CN111156667A - Control method, device and equipment for air supply loop of air supply enthalpy-increasing compressor - Google Patents
Control method, device and equipment for air supply loop of air supply enthalpy-increasing compressor Download PDFInfo
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- CN111156667A CN111156667A CN202010014597.0A CN202010014597A CN111156667A CN 111156667 A CN111156667 A CN 111156667A CN 202010014597 A CN202010014597 A CN 202010014597A CN 111156667 A CN111156667 A CN 111156667A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
- F24F11/67—Switching between heating and cooling modes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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Abstract
The application provides a control method and related control equipment for an air-supplementing enthalpy-increasing compressor. The method comprises the following steps: determining that the working mode of the compressor is a heating mode, and the control mode is an automatic mode; the method comprises the steps that the opening degree of a main path electronic expansion valve is determined based on an algorithm of the environment temperature corresponding to the opening degree of the main path electronic expansion valve, meanwhile, the algorithm of controlling the exhaust superheat degree by adjusting the opening degree of an air supply loop electronic expansion valve greatly improves the instability and low COP of a system caused by the mode that popular double-loop electronic expansion valves control the superheat degree, enables the efficiency of the system to reach the optimal working point, and improves the COP and the stability of the system; when the working mode of the compressor is a refrigeration mode, a popular control algorithm is adopted.
Description
Technical Field
The application relates to the technical field of air-supply enthalpy-increasing compressors, in particular to a control method, a device and equipment for an air-supply loop of an air-supply enthalpy-increasing compressor.
Background
In the use process of a common household air source heat pump air conditioner, the heat supply amount of the air conditioner is obviously reduced along with the reduction of the outdoor environment temperature during heating in winter, the compression ratio of an air conditioner compressor is increased under the ultralow temperature operation, the exhaust temperature is continuously increased, and the unit is potential safety hazard caused by long-term operation. The heat pump is fast in frosting in low-temperature and high-humidity environment operation, the normal working time is short, cold air can be blown to an indoor air-conditioning room during defrosting, and the comfort is poor. Therefore, a gas-supplementing enthalpy-increasing technology is proposed to improve the operation condition of the system at low temperature.
The vapor-supplementing enthalpy-increasing system is a novel system consisting of a vapor-supplementing enthalpy-increasing compressor, a vapor-supplementing enthalpy-increasing technology and an efficient subcooler, and the combination of the three technologies can provide efficient performance. The system is an organic whole, namely an economizer and a high-efficiency heat exchanger which are formed by a high-efficiency air-supply enthalpy-increasing compressor, a high-efficiency subcooler and an electronic expansion valve jointly form a high-efficiency energy-saving air-supply system.
The air-supplying enthalpy-increasing technology can effectively improve the heating capacity of the system under the low-temperature working condition, prevent the exhaust temperature of the compressor from being too high, and ensure the operation stability of the unit under the low-temperature working condition.
However, the existing air supply loop of the air supply enthalpy-increasing compressor is only controlled more coarsely, namely, the air supply loop is only simply divided into an open state and a closed state. In this control mode, the efficiency of the vapor-filling enthalpy-increasing compressor is very low.
Disclosure of Invention
The present application aims to provide a method for controlling an air-supply loop of an air-supply enthalpy-increasing compressor and related equipment, so as to solve the problems in the related art.
The purpose of the application is realized by the following technical scheme:
based on the first aspect of the application, the application provides a control method of a gas supplementing loop of a gas supplementing enthalpy-increasing compressor, which is applied to the gas supplementing enthalpy-increasing compressor; the control method of the air supply loop of the air supply enthalpy-increasing compressor comprises the following steps:
determining that the working mode of the compressor is a heating mode, and the control mode is an automatic mode;
based on the current environment temperature and historical data of the opening of the electronic expansion valve of the main road, the opening of the electronic expansion valve of the main road is adjusted;
and adjusting the opening degree of the auxiliary electronic expansion valve based on the ambient temperature and the exhaust superheat degree.
Optionally, the method further includes:
acquiring the state of the unit;
when the unit is electrified and the compressor does not run, the opening of the main electronic expansion valve is adjusted to 0 by heat, and the opening of the auxiliary electronic expansion valve is adjusted to 0;
when the unit is powered on and the compressor starts to operate, the opening degree of the main electronic expansion valve is adjusted to the initial opening degree of the main electronic expansion valve through heat, and the opening degree of the auxiliary electronic expansion valve is adjusted to the initial opening degree of the auxiliary electronic expansion valve.
Optionally, the adjusting the opening degree of the main circuit electronic expansion valve based on the current temperature and the historical data of the opening degree of the main circuit electronic expansion valve includes:
calculating the sum of the EXV target opening constant plus the first preset multiple of the environment temperature plus the first preset value to obtain a first opening numerical value;
judging whether the difference value between the first opening degree value and the opening degree value of the main circuit electronic expansion valve in the previous period is within a first preset range or not;
if the judgment result is yes, the opening of the main-path electronic expansion valve is not changed;
and if the judgment result is negative, adjusting the opening numerical value of the main-path electronic expansion valve to the first opening numerical value.
Optionally, the adjusting the opening degree of the auxiliary electronic expansion valve based on the ambient temperature and the exhaust superheat degree includes:
acquiring an actual exhaust superheat value;
judging whether the difference value of the actual exhaust superheat degree value and the preset exhaust superheat degree value is within a second preset range or not;
if the judgment result is yes, the opening degree of the auxiliary electronic expansion valve is not changed;
and if the judgment result is negative, adjusting the opening degree of the auxiliary electronic expansion valve based on the difference value of the actual exhaust superheat degree value and the preset exhaust superheat degree value.
Optionally, the adjusting the opening degree of the auxiliary electronic expansion valve based on the difference between the actual exhaust superheat degree value and the preset exhaust superheat degree value includes:
judging whether the actual exhaust superheat value is larger than a preset exhaust superheat value or not;
if the judgment result is yes, calculating the opening value of the auxiliary electronic expansion valve in the last period, adding the actual exhaust superheat value of the first preset value and the second preset multiple, and subtracting the preset exhaust superheat value of the second preset multiple to obtain a second opening value; adjusting the opening numerical value of the auxiliary electronic expansion valve to the second opening numerical value;
if the judgment result is negative, subtracting the actual exhaust superheat value of the first preset multiple and the actual exhaust superheat value of the second preset multiple from the actual exhaust superheat value of the auxiliary electronic expansion valve of the last period to obtain a third opening value; and adjusting the opening numerical value of the auxiliary electronic expansion valve to the third opening numerical value.
Optionally, the method further includes:
determining the working mode of the compressor as a refrigeration mode;
when the working mode of the compressor is a refrigeration mode, the opening of the main-path electronic expansion valve is adjusted based on the exhaust superheat degree;
determining that the working mode of the compressor is a heating mode, and the control mode is a manual mode;
the method comprises the steps of obtaining opening information of a main electronic expansion valve and opening information of an auxiliary electronic expansion valve, and respectively adjusting the opening of the main electronic expansion valve and the opening of the auxiliary electronic expansion valve based on the opening information of the main electronic expansion valve and the opening information of the auxiliary electronic expansion valve.
Optionally, the adjusting the opening of the main circuit electronic expansion valve based on the exhaust superheat degree includes:
acquiring an actual exhaust superheat value;
judging whether the difference value of the actual exhaust superheat degree value and the preset exhaust superheat degree value is within a third preset range or not;
if the judgment result is yes, the opening of the main-path electronic expansion valve is not changed;
if the judgment result is negative, the opening of the main-path electronic expansion valve is adjusted based on the difference value of the actual exhaust superheat value and the preset exhaust superheat value.
Optionally, the adjusting the opening degree of the main-path electronic expansion valve based on the difference between the actual exhaust superheat degree value and the preset exhaust superheat degree value includes:
judging whether the actual exhaust superheat value is larger than a preset exhaust superheat value or not;
if the judgment result is yes, calculating the opening numerical value of the main-path electronic expansion valve in the last period, adding the actual exhaust superheat numerical value of the first preset value plus the second preset multiple, and subtracting the preset exhaust superheat numerical value of the second preset multiple to obtain a fourth numerical value; adjusting the opening value of the main-path electronic expansion valve to the fourth opening value;
if the judgment result is negative, subtracting the actual exhaust superheat value of the first preset multiple and the actual exhaust superheat value of the second preset multiple from the actual exhaust superheat value of the main-path electronic expansion valve of the last period to obtain a fifth opening value; and adjusting the opening numerical value of the main-path electronic expansion valve to the fifth opening numerical value.
In a second aspect, the present application provides a control device for a vapor-supplying loop of a vapor-supplying enthalpy-increasing compressor, which is disposed in the vapor-supplying enthalpy-increasing compressor; control device of tonifying qi return circuit of tonifying qi enthalpy-increasing compressor includes:
the determining module is used for determining that the working mode of the compressor is a heating mode and the control mode is an automatic mode;
the adjusting module is used for adjusting the opening of the main-path electronic expansion valve based on the current environment temperature and historical data of the opening of the main-path electronic expansion valve;
and the adjusting module is also used for adjusting the opening degree of the auxiliary electronic expansion valve based on the ambient temperature and the exhaust superheat degree.
In a third aspect, a control device for an air supply loop of an air supply enthalpy-increasing compressor is arranged in the air supply enthalpy-increasing compressor; control device of a vapor-filling circuit of a vapor-filling enthalpy-increasing compressor, comprising:
a processor, and a memory coupled to the processor;
the memory is used for storing a computer program;
the processor is configured to call and execute the computer program in the memory to execute the method for controlling the vapor-filling circuit of the vapor-filling enthalpy-increasing compressor according to the first aspect of the present application.
This application adopts above technical scheme, has following beneficial effect:
in the scheme provided by the application, after the working mode of the compressor is determined to be a heating mode and the control mode is an automatic mode; based on the current environment temperature and historical data of the opening of the electronic expansion valve of the main road, the opening of the electronic expansion valve of the main road is adjusted; and adjusting the opening degree of the auxiliary electronic expansion valve based on the ambient temperature and the exhaust superheat degree. Compared with the air supply loop adjusting strategy with only two states of switching, the control method provided by the application is more targeted, and the efficiency of the air supply loop can be effectively improved. When the working mode of the compressor is a heating mode, adjusting the opening of the main-path electronic expansion valve based on the current environment temperature and the historical data of the opening of the main-path electronic expansion valve; and adjusting the opening degree of the auxiliary electronic expansion valve based on the ambient temperature and the exhaust superheat degree. Similarly, the ambient temperature and the exhaust superheat degree are used as feedback of the air supplementing and enthalpy increasing effect of the air supplementing loop, so that the opening degree of a valve of the next adjusting air supplementing loop is corrected based on the result of adjusting the air supplementing loop, namely the current ambient temperature, and the air supplementing loop can better finish the air supplementing and enthalpy increasing effect. Compared with the air supply loop adjusting strategy with only two states of switching, the control method provided by the application is more targeted, and the efficiency of the air supply loop can be effectively improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method for controlling a charge-air circuit of a charge-air enthalpy-increasing compressor according to an embodiment of the present disclosure;
FIG. 2 is a partial flow diagram of a method for controlling a charge-air circuit of a charge-air enthalpy-increasing compressor according to an embodiment of the present disclosure;
FIG. 3 is a partial flow diagram of a method for controlling a charge-air circuit of a charge-air enthalpy-increasing compressor according to an embodiment of the present disclosure;
FIG. 4 is a partial flow diagram of a method for controlling a charge-air circuit of a charge-air enthalpy-increasing compressor according to an embodiment of the present disclosure;
FIG. 5 is a partial flow diagram of a method for controlling a charge-air circuit of a charge-air enthalpy-increasing compressor according to an embodiment of the present application;
FIG. 6 is a flow chart of a method for controlling a charge-air circuit of a charge-air enthalpy-increasing compressor according to an embodiment of the present application;
FIG. 7 is a flow chart of a method for controlling a charge-air circuit of a charge-air enthalpy-increasing compressor according to an embodiment of the present application;
FIG. 8 is a schematic diagram of a control device of a vapor-filling circuit of a vapor-filling enthalpy-increasing compressor according to the present application;
FIG. 9 is a view of an vapor-filling loop of a vapor-filling enthalpy-increasing compressor according to the present applicationStructure of control deviceSchematic representation.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail below. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without making any creative effort, shall fall within the protection scope of the present application.
In the use process of a common household air source heat pump air conditioner, the heat supply amount of the air conditioner is obviously reduced along with the reduction of the outdoor environment temperature during heating in winter, the compression ratio of an air conditioner compressor is increased under the ultralow temperature operation, the exhaust temperature is continuously increased, and the unit is potential safety hazard caused by long-term operation. The heat pump is fast in frosting in low-temperature and high-humidity environment operation, the normal working time is short, cold air can be blown to an indoor air-conditioning room during defrosting, and the comfort is poor. Therefore, a gas-supplementing enthalpy-increasing technology is proposed to improve the operation condition of the system at low temperature.
The vapor-supplementing enthalpy-increasing system is a novel system consisting of a vapor-supplementing enthalpy-increasing compressor, a vapor-supplementing enthalpy-increasing technology and an efficient subcooler, and the combination of the three technologies can provide efficient performance. The system is an organic whole, namely an economizer and a high-efficiency heat exchanger which are formed by a high-efficiency air-supply enthalpy-increasing compressor, a high-efficiency subcooler and an electronic expansion valve jointly form a high-efficiency energy-saving air-supply system.
In the structure of the steam-injection scroll compressor: the fixed scroll is provided with a second air suction port connected with a steam injection pipe. Thus, the scroll compressor has 2 suction ports and 1 discharge port. The scroll compressor is provided with 2 air supply loops, the loop corresponding to the original air suction port is a main air supply loop, and the auxiliary air supply loop corresponding to the second air suction port; a main electronic expansion valve is arranged in the main gas supplementing loop; an auxiliary electronic expansion valve is arranged in the auxiliary air supply loop.
The second suction port of the injection enthalpy-increasing scroll compressor will help to increase the flow rate of the main cycle. With the aid of the flash tank, the high-pressure/high-temperature liquid is expanded by the auxiliary electronic expansion valve and then changed into medium-pressure gas to be sprayed into the second suction port, which is similar to the concept of two-step compression of low-temperature gas. At the same time, the enthalpy of the liquid in the flash tank will drop to the value of the next cycle. The technology of the steam injection enthalpy-increasing vortex heat pump solves two key problems of operation at low ambient temperature in the traditional heat pump technology: the refrigerant amount at the suction port is much smaller than the capacity of the compressor, so that the capacity of the compressor is not fully utilized; the enthalpy of the liquid refrigerant before the electronic expansion valve of the outdoor unit is very high, which affects the efficiency of the heat exchanger.
The air-supplying enthalpy-increasing technology can effectively improve the heating capacity of the system under the low-temperature working condition, prevent the exhaust temperature of the compressor from being too high, and ensure the operation stability of the unit under the low-temperature working condition.
However, the existing air supply loop of the air supply enthalpy-increasing compressor is only controlled more coarsely, namely, the air supply loop is only simply divided into an open state and a closed state. In this control mode, the efficiency of the vapor-filling enthalpy-increasing compressor is very low.
Example one
Fig. 1 is a flowchart of a method for controlling an vapor-filling circuit of an vapor-filling enthalpy-increasing compressor according to the present application. Referring to fig. 1, the control method of the vapor-supplying loop of the vapor-supplying enthalpy-increasing compressor provided by the application is applied to the vapor-supplying enthalpy-increasing compressor; the control method of the air supply loop of the air supply enthalpy-increasing compressor comprises the following steps:
s101, determining that the working mode of a compressor is a heating mode, and the control mode is an automatic mode;
s102, adjusting the opening of the main-path electronic expansion valve based on the current environment temperature and historical data of the opening of the main-path electronic expansion valve; specifically, referring to fig. 2, the method for adjusting the opening of the main electronic expansion valve in the heating mode includes:
s201, calculating an EXV target opening constant plus a first preset multiple of the environment temperature plus a first preset value to obtain a first opening numerical value;
s202, judging whether the difference value between the first opening degree value and the opening degree value of the main circuit electronic expansion valve in the previous period is within a first preset range;
s203, if the judgment result is yes, the opening of the main-path electronic expansion valve is not changed;
and S204, if the judgment result is negative, adjusting the opening numerical value of the main-path electronic expansion valve to be the first opening numerical value.
In order to express the above steps more intuitively, the following describes the above process again by means of a formula:
first, to assist the reader in better understanding the meaning of each symbol, the present application provides the following table illustrating each symbol:
description of the nouns:
EVI 0: an EVI initial opening degree;
EVIn: opening of the EVI present cycle;
EVIn-1: opening of the period on the EVI;
t0: initial ambient temperature, in units;
tn: the ambient temperature of the cycle, in units;
n4: EVI manually sets the opening;
n6: target EVI exhaust superheat (hands);
n7: EVI target exhaust superheat constant (self);
n11: EVI non-regulated temperature difference in units;
n15: an initial opening degree base number;
t, exhausting gas: actual exhaust temperature, in units;
setting T backwater: when heating, setting the heating backwater temperature in unit;
t lower limit of water tank temperature setting: setting a lower limit value of the temperature of the hot water making water tank;
DTCn: the actual exhaust superheat degree in unit ℃ in the period;
DTS: target exhaust superheat degree, unit ℃;
kp: n1/10, superheat scaling factor.
k is F4/100, and 2-bit decimal (the specific value needs to be obtained through experiments);
DTCn-1 is the actual superheat degree of the last cycle of refrigeration;
in operation, the manual mode and the automatic mode can be switched at any time.
Parameter setting table
The above-mentioned method can refer to the following formula in the concrete implementation process:
first in step S201, by the formula: [ F2+ k Tn +0.5] to obtain a third cado value; wherein: f4/100, leaving 2 decimal places, where k is the first preset multiple. The first preset value is set to 0.5 in the above formula. It should be noted that, in the solution corresponding to the present application, the first preset value may be, but is not limited to, 0.5.
Immediately thereafter in step S202, assuming that the first preset range is (-2, 2), the following formula may be based:
-2≤[F2+k*Tn+0.5]-EXVn-1≤2；
judging whether the difference value between the first opening degree value and the opening degree value of the main circuit electronic expansion valve in the previous period is within a first preset range or not; if the formula: if the difference value is within a first preset range, executing step S403, and if the judgment result is yes, not changing the opening of the main-circuit electronic expansion valve; if the formula: if the difference value is not within the first preset range if the value-2 is not more than or equal to [ F2+ k Tn +0.5] -EXVn-1 is not more than or equal to 2, executing the step S204, and if the judgment result is no, adjusting the opening value of the main electronic expansion valve to the first opening value. Namely, in addition: EXVn ═ F2+ k Tn +0.5 ].
And S103, adjusting the opening degree of the auxiliary electronic expansion valve based on the ambient temperature and the exhaust superheat degree.
Specifically, referring to fig. 3, the method for adjusting the opening of the auxiliary electronic expansion valve in the heating mode includes:
s301, acquiring an actual exhaust superheat value;
the heating mode includes two modes, one mode is a mode containing heating and heating water, and the other mode is a mode of heating water only.
The unit is electrified, and the opening degree of the electronic expansion valve returns to zero when the compressor does not operate;
the compressor is powered on, the EVI is opened to an initial opening EXI0 (initial ambient temperature) N15-10 × T0, and then the initial opening EVI is maintained for 60 seconds.
And then enters an automatic operation mode.
Under the mode of heating and hot water making, setting the actual exhaust superheat value as T exhaust-T backwater; in the single hot water mode, the actual exhaust superheat value is T exhaust-T tank temperature, and a lower limit is set.
Through the two modes, the actual exhaust superheat values can be determined respectively.
Adjusting the electronic expansion valve, and gradually making the actual superheat degree DTCn consistent with the target superheat degree trend DTS:
s302, judging whether the difference value of the actual exhaust superheat degree value and the preset exhaust superheat degree value is within a second preset range;
it should be noted that the purpose of the next adjustment is to adjust the electronic expansion valve so as to gradually bring the actual superheat DTCn into agreement with the target superheat DTS:
s303, if the judgment result is yes, the opening degree of the auxiliary electronic expansion valve is not changed;
step S303 and step S303 are combined and expressed by the formula: if-N11 ≦ DTCn-DTS ≦ N11, then EVIn ═ EVIn-1;
wherein (-N11, N11) is the second predetermined range.
And S304, if the judgment result is negative, adjusting the opening degree of the auxiliary electronic expansion valve based on the difference value of the actual exhaust superheat degree value and the preset exhaust superheat degree value.
Specifically, step S304 includes: judging whether the actual exhaust superheat value is larger than a preset exhaust superheat value or not;
if the judgment result is yes, calculating the opening value of the auxiliary electronic expansion valve in the last period, adding the actual exhaust superheat value of the first preset value and the second preset multiple, and subtracting the preset exhaust superheat value of the second preset multiple to obtain a second opening value; adjusting the opening numerical value of the auxiliary electronic expansion valve to a second opening numerical value: the steps are expressed by a formula as follows: when DTCn > DTS + N11, then EVIn ═ EVIn-1) + [ KP (DTCn-DTS) +0.5 ].
If the judgment result is negative, subtracting the actual exhaust superheat value of the second preset multiple from the actual exhaust superheat value of the first preset multiple and the actual exhaust superheat value of the second preset multiple in the last period to obtain a first opening value; and adjusting the opening numerical value of the auxiliary electronic expansion valve to be a first opening numerical value. The steps are expressed by a formula as follows: when DTCn < DTS-N11, EVIn ═ (EVIn-1) + [ KP (DTCn-DTS) -0.5.
It should be noted that, after the unit is just started to be opened, the state of the unit is acquired as needed;
when the unit is electrified and the compressor does not run, the opening of the main electronic expansion valve is adjusted to 0 by the heat, and the opening of the auxiliary electronic expansion valve is adjusted to 0.
When the unit starts to be electrified and started, the opening of the main electronic expansion valve needs to be adjusted to the initial opening: during refrigeration, the initial opening degree of the main electronic expansion valve is EXV0 ═ T0 × 8+ F9(F9, the initial opening degree base number, the default value and the adjustability); during heating, the initial opening of the main electronic expansion valve is EXVk [ F2+ kT0+0.5] (K ═ F4/100, with 2 decimal places reserved).
The initial opening degree of the auxiliary electronic expansion valve is EXI0 ═ N15-10 × T0 (initial ambient temperature), and then the EVI initial opening degree is maintained for 60 seconds.
So set up and to make each electron expansion valve keep a comparatively suitable aperture when just opening the unit to the regulation in later stage.
Further, referring to fig. 4, the solution provided by the present application further includes:
s401, determining the working mode of the compressor; wherein the working mode includes: a heating mode and a cooling mode;
it should be noted that the compressor is a part of the refrigeration and heating system, and when the refrigeration and heating system performs heating, the working mode of the compressor is a heating mode; when the refrigeration and heating system performs refrigeration, the working mode of the compressor is a refrigeration mode;
s402, when the working mode of the compressor is a refrigerating mode, adjusting the opening of the main-path electronic expansion valve based on the exhaust superheat degree;
in the structure of the vapor-injection scroll compressor: the fixed scroll is provided with a second air suction port connected with a steam injection pipe. Thus, the scroll compressor has 2 suction ports and 1 discharge port.
The second suction port of the injection enthalpy-increasing scroll compressor will help to increase the flow rate of the main cycle. With the aid of the flash tank, the high-pressure/high-temperature liquid is expanded by the auxiliary electronic expansion valve and then changed into medium-pressure gas to be sprayed into the second suction port, which is similar to the concept of two-step compression of low-temperature gas. At the same time, the enthalpy of the liquid in the flash tank will decrease to the opening of the electronic expansion valve.
Specifically, referring to fig. 5, in the cooling mode, the method for adjusting the opening degree of the main circuit electronic expansion valve includes:
s501, acquiring an actual exhaust superheat degree value;
in the cooling mode, the discharge superheat value is the value obtained by subtracting the fin temperature value from the discharge temperature value. The exhaust temperature value and the fin temperature value can be obtained according to sensors arranged on the exhaust port and the fin at the relevant positions. And then subtracting the temperature value of the fin from the exhaust temperature value to obtain a superheat value.
S502, judging whether the difference value of the actual exhaust superheat degree value and the preset exhaust superheat degree value is within a third preset range or not;
in practice, a predetermined discharge superheat value may be empirically determined, below which the compressor is most efficient. Thus, the discharge superheat value can be regarded as a reference for adjusting the efficiency of the compressor, so that the efficiency of the compressor can be kept as high as possible when the discharge superheat value is maintained in the interval.
This is so: in step S502: judging whether a formula-F11 is less than or equal to DTCn-DTS is less than or equal to F11(F11 is a refrigeration non-adjustment temperature difference, and 0-10 can be set), if yes, EXVn is EXVn-1;
s503, if the judgment result is yes, the opening of the main-path electronic expansion valve is not changed;
if the difference value between the actual exhaust superheat degree value and the preset exhaust superheat degree value is within a third preset range, the fact that the opening degree of the main-path electronic expansion valve just enables the efficiency of the compressor to be within an efficient range at the moment is shown, and therefore adjustment is not needed.
S504, if the judgment result is negative, the opening of the main-path electronic expansion valve is adjusted based on the difference value of the actual exhaust superheat value and the preset exhaust superheat value.
If the difference value between the actual exhaust superheat degree value and the preset exhaust superheat degree value is not within the first preset range, it is indicated that the difference between the actual exhaust superheat degree value and the preset exhaust superheat degree value is large, and at the moment, the compressor efficiency is lower than the condition that the difference value between the actual exhaust superheat degree value and the preset exhaust superheat degree value is within the first preset range, and the opening degree of the main-path electronic expansion valve needs to be adjusted, so that the difference value between the actual exhaust superheat degree value and the preset exhaust superheat degree value is determined to be within the first preset range. So that the compressor efficiency is always within an efficient range.
Specifically, referring to fig. 6, the manner of adjustment is as follows:
s601, judging whether the actual exhaust superheat value is larger than a preset exhaust superheat value or not;
s602, if the judgment result is yes, calculating the opening numerical value of the main-path electronic expansion valve in the upper cycle, adding the actual exhaust superheat numerical value of the first preset value and the second preset multiple, and subtracting the preset exhaust superheat numerical value of the second preset multiple to obtain a fourth numerical value; adjusting the opening numerical value of the main-path electronic expansion valve to a fourth opening numerical value;
expressed by the formula: when DTCn > DTS + F11, EXVn ═ (EXVn-1) + [ KP (DTCn-DTS) +0.5 ]. Namely: and adjusting the opening degree of the main electronic expansion valve to be (EXVn-1) + [ KP (DTCn-DTS) +0.5 ].
S603, if the judgment result is negative, subtracting the actual exhaust superheat value of the first preset multiple and the actual exhaust superheat value of the second preset multiple from the actual exhaust superheat value of the main-path electronic expansion valve of the last period to obtain a fifth opening value; and adjusting the opening numerical value of the main-path electronic expansion valve to a fifth opening numerical value.
Expressed by the formula: when DTCn < DTS-F11, EXVn ═ (EXVn-1) + [ KP (DTCn-DTS) -0.5 ]. Namely: and adjusting the opening degree of the main-path electronic expansion valve to be (EXVn-1) + [ KP (DTCn-DTS) -0.5 ].
When the operation mode of the compressor is the cooling mode, the opening degree of the main-path electronic expansion valve needs to be adjusted and controlled, and at this time, the opening degree of the auxiliary-path electronic expansion valve is 0.
S403, when the working mode of the compressor is the heating mode, determining a control mode; wherein the control mode includes: an automatic mode and a manual mode;
s404, if the control mode is the manual mode, acquiring the opening information of the main electronic expansion valve and the opening information of the auxiliary electronic expansion valve, and respectively adjusting the opening of the main electronic expansion valve and the opening of the auxiliary electronic expansion valve based on the opening information of the main electronic expansion valve and the opening information of the auxiliary electronic expansion valve;
in the manual mode, the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve only need to be adjusted according to information input by a user. Of course, the specific adjustment information may also be gear information. Each gear corresponds to the opening degree information of the main electronic expansion valve and the opening degree information of the auxiliary electronic expansion valve.
S405, if the control mode is the automatic mode, adjusting the opening of the main-road electronic expansion valve based on the current environment temperature and historical data of the opening of the main-road electronic expansion valve; and adjusting the opening degree of the auxiliary electronic expansion valve based on the ambient temperature and the exhaust superheat degree.
To sum up, the present application completes the control of the vapor-filling circuit of the vapor-filling enthalpy-increasing compressor, and in order to better explain the scheme provided by the present application, referring to fig. 7, fig. 7 is a flowchart of a control method of the vapor-filling circuit of the vapor-filling enthalpy-increasing compressor, provided by the present application:
s701, acquiring the state of the unit;
s702, when the unit is powered on and the compressor does not run, the opening of the main electronic expansion valve is adjusted to 0 by heat, and the opening of the auxiliary electronic expansion valve is adjusted to 0.
S703, determining the working mode of the compressor;
s704, when the working mode of the compressor is determined to be refrigeration, the opening of the main electronic expansion valve is adjusted to an initial opening, and the initial opening of the main electronic expansion valve is EXV0 which is T0 x 8+ F9(F9, an initial opening base number, a default value and adjustability);
s705, when the operation mode of the compressor is determined to be heating, the opening of the main electronic expansion valve is adjusted to the initial opening, and the initial opening of the main electronic expansion valve is EXVk [ F2+ kT0+0.5] (K F4/100, which holds 2-bit decimal).
S706, when the unit starts to be powered on and started and the unit heats, the initial opening degree of the auxiliary electronic expansion valve is EXI0 (N15-10 × T0 (initial ambient temperature), and then the initial opening degree of the EVI is maintained for 60 seconds.
When the operation mode of the compressor is confirmed to be cooling, steps S607 to S612 are executed.
S707, acquiring an actual exhaust superheat degree value;
s708, judging whether the difference value between the actual exhaust superheat degree value and the preset exhaust superheat degree value is within a third preset range;
s709, if the judgment result is yes, the opening of the main-path electronic expansion valve is not changed;
s710, if the judgment result is negative, judging whether the actual exhaust superheat degree value is larger than a preset exhaust superheat degree value;
s711, if the judgment result is yes, calculating the opening numerical value of the main-path electronic expansion valve in the upper cycle, adding the actual exhaust superheat numerical value of the first preset value and the second preset multiple, and subtracting the preset exhaust superheat numerical value of the second preset multiple to obtain a fourth numerical value; adjusting the opening numerical value of the main-path electronic expansion valve to a fourth opening numerical value;
s712, if the judgment result is negative, subtracting the actual exhaust superheat value of the first preset multiple and the actual exhaust superheat value of the second preset multiple from the actual exhaust superheat value of the main-path electronic expansion valve of the last period to obtain a preset exhaust superheat value of the second preset multiple, and obtaining a fifth opening value; and adjusting the opening numerical value of the main-path electronic expansion valve to a fifth opening numerical value.
S713, determining a control mode;
s714, if the control mode is the manual mode, acquiring the opening information of the main electronic expansion valve and the opening information of the auxiliary electronic expansion valve, and respectively adjusting the opening of the main electronic expansion valve and the opening of the auxiliary electronic expansion valve based on the opening information of the main electronic expansion valve and the opening information of the auxiliary electronic expansion valve;
s715, if the control mode is the automatic mode, calculating an EXV target opening constant, adding a first preset multiple of the environmental temperature and adding a first preset value to obtain a first opening numerical value;
s716, judging whether the difference value between the first opening degree value and the opening degree value of the main circuit electronic expansion valve in the previous period is within a first preset range;
s717, if the judgment result is yes, the opening of the main electronic expansion valve is not changed;
and S718, if the judgment result is negative, adjusting the opening numerical value of the main-path electronic expansion valve to be the first opening numerical value.
S719, acquiring an actual exhaust superheat degree value;
s720, judging whether the difference value of the actual exhaust superheat degree value and the preset exhaust superheat degree value is within a second preset range;
s721, if the judgment result is yes, the opening degree of the auxiliary electronic expansion valve is not changed;
s722, if the judgment result is negative, judging whether the actual exhaust superheat value is larger than a preset exhaust superheat value;
s723, if the determination result is yes, calculating an actual exhaust superheat value of the opening value of the auxiliary electronic expansion valve plus the first preset value plus the second preset multiple in the upper cycle minus a preset exhaust superheat value of the second preset multiple, to obtain a second opening value; adjusting the opening numerical value of the auxiliary electronic expansion valve to a second opening numerical value;
s724, if the judgment result is negative, subtracting the actual exhaust superheat value of the first preset multiple and the actual exhaust superheat value of the second preset multiple from the actual exhaust superheat value of the auxiliary electronic expansion valve of the last period to obtain a first opening value; and adjusting the opening numerical value of the auxiliary electronic expansion valve to be a first opening numerical value.
Example two;
fig. 8 is a schematic structural diagram of a control device of a vapor-filling circuit of a vapor-filling enthalpy-increasing compressor according to the present application, and referring to fig. 8, the control device of the vapor-filling circuit of the vapor-filling enthalpy-increasing compressor according to the present application,
a determining module 801, configured to determine that a working mode of the compressor is a heating mode, and a control mode is an automatic mode;
the adjusting module 802 is configured to adjust the opening of the main-road electronic expansion valve based on the current ambient temperature and historical data of the opening of the main-road electronic expansion valve;
the adjusting module 802 is further configured to adjust an opening degree of the auxiliary electronic expansion valve based on the ambient temperature and the exhaust superheat degree.
For specific implementation of the vehicle provided in the embodiment of the present application, reference may be made to implementation manners of the vehicle unmanned control method in any examples above, and details are not described here again.
EXAMPLE III
Fig. 9 is a schematic diagram of a control device of a vapor-filling circuit of a vapor-filling enthalpy-increasing compressor according to the present application, with reference to fig. 9: the control equipment of the air supply loop of the air supply enthalpy-increasing compressor is arranged in the air supply enthalpy-increasing compressor; control device of a vapor-filling circuit of a vapor-filling enthalpy-increasing compressor, comprising:
a processor, and a memory coupled to the processor;
the memory is used for storing a computer program;
the processor is used for calling and executing a computer program in the memory to execute the control method of the vapor-filling loop of the vapor-filling enthalpy-increasing compressor in any one of the embodiments.
The specific implementation of the control device for the vapor-supplying circuit of the vapor-supplying enthalpy-increasing compressor provided in the embodiment of the present application may refer to the implementation manners of any of the above embodiments, and details are not described here.
EXAMPLE five
The present application provides a storage medium, where a computer program is stored, and when the computer program is executed by a processor, the steps in the control method for an air-supply loop of an air-supply enthalpy-increasing compressor according to the first embodiment are implemented.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present application, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present application includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware that is related to instructions of a program, and the program may be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a separate product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (10)
1. A control method of a gas supplementing loop of a gas supplementing enthalpy increasing compressor is characterized by being applied to the gas supplementing enthalpy increasing compressor; the control method of the air supply loop of the air supply enthalpy-increasing compressor comprises the following steps:
determining that the working mode of the compressor is a heating mode, and the control mode is an automatic mode;
based on the current environment temperature and historical data of the opening of the electronic expansion valve of the main road, the opening of the electronic expansion valve of the main road is adjusted;
and adjusting the opening degree of the auxiliary electronic expansion valve based on the ambient temperature and the exhaust superheat degree.
2. The method for controlling the vapor-filling circuit of the vapor-filling enthalpy-increasing compressor according to claim 1, characterized in that it further comprises:
acquiring the state of the unit;
when the unit is electrified and the compressor does not run, the opening of the main electronic expansion valve is adjusted to 0 by heat, and the opening of the auxiliary electronic expansion valve is adjusted to 0;
when the unit is powered on and the compressor starts to operate, the opening degree of the main electronic expansion valve is adjusted to the initial opening degree of the main electronic expansion valve through heat, and the opening degree of the auxiliary electronic expansion valve is adjusted to the initial opening degree of the auxiliary electronic expansion valve.
3. The method for controlling the vapor-filling loop of the vapor-filling enthalpy-increasing compressor according to claim 1, wherein the adjusting the opening degree of the main-path electronic expansion valve based on the current temperature and the history data of the opening degree of the main-path electronic expansion valve comprises:
calculating the sum of the EXV target opening constant plus the first preset multiple of the environment temperature plus the first preset value to obtain a first opening numerical value;
judging whether the difference value between the first opening degree value and the opening degree value of the main circuit electronic expansion valve in the previous period is within a first preset range or not;
if the judgment result is yes, the opening of the main-path electronic expansion valve is not changed;
and if the judgment result is negative, adjusting the opening numerical value of the main-path electronic expansion valve to the first opening numerical value.
4. The method for controlling the vapor-filling circuit of the vapor-filling enthalpy-increasing compressor according to claim 1, wherein the adjusting the opening degree of the auxiliary electronic expansion valve based on the ambient temperature and the exhaust superheat degree comprises:
acquiring an actual exhaust superheat value;
judging whether the difference value of the actual exhaust superheat degree value and the preset exhaust superheat degree value is within a second preset range or not;
if the judgment result is yes, the opening degree of the auxiliary electronic expansion valve is not changed;
and if the judgment result is negative, adjusting the opening degree of the auxiliary electronic expansion valve based on the difference value of the actual exhaust superheat degree value and the preset exhaust superheat degree value.
5. The method for controlling the air-supplying loop of the air-supplying enthalpy-increasing compressor according to claim 4, wherein the adjusting the opening degree of the auxiliary electronic expansion valve based on the difference between the actual exhaust superheat value and the preset exhaust superheat value comprises:
judging whether the actual exhaust superheat value is larger than a preset exhaust superheat value or not;
if the judgment result is yes, calculating the opening value of the auxiliary electronic expansion valve in the last period, adding the actual exhaust superheat value of the first preset value and the second preset multiple, and subtracting the preset exhaust superheat value of the second preset multiple to obtain a second opening value; adjusting the opening numerical value of the auxiliary electronic expansion valve to the second opening numerical value;
if the judgment result is negative, subtracting the actual exhaust superheat value of the first preset multiple and the actual exhaust superheat value of the second preset multiple from the actual exhaust superheat value of the auxiliary electronic expansion valve of the last period to obtain a third opening value; and adjusting the opening numerical value of the auxiliary electronic expansion valve to the third opening numerical value.
6. The method for controlling the vapor-filling circuit of the vapor-filling enthalpy-increasing compressor according to claim 1, characterized in that it further comprises:
determining the working mode of the compressor as a refrigeration mode;
when the working mode of the compressor is a refrigeration mode, the opening of the main-path electronic expansion valve is adjusted based on the exhaust superheat degree;
determining that the working mode of the compressor is a heating mode, and the control mode is a manual mode;
the method comprises the steps of obtaining opening information of a main electronic expansion valve and opening information of an auxiliary electronic expansion valve, and respectively adjusting the opening of the main electronic expansion valve and the opening of the auxiliary electronic expansion valve based on the opening information of the main electronic expansion valve and the opening information of the auxiliary electronic expansion valve.
7. The method for controlling the vapor-filling loop of the vapor-filling enthalpy-increasing compressor according to claim 6, wherein the adjusting the opening of the main-path electronic expansion valve based on the exhaust superheat degree comprises:
acquiring an actual exhaust superheat value;
judging whether the difference value of the actual exhaust superheat degree value and the preset exhaust superheat degree value is within a third preset range or not;
if the judgment result is yes, the opening of the main-path electronic expansion valve is not changed;
if the judgment result is negative, the opening of the main-path electronic expansion valve is adjusted based on the difference value of the actual exhaust superheat value and the preset exhaust superheat value.
8. The method for controlling the vapor-filling loop of the vapor-filling enthalpy-increasing compressor according to claim 7, wherein the adjusting the opening degree of the main-path electronic expansion valve based on the difference between the actual exhaust superheat value and the preset exhaust superheat value comprises:
judging whether the actual exhaust superheat value is larger than a preset exhaust superheat value or not;
if the judgment result is yes, calculating the opening numerical value of the main-path electronic expansion valve in the last period, adding the actual exhaust superheat numerical value of the first preset value plus the second preset multiple, and subtracting the preset exhaust superheat numerical value of the second preset multiple to obtain a fourth numerical value; adjusting the opening value of the main-path electronic expansion valve to the fourth opening value;
if the judgment result is negative, subtracting the actual exhaust superheat value of the first preset multiple and the actual exhaust superheat value of the second preset multiple from the actual exhaust superheat value of the main-path electronic expansion valve of the last period to obtain a fifth opening value; and adjusting the opening numerical value of the main-path electronic expansion valve to the fifth opening numerical value.
9. A control device of a gas supplementing loop of a gas supplementing enthalpy increasing compressor is characterized by being arranged in the gas supplementing enthalpy increasing compressor; control device of tonifying qi return circuit of tonifying qi enthalpy-increasing compressor includes:
the determining module is used for determining that the working mode of the compressor is a heating mode and the control mode is an automatic mode;
the adjusting module is used for adjusting the opening of the main-path electronic expansion valve based on the current environment temperature and historical data of the opening of the main-path electronic expansion valve;
and the adjusting module is also used for adjusting the opening degree of the auxiliary electronic expansion valve based on the ambient temperature and the exhaust superheat degree.
10. A control device of a gas supplementing loop of a gas supplementing enthalpy increasing compressor is characterized by being arranged in the gas supplementing enthalpy increasing compressor; control device of a vapor-filling circuit of a vapor-filling enthalpy-increasing compressor, comprising:
a processor, and a memory coupled to the processor;
the memory is used for storing a computer program;
the processor is configured to call and execute the computer program in the memory to execute the method for controlling the vapor-filling circuit of the vapor-filling enthalpy-increasing compressor according to any one of claims 1 to 8.
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