CN107906807A - A kind of control method of coolant injection, control system and air conditioner - Google Patents
A kind of control method of coolant injection, control system and air conditioner Download PDFInfo
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- CN107906807A CN107906807A CN201711054149.8A CN201711054149A CN107906807A CN 107906807 A CN107906807 A CN 107906807A CN 201711054149 A CN201711054149 A CN 201711054149A CN 107906807 A CN107906807 A CN 107906807A
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- temperature
- rate
- coolant injection
- temperature change
- heat exchanger
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B45/00—Arrangements for charging or discharging refrigerant
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
Abstract
The present invention proposes a kind of control method of coolant injection, control system and air conditioner, wherein, the control method of coolant injection includes：Obtain system pressure parameter；When system pressure parameter is less than preset pressure parameter, control coolant injection valve carries out first stage filling；Obtain the rate of temperature change of heat exchanger tube temperature；According to the rate of temperature change of heat exchanger tube temperature, control coolant injection valve is filled into second stage.The control method of coolant injection provided by the invention, without artificial judgment and operation, when coolant quantity in refrigerant tank is relatively low, the i.e. quick filling of first stage filling can be carried out according to system pressure state modulator coolant injection valve by starting without air-conditioning system, it ensure that the rapidity of coolant injection, controlled at the same time according to the rate of temperature change of heat exchanger tube temperature and open the i.e. accurate filling of second stage filling, it ensure that the accuracy of coolant injection, solve the problems, such as that artificial judgment is wasted with the time caused by operation, accuracy is low, easy infringement lifetime of system.
Description
Technical field
The present invention relates to coolant injection technical field, is in particular to a kind of control method of coolant injection, control
System and air conditioner.
Background technology
In correlation technique, heat pump type air conditioning system is intelligent, the mounting technique demand of facilitation is increasingly urgent.Simple and efficient
On the one hand mounting technique can save installation work-hour, on the other hand can be to avoid artificial error.Need to add refrigerant to pipe arrangement
For air-conditioning system, by taking multi-gang air-conditioner unit as an example, quick, intelligent additional pipe arrangement refrigerant becomes technology in the urgent need to address
Point.Existing processing mode is usually that the problems such as manually weight calculation adds, and time-consuming, error-prone is big hidden as in project installation one
Disease, meanwhile, under the installation situation of part, directly start fills refrigerant to operating personnel in the case of system cold medium shortage, to system
Infringement is produced, influences lifetime of system.
The content of the invention
It is contemplated that at least solve one of technical problem present in the prior art or correlation technique.
For this reason, the first aspect of the invention is to propose a kind of control method of coolant injection.
The second aspect of the invention is to propose a kind of control system of coolant injection.
The third aspect of the invention is to propose a kind of air conditioner.
In view of this, according to the first aspect of the invention, it is proposed that a kind of control method of coolant injection, for air-conditioning
Device, air conditioner include air-conditioner outdoor unit, refrigerant tank, coolant injection valve and Tube Sheet of Heat Exchanger temperature sensor, coolant injection valve and refrigerant
Tank is connected to control refrigerant to inject refrigerant tank, and the control method of coolant injection includes：Obtain system pressure parameter；When system pressure
When force parameter is less than preset pressure parameter, control coolant injection valve carries out first stage filling；Obtain the temperature of heat exchanger tube temperature
Change rate；According to the rate of temperature change of heat exchanger tube temperature, control coolant injection valve is filled into second stage.
The control method of coolant injection provided by the invention, obtains system pressure parameter, when system pressure parameter is less than pre-
If during pressure parameter, illustrating that the coolant quantity in refrigerant tank is less, it is necessary to be filled, at this moment control coolant injection valve to open and carry out
First stage fills；The rate of temperature change of heat exchanger tube temperature is obtained in real time, controls coolant injection valve to enter according to rate of temperature change
Second stage fills, wherein, first stage filling is quick filling, enables the coolant quantity fast lifting in refrigerant tank, at the same time
System pressure parameter is judged, it is ensured that system will not start shooting under too low pressure state operates filling refrigerant, second-order
Section filling fills to be accurate, the accurate filling for controlling the coolant quantity in refrigerant tank.The present invention fills the refrigerant of air-conditioning system automatically
Note process is divided into the first filling stage and the second filling stage, without artificial judgment and operation, coolant quantity in refrigerant tank compared with
When low, starting without air-conditioning system can be i.e. quick according to the progress first stage filling of system pressure state modulator coolant injection valve
Filling, ensure that the rapidity of coolant injection, while control unlatching second stage to fill according to the rate of temperature change of heat exchanger tube temperature
Note is accurate filling, ensure that the accuracy of coolant injection, time waste, accuracy caused by solving artificial judgment and operation
The problem of low, easy infringement lifetime of system.
The control method of above-mentioned coolant injection according to the present invention, can also have following technical characteristic：
In the above-mentioned technical solutions, it is preferable that obtain the rate of temperature change of the heat exchanger tube temperature；According to heat exchanger tube temperature
The rate of temperature change of temperature, control coolant injection valve enter the step of second stage fills, specifically include：Obtained with predeterminated frequency
Heat exchanger tube temperature temperature；Calculate the rate of temperature change of heat exchanger tube temperature；Judge whether rate of temperature change is less than preset temperature and changes
Rate；When rate of temperature change is less than preset temperature change rate, control coolant injection valve is filled into second stage；Work as temperature change
When rate is more than or equal to preset temperature change rate, returns and continue to obtain heat exchanger tube temperature temperature with predeterminated frequency.
In the technical scheme, heat exchanger tube temperature temperature is obtained with predeterminated frequency, and calculates rate of temperature change, further sentenced
Whether disconnected rate of temperature change is less than preset temperature change rate, when rate of temperature change is less than preset temperature change rate, illustrates first
The filling process in stage then controls coolant injection valve accurately to fill into the second filling stage already close to saturation；When temperature becomes
When rate is more than or equal to preset temperature change rate, illustrate that the filling process of first stage is also not close to saturation, it is necessary to continue fast
Speed filling, then continue to obtain heat exchanger tube temperature temperature with predeterminated frequency, so as to ensure that the filling process of only first stage connects
Nearly saturation, when the coolant quantity in refrigerant tank reaches certain amount, system just entered for the second filling stage, ensure that the first filling rank
The filling rapidity of section.
In any of the above-described technical solution, it is preferable that according to the rate of temperature change of heat exchanger tube temperature, control coolant injection valve
After the step of being filled into second stage, further include：Obtain delivery temperature and pressure at expulsion；When delivery temperature and pressure at expulsion
When the difference of corresponding saturation temperature is in pre-set interval, control coolant injection valve, which is closed, terminates second stage filling.
In the technical scheme, after system enters second stage, when delivery temperature saturation temperature corresponding with pressure at expulsion
Difference when being in pre-set interval, illustrate refill refrigerant in refrigerant tank, then control coolant injection valve to close, stop
Second stage fills, and ensure that the accuracy of second stage filling, prevents that filling is excessive.
In any of the above-described technical solution, it is preferable that before the step of control coolant injection valve carries out first stage filling,
Further include：Air conditioner is evacuated to vacuum state.
In the technical scheme, air conditioner is evacuated to vacuum state, prevents the pressure at expulsion and delivery temperature mistake of air conditioner
Height, ensures that the performance of air conditioner is unaffected.
In any of the above-described technical solution, it is preferable that the rate of temperature change of heat exchanger tube temperature is current heat exchanger tube temperature temperature
Degree and the heat exchanger tube temperature temperature difference of preceding one-time detection and the ratio of predeterminated frequency.
In the technical scheme, by calculating the rate of temperature change of heat exchanger tube temperature, further according to rate of temperature change control
Refrigeration matchmaker's charging valve was turned down into the second filling stage, so as to ensure the progress of automatic filling process.
The second aspect of the invention, it is proposed that a kind of control system of coolant injection, for air conditioner, air conditioner includes
Air-conditioner outdoor unit, refrigerant tank, coolant injection valve and Tube Sheet of Heat Exchanger temperature sensor, the control system of coolant injection include：First obtains
Unit is taken, for obtaining system pressure parameter；First control unit, for being less than preset pressure parameter when system pressure parameter
When, control coolant injection valve carries out first stage filling；Second acquisition unit, for obtaining the temperature change of heat exchanger tube temperature
Rate；Second control unit, for the rate of temperature change according to heat exchanger tube temperature, control coolant injection valve is filled into second stage
Note.
The control system of coolant injection provided by the invention, obtains system pressure parameter, when system pressure parameter is less than pre-
If during pressure parameter, illustrating that the coolant quantity in refrigerant tank is less, it is necessary to be filled, at this moment control coolant injection valve to open and carry out
First stage fills；The rate of temperature change of heat exchanger tube temperature is obtained in real time, controls coolant injection valve to enter according to rate of temperature change
Second stage fills, wherein, first stage filling is quick filling, enables the coolant quantity fast lifting in refrigerant tank, at the same time
System pressure parameter is judged, it is ensured that system will not start shooting under too low pressure state operates filling refrigerant, second-order
Section filling fills to be accurate, the accurate filling for controlling the coolant quantity in refrigerant tank.The present invention fills the refrigerant of air-conditioning system automatically
Note process is divided into the first filling stage and the second filling stage, without artificial judgment and operation, coolant quantity in refrigerant tank compared with
When low, starting without air-conditioning system can be i.e. quick according to the progress first stage filling of system pressure state modulator coolant injection valve
Filling, ensure that the rapidity of coolant injection, while control unlatching second stage to fill according to the rate of temperature change of heat exchanger tube temperature
Note is accurate filling, ensure that the accuracy of coolant injection, time waste, accuracy caused by solving artificial judgment and operation
The problem of low, easy infringement lifetime of system.
The control system of above-mentioned coolant injection according to the present invention, can also have following technical characteristic：
In the above-mentioned technical solutions, it is preferable that second acquisition unit, specifically includes：3rd acquiring unit, for default
Frequency acquisition heat exchanger tube temperature temperature；Computing unit, for calculating the rate of temperature change of heat exchanger tube temperature；Second control unit,
Specifically include：Judging unit, for judging whether rate of temperature change is less than preset temperature change rate；3rd control unit, is used for
When rate of temperature change is less than preset temperature change rate, control coolant injection valve carries out second stage filling；And when temperature becomes
When rate is more than or equal to preset temperature change rate, returns and continue to obtain heat exchanger tube temperature temperature with predeterminated frequency.
In the technical scheme, heat exchanger tube temperature temperature is obtained with predeterminated frequency, and calculates rate of temperature change, further sentenced
Whether disconnected rate of temperature change is less than preset temperature change rate, when rate of temperature change is less than preset temperature change rate, illustrates first
The filling process in stage then controls coolant injection valve accurately to fill into the second filling stage already close to saturation；When temperature becomes
When rate is more than or equal to preset temperature change rate, illustrate that the filling process of first stage is also not close to saturation, it is necessary to continue fast
Speed filling, then continue to obtain heat exchanger tube temperature temperature with predeterminated frequency, so as to ensure that the filling process of only first stage connects
Nearly saturation, when the coolant quantity in refrigerant tank reaches certain amount, system just entered for the second filling stage, ensure that the first filling rank
The filling rapidity of section.
In any of the above-described technical solution, it is preferable that the second control unit, further includes：4th acquiring unit, for when temperature
When degree change rate is less than preset temperature change rate, delivery temperature and pressure at expulsion are obtained；4th control unit, for when exhaust temperature
When degree be in pre-set interval with the difference of the corresponding saturation temperature of pressure at expulsion, the closing of coolant injection valve is controlled.
In the technical scheme, after system enters second stage, when delivery temperature saturation temperature corresponding with pressure at expulsion
Difference when being in pre-set interval, illustrate refill refrigerant in refrigerant tank, then control coolant injection valve to close, stop
Second stage fills, and ensure that the accuracy of second stage filling, prevents that filling is excessive.
In any of the above-described technical solution, it is preferable that before the step of control coolant injection valve carries out first stage filling,
Air conditioner is evacuated to vacuum state.
In the technical scheme, air conditioner is evacuated to vacuum state, prevents the pressure at expulsion and delivery temperature mistake of air conditioner
Height, ensures that the performance of air conditioner is unaffected.
In any of the above-described technical solution, it is preferable that the rate of temperature change of heat exchanger tube temperature is current heat exchanger tube temperature temperature
Degree and the heat exchanger tube temperature temperature difference of preceding one-time detection and the ratio of predeterminated frequency.
In the technical scheme, by calculating the rate of temperature change of heat exchanger tube temperature, further according to rate of temperature change control
Refrigeration matchmaker's charging valve was turned down into the second filling stage, so as to ensure the progress of automatic filling process.
A kind of the third aspect of the invention, it is proposed that the coolant injection in air conditioner, including any of the above-described technical solution
Control system.
Air conditioner according to the present invention, includes the control system of above-mentioned coolant injection, thus possesses the control of the coolant injection
Whole beneficial effects of system processed, details are not described herein.
The additional aspect and advantage of the present invention will become obvious in following description section, or the practice by the present invention
Recognize.
Brief description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become in the description from combination accompanying drawings below to embodiment
Substantially and it is readily appreciated that, wherein：
Fig. 1 shows the control method flow chart of the coolant injection of one embodiment of the present of invention；
Fig. 2 shows the control method flow diagram of the coolant injection of an alternative embodiment of the invention；
Fig. 3 shows the control method flow diagram of the coolant injection of yet another embodiment of the present invention；
Fig. 4 a show the schematic block diagram of the control system of the coolant injection of one embodiment of the present of invention；
Fig. 4 b show the control system schematic block diagram of the coolant injection of an alternative embodiment of the invention；
Fig. 4 c show the control system schematic block diagram of the coolant injection of yet another embodiment of the present invention.
Embodiment
It is to better understand the objects, features and advantages of the present invention, below in conjunction with the accompanying drawings and specific real
Mode is applied the present invention is further described in detail.It should be noted that in the case where there is no conflict, the implementation of the application
Feature in example and embodiment can be mutually combined.
Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still, the present invention may be used also
To be implemented using other different from other modes described here, therefore, protection scope of the present invention is not limited to following public affairs
The limitation for the specific embodiment opened.
The embodiment of first aspect present invention, proposes a kind of control method of coolant injection, for air conditioner, air conditioner bag
Air-conditioner outdoor unit, refrigerant tank, coolant injection valve and Tube Sheet of Heat Exchanger temperature sensor are included, coolant injection valve is connected with refrigerant tank to control
Matchmaker of freezing injects refrigerant tank, and Fig. 1 shows the control method flow chart of the coolant injection of one embodiment of the present of invention.Refrigerant fills
The control method of note includes：
Step 102, system pressure parameter is obtained；
Step 104, when system pressure parameter is less than preset pressure parameter, the control coolant injection valve progress first stage fills
Note；
Step 106, the rate of temperature change of heat exchanger tube temperature is obtained；
Step 108, filled according to the rate of temperature change of heat exchanger tube temperature, control coolant injection valve into second stage.
The control method of coolant injection provided by the invention, obtains system pressure parameter, when system pressure parameter is less than pre-
If during pressure parameter, illustrating that the coolant quantity in refrigerant tank is less, it is necessary to be filled, at this moment control coolant injection valve to open and carry out
First stage fills；The rate of temperature change of heat exchanger tube temperature is obtained in real time, controls coolant injection valve to enter according to rate of temperature change
Second stage fills, wherein, first stage filling is quick filling, enables the coolant quantity fast lifting in refrigerant tank, at the same time
System pressure parameter is judged, it is ensured that system will not start shooting under too low pressure state operates filling refrigerant, second-order
Section filling fills to be accurate, the accurate filling for controlling the coolant quantity in refrigerant tank.The present invention fills the refrigerant of air-conditioning system automatically
Note process is divided into the first filling stage and the second filling stage, without artificial judgment and operation, coolant quantity in refrigerant tank compared with
When low, starting without air-conditioning system can be i.e. quick according to the progress first stage filling of system pressure state modulator coolant injection valve
Filling, ensure that the rapidity of coolant injection, while control unlatching second stage to fill according to the rate of temperature change of heat exchanger tube temperature
Note is accurate filling, ensure that the accuracy of coolant injection, time waste, accuracy caused by solving artificial judgment and operation
The problem of low, easy infringement lifetime of system.
Fig. 2 shows the control method flow chart of the coolant injection of an alternative embodiment of the invention.The control of coolant injection
Method processed includes：
Step 202, system pressure parameter is obtained；
Step 204, when system pressure parameter is less than preset pressure parameter, the control coolant injection valve progress first stage fills
Note；
Step 206, heat exchanger tube temperature temperature is obtained with predeterminated frequency；
Step 208, the rate of temperature change of heat exchanger tube temperature is calculated；
Step 210, judge whether rate of temperature change is less than preset temperature change rate；Preset when rate of temperature change is more than or equal to
During rate of temperature change, return to step 206；
Step 212, when rate of temperature change is less than preset temperature change rate, control coolant injection valve is filled into second stage
Note.
In this embodiment, heat exchanger tube temperature temperature is obtained with predeterminated frequency, and calculates rate of temperature change, determined whether
Whether rate of temperature change is less than preset temperature change rate, when rate of temperature change is less than preset temperature change rate, illustrates the first rank
The filling process of section then controls coolant injection valve accurately to fill into the second filling stage already close to saturation；Work as temperature change
When rate is more than or equal to preset temperature change rate, illustrate that the filling process of first stage is also not close to saturation, it is necessary to continue quick
Filling, then continue to obtain heat exchanger tube temperature temperature with predeterminated frequency, so as to ensure that the filling process of only first stage approaches
Saturation, when the coolant quantity in refrigerant tank reaches certain amount, system just entered for the second filling stage, ensure that for the first filling stage
Filling rapidity.
Fig. 3 shows the control method flow chart of the coolant injection of yet another embodiment of the present invention.The control of coolant injection
Method processed includes：
Step 302, system pressure parameter is obtained；
Step 304, when system pressure parameter is less than preset pressure parameter, the control coolant injection valve progress first stage fills
Note；
Step 306, heat exchanger tube temperature temperature is obtained with predeterminated frequency；
Step 308, the rate of temperature change of heat exchanger tube temperature is calculated；
Step 310, judge whether rate of temperature change is less than preset temperature change rate；Preset when rate of temperature change is more than or equal to
During rate of temperature change, return to step 306；
Step 312, when rate of temperature change is less than preset temperature change rate, control coolant injection valve is filled into second stage
Note；
Step 314, delivery temperature and pressure at expulsion are obtained；
Step 316, when the difference of delivery temperature and the corresponding saturation temperature of pressure at expulsion is in pre-set interval, refrigerant is controlled
Charging valve, which is closed, terminates second stage filling.
In this embodiment, system enter second stage after, when delivery temperature saturation temperature corresponding with pressure at expulsion it
Difference illustrate refill refrigerant in refrigerant tank when be in pre-set interval, then controls the closing of coolant injection valve, stopping the
Two-stage fills, and ensure that the accuracy of second stage filling, prevents that filling is excessive.
In one embodiment of the invention, it is preferable that the step of control coolant injection valve carries out first stage filling it
Before, further include：Air conditioner is evacuated to vacuum state.
In this embodiment, air conditioner is evacuated to vacuum state, prevents the pressure at expulsion and excessive discharge temperature of air conditioner,
Ensure that the performance of air conditioner is unaffected.
In one embodiment of the invention, it is preferable that the rate of temperature change of heat exchanger tube temperature is current heat exchanger tube temperature
Temperature and the heat exchanger tube temperature temperature difference of preceding one-time detection and the ratio of predeterminated frequency.
In this embodiment, by calculating the rate of temperature change of heat exchanger tube temperature, further controlled according to rate of temperature change
Coolant injection valve was turned down into the second filling stage, so as to ensure the progress of automatic filling process.
The embodiment of second aspect of the present invention, proposes a kind of control system of coolant injection, for air conditioner, air-conditioning
Device includes air-conditioner outdoor unit, refrigerant tank, coolant injection valve and Tube Sheet of Heat Exchanger temperature sensor, and Fig. 4 a show the reality of the present invention
Apply the schematic block diagram of the control system of the coolant injection of example.The control system 400 of coolant injection includes：
First acquisition unit 402, for obtaining system pressure parameter；
First control unit 404, for when system pressure parameter is less than preset pressure parameter, control coolant injection valve into
The row first stage fills；
Second acquisition unit 406, for obtaining the rate of temperature change of heat exchanger tube temperature；
Second control unit 408, for the rate of temperature change according to heat exchanger tube temperature, control coolant injection valve enters second
Stage fills.
The control system of coolant injection provided by the invention, obtains system pressure parameter, when system pressure parameter is less than pre-
If during pressure parameter, illustrating that the coolant quantity in refrigerant tank is less, it is necessary to be filled, at this moment control coolant injection valve to open and carry out
First stage fills；The rate of temperature change of heat exchanger tube temperature is obtained in real time, controls coolant injection valve to enter according to rate of temperature change
Second stage fills, wherein, first stage filling is quick filling, enables the coolant quantity fast lifting in refrigerant tank, at the same time
System pressure parameter is judged, it is ensured that system will not start shooting under too low pressure state operates filling refrigerant, second-order
Section filling fills to be accurate, the accurate filling for controlling the coolant quantity in refrigerant tank.The present invention fills the refrigerant of air-conditioning system automatically
Note process is divided into the first filling stage and the second filling stage, without artificial judgment and operation, coolant quantity in refrigerant tank compared with
When low, starting without air-conditioning system can be i.e. quick according to the progress first stage filling of system pressure state modulator coolant injection valve
Filling, ensure that the rapidity of coolant injection, while control unlatching second stage to fill according to the rate of temperature change of heat exchanger tube temperature
Note is accurate filling, ensure that the accuracy of coolant injection, time waste, accuracy caused by solving artificial judgment and operation
The problem of low, easy infringement lifetime of system.
Fig. 4 b show the schematic block diagram of the control system of the coolant injection of an alternative embodiment of the invention.Coolant injection
Control system 400 include：
First acquisition unit 402, for obtaining system pressure parameter；
First control unit 404, for when system pressure parameter is less than preset pressure parameter, control coolant injection valve into
The row first stage fills；
Second acquisition unit 406, for obtaining the rate of temperature change of heat exchanger tube temperature；
Second acquisition unit 406, specifically includes：
3rd acquiring unit 4062, for obtaining heat exchanger tube temperature temperature with predeterminated frequency；
Computing unit 4064, for calculating the rate of temperature change of heat exchanger tube temperature；
Second control unit 408, for the rate of temperature change according to heat exchanger tube temperature, control coolant injection valve enters second
Stage fills；
Second control unit 408, specifically includes：
Judging unit 4082, for judging whether rate of temperature change is less than preset temperature change rate；
3rd control unit 4084, for when rate of temperature change is less than preset temperature change rate, controlling coolant injection valve
Carry out second stage filling；And
When rate of temperature change is more than or equal to preset temperature change rate, returns and continue to obtain heat exchanger tube temperature with predeterminated frequency
Temperature.
In this embodiment, heat exchanger tube temperature temperature is obtained with predeterminated frequency, and calculates rate of temperature change, determined whether
Whether rate of temperature change is less than preset temperature change rate, when rate of temperature change is less than preset temperature change rate, illustrates the first rank
The filling process of section then controls coolant injection valve accurately to fill into the second filling stage already close to saturation；Work as temperature change
When rate is more than or equal to preset temperature change rate, illustrate that the filling process of first stage is also not close to saturation, it is necessary to continue quick
Filling, then continue to obtain heat exchanger tube temperature temperature with predeterminated frequency, so as to ensure that the filling process of only first stage approaches
Saturation, when the coolant quantity in refrigerant tank reaches certain amount, system just entered for the second filling stage, ensure that for the first filling stage
Filling rapidity.
Fig. 4 c show the schematic block diagram of the control system of the coolant injection of yet another embodiment of the present invention.Coolant injection
Control system 400 include：
First acquisition unit 402, for obtaining system pressure parameter；
First control unit 404, for when system pressure parameter is less than preset pressure parameter, control coolant injection valve into
The row first stage fills；
Second acquisition unit 406, for obtaining the rate of temperature change of heat exchanger tube temperature；
Second acquisition unit 406, specifically includes：
3rd acquiring unit 4062, for obtaining heat exchanger tube temperature temperature with predeterminated frequency；
Computing unit 4064, for calculating the rate of temperature change of heat exchanger tube temperature；
Second control unit 408, for the rate of temperature change according to heat exchanger tube temperature, control coolant injection valve enters second
Stage fills；
Second control unit 408, specifically includes：
Judging unit 4082, for judging whether rate of temperature change is less than preset temperature change rate；
3rd control unit 4084, for when rate of temperature change is less than preset temperature change rate, controlling coolant injection valve
Carry out second stage filling；And
When rate of temperature change is more than or equal to preset temperature change rate, returns and continue to obtain heat exchanger tube temperature with predeterminated frequency
Temperature；
4th acquiring unit 4086, for when rate of temperature change is less than preset temperature change rate, obtain delivery temperature and
Pressure at expulsion；
4th control unit 4088, for being in preset areas when the difference of delivery temperature and the corresponding saturation temperature of pressure at expulsion
Between when, control coolant injection valve is closed.
In this embodiment, system enter second stage after, when delivery temperature saturation temperature corresponding with pressure at expulsion it
Difference illustrate refill refrigerant in refrigerant tank when be in pre-set interval, then controls the closing of coolant injection valve, stopping the
Two-stage fills, and ensure that the accuracy of second stage filling, prevents that filling is excessive.
In one embodiment of the invention, it is preferable that the step of control coolant injection valve carries out first stage filling it
Before, air conditioner is evacuated to vacuum state.
In this embodiment, air conditioner is evacuated to vacuum state, prevents the pressure at expulsion and excessive discharge temperature of air conditioner,
Ensure that the performance of air conditioner is unaffected.
In one embodiment of the invention, it is preferable that the rate of temperature change of heat exchanger tube temperature is current heat exchanger tube temperature
Temperature and the heat exchanger tube temperature temperature difference of preceding one-time detection and the ratio of predeterminated frequency.
In this embodiment, by calculating the rate of temperature change of heat exchanger tube temperature, further controlled according to rate of temperature change
Coolant injection valve was turned down into the second filling stage, so as to ensure the progress of automatic filling process.
The embodiment of third aspect present invention, proposes a kind of air conditioner, includes the control of the coolant injection of any of the above-described
System.
Air conditioner according to the present invention, includes the control system of above-mentioned coolant injection, thus possesses the control of the coolant injection
Whole beneficial effects of system processed, details are not described herein.
In the description of this specification, the description of term " one embodiment ", " some embodiments ", " specific embodiment " etc.
Mean to combine at least one reality that the particular features, structures, materials, or characteristics that the embodiment or example describe are contained in the present invention
Apply in example or example.In the present specification, schematic expression of the above terms is not necessarily referring to identical embodiment or reality
Example.Moreover, description particular features, structures, materials, or characteristics can in any one or more embodiments or example with
Suitable mode combines.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the invention, for the skill of this area
For art personnel, the invention may be variously modified and varied.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should all be included in the protection scope of the present invention.
Claims (11)
1. a kind of control method of coolant injection, for air conditioner, the air conditioner includes air-conditioner outdoor unit, refrigerant tank, refrigerant
Charging valve and Tube Sheet of Heat Exchanger temperature sensor, the coolant injection valve are connected with the refrigerant tank to control refrigerant injection described cold
Matchmaker's tank, it is characterised in that the control method of the coolant injection includes：
Obtain system pressure parameter；
When the system pressure parameter is less than preset pressure parameter, the coolant injection valve is controlled to carry out first stage filling；
Obtain the rate of temperature change of the heat exchanger tube temperature；
According to the rate of temperature change of the heat exchanger tube temperature, the coolant injection valve is controlled to be filled into second stage.
2. the control method of coolant injection according to claim 1, it is characterised in that described to obtain the heat exchanger tube temperature
Rate of temperature change；According to the rate of temperature change of the heat exchanger tube temperature temperature, the coolant injection valve is controlled to enter second-order
The step of section filling, specifically include：
Heat exchanger tube temperature temperature is obtained with predeterminated frequency；
Calculate the rate of temperature change of the heat exchanger tube temperature；
Judge whether the rate of temperature change is less than preset temperature change rate；
When the rate of temperature change is less than the preset temperature change rate, the coolant injection valve is controlled to be filled into second stage
Note；
When the rate of temperature change is more than or equal to the preset temperature change rate, returns to continue to obtain with the predeterminated frequency and change
Hot device tube temperature temperature.
3. the control method of coolant injection according to claim 2, it is characterised in that described according to the heat exchanger tube temperature
Rate of temperature change, control the coolant injection valve enter second stage filling the step of after, further include：
Obtain delivery temperature and pressure at expulsion；
When the difference of the delivery temperature and the corresponding saturation temperature of the pressure at expulsion is in pre-set interval, the refrigerant is controlled
Charging valve, which is closed, terminates second stage filling.
4. the control method of coolant injection according to any one of claim 1 to 3, it is characterised in that the control institute
Before stating the step of coolant injection valve carries out first stage filling, further include：
The air conditioner is evacuated to vacuum state.
5. the control method of coolant injection according to any one of claim 1 to 3, it is characterised in that
The rate of temperature change of the heat exchanger tube temperature is current heat exchanger tube temperature temperature and the heat exchanger tube temperature temperature of preceding one-time detection
The difference of degree and the ratio of predeterminated frequency.
6. a kind of control system of coolant injection, for air conditioner, the air conditioner includes air-conditioner outdoor unit, refrigerant tank, refrigerant
Charging valve and Tube Sheet of Heat Exchanger temperature sensor, it is characterised in that the control system of the coolant injection includes：
First acquisition unit, for obtaining system pressure parameter；
First control unit, for when the system pressure parameter is less than preset pressure parameter, controlling the coolant injection valve
Carry out first stage filling；
Second acquisition unit, for obtaining the rate of temperature change of the heat exchanger tube temperature；
Second control unit, for the rate of temperature change according to the heat exchanger tube temperature, controls the coolant injection valve to enter the
Two-stage fills.
7. the control system of coolant injection according to claim 6, it is characterised in that the second acquisition unit, specifically
Including：
3rd acquiring unit, for obtaining heat exchanger tube temperature temperature with predeterminated frequency；
Computing unit, for calculating the rate of temperature change of the heat exchanger tube temperature；
Second control unit, specifically includes：
Judging unit, for judging whether the rate of temperature change is less than preset temperature change rate；
3rd control unit, for when the rate of temperature change is less than the preset temperature change rate, controlling the refrigerant to fill
Note valve and carry out second stage filling；And
When the rate of temperature change is more than or equal to the preset temperature change rate, returns and continue to obtain heat exchanger with predeterminated frequency
Tube temperature temperature.
8. the control system of coolant injection according to claim 7, it is characterised in that second control unit, is also wrapped
Include：
4th acquiring unit, for when the rate of temperature change is less than the preset temperature change rate, obtain delivery temperature and
Pressure at expulsion；
4th control unit, for being in preset areas when the difference of the delivery temperature and the corresponding saturation temperature of the pressure at expulsion
Between when, control the coolant injection valve to close.
9. the control system of the coolant injection according to any one of claim 6 to 8, it is characterised in that
Before the step of control coolant injection valve carries out first stage filling, the air conditioner is evacuated to vacuum shape
State.
10. the control system of the coolant injection according to any one of claim 6 to 8, it is characterised in that
The rate of temperature change of the heat exchanger tube temperature is current heat exchanger tube temperature temperature and the heat exchanger tube temperature temperature of preceding one-time detection
The difference of degree and the ratio of predeterminated frequency.
A kind of 11. air conditioner, it is characterised in that including：
The control system of coolant injection as any one of claim 6 to 10.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115900152A (en) * | 2022-12-08 | 2023-04-04 | 江苏拓米洛高端装备股份有限公司 | Refrigerant filling method and refrigerant filling device |
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