CN110296490A - Hot water units and its control method with constant-temperature hot water function - Google Patents

Hot water units and its control method with constant-temperature hot water function Download PDF

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Publication number
CN110296490A
CN110296490A CN201910568674.4A CN201910568674A CN110296490A CN 110296490 A CN110296490 A CN 110296490A CN 201910568674 A CN201910568674 A CN 201910568674A CN 110296490 A CN110296490 A CN 110296490A
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China
Prior art keywords
water
triple valve
heat exchange
heat
exchanging pipe
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CN201910568674.4A
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Chinese (zh)
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CN110296490B (en
Inventor
朱俊威
姜田
马定超
秦自强
曾凡卓
吴明明
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Priority to CN201910568674.4A priority Critical patent/CN110296490B/en
Publication of CN110296490A publication Critical patent/CN110296490A/en
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Publication of CN110296490B publication Critical patent/CN110296490B/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/89Arrangement or mounting of control or safety devices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/30Arrangement or mounting of heat-exchangers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0096Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater combined with domestic apparatus

Abstract

The present invention provides a kind of Hot water units and its control method with constant-temperature hot water function.Hot water units include the refrigerant heat exchanger circulation and water heat exchange cycle with heat exchange, it further include water tank, two sets of heat exchanging pipes are provided in the water tank, and the both ends of a set of heat exchanging pipe are connected to the water heat exchange cycle, the both ends of another heat exchanging pipe are connected to refrigerant heat exchanger circulation.Hot water units and its control method provided by the invention with constant-temperature hot water function, two sets of heat exchanging pipes are set in water tank, according to the demand of user, switch the working condition of the first triple valve and the second triple valve, to separately or concurrently be heated to the water in water tank using refrigerant and water, the comfort level of indoor heating when promoting water heating, and domestic hot-water's case can be given and play certain insulation effect, eliminate the frequent switching phenomenon of heating and water heating function, promote unit combined reliability, Unit Commitment is reduced, to improve the service life of complete machine.

Description

Hot water units and its control method with constant-temperature hot water function
Technical field
The present invention relates to technical field of heat exchange equipment, especially a kind of Hot water units and its control with constant-temperature hot water function Method processed.
Background technique
Multifunction water heating machine generally has heating, water heating, refrigerating function at present.User side equipment have domestic hot-water's case, Fan coil, grounding heat coil tube.Conversion between heating, refrigeration and water heating is switched by electric T-shaped valve, and Heating Season is worked as When section, it is switched to water heating function from heating, Multifunction water heating machine heating supplying hot water is recycled to water tank coil pipe hot water preparing, at this time User side heating terminal equipment (fan coil, grounding heat coil tube) just stopped heat exchange cycle, and domestic hot-waters' case water temperature to be waited to reach Electric T-shaped valve, which can just act, when setting target water tank temperature is switched to heating circulation, thus in this period of time of water heating It is interior, room temperature can be impacted and reduce, fluctuations in indoor temperature brings bad body-sensing to user, and heating comfort level reduces.Separately One side Multifunction water heating machine belongs to big power consumer, and especially continual water heating and heating, refrigerating function switch, serious shadow Unit efficiency is rung, unit durability can be also lost in the movements such as frequent switching on and shutting down, reduce use reliability.Customer using cost also can It is substantially increased, influences usage experience.
Summary of the invention
In order to solve the technical issues of existing Hot water units can not be heated in water heating, and provides a kind of while producing heat The Hot water units and its control method with constant-temperature hot water function of water and heating.
A kind of Hot water units further include water tank including refrigerant heat exchanger circulation and water heat exchange cycle with heat exchange, institute It states and is provided with two sets of heat exchanging pipes in water tank, and the both ends of a set of heat exchanging pipe are connected to the water heat exchange cycle, it is another The both ends of the heat exchanging pipe are connected to refrigerant heat exchanger circulation.
The Hot water units further include on off mechanism, and the on-off machine is provided on each heat exchanging pipe Structure.
The heat exchanging pipe includes the first heat exchanging pipe and the second heat exchanging pipe, and first heat exchanging pipe is changed with the water Thermal cycle connection, second heat exchanging pipe are connected to refrigerant heat exchanger circulation.
The on off mechanism is triple valve, and including the first triple valve and the second triple valve, the first triple valve setting Between first heat exchanging pipe and the water heat exchange cycle, and the entrance and first triple valve of first triple valve First outlet be connected to the water heat exchange cycle, the second outlet of first triple valve is connected to the heat exchanging pipe, Second triple valve is set between second heat exchanging pipe and refrigerant heat exchanger circulation, and second triple valve Entrance and the first outlet of second triple valve be connected to refrigerant heat exchanger circulation, the of second triple valve Two outlets are connected to second heat exchanging pipe.
The Hot water units further include heat exchanger, and the refrigerant heat exchanger circulation and the water heat exchange cycle are in the heat exchange Heat exchange is carried out in device.
The refrigerant heat exchanger circulation further includes throttle mechanism, and second triple valve is set to the throttle mechanism and institute It states between heat exchanger, and the first outlet of second triple valve is connected to the throttle mechanism, second triple valve enters Mouth is connected to the heat exchanger.
The first end of second heat exchanging pipe is connected to the second outlet of second triple valve, second end and the section Flow position connection between mechanism and the heat exchanger.
The Hot water units further include multiple heat exchange load, all heat exchange load in series or are arranged in parallel in the water On heat exchange cycle.
The heat exchange load includes fan coil and grounding heat coil tube, and the fan coil and the grounding heat coil tube are arranged in series In on the water heat exchange cycle.
The water outlet of the fan coil is connected to the water inlet of the grounding heat coil tube.
A kind of control method of above-mentioned Hot water units, the heat exchanging pipe include the second heat exchanging pipe, and described second changes Pipe line is connected to refrigerant heat exchanger circulation, and the control method includes:
S1, setting water tank target temperature Tw1 and water tank temperature deviation limit value a, b (a > b);
Water temperature T w in S2, real-time detection water tank, and calculate water tank temperature difference △ T1=| Tw1-Tw |;
S3, compare △ T1 and a, b, and adjust the on-off of the second heat exchanging pipe and refrigerant heat exchanger circulation according to comparison result State.
In step s3 further include:
If △ T1 > a, recycle second heat exchanging pipe and the refrigerant heat exchanger in connected state;
If a >=△ T1 > b, the on off operating mode for keeping second heat exchanging pipe to recycle with the refrigerant heat exchanger is constant;
If b >=△ T1, recycles second heat exchanging pipe with the refrigerant heat exchanger and be in an off state.
The Hot water units include the second triple valve, and second triple valve is set to second heat exchanging pipe and described Between refrigerant heat exchanger circulation, and the entrance of second triple valve and the first outlet are recycled with the refrigerant heat exchanger Connection, the second outlet of second triple valve are connected to second heat exchanging pipe, in step s3 further include:
If △ T1 > a, the entrance of second triple valve are connected to the second outlet of second triple valve;
If a >=△ T1 > b, keep the state of second triple valve constant;
If b >=△ T1, it is connected to the entrance of second triple valve and the first outlet of second triple valve.
The heat exchanging pipe includes the first heat exchanging pipe, and first heat exchanging pipe is connected to the water heat exchange cycle, institute Stating Hot water units includes heat exchanger, and the refrigerant heat exchanger circulation and the water heat exchange cycle carry out hot friendship in the heat exchanger It changes, the Hot water units further include multiple heat exchange load, all heat exchange load in series or are arranged in parallel in water heat exchange In circulation, the control method further include:
S01, the leaving water temperature deviation limit value c for setting heat exchanger, load temperature difference limit value d and the outflow of water heat exchange cycle are changed The target leaving water temperature To1 of hot device;
S02, the inflow temperature Ti of real-time detection water heat exchange cycle inflow heat exchanger, water heat exchange cycle outflow heat exchanger go out Coolant-temperature gage To, and calculate temperature difference of outlet water △ T2=To1-To and temperature difference of heat exchanger △ T3=To-Ti;
S03, it is respectively compared △ T2 and c, △ T1 and a, b and △ T3 and d, and first heat exchange is adjusted according to comparison result The on off operating mode of pipeline and water heat exchange cycle.
In step S03 further include:
If △ T2 > c and △ T1 > a, first heat exchanging pipe are in an off state with water heat exchange cycle;
If △ T2 > c and a >=△ T1 > b, the on off operating mode of first heat exchanging pipe and water heat exchange cycle are constant;
If △ T2 > c and △ T1≤b, first heat exchanging pipe and water heat exchange cycle are in connected state;
If △ T2≤c and △ T3 > d, first heat exchanging pipe are in an off state with water heat exchange cycle;
If △ T2≤c and △ T3≤d, first heat exchanging pipe and water heat exchange cycle are in connected state.
The Hot water units further include the first triple valve, and first triple valve is set to first heat exchanging pipe and institute It states between water heat exchange cycle, and the entrance of first triple valve and first outlet are connected to the water heat exchange cycle, it is described The second outlet of first triple valve is connected to the heat exchanging pipe, in step S03 further include:
If △ T2 > c and △ T1 > a, the first outlet of the entrance of first triple valve and first triple valve connects It is logical;
If △ T2 > c and a >=△ T1 > b, the state of first triple valve are constant;
If △ T2 > c and △ T1≤b, the second outlet of the entrance of first triple valve and first triple valve connects It is logical;
If △ T2≤c and △ T3 > d, the first outlet of the entrance of first triple valve and first triple valve connects It is logical;
If △ T2≤c and △ T3≤d, the second outlet of the entrance of first triple valve and first triple valve connects It is logical.
Before step S1 further include: judge the working condition of Hot water units:
If the Hot water units are in heating mode, continue step S2 and step S3;
If the Hot water units are in refrigeration mode, two sets of heat exchanging pipes are in off-state.
Hot water units and its control method provided by the invention with constant-temperature hot water function are arranged two in water tank and buy or get by illegal means Pipe line switches the working condition of the first triple valve and the second triple valve, to make according to the demand of user's heating and water heating Separately or concurrently the water in water tank is heated with refrigerant and water, the comfort level of indoor heating when promoting water heating, and Domestic hot-water's case can be given and play certain insulation effect, eliminate the frequent switching phenomenon of heating and water heating function, promoted Unit combined reliability reduces Unit Commitment, to improve the service life of complete machine.
Detailed description of the invention
Fig. 1 is that the structure of the Hot water units of the embodiment of the Hot water units with constant-temperature hot water function and its control method is shown It is intended to;
In figure:
1, refrigerant heat exchanger recycles;2, water heat exchange cycle;3, water tank;4, heat exchanging pipe;41, the first heat exchanging pipe;42, Two heat exchanging pipes;51, the first triple valve;52, the second triple valve;6, heat exchanger;7, throttle mechanism.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, right with reference to the accompanying drawings and embodiments The present invention is further elaborated.It should be appreciated that described herein, the specific embodiments are only for explaining the present invention, not For limiting the present invention.
Hot water units as shown in Figure 1 are also wrapped including refrigerant heat exchanger circulation 1 and water heat exchange cycle 2 with heat exchange Water tank 3 is included, two sets of heat exchanging pipes 4 are provided in the water tank 3, and the both ends of a set of heat exchanging pipe 4 and the water exchange heat The both ends of 2 connection of circulation, another heat exchanging pipe 4 are connected to refrigerant heat exchanger circulation 1, can also be selected as needed Select refrigerant to the water in water tank 3 heated or selected water the water in water tank 3 is heated or is selected refrigerant and Water simultaneously heats the water in water tank 3, improves the effect of the water heating of Hot water units, meet to the water in water tank 3 into Unit Commitment is minimized when row heating, promotes the comfort of indoor heating, unit synthesis is improved and uses efficiency and service life.
The Hot water units further include on off mechanism, and the on-off machine is provided on each heat exchanging pipe 4 Structure, the on-off of corresponding heat exchanging pipe 4 is controlled using on off mechanism, to select refrigerant or water or enter in water tank 3 simultaneously It exchanges heat.
The heat exchanging pipe 4 includes the first heat exchanging pipe 41 and the second heat exchanging pipe 42, first heat exchanging pipe 41 with The water heat exchange cycle 2 is connected to, and second heat exchanging pipe 42 is connected to refrigerant heat exchanger circulation 1.
The on off mechanism is triple valve, and including the first triple valve 51 and the second triple valve 52, first triple valve 51 are set between first heat exchanging pipe 41 and the water heat exchange cycle 2, and the entrance of first triple valve 51 and institute The first outlet for stating the first triple valve 51 is connected to the water heat exchange cycle 2, the second outlet of first triple valve 51 with The heat exchanging pipe 4 is connected to, and second triple valve 52 is set to second heat exchanging pipe 42 and the refrigerant heat exchanger follows Between ring 1, and the first outlet of the entrance of second triple valve 52 and second triple valve 52 is changed with the refrigerant Thermal cycle 1 is connected to, and the second outlet of second triple valve 52 is connected to second heat exchanging pipe 42, that is to say, that on-off machine The end of heat exchanging pipe 4 is arranged in structure, is controlled using the on-off that the switching effect of triple valve can effectively exchange pipe line 4 System, effectively prevent indoor heating temperature fluctuation, promotes the comfort of indoor heating, and play insulation effect to domestic hot-water's case 3, So that user timely uses the hot water of target water temperature state, the economy and high-comfort operation of Hot water units are realized.
The Hot water units further include heat exchanger 6, and the refrigerant heat exchanger circulation 1 and the water heat exchange cycle 2 are described Heat exchange, water inlet and outflow heat exchanger 6 of the water heat exchange cycle 2 at heat exchanger 6 with inflow heat exchanger 6 are carried out in heat exchanger 6 Water outlet.
The refrigerant heat exchanger circulation 1 further includes throttle mechanism 7, and second triple valve 52 is set to the throttle mechanism Between 7 and the heat exchanger 6, and the first outlet of second triple valve 52 is connected to the throttle mechanism 7, and the described 2nd 3 The entrance of port valve 52 is connected to the heat exchanger 6, namely when being heated using refrigerant to the water in water tank 3 using process Refrigerant after heat exchanger 6 exchanges heat heats the water in water tank 3, to guarantee changing in water heat exchange cycle 2 as far as possible Heat.
The Hot water units further include compressor, four-way valve and outdoor heat exchanger, and compressor, four-way valve, heat exchanger, section Stream mechanism and outdoor heat exchanger are sequentially connected in series to form refrigerant heat exchanger circulation.
The first end of second heat exchanging pipe 42 is connected to the second outlet of second triple valve 52, second end and institute It states position between throttle mechanism 7 and the heat exchanger 6 to be connected to, flows back to refrigerant after heat exchange into the refrigerant in water tank 3 and change In thermal cycle 1, and the throttling action for again passing by throttle mechanism 7 carries out normal heat exchange cycle.
The Hot water units further include multiple heat exchange load, all heat exchange load in series or are arranged in parallel in the water On heat exchange cycle 2.
The heat exchange load includes fan coil and grounding heat coil tube, and the fan coil and the grounding heat coil tube are arranged in series In on the water heat exchange cycle 2.
The water outlet of the fan coil is connected to the water inlet of the grounding heat coil tube, and fan coil and floor heating are connected on Thermal temperature field can be provided for user's synthesis together, fan coil demand temperature is generally greater than floor heating, so wind disk is installed In front.
A kind of control method of above-mentioned Hot water units, the heat exchanging pipe 4 include the second heat exchanging pipe 42, described second Heat exchanging pipe 42 is connected to refrigerant heat exchanger circulation 1, and the control method includes:
S1, setting 3 target temperature Tw1 of water tank and 3 temperature deviation limiting value a, b of water tank (a > b);
Water temperature T w in S2, real-time detection water tank 3, and calculate 3 temperature difference △ T1=of water tank | Tw1-Tw |;
S3, compare △ T1 and a, b, and the second heat exchanging pipe 42 and refrigerant heat exchanger circulation 1 are adjusted according to comparison result On off operating mode.
In step s3 further include:
If △ T1 > a, make second heat exchanging pipe 42 with refrigerant heat exchanger circulation 1 in connected state, namely When needing a large amount of hot water or needing high-temperature hot water, heat refrigerant directly to the water in water tank 3, to meet The hot water of water tank 3 is supplied;
If a >=△ T1 > b, second heat exchanging pipe 42 and the on off operating mode of refrigerant heat exchanger circulation 1 are kept not Become, namely the heat exchange amount in water tank 3 at this time meets hot water demand;
If b >=△ T1, so that second heat exchanging pipe 42 is recycled 1 with the refrigerant heat exchanger and be in an off state, namely Hot water supply at this time meets, and the water in water tank 3 is exchanged heat or kept the temperature using the water in water heat exchange cycle 2.
The Hot water units include the second triple valve 52, and second triple valve 52 is set to second heat exchanging pipe 42 Between refrigerant heat exchanger circulation 1, and the entrance of second triple valve 52 and the first outlet with the refrigeration Agent heat exchange cycle 1 is connected to, and the second outlet of second triple valve 52 is connected to second heat exchanging pipe 42, in step s3 Further include:
If △ T1 > a, the entrance of second triple valve 52 are connected to the second outlet of second triple valve 52, namely When needing a large amount of hot water or needing high-temperature hot water, heat refrigerant directly to the water in water tank 3, to meet The hot water of water tank 3 is supplied;
If a >=△ T1 > b, keep the state of second triple valve 52 constant, namely the heat exchange amount in water tank 3 at this time Meet hot water demand;
If b >=△ T1, it is connected to the entrance of second triple valve 52 and the first outlet of second triple valve 52, I.e. hot water supply at this time meets, and the water in water tank 3 is exchanged heat or kept the temperature using the water in water heat exchange cycle 2.
The heat exchanging pipe 4 includes the first heat exchanging pipe 41, and first heat exchanging pipe 41 connects with the water heat exchange cycle 2 Logical, the Hot water units include heat exchanger 6, and the refrigerant heat exchanger circulation 1 and the water heat exchange cycle 2 are in the heat exchanger 6 Interior carry out heat exchange, the Hot water units further include multiple heat exchange load, all heat exchange load in series or be arranged in parallel in On the water heat exchange cycle 2, the control method further include:
S01, the leaving water temperature deviation limit value c for setting heat exchanger 6, load temperature difference limit value d and water heat exchange cycle 2 flow out The target leaving water temperature To1 of heat exchanger 6;
S02, the inflow temperature Ti of 2 inflow heat exchanger 6 of real-time detection water heat exchange cycle, 2 outflow heat exchanger 6 of water heat exchange cycle Leaving water temperature To, and calculate 6 temperature difference △ T3=To-Ti of temperature difference of outlet water △ T2=To1-To and heat exchanger;
S03, it is respectively compared △ T2 and c, △ T1 and a, b and △ T3 and d, and first heat exchange is adjusted according to comparison result The on off operating mode of pipeline 41 and water heat exchange cycle 2.
In step S03 further include:
If △ T2 > c and △ T1 > a, first heat exchanging pipe 41 are in an off state with water heat exchange cycle 2, at this time Two heat exchanging pipes 42 are connected to refrigerant heat exchanger circulation 1, are directly heated using refrigerant to the water in water tank 3, and are utilized Heat in water heat exchange cycle 2;
If △ T2 > c and a >=△ T1 > b, the on off operating mode of first heat exchanging pipe 41 and water heat exchange cycle 2 is constant, Namely current Hot water units meet the supply to hot water and heating simultaneously;
If △ T2 > c and △ T1≤b, first heat exchanging pipe 41 is in connected state with water heat exchange cycle 2, at this time Second heat exchanging pipe 42 is in an off state with refrigerant heat exchanger circulation 1, merely with the heat in water heat exchange cycle 2 to water tank 3 Interior water exchanges heat;
If △ T2≤c and △ T3 > d, first heat exchanging pipe 41 is in an off state with water heat exchange cycle 2 namely this When Hot water units heating needs it is big, make the heat exchange amount of water heat exchange cycle 2 be entirely used for heating;
If △ T2≤c and △ T3≤d, first heat exchanging pipe 41 and water heat exchange cycle 2 be in connected state namely this When Hot water units heating needs it is little, keep the temperature the heat exchange amount in water heat exchange cycle 2 to the water in water tank 3, guarantee heat Water supply.
The Hot water units further include the first triple valve 51, and first triple valve 51 is set to first heat exchanging pipe Between 41 and the water heat exchange cycle 2, and the entrance of first triple valve 51 and first outlet with the water heat exchange cycle 2 Connection, the second outlet of first triple valve 51 is connected to the heat exchanging pipe 4, in step S03 further include:
If △ T2 > c and △ T1 > a, the first outlet of the entrance of first triple valve 51 and first triple valve 51 Connection, the second heat exchanging pipe 42 is connected to refrigerant heat exchanger circulation 1 at this time, is directly carried out using refrigerant to the water in water tank 3 Heating, and heat using in water heat exchange cycle 2;
If △ T2 > c and a >=△ T1 > b, the Hot water units that the state of first triple valve 51 is constant namely current are same When meet supply to hot water and heating;
If △ T2 > c and △ T1≤b, the second outlet of the entrance of first triple valve 51 and first triple valve 51 Connection, the second heat exchanging pipe 42 at this time is in an off state with refrigerant heat exchanger circulation 1, merely in water heat exchange cycle 2 Heat exchanges heat to the water in water tank 3;
If △ T2≤c and △ T3 > d, the first outlet of the entrance of first triple valve 51 and first triple valve 51 Connection, namely the heating needs of Hot water units at this time are big, and the heat exchange amount of water heat exchange cycle 2 is made to be entirely used for heating;
If △ T2≤c and △ T3≤d, the second outlet of the entrance of first triple valve 51 and first triple valve 51 Connection, namely the heating needs of Hot water units at this time are little, carry out the heat exchange amount in water heat exchange cycle 2 to the water in water tank 3 Heat preservation guarantees hot water supply.
Before step S1 further include: judge the working condition of Hot water units:
If the Hot water units are in heating mode, continue step S2 and step S3;
If the Hot water units are in refrigeration mode, two sets of heat exchanging pipes 4 are in off-state.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously Limitations on the scope of the patent of the present invention therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention Protect range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.

Claims (17)

1. a kind of Hot water units, including refrigerant heat exchanger circulation (1) and water heat exchange cycle (2) with heat exchange, feature exists In: further include water tank (3), is provided with two sets of heat exchanging pipes (4), and the two of a set of heat exchanging pipe (4) in the water tank (3) End is connected to the water heat exchange cycle (2), and the both ends of another heat exchanging pipe (4) and refrigerant heat exchanger circulation (1) are even It is logical.
2. Hot water units according to claim 1, it is characterised in that: the Hot water units further include on off mechanism, each The on off mechanism is provided on the heat exchanging pipe (4).
3. Hot water units according to claim 2, it is characterised in that: the heat exchanging pipe (4) includes the first heat exchanging pipe (41) it is connected to the second heat exchanging pipe (42), first heat exchanging pipe (41) with the water heat exchange cycle (2), described second changes Pipe line (42) is connected to refrigerant heat exchanger circulation (1).
4. Hot water units according to claim 3, it is characterised in that: the on off mechanism is triple valve, and including first Triple valve (51) and the second triple valve (52), first triple valve (51) are set to first heat exchanging pipe (41) and described Between water heat exchange cycle (2), and the first outlet of the entrance of first triple valve (51) and first triple valve (51) is equal It is connected to the water heat exchange cycle (2), the second outlet of first triple valve (51) is connected to the heat exchanging pipe (4), institute It states the second triple valve (52) to be set between second heat exchanging pipe (42) and refrigerant heat exchanger circulation (1), and described The first outlet of the entrance of second triple valve (52) and second triple valve (52) connects with refrigerant heat exchanger circulation (1) Logical, the second outlet of second triple valve (52) is connected to second heat exchanging pipe (42).
5. Hot water units according to claim 4, it is characterised in that: the Hot water units further include heat exchanger (6), described Refrigerant heat exchanger recycles (1) and the water heat exchange cycle (2) and carries out heat exchange in the heat exchanger (6).
6. Hot water units according to claim 5, it is characterised in that: the refrigerant heat exchanger circulation (1) further includes throttling Mechanism (7), second triple valve (52) are set between the throttle mechanism (7) and the heat exchanger (6), and described second The first outlet of triple valve (52) is connected to the throttle mechanism (7), the entrance of second triple valve (52) and the heat exchange Device (6) connection.
7. Hot water units according to claim 6, it is characterised in that: the first end of second heat exchanging pipe (42) and institute State the second outlet connection of the second triple valve (52), position between second end and the throttle mechanism (7) and the heat exchanger (6) Connection.
8. Hot water units according to claim 1, it is characterised in that: the Hot water units further include multiple heat exchange loads, All heat exchange load in series are arranged in parallel on the water heat exchange cycle (2).
9. Hot water units according to claim 8, it is characterised in that: the heat exchange load includes fan coil and ground warming plate Pipe, the fan coil and the grounding heat coil tube are arranged in series on the water heat exchange cycle (2).
10. Hot water units according to claim 9, it is characterised in that: the water outlet of the fan coil and the floor heating The water inlet of coil pipe is connected to.
11. a kind of control method of Hot water units described in any one of claims 1 to 10, it is characterised in that: the heat exchange Pipeline (4) includes the second heat exchanging pipe (42), and second heat exchanging pipe (42) is connected to refrigerant heat exchanger circulation (1), The control method includes:
S1, setting water tank (3) target temperature Tw1 and water tank (3) temperature deviation limiting value a, b (a > b);
S2, the interior water temperature T w of real-time detection water tank (3), and calculate water tank (3) temperature difference △ T1=| Tw1-Tw |;
S3, compare △ T1 and a, b, and the second heat exchanging pipe (42) and refrigerant heat exchanger circulation (1) are adjusted according to comparison result On off operating mode.
12. control method according to claim 11, it is characterised in that: in step s3 further include:
If △ T1 > a, so that second heat exchanging pipe (42) and the refrigerant heat exchanger is recycled (1) and be in connected state;
If a >=△ T1 > b, the on off operating mode of second heat exchanging pipe (42) and refrigerant heat exchanger circulation (1) is kept not Become;
If b >=△ T1, so that second heat exchanging pipe (42) is recycled (1) with the refrigerant heat exchanger and be in an off state.
13. control method according to claim 11, it is characterised in that: the Hot water units include the second triple valve (52), second triple valve (52) is set between second heat exchanging pipe (42) and refrigerant heat exchanger circulation (1), And second triple valve (52) entrance and the first outlet be connected to refrigerant heat exchanger circulation (1), described the The second outlet of two triple valves (52) is connected to second heat exchanging pipe (42), in step s3 further include:
If △ T1 > a, the entrance of second triple valve (52) are connected to the second outlet of second triple valve (52);
If a >=△ T1 > b, keep the state of second triple valve (52) constant;
If b >=△ T1, it is connected to the entrance of second triple valve (52) and the first outlet of second triple valve (52).
14. control method according to claim 11, it is characterised in that: the heat exchanging pipe (4) includes the first heat exchanger tube Road (41), first heat exchanging pipe (41) are connected to the water heat exchange cycle (2), and the Hot water units include heat exchanger (6), The refrigerant heat exchanger circulation (1) and the water heat exchange cycle (2) carry out heat exchange, the hot water in the heat exchanger (6) Unit further includes multiple heat exchange load, all heat exchange load in series or is arranged in parallel on the water heat exchange cycle (2), institute State control method further include:
S01, the leaving water temperature deviation limit value c for setting heat exchanger (6), load temperature difference limit value d and water heat exchange cycle (2) outflow The target leaving water temperature To1 of heat exchanger (6);
S02, the inflow temperature Ti of real-time detection water heat exchange cycle (2) inflow heat exchanger (6), water heat exchange cycle (2) outflow heat exchange The leaving water temperature To of device (6), and calculate temperature difference of outlet water △ T2=To1-To and heat exchanger (6) temperature difference △ T3=To-Ti;
S03, it is respectively compared △ T2 and c, △ T1 and a, b and △ T3 and d, and first heat exchanging pipe is adjusted according to comparison result (41) with the on off operating mode of water heat exchange cycle (2).
15. control method according to claim 14, it is characterised in that: in step S03 further include:
If △ T2 > c and △ T1 > a, first heat exchanging pipe (41) are in an off state with water heat exchange cycle (2);
If △ T2 > c and a >=△ T1 > b, first heat exchanging pipe (41) and the on off operating mode of water heat exchange cycle (2) are constant;
If △ T2 > c and △ T1≤b, first heat exchanging pipe (41) and water heat exchange cycle (2) are in connected state;
If △ T2≤c and △ T3 > d, first heat exchanging pipe (41) are in an off state with water heat exchange cycle (2);
If △ T2≤c and △ T3≤d, first heat exchanging pipe (41) and water heat exchange cycle (2) are in connected state.
16. control method according to claim 14, it is characterised in that: the Hot water units further include the first triple valve (51), first triple valve (51) is set between first heat exchanging pipe (41) and the water heat exchange cycle (2), and institute The entrance and first outlet for stating the first triple valve (51) are connected to the water heat exchange cycle (2), first triple valve (51) Second outlet be connected to the heat exchanging pipe (4), in step S03 further include:
If △ T2 > c and △ T1 > a, the first outlet of the entrance of first triple valve (51) and first triple valve (51) Connection;
If △ T2 > c and a >=△ T1 > b, the state of first triple valve (51) are constant;
If △ T2 > c and △ T1≤b, the second outlet of the entrance of first triple valve (51) and first triple valve (51) Connection;
If △ T2≤c and △ T3 > d, the first outlet of the entrance of first triple valve (51) and first triple valve (51) Connection;
If △ T2≤c and △ T3≤d, the second outlet of the entrance of first triple valve (51) and first triple valve (51) Connection.
17. control method according to claim 11, it is characterised in that: before step S1 further include: judge hot water machine The working condition of group:
If the Hot water units are in heating mode, continue step S2 and step S3;
If the Hot water units are in refrigeration mode, two sets of heat exchanging pipes (4) are in off-state.
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