CN109357442A - Heat pump system and control method - Google Patents
Heat pump system and control method Download PDFInfo
- Publication number
- CN109357442A CN109357442A CN201811530399.9A CN201811530399A CN109357442A CN 109357442 A CN109357442 A CN 109357442A CN 201811530399 A CN201811530399 A CN 201811530399A CN 109357442 A CN109357442 A CN 109357442A
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- Prior art keywords
- branch
- antifreeze
- heat exchanger
- pump system
- heat pump
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/31—Low ambient temperatures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
The invention discloses a kind of heat pump system and control methods, are related to field of air conditioning, to optimize existing heat pump system.The heat pump system includes refrigerant circulation circuit, thermal water utilization circuit and antifreeze branch.Refrigerant circulation circuit includes the first branch of heat exchanger；Thermal water utilization circuit includes the second branch of heat exchanger；Antifreeze branch is configured to form antifreeze circuit with the second branch of heat exchanger.Above-mentioned technical proposal, antifreeze branch and second branch switch forming antifreeze circuit and do not formed between antifreeze circuit two states.When that the blocking of thermal water utilization loop inner, can not form fluidic circuit, antifreeze branch plays the role of short-circuit blocking portion, and the second branch of antifreeze branch and heat exchanger forms antifreeze circuit, so that heat pump system works normally.
Description
Technical field
The present invention relates to field of air conditioning, and in particular to a kind of heat pump system and control method.
Background technique
Currently, heat-pump hot-water unit, in northern severe cold use in winter, water route is equipped with antifreezing measures, prevent water from freezing to cause
The pipeline spalling of water system damages.There may be the position of minimum temperature point outside set heat exchange device inlet and outlet pipes and unit,
Temperature sensor is set.When temperature sensor detects the temperature of pipeline lower than certain temperature, water pump and compressor start heating
Operation, with the water inside heating system.
Inventors have found that since improper etc. ask is constructed or is safeguarded in existing for water return pipeline or water system end for user
Topic, the position that temperature sensor is arranged not is the minimum temperature point of entire water system.If unit is opened into antifreeze operation
Before dynamic, water route actual minimum temperature point position has been freezed, and causes water line block, and generator protection shutdown is unable to run.If place
Reason not in time, will cause unit internal exchanger and water pump is freezing.
At present this field urgent need to resolve heat-pump hot-water unit in winter normal antifreeze function fail when, how anti-water-stopping system
It is further freezing.
Summary of the invention
The present invention proposes a kind of heat pump system and control method, to optimize heat pump system.
The present invention provides a kind of heat pump system, comprising:
Refrigerant circulation circuit, the first branch including heat exchanger；
Thermal water utilization circuit, the second branch including the heat exchanger；And
Antifreeze branch is configured to form antifreeze circuit with the second branch of the heat exchanger.
In some embodiments, the antifreeze branch is equipped with switching valve, and the switching valve is for existing the antifreeze branch
Switch between off state and on state.
In some embodiments, the thermal water utilization circuit further include:
First temperature sensor, set on the inflow entrance of the second branch；And/or
Second temperature sensor, set on the outflux of the second branch；
Wherein, the switching valve is configured as according to first temperature sensor and/or the second temperature sensor
The temperature value switching valve position detected, with antifreeze branch described on or off.
In some embodiments, heat pump system further include:
Water flow amount detector, set on the inflow entrance of the second branch；
Wherein, the switching valve is configured as the flow switching valve position detected according to the water flow amount detector, to lead
Lead to or end the antifreeze branch.
In some embodiments, heat pump system further include:
Controller is electrically connected with first temperature sensor and/or the second temperature sensor, and the controller is used
The refrigerant circulation is controlled in the temperature value detected according to first temperature sensor and/or the second temperature sensor
Whether the compressor in circuit starts.
In some embodiments, the thermal water utilization circuit further includes water flow amount detector, and the antifreeze branch is equipped with and cuts
Change valve；The controller is also electrically connected with the water flow amount detector and the switching valve；The controller is used in the water
When the water flow that flow detector detects is lower than setting value, controls the switching valve and the antifreeze branch is connected.
In some embodiments, heat pump system further include:
Water pump, set on the inflow entrance of the second branch.
In some embodiments, heat pump system further includes control assembly, and the control assembly includes:
Determining module is detected, is configured as in the case where heat pump system is in standby mode, according to the second of the heat exchanger
Temperature in road judges whether to meet preset antifreeze entry condition；
First judgment module is configured as after meeting antifreeze entry condition, judges the water flow of the heat exchanger inflow entrance
Whether amount meets setting value；And
Antifreeze processing module starts heat if the water flow for being configured as the heat exchanger inflow entrance meets setting value
Pumping system and make thermal water utilization loop works；If the water flow of the heat exchanger inflow entrance is unsatisfactory for setting value, start
Heat pump system and make antifreeze loop works.
In some embodiments, the control assembly further include:
Second judgment module, the temperature being configured as in the second branch according to the heat exchanger judge whether to meet default
Antifreeze exit criteria；If meeting antifreeze exit criteria, closing heat pump unit and restoring standby mode；If met antifreeze
Exit criteria, the then antifreeze operating status for keeping heat pump unit current.
Another embodiment of the present invention provides a kind of heat pump system control methods, comprising the following steps:
Under the first anti-freezing pattern, the second branch of heat exchanger in antifreeze branch and thermal water utilization circuit is formed antifreeze time
Road；
Start the compressor in refrigerant circulation circuit, it will be in the heat exchanger first branch described in the refrigerant circulation circuit
Fluid and the thermal water utilization circuit described in fluid heat transfer in heat exchanger second branch.
In some embodiments, first anti-freezing pattern at least meets one of following two groups of conditions: the heat exchanger
The temperature of second branch inflow entrance is lower than setting value lower than the fluid flow in threshold value and the second branch of the heat exchanger；Institute
The temperature for stating the second branch outflux of heat exchanger is lower than lower than the fluid flow in threshold value and the second branch of the heat exchanger
Setting value.
In some embodiments, under first anti-freezing pattern, the frequency of the compressor is not higher than setpoint frequency, institute
Setpoint frequency is stated lower than highest frequency.
In some embodiments, heat pump system control method is further comprising the steps of:
Under the second anti-freezing pattern, antifreeze branch is disconnected；
Start the compressor in refrigerant circulation circuit, it will be in the heat exchanger first branch described in the refrigerant circulation circuit
Fluid and the thermal water utilization circuit described in fluid heat transfer in heat exchanger second branch.
In some embodiments, second anti-freezing pattern at least meets one of following two groups of conditions: the heat exchanger
The temperature of second branch inflow entrance is not less than setting value lower than the fluid flow in threshold value and the second branch of the heat exchanger；
The temperature of the second branch outflux of the heat exchanger is not lower than the fluid flow in threshold value and the second branch of the heat exchanger
Lower than setting value.
In some embodiments, under second anti-freezing pattern, the frequency of the compressor is not higher than highest frequency.
Above-mentioned technical proposal, antifreeze branch and second branch are forming antifreeze circuit and are not forming two kinds of antifreeze circuit shape
Switch between state.When that the blocking of thermal water utilization loop inner, can not form fluidic circuit, antifreeze branch plays short-circuit blocking
The second branch of partial effect, antifreeze branch and heat exchanger forms antifreeze circuit, so that heat pump system works normally.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes part of this application, this hair
Bright illustrative embodiments and their description are used to explain the present invention, and are not constituted improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the heat pump system structural schematic diagram that one embodiment of the invention provides；
Control assembly structural schematic diagram in the heat pump system that Fig. 2 provides for one embodiment of the invention；
Fig. 3 be another embodiment of the present invention provides heat pump system control method flow diagram.
Specific embodiment
Technical solution provided by the invention is illustrated in more detail below with reference to FIG. 1 to FIG. 3.
Referring to Fig. 1, the present invention provides a kind of heat pump system, including refrigerant circulation circuit 1, thermal water utilization circuit 2 and anti-
Freeze branch 3.Refrigerant circulation circuit 1 includes the first branch 41 of heat exchanger 4；Thermal water utilization circuit 2 includes second of heat exchanger 4
Road 42.Antifreeze branch 3 is configured to form antifreeze circuit with the second branch 42 of heat exchanger 4.
Refrigerant circulation circuit 1 employed in some embodiments is described below.
Referring to Fig. 1, refrigerant circulation circuit 1 is swollen including compressor 11, the first branch 41 of heat exchanger 4, filter 12, electronics
Swollen valve 13, evaporator 14, gas-liquid separator 15.
The high temperature refrigerant that compressor 11 exports enters the first branch 41 of heat exchanger 4.In the first branch 41 of heat exchanger 4
Refrigerant and in the second branch 42 of heat exchanger 4 water heat exchange after cool down, then refrigerant flows to filter 12, electric expansion valve
13, evaporator 14, gas-liquid separator 15, finally flow back to compressor 11.
Referring to Fig. 1, in some embodiments, refrigerant circulation circuit 1 is equipped with the first temperature detecting element 16, to detect gas-liquid
The air entry temperature of separator 15.Refrigerant circulation circuit 1 is equipped with second temperature detecting element 19, to detect 11 exhaust outlet of compressor
Temperature.
Referring to Fig. 1, in some embodiments, 11 exhaust outlet of compressor is equipped with high-voltage switch gear 17.Gas-liquid separator 15 goes out
Port is equipped with low tension switch 18.
Thermal water utilization circuit 2 employed in some embodiments is described below.
Referring to Fig. 1, thermal water utilization circuit 2 includes the second branch 42 of heat exchanger 4, and water enters in second branch 42, with
Refrigerant heat exchange in the first branch 41 of heat exchanger 4 then flows out second branch 42, and needs to make by the outer feed water inlet supply of machine
With the equipment of hot water.Cold water is back in second branch 42 by the outer water return outlet of machine.
Referring to Fig. 1,42 shape of second branch of antifreeze branch 3 and heat exchanger 4 employed in some embodiments is described below
At antifreeze circuit.
Antifreeze circuit is formed according to demand, and when needing antifreeze using antifreeze circuit heat exchanging device 4, antifreeze branch 3 is connected,
So that the second branch 42 of antifreeze branch 3 and heat exchanger 4 forms antifreeze circuit.The end positions of the antifreeze branch 3, which compare, to be leaned on
The both ends of the second branch 42 of nearly heat exchanger 4.Therefore certain components appearance are freezing or because of other originals in thermal water utilization circuit 2
Because causing the farther away parts damages of second branch 42 in thermal water utilization circuit 2 apart from heat exchanger 42 nothing of thermal water utilization circuit occur
When method makes fluid circulation, realize that heat exchanger 4 is antifreeze using antifreeze circuit.
Referring to Fig. 1, in some embodiments, antifreeze branch 3 is equipped with switching valve 31, and switching valve 31 is used for antifreeze branch 3
Switch between off state and on state.
Switching valve 31 such as uses solenoid valve, to realize the automatic control of its valve position.
Referring to Fig. 1, in some embodiments, thermal water utilization circuit 2 further includes the first temperature sensor 21 and/or the second temperature
Spend sensor 22.First temperature sensor 21 is set to the inflow entrance of second branch 42.Second temperature sensor 22 is set to second
The outflux on road 42.Wherein, switching valve 31 is configured as being examined according to the first temperature sensor 21 and/or second temperature sensor 22
The temperature value switching valve position measured, with the antifreeze branch 3 of on or off.
First temperature sensor 21, second temperature sensor 22 also are located in antifreeze circuit.
The temperature value that first temperature sensor 21, second temperature sensor 22 detect such as only uses one of them, or
The temperature value that two sensor measurements of person obtain all uses.There are many specific control strategies, introduces following several specific sides herein
Formula realizes the temperature value that switching valve 31 is obtained according to detection, controls its valve position: directly according to the temperature duty control valve detected
Switching valve 31 is directly connected lower than 0 DEG C in position, such as the temperature value detected, and opens heat pump unit, to realize that heat exchanger 4 is anti-
Freeze.Or according to the temperature value detected in a period of time, judge whether thermal water utilization circuit 2 is conducting.If when setting
In length, the temperature value detected is consistently higher than setting value, then judges that thermal water utilization circuit 2 is in and do not turn on state, switch at this time
The valve position of valve 31 is also switched on state, so that antifreeze circuit is connected, to realize that heat exchanger 4 is antifreeze.
Referring to Fig. 1, in some embodiments, thermal water utilization circuit 2 further includes water flow amount detector 5, water flow amount detector 5
Set on the inflow entrance of second branch 42.Wherein, switching valve 31 is configured as the flow detected according to water flow amount detector 5 switching
Valve position, with the antifreeze branch 3 of on or off.
Using water flow amount detector 5, directly, easily judge that whether it is in a conductive state in thermal water utilization circuit 2.If
Water flow amount detector 5 detects obtained water flow and is less than setting value, then judges that thermal water utilization circuit 2 is blocking.Under this state
Need to be connected antifreeze circuit.If water flow amount detector 5 detects obtained water flow and is greater than the set value, judge that thermal water utilization returns
Road 2 is conducting, and it is antifreeze that heat exchanger 4 directly can be realized using thermal water utilization circuit 2.
As it can be seen that above-mentioned technical proposal, no matter whether thermal water utilization circuit 2 is connected, and it is antifreeze that heat exchanger 4 can be achieved.
In some embodiments, heat pump system further includes controller (not shown go out), controller and the first temperature sensor
21 and/or second temperature sensor 22 be electrically connected, controller is used to be sensed according to the first temperature sensor 21 and/or second temperature
Whether the compressor 11 for the temperature value control refrigerant circulation circuit 1 that device 22 detects starts.
After compressor 11 starts, refrigerant circulation circuit 1 is started to work.Under this state, thermal water utilization circuit 2 forms circulation,
Or antifreeze circuit forms circulation.
Referring to Fig. 1, in some embodiments, thermal water utilization circuit 2 further includes water flow amount detector 5, and antifreeze branch 3 is equipped with
Switching valve 31；Controller is also electrically connected with water flow amount detector 5 and switching valve 31；Controller is used to examine in water flow amount detector 5
When the water flow measured is lower than setting value, antifreeze branch 3 is connected in control switching valve 31.
The flow that controller is detected according to water flow amount detector 5, the valve position of automatic control switch valve 31.Water flow detection
When the flow that device 5 detects is less than setting value, antifreeze branch 3 is connected, forms antifreeze circuit.What water flow amount detector 5 detected
When flow is not less than setting value, antifreeze branch 3 is in off state, does not form antifreeze circuit, the normal work in thermal water utilization circuit 2
Make.Above-mentioned technical proposal improves the degree of automation of control.
Referring to Fig. 1, in some embodiments, heat pump system further includes water pump 6, and water pump 6 is set to the inflow of second branch 42
Mouthful.
Water pump 6 is located in antifreeze circuit, also is located in thermal water utilization circuit 2.Water is pumped into the of heat exchanger 4 by water pump 6
Two branches 42.It is antifreeze to also achieve water pump 6 while realizing that heat exchanger 4 is antifreeze for above-mentioned set-up mode.
Referring to Fig. 1 and Fig. 2, heat pump system further includes control assembly 7, and control assembly 7 includes detection determining module 71, first
Judgment module 72 and antifreeze processing module 73.
Detection determining module 71 is configured as: in the case where heat pump system is in standby mode, according to the second branch of heat exchanger 4
Temperature in 42 judges whether to meet preset antifreeze entry condition.
Antifreeze entry condition refers to that unit is in the standby state, since the temperature in the second branch 42 of heat exchanger 4 is low
In preset value, therefore pretrigger anti-freezing pattern.After anti-freezing pattern starting, refrigerant circulation circuit 1 is worked normally.Thermal water utilization circuit 2
Or a job is selected in antifreeze circuit.
First judgment module 72 is configured as: after meeting antifreeze entry condition, judging the water flow of 4 inflow entrance of heat exchanger
Whether setting value is met.
Antifreeze processing module 73 is configured as: if the water flow of 4 second branch of heat exchanger, 42 inflow entrance meets setting value,
Then start heat pump system and thermal water utilization circuit 2 is worked；If the water flow of 4 inflow entrance of heat exchanger is unsatisfactory for setting value,
Then start heat pump system and makes antifreeze loop works.
Whether above-mentioned antifreeze processing module 73 meets setting according to the water flow of 4 second branch of heat exchanger, 42 inflow entrance
Which kind of antifreeze circulation value, judgement specifically use.Specifically, if the water flow of 4 second branch of heat exchanger, 42 inflow entrance meets
It is required that then being worked using thermal water utilization circuit 2；If the water flow of 4 second branch of heat exchanger, 42 inflow entrance is unsatisfactory for requiring,
Using antifreeze loop works.
In some embodiments, control assembly 7 further includes the second judgment module 74.Second judgment module 74 is configured as root
Judge whether to meet preset antifreeze exit criteria according to the temperature in the second branch 42 of heat exchanger 4.If meeting antifreeze exit
Condition then closes heat pump unit and restores the standby mode of heat pump unit；If meeting antifreeze exit criteria, heat pump machine is kept
The current antifreeze operating status of group.
As shown in Fig. 2, in some embodiments, control system includes detection determining module 71, first judgment module 72, prevents
Freeze processing module 73 and the second judgment module 74.
Detection determining module 71 is configured as: in stand-by mode, passing through the outflux of heat exchanger 4 or the water temperature of outflux
Detect the temperature of 4 second branch of heat exchanger, 42 internal water.According to testing result, determine whether the inlet and outlet temperature of heat exchanger 4 is full
The preset antifreeze entry condition of foot.
First judgment module 72 is configured as: being preset when the inlet and outlet temperature for the second branch 42 for determining heat exchanger 4 meets
Antifreeze condition when, open water pump 6 after judge water flow amount detector 5 such as water flow protective switch whether in an ON state.
If water flow amount detector 5 is in an ON state, compressor 11 is opened, directly to carry out antifreeze operation.If water flow is examined
It surveys device 5 and is not on on-state, then electrical ball valve and compressor 11 are opened, to carry out antifreeze operation.
Antifreeze processing module 73 is configured as: if water flow amount detector 5 is in an ON state, directly unlatching unit is anti-
Freeze operation, compressor 11 freely adjusts the highest frequency operation risen under conditions present.If water flow amount detector 5 is not on
On-state, then open electrical ball valve, is then then turned on the antifreeze operation of unit, compressor 11 is freely adjusted but no more than institute is pre-
If a certain frequency values (i.e. setpoint frequency), keep low-frequency operation.
Second judgment module 74 is configured as: the temperature of the Inlet and outlet water of the second branch 42 of real-time detection heat exchanger 4, judgement
Whether the temperature of intake-outlet meets preset antifreeze exit criteria.If meet preset antifreeze exit criteria, close
Unit restores standby mode.If the temperature of 4 Inlet and outlet water of heat exchanger is unsatisfactory for antifreeze exit criteria, current antifreeze operation is kept
State.
Some specific embodiments are described below.
As shown in Figure 1, the refrigerant circulation circuit 1 (also known as host) of the heat pump system includes frequency-changeable compressor 11, evaporation
The components such as device 14, electric expansion valve 13.Thermal water utilization circuit 2 includes heat exchanger 4, water pump 6, (such as the water flow of water flow amount detector 5
Switch) etc. components.The outer water return outlet of machine and the outer feed water inlet of machine use end cooling fin, floor heating pipe, the blower of water pipe and user's family
The connection of the equipment such as coil pipe or water storage hot tank makes water circulate through heat exchanger 4 by water pump 6, realizes cold water, supply heat
Water.
Working medium in recirculated water and host system in 4 second branch 42 of heat exchanger in the first branch 41 of heat exchanger 4 is changed
It after heat, is supplied water by feed water inlet outside machine to end, external recirculated water is reentered inside heat exchanger 4 by the outer water return outlet of machine to be added
Heat.The outflux of heat exchanger 4 is equipped with second temperature sensor 22, to detect leaving water temperature.The inflow entrance of heat exchanger 4 is equipped with first
Temperature sensor 21, to detect inflow temperature.The inflow entrance of heat exchanger 4 is additionally provided with water pump 6 and water flow detection switch.In water return outlet
Pipeline is set between feed water inlet, as antifreeze branch 3.Switching valve 31 is equipped in pipeline, switching valve 31 is such as electrical ball valve.
Heat pump system is specifically controlled using following control strategies.When unit works normally, electrical ball valve is not turned on, not shadow
Heat pump unit is rung to work normally.When heat pump unit starts antifreeze operation, and occur water flow it is too low when, electrical ball valve is opened.This
When 4 inflow entrance of heat exchanger and outflux formed be shorted effect.After short circuit, the water flow detection in antifreeze circuit is normal, and heat pump unit is opened
Heating is opened, with the water in the second branch 42 of heating heat exchanger 4, reaches antifreezing effect, to prevent heat-pump hot-water unit because of outside
When water line block can not be normal antifreeze, unit internal watercourses and heat exchanger 4 further freeze and cause more to lose.
As shown in figure 3, detection judges the inflow temperature of heat exchanger 4 and/or leaving water temperature is when unit is in standby
It is no to be less than or equal to antifreeze operation preset value.If inflow temperature and/or leaving water temperature are higher than antifreeze operation preset value, keep
Current state.If inflow temperature and/or leaving water temperature are below or equal to antifreeze operation preset value, heat pump unit starting is anti-
Freeze operation.
Into after antifreeze operation, water pump 6 is first turned on, within a preset time period water flow amount detector (specifically such as water
Stream switch) 5 persistently detection water flow it is whether normal.If normal, then start compressor 11,11 high frequency of compressor is run rapidly to water body
It is heated.Until detection judges that inflow and outflow temperature more than or equal to antifreeze operation, is then log out preset value, closes compression
Machine 11, water pump 6 etc., heat pump unit exits antifreeze operation.
If water flow switch judges water system exception, that is, there is the case where external water line block, then open electrical ball valve, in machine
The internal connection water return outlet of group and feed water inlet, unit internal watercourses have been able to be formed into a loop, and water pump 6 and water flow switch can be normal
Work.At this moment open compressor 11 and keep low-frequency operation, the water inside circulating-heating heat exchanger 4, until detection judgement water inlet with
Leaving water temperature is greater than or equal to antifreeze operation and exits preset value, then components, the heat pump unit such as close compressor 11, water pump 6 exit
Antifreeze operation.
Heat pump unit judge water flow switch exception, and enter open electrical ball valve it is antifreeze during, to outside send therefore
Hinder signal, prompts the antifreeze process exception in thermal water utilization circuit 2, need to examine dimension.
Referring to Fig. 3, the embodiment of the present invention also provides a kind of heat pump system control method, for example uses any of the above-described implementation
The heat pump system that example provides is realized.Method includes the following steps:
Step 1: under the first anti-freezing pattern, by the second branch of heat exchanger 4 in antifreeze branch 3 and thermal water utilization circuit 2
42 form antifreeze circuit.
In some embodiments, antifreeze branch 3 is connected, in addition to following switching valve 31 on antifreeze branch 3, without other
Component forms short circuit similar to using antifreeze branch 3.
Step 2: the compressor 11 in starting refrigerant circulation circuit 1, by 4 first, heat exchanger in refrigerant circulation circuit 1
Fluid heat transfer in fluid and thermal water utilization circuit 2 in road 41 in 4 second branch 42 of heat exchanger.
Above-mentioned technical proposal is blocked up in thermal water utilization circuit 2 apart from the farther away component of 4 second branch of heat exchanger 42
When filling in, damaging and cause thermal water utilization circuit 2 that can not work, the effect for preventing heat exchanger 4 freezing is played in antifreeze circuit.
In some embodiments, the first anti-freezing pattern at least meets one of following two groups of conditions.First group of condition are as follows: heat exchange
The temperature of 42 inflow entrance of second branch of device 4 is lower than the fluid flow in threshold value and the second branch 42 of heat exchanger 4 lower than setting
Value.Second group of condition are as follows: the temperature of 42 outflux of second branch of heat exchanger 4 is lower than threshold value and the second branch 42 of heat exchanger 4
In fluid flow be lower than setting value.
It is understood that in some embodiments, utilizing the inflow of the first temperature sensor 21 detection second branch 42
The temperature of mouth；The temperature of the outflux of second branch 42 is detected using second temperature sensor 22.
In some embodiments, under the first anti-freezing pattern, the frequency of compressor 11 is not higher than setpoint frequency, setpoint frequency
Lower than highest frequency.
Setpoint frequency is such as the 1/2~1/10 of highest frequency, for example is 1/2,1/3,1/5,1/10.
In some embodiments, heat pump system control method is further comprising the steps of:
Step 3: antifreeze branch 3 is disconnected under the second anti-freezing pattern.
After antifreeze branch 3 disconnects, antifreeze circuit will not be re-formed, i.e. the first anti-freezing pattern does not start.It is now in
Two anti-freezing patterns, thermal water utilization circuit 2 work normally.
Step 4: the compressor 11 in starting refrigerant circulation circuit 1, by 4 first, heat exchanger in refrigerant circulation circuit 1
Fluid heat transfer in fluid and thermal water utilization circuit 2 in road 41 in 4 second branch 42 of heat exchanger.
Thermal water utilization circuit 2 is in running order, and it is antifreeze to also achieve heat exchanger 4.
In some embodiments, the second anti-freezing pattern at least meets one of following two groups of conditions.First group of condition are as follows: heat exchange
The temperature of 42 inflow entrance of second branch of device 4 is not less than lower than the fluid flow in threshold value and the second branch 42 of heat exchanger 4 to be set
Definite value.Second group of condition are as follows: the temperature of 42 outflux of second branch of heat exchanger 4 is lower than threshold value and the second branch of heat exchanger 4
Fluid flow in 42 is not less than setting value.
In some embodiments, under the second anti-freezing pattern, the frequency of compressor 11 is not higher than highest frequency.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", "front", "rear",
The orientation or positional relationship of the instructions such as "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is based on attached drawing institute
The orientation or positional relationship shown is only the present invention and simplified description for ease of description, rather than indicates or imply signified device
Or element must have a particular orientation, construct and operate for specific orientation, thus should not be understood as in present invention protection
The limitation of appearance.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features,
But these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (15)
1. a kind of heat pump system characterized by comprising
Refrigerant circulation circuit (1), the first branch (41) including heat exchanger (4)；
Thermal water utilization circuit (2), the second branch (42) including the heat exchanger (4)；And
Antifreeze branch (3) is configured to form antifreeze circuit with the second branch (42) of the heat exchanger (4).
2. heat pump system according to claim 1, which is characterized in that the antifreeze branch (3) is equipped with switching valve (31), institute
Switching valve (31) are stated for switching the antifreeze branch (3) between off state and on state.
3. heat pump system according to claim 2, which is characterized in that the thermal water utilization circuit (2) further include:
First temperature sensor (21) is set to the inflow entrance of the second branch (42)；And/or
Second temperature sensor (22) is set to the outflux of the second branch (42)；
Wherein, the switching valve (31) is configured as being passed according to first temperature sensor (21) and/or the second temperature
The temperature value switching valve position that sensor (22) detects, with antifreeze branch (3) described on or off.
4. heat pump system according to claim 2, which is characterized in that further include:
Water flow amount detector (5) is set to the inflow entrance of the second branch (42)；
Wherein, the switching valve (31) is configured as the flow switching valve position detected according to the water flow amount detector (5), with
Antifreeze branch (3) described on or off.
5. heat pump system according to claim 2, which is characterized in that further include:
Controller is electrically connected, the control with first temperature sensor (21) and/or the second temperature sensor (22)
The temperature value that device is used to be detected according to first temperature sensor (21) and/or the second temperature sensor (22) controls
Whether the compressor (11) of the refrigerant circulation circuit (1) starts.
6. heat pump system according to claim 5, which is characterized in that the thermal water utilization circuit (2) further includes water flow
Detector (5), the antifreeze branch (3) are equipped with switching valve (31)；The controller also with the water flow amount detector (5) and institute
State switching valve (31) electrical connection；The water flow that the controller is used to detect in the water flow amount detector (5) is lower than setting
When value, controls the switching valve (31) and the antifreeze branch (3) is connected.
7. heat pump system according to claim 1, which is characterized in that further include:
Water pump (6) is set to the inflow entrance of the second branch (42).
8. heat pump system according to claim 1, which is characterized in that further include control assembly (7), the control assembly
(7) include:
It detects determining module (71), is configured as in the case where heat pump system is in standby mode, according to the second of the heat exchanger (4)
Temperature in branch (42) judges whether to meet preset antifreeze entry condition；
First judgment module (72), is configured as after meeting antifreeze entry condition, judges the water of the heat exchanger (4) inflow entrance
Whether flow meets setting value；And
Antifreeze processing module (73) starts if the water flow for being configured as the heat exchanger (4) inflow entrance meets setting value
Heat pump system and make thermal water utilization circuit (2) work；If the water flow of heat exchanger (4) inflow entrance is unsatisfactory for setting
Value, then start heat pump system and make antifreeze loop works.
9. heat pump system according to claim 8, which is characterized in that the control assembly (7) further include:
Second judgment module (74), the temperature being configured as in the second branch (42) according to the heat exchanger (4) judge whether
Meet preset antifreeze exit criteria；If meeting antifreeze exit criteria, closing heat pump unit and restoring standby mode；If
Meet antifreeze exit criteria, then the antifreeze operating status for keeping heat pump unit current.
10. a kind of heat pump system control method, which comprises the following steps:
Under the first anti-freezing pattern, the second branch of heat exchanger in antifreeze branch and thermal water utilization circuit is formed into antifreeze circuit；
Start the compressor in refrigerant circulation circuit, by the stream in the heat exchanger first branch described in the refrigerant circulation circuit
Fluid heat transfer in heat exchanger second branch described in body and the thermal water utilization circuit.
11. heat pump system control method according to claim 10, which is characterized in that first anti-freezing pattern is at least full
Be enough one of lower two groups of conditions: the temperature of the second branch inflow entrance of the heat exchanger lower than threshold value and the heat exchanger the
Fluid flow in two branches is lower than setting value；The temperature of the second branch outflux of the heat exchanger is lower than threshold value and described
Fluid flow in the second branch of heat exchanger is lower than setting value.
12. heat pump system control method according to claim 10, which is characterized in that under first anti-freezing pattern,
The frequency of the compressor is not higher than setpoint frequency, and the setpoint frequency is lower than highest frequency.
13. heat pump system control method according to claim 10, which is characterized in that further comprising the steps of:
Under the second anti-freezing pattern, antifreeze branch is disconnected；
Start the compressor in refrigerant circulation circuit, by the stream in the heat exchanger first branch described in the refrigerant circulation circuit
Fluid heat transfer in heat exchanger second branch described in body and the thermal water utilization circuit.
14. heat pump system control method according to claim 13, which is characterized in that second anti-freezing pattern is at least full
Be enough one of lower two groups of conditions: the temperature of the second branch inflow entrance of the heat exchanger lower than threshold value and the heat exchanger the
Fluid flow in two branches is not less than setting value；The temperature of the second branch outflux of the heat exchanger is lower than threshold value and institute
The fluid flow in the second branch of heat exchanger is stated not less than setting value.
15. heat pump system control method according to claim 10, which is characterized in that under second anti-freezing pattern,
The frequency of the compressor is not higher than highest frequency.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811530399.9A CN109357442A (en) | 2018-12-14 | 2018-12-14 | Heat pump system and control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811530399.9A CN109357442A (en) | 2018-12-14 | 2018-12-14 | Heat pump system and control method |
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| CN109357442A true CN109357442A (en) | 2019-02-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811530399.9A Pending CN109357442A (en) | 2018-12-14 | 2018-12-14 | Heat pump system and control method |
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| CN110068168A (en) * | 2019-04-18 | 2019-07-30 | 东莞市哈唯新能源科技有限公司 | A kind of depth winterization system under air cooling module machine water circulation unit fault condition |
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| CN112460695A (en) * | 2020-11-19 | 2021-03-09 | 珠海格力电器股份有限公司 | Water circulation power module, anti-freezing control method thereof and air conditioning unit |
| CN112460739A (en) * | 2020-11-19 | 2021-03-09 | 珠海格力电器股份有限公司 | Anti-freezing device and control method thereof, heat pump unit and air conditioner |
| CN113156882A (en) * | 2021-04-15 | 2021-07-23 | 北京首农畜牧发展有限公司 | Automatic sewage back flushing control device and method based on PLC control |
| CN113623889A (en) * | 2021-07-30 | 2021-11-09 | 青岛海尔空调电子有限公司 | Control method for air source heat pump unit |
| CN114484281A (en) * | 2022-01-27 | 2022-05-13 | 江苏格陵兰传热科技有限公司 | Anti-freezing module for circulating pipeline |
| CN114992778A (en) * | 2022-05-23 | 2022-09-02 | 青岛海尔空调电子有限公司 | Anti-freezing control method of air conditioning unit |
| CN114992909A (en) * | 2021-03-02 | 2022-09-02 | 广东美的暖通设备有限公司 | Control method of heat pump system and heat pump system |
| CN117490280A (en) * | 2023-12-28 | 2024-02-02 | 珠海格力电器股份有限公司 | Anti-freezing control method and device for heat pump unit and heat pump unit |
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