CN109386966A

CN109386966A - Defrosting control method, device, storage medium and the heat pump unit of heat pump unit

Info

Publication number: CN109386966A
Application number: CN201811108112.3A
Authority: CN
Inventors: 卓明胜; 孟红武; 谷月明; 袁占彪; 胡乾龙
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2018-09-21
Filing date: 2018-09-21
Publication date: 2019-02-26
Also published as: WO2020056956A1

Abstract

The invention discloses a kind of defrosting control method of heat pump unit, device, storage medium and heat pump units, this method comprises: obtaining the outdoor environment temperature and operating status of the heat pump unit；Determine whether the outdoor environment temperature is greater than or equal to the lower limit of the first set temperature range；If the outdoor environment temperature is less than the lower limit of the first set temperature range, then determine whether the heat pump unit meets the defrost condition of setting according to the outdoor environment temperature and the operating status, to control the defrost process that the heat pump unit enters setting in the case where the heat pump unit meets the defrost condition.The solution of the present invention can solve the problem of entrance defrost condition unreasonable when carrying out defrost to outdoor unit fin leads to defrost poor reliability, achieve the effect that promote defrost reliability.

Description

Defrosting control method, device, storage medium and the heat pump unit of heat pump unit

Technical field

The invention belongs to source pump technology fields, and in particular to a kind of defrosting control method of heat pump unit, is deposited device Storage media and heat pump unit more particularly to the heat pump water dispenser unit defrosting control method and this method pair of a kind of judgement of multi-parameter The device answered, the heat pump unit with the device, the computer readable storage medium for being stored with the corresponding instruction of this method and It is able to carry out the heat pump unit of the corresponding instruction of this method.

Background technique

When heat pump water-heating machine is heated in winter, since it is desired that absorbing heat from low temperature environment, low evaporating temperature is general All over lower, it will lead to the moisture in outdoor air in this way and frost to the cold be attached to outdoor heat exchanger surface, increase outdoor heat exchange The thermal resistance of device causes unit heating capacity to be deteriorated, influences unit heating capacity efficiency, needing at this time in time will be on outdoor unit fin Frost melt.But the entry condition of defrost is affected to the heating capacity efficiency of unit, unreasonable defrost condition causes Unit is frostless in winter also to enter defrost or defrost overlong time, and causing units consumption to improve and seriously affect user makes Use comfort.

Summary of the invention

It is an object of the present invention in view of the foregoing drawbacks, provide a kind of defrosting control method of heat pump unit, device, deposit Storage media and heat pump unit are unreasonable when solving to carry out defrost to outdoor unit fin in the prior art to lead into defrost condition The problem of causing defrost poor reliability achievees the effect that promote defrost reliability.

The present invention provides a kind of defrosting control method of heat pump unit, comprising: obtains the outdoor environment of the heat pump unit Temperature and operating status；Determine whether the outdoor environment temperature is greater than or equal to the lower limit of the first set temperature range；If institute The lower limit that outdoor environment temperature is less than the first set temperature range is stated, then according to the outdoor environment temperature and the operation State determines whether the heat pump unit meets the defrost condition of setting, to meet the defrost condition in the heat pump unit In the case of control the defrost process that the heat pump unit enters setting.

Optionally, determine whether the heat pump unit meets setting according to the outdoor environment temperature and the operating status Defrost condition, comprising: if the outdoor environment temperature be greater than or equal to the first set temperature range lower limit, basis The operating status enters the first defrost deterministic process of setting；Alternatively, being set if the outdoor environment temperature is less than described first Determine the lower limit of temperature range and be greater than or equal to the lower limit of the second set temperature range, then enters according to the operation state and set The second fixed defrost deterministic process；The upper limit of the second set temperature range is equal under the first set temperature range Limit；Alternatively, if the outdoor environment temperature be less than the second set temperature range lower limit, according to the operation state into Enter the third defrost deterministic process of setting.

Optionally, the operating status, comprising: runing time, the defrost temperature of compressor low-pressure side, compressor low-pressure side At least one of rate of temperature change, blower electric current and inflow temperature of defrost temperature；Wherein, enter according to the operation state First defrost deterministic process of setting, comprising: determine whether the runing time of the heat pump unit is greater than or equal to the first setting Time；If the runing time is greater than or equal to first setting time, it is determined that the outdoor environment temperature of the heat pump unit Whether degree and the defrost temperature difference of defrost temperature are greater than or equal to the first setting temperature difference；If the defrost temperature difference is greater than or equal to described First set temperature, it is determined that whether the rate of temperature change of the heat pump unit defrost temperature is more than or equal to the first setting variation Rate；If the rate of temperature change is greater than or equal to the first setting change rate, it is determined that the blower electric current of the heat pump unit Whether the first setting electric current is greater than or equal to；If the blower electric current is greater than or equal to first setting electric current, it is determined that institute Whether the inflow temperature for stating heat pump unit is greater than or equal to the first set temperature, described to be greater than or equal in the inflow temperature Determine that the heat pump unit meets the defrost condition in the case where first set temperature；Alternatively, according to the operation state into Enter the second defrost deterministic process of setting, comprising: determine whether the runing time of the heat pump unit is greater than or equal to second and sets It fixes time；If the runing time is greater than or equal to second setting time, it is determined that the outdoor environment of the heat pump unit Whether the defrost temperature difference of temperature and defrost temperature is greater than or equal to the second setting temperature difference；If the defrost temperature difference is greater than or equal to institute State the second set temperature, it is determined that whether the rate of temperature change of the heat pump unit defrost temperature is more than or equal to the second setting variation Rate；If the rate of temperature change is greater than or equal to the second setting change rate, it is determined that the blower electric current of the heat pump unit Whether the second setting electric current is greater than or equal to；If the blower electric current is greater than or equal to second setting electric current, it is determined that institute Whether the inflow temperature for stating heat pump unit is greater than or equal to the second set temperature, described to be greater than or equal in the inflow temperature Determine that the heat pump unit meets the defrost condition in the case where second set temperature；Alternatively, according to the operation state into Enter the third defrost deterministic process of setting, comprising: determine whether the runing time of the heat pump unit sets more than or equal to third It fixes time；If the runing time is greater than or equal to the third setting time, it is determined that the outdoor environment of the heat pump unit Whether the defrost temperature difference of temperature and defrost temperature is greater than or equal to the third setting temperature difference；If the defrost temperature difference is greater than or equal to institute State third set temperature, it is determined that whether the rate of temperature change of the heat pump unit defrost temperature is more than or equal to third setting variation Rate；If the rate of temperature change, which is greater than or equal to the third, sets change rate, it is determined that the blower electric current of the heat pump unit Whether third setting electric current is greater than or equal to；If the blower electric current is greater than or equal to the third setting electric current, it is determined that institute Whether the inflow temperature for stating heat pump unit is greater than or equal to third set temperature, described to be greater than or equal in the inflow temperature Determine that the heat pump unit meets the defrost condition in the case where third set temperature.

Optionally, the heat pump unit is controlled in the case where the heat pump unit meets the defrost condition enter setting Defrost process, comprising: in the case where the heat pump unit meets the defrost condition, by the compressor of the heat pump unit After frequency is adjusted to the initial frequencies of setting, the four-way valve commutation of the heat pump unit is controlled, while by the heat pump unit Electronic expansion valve opening is opened to the defrost step number of setting, carries out the defrost that defrost operation enters setting to control the heat pump unit Program；In the case where the heat pump unit enters the defrost program, the compressor frequency is improved to setpoint frequency, and control Make the reverse defrost of finned heat exchanger of the heat pump unit.

Optionally, further includes: obtain defrost parameter of the heat pump unit under the defrost process；Determine the defrost What whether parameter reached setting exits defrost condition；If the defrost parameter, which reaches described, exits defrost condition, by the pressure After contracting unit frequency is adjusted to the initial frequencies, the heat is controlled after controlling the four-way valve commutation and continuous operation setting duration Pump assembly exits the defrost program by the target operating parameters operation of setting to control the heat pump unit.

Optionally, the defrost parameter, comprising: the defrost temperature of the compressor detected in continuous setting duration, heat pump The water inlet temperature of heat pump unit during defrost time of unit, blower electric current, the rate of temperature change of compressor defrost temperature, defrost At least one of degree, high side temperature of compressor；Wherein it is determined that the defrost parameter whether reach setting exit defrost Condition, comprising: determine whether the defrost temperature is greater than or equal to the first of setting and exits defrost temperature；If the defrost temperature Defrost temperature is exited more than or equal to described first, it is determined that the defrost temperature reaches described and exits defrost condition；Alternatively, really What whether the fixed defrost time was greater than or equal to setting exits the defrost time；If the defrost time is greater than or equal to described move back The defrost time out, it is determined that the defrost time reaches described and exits defrost condition；Alternatively, determining whether the blower electric current is small Defrost electric current is exited in or equal to setting；If the blower electric current exits defrost electric current described in being less than or equal to, it is determined that institute It states blower electric current and reaches described and exit defrost condition；Alternatively, determining whether the rate of temperature change is greater than or equal to moving back for setting Defrost change rate out；If the rate of temperature change exits defrost change rate described in being greater than or equal to, it is determined that the temperature change Rate reaches described and exits defrost condition；Alternatively, determining that the inflow temperature is less than or equal to the second of setting and exits defrost temperature； If the inflow temperature, which is less than or equal to described second, exits defrost temperature, it is determined that the inflow temperature reaches the exiting Ice-lolly part；Alternatively, the third for determining whether the high side temperature is greater than or equal to setting exits defrost temperature；If the high pressure Side temperature is greater than or equal to the third and exits defrost temperature, it is determined that the high side temperature reaches described and exits defrost item Part.

Match with the above method, another aspect of the present invention provides a kind of defrosting control device of heat pump unit, comprising: obtains Unit is taken, for obtaining the outdoor environment temperature and operating status of the heat pump unit；Control unit, for determining the outdoor Whether environment temperature is greater than or equal to the lower limit of the first set temperature range；Described control unit, if being also used to the outdoor ring Border temperature is less than the lower limit of the first set temperature range, then is determined according to the outdoor environment temperature and the operating status Whether the heat pump unit meets the defrost condition of setting, to control in the case where the heat pump unit meets the defrost condition Make the defrost process that the heat pump unit enters setting.

Optionally, described control unit determines the heat pump unit according to the outdoor environment temperature and the operating status Whether satisfaction setting defrost condition, comprising: if the outdoor environment temperature be greater than or equal to the first set temperature range Lower limit, then according to the operation state enter setting the first defrost deterministic process；Alternatively, if the outdoor environment temperature is small Lower limit in the first set temperature range and the lower limit more than or equal to the second set temperature range, then according to the fortune Row state enters the second defrost deterministic process of setting；The upper limit of the second set temperature range is equal to the first setting temperature Spend the lower limit of range；Alternatively, if the outdoor environment temperature is less than the lower limit of the second set temperature range, according to Operating status enters the third defrost deterministic process of setting.

Optionally, the operating status, comprising: runing time, the defrost temperature of compressor low-pressure side, compressor low-pressure side At least one of rate of temperature change, blower electric current and inflow temperature of defrost temperature；Wherein, described control unit is according to Operating status enters the first defrost deterministic process of setting, comprising: determine the runing time of the heat pump unit whether be greater than or Equal to the first setting time；If the runing time is greater than or equal to first setting time, it is determined that the heat pump unit Outdoor environment temperature and the defrost temperature difference of defrost temperature whether be greater than or equal to the first setting temperature difference；If the defrost temperature difference is big In or be equal to first set temperature, it is determined that whether the rate of temperature change of the heat pump unit defrost temperature is more than or equal to the One setting change rate；If the rate of temperature change is greater than or equal to the first setting change rate, it is determined that the heat pump unit Blower electric current whether be greater than or equal to the first setting electric current；If the blower electric current is greater than or equal to the first setting electricity Stream, it is determined that whether the inflow temperature of the heat pump unit is greater than or equal to the first set temperature, with big in the inflow temperature In or equal to determining that the heat pump unit meets the defrost condition in the case where first set temperature；Alternatively, the control Unit processed enters the second defrost deterministic process of setting according to the operation state, comprising: determines the operation of the heat pump unit Whether the time is greater than or equal to the second setting time；If the runing time is greater than or equal to second setting time, really Whether the outdoor environment temperature of the fixed heat pump unit and the defrost temperature difference of defrost temperature are greater than or equal to the second setting temperature difference；If The defrost temperature difference is greater than or equal to second set temperature, it is determined that the rate of temperature change of the heat pump unit defrost temperature Whether second setting change rate is more than or equal to；If the rate of temperature change is greater than or equal to the second setting change rate, really Whether the blower electric current of the fixed heat pump unit is greater than or equal to the second setting electric current；If the blower electric current is greater than or equal to institute State the second setting electric current, it is determined that whether the inflow temperature of the heat pump unit is greater than or equal to the second set temperature, in institute It states inflow temperature and meets the defrost condition more than or equal to the heat pump unit determining in the case where second set temperature； Alternatively, described control unit enters the third defrost deterministic process of setting according to the operation state, comprising: determine the heat pump Whether the runing time of unit is greater than or equal to third setting time；If the runing time is set more than or equal to the third Time, it is determined that whether the defrost temperature difference of the outdoor environment temperature of the heat pump unit and defrost temperature sets more than or equal to third Determine the temperature difference；If the defrost temperature difference is greater than or equal to the third set temperature, it is determined that the heat pump unit defrost temperature Whether rate of temperature change is more than or equal to third setting change rate；If the rate of temperature change is greater than or equal to the third, setting becomes Rate, it is determined that whether the blower electric current of the heat pump unit is greater than or equal to third setting electric current；If the blower electric current is big In or equal to the third setting electric current, it is determined that whether the inflow temperature of the heat pump unit is greater than or equal to third setting temperature Degree, to be determined in the case where the inflow temperature is greater than or equal to the third set temperature described in the heat pump unit satisfaction Defrost condition.

Optionally, described control unit controls the heat pump in the case where the heat pump unit meets the defrost condition Unit enters the defrost process of setting, comprising: in the case where the heat pump unit meets the defrost condition, by the heat pump After the compressor frequency of unit is adjusted to the initial frequencies of setting, the four-way valve commutation of the heat pump unit is controlled, while by institute The electronic expansion valve opening for stating heat pump unit is opened to the defrost step number of setting, with control the heat pump unit carry out defrost run into Enter the defrost program of setting；In the case where the heat pump unit enters the defrost program, the compressor frequency is improved extremely Setpoint frequency, and the reverse defrost of finned heat exchanger for controlling the heat pump unit.

Optionally, further includes: described control unit is also used to obtain change of the heat pump unit under the defrost process White parameter；Described control unit is also used to determine that whether the defrost parameter reached setting exits defrost condition；The control Unit exits defrost condition if being also used to the defrost parameter and reaching described, the compressor frequency is adjusted to described initial After changing frequency, the target fortune for controlling the heat pump unit by setting after the four-way valve commutation and continuous operation setting duration is controlled The operation of row parameter, exits the defrost program to control the heat pump unit.

Optionally, the defrost parameter, comprising: the defrost temperature of the compressor detected in continuous setting duration, heat pump The water inlet temperature of heat pump unit during defrost time of unit, blower electric current, the rate of temperature change of compressor defrost temperature, defrost At least one of degree, high side temperature of compressor；Wherein, described control unit determines whether the defrost parameter reaches and sets Fixed exits defrost condition, comprising: determines whether the defrost temperature is greater than or equal to the first of setting and exits defrost temperature；If The defrost temperature is greater than or equal to described first and exits defrost temperature, it is determined that the defrost temperature reaches described and exits defrost Condition；Alternatively, determining that whether defrost time be greater than or equal to setting exits the defrost time；If the defrost time is greater than Or the defrost time is exited equal to described, it is determined that the defrost time reaches described and exits defrost condition；Alternatively, determining the wind Electromechanics stream whether be less than or equal to setting exit defrost electric current；If the blower electric current exits defrost electricity described in being less than or equal to Stream, it is determined that the blower electric current reaches described and exits defrost condition；Alternatively, determining whether the rate of temperature change is greater than or waits Defrost change rate is exited in setting；If the rate of temperature change exits defrost change rate described in being greater than or equal to, it is determined that institute It states rate of temperature change and reaches described and exit defrost condition；Alternatively, determining that the inflow temperature is less than or equal to the second of setting and moves back Defrost temperature out；If the inflow temperature, which is less than or equal to described second, exits defrost temperature, it is determined that the inflow temperature reaches Defrost condition is exited to described；Alternatively, the third for determining whether the high side temperature is greater than or equal to setting exits defrost temperature Degree；If the high side temperature, which is greater than or equal to the third, exits defrost temperature, it is determined that the high side temperature reaches institute It states and exits defrost condition.

Match with above-mentioned apparatus, further aspect of the present invention provides a kind of heat pump unit, comprising: above-described heat pump machine The defrosting control device of group.

Match with the above method, further aspect of the present invention provides a kind of storage medium, comprising: deposited in the storage medium Contain a plurality of instruction；The a plurality of instruction, for being loaded by processor and being executed the defrosting control of above-described heat pump unit Method.

Match with the above method, further aspect of the present invention provides a kind of heat pump unit, comprising: processor, for executing A plurality of instruction；Memory, for storing a plurality of instruction；Wherein, a plurality of instruction, for being stored by the memory, and by The processor loads and executes the defrosting control method of above-described heat pump unit.

The solution of the present invention detects unit outdoor environment temperature, low-pressure temperature (or sensor temperature), unit by unit Runing time and unit blower curent change situation, the frosting situation of comprehensive descision unit fin control unit in time and carry out Defrost promotes the defrost reliability of unit.

Further, the solution of the present invention detects unit outdoor environment temperature, low-pressure temperature (or sensor temperature by unit Degree), unit runing time and unit blower curent change situation, improve unit winter heating heat efficiency and user use Comfort level.

Further, the solution of the present invention, by the way that the curent change situation of blower is included in the judgement of unit defrost condition, accurately Judge the frosting situation of unit fin, controls unit defrost in time, promote the defrost reliability of unit.

Further, the solution of the present invention, by the way that the curent change situation of blower is included in the judgement of unit defrost condition, accurately Judge the frosting situation of unit fin, guarantees unit heating effect in winter and unit efficiency, reduce the use in winter energy consumption of unit.

Further, the solution of the present invention, by the way that the curent change situation of blower is included in the judgement of unit defrost condition, accurately Judge the frosting situation of unit fin, control unit defrost in time, improves unit winter heating heat efficiency and user uses and relaxes Appropriateness.

The solution of the present invention as a result, by according to unit outdoor environment temperature, low-pressure temperature, unit runing time and Unit blower curent change situation, the frosting situation of comprehensive descision unit fin, to control machine in time when determination needs defrost Group carries out defrost, and the unreasonable defrost condition that enters causes defrost can when solving to carry out defrost to outdoor unit fin in the prior art By the problem of property difference, thus, overcome defrost poor reliability, the defect of units consumption height and poor user experience in the prior art, it is real Existing defrost good reliability, the beneficial effect that units consumption is low and user experience is good.

Other features and advantages of the present invention will be illustrated in the following description, also, partly becomes from specification It obtains it is clear that understand through the implementation of the invention.

Below by drawings and examples, technical scheme of the present invention will be described in further detail.

Detailed description of the invention

Fig. 1 is the flow diagram of an embodiment of the defrosting control method of heat pump unit of the invention；

Fig. 2 is the implementation for entering the first defrost deterministic process of setting in method of the invention according to the operation state The flow diagram of example；

Fig. 3 is the implementation for entering the second defrost deterministic process of setting in method of the invention according to the operation state The flow diagram of example；

Fig. 4 is the implementation for entering the third defrost deterministic process of setting in method of the invention according to the operation state The flow diagram of example；

Fig. 5 is that the heat pump is controlled in the case where the heat pump unit meets the defrost condition in method of the invention Unit enters the flow diagram of an embodiment of the defrost process of setting；

Fig. 6 reaches for the defrost parameter in method of the invention during defrost exits defrost when exiting defrost condition The flow diagram of one embodiment；

Fig. 7 is to judge whether the stream for reaching the embodiment for exiting defrost condition according to defrost temperature in method of the invention Journey schematic diagram；

Fig. 8 is to judge whether the stream for reaching the embodiment for exiting defrost condition according to the defrost time in method of the invention Journey schematic diagram；

Fig. 9 is to judge whether the stream for reaching the embodiment for exiting defrost condition according to blower electric current in method of the invention Journey schematic diagram；

Figure 10 is to be judged whether to reach the embodiment for exiting defrost condition according to rate of temperature change in method of the invention Flow diagram；

Figure 11 is to be judged whether to reach the embodiment for exiting defrost condition according to inflow temperature in method of the invention Flow diagram；

Figure 12 is to be judged whether to reach the embodiment for exiting defrost condition according to high side temperature in method of the invention Flow diagram；

Figure 13 is the structural schematic diagram of an embodiment of the defrosting control device of heat pump unit of the invention；

Figure 14 is the structural schematic diagram of an embodiment of heat pump unit (such as air-conditioning system) of the invention, wherein (a) is to set The air-conditioning system there are two low tension switch is set, (b) is the air-conditioning system for being provided with a pressure sensor；

Figure 15 is the control system logical schematic of an embodiment of heat pump unit of the invention；

Figure 16 is the defrost time diagram of an embodiment of heat pump unit of the invention.

In conjunction with attached drawing, appended drawing reference is as follows in the embodiment of the present invention:

102- acquiring unit；104- control unit；1- compressor；2- is vented temperature sensing package；3- high-voltage switch gear；4- high pressure sensing Device；5- four-way valve；6- finned heat exchanger；7- environment temperature sensing package；8- defrost temperature sensing package；9- electric expansion valve；The heat exchange of 10- water side Device；11- is discharged temperature sensing package；12- water inlet temperature sensing package；13- water pump；14- gas-liquid separator (i.e. vapour point)；15- heats low tension switch； 16- refrigeration low tension switch；17- low pressure sensor.

Specific embodiment

To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with the specific embodiment of the invention and Technical solution of the present invention is clearly and completely described in corresponding attached drawing.Obviously, described embodiment is only the present invention one Section Example, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not doing Every other embodiment obtained under the premise of creative work out, shall fall within the protection scope of the present invention.

According to an embodiment of the invention, a kind of defrosting control method of heat pump unit is provided, it is of the invention as shown in Figure 1 The flow diagram of one embodiment of method.The defrosting control method of the heat pump unit may include: step S110 to step S130。

At step S110, the outdoor environment temperature of the heat pump unit and the operating status of the heat pump unit are obtained.

Such as: preferential detection unit runs outdoor environment temperature T_{It is outdoor}, according to outdoor environment temperature T_{It is outdoor}Judge unit into Enter the condition of defrost.

At step S120, determine whether the outdoor environment temperature is greater than or equal to the lower limit of the first set temperature range (such as 5 DEG C).

At step S130, if the outdoor environment temperature is less than the lower limit of the first set temperature range, basis The outdoor environment temperature and the operating status determine whether the heat pump unit meets the defrost condition of setting (as specifically may be used Be according to the outdoor environment temperature in the first set temperature range and the second set temperature range present position and described Operating status determines whether the heat pump unit meets the defrost condition of setting), to meet the defrost in the heat pump unit The defrost process that the heat pump unit enters setting is controlled in the case where condition.

Such as: when detecting unit local environment temperature in II~IV range (such as 5 DEG C of > T_{It is outdoor}) it is interior when, detect unit on Runing time t after secondary defrost_{Runing time}, judge continuous operating time t_{Runing time}With setting T_TimeIt is compared, when detecting machine Group continuous heating runing time t_{Runing time}When >=3h, judge that unit has met unit defrost runing time, and detect unit at this time T_Defrost, when detecting T_Defrost≤ -6 DEG C, judge that unit fin meets defrost condition, while detecting unit blower size of current I_Blower, When detecting blower electric current I_Blower≥I_{If 1}, the inflow temperature of unit is detected, as inflow temperature T_{Inflow temperature}At >=8 DEG C, judge that water temperature is full Sufficient defrost condition, while detecting the time conditions before combining, temperature condition, blower current condition, water temperature condition, 4 conditions Comprehensive descision unit meets defrost condition, and unit enters defrost.

During specifically used, if the outdoor environment temperature is greater than or equal under the first set temperature range Limit, then the heat pump unit does not enter defrost.

Such as: work as T_{It is outdoor}At >=5 DEG C, unit does not enter defrost.

As a result, by the case where lower limit of the outdoor environment temperature of heat pump unit less than the first set temperature range, Determine whether heat pump unit meets the defrost condition of setting according to the operating status of outdoor environment temperature and heat pump unit, in heat Pump assembly carries out defrost when meeting the defrost condition in time, on the one hand ensure that the timeliness and reliability of defrost, on the other hand Avoid frostless defrost or defrost overlong time.

Wherein, the operating status may include: runing time (i.e. continuous operation after heat pump unit last time defrost Runing time), rate of temperature change, the blower electric current of the defrost temperature of compressor low-pressure side, compressor low-pressure side defrost temperature At least one of with inflow temperature.

Such as: when detecting unit outdoor environment temperature, low-pressure temperature (or sensor temperature), unit operation by unit Between and unit blower curent change situation, the frosting situation of comprehensive descision unit fin, in time control unit carry out defrost, It has been truly realized white defrost, it is frostless not change, improve unit winter heating heat efficiency and user's usage comfort.In this way, passing through The curent change situation of blower is included in the judgement of unit defrost condition, the frosting situation of accurate judgement unit fin controls in time Unit defrost guarantees unit heating effect in winter and unit efficiency, reduces the use in winter energy consumption of unit.

Such as: when outdoor environment temperature, low-pressure temperature (or low pressure sensor temperature), unit by detecting unit are run Between, blower curent change situation it is multifactor judge unit in winter heating when fin frosting situation, unit is carried out in time Defrost guarantees unit heating capacity and efficiency, improves user's winter heating comfort.

Judge whether heat pump unit meets by the operating status based on diversified forms and in conjunction with outdoor environment temperature as a result, Defrost condition is conducive to the accuracy and reliability that promote judgement.

In an optional example, in step S130 according to the outdoor environment temperature and operating status determination Whether heat pump unit meets the defrost condition of setting, may include following any judging whether heat pump unit meets defrost condition Situation.

The first judges whether heat pump unit meets the situation of defrost condition: if the outdoor environment temperature is greater than or equal to The lower limit of the first set temperature range then enters the first defrost deterministic process of setting according to the operation state.

Such as: as 5 DEG C of > T_{It is outdoor}At >=-5 DEG C, the first defrost deterministic process that unit is set according to operating status is (such as 1) defrost judges.

Change it is alternatively possible to enter the first of setting in method of the invention according to the operation state as shown in connection with fig. 2 One embodiment flow diagram of white deterministic process further illustrates and sentences according to the operation state into the first defrost of setting The detailed process of disconnected process, may include: step S210 to step S250.

Step S210, determines whether the runing time of the heat pump unit is greater than or equal to the first setting time (such as 30min)。

Step S220, if the runing time is greater than or equal to first setting time, it is determined that the heat pump unit Outdoor environment temperature and the defrost temperature difference of defrost temperature whether be greater than or equal to the first setting temperature difference (such as 4 DEG C).

Step S230, if the defrost temperature difference is greater than or equal to first set temperature, it is determined that the heat pump unit Whether the rate of temperature change of defrost temperature is more than or equal to the first setting change rate (such as a).

Step S240, if the rate of temperature change is greater than or equal to the first setting change rate, it is determined that the heat pump Whether the blower electric current of unit is greater than or equal to the first setting electric current (such as I_{If 2})。

Step S250, if the blower electric current is greater than or equal to first setting electric current, it is determined that the heat pump unit Inflow temperature whether be greater than or equal to the first set temperature (such as 9 DEG C), to be greater than or equal to described the in the inflow temperature Determine that the heat pump unit meets the defrost condition in the case where one set temperature.

Such as: defrost judges 1: detection unit size runing time t_{Runing time}, when detecting t_{Runing time}When >=30min, in real time Detect unit T_DefrostAnd change rate V_Defrost, and judge defrost temperature difference △ T_Defrost, △ T defrost=T_{It is outdoor}-T_Defrost, when detecting △ T_Defrost≥4 When, judge V_DefrostSize, when detection V_DefrostWhen >=a, unit, which meets, enters defrost condition, while detecting unit blower size of current I_Blower, when detecting I_Blower≥I_{If 2}When, meet blower and enter defrost condition, while detecting unit T_{Inflow temperature}, when detecting that unit is full Sufficient T_{Inflow temperature}At >=9 DEG C, judge that unit meets defrost condition, unit carries out defrost movement.

As a result, by the case where the runing time of heat pump unit is greater than or equal to the first setting time, gradually foundation Outdoor environment temperature and the defrost temperature difference of defrost temperature, the rate of temperature change of heat pump unit defrost temperature, blower electric current, water inlet temperature Degree etc. precisely judges whether heat pump unit meets defrost condition, and the accuracy of judgement is good, high reliablity.

Judge whether heat pump unit meets the situation of defrost condition second: if the outdoor environment temperature is less than described the The lower limit (i.e. the upper limit of the second set temperature range, such as -5 DEG C) of one set temperature range and it is greater than or equal to the second setting temperature The lower limit (such as -10 DEG C) for spending range, then enter the second defrost deterministic process of setting according to the operation state.Described second sets The upper limit for determining temperature range is equal to the lower limit of the first set temperature range.

Such as: as -5 DEG C of > T_{It is outdoor}At >=-10 DEG C, the second defrost deterministic process that unit is set according to operating status (such as defrost judges 2).

Change it is alternatively possible to enter the second of setting in method of the invention according to the operation state as shown in connection with fig. 3 One embodiment flow diagram of white deterministic process further illustrates and sentences according to the operation state into the second defrost of setting The detailed process of disconnected process, may include: step S310 to step S350.

Step S310, determines whether the runing time of the heat pump unit is greater than or equal to the second setting time (such as 45min)。

Step S320, if the runing time is greater than or equal to second setting time, it is determined that the heat pump unit Outdoor environment temperature and the defrost temperature difference of defrost temperature whether be greater than or equal to the second setting temperature difference (such as 5 DEG C).

Step S330, if the defrost temperature difference is greater than or equal to second set temperature, it is determined that the heat pump unit Whether the rate of temperature change of defrost temperature is more than or equal to the second setting change rate (such as b).

Step S340, if the rate of temperature change is greater than or equal to the second setting change rate, it is determined that the heat pump Whether the blower electric current of unit is greater than or equal to the second setting electric current (such as I_{If 3})。

Step S350, if the blower electric current is greater than or equal to second setting electric current, it is determined that the heat pump unit Inflow temperature whether be greater than or equal to the second set temperature (such as 8 DEG C), to be greater than or equal to described the in the inflow temperature Determine that the heat pump unit meets the defrost condition in the case where two set temperatures.

Such as: defrost judges 2: detection unit size runing time t_{Runing time}, when detecting t_{Runing time}When >=45min, in real time Detect unit T_DefrostAnd change rate V_Defrost, and judge defrost temperature difference △ T_Defrost, △ T_Defrost=T_{It is outdoor}-T_Defrost, when detecting △ T_DefrostWhen >=5, Judge V_DefrostSize, when detection V_DefrostWhen >=b, unit, which meets, enters defrost condition, while detecting unit blower size of current I_Blower, when detecting I_Blower≥I_{If 3}When, meet blower and enter defrost condition, while detecting unit T_{Inflow temperature}, when detecting that unit is full Sufficient T_{Inflow temperature}At >=8 DEG C, judge that unit meets defrost condition, unit carries out defrost movement.

As a result, by the case where the runing time of heat pump unit is greater than or equal to the second setting time, gradually foundation Outdoor environment temperature and the defrost temperature difference of defrost temperature, the rate of temperature change of heat pump unit defrost temperature, blower electric current, water inlet temperature Degree etc. precisely judges whether heat pump unit meets defrost condition, and the accuracy of judgement is good, high reliablity.

The third judges whether heat pump unit meets the situation of defrost condition: if the outdoor environment temperature is less than described the The lower limit (such as -10 DEG C) of two set temperature ranges, then enter the third defrost deterministic process of setting according to the operation state.

Such as: as -10 DEG C >=T_{It is outdoor}When, unit enters third defrost deterministic process (such as defrost of setting according to operating status Judge 3).

As a result, by carrying out defrost judgement according to operating status under different outdoor environment temperature conditions, be conducive to be promoted To the accuracy and reliability of the judgement of frosting situation, and then promote the accuracy and reliability of defrost.

It is alternatively possible to enter the third of setting in method of the invention according to the operation state as shown in connection with fig. 4 One embodiment flow diagram of white deterministic process further illustrates and sentences according to the operation state into the third defrost of setting The detailed process of disconnected process, may include: step S410 to step S450.

Step S410, determines whether the runing time of the heat pump unit is greater than or equal to third setting time (such as 55min)。

Step S420, if the runing time is greater than or equal to the third setting time, it is determined that the heat pump unit Outdoor environment temperature and defrost temperature the defrost temperature difference whether be greater than or equal to third setting the temperature difference (such as 6 DEG C).

Step S430, if the defrost temperature difference is greater than or equal to the third set temperature, it is determined that the heat pump unit Whether the rate of temperature change of defrost temperature is more than or equal to third setting change rate (such as c).

Step S440, if the rate of temperature change is greater than or equal to the third and sets change rate, it is determined that the heat pump Whether the blower electric current of unit is greater than or equal to third setting electric current (such as I_{If 4})。

Step S450, if the blower electric current is greater than or equal to the third setting electric current, it is determined that the heat pump unit Inflow temperature whether be greater than or equal to third set temperature (such as 7 DEG C), to be greater than or equal to described the in the inflow temperature Determine that the heat pump unit meets the defrost condition in the case where three set temperatures.

Such as: defrost judges 3: detection unit size runing time t_{Runing time}, when detecting t_{Runing time}When >=55min, in real time Detect unit T_DefrostAnd change rate V_Defrost, and judge defrost temperature difference △ T_Defrost, △ T_Defrost=T_{It is outdoor}-T_Defrost, when detecting △ T_DefrostWhen >=6, Judge V_DefrostSize, when detection V_DefrostWhen >=c, unit, which meets, enters defrost condition, while detecting unit blower size of current I_Blower, when detecting I_Blower≥I_{If 4}When, meet blower and enter defrost condition, while detecting unit T_{Inflow temperature}, when detecting that unit is full Sufficient T_{Inflow temperature}At >=7 DEG C, judge that unit meets defrost condition, unit carries out defrost movement.

As a result, by the case where the runing time of heat pump unit is greater than or equal to third setting time, gradually foundation Outdoor environment temperature and the defrost temperature difference of defrost temperature, the rate of temperature change of heat pump unit defrost temperature, blower electric current, water inlet temperature Degree etc. precisely judges whether heat pump unit meets defrost condition, and the accuracy of judgement is good, high reliablity.

In an optional example, can meet in method of the invention in the heat pump unit as shown in connection with fig. 5 described in The embodiment flow diagram that the heat pump unit enters the defrost process of setting is controlled in the case where defrost condition, further Illustrate that controlling the heat pump unit in step S130 in the case where the heat pump unit meets the defrost condition enters setting Defrost process detailed process, may include: step S510 and step S520.

Step S510, in the case where the heat pump unit meets the defrost condition, by the compression of the heat pump unit After unit frequency is adjusted to the initial frequencies of setting, the four-way valve commutation of the heat pump unit is controlled, while by the heat pump unit Electronic expansion valve opening open to the defrost step number of setting, carry out the change that defrost operation enters setting to control the heat pump unit White program.

Such as: prepare before defrost: when unit, which detects, meets defrost condition, unit starts to be acted, first to compression Machine running frequency is adjusted, and machine set compressor frequency is adjusted to the initial frequencies of unit, four-way valve is opened after the completion of adjustment Beginning commutates, while electric expansion valve is opened to defrost step number, and unit enters defrost operation.

Step S520 improves the compressor frequency extremely in the case where the heat pump unit enters the defrost program Setpoint frequency, and the reverse defrost of finned heat exchanger for controlling the heat pump unit.

Such as: the defrost stage: after unit enters defrost program, starting to improve compressor operating frequency, inverse to fin type To defrost, the parameters of real-time detection unit, including T_{High pressure}、T_Defrost、V_Defrost、I_BlowerEtc. parameters.

As a result, by elder generation the case where heat pump unit meets defrost condition, compressor frequency is adjusted to just in the initial stage After beginningization frequency, control four-way valve commutate simultaneously electric expansion valve is opened to the defrost step number of setting, thus control heat pump unit into Row defrost program and then compressor frequency is improved to setpoint frequency, and control the reverse defrost of finned heat exchanger, can be improved The efficiency and effect of defrost.

It can also include: that defrost parameter during defrost reaches and exits defrost item in an optional embodiment The process of defrost is exited when part.

Reach when exiting defrost condition below with reference to the defrost parameter in method of the invention shown in Fig. 6 during defrost An embodiment flow diagram of defrost is exited, further illustrates that defrost parameter during defrost reaches and exits defrost condition When exit the detailed process of defrost, may include: step S610 to step S630.

Step S610 controls the heat pump unit entrance in the case where the heat pump unit meets the defrost condition and sets During fixed defrost, after the reverse defrost of finned heat exchanger for controlling the heat pump unit, the heat pump unit is obtained In the defrost parameter (specifically obtaining defrost parameter of the heat pump unit under the defrost program) under the defrost process.

Such as: defrost terminates: after unit detects that unit arbitrary parameter meets defrost release condition, unit carries out defrost Movement is exited, adjusts compressor operating frequency to unit initial frequencies, then four-way valve commutates, after continuous operation 1min Unit is carried out controlling to adjust unit operating parameter by normal control target.

Wherein, the defrost parameter, may include: the defrost temperature of the compressor detected in continuous setting duration (i.e. The low-side temperature of compressor), the defrost time of heat pump unit, blower electric current, compressor defrost temperature rate of temperature change, change At least one of the high side temperature of the inflow temperature, compressor of heat pump unit during frost.

Such as: outdoor environment temperature T_{It is outdoor}, defrost temperature (low pressure sensor temperature) T_Defrost, defrost rate of temperature change V_Defrost, machine Group heating continuous operating time t_{Runing time}, blower electric current I_Blower, unit inflow temperature T_{Inflow temperature}, defrost duration t_{The defrost time}。

Judge whether the defrost process of heat pump unit reaches moving back for setting by the defrost parameter based on diversified forms as a result, Defrost condition out is conducive to the accuracy and reliability that promote judgement.

Step S620 determines that whether the defrost parameter reached setting exits defrost condition.

Determine that whether the defrost parameter reached setting exits defrost item in an optional example, in step S620 Part may include following at least one situation for exiting defrost.

The first exits defrost situation: being judged whether to reach the process for exiting defrost condition according to defrost temperature.

The one of defrost condition is exited below with reference to judging whether to reach according to defrost temperature in method of the invention shown in Fig. 7 Embodiment flow diagram, further explanation judged whether to reach the detailed process for exiting defrost condition according to defrost temperature, can To include: step S710 and step S720.

Step S710, determines whether the defrost temperature is greater than or equal to the first of setting and exits defrost temperature (such as 18 ℃)。

Step S720, if the defrost temperature, which is greater than or equal to described first, exits defrost temperature, it is determined that the defrost Temperature reaches described and exits defrost condition.

Such as: during unit carries out defrost, the following parameter of real-time detection judges whether unit exits defrost: continuous 10s detects T_Defrost≥18℃。

Defrost condition is exited by determining that defrost parameter reaches in the case where defrost temperature reaches setting condition as a result, The accuracy of judgement is good, high reliablity.

It exits defrost situation second: being judged whether to reach the process for exiting defrost condition according to the defrost time.

The one of defrost condition is exited below with reference to judging whether to reach according to the defrost time in method of the invention shown in Fig. 8 Embodiment flow diagram, further explanation judged whether to reach the detailed process for exiting defrost condition according to the defrost time, can To include: step S810 and step S820.

Step S810 determines that whether the defrost time be greater than or equal to setting exits defrost time (such as 8min).

Step S820, if the defrost time exits the defrost time more than or equal to described, it is determined that the defrost time Reach described and exits defrost condition.

Such as: during unit carries out defrost, the following parameter of real-time detection judges whether unit exits defrost: t_{The defrost time} ≥8min。

Defrost condition is exited by determining that defrost parameter reaches in the case where the defrost time reaching setting condition as a result, The accuracy of judgement is good, high reliablity.

The third exits defrost situation: being judged whether to reach the process for exiting defrost condition according to blower electric current.

The one of defrost condition is exited below with reference to judging whether to reach according to blower electric current in method of the invention shown in Fig. 9 Embodiment flow diagram, further explanation judged whether to reach the detailed process for exiting defrost condition according to blower electric current, can To include: step S910 and step S920.

Step S910 determines that whether the blower electric current be less than or equal to setting exits defrost electric current (such as I_{If 1})。

Step S920, if the blower electric current exits defrost electric current less than or equal to described, it is determined that the blower electric current Reach described and exits defrost condition.

Such as: during unit carries out defrost, the following parameter of real-time detection judges whether unit exits defrost: unit Blower electric current I_Blower≤I_{If 1}。

Defrost condition is exited by determining that defrost parameter reaches in the case where blower electric current reaches setting condition as a result, The accuracy of judgement is good, high reliablity.

4th kind is exited defrost situation: being judged whether to reach the process for exiting defrost condition according to rate of temperature change.

Defrost condition is exited below with reference to judging whether to reach according to rate of temperature change in method of the invention shown in Figure 10 An embodiment flow diagram, further explanation judged whether to reach the specific mistake for exiting defrost condition according to rate of temperature change Journey may include: step S1010 and step S1020.

Step S1010, determine the rate of temperature change whether be greater than or equal to setting exit defrost change rate (such as 2 DEG C/ s)。

Step S1020, if the rate of temperature change exits defrost change rate more than or equal to described, it is determined that the temperature Change rate reaches described and exits defrost condition.

Such as: during unit carries out defrost, the following parameter of real-time detection judges whether unit exits defrost: V_Defrost≥ 2℃/s。

Defrost item is exited by determining that defrost parameter reaches in the case where rate of temperature change reaches setting condition as a result, Part, the accuracy of judgement is good, high reliablity.

5th kind is exited defrost situation: being judged whether to reach the process for exiting defrost condition according to inflow temperature.

Defrost condition is exited below with reference to judging whether to reach according to inflow temperature in method of the invention shown in Figure 11 One embodiment flow diagram, further explanation judged whether to reach the detailed process for exiting defrost condition according to inflow temperature, It may include: step S1110 and step S1120.

Step S1110 determines that the inflow temperature is less than or equal to the second of setting and exits defrost temperature (such as 3 DEG C).

Step S1120, if the inflow temperature, which is less than or equal to described second, exits defrost temperature, it is determined that the water inlet Temperature reaches described and exits defrost condition.

Such as: during unit carries out defrost, the following parameter of real-time detection judges whether unit exits defrost: defrost Process unit water inlet T_{Water inlet}≤3℃。

It determines that defrost parameter reaches in the case where reaching setting condition by the inflow temperature in heat pump unit as a result, to exit Defrost condition, the accuracy of judgement is good, high reliablity.

6th kind is exited defrost situation: being judged whether to reach the process for exiting defrost condition according to high side temperature.

Defrost condition is exited below with reference to judging whether to reach according to high side temperature in method of the invention shown in Figure 12 An embodiment flow diagram, further explanation judged whether to reach the specific mistake for exiting defrost condition according to high side temperature Journey may include: step S1210 and step S1220.

Step S1210, determines whether the high side temperature is greater than or equal to the third of setting and exits defrost temperature (such as 61 ℃)。

Step S1220, if the high side temperature is greater than or equal to the third and exits defrost temperature, it is determined that the height Pressure side temperature reaches described and exits defrost condition.

Such as: during unit carries out defrost, the following parameter of real-time detection judges whether unit exits defrost: T_{High pressure}≥ 61℃。

It determines that defrost parameter reaches in the case where reaching setting condition by the high side temperature in compressor as a result, to exit Defrost condition, the accuracy of judgement is good, high reliablity.

The compressor frequency is adjusted to institute if the defrost parameter, which reaches described, exits defrost condition by step S630 After stating initial frequencies, the heat pump unit is controlled by setting after controlling the four-way valve commutation and continuous operation setting duration Target operating parameters operation, exits the defrost program to control the heat pump unit.

As a result, by detecting defrost parameter during defrost, and defrost condition is exited what defrost parameter reached setting In the case where compressor frequency is adjusted to after initial frequencies control again after the commutation of control four-way valve and continuous operation setting duration According to target operating parameter is run heat pump unit, is realized that heat pump unit exits defrost program, to exit defrost in time, is met heat pump The normal operation of unit promotes user experience, also saves energy consumption.

Through a large amount of verification experimental verification, using the technical solution of the present embodiment, by unit detect unit outdoor environment temperature, Low-pressure temperature (or sensor temperature), unit runing time and unit blower curent change situation, comprehensive descision unit fin Frosting situation, in time control unit carry out defrost, promote the defrost reliability of unit.

According to an embodiment of the invention, additionally providing a kind of heat pump unit of the defrosting control method corresponding to heat pump unit Defrosting control device.The structural schematic diagram of one embodiment of the device of the invention shown in Figure 13.The change of the heat pump unit White control device may include: acquiring unit 102 and control unit 104.

In an optional example, acquiring unit 102, can be used for obtaining the heat pump unit outdoor environment temperature and The operating status of the heat pump unit.The concrete function of the acquiring unit 102 and processing are referring to step S110.

In an optional example, control unit 104 is determined for whether the outdoor environment temperature is greater than or waits In the lower limit (such as 5 DEG C) of the first set temperature range.The concrete function of the control unit 104 and processing are referring to step S120.

In an optional example, described control unit 104, if can be also used for the outdoor environment temperature less than described The lower limit of first set temperature range then determines that the heat pump unit is according to the outdoor environment temperature and the operating status The no defrost condition for meeting setting is (as specifically can be according to the outdoor environment temperature in the first set temperature range and second Present position and the operating status determine whether the heat pump unit meets the defrost condition of setting in set temperature range), To control the defrost process that the heat pump unit enters setting in the case where the heat pump unit meets the defrost condition.

During specifically used, if the outdoor environment temperature is greater than or equal under the first set temperature range Limit, then the heat pump unit does not enter defrost.The concrete function of the control unit 104 and processing see also step S130.

Such as: work as T_{It is outdoor}At >=5 DEG C, unit does not enter defrost.

Optionally, described control unit 104 determines the heat pump according to the outdoor environment temperature and the operating status Whether unit meets the defrost condition of setting, may include the situation of following any determinization ice-lolly part.

The situation of the first determinization ice-lolly part: described control unit 104, if specifically can be also used for the outdoor environment Temperature is greater than or equal to the lower limit of the first set temperature range, then enters the first defrost of setting according to the operation state Deterministic process.

More optionally, described control unit 104 enters the first defrost deterministic process of setting according to the operation state, can To include:

Described control unit 104, specifically can be also used for determining whether the runing time of the heat pump unit is greater than or waits In the first setting time (such as 30min).The concrete function of the control unit 104 and processing see also step S210.

Described control unit 104, if specifically can be also used for the runing time more than or equal to the described first setting Between, it is determined that whether the outdoor environment temperature of the heat pump unit and the defrost temperature difference of defrost temperature are greater than or equal to the first setting The temperature difference (such as 4 DEG C).The concrete function of the control unit 104 and processing see also step S220.

Described control unit 104, if specifically can be also used for the defrost temperature difference is greater than or equal to the first setting temperature Degree, it is determined that whether the rate of temperature change of the heat pump unit defrost temperature is more than or equal to the first setting change rate (such as a).The control The concrete function of unit 104 processed and processing see also step S230.

Described control unit 104, if specifically can be also used for the rate of temperature change is greater than or equal to first setting Change rate, it is determined that whether the blower electric current of the heat pump unit is greater than or equal to the first setting electric current (such as I_{If 2}).The control list The concrete function of member 104 and processing see also step S240.

Described control unit 104, if specifically can be also used for the blower electric current is greater than or equal to the first setting electricity Stream, it is determined that whether the inflow temperature of the heat pump unit is greater than or equal to the first set temperature (such as 9 DEG C), in the water inlet Temperature determines that the heat pump unit meets the defrost condition in the case where being greater than or equal to first set temperature.The control The concrete function of unit 104 and processing see also step S250.

The situation of second of determinization ice-lolly part: described control unit 104, if specifically can be also used for the outdoor environment Temperature be less than the lower limit (i.e. the upper limit of the second set temperature range, such as -5 DEG C) of the first set temperature range and be greater than or Equal to the lower limit (such as -10 DEG C) of the second set temperature range, then enter the second defrost judgement of setting according to the operation state Process.The upper limit of the second set temperature range is equal to the lower limit of the first set temperature range.

More optionally, described control unit 104 enters the second defrost deterministic process of setting according to the operation state, can To include:

Described control unit 104, specifically can be also used for determining whether the runing time of the heat pump unit is greater than or waits In the second setting time (such as 45min).The concrete function of the control unit 104 and processing see also step S310.

Described control unit 104, if specifically can be also used for the runing time more than or equal to the described second setting Between, it is determined that whether the outdoor environment temperature of the heat pump unit and the defrost temperature difference of defrost temperature are greater than or equal to the second setting The temperature difference (such as 5 DEG C).The concrete function of the control unit 104 and processing see also step S320.

Described control unit 104, if specifically can be also used for the defrost temperature difference is greater than or equal to the second setting temperature Degree, it is determined that whether the rate of temperature change of the heat pump unit defrost temperature is more than or equal to the second setting change rate (such as b).The control The concrete function of unit 104 processed and processing see also step S330.

Described control unit 104, if specifically can be also used for the rate of temperature change is greater than or equal to second setting Change rate, it is determined that whether the blower electric current of the heat pump unit is greater than or equal to the second setting electric current (such as I_{If 3}).The control list The concrete function of member 104 and processing see also step S340.

Described control unit 104, if specifically can be also used for the blower electric current is greater than or equal to the second setting electricity Stream, it is determined that whether the inflow temperature of the heat pump unit is greater than or equal to the second set temperature (such as 8 DEG C), in the water inlet Temperature determines that the heat pump unit meets the defrost condition in the case where being greater than or equal to second set temperature.The control The concrete function of unit 104 and processing see also step S350.

The situation of the third determinization ice-lolly part: described control unit 104, if specifically can be also used for the outdoor environment Temperature is less than the lower limit (such as -10 DEG C) of the second set temperature range, then enters the third of setting according to the operation state Defrost deterministic process.

More optionally, described control unit 104 enters the third defrost deterministic process of setting according to the operation state, can To include:

Described control unit 104, specifically can be also used for determining whether the runing time of the heat pump unit is greater than or waits In third setting time (such as 55min).The concrete function of the control unit 104 and processing see also step S410.

Described control unit 104, if specifically can be also used for the runing time more than or equal to third setting Between, it is determined that whether the outdoor environment temperature of the heat pump unit and the defrost temperature difference of defrost temperature are greater than or equal to third setting The temperature difference (such as 6 DEG C).The concrete function of the control unit 104 and processing see also step S420.

Described control unit 104, if specifically can be also used for the defrost temperature difference more than or equal to third setting temperature Degree, it is determined that whether the rate of temperature change of the heat pump unit defrost temperature is more than or equal to third setting change rate (such as c).The control The concrete function of unit 104 processed and processing see also step S430.

Described control unit 104 is set if specifically can be also used for the rate of temperature change more than or equal to the third Change rate, it is determined that whether the blower electric current of the heat pump unit is greater than or equal to third setting electric current (such as I_{If 4}).The control list The concrete function of member 104 and processing see also step S440.

Described control unit 104, if specifically can be also used for the blower electric current more than or equal to third setting electricity Stream, it is determined that whether the inflow temperature of the heat pump unit is greater than or equal to third set temperature (such as 7 DEG C), in the water inlet Temperature determines that the heat pump unit meets the defrost condition in the case where being greater than or equal to the third set temperature.The control The concrete function of unit 104 and processing see also step S450.

Optionally, described in described control unit 104 is controlled in the case where the heat pump unit meets the defrost condition Heat pump unit enters the defrost process of setting, may include:

Described control unit 104 specifically can be also used in the case where the heat pump unit meets the defrost condition, After the compressor frequency of the heat pump unit to be adjusted to the initial frequencies of setting, the four-way valve for controlling the heat pump unit is changed To, while the electronic expansion valve opening of the heat pump unit being opened to the defrost step number of setting, with control the heat pump unit into Row defrost operation enters the defrost program of setting.The concrete function of the control unit 104 and processing see also step S510.

Described control unit 104 specifically can be also used in the case where the heat pump unit enters the defrost program, The compressor frequency is improved to setpoint frequency, and the reverse defrost of finned heat exchanger for controlling the heat pump unit.The control The concrete function of unit 104 and processing see also step S520.

It can also include: that defrost parameter during defrost reaches and exits defrost item in an optional embodiment The process of defrost is exited when part, specific as follows:

Described control unit 104 can be also used for controlling in the case where the heat pump unit meets the defrost condition The heat pump unit enters during the defrost of setting, the reverse defrost of finned heat exchanger for controlling the heat pump unit it Afterwards, it obtains defrost parameter of the heat pump unit under the defrost process and (specifically obtains the heat pump unit in describedization Defrost parameter under white program).The concrete function of the control unit 104 and processing see also step S610.

Described control unit 104 can be also used for determining that whether the defrost parameter reached setting exits defrost condition. The concrete function of the control unit 104 and processing see also step S620.

Optionally, described control unit 104 determines that whether the defrost parameter reached setting exits defrost condition, can be with Comprise at least one of the following the situation for exiting defrost:

The first exits defrost situation: being judged whether to reach the process for exiting defrost condition according to defrost temperature, specifically such as Under:

Described control unit 104 specifically can be also used for determining whether the defrost temperature is greater than or equal to setting One exits defrost temperature (such as 18 DEG C).The concrete function of the control unit 104 and processing see also step S710.

Described control unit 104, if specifically can be also used for the defrost temperature more than or equal to first the exiting White temperature, it is determined that the defrost temperature reaches described and exits defrost condition.The concrete function of the control unit 104 and processing are also Referring to step S720.

It exits defrost situation second: being judged whether to reach the process for exiting defrost condition according to the defrost time, specifically such as Under:

Described control unit 104 specifically can be also used for determining whether the defrost time is greater than or equal to moving back for setting Defrost time (such as 8min) out.The concrete function of the control unit 104 and processing see also step S810.

Described control unit 104, if specifically can be also used for the defrost time be greater than or equal to it is described when exiting defrost Between, it is determined that the defrost time reaches described and exits defrost condition.The concrete function of the control unit 104 and processing are seen also Step S820.

The third exits defrost situation: being judged whether to reach the process for exiting defrost condition according to blower electric current, specifically such as Under:

Described control unit 104 specifically can be also used for determining whether the blower electric current is less than or equal to moving back for setting Defrost electric current (such as I out_{If 1}).The concrete function of the control unit 104 and processing see also step S910.

Described control unit 104 exits defrost electricity less than or equal to described if specifically can be also used for the blower electric current Stream, it is determined that the blower electric current reaches described and exits defrost condition.The concrete function of the control unit 104 and processing are seen also Step S920.

4th kind is exited defrost situation: being judged whether to reach the process for exiting defrost condition according to rate of temperature change, specifically It is as follows:

Described control unit 104 specifically can be also used for determining whether the rate of temperature change is greater than or equal to setting Exit defrost change rate (such as 2 DEG C/s).The concrete function of the control unit 104 and processing see also step S1010.

Described control unit 104 exits defrost more than or equal to described if specifically can be also used for the rate of temperature change Change rate, it is determined that the rate of temperature change reaches described and exits defrost condition.The concrete function of the control unit 104 and processing See also step S1020.

5th kind is exited defrost situation: being judged whether to reach the process for exiting defrost condition according to inflow temperature, specifically such as Under:

Described control unit 104 specifically can be also used for determining that the inflow temperature is less than or equal to the second of setting and moves back Defrost temperature (such as 3 DEG C) out.The concrete function of the control unit 104 and processing see also step S1110.

Described control unit 104, if specifically can be also used for the inflow temperature less than or equal to second the exiting White temperature, it is determined that the inflow temperature reaches described and exits defrost condition.The concrete function of the control unit 104 and processing are also Referring to step S1120.

6th kind is exited defrost situation: being judged whether to reach the process for exiting defrost condition according to high side temperature, specifically It is as follows:

Described control unit 104 specifically can be also used for determining whether the high side temperature is greater than or equal to setting Third exits defrost temperature (such as 61 DEG C).The concrete function of the control unit 104 and processing see also step S1210.

Described control unit 104 exits if specifically can be also used for the high side temperature more than or equal to the third Defrost temperature, it is determined that the high side temperature reaches described and exits defrost condition.The concrete function of the control unit 104 and place Reason sees also step S1220.

Described control unit 104 exits defrost condition if can be also used for the defrost parameter and reach described, will be described After compressor frequency is adjusted to the initial frequencies, controls the four-way valve and commutate and after continuous operation setting duration described in control Heat pump unit exits the defrost program by the target operating parameters operation of setting to control the heat pump unit.The control list The concrete function of member 104 and processing see also step S630.

The processing and function realized by the device of the present embodiment essentially correspond to earlier figures 1 to method shown in Figure 12 Embodiment, principle and example, therefore not detailed place in the description of the present embodiment may refer to mutually speaking on somebody's behalf in previous embodiment Bright, this will not be repeated here.

Through a large amount of verification experimental verification, using technical solution of the present invention, unit outdoor environment temperature, low is detected by unit Temperature (or sensor temperature), unit runing time and unit blower curent change situation are pressed, unit winter heating system is improved Thermal energy effect and user's usage comfort.

According to an embodiment of the invention, additionally providing a kind of heat pump machine of the defrosting control device corresponding to heat pump unit Group.The heat pump unit may include: the defrosting control device of above-described heat pump unit.

In an optional embodiment, the solution of the present invention detects unit outdoor environment temperature, low pressure temperature by unit Spend (or sensor temperature), unit runing time and unit blower curent change situation, the frosting of comprehensive descision unit fin Situation controls unit in time and carries out defrost, has been truly realized white defrost, frostless not change, and improves unit winter heating heat efficiency With user's usage comfort.

In this way, by the way that the curent change situation of blower is included in the judgement of unit defrost condition, accurate judgement unit fin Frosting situation controls unit defrost in time, guarantees unit heating effect in winter and unit efficiency, reduces the use in winter energy of unit Consumption.

It, can be in conjunction with example shown in Figure 14 to Figure 16, to the solution of the present invention in an optional specific embodiment Specific implementation process illustrate.

(a) is consistent with the chief component of the two air-conditioning systems shown in (b) in Figure 14, wherein shown in (a) Air-conditioning system compressor low-pressure side use two low tension switches, (b) shown in air-conditioning system make in the low-pressure side of compressor Two pressure switches are substituted with a pressure sensor, it is all detection system low pressure that function is the same, protects unit in too low pressure It is run under power.

Such as: air-conditioning system shown in (a) in Figure 14 may include: compressor 1, exhaust temperature sensing package 2, high-voltage switch gear 3, height Pressure sensor 4, four-way valve 5, finned heat exchanger 6, environment temperature sensing package 7, defrost temperature sensing package 8, electric expansion valve 9, water-side heat 10, temperature sensing package 11, water inlet temperature sensing package 12, water pump 13, gas-liquid separator 14, heating low tension switch 15 and refrigeration low tension switch are discharged 16.And in Figure 14 in air-conditioning system shown in (b), it is low with being heated in air-conditioning system shown in (a) in 17 alternate figures 14 of low pressure sensor Compress switch 15 and refrigeration low tension switch 16.

In Figure 14, compressor can be used for the refrigerant of low-temp low-pressure being collapsed into high pressure gaseous refrigerant.High pressure Switch, can be used for preventing system pressure excessively high, and pressure is more than that certain value closes system, protect unit operational reliability.High pressure Sensor can be used for detection system high-pressure, and the system control for cooling and warming is in the reasonable scope.Four-way valve, can To carry out cooling and warming for carrying out refrigerant flow switching.Finned heat exchanger can be used for the gaseous coolant of high temperature and pressure is cold Congeal into the liquid refrigerants of medium temperature high pressure.Electric expansion valve can be used for the liquid refrigerants reducing pressure by regulating flow by medium temperature high pressure into low temperature The gas-liquid two-phase refrigerant of low pressure.Water-side heat can be used for refrigerant and flash to gaseous state in heat exchanger, absorb heat simultaneously, will change Water in hot device becomes cold water by high-temperature water.Water pump can be used for the water circulation in water system constantly producing cold water Or hot water supply exchanges heat to interior.Gas-liquid separator can be used for refrigerant carrying out gas-liquid separation, make to enter compressor Interior refrigerant is gaseous state, and preventing liquid refrigerants compression leads to compressor damage.Low tension switch or low pressure sensor, Ke Yiyong In preventing the too low damage compressor of system low-voltage, timely action protection stops unit operation when being more than protection value.

In an optional specific example, a kind of defrosting control method proposed by the present invention, the parameter being related to mainly may be used To include: outdoor environment temperature T_{It is outdoor}, defrost temperature (low pressure sensor temperature) T_Defrost, defrost rate of temperature change V_Defrost, unit heating Continuous operating time t_{Runing time}, blower electric current I_Blower, unit inflow temperature T_{Inflow temperature}, defrost duration t_{The defrost time}。

Such as: there is the sensor of a defrost temperature that can detecte unit in unit temperature sensor, it can be with the period Property detect the defrost temperature of unit, and defrost temperature is recorded, the defrost temperature that control program will test carries out one The defrost differential thermal calculation of fixed cycle, obtains the change rate of defrost temperature.For example, every 1min detects a defrost temperature, then 1min Interior detection 2 times, and temperature of beginning are 5 DEG C, and end is once 2 DEG C, then defrost rate of temperature change be (5-2)/1=3 DEG C/ min。

Optionally, the judgement of defrost entry condition may refer to as described below.

When unit is switched under operating status, real-time detection unit continues heating operation time t_{Runing time}, outdoor environment temperature T_{It is outdoor}, defrost temperature (or low pressure sensor temperature) T_Defrost, blower electric current I_Blower, unit leaving water temperature T_{Leaving water temperature}。

Such as: the purpose for detecting leaving water temperature is to prevent from unit leaving water temperature is too low in the process of defrosting to lead to unit pipe There is ice condition in road, and unit defrost belongs to refrigerating operaton, and unit inflow temperature is high at this time, and leaving water temperature is low, when unit detects When being lower than a certain value to unit leaving water temperature, unit automatically exits from defrost, prevents unit from ice condition occur.

Such as: when unit enters defrost, intaking is 7 DEG C, and being discharged is 4 DEG C, with the progress of defrost, whole system water temperature by It gradually reduces, leaving water temperature is gradually lowered, and when detecting leaving water temperature lower than 2 DEG C, we cannot change again in program judgement Frost acts, generation the case where in order to protect unit that must stop defrost, prevent freezing unit.

Preferential detection unit runs outdoor environment temperature T_{It is outdoor}, according to outdoor environment temperature T_{It is outdoor}Judge unit enters defrost Condition.

I. work as T_{It is outdoor}At >=5 DEG C, unit does not enter defrost.

Ii. as 5 DEG C of > T_{It is outdoor}At >=-5 DEG C, the first defrost deterministic process that unit is set according to operating status is (as changed 1) frost judges.

Iii. as -5 DEG C of > T_{It is outdoor}At >=-10 DEG C, the second defrost deterministic process that unit is set according to operating status (such as defrost judges 2).

Iv. as -10 DEG C >=T_{It is outdoor}When, unit according to operating status enters the third defrost deterministic process of setting, and (such as defrost is sentenced Break 3).

When detecting that unit local environment temperature is in II~IV range, the operation after the defrost of unit last time is detected Time t_{Runing time}, judge continuous operating time t_{Runing time}With setting T_TimeIt is compared, when detecting unit continuous heating runing time t_{Runing time}When >=3h, judge that unit has met unit defrost runing time, and detect the T of unit at this time_Defrost, when detecting T_Defrost ≤ -6 DEG C, judge that unit fin meets defrost condition, while detecting unit blower size of current I_Blower, when detecting blower electric current I_Blower≥I_{If 1}, the inflow temperature of unit is detected, as inflow temperature T_{Inflow temperature}At >=8 DEG C, judge that water temperature meets defrost condition, simultaneously Time conditions, temperature condition, blower current condition, water temperature condition before detection combination, 4 condition comprehensive descision units meet Defrost condition, unit enter defrost.

Defrost judges 1:

Detect unit size runing time t_{Runing time}, when detecting t_{Runing time}When >=30min, real-time detection unit T_DefrostAnd become Rate V_Defrost, and judge defrost temperature difference △ T_Defrost, △ T defrost=T_{It is outdoor}-T_Defrost, when detecting △ T_DefrostWhen >=4, V is judged_DefrostIt is big It is small, as detection V_DefrostWhen >=a, unit, which meets, enters defrost condition, while detecting unit blower size of current I_Blower, when detecting I_Blower≥I_{If 2}When, meet blower and enter defrost condition, while detecting unit T_{Inflow temperature}, when detecting that unit meets T_{Inflow temperature}≥9℃ When, judge that unit meets defrost condition, unit carries out defrost movement.

Defrost judges 2:

Detect unit size runing time t_{Runing time}, when detecting t_{Runing time}When >=45min, real-time detection unit T_DefrostAnd become Rate V_Defrost, and judge defrost temperature difference △ T_Defrost, △ T_Defrost=T_{It is outdoor}-T_Defrost, when detecting △ T_DefrostWhen >=5, V is judged_DefrostSize, As detection V_DefrostWhen >=b, unit, which meets, enters defrost condition, while detecting unit blower size of current I_Blower, when detecting I_Blower≥ I_{If 3}When, meet blower and enter defrost condition, while detecting unit T_{Inflow temperature}, when detecting that unit meets T_{Inflow temperature}At >=8 DEG C, sentence Off line group meets defrost condition, and unit carries out defrost movement.

Defrost judges 3:

Detect unit size runing time t_{Runing time}, when detecting t_{Runing time}When >=55min, real-time detection unit T_DefrostAnd become Rate V_Defrost, and judge defrost temperature difference △ T_Defrost, △ T_Defrost=T_{It is outdoor}-T_Defrost, when detecting △ T_DefrostWhen >=6, V is judged_DefrostSize, As detection V_DefrostWhen >=c, unit, which meets, enters defrost condition, while detecting unit blower size of current I_Blower, when detecting I_Blower≥ I_{If 4}When, meet blower and enter defrost condition, while detecting unit T_{Inflow temperature}, when detecting that unit meets T_{Inflow temperature}At >=7 DEG C, sentence Off line group meets defrost condition, and unit carries out defrost movement.

Optionally, the judgement of defrost exit criteria may refer to as described below.

During unit carries out defrost, the following parameter of real-time detection judges whether unit exits defrost:

1) continuous 10s detects T_Defrost≥18℃。

2)t_{The defrost time}≥8min。

3) unit blower electric current I_Blower≤I_{If 1}。

4)V_Defrost≥2℃/s。

5) defrost process unit water inlet T_{Water inlet}≤3℃。

6)T_{High pressure}≥61℃。

Optionally, defrost process may refer to as described below.

1., prepare before defrost:

When unit, which detects, meets defrost condition, unit starts to be acted, and first adjusts to compressor operating frequency Section, machine set compressor frequency is adjusted to the initial frequencies of unit, and four-way valve starts to commutate after the completion of adjustment, while electricity Sub- expansion valve is opened to defrost step number, and unit enters defrost operation.

2., the defrost stage:

After unit enters defrost program, start to improve compressor operating frequency, to the reverse defrost of fin type, real-time detection The parameters of unit, including T_{High pressure}、T_Defrost、V_Defrost、I_BlowerEtc. parameters.

3., defrost terminates:

After unit detects that unit arbitrary parameter meets defrost release condition, unit carries out defrost and exits movement, adjusts Compressor operating frequency is to unit initial frequencies, and then four-way valve commutates, and unit is by normal control after continuous operation 1min Target processed carries out controlling to adjust unit operating parameter.

In an alternative specific example, defrost can be controlled by detection evaporator low-pressure temperature, can also led to Cross periodical time progress defrost.

Such as: the two schemes and our motion compare, and set off by contrast the advantage of our schemes out, the two schemes are deposited In certain limitation, cause unit that can also enter defrost in the case where frostless, fin does not tie many frosts at this time, this When enter defrost waste of energy, reduce system water temperature, influence unit efficiency.

The processing and function realized by the heat pump unit of the present embodiment essentially correspond to device shown in earlier figures 13 Embodiment, principle and example, therefore not detailed place in the description of the present embodiment may refer to mutually speaking on somebody's behalf in previous embodiment Bright, this will not be repeated here.

Through a large amount of verification experimental verification, using technical solution of the present invention, by the way that the curent change situation of blower is included in machine Group defrost condition judgement, the frosting situation of accurate judgement unit fin control unit defrost in time, and the defrost for promoting unit is reliable Property.

According to an embodiment of the invention, a kind of storage for additionally providing the defrosting control method corresponding to heat pump unit is situated between Matter.The storage medium may include: that a plurality of instruction is stored in the storage medium；The a plurality of instruction, for by processor Load and execute the defrosting control method of above-described heat pump unit.

The processing and function realized by the storage medium of the present embodiment essentially correspond to earlier figures 1 to shown in Figure 12 Embodiment, principle and the example of method, therefore not detailed place in the description of the present embodiment, may refer to the phase in previous embodiment It speaks on somebody's behalf bright, this will not be repeated here.

Through a large amount of verification experimental verification, using technical solution of the present invention, by the way that the curent change situation of blower is included in machine Group defrost condition judgement, the frosting situation of accurate judgement unit fin guarantee unit heating effect in winter and unit efficiency, reduce The use in winter energy consumption of unit.

According to an embodiment of the invention, additionally providing a kind of heat pump machine of the defrosting control method corresponding to heat pump unit Group.The heat pump unit may include: processor, for executing a plurality of instruction；Memory, for storing a plurality of instruction；Wherein, The a plurality of instruction for being stored by the memory, and is loaded by the processor and executes above-described heat pump unit Defrosting control method.

The processing and function realized by the heat pump unit of the present embodiment essentially correspond to earlier figures 1 to shown in Figure 12 Embodiment, principle and the example of method, therefore not detailed place in the description of the present embodiment, may refer to the phase in previous embodiment It speaks on somebody's behalf bright, this will not be repeated here.

Through a large amount of verification experimental verification, using technical solution of the present invention, by the way that the curent change situation of blower is included in machine Group defrost condition judgement, the frosting situation of accurate judgement unit fin control unit defrost in time, improve unit winter heating system Thermal energy effect and user's usage comfort.

To sum up, it will be readily appreciated by those skilled in the art that under the premise of not conflicting, above-mentioned each advantageous manner can be certainly It combined, be superimposed by ground.

The above description is only an embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification, Equivalent replacement, improvement etc., should be included within scope of the presently claimed invention.

Claims

1. a kind of defrosting control method of heat pump unit characterized by comprising

Obtain the outdoor environment temperature and operating status of the heat pump unit；

Determine whether the outdoor environment temperature is greater than or equal to the lower limit of the first set temperature range；

If the outdoor environment temperature is less than the lower limit of the first set temperature range, according to the outdoor environment temperature and The operating status determines whether the heat pump unit meets the defrost condition of setting, to meet describedization in the heat pump unit The defrost process that the heat pump unit enters setting is controlled in the case where ice-lolly part.

2. the method according to claim 1, wherein true according to the outdoor environment temperature and the operating status Whether the fixed heat pump unit meets the defrost condition of setting, comprising:

If the outdoor environment temperature is greater than or equal to the lower limit of the first set temperature range, according to the operation state Into the first defrost deterministic process of setting；

Alternatively,

If the outdoor environment temperature is less than the lower limit of the first set temperature range and is greater than or equal to the second set temperature The lower limit of range then enters the second defrost deterministic process of setting according to the operation state；The second set temperature range The upper limit be equal to the first set temperature range lower limit；

Alternatively,

If the outdoor environment temperature is less than the lower limit of the second set temperature range, enters set according to the operation state Fixed third defrost deterministic process.

3. according to the method described in claim 2, it is characterized in that, the operating status, comprising: runing time, compressor are low Press the defrost temperature of side, the rate of temperature change of compressor low-pressure side defrost temperature, in blower electric current and inflow temperature at least it One；

Wherein,

Enter the first defrost deterministic process of setting according to the operation state, comprising:

Determine whether the runing time of the heat pump unit is greater than or equal to the first setting time；

If the runing time is greater than or equal to first setting time, it is determined that the outdoor environment temperature of the heat pump unit Whether it is greater than or equal to the first setting temperature difference with the defrost temperature difference of defrost temperature；

If the defrost temperature difference is greater than or equal to first set temperature, it is determined that the temperature of the heat pump unit defrost temperature Whether change rate is more than or equal to the first setting change rate；

If the rate of temperature change is greater than or equal to the first setting change rate, it is determined that the blower electric current of the heat pump unit Whether the first setting electric current is greater than or equal to；

If the blower electric current is greater than or equal to first setting electric current, it is determined that whether the inflow temperature of the heat pump unit More than or equal to the first set temperature, to be determined in the case where the inflow temperature is greater than or equal to first set temperature The heat pump unit meets the defrost condition；

Alternatively,

Enter the second defrost deterministic process of setting according to the operation state, comprising:

Determine whether the runing time of the heat pump unit is greater than or equal to the second setting time；

If the runing time is greater than or equal to second setting time, it is determined that the outdoor environment temperature of the heat pump unit Whether it is greater than or equal to the second setting temperature difference with the defrost temperature difference of defrost temperature；

If the defrost temperature difference is greater than or equal to second set temperature, it is determined that the temperature of the heat pump unit defrost temperature Whether change rate is more than or equal to the second setting change rate；

If the rate of temperature change is greater than or equal to the second setting change rate, it is determined that the blower electric current of the heat pump unit Whether the second setting electric current is greater than or equal to；

If the blower electric current is greater than or equal to second setting electric current, it is determined that whether the inflow temperature of the heat pump unit More than or equal to the second set temperature, to be determined in the case where the inflow temperature is greater than or equal to second set temperature The heat pump unit meets the defrost condition；

Alternatively,

Enter the third defrost deterministic process of setting according to the operation state, comprising:

Determine whether the runing time of the heat pump unit is greater than or equal to third setting time；

If the runing time is greater than or equal to the third setting time, it is determined that the outdoor environment temperature of the heat pump unit Whether it is greater than or equal to the third setting temperature difference with the defrost temperature difference of defrost temperature；

If the defrost temperature difference is greater than or equal to the third set temperature, it is determined that the temperature of the heat pump unit defrost temperature Whether change rate is more than or equal to third setting change rate；

If the rate of temperature change, which is greater than or equal to the third, sets change rate, it is determined that the blower electric current of the heat pump unit Whether third setting electric current is greater than or equal to；

If the blower electric current is greater than or equal to the third setting electric current, it is determined that whether the inflow temperature of the heat pump unit More than or equal to third set temperature, to be determined in the case where the inflow temperature is greater than or equal to the third set temperature The heat pump unit meets the defrost condition.

4. method described in one of -3 according to claim 1, which is characterized in that meet the defrost condition in the heat pump unit In the case where control the defrost process that the heat pump unit enters setting, comprising:

In the case where the heat pump unit meets the defrost condition, the compressor frequency of the heat pump unit is adjusted to set Initial frequencies after, control the four-way valve commutation of the heat pump unit, while the electric expansion valve of the heat pump unit being opened Degree is opened to the defrost step number of setting, carries out the defrost program that defrost operation enters setting to control the heat pump unit；

In the case where the heat pump unit enters the defrost program, the compressor frequency is improved to setpoint frequency, and control Make the reverse defrost of finned heat exchanger of the heat pump unit.

5. method described in one of -4 according to claim 1, which is characterized in that further include:

Obtain defrost parameter of the heat pump unit under the defrost process；

Determine that whether the defrost parameter reached setting exits defrost condition；

If the defrost parameter, which reaches described, exits defrost condition, the compressor frequency is adjusted to the initial frequencies Afterwards, the heat pump unit is controlled by the target operating parameters of setting after controlling the four-way valve commutation and continuous operation setting duration Operation, exits the defrost program to control the heat pump unit.

6. according to the method described in claim 5, it is characterized in that, the defrost parameter, comprising: detection in continuous setting duration The defrost temperature of the compressor arrived, the defrost time of heat pump unit, blower electric current, compressor defrost temperature rate of temperature change, At least one of the high side temperature of the inflow temperature, compressor of heat pump unit during defrost；

Wherein,

Determine that whether the defrost parameter reached setting exits defrost condition, comprising:

Determine whether the defrost temperature is greater than or equal to the first of setting and exits defrost temperature；

If the defrost temperature, which is greater than or equal to described first, exits defrost temperature, it is determined that the defrost temperature reaches described and moves back Defrost condition out；

Alternatively,

Determine that whether the defrost time be greater than or equal to setting exits the defrost time；

If the defrost time exits the defrost time described in being greater than or equal to, it is determined that the defrost time reaches the exiting Ice-lolly part；

Alternatively,

Determine that whether the blower electric current be less than or equal to setting exits defrost electric current；

If the blower electric current exits defrost electric current described in being less than or equal to, it is determined that the blower electric current reaches the exiting Ice-lolly part；

Alternatively,

Determine that whether the rate of temperature change be greater than or equal to setting exits defrost change rate；

If the rate of temperature change exits defrost change rate described in being greater than or equal to, it is determined that the rate of temperature change reaches described Exit defrost condition；

Alternatively,

Determine that the inflow temperature is less than or equal to the second of setting and exits defrost temperature；

If the inflow temperature, which is less than or equal to described second, exits defrost temperature, it is determined that the inflow temperature reaches described and moves back Defrost condition out；

Alternatively,

Determine whether the high side temperature is greater than or equal to the third of setting and exits defrost temperature；

If the high side temperature, which is greater than or equal to the third, exits defrost temperature, it is determined that the high side temperature reaches institute It states and exits defrost condition.

7. a kind of defrosting control device of heat pump unit characterized by comprising

Acquiring unit, for obtaining the outdoor environment temperature and operating status of the heat pump unit；

Control unit, for determining whether the outdoor environment temperature is greater than or equal to the lower limit of the first set temperature range；

Described control unit, if being also used to the lower limit that the outdoor environment temperature is less than the first set temperature range, root Determine whether the heat pump unit meets the defrost condition of setting according to the outdoor environment temperature and the operating status, in institute It states and controls the defrost process that the heat pump unit enters setting in the case that heat pump unit meets the defrost condition.

8. device according to claim 7, which is characterized in that described control unit is according to the outdoor environment temperature and institute It states operating status and determines whether the heat pump unit meets the defrost condition of setting, comprising:

Alternatively,

9. device according to claim 8, which is characterized in that the operating status, comprising: runing time, compressor are low Press the defrost temperature of side, the rate of temperature change of compressor low-pressure side defrost temperature, in blower electric current and inflow temperature at least it One；

Wherein,

Described control unit enters the first defrost deterministic process of setting according to the operation state, comprising:

Alternatively,

Described control unit enters the second defrost deterministic process of setting according to the operation state, comprising:

Alternatively,

Described control unit enters the third defrost deterministic process of setting according to the operation state, comprising:

10. the device according to one of claim 7-9, which is characterized in that described control unit is full in the heat pump unit The defrost process that the heat pump unit enters setting is controlled in the case where the foot defrost condition, comprising:

11. the device according to one of claim 7-10, which is characterized in that further include:

Described control unit is also used to obtain defrost parameter of the heat pump unit under the defrost process；

Described control unit is also used to determine that whether the defrost parameter reached setting exits defrost condition；

Described control unit exits defrost condition if being also used to the defrost parameter and reaching described, by the compressor frequency After being adjusted to the initial frequencies, controls and control the heat pump unit after four-way valve commutation and continuous operation setting duration and press The target operating parameters of setting are run, and exit the defrost program to control the heat pump unit.

12. device according to claim 11, which is characterized in that the defrost parameter, comprising: inspection in continuous setting duration The defrost temperature of the compressor measured, the defrost time of heat pump unit, blower electric current, compressor defrost temperature temperature change At least one of the high side temperature of the inflow temperature, compressor of heat pump unit during rate, defrost；

Wherein,

Described control unit determines that whether the defrost parameter reached setting exits defrost condition, comprising:

Alternatively,

13. a kind of heat pump unit characterized by comprising the defrosting control of the heat pump unit as described in claim 1-6 is any Device.

14. a kind of storage medium, which is characterized in that be stored with a plurality of instruction in the storage medium；The a plurality of instruction, is used for It is loaded by processor and executes the defrosting control method of the heat pump unit as described in claim 7-12 is any.

15. a kind of heat pump unit characterized by comprising

Processor, for executing a plurality of instruction；

Memory, for storing a plurality of instruction；

Wherein, a plurality of instruction for being stored by the memory, and is loaded by the processor and is executed such as claim The defrosting control method of any heat pump unit of 7-12.