivery port of ball valve (182) is connected by the water inlet of water pipe with water tank (19), the delivery port of water tank (19) is connected by the water inlet of water pipe with ball valve (184), and the delivery port of ball valve (184) exports heated hot water to the user use side by water pipe.
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| CNA2007100415669A CN101319818A (en) | 2007-06-04 | 2007-06-04 | Frequency-variable flux-changing heat pump water heater |
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2007
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