CN107576109B - The control method and heat pump system of heat pump system - Google Patents
The control method and heat pump system of heat pump system Download PDFInfo
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- CN107576109B CN107576109B CN201710728241.1A CN201710728241A CN107576109B CN 107576109 B CN107576109 B CN 107576109B CN 201710728241 A CN201710728241 A CN 201710728241A CN 107576109 B CN107576109 B CN 107576109B
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Abstract
The present invention provides a kind of control method and heat pump system of heat pump system, it is provided with compressor on the refrigerant flow of heat pump system, it is provided with bypass branch between the suction line and gas exhaust piping of compressor, gas by-passing valve is provided on bypass branch, control method includes：After heat pump system carries out pattern switching, the real-time low voltage value X of compressor air suction mouth is detected；It as working time length of the compressor after pattern switching is different, is compared with real-time low voltage value X as criterion using different low pressure parameter value Y, if low voltage value X is less than low pressure parameter value Y in real time, controls the unlatching of gas by-passing valve；If real-time low voltage value X is greater than or equal to low pressure parameter value Y, the closing of gas by-passing valve is controlled.The present invention is different according to compressor operating duration, is compared and controls the opening and closing of gas by-passing valve with real-time low voltage value using different low pressure parameter values, make the reliability higher of heat pump system, and prevent gas by-passing valve from excessively opening.
Description
Technical field
The present invention relates to heat pump control technology fields, and in particular to a kind of control method and heat pump system of heat pump system.
Background technology
In recent years, as the improvement of people's living standards, China Middle-north Area will consume a large amount of Coal Energy Sources every year
For heating, a large amount of pollutants generated therewith cause environment constantly to deteriorate, and the exceedingly odious weather such as haze, sandstorm frequently goes out
It is existing.Residential central air- can be under the premise of not causing environmental pollution, while meeting heat supply in winter demand and cooling in summer need
It asks, it will gradually replacing coal heating becomes the new selection of people.
Monoblock type frequency conversion residential central air- unit is the heat pump unit for integrating refrigeration and heating, using two-stage enthalpy increasing
Compressor and converter technique, improve the low-temperature heating ability and high-temperature refrigeration ability of air-conditioner set, and expand unit range of operation
And outlet water temperature range, the low temperature heating demand of cold district can be met and meet summer high-temperature refrigeration demand, therefore,
It is widely used in increasing high-grade apartment, compound building, advanced villa, unit office building, dining room, shop, public place of entertainment
Deng.
The host of residential central air- includes split type outer machine and interior machine, also there is the form of internal-external machine one, interior owner
It to be made of inside heat exchanger, water pump and auxiliary thermal.Since residential central air- integrates refrigeration, the particularity of heating,
And require its compact overall structure, take up little area, therefore, the heat exchanger of interior machine generally uses double pipe heat exchanger or plate to change formula heat exchange
Device.Both above-mentioned heat exchanger is due to the design feature of itself, and internal refrigerant amount of storage is limited, to cause to freeze
In the case of easily cause that refrigerant evaporation is excessively complete, cause module low pressure when compressor operating down to 0 DEG C hereinafter, heat exchange
There are the risks of bursting by freezing for device water route runner.
In the prior art, under this pattern the limit value of low-voltage variation generally at -1 DEG C, i.e., compressor normal operation when, when going out
< -1 DEG C of the module low pressure of existing compressor, opening module low-voltage variation state, compressor complete machine are shut down.Residential central air- is in mistake
Cross season, carry out refrigeration and heating mode handoff procedure in, when especially switching to refrigeration mode from heating mode, compressor because
It is particularly pertinent that refrigerant lacks the problem of causing module low pressure too low and entering low-voltage variation state.
To solve the above-mentioned problems, high-low pressure by-passing valve is added in central air-conditioning system in the prior art, works as pressure
By-passing valve is opened when contracting machine enters low-voltage variation state to improve module low voltage value, improve because refrigerant lack cause compressor into
The problem of entering low-voltage variation state.But in heating starting up's stage, since throttling electronic expansion valve regulation is sluggish, compressor opens
The case where dynamic frequency changes, and load conversion causes compressor frequency rising etc. to lead to low-voltage module hypotony is more severe.Separately
Outside, since compressor rate of change is too fast, when air-conditioning is when heating mode switches to refrigeration mode, due to the work of air-conditioning early period
Process causes most of refrigerant to rest on outside, and therefore, compressor is easier to occur inhaling less than refrigerant and enter low-voltage variation
The problem of state.In view of the above-mentioned problems, merely by the opening and closing of method control gas by-passing valve in the prior art without
Method effectively solves the problems, such as compressor low-voltage variation, and bad usage experience is brought to user.
Invention content
In view of this, it is an object of the present invention to provide one kind to effectively prevent compressor to enter low-voltage variation
State, and prevent the control method for the heat pump system that gas by-passing valve excessively opens.
It is an object of the present invention to provide a kind of heat pump system, which uses heat pump system as described above
The control method of system controls compressor operating process.
In order to achieve the above objectives, on the one hand, the present invention uses following technical scheme：
A kind of control method of heat pump system is provided with compressor on the refrigerant flow of the heat pump system, in the pressure
It is provided with bypass branch between the suction line and gas exhaust piping of contracting machine, gas by-passing valve, institute are provided on the bypass branch
Heat pump system is stated with heating mode and refrigeration mode, the control method includes：
After the heat pump system carries out pattern switching, the real-time low voltage value X of compressor air suction mouth is detected；
As working time length of the compressor after pattern switching is different, using different low pressure parameter value Y conducts
Criterion is compared with the real-time low voltage value X, if the real-time low voltage value X is less than the low pressure parameter value Y, is controlled
The gas by-passing valve is opened；
If the real-time low voltage value X is greater than or equal to the low pressure parameter value Y, controls the gas by-passing valve and close；
Wherein, when the compressor is in high-low pressure establishment stage early period, the delivery temperature M of compressor is examined
It surveys, the compressor is controlled according to the case where the delivery temperature M.
Preferably, the heat pump system carry out pattern switching after and the predetermined time T that works on1Afterwards, compressor is detected
The real-time low voltage value X of air entry.
Preferably, the working time of the compressor is T,
As 0 < T < T1When, the real-time low voltage value X of compressor air suction mouth is not detected；
Work as T1≤T≤T2When, the low pressure reference value as criterion is Y1, to the real-time low voltage value X of compressor air suction mouth
It is detected, judges whether the real-time low voltage value X is less than low pressure parameter value Y1, if so, gas by-passing valve is opened, if it is not, then
Gas by-passing valve is closed；
As T > T2When, the low pressure reference value as criterion is Y2, the real-time low voltage value X of compressor air suction mouth is carried out
Detection, judges whether the real-time low voltage value X is less than low pressure parameter value Y2, if so, gas by-passing valve is opened, if it is not, then by gas
Port valve is closed；
Wherein, Y1More than Y2。
Preferably, work as T1≤T≤T2When, when the compressor is in high-low pressure establishment stage early period, the exhaust to compressor
Temperature M is detected, and is controlled the compressor according to the case where the delivery temperature M.
Preferably, the delivery temperature M is by detecting the temperature of the gas vent of compressor and/or the temperature on compression case top
It obtains.
Preferably, work as t1≤M≤t2When, control compressor carries out limit frequency and works；
Work as t2< M < t3When, control compressor carries out frequency reducing work and gas by-passing valve is forbidden to open；
As M >=t3When, control compressor shutdown.
Preferably, when real-time low voltage value X is less than the low pressure parameter value Y1When, and the delivery temperature t of compressor2< M < t3
When, the gas by-passing valve is closed.
Preferably, the t1Value be Z-2 Δs1- 1, unit：DEG C, Δ1Value range be 6-8, and/or,
The t2Value be Z-2 Δs2- 1, unit：DEG C, Δ2Value range be 4-5, and/or,
The t3Value be Z, Z according to compressor air-discharging protect temperature determine.
Preferably, the T1Value range be 90-150s, and/or,
The T2Value range be 450-750s and/or,
The Y1Value be W+2 Δs3+ 1, unit：DEG C, Δ3Value range be 3-5；And/or
The Y2Value be W+2 Δs4+ 1, unit：DEG C, Δ4Value range is 1-2；
Wherein, W is the system low-voltage protection value of compressor.
In order to achieve the above objectives, on the other hand, the present invention uses following technical scheme：
A kind of heat pump system is provided with compressor on the refrigerant flow of the heat pump system, in the air-breathing of the compressor
It is provided with bypass branch between pipeline and gas exhaust piping, gas by-passing valve, the heat pump system are provided on the bypass branch
With heating mode and refrigeration mode, the heat pump system is controlled using the control method of heat pump system as described above.
Advantageous effect：The present invention is different according to compressor operating duration, is marked as judgement using different low pressure parameter values
It is accurate to be compared with real-time low voltage value, being turned on and off for gas by-passing valve is controlled according to comparison result.Meanwhile detecting compressor row
Temperature degree or compression case top temperature control the working frequency of compressor according to the temperature value detected, compared to existing
There is the method that the opening and closing of gas by-passing valve is controlled by single condition in technology, makes the reliability higher of heat pump system, effectively prevent making
There is low-voltage variation state in heat pattern compressor into refrigeration mode transfer process, and prevents gas by-passing valve from excessively opening.
Description of the drawings
By referring to the drawings to the description of the embodiment of the present invention, the above and other purposes of the present invention, feature and
Advantage will be apparent from.
Fig. 1 is the air source heat pump system structure chart that the embodiment of the present invention one provides；
Fig. 2 is the flow chart of the control method for the heat pump system that the embodiment of the present invention one provides；
Fig. 3 is that the slave heating mode that the embodiment of the present invention one provides switches to system operation after refrigeration mode in 200 seconds
Figure；
Fig. 4 be air-conditioner set in the prior art from heating mode switch to refrigeration mode after system operation in 200 seconds
Figure.
In figure：
1, air-conditioner host；2, fan coil；3, elastomer connector；4, thermometer；5, pressure gauge；6, shut-off valve；7, by-passing valve；
8, filter；9, ground；10, check-valves；11, flowmeter；12, discharging valve；13, electric two-way valve；14, electric T-shaped valve；15,
Ball valve；16, automatic exhaust steam valve.
Specific implementation mode
Below based on embodiment, present invention is described, it should be understood by one skilled in the art that provided herein
Attached drawing is provided to the purpose of explanation, and attached drawing is not necessarily drawn to scale.
Unless the context clearly requires otherwise, "include", "comprise" otherwise throughout the specification and claims etc. are similar
Word should be construed as the meaning for including rather than exclusive or exhaustive meaning；That is, being containing for " including but not limited to "
Justice.
This application discloses a kind of control methods of heat pump system, when air-conditioning is converted from heating mode to refrigeration mode process
In, multiple Rule of judgment is set, and the real-time low voltage value of compressor air suction mouth is compared judgement with Rule of judgment, and according to
Judging result controls the gentle by-passing valve of the operating mode of compressor, obtains the higher heat pump system of functional reliability.Make
The gentle by-passing valve of the compressor of air-conditioning is controlled with the control method of above-mentioned heat pump system, compressor operating mistake can be prevented
Occur low-voltage variation state in journey, and gas by-passing valve can be effectively prevent excessively to open, causes efficiency excessive loss.Compared to existing
Have using the method for single control condition control gas by-passing valve opening and closing in technology, safety and reliability is more preferable, system stability
Higher, compressor are less prone to the too low problem of low pressure due to cold medium shortage.
Embodiment one
As shown in Figure 1, being typical air source heat pump system, the heat pump control method in the present embodiment is applied in Fig. 1 institutes
On the air source heat pump system shown.Air-conditioner host 1 is set on ground 9, and compressor is provided on the refrigerant flow of air-conditioning, pressure
It is provided with bypass branch between the suction line and gas exhaust piping of contracting machine, the equipment such as gas by-passing valve are provided on bypass branch, on
State the inside that equipment may be contained within air-conditioner host 1.Above-mentioned air-conditioning system has heating mode and refrigeration mode, and can be in heating mould
It is converted between formula and refrigeration mode, when carrying out pattern conversion, the operating mode of compressor is also required to be converted.Into one
Step, the air entry of compressor is low-pressure state, and exhaust outlet is high pressure conditions, and the real-time low voltage value detected in the present embodiment is logical
It crosses and acquisition is detected to compressor air suction mouth using pressure sensor.Also there is water-flow circuit, water cycle in air-conditioner host 1
Circuit is connected with running water system.The system further includes multiple fan coils 2, fan coil 2 by pipeline respectively with originally
Water system is connected to form complete water-flow circuit, and electric T-shaped valve 14 and ball valve 15 are provided on some fan coils 2, is had
Fan coil 2 on be provided with electric two-way valve 13.Check-valves 10, stream are disposed with outside the water outlet of water-flow circuit
Gauge 11 and discharging valve 12, for check-valves 10 for preventing the water in circuit from flowing back, flowmeter 11 is used to record the stream of water in pipeline
Amount.It is disposed with elastomer connector 3, thermometer 4,5 shut-off valve 6 of pressure gauge and filtering in the outside of the water inlet of water-flow circuit
Device 8.By-passing valve 7 is additionally provided between water-flow circuit inlet and outlet, when by-passing valve 7 is closed, the import of water-flow circuit
It needs to be connected to by complete water-flow circuit between outlet；When by-passing valve 7 is opened, can pass through between import and outlet
By-passing valve 7 is connected, and water flows to import by by-passing valve 7 from outlet.It is respectively arranged on inlet pipeline and outlet pipeline certainly
Dynamic air bleeding valve 16, automatic exhaust steam valve 16 are used for exhaust if necessary.
The heat pump control method in the application is illustrated below by a specific control method embodiment, it should
Control method is applied on air source heat pump system as described above.
When progress air-conditioning is converted from heating mode to refrigeration mode, compressor changes operational mode, the control dress of air-conditioning
It sets startup and working time to compressor to be detected, the working time of compressor is T.In the control method of the application,
Period where the working time T of compressor is different, using different control methods to the gentle by-passing valve of compressor into
Row control, specifically includes following three phases：
First stage, 0 < T < T1
In this stage, T1Value range be 90-150s, preferably 120s.The compressor operating time is in 0 < T < 120s
When in range, compressor is in startup stage, this stage control device portion controls the detection devices such as detection device and sensor not
Any detection operation is carried out to the gentle by-passing valve of compressor.This stage belongs to compressor rigid startup stage, and working condition is also unstable
Fixed, the low voltage value at the air entry of compressor is relatively low, and compressor enters the phenomenon that low-voltage variation state is common.But due to
The phase duration is shorter, and can use prior art shielding low-voltage, therefore is not necessarily in this stage to compressor air suction
The real-time low voltage value X of mouth is detected.Of course for simplify control process, it can also use and be converted from heating mode to refrigeration mould
Mode that just the real-time low voltage value X of compressor air suction mouth is detected at once after formula, but detect after real-time low voltage value X not
It controls the gentle by-passing valve of compressor and carries out any action.
Second stage, T1≤T≤T2
Compressor is in high-low pressure establishment stage early period in this stage, is carried out to the real-time low voltage value X of compressor air suction mouth
Detection, judges whether real-time low voltage value X is less than low pressure parameter value Y1, if so, gas by-passing valve is opened, if it is not, then gas by-passing valve
It closes.
In this stage, T2Value range be 450-750s, preferably 600s；Low pressure parameter value Y1For W+2 Δs3+ 1, it is single
Position：DEG C, Δ3Value range be 3-5, wherein parameter W be compressor system low-voltage protection value, different types of compressor
System low-voltage protection value it is different, by taking plate heat exchanger as an example, low-pressure system protection value is generally chosen to be -1 DEG C.In this implementation
In example, Y1Preferably 8 DEG C.It should be noted that during being detected to compressor, low pressure parameter value Y1With it is real-time
Low voltage value actually pressure value, but be indicated in the presence of inconvenient due to the use of pressure value, therefore those of skill in the art are right
It is described using the temperature of corresponding refrigerant under the pressure value when above-mentioned two value is described, therefore low pressure is joined
The unit of numerical value and real-time pressure value is all DEG C, and to be also those skilled in the art can understand such description method.
When compressor operating time 120s≤T≤600s, pressure sensor starts the real-time low pressure to compressor air suction mouth
Value X is detected, and real-time low voltage value X is transferred to the control device of air-conditioning, and control device fills real-time low voltage value X and control
Set the low pressure parameter value Y of middle storage1It is compared.Due to Y1It is preferred that 8 DEG C, therefore, as 8 DEG C of X <, gas by-passing valve is opened, and will be pressed
The refrigerant of contracting machine exhaust outlet (i.e. high-pressure side) is delivered to compressor air suction mouth (i.e. low-pressure side) by gas by-passing valve, improves compression
Pressure at machine air entry position, prevents compressor air suction mouth hypotony, low-voltage variation state occurs.As 8 DEG C of X >, say
Pressure at bright compressor air suction mouth does not have too low, and in relatively stable level, then gas by-passing valve remains off.
Delivery temperature meanwhile in this phase process, while to compressor air-discharging hole and/or compression case top temperature M
It is detected, can both indicate the delivery temperature of compressor, characterize the working condition of compressor.In specific operation process
In, only the delivery temperature in compressor air-discharging hole can be detected, only the temperature on compression case top can also be detected,
In actual mechanical process, since temperature difference between the two is few, the temperature both given tacit consent to is identical, all use M into
Row indicates.Preferably, the delivery temperature to compressor air-discharging hole and compression case top temperature are carried out at the same time detection, using examining simultaneously
The mode of survey can ensure the accuracy of data, when a sensor in above-mentioned the two is due to can not surprisingly obtain data,
Another sensor can also obtain data, to complete entire control process, lifting system reliability.Number as one preferred
According to processing mode, when the temperature difference between the delivery temperature and compression case top temperature in compressor air-discharging hole differs less than 3 DEG C of ranges
Interior, the two can also be averaged the numerical value as M by the numerical value relatively high using temperature value as the numerical value of M.Pass through detection
When the temperature M of acquisition is in different temperatures range, control device control compressor is worked using different methods, specific point
For three phases.
(1) work as t1≤M≤t2When
Wherein, t1Value be Z-2 Δs1- 1, t2Value be Z-2 Δs2- 1, t1And t2Unit be DEG C that Z is according to compression
Machine exhaust protection temperature determines, it is generally the case that Z is 118 DEG C.In the present embodiment, preferably t1It is 103 DEG C, t2It is 107 DEG C.
In this stage, the delivery temperature of compressor is slightly higher than normal operating conditions, the compression of control device control at this time
Machine is worked using level-one limit frequency operating mode.In the case where level-one limits frequency operating mode, control device will control the work of compressor
Working frequency does not allow the working frequency of compressor to continue growing, and air conditioner refrigeration effect is declined at this time.
(2) work as t2< M < t3When
Wherein, t3Value be Z, Z according to compressor air-discharging protect temperature determine, preferably 118 DEG C.
If the delivery temperature or shell top temperature in compressor air-discharging hole continued to rise within the temperature range of this stage, control
Device control compressor processed carries out two level limit frequency and works and by-passing valve is forbidden to open.In the case where two level limits frequency operating mode, control dress
Setting control compressor reduces the work of its working frequency, in addition, it is compressor air suction mouth that cannot open gas by-passing valve under this stage
Carry out boost operations.
Herein, it should be noted that taken after the delivery temperature and compression case top temperature detection to compressor air-discharging hole
Control method compared to the control method determined according to compressor operating time span have priority control.For example, when pressure
Force snesor detects that real-time 8 DEG C of the low voltage value X < at compressor air suction mouth, control device control gas by-passing valve and open；Meanwhile
When detecting that the delivery temperature of compressor is within the scope of 107 DEG C of 118 DEG C of < M <, when control device forbids gas by-passing valve to open,
At this point, executing the instruction that gas by-passing valve is closed.
(3) as M >=t3When
This stage, the excessive discharge temperature of compressor, it is meant that compressor operating temperature has had exceeded normal range (NR), this
When, control device needs control compressor to lose no time to shut down.If control device controls compressor shutdown, compressor not in time
It will break down shutdown because operating temperature is excessively high.Even if compressor not because high temperature break down shutdown if can be because of high temperature
The compressor lost of life is caused, compressor operating reliability is reduced.
Phase III, T > T2
As T > 600s, compressor enters normal operating phase, and control device is by collected compressor air suction mouth at this time
Real-time low voltage value X and the low pressure parameter value Y that is stored in control device2It is compared, Y2Value be W+2 Δs4+ 1, unit：
DEG C, Δ4Value range is 1-2, is preferably 4 DEG C in the present embodiment.
When X≤4 DEG C, control device controls gas by-passing valve and opens, and the gaseous coolant of exhaust outlet of compressor is delivered to pressure
Contracting machine air entry improves the pressure value at compressor air suction mouth, prevents low-voltage variation state from occurring.
As 4 DEG C of X >, control device controls gas by-passing valve and closes, and is connected between compressor air suction mouth and exhaust outlet.
Low pressure reference value Y1More than low pressure reference value Y2, so as to more effectively prevent low-voltage variation state from occurring, ensure pressure
Contracting machine operation stability and reliability.
If Fig. 3 is controlled down using the control method in the present embodiment, the system operation figure of compressor, Fig. 4 is to adopt
It is controlled down with control method in the prior art, the system operation figure of compressor.It is compared from the two as can be seen that using existing
When having the control method in technology to be controlled, compressor operating will appear low-voltage variation state afterwards for a period of time, but use this
When control method in embodiment is controlled, compressor is not in low-voltage variation state, and compressor overall operation is normal.
In addition, since the control method in the application is different according to compressor operating time length, it is provided with two low pressure
Parameter value, the criterion that different phase opens gas by-passing valve is different, so as to effectively prevent gas by-passing valve turn-on overshoot
Phenomenon occurs.If gas by-passing valve turn-on overshoot, just have it is more by the increased high-pressure gaseous refrigerant of compressor from
Exhaust outlet of compressor is flowed to compressor air suction mouth, is caused compressor to do many idle works, is caused complete machine efficiency low, and this Shen
This phenomenon please but can be effectively avoided to generate.
Embodiment two
Present embodiment discloses a kind of heat pump system, it is provided with compressor on the refrigerant flow of heat pump system, in compressor
Suction line and gas exhaust piping between be provided with bypass branch, be provided with gas by-passing valve on bypass branch, heat pump system tool
There are heating mode and refrigeration mode.Heat pump system in the present embodiment is controlled using the control method in embodiment one, because
This, the heat pump system in the present embodiment has higher use reliability and safety.
Those skilled in the art will readily recognize that under the premise of not conflicting, above-mentioned each preferred embodiment can be free
Ground combination, superposition.
The foregoing is merely the preferred embodiment of the present invention, are not intended to restrict the invention, for those skilled in the art
For, the present invention can have various modifications and changes.It is all within spirit and principles of the present invention made by any modification, equivalent
Replace, improve etc., it should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of control method of heat pump system, it is provided with compressor on the refrigerant flow of the heat pump system, in the compression
It is provided with bypass branch between the suction line and gas exhaust piping of machine, gas by-passing valve is provided on the bypass branch, it is described
Heat pump system has heating mode and refrigeration mode, which is characterized in that the control method includes：
After the heat pump system carries out pattern switching, the real-time low voltage value X of compressor air suction mouth is detected；
As working time length of the compressor after pattern switching is different, using different low pressure parameter value Y as judgement
Standard is compared with the real-time low voltage value X, if the real-time low voltage value X be less than the low pressure parameter value Y, control described in
Gas by-passing valve is opened；
If the real-time low voltage value X is greater than or equal to the low pressure parameter value Y, controls the gas by-passing valve and close；
Wherein, when the compressor is in high-low pressure establishment stage early period, the delivery temperature M of compressor is detected, root
The compressor is controlled according to the case where the delivery temperature M.
2. the control method of heat pump system according to claim 1, which is characterized in that carry out pattern in the heat pump system
After switching and the predetermined time T that works on1Afterwards, the real-time low voltage value X of compressor air suction mouth is detected.
3. the control method of heat pump system according to claim 1 or 2, which is characterized in that when the work of the compressor
Between be T,
As 0 < T < T1When, the real-time low voltage value X of compressor air suction mouth is not detected；
Work as T1≤T≤T2When, the low pressure reference value as criterion is Y1, the real-time low voltage value X of compressor air suction mouth is carried out
Detection, judges whether the real-time low voltage value X is less than low pressure parameter value Y1, if so, gas by-passing valve is opened, if it is not, then by gas
Port valve is closed；
As T > T2When, the low pressure reference value as criterion is Y2, the real-time low voltage value X of compressor air suction mouth is examined
It surveys, judges whether the real-time low voltage value X is less than low pressure parameter value Y2, if so, gas by-passing valve is opened, if it is not, then gas bypasses
Valve is closed；
Wherein, Y1More than Y2。
4. the control method of heat pump system according to claim 3, which is characterized in that work as T1≤T≤T2When, the compression
Machine is in high-low pressure establishment stage early period, is detected to the delivery temperature M of compressor, the case where according to the delivery temperature M
The compressor is controlled.
5. the control method of heat pump system according to claim 4, which is characterized in that the delivery temperature M passes through detection
The temperature of the gas vent of compressor and/or the temperature on compression case top obtain.
6. the control method of heat pump system according to claim 4, which is characterized in that
Work as t1≤M≤t2When, control compressor carries out limit frequency and works；
Work as t2< M < t3When, control compressor carries out frequency reducing work and gas by-passing valve is forbidden to open；
As M >=t3When, control compressor shutdown.
7. the control method of heat pump system according to claim 6, which is characterized in that
When real-time low voltage value X is less than the low pressure parameter value Y1When, and the delivery temperature t of compressor2< M < t3When, by the gas
Port valve is closed.
8. the control method of heat pump system according to claim 6, which is characterized in that the t1Value be Z-2 Δs1- 1,
Unit：DEG C, Δ1Value range be 6-8, and/or,
The t2Value be Z-2 Δs2- 1, unit：DEG C, Δ2Value range be 4-5, and/or,
The t3Value be Z, Z according to compressor air-discharging protect temperature determine.
9. the control method of heat pump system according to claim 3, which is characterized in that the T1Value range be 90-
150s, and/or,
The T2Value range be 450-750s and/or,
The Y1Value be W+2 Δs3+ 1, unit：DEG C, Δ3Value range be 3-5；And/or
The Y2Value be W+2 Δs4+ 1, unit：DEG C, Δ4Value range is 1-2；
Wherein, W is the system low-voltage protection value of compressor.
10. a kind of heat pump system, it is provided with compressor on the refrigerant flow of the heat pump system, in the air intake duct of the compressor
It is provided with bypass branch between road and gas exhaust piping, gas by-passing valve, the heat pump system tool are provided on the bypass branch
There are heating mode and refrigeration mode, which is characterized in that the heat pump system uses heat as described in any one of claim 1 to 9
The control method of pumping system is controlled.
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| CN109186145A (en) * | 2018-08-17 | 2019-01-11 | 佛山市澳霆环境设备制造有限公司 | It is a kind of to prevent refrigeration system of the compressor air suction with liquid |
| CN109282516B (en) * | 2018-09-05 | 2020-06-26 | 珠海格力电器股份有限公司 | Air-cooled screw unit and control method thereof |
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| CN109140840A (en) * | 2018-11-02 | 2019-01-04 | 西安交通大学 | A kind of air conditioner and control method using suction and discharge bypass line |
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| EP0937950B1 (en) * | 1998-02-23 | 2004-10-20 | Mitsubishi Denki Kabushiki Kaisha | Air conditioner |
| JP2009041845A (en) * | 2007-08-09 | 2009-02-26 | Panasonic Corp | Operation control method of multi-room type air conditioner |
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| CN104848587B (en) * | 2014-02-18 | 2017-04-12 | 青岛海信日立空调系统有限公司 | Frequency conversion multi-connected type heat pump system and control method of bypass electronic expansion valve |
| CN104896821A (en) * | 2015-05-19 | 2015-09-09 | 合肥天鹅制冷科技有限公司 | Refrigerating system energy adjusting device |
| CN105444448B (en) * | 2015-12-23 | 2018-02-06 | 广东美的暖通设备有限公司 | refrigeration system and its control method |
| CN106595158A (en) * | 2016-12-22 | 2017-04-26 | 重庆美的通用制冷设备有限公司 | Low-pressure control method, system and air conditioner for unit refrigeration system |
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