CN109059280A

CN109059280A - A kind of heat pump hot-water system and its control method

Info

Publication number: CN109059280A
Application number: CN201810763510.2A
Authority: CN
Inventors: 李干春; 冯勇强; 罗金星; 高翔; 王俊
Original assignee: Guangdong PHNIX Eco Energy Solution Ltd
Current assignee: Guangdong PHNIX Eco Energy Solution Ltd
Priority date: 2018-07-11
Filing date: 2018-07-11
Publication date: 2018-12-21
Anticipated expiration: 2038-07-11
Also published as: CN109059280B

Abstract

The invention discloses a kind of heat pump hot-water system and its control method, system includes controller, heat pump unit, water storage box and water supply pipe；First water outlet of water storage box is connected to the water inlet end of heat pump unit and is formed the first pipeline, and water storage box is connected to the water outlet of heat pump unit and forms the second pipeline；Water storage box, the first pipeline, heat pump unit and the second pipeline are sequentially connected and constitute circulating heating circuit, and water supply pipe, the first pipeline, heat pump unit, water storage box are sequentially connected and constitute directly-heated heating circuit；Water supply pipe is equipped with water supply pump, the first electromagnetism two-port valve, flow sensor and the second electromagnetism two-port valve being sequentially connected in series, and the first pipeline is equipped with the water circulating pump being electrically connected with the controller.The embodiment of the present invention can effectively realize circulating, directly-heated type heating mode the integration of heat pump water-heating machine, improve the hot water deliverability of heat pump water-heating machine, to be conducive to improve the usage comfort of user.

Description

A kind of heat pump hot-water system and its control method

Technical field

The present invention relates to Teat pump boiler technical fields, more particularly, to a kind of heat pump hot-water system and its control method.

Background technique

Currently, heat pump water-heating machine is promoted the thermal energy in air to high-order thermal energy using heat pump principle, it is used to prepare heat Water has the advantages that energy conservation and environmental protection, is gradually widely used.According to the heat-supplying mode of heat pump water-heating machine, it is divided into circulation hot Water dispenser and directly-heated type hot water machine.

Circulation hot water dispenser enters heat pump unit and is heated by constantly extracting the cold water of water storage box bottom, through heat pump plus Hot water after heat is entered at the top of water storage box by outlet pipeline, and user is made by extracting hot water from cistern interior with water end (W.E.) With；And directly-heated type hot water machine directly passes through the water that heat pump unit directly heats tap water supply system, hot water is stored in water storage box It is interior, with for users to use.

But due to the circulating-heating mode of circulation hot water dispenser, the higher water of temperature after heat pump unit heats exists Into after water storage box, can be mixed with the lower water of the temperature of water storage box bottom, so as to cause the water temperature drop of cistern interior, out The slow problem of existing heating speed, and then affect the usage comfort of user.And directly-heated type hot water machine hot water demand amount it is big when, It will appear the phenomenon of hot water insufficient supply, be not able to satisfy the demand of user's water use peak phase big flow water, also influence whether to use The comfort level at family.

Summary of the invention

The embodiment of the invention provides a kind of heat pump hot-water system and its control methods, to solve existing circulating hot water Machine heating speed is slow and directly-heated type hot water machine occurs the technical problem of hot water insufficient supply when hot water demand measures larger, thus Circulating, directly-heated type heating mode the integration for effectively realizing heat pump water-heating machine improves the hot water supply of heat pump water-heating machine Ability, and then be conducive to improve the usage comfort of user.

In order to solve the above-mentioned technical problem, the embodiment of the invention provides a kind of heat pump hot-water systems, including controller, heat Pump assembly, water storage box and water supply pipe；First water outlet of the water storage box is connected to simultaneously with the water inlet end of the heat pump unit The first pipeline is formed, the water inlet end of the water storage box is connected to the water outlet of the heat pump unit and is formed the second pipeline, described The water outlet of water supply pipe is connected on first pipeline；

The water storage box, first pipeline, the heat pump unit and second pipeline are sequentially connected and constitute circulation Formula heating circuit, the water supply pipe, first pipeline, the heat pump unit, the water storage box are sequentially connected and constitute straight Hot heating circuit；

The water supply pipe is equipped with the water supply pump for being sequentially connected in series and being electrically connected respectively with the controller, first Electromagnetism two-port valve, flow sensor and the second electromagnetism two-port valve, first pipeline are equipped with and are electrically connected with the controller Water circulating pump；The water level switch and the first temperature sensor being electrically connected respectively with the controller are equipped in the water storage box.

Preferably, the heat pump unit includes the compressor being electrically connected respectively with the controller, four-way valve, changes Hot device, blower and the first electric expansion valve；

The exhaust outlet of the compressor is connected to the port D of the four-way valve, the C port of the four-way valve and the heat exchange The first port of device is connected to, and the second port of the heat exchanger is connected to the first end of first electric expansion valve, and described the The second port of one electric expansion valve is connected to the first port of finned heat exchanger locating for the blower, locating for the blower The second port of finned heat exchanger is connected to the port E of the four-way valve, the port S of the four-way valve and returning for the compressor Port connection；

Wherein, the water inlet of the heat exchanger is connected to the water inlet end of the heat pump unit, the water outlet of the heat exchanger It is connected to the water outlet of the heat pump unit.

Preferably, the heat pump hot-water system further includes using water end (W.E.), constant voltage water pump and third electromagnetism two-port valve, Second water outlet of the water storage box by constant voltage water pump distribution with it is described with water end (W.E.), the third electromagnetism two-port valve the One end connection, the second end of the third electromagnetism two-port valve are connected to the water supply pipe；

The water storage box, the third electromagnetism two-port valve, the water supply pipe, first pipeline, the heat pump unit And second pipeline is sequentially connected and constitutes Recovery of the hot water circuit.

In order to solve identical technical problem, the embodiment of the invention also provides a kind of controlling parties of heat pump hot-water system Method, suitable for such as above-mentioned heat pump hot-water system, comprising the following steps:

In heat pump hot-water system operation, the heat pump unit is remained into open state；

In the operation of circulating heating mode, opens the water circulating pump of first pipeline and keep the water supply pipe Valve is open state, and the present flow rate of water supply pipe described in real-time detection；

When the present flow rate for detecting the water supply pipe is greater than preset minimum discharge, the water circulating pump is closed, To switch to directly-heated type heating mode；

In the operation of directly-heated type heating mode, the valve of the water supply pipe is opened, and close the water circulating pump；

When the water level switch for detecting the water storage box is closed, the water circulating pump is opened, the water supply pipe is closed Valve or reduce the valve opening of the water supply pipe, to switch to circulating heating mode.

Preferably, the heat pump unit is remained into unlatching in heat pump hot-water system operation described After the step of state, the method also includes:

When detecting that the water level switch disconnects, determine the water storage box for low water level state；

When current hot water temperature's value is less than preset first object temperature value, switches to and follow under low water level state Ring type heating mode；

When current hot water temperature's value is greater than preset first object temperature value, switched under low water level state straight Hot type heating mode；

In the operation of directly-heated type heating mode and water storage box holding low water level state, directly-heated type heating mode is calculated Runing time；

When the runing time of directly-heated type heating mode is greater than preset first directly-heated runing time, the water storage box is judged Current hot water temperature's value whether be less than preset second target temperature value, if so, switching to circulation under low water level state Formula heating mode；

When detecting water level switch closure, determine the water storage box for high water level state；

When current hot water temperature's value is less than preset third target temperature value, switches to and follow under high water level state Ring type heating mode；Wherein, the preset third target temperature value be the preset first object temperature value with it is preset Constant temperature shuts down the sum of return difference value.

Preferably, the method also includes:

When running the circulating heating mode under low water level state, judge the water storage box current hot water temperature whether Less than preset 4th target temperature value；Wherein, preset 4th target temperature value is the preset first object temperature The difference of angle value and directly-heated pattern switching return difference value；

If so, starting the compressor of the heat pump unit, and in the preset first starting for starting the compressor Between before, start the water circulating pump, and before starting the preset second starting time of the compressor, described in starting The blower of heat pump unit；

When running the circulating heating mode under high water level state, judge whether the heat pump hot-water system meets constant temperature Halt condition, if it is not, then starting the compressor of the heat pump unit, and in the preset first starting for starting the compressor Between before, start the water circulating pump, and before starting the preset second starting time of the compressor, described in starting The blower of heat pump unit.

Preferably, the method also includes:

In the operation of directly-heated type heating mode, when detecting water level switch closure, determine the water storage box for height Water position status；Or, determining the water storage box for high water level state when detecting water level switch closure；Control Heat Pump Water system switches to circulating heating mode from directly-heated type heating mode；

Keeping the compressor of the heat pump unit, blower is operating status, starts the water circulating pump；

After starting the water circulating pump, the state of the water flow switch on second pipeline is detected；

When detecting water flow switch closure, then in the preset third starting after water circulating pump starting Between after, close the valve of the water supply pipe；

When detecting that the water flow switch disconnects, start the turn-off time for calculating the water flow switch；

When the turn-off time of the water flow switch being equal to preset first report Downtime, then reported by report barrier equipment Barrier.

Preferably, the method also includes:

In the heat pump hot-water system startup, when the present flow rate for detecting the water supply pipe is greater than preset minimum When flow, start directly-heated type heating mode；

When running directly-heated type heating mode, start the compressor of the heat pump unit, and starting the compressor Before the preset first starting time, starts the blower of the heat pump unit and open the valve of the water supply pipe；

After the runing time for determining directly-heated type heating mode is greater than the first directly-heated runing time, the water storage box is judged Current hot water temperature whether be less than preset 4th target temperature value, if so, will be straight according to the disconnection of the water level switch Hot type heating mode switches to the circulating heating mode under low water level state；Or according to the closure of the water level switch by directly-heated Formula heating mode switches to the circulating heating mode under high water level state.

Preferably, the method also includes:

When detect the water level switch closure when, determine the water storage box for high water level state, the Heat Pump water system The heating mode of system is the circulating heating mode under high water level state；

When detecting that the heat pump unit is in the state of constant temperature shutdown, the compressor of the heat pump unit is opened, and Before the preset third starting time of the compressor start of the heat pump unit, blower and the institute of the heat pump unit are opened State the valve of water supply pipe；

When the present flow rate for detecting the water supply pipe is greater than preset minimum discharge, the water circulating pump is closed, The circulating heating mode under high water level state is switched to directly-heated type heating mode；

When detect the water level switch disconnect when, determine the water storage box for low water level state, the Heat Pump water system The heating mode of system is the circulating heating mode under low water level state；

The compressor, blower, the water circulating pump for keeping the heat pump unit are operating status, open the water supply pipe Valve；

When the present flow rate for detecting the water supply pipe is greater than preset minimum discharge, the water supply pipe is being closed Valve the second shut-in time after, close the water circulating pump, the circulating heating mode under low water level state cut Shift to directly-heated type heating mode.

Preferably, the method also includes:

When detecting that the heat pump unit is in the state of constant temperature shutdown, the compressor of the heat pump unit is opened, and Before the preset third starting time of the compressor start of the heat pump unit, blower and the institute of the heat pump unit are opened The valve for stating water supply pipe closes the water circulating pump, and the circulating heating mode under high water level state is switched to directly-heated Formula heating mode；

When detect the heat pump unit be in non-constant temperature shutdown state when, keep the heat pump unit compressor, Blower is operating status, and opens the valve of the water supply pipe；

When the present flow rate for detecting the water supply pipe is greater than preset minimum discharge, the water supply pipe is being closed Valve the first shut-in time after, close the water circulating pump, the circulating heating mode under high water level state cut Shift to directly-heated type heating mode.

Compared with the prior art, the embodiment of the present invention has the following beneficial effects:

In the present embodiment, real by the circulating heating circuit of the heat pump hot-water system and directly-heated type heating circuit Show heat pump hot-water system circulation-integrated heating function of directly-heated, to achieve the purpose that mutual supplement with each other's advantages, and then improves heat pump The hot water deliverability of hot water machine is conducive to the usage comfort for improving user.

The water inlet end connection of the water supply pipe is external for system, and the water supply pipe is entire by the water supply pump The heat pump hot-water system provides water source, passes through first by the water that the water supply pipe enters the heat pump hot-water system described First pipeline is flowed into the heat pump unit and is heated, to obtain the higher water of temperature, and then the higher water of temperature is logical It crosses second pipeline and is flowed into the water storage box and stored, with for users to use.

Wherein, when circulating heating mode is run, the water storage box, first pipeline, the heat pump unit and institute It states the second pipeline and is sequentially connected and constitutes circulating heating circuit, the lower water of water storage box bottom temp passes through described first Pipeline flows back into the heat pump unit and is reheated, and becomes the higher water of temperature and flows into from the water inlet of the water storage box In the water storage box, to effectively keep the stability of the water temperature of the cistern interior, water temperature is used with meet user Degree demand.

In the operation of directly-heated type heating mode, the lower water of temperature passes sequentially through the water supply water of the water supply pipe Pump, the first electromagnetism two-port valve, the flow sensor and the second electromagnetism two-port valve enter the heat-pump hot-water It in system, and enters in the heat pump unit and is heated by first pipeline, temperature is higher in the heat pump unit Water flowed into the water storage box by second pipeline, without carrying out abundant heating operation, hot water can be effectively prevented from Occurs insufficient phenomenon when demand is larger.

The controller is greater than by the flow sensor in the present flow rate for detecting the water supply pipe preset When minimum discharge, circulating heating mode is switched into directly-heated type heating mode；The controller detects the water level switch When closure, then directly-heated type heating mode is switched into circulating heating mode；And during pattern switching, without being opened Resetting is closed, it is unstable poor with users'comfort to efficiently solve the problems, such as that heat pump unit frequently stops machine bring water temperature.

In this way, the present embodiment can be realized circulating-heating and directly heat the unification of function, it both can guarantee that user uses water The requirement of temperature, and it is able to satisfy the demand of user's water consumption, in circulating heating mode or directly-heated type heating mode, cold water is all Hot water storage tank supply user's use is entered back into after needing to first pass through the heat pump unit heating, realizes quick comfortable water heating, To be conducive to improve user's comforts of use.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of the heat pump hot-water system of the embodiment of the present invention one；

Fig. 2 is the schematic diagram of the circulating heating mode of the heat pump hot-water system of the embodiment of the present invention one；

Fig. 3 is the schematic diagram of the directly-heated type heating mode of the heat pump hot-water system of the embodiment of the present invention one；

Fig. 4 is the schematic diagram in the Recovery of the hot water circuit of the heat pump hot-water system of the embodiment of the present invention one；

Fig. 5 is the flow diagram of the control method of the heat pump hot-water system of the embodiment of the present invention one；

Fig. 6 is the pattern switching schematic diagram of the control method of the heat pump hot-water system of the embodiment of the present invention one；

Fig. 7 is the operation schematic diagram of the circulating heating mode under the low water level state of the embodiment of the present invention one；

Fig. 8 is the operation schematic diagram of the directly-heated type heating mode of the embodiment of the present invention one；

Fig. 9 is the operation schematic diagram of the circulating heating mode under the high water level state of the embodiment of the present invention one；

Figure 10 is the circulating heated mould that the directly-heated type heating mode of the embodiment of the present invention one switches under low water level state The operation schematic diagram of formula；

Figure 11 is the circulating heated mould that the directly-heated type heating mode of the embodiment of the present invention one switches under high water level state The operation schematic diagram of formula；

Figure 12 is that the circulating heating mode under the low water level state of the embodiment of the present invention one switches to directly-heated type heated mould The operation schematic diagram of formula；

Figure 13 is that the circulating heating mode under the high water level state of the embodiment of the present invention one switches to directly-heated type heated mould The operation schematic diagram of formula；

Figure 14 is that the directly-heated type heating mode of the embodiment of the present invention one switches to the operation schematic diagram of water mixing and heating mode；

Wherein, the appended drawing reference of Figure of description is as follows:

1, heat pump unit；11, water storage box；12, water circulating pump；13, water supply pump；14, constant voltage water pump；15, water flow switch；

2, flow sensor；21, water level switch；22, the first temperature sensor；23, second temperature sensor；

3, the first electromagnetism two-port valve；31, the second electromagnetism two-port valve；32, the first check valve；33, second one-way valve；34, Three check valves；35, third electromagnetism two-port valve；

4, water end (W.E.) is used；

5, heat exchanger；51, blower；52, compressor；53, the first electric expansion valve；54, four-way valve；

A indicates circulating heating circuit；B indicates directly-heated type heating circuit；C indicates Recovery of the hot water circuit.

Specific embodiment

Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention.

Referring to Figure 1, the preferred embodiment of the present invention provides a kind of heat pump hot-water system, including controller, heat pump unit 1, water storage box 11 and water supply pipe；

Wherein, the first water outlet of the water storage box 11 is connected to the water inlet end of the heat pump unit 1 and forms the first pipe Road, the water inlet end of the water storage box 11 are connected to the water outlet of the heat pump unit 1 and are formed the second pipeline, the water supply pipe Water outlet be connected on first pipeline；

The water storage box 11, first pipeline, the heat pump unit 1 and second pipeline are sequentially connected and constitute and follow Ring type heating circuit A, the water supply pipe, first pipeline, the heat pump unit 1, the water storage box 11 are sequentially connected simultaneously Constitute directly-heated heating circuit；

The water supply pipe is equipped with the water supply pump 13 for being sequentially connected in series and being electrically connected respectively with the controller, the One electromagnetism two-port valve 3, flow sensor 2 and the second electromagnetism two-port valve 31, first pipeline are equipped with and the controller The water circulating pump 12 of electrical connection；The water level switch 21 and first being electrically connected respectively with the controller is equipped in the water storage box 11 Temperature sensor 22.

Water level switch 21 is equipped in the water storage box 11, the water level switch 21 is used to detect the water level of the water storage box 11 Situation；First temperature sensor 22 is set on the bottom of the water storage box 11, and first temperature sensor 22 is for detecting institute State the water temperature of water storage box 11；First pipeline is equipped with water circulating pump 12, the water inlet and the storage of the water circulating pump 12 First water outlet of water tank 11 is connected to；Second water outlet of the water storage box 11 is connected to by constant voltage water pump 14 with water end (W.E.) 4, with Make user open the hot water that can be obtained with water end (W.E.) 4 in the water storage box 11 carry out using；The water supply pipe is equipped with Flow sensor 2, the flow for water supply pipe described in real-time detection.

In the present embodiment, by the circulating heating circuit A of the heat pump hot-water system and directly-heated type heating circuit B, Heat pump hot-water system circulation-integrated heating function of directly-heated is realized, to achieve the purpose that mutual supplement with each other's advantages, and then improves heat The hot water deliverability of pump hot water machine is conducive to the usage comfort for improving user.

The water inlet end connection of the water supply pipe is external for system, and the water supply pipe is whole by the water supply pump 13 A heat pump hot-water system provides water source, passes through institute first by the water that the water supply pipe enters the heat pump hot-water system It states the first pipeline and is flowed into the heat pump unit 1 and heated, to obtain the higher water of temperature, and then the higher water of temperature It is flowed into the water storage box 11 and is stored by second pipeline, with for users to use.

Wherein, circulating heating mode run when, the water storage box 11, first pipeline, the heat pump unit 1 and Second pipeline is sequentially connected and constitutes circulating heating circuit A, and the lower water of 11 bottom temp of water storage box passes through institute It states the first pipeline and flows back into the heat pump unit 1 and reheated, become the higher water of temperature from the water storage box 11 Water inlet flows into the water storage box 11, so that the stability of the water temperature inside the water storage box 11 has been effectively kept, with full Sufficient user's uses coolant-temperature gage demand.

In the operation of directly-heated type heating mode, the lower water of temperature passes sequentially through the water supply pump of the water supply pipe 13, the first electromagnetism two-port valve 3, the flow sensor 2 and the second electromagnetism two-port valve 31 enter the heat pump In hot-water heating system, and enters in the heat pump unit 1 and heated by first pipeline, it is warm in the heat pump unit 1 Higher water is spent to flow into the water storage box 11 by second pipeline, it, can be effectively without carrying out abundant heating operation Avoid insufficient phenomenon occur when hot water demand's amount is larger.

The controller is greater than by the flow sensor 2 in the present flow rate for detecting the water supply pipe preset When minimum discharge, circulating heating mode is switched into directly-heated type heating mode；The controller detects the water level switch When 21 closure, then directly-heated type heating mode is switched into circulating heating mode；And during pattern switching, without carrying out It is unstable poor with users'comfort to efficiently solve the problems, such as that heat pump unit frequently stops machine bring water temperature for switch reconfiguration.

In this way, the present embodiment can be realized circulating-heating and directly heat the unification of function, it both can guarantee that user uses water The requirement of temperature, and it is able to satisfy the demand of user's water consumption, in circulating heating mode or directly-heated type heating mode, cold water is all It needs to first pass through and enters back into hot water storage tank supply user's use after the heat pump unit 1 heats, realize quick comfortable water heating, To be conducive to improve user's comforts of use.

Referring to Figure 1, in embodiments of the present invention, the heat pump unit 1 includes being electrically connected respectively with the controller Compressor 52, four-way valve 54, heat exchanger 5, blower 51 and the first electric expansion valve 53；

The exhaust outlet of the compressor 52 is connected to the port D of the four-way valve 54, the C port of the four-way valve 54 and institute State the first port connection of heat exchanger 5, the first end company of the second port of the heat exchanger 5 and first electric expansion valve 53 Logical, the second port of first electric expansion valve 53 is connected to the first port of finned heat exchanger locating for the blower 51, The second port of finned heat exchanger locating for the blower 51 is connected to the port E of the four-way valve 54, the S of the four-way valve 54 Port is connected to the gas returning port of the compressor 52；

Wherein, the water inlet of the heat exchanger 5 is connected to the water inlet end of the heat pump unit 1, the water outlet of the heat exchanger 5 Mouth is connected to the water outlet of the heat pump unit 1.

In the present embodiment, the heat pump unit 1 provides origin of heat for the preparation of hot water, the temperature in first pipeline Lower water is spent when by the heat exchanger 5, and the lower water of high temperature refrigerant and temperature in the heat exchanger 5 carries out hot friendship It changes, so that the water for flowing into second pipeline, which obtains enough heat heatings, becomes the higher water of temperature, and then most final temperature It spends higher water and is flowed into the water storage box 11 through second pipeline and stored or be used by a user.

In embodiments of the present invention, the heat pump hot-water system further includes with water end (W.E.) 4, constant voltage water pump 14 and third electromagnetism Second water outlet of two-port valve 35, the water storage box 11 water end (W.E.) 4, the third are used with described by the constant voltage water pump 14 distribution The first end of electromagnetism two-port valve 35 is connected to, and the second end of the third electromagnetism two-port valve 35 is connected to the water supply pipe；

The water storage box 11, the third electromagnetism two-port valve 35, the water supply pipe, first pipeline, the heat pump Unit 1 and second pipeline are sequentially connected and constitute Recovery of the hot water circuit C.

In the present embodiment, the heat pump hot-water system is provided with Recovery of the hot water circuit C, user can be not used Hot water carries out recycling heating by the Recovery of the hot water circuit C, and the water flowed out from the constant voltage water pump 14 is through the third electromagnetism Two-port valve 35 returns in the water supply pipe, then entered in the heat exchanger 5 by the water supply pipe re-start plus Heat reduces thermal losses to have effectively achieved Recovery of the hot water, realizes energy conservation and environmental protection, is conducive to improve making for user Use comfort level.

In embodiments of the present invention, the heat pump hot-water system further includes that the second temperature being electrically connected with the controller passes Sensor 23, the hot water that the second temperature sensor 23 is set between the third electromagnetism two-port valve 35 and the water supply pipe return It withdraws on the C of road.The second temperature sensor 23 is used to detect the water temperature of the Recovery of the hot water circuit C, consequently facilitating the control Device processed obtains the data of return water temperature.It should be understood that the flow sensor 2 includes but is not limited to pulse flowmeter, it is described First temperature sensor 22, second temperature sensor 23 include but is not limited to temperature-sensitive head etc., and the second electromagnetism two-port valve 31 wraps It includes but is not limited to warm water valve.

In embodiments of the present invention, the heat pump hot-water system further includes the first check valve 32；

First check valve 32 be set to first pipeline on, and the water inlet port of first check valve 32 with it is described The water outlet port of water circulating pump 12 is connected to, and the water inlet end of the water outlet port of first check valve 32 and the heat pump unit 1 connects Logical, the water outlet of the water supply pipe is connected to first pipe between first check valve 32 and the heat pump unit 1 On the road.

In the present embodiment, it should be noted that first check valve 32 has the function of one-way conduction；Specifically, In circulating heating mode, the water storage box 11, first pipeline, the heat pump unit 1 and second pipeline are successively Circulating heating circuit A is connected and constitutes, the lower water of 11 bottom temp of water storage box passes through the first of the water storage box 11 Water outlet is flowed into first pipeline, and the water circulating pump 12 is opened, and is delivered water into the heat pump unit 1 and is added Heat, in this process, first check valve 32 can be effectively prevented from the phenomenon that first pipeline is flow backwards, thus It ensure that in the water storage box 11 that the lower water of temperature is flow back into the heat pump unit 1 by first pipeline to carry out again Heating, and then become the higher water of temperature and flowed into the water storage box 11 from the water inlet of the water storage box 11, it maintains described The stability of water temperature inside water storage box 11, to meet the use coolant-temperature gage demand of user.

In embodiments of the present invention, the heat pump hot-water system further includes second one-way valve 33；The second one-way valve 33 Water inlet port be connected to the first end of the first electromagnetism two-port valve 3, the water outlet port of the second one-way valve 33 with it is described The second end of second electromagnetism two-port valve 31 is connected to, and the flow sensor 2 is connected to the second one-way valve 33 and described second On water supply pipe between electromagnetism two-port valve 31.

In the present embodiment, the second one-way valve 33 has the function of one-way conduction；Specifically, the second one-way valve 33 tap water that can be effectively prevented in the water supply pipe occur flowing backwards phenomenon, to ensure that the heat pump hot-water system Normal operation.

In embodiments of the present invention, the heat pump hot-water system further includes third check valve 34, the third check valve 34 Water inlet port be connected to the first end of the third electromagnetism two-port valve 35, the water outlet port of the third check valve 34 is connected to On water supply pipe between the second one-way valve 33 and the flow sensor 2.The third check valve 34 can be effectively Avoid the tap water in the water supply pipe be punched into the Recovery of the hot water circuit C cause it is described with 4 temperature of water end (W.E.) decline Phenomenon, so that the water of the Recovery of the hot water circuit C is able to be flowed into first pipeline by the water supply pipe, after And it obtains reheating and flow back into the water storage box 11.

In embodiments of the present invention, the heat pump hot-water system further includes water flow switch 15, and the water flow switch 15 is installed On second pipeline, and the water flow switch 15 is electrically connected with the controller.

Fig. 5 and Fig. 6 are referred to, the embodiment of the invention also provides a kind of control methods of heat pump hot-water system, are suitable for Such as above-mentioned heat pump hot-water system, comprising the following steps:

S11, the heat pump hot-water system operation when, the heat pump unit 1 is remained into open state；

S12, in the operation of circulating heating mode, open the water circulating pump 12 of first pipeline and keep the water supply The valve of pipeline is open state, and the present flow rate of water supply pipe described in real-time detection；

S13, when detect the water supply pipe present flow rate be greater than preset minimum discharge when, close the recirculated water Pump 12, to switch to directly-heated type heating mode；

S14, directly-heated type heating mode operation when, open the valve of the water supply pipe, and close the water circulating pump 12；

S15, when the water level switch 21 for detecting the water storage box 11 is closed, open the water circulating pump 12, close institute It states the valve of water supply pipe or reduces the valve opening of the water supply pipe, to switch to circulating heating mode.

The heating mode of the heat pump hot-water system is specific as follows:

As shown in Fig. 2, the heat pump hot-water system is when running circulating heating mode, temperature in the water storage box 1111 Lower water is flowed into first pipeline by the first exit end of the water storage box 11, so that the water circulating pump 12 will Water in first pipeline is input in the heat exchanger 5 and is heated, and the temperature after the heat exchanger 5 heating is higher Water then pass through second pipeline and flowed back in the water storage box 11 again, in this way, realizing institute by circulating heating mode The lower water temperature in water storage box 11 is stated, can be avoided hot water in the water storage box 11 leads to water temperature drop because of heat loss, has Conducive to the stability of water temperature in water storage box 11 is kept, to be conducive to improve the usage comfort of user.

Wherein, it should be noted that when user by it is described with water end (W.E.) 4 using hot water when, will lead to the water storage box Water in 11 reduces, therefore the normal operation in order to guarantee the heat pump hot-water system, in the operation of circulating heating mode, The circulating heating circuit A can be by the water supply pipe make-up water, to guarantee the hot water amount in the water storage box 11.

Further, since the water outlet of the water supply pipe is connected on first pipeline, the benefit in the water supply pipe Water supply can only be flowed into the heat exchanger 5 by first pipeline and be heated, and be directly added into avoid the lower water of temperature Lead to 11 water temperature drop of water storage box in the water storage box 11, to be conducive to improve the steady of water temperature in the water storage box 11 It is qualitative, and then be conducive to improve the usage comfort of user.

As shown in figure 3, the heat pump hot-water system is when running directly-heated type heating mode, external water system provide from Water is flowed into the heat pump hot-water system by the water supply pipe, and the lower water of the temperature of the water supply pipe passes through described First pipeline is flowed into the heat exchanger 5 and is heated, and the higher water of temperature after the heat exchanger 5 heating then passes through institute It states the second pipeline to flow back to again in the water storage box 11, in this way, user can be quickly obtained hot water with water end (W.E.) 4 by described.

In addition, in embodiments of the present invention, in the case where reply operating condition is more severe, when the flow of the water supply pipe When sensor 2 detects that flow is lower than preset minimum discharge for a long time, then the water circulating pump 12, and the water supplying pipe are opened Road is not also closed, and water mixing and heating state is entered；

It should be noted that: the more severe situation of operating condition includes: that environment temperature is lower than 0 DEG C, originally water route inflow temperature Lower than 4 DEG C, these belong to such environmental effects to the heat pump unit 1, cause itself to adjust the flow for arriving the water supply pipe Very low operating condition；Or the inflow of the water supply pipe is insufficient, that is to say, that water supply flow is very low, this belongs to insufficient water Operating condition.

Therefore, the method also includes:

S16, when detecting current environmental temperature lower than preset minimum temperature, start water mixing and heating mode；Or,

S17, the water temperature for detecting the water supply pipe be lower than preset minimum supply water temperature when, start water mixing and heating mould Formula；Or,

S18, when the present flow rate for detecting the water supply pipe is less than the preset minimum discharge, start mixed water and add Heat pattern；

Wherein, it in water mixing and heating mode operation, opens the water circulating pump 12 and keeps the valve of the water supply pipe For open state.

In order to facilitate the understanding of the present invention, below by one of the control method to heat pump hot-water system provided by the invention A little preferred embodiments are described in further detail.

A, the circulating heating mode under low water level state:

Fig. 7 is referred to, in a kind of wherein embodiment, described in heat pump hot-water system operation, by the heat After the step of pump assembly 1 remains open state, the method also includes:

When detecting that the water level switch 21 disconnects, determine that the water storage box 11 is low water level state；

When current hot water temperature's value is less than preset first object temperature value R02, switch under low water level state To circulating heating mode；

And in the circulating heating mode operation under low water level state, only when current hot water temperature's value is greater than in advance If first object temperature value R02 when, directly-heated type heating mode is switched under low water level state；

When current hot water temperature's value is greater than preset first object temperature value R02, switch under low water level state To directly-heated type heating mode；

In the operation of directly-heated type heating mode and the holding low water level state of the water storage box 11, directly-heated type heating mode is calculated Runing time；

When the runing time of directly-heated type heating mode is greater than preset first directly-heated runing time R06, the storage is judged Whether current hot water temperature's value of water tank 11 is less than preset second target temperature value, if so, switching under low water level state To circulating heating mode；

In the present embodiment, it should be noted that after the heat pump hot-water system starting up, the controller is first examined The state for surveying the water level switch 21 then determines that the water storage box 11 is low water level state, and the method for operation is specific as follows:

1, when just booting, judge that current hot water temperature's value is less than preset first object temperature value R02, it is described Heat pump hot-water system enters the circulating heating mode under low water level state.

2, when just booting, only judge that current hot water temperature's value is greater than preset first object temperature value R02 When, the heat pump hot-water system, which enters, just enters directly-heated type heating mode.

Wherein, the circulating heating mode under low water level state is switched to directly-heated type heating mode, needs to meet described work as Preceding hot water temperature's value is greater than this condition of preset first object temperature value R02.

And directly-heated type heating mode is switched to the circulating heating mode under low water level state, needs to meet water storage box 11 Current hot water temperature's value is lower than this condition of R02-R03, and the preset first directly-heated runing time R06 should be greater than R06。

In the present embodiment, it should be noted that when running the circulating heating mode under low water level state, judge institute Whether the current hot water temperature for stating water storage box 11 is less than preset 4th target temperature value；Wherein, preset 4th target Temperature value is the difference that the preset first object temperature value R02 and directly-heated type heating mode switch back into difference R05；

If so, starting the compressor 52 of the heat pump unit 1, and opened in start the compressor 52 preset first Before dynamic time P01, start the water circulating pump 12, and the preset second starting time for starting the compressor 52 it Before, start the blower 51 of the heat pump unit 1.

Wherein, it should be noted that the load under circulating heating mode under low water level state has: the compressor 52, the blower 51, the water circulating pump 12, the four-way valve 54, crankshaft heating band, drip tray heating tape, first electricity Sub- expansion valve 53, electric heater and the warning device.Wherein, the preset first directly-heated runing time R06 is 90s.

Just booting when, and determine enter low water level state under circulating heating mode when:

Load opening sequence: water circulating pump 12 in advance open by the compressor 52P01 time, and blower 51 shifts to an earlier date compressor 5210s It opens, compressor 52 is opened in the case where current hot water temperature<R02-R03, until current hot water temperature>=R02, is switched to Directly-heated type heating mode, remaining load unlocking condition refer to each self-supported explanation.

B, directly-heated type heating mode:

Refer to figure, 8, in the operation of directly-heated type heating mode, when detecting the water level switch 21 closure, determine institute Stating water storage box 11 is high water level state；Or, determining that the water storage box 11 is Gao Shui when detecting the water level switch 21 closure Position state；It controls heat pump hot-water system and switches to circulating heating mode from directly-heated type heating mode；

Keeping the compressor 52 of the heat pump unit 1, blower 51 is operating status, starts the water circulating pump 12；

After starting the water circulating pump 12, the state of the water flow switch 15 on second pipeline is detected；

When detecting the water flow switch 15 closure, then the preset third after the water circulating pump 12 starting opens After the dynamic time, the valve of the water supply pipe is closed；

When detecting that the water flow switch 15 disconnects, start the turn-off time for calculating the water flow switch 15；

When the turn-off time of the water flow switch 15 being equal to preset first report Downtime, then carried out by report barrier equipment Report barrier.

Wherein, it should be noted that the load under directly-heated type heating mode has: the compressor 52, the blower 51, Two electromagnetism two-port valves 31, crankshaft heating band, drip tray heating tape, first electric expansion valve 53, the first electromagnetism two-port valve 3, Water supply pump 13, electric heating, alarm.

In rigid booting, when determining to enter directly-heated type heating mode:

Load opening sequence: blower 51, the first electromagnetism two-port valve 3, tap water water pump and the second electromagnetism two-port valve 31 shift to an earlier date Compressor 5210s is opened, after compressor 52 is opened, if detecting the current hot water temperature's value < R02-R03 and directly-heated operation Time meets H09 and the water level switch 21 disconnects, then the circulating heating mode being switched under low water level state；If detection It is closed to the water level switch 21, then the circulating heating mode being switched under high water level state.

C, the circulating heating mode under high water level state:

Fig. 9 is referred to, when detecting the water level switch 21 closure, determines that the water storage box 11 is high water level state；

When current hot water temperature's value is less than preset third target temperature value, switches to and follow under high water level state Ring type heating mode；Wherein, the preset third target temperature value is the preset first object temperature value R02 and presets Constant temperature shut down the sum of return difference value.

In the present embodiment, it should be noted that when running the circulating heating mode under high water level state, judge institute It states whether heat pump hot-water system meets constant temperature halt condition, if it is not, then starting the compressor 52 of the heat pump unit 1, and is opening Before the preset first starting time P01 for moving the compressor 52, start the water circulating pump 12, and starting the pressure Before the preset second starting time of contracting machine 52, start the blower 51 of the heat pump unit 1.

In the present embodiment, it should be noted that the load under circulating heating mode under high water level state has: described It is compressor 52, the blower 51, the water circulating pump 12, the four-way valve 54, crankshaft heating band, drip tray heating tape, described First electric expansion valve 53, electric heating, the warning device.

In rigid booting, when determining the circulating heating mode entered under high water level state:

Load opening sequence: the water circulating pump 12 in advance open by the compressor 52P01 time, and the blower 51 shifts to an earlier date The compressor 5210s is opened, and the compressor 52 is opened in the case where being unsatisfactory for constant temperature and shutting down, remaining load unlocking condition With reference to each self-supported explanation.

D, the circulating heating mode under low water level state is switched to by directly-heated type heating mode:

Referring to Figure 10, in a kind of wherein embodiment, the method also includes:

When running directly-heated type heating mode, start the compressor 52 of the heat pump unit 1, and starting the compressor Before 52 preset first starting time P01, starts the blower 51 of the heat pump unit 1 and open the valve of the water supply pipe Door；

After the runing time for determining directly-heated type heating mode is greater than the first directly-heated runing time R06, the storage is judged Whether the current hot water temperature of water tank 11 is less than preset 4th target temperature value, if so, according to the water level switch 21 Disconnect circulating heating mode directly-heated type heating mode switched under low water level state.

In the present embodiment, it should be noted that load opening sequence: the compressor 52, the blower 51 are kept Open state, the water circulating pump 12 are first opened, and the water flow switch 15 is detected, if the water flow switch 15 is closed in 10s, Then the first electromagnetism two-port valve 3 and water supply pump 13 are closed after the water circulating pump 12 opens 10s, the second electromagnetism two-way Valve 31 is closed；Water flow failure is reported if being constantly in off-state in the water flow switch 1510s.The first electromagnetism two-way Valve 3 just runs the circulating heating mode under low water level state after closing.

E, the circulating heating mode under high water level state is switched to by directly-heated type heating mode:

Referring to Figure 11, in a kind of wherein embodiment, the method also includes:

After the runing time for determining directly-heated type heating mode is greater than the first directly-heated runing time R06, the storage is judged Whether the current hot water temperature of water tank 11 is less than preset 4th target temperature value, if so, according to the water level switch 21 Directly-heated type heating mode is switched to the circulating heating mode under high water level state by closure.

In the present embodiment, it should be noted that load opening sequence: the compressor 52, the blower 51 are kept Open state, the water circulating pump 12 are first opened, and the water flow switch 15 is detected, if the water flow switch 15 is closed in 10s, Then the first electromagnetism two-port valve 3 and water supply pump 13 are closed after the water circulating pump 12 opens 10s, the second electromagnetism two-way Valve 31 is closed；Water flow failure is reported if being constantly in off-state in the water flow switch 1510s.The first electromagnetism two-way Valve 3 just runs the circulating heating mode under high water level state after closing.

F, directly-heated type heating mode is switched to by the circulating heating mode under low water level state:

Referring to Figure 12, when detecting that the water level switch 21 disconnects, determine that the water storage box 11 is low water level state, The heating mode of the heat pump hot-water system is the circulating heating mode under low water level state；

Keep the compressor 52, blower 51, the water circulating pump 12 of the heat pump unit 1 for operating status, described in unlatching The valve of water supply pipe；

When the present flow rate for detecting the water supply pipe is greater than preset minimum discharge, the water supply pipe is being closed Valve the second shut-in time after, the water circulating pump 12 is closed, by the circulating heating mode under low water level state Switch to directly-heated type heating mode.

In the present embodiment, it should be noted that load opening sequence: the blower 51, described follows at the compressor 52 Ring water pump 12 is kept it turning on, and opens the first electromagnetism two-port valve 3, the water supply pump 13 and the second electromagnetism two-port valve 31,10s When the interior flow sensor 2 detects the flow in the water supply pipe and meets minimum flow, in the first electromagnetism two-port valve 3 The water circulating pump 12 is closed after opening 10s, runs directly-heated type heating mode.

G, directly-heated type heating mode is switched to by the circulating heating mode under high water level state:

Referring to Figure 13, in a kind of wherein embodiment, the method also includes:

When detecting the water level switch 21 closure, determine that the water storage box 11 is high water level state, the Heat Pump The heating mode of water system is the circulating heating mode under high water level state；

When detecting that the heat pump unit 1 is in the state of constant temperature shutdown, the compressor of the heat pump unit 1 is opened 52, and before the preset third starting time of the compressor 52 of the heat pump unit 1 starting, open the heat pump unit 1 Blower 51 and the water supply pipe valve；

When the present flow rate for detecting the water supply pipe is greater than preset minimum discharge, the water circulating pump is closed 12, the circulating heating mode under high water level state is switched into directly-heated type heating mode；

Preferably, in conjunction with the constant temperature shutdown status of the heat pump unit 1, the method also includes:

When detecting that the heat pump unit 1 is in the state of constant temperature shutdown, the compressor of the heat pump unit 1 is opened 52, and before the preset third starting time of the compressor 52 of the heat pump unit 1 starting, open the heat pump unit 1 Blower 51 and the water supply pipe valve, the water circulating pump 12 is closed, by the circulating heating under high water level state Pattern switching is to directly-heated type heating mode；

When detecting that the heat pump unit 1 is in the state of non-constant temperature shutdown, the compressor of the heat pump unit 1 is kept 52, blower 51 is operating status, and opens the valve of the water supply pipe；

When the present flow rate for detecting the water supply pipe is greater than preset minimum discharge, the water supply pipe is being closed Valve the first shut-in time after, the water circulating pump 12 is closed, by the circulating heating mode under high water level state Switch to directly-heated type heating mode.

In the present embodiment, it should be noted that load opening sequence: if in the state that constant temperature is shut down, blower 51, The first electromagnetism two-port valve 3, the water supply pump 13 and the second electromagnetism two-port valve 31 shift to an earlier date the compressor 5210s and open, The flow that the flow sensor 2 detects in the water supply pipe meets minimum flow, is then turned on the compressor 52, closes institute Water circulating pump 12 is stated, water flow failure is otherwise reported；If not constant temperature shut down in the state of, the blower 51, the compressor 52, The water circulating pump 12 is kept it turning on, and opens the first electromagnetism two-port valve 3, and the flow sensor 2 detects the confession in 10s Flow in water lines meets minimum flow, and the first electromagnetism two-port valve 3 closes the water circulating pump 12 after opening 10s, transports Row directly-heated type heating mode.

H, the circulating heating mode under low water level state is switched to by the circulating heating mode under high water level state:

Referring to Figure 14, in a kind of wherein embodiment, the method also includes:

Under constant temperature shutdown status, as the current hot water temperature's value≤R02-R03, by the circulation under high water level state Formula heating mode switches to the circulating heating mode under low water level state；

Wherein, load opening sequence: the water circulating pump 12 in advance open by the compressor 52P01 time, the blower 51, which shift to an earlier date the compressor 5210s, opens, and the compressor 52 is opened in the case where the current hot water temperature's value < R02-R03 It opens, until the current hot water temperature's value > R02, is switched to directly-heated type heating mode, remaining load unlocking condition is thought highly of oneself with reference to each Carry explanation.

I, water mixing and heating mode is switched to by directly-heated type heating mode:

In a kind of wherein embodiment, the method also includes:

When directly-heated type heating mode is run, run in the runing time of directly-heated type heating mode greater than preset first directly-heated When time R06, the water circulating pump 12 is opened, runs water mixing and heating mode.

The meaning and default value of above-mentioned parameter are as shown in table 1.

Table 1

In conclusion the embodiment of the invention provides a kind of control method of heat pump hot-water system, suitable for such as above-mentioned Heat pump hot-water system, comprising steps of S11, the heat pump hot-water system operation when, the heat pump unit 1 is remained into unlatching State；S12, in the operation of circulating heating mode, open the water circulating pump 12 of first pipeline and keep the water supplying pipe The valve on road is open state, and the present flow rate of water supply pipe described in real-time detection；S13, when detecting the water supply pipe Present flow rate be greater than preset minimum discharge when, the water circulating pump 12 is closed, to switch to directly-heated type heating mode；S14, In the operation of directly-heated type heating mode, the valve of the water supply pipe is opened, and close the water circulating pump 12；S15, work as detection To the water storage box 11 water level switch 21 be closed when, open the water circulating pump 12, close the water supply pipe valve or Reduce the valve opening of the water supply pipe, to switch to circulating heating mode.

(1) by the way that circulating heating mode and directly-heated type heating mode are fused into a heat pump hot-water system in system, And the cold water in circulating heating mode and directly-heated type heating mode is all to enter back into water storage after needing to first pass through heat exchanger heating Case supplies user and uses, and realizes quick comfortable water heating；

(2) it is cut in system by the flow and the water level switch closed state of the detection heat supplying pipeline come judgment model Change, avoid frequently stop machine carry out pattern switching brought by water temperature it is unstable and enhancing user's comfort；

(3) by the water level switch closed state and water temperature comprehensive descision Heat Pump water system in hardware and software control System free switching under low water level circulating-heating, high water temperature circulating-heating, directly-heated heating and four modes of water mixing and heating, realizes Quickly, energy conservation and comfortable water heating；

(4) by the circulating heating circuit A of the heat pump hot-water system and directly-heated type heating circuit B, heat pump is realized Hot-water heating system circulation-integrated the heating function of directly-heated to achieve the purpose that mutual supplement with each other's advantages, and then improves heat pump water-heating machine Hot water deliverability is conducive to the usage comfort for improving user；And during pattern switching, without carrying out switch weight It sets, it is unstable poor with users'comfort to efficiently solve the problems, such as that heat pump unit frequently stops machine bring water temperature.

(5) the water inlet end connection of the water supply pipe is external for system, and the water supply pipe passes through the water supply pump 13 Water source is provided for the entire heat pump hot-water system, the water for entering the heat pump hot-water system by the water supply pipe is logical first It crosses first pipeline and is flowed into the heat pump unit 1 and heated, to obtain the higher water of temperature, and then temperature is higher Water be flowed into the water storage box 11 and stored by second pipeline, with for users to use.

(6) when circulating heating mode is run, the water storage box 11, first pipeline, the heat pump unit 1 and institute It states the second pipeline and is sequentially connected and constitutes circulating heating circuit A, the lower water of 11 bottom temp of water storage box passes through described First pipeline flows back into the heat pump unit 1 and is reheated, become the higher water of temperature from the water storage box 11 into The mouth of a river flows into the water storage box 11, so that the stability of the water temperature inside the water storage box 11 has been effectively kept, to meet User's uses coolant-temperature gage demand.

The controller is greater than by the flow sensor 2 in the present flow rate for detecting the water supply pipe preset When minimum discharge, circulating heating mode is switched into directly-heated type heating mode；The controller detects the water level switch When 21 closure, then directly-heated type heating mode is switched into circulating heating mode.

(7) the present embodiment can be realized circulating-heating and directly heat the unification of function, both can guarantee that user uses water temperature Requirement, and be able to satisfy the demand of user's water consumption, in circulating heating mode or directly-heated type heating mode, cold water is all to need It first passes through and enters back into hot water storage tank supply user's use after the heat pump unit 1 heats, realize quick comfortable water heating, from And be conducive to improve user's comforts of use.

The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art For, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also considered as Protection scope of the present invention.

Claims

1. a kind of heat pump hot-water system, which is characterized in that including controller, heat pump unit, water storage box and water supply pipe；It is described First water outlet of water storage box is connected to the water inlet end of the heat pump unit and is formed the first pipeline, the water inlet end of the water storage box The second pipeline is connected to and formed with the water outlet of the heat pump unit, and the water outlet of the water supply pipe is connected to first pipe On the road；

The water storage box, first pipeline, the heat pump unit and second pipeline are sequentially connected and constitute circulating add Hot loop, the water supply pipe, first pipeline, the heat pump unit, the water storage box, which are sequentially connected and constitute directly-heated, to be added Hot loop；

The water supply pipe is equipped with water supply pump, the first electromagnetism for being sequentially connected in series and being electrically connected respectively with the controller Two-port valve, flow sensor and the second electromagnetism two-port valve, first pipeline are equipped with and follow with what the controller was electrically connected Ring water pump；The water level switch and temperature sensor being electrically connected respectively with the controller are equipped in the water storage box.

2. heat pump hot-water system as described in claim 1, which is characterized in that the heat pump unit include respectively with the control Compressor, four-way valve, heat exchanger, blower and the first electric expansion valve of device electrical connection；

The exhaust outlet of the compressor is connected to the port D of the four-way valve, the C port of the four-way valve and the heat exchanger First port connection, the second port of the heat exchanger are connected to the first end of first electric expansion valve, first electricity The second port of sub- expansion valve is connected to the first port of finned heat exchanger locating for the blower, fin locating for the blower The second port of heat exchanger is connected to the port E of the four-way valve, the port S of the four-way valve and the gas returning port of the compressor Connection；

Wherein, the water inlet of the heat exchanger is connected to the water inlet end of the heat pump unit, the water outlet of the heat exchanger and institute State the water outlet connection of heat pump unit.

3. heat pump hot-water system as claimed in claim 1 or 2, which is characterized in that the heat pump hot-water system further includes using water End, constant voltage water pump and third electromagnetism two-port valve, the second water outlet of the water storage box is distributed by the constant voltage water pump and institute State the first end connection with water end (W.E.), the third electromagnetism two-port valve, the second end and the water supply of the third electromagnetism two-port valve Pipeline connection；

The water storage box, the third electromagnetism two-port valve, the water supply pipe, first pipeline, the heat pump unit and institute The second pipeline is stated to be sequentially connected and constitute Recovery of the hot water circuit.

4. a kind of control method of heat pump hot-water system is suitable for Heat Pump water system as claimed in any one of claims 1 to 3 System, which comprises the following steps:

In the operation of circulating heating mode, opens the water circulating pump of first pipeline and keep the valve of the water supply pipe For open state, and the present flow rate of water supply pipe described in real-time detection；

Start in system or in the operation of circulating heating mode, when the present flow rate for detecting the water supply pipe be greater than it is pre- If minimum discharge when, the water circulating pump is closed, to switch to directly-heated type heating mode；

When the water level switch for detecting the water storage box is closed, the water circulating pump is opened, the valve of the water supply pipe is closed Door or the valve opening for reducing the water supply pipe, to switch to circulating heating mode.

5. the control method of heat pump hot-water system as claimed in claim 4, which is characterized in that described in the heat-pump hot-water When system is run, after the step of heat pump unit is remained open state, the method also includes:

When current hot water temperature's value is less than preset first object temperature value, switched under low water level state circulating Heating mode；

When current hot water temperature's value is greater than preset first object temperature value, directly-heated type is switched under low water level state Heating mode；

In the operation of directly-heated type heating mode and water storage box holding low water level state, the operation of directly-heated type heating mode is calculated Time；

When the runing time of directly-heated type heating mode is greater than preset first directly-heated runing time, working as the water storage box is judged Whether preceding hot water temperature's value is less than preset second target temperature value, if so, switching to circulating add under low water level state Heat pattern；

When current hot water temperature's value is less than preset third target temperature value, switched under high water level state circulating Heating mode；Wherein, the preset third target temperature value is the preset first object temperature value and preset constant temperature Shut down the sum of return difference value.

6. the control method of heat pump hot-water system as claimed in claim 5, which is characterized in that the method also includes:

When running the circulating heating mode under low water level state, judge whether the current hot water temperature of the water storage box is less than Preset 4th target temperature value；Wherein, preset 4th target temperature value is the preset first object temperature value And the difference of directly-heated pattern switching return difference value；

If so, start the compressor of the heat pump unit, and the preset first starting time for starting the compressor it Before, start the water circulating pump, and before starting the preset second starting time of the compressor, start the heat pump The blower of unit；

When running the circulating heating mode under high water level state, judge whether the heat pump hot-water system meets constant temperature shutdown Condition, if it is not, then start the compressor of the heat pump unit, and the preset first starting time for starting the compressor it Before, start the water circulating pump, and before starting the preset second starting time of the compressor, start the heat pump The blower of unit.

7. the control method of heat pump hot-water system as claimed in claim 4, which is characterized in that the method also includes:

In the operation of directly-heated type heating mode, when detecting water level switch closure, determine the water storage box for high water level State；Or, determining the water storage box for high water level state when detecting water level switch closure；Control Heat Pump water system System switches to circulating heating mode from directly-heated type heating mode；

When detecting water flow switch closure, then the preset third after water circulating pump starting starts the time Afterwards, the valve of the water supply pipe is closed；

When the turn-off time of the water flow switch being equal to preset first report Downtime, then report barrier is carried out by report barrier equipment.

8. the control method of heat pump hot-water system as claimed in claim 5, which is characterized in that the method also includes:

In the heat pump hot-water system startup, when the present flow rate for detecting the water supply pipe is greater than preset minimum discharge When, start directly-heated type heating mode；

When running directly-heated type heating mode, start the compressor of the heat pump unit, and starting the default of the compressor The first starting time before, start the blower of the heat pump unit and open the valve of the water supply pipe；

After the runing time for determining directly-heated type heating mode is greater than the first directly-heated runing time, working as the water storage box is judged Whether preceding hot water temperature is less than preset 4th target temperature value, if so, according to the disconnection of the water level switch by directly-heated type Heating mode switches to the circulating heating mode under low water level state；Or directly-heated type is added according to the closure of the water level switch Heat pattern switches to the circulating heating mode under high water level state.

9. the control method of heat pump hot-water system as claimed in claim 4, which is characterized in that the method also includes:

When detect the water level switch closure when, determine the water storage box for high water level state, the heat pump hot-water system Heating mode is the circulating heating mode under high water level state；

When detecting that the heat pump unit is in the state of constant temperature shutdown, the compressor of the heat pump unit is opened, and in institute State the compressor start of heat pump unit preset third starting the time before, open the heat pump unit blower and the confession The valve of water lines；

When the present flow rate for detecting the water supply pipe is greater than preset minimum discharge, the water circulating pump is closed, it will Circulating heating mode under high water level state switches to directly-heated type heating mode；

When detect the water level switch disconnect when, determine the water storage box for low water level state, the heat pump hot-water system Heating mode is the circulating heating mode under low water level state；

The compressor, blower, the water circulating pump for keeping the heat pump unit are operating status, open the valve of the water supply pipe Door；

When the present flow rate for detecting the water supply pipe is greater than preset minimum discharge, in the valve for closing the water supply pipe After second shut-in time of door, the water circulating pump is closed, the circulating heating mode under low water level state is switched to Directly-heated type heating mode.

10. the control method of heat pump hot-water system as claimed in claim 4, which is characterized in that the method also includes:

When detecting that the heat pump unit is in the state of constant temperature shutdown, the compressor of the heat pump unit is opened, and in institute State the compressor start of heat pump unit preset third starting the time before, open the heat pump unit blower and the confession The valve of water lines closes the water circulating pump, and the circulating heating mode under high water level state is switched to directly-heated type and is added Heat pattern；

When detecting that the heat pump unit is in the state of non-constant temperature shutdown, compressor, the blower of the heat pump unit are kept For operating status, and open the valve of the water supply pipe；

When the present flow rate for detecting the water supply pipe is greater than preset minimum discharge, in the valve for closing the water supply pipe After first shut-in time of door, the water circulating pump is closed, the circulating heating mode under high water level state is switched to Directly-heated type heating mode.