CN109798626A - The control method and device of the electric expansion valve of outer machine heat exchanger - Google Patents
The control method and device of the electric expansion valve of outer machine heat exchanger Download PDFInfo
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- CN109798626A CN109798626A CN201910012678.4A CN201910012678A CN109798626A CN 109798626 A CN109798626 A CN 109798626A CN 201910012678 A CN201910012678 A CN 201910012678A CN 109798626 A CN109798626 A CN 109798626A
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Abstract
The present invention proposes the control method and device of a kind of electric expansion valve of outer machine heat exchanger, wherein method includes: to obtain compressor exhaust temperature, Compressor Discharge Pressure, compressor return air pressure and compressor pressure ratio；According to compressor exhaust temperature, Compressor Discharge Pressure, compressor return air pressure and compressor pressure ratio, the electronic expansion valve opening of outer machine heat exchanger is controlled.Thus, according to compressor exhaust temperature, Compressor Discharge Pressure, compressor return air pressure and compressor pressure ratio, control the electronic expansion valve opening of outer machine heat exchanger, to, in the defrost stage, the velocity of discharge for improving the refrigerant in low-pressure tank avoids compressor from returning liquid, improves the reliability of air-conditioning system.
Description
Technical field
The present invention relates to air-conditioning technical field more particularly to a kind of control method of the electric expansion valve of outer machine heat exchanger and
A kind of control device of the electric expansion valve of outer machine heat exchanger.
Background technique
After frost accumulation to a certain degree, multi-line system will enter defrost pattern, system four-way Vavle switching, operational mode
It is switched to refrigeration mode from heating mode, external heat exchanger becomes condenser, and refrigerant is high pressure conditions, will be on heat exchanger by heat dissipation
Frost turn to condensed water and drain.At this point, temperature outside is low, the heat convection of refrigerant and environment is strong, and condensation number is big, and interior crosswind
Machine is out of service, and interior machine electronic expansion valve opening is big, and evaporability is insufficient, is easy to that low-pressure side is caused to return liquid, equally exists pressure
Contracting machine returns liquid risk.
Currently, the relevant technologies are by additional heat to gas-liquid separator or return line, so that return-air refrigerant absorbs heat
Evaporation increases the degree of superheat.
But the problem of the relevant technologies, is, on the one hand increasing additional heat will increase the operation power of system, is unfavorable for full
The energy-efficient demand of foot, on the other hand system flow path can be complicated, improve the cost of design and manufacture.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, of the invention
First purpose is to propose a kind of control method of the electric expansion valve of outer machine heat exchanger, can improve low in the defrost stage
The velocity of discharge for pressing the refrigerant in tank avoids compressor from returning liquid, improves the reliability of air-conditioning system.
Second object of the present invention is to propose a kind of control device of the electric expansion valve of outer machine heat exchanger.
In order to achieve the above objectives, a kind of electric expansion valve for outer machine heat exchanger that first aspect present invention embodiment proposes
Control method includes: to obtain compressor exhaust temperature, Compressor Discharge Pressure, compressor return air pressure and compressor pressure ratio；
According to the compressor exhaust temperature, the pressure at expulsion, the back pressure and compressor pressure ratio, controls outer machine and change
The electronic expansion valve opening of hot device.
The control method of the electric expansion valve of the outer machine heat exchanger proposed according to embodiments of the present invention obtains compressor air-discharging
Temperature, Compressor Discharge Pressure, compressor return air pressure and compressor pressure ratio, and according to compressor exhaust temperature, compressor
Pressure at expulsion, compressor return air pressure and compressor pressure ratio control the electronic expansion valve opening of outer machine heat exchanger.Root as a result,
According to compressor exhaust temperature, Compressor Discharge Pressure, compressor return air pressure and compressor pressure ratio, outer machine heat exchanger is controlled
Electronic expansion valve opening, thus, in the defrost stage, the velocity of discharge of the refrigerant in low-pressure tank is improved, avoids compressor from returning liquid, mentions
The reliability of high air-conditioning system.
In addition, the control method of the electric expansion valve of outer machine heat exchanger according to the above embodiment of the present invention can also have
Following additional technical characteristic:
According to one embodiment of present invention, if the compressor exhaust temperature is greater than the first preset compressor exhaust temperature
Threshold value is spent, then controls the electronic expansion valve opening and increases by the first default aperture；If the compressor exhaust temperature is less than
Two preset compressor delivery temperature threshold values then control the electronic expansion valve opening and reduce by the second default aperture；If the pressure
Contracting machine delivery temperature is more than or equal to the second preset compressor delivery temperature threshold value, and is less than or equal to the first preset compressor exhaust temperature
Threshold value is spent, then it is constant to control the electronic expansion valve opening.
According to one embodiment of present invention, if the Compressor Discharge Pressure is greater than the first preset compressor exhaust pressure
Force threshold then controls the electronic expansion valve opening and increases by the first default aperture；If the Compressor Discharge Pressure is less than
Two preset compressor pressure at expulsion threshold values then control the electronic expansion valve opening and reduce by the second default aperture；If the pressure
Contracting machine pressure at expulsion is more than or equal to the second preset compressor pressure at expulsion threshold value, and is less than or equal to the first preset compressor exhaust pressure
It is constant then to control the electronic expansion valve opening for force threshold.
According to one embodiment of present invention, if the compressor return air pressure is greater than the first preset compressor return-air pressure
Force threshold then controls the electronic expansion valve opening and reduces by the first default aperture；If the compressor return air pressure is less than
Two preset compressor back pressure threshold values then control the electronic expansion valve opening and increase by the second default aperture；If the pressure
Contracting machine back pressure is more than or equal to the second preset compressor back pressure threshold value, and is less than or equal to the first preset compressor return-air pressure
It is constant then to control the electronic expansion valve opening for force threshold.
According to one embodiment of present invention, if compressor pressure ratio is greater than the first preset compressor pressure ratio threshold
Value then controls the electronic expansion valve opening and increases by the first default aperture；If the compressor pressure ratio is default less than second
Compressor pressure then controls the electronic expansion valve opening and reduces by the second default aperture than threshold value；If the compressor pressure
Than being more than or equal to the second preset compressor pressure ratio threshold value, and it is less than or equal to the first preset compressor pressure ratio threshold value, then controls
The electronic expansion valve opening is constant.
In order to achieve the above objectives, a kind of electric expansion valve for outer machine heat exchanger that second aspect of the present invention embodiment proposes
Control device includes: acquisition module, for obtain compressor exhaust temperature, Compressor Discharge Pressure, compressor return air pressure and
Compressor pressure ratio；Control module, for according to the compressor exhaust temperature, the pressure at expulsion, the back pressure and
The compressor pressure ratio controls the electronic expansion valve opening of outer machine heat exchanger.
The control device of the electric expansion valve of the outer machine heat exchanger proposed according to embodiments of the present invention is obtained by obtaining module
Compressor exhaust temperature, Compressor Discharge Pressure, compressor return air pressure and compressor pressure ratio are taken, and passes through control module root
According to compressor exhaust temperature, Compressor Discharge Pressure, compressor return air pressure and compressor pressure ratio, outer machine heat exchanger is controlled
Electronic expansion valve opening.As a result, according to compressor exhaust temperature, Compressor Discharge Pressure, compressor return air pressure and compressor
Pressure ratio controls the electronic expansion valve opening of outer machine heat exchanger, thus, in the defrost stage, improve the row of the refrigerant in low-pressure tank
Speed out avoids compressor from returning liquid, improves the reliability of air-conditioning system.
According to one embodiment of present invention, the control module is also used to: if the compressor exhaust temperature is greater than
First preset compressor delivery temperature threshold value then controls the electronic expansion valve opening and increases by the first default aperture；If described
Compressor exhaust temperature then controls the electronic expansion valve opening and reduces second less than the second preset compressor delivery temperature threshold value
Default aperture；If the compressor exhaust temperature is more than or equal to the second preset compressor delivery temperature threshold value, and is less than or equal to
First preset compressor delivery temperature threshold value, then it is constant to control the electronic expansion valve opening.
According to one embodiment of present invention, the control module is also used to: if the Compressor Discharge Pressure is greater than
First preset compressor pressure at expulsion threshold value then controls the electronic expansion valve opening and increases by the first default aperture；If described
Compressor Discharge Pressure then controls the electronic expansion valve opening and reduces second less than the second preset compressor pressure at expulsion threshold value
Default aperture；If the Compressor Discharge Pressure is more than or equal to the second preset compressor pressure at expulsion threshold value, and is less than or equal to
First preset compressor pressure at expulsion threshold value, then it is constant to control the electronic expansion valve opening.
According to one embodiment of present invention, the control module is also used to: if the compressor return air pressure is greater than
First preset compressor back pressure threshold value then controls the electronic expansion valve opening and reduces by the first default aperture；If described
Compressor return air pressure then controls the electronic expansion valve opening and increases by second less than the second preset compressor back pressure threshold value
Default aperture；If the compressor return air pressure is more than or equal to the second preset compressor back pressure threshold value, and is less than or equal to
First preset compressor back pressure threshold value, then it is constant to control the electronic expansion valve opening.
According to one embodiment of present invention, the control module is also used to: if compressor pressure ratio is greater than the
One preset compressor pressure ratio threshold value then controls the electronic expansion valve opening and increases by the first default aperture；If the compression
Machine pressure ratio then controls the electronic expansion valve opening and reduces second and default open less than the second preset compressor pressure ratio threshold value
Degree；If the compressor pressure ratio is more than or equal to the second preset compressor pressure ratio threshold value, and is less than or equal to the first default pressure
Contracting machine pressure ratio threshold value, then it is constant to control the electronic expansion valve opening.
Additional aspect and advantage of the invention will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Fig. 1 is the flow diagram according to the control method of the electric expansion valve of the outer machine heat exchanger of the embodiment of the present invention；
Fig. 2 is to be shown according to the process of the control method of the electric expansion valve of the outer machine heat exchanger of first embodiment of the invention
It is intended to；
Fig. 3 is the stream according to the control method of the electric expansion valve of the outer machine heat exchanger of first specific embodiment of the invention
Journey schematic diagram；
Fig. 4 is to be shown according to the process of the control method of the electric expansion valve of the outer machine heat exchanger of second embodiment of the invention
It is intended to；
Fig. 5 is the stream according to the control method of the electric expansion valve of the outer machine heat exchanger of second specific embodiment of the invention
Journey schematic diagram；
Fig. 6 is to be shown according to the process of the control method of the electric expansion valve of the outer machine heat exchanger of third embodiment of the invention
It is intended to；
Fig. 7 is the stream according to the control method of the electric expansion valve of the outer machine heat exchanger of third specific embodiment of the present invention
Journey schematic diagram；
Fig. 8 is to be shown according to the process of the control method of the electric expansion valve of the outer machine heat exchanger of four embodiment of the invention
It is intended to；
Fig. 9 is the stream according to the control method of the electric expansion valve of the outer machine heat exchanger of the 4th specific embodiment of the invention
Journey schematic diagram；
Figure 10 is the block diagram according to the control device of the electric expansion valve of the machine heat exchanger of the embodiment of the present invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
Below with reference to the accompanying drawings the control method and device of the electric expansion valve of the outer machine heat exchanger of the embodiment of the present invention are described.
Fig. 1 is the flow diagram according to the control method of the electric expansion valve of the outer machine heat exchanger of the embodiment of the present invention.
As shown in Figure 1, the control method of the electric expansion valve of outer machine heat exchanger includes:
S101 obtains compressor exhaust temperature, Compressor Discharge Pressure, compressor return air pressure and compressor pressure ratio.
It optionally, can be by the way that temperature sensor be arranged in compressor outlet, to obtain compressor exhaust temperature Tp.
Further, Compressor Discharge Pressure Pp is compressor outlet to point pressure any between indoor set heat exchanger, is pressed
Contracting machine back pressure Ph is that any point pressure of outdoor unit heat exchanger to suction port of compressor in other words can be by going out in compressor
Pressure sensor is arranged in mouth to any point between indoor set heat exchanger, to obtain Compressor Discharge Pressure Pp, by outdoor unit
Pressure sensor is arranged in any point of heat exchanger to suction port of compressor, to obtain compressor return air pressure Ph.
It should be noted that compressor pressure ratio Q is aforementioned compressor pressure at expulsion Pp's and compressor return air pressure Ph
Ratio, i.e. Q=Pp/Ph.
S102, according to compressor exhaust temperature, Compressor Discharge Pressure, compressor return air pressure and compressor pressure ratio,
Control the electronic expansion valve opening of outer machine heat exchanger.
Specifically, before air-conditioning system enters defrost pattern and four-way Vavle switching, i.e. defrost preparation stage, refrigerant is from compression
Machine discharge, and indoor set heat exchanger, electronic expansion valve of indoor unit, outdoor unit electric expansion valve, outdoor unit heat exchanger are flowed successively through,
Low-pressure tank, and compressor is eventually passed back to, at this point, can be according to compressor exhaust temperature Tp, pressure at expulsion Pp, back pressure Ph and pressure
Contracting machine pressure ratio Q controls the electronic expansion valve opening K of outer machine heat exchanger, to improve the refrigerant in low-pressure tank in the defrost stage
The velocity of discharge avoids compressor from returning liquid, improves the reliability of air-conditioning system.
Further, according to first embodiment of the invention, as shown in Fig. 2, according to compressor exhaust temperature Tp, compression
Machine pressure at expulsion Pp, compressor return air pressure Ph and compressor pressure ratio Q control the electronic expansion valve opening K of outer machine heat exchanger
It specifically includes:
S201 controls electronic expansion if compressor exhaust temperature is greater than the first preset compressor delivery temperature threshold value
Valve opening increases by the first default aperture.
That is, being greater than the first preset compressor delivery temperature threshold value Tp1, i.e. Tp > in compressor exhaust temperature Tp
When Tp1, control electronic expansion valve opening K increases by the first default aperture K1, improves the refrigerant velocity of discharge in low-pressure tank, avoids pressing
Contracting machine returns liquid, wherein the first preset compressor delivery temperature threshold value Tp1 is the maximum pressure normally to be defrosted according to air-conditioning system
Contracting machine outlet air temperature.
S202, if compressor exhaust temperature controls electronic expansion less than the second preset compressor delivery temperature threshold value
Valve opening reduces by the second default aperture.
That is, in compressor exhaust temperature Tp less than the second preset compressor delivery temperature threshold value Tp2, i.e. Tp <
When Tp2, control electronic expansion valve opening K reduces by the second default aperture K2, reduces the refrigerant velocity of discharge in low-pressure tank, it is ensured that empty
The defrost ability of adjusting system, wherein the second preset compressor delivery temperature threshold value Tp2 is normally to be defrosted according to air-conditioning system
Smallest compressor outlet air temperature.
S203 if compressor exhaust temperature is more than or equal to the second preset compressor delivery temperature threshold value, and is less than or equal to
First preset compressor delivery temperature threshold value, then it is constant to control electronic expansion valve opening.
That is, being more than or equal to the second preset compressor delivery temperature threshold value Tp2 in compressor exhaust temperature Tp, and small
When being equal to the first preset compressor delivery temperature threshold value Tp1, i.e. Tp2 < Tp≤Tp1, control electronic expansion valve opening K is constant.
Specifically, as shown in figure 3, executing step S10 after air-conditioning system enters the defrost preparation stage.
S10 initializes electronic expansion valve opening.
S11, control air-conditioning system carries out defrost, and stops preset time.
S12, judges whether compressor exhaust temperature Tp is greater than the first preset compressor delivery temperature threshold value Tp1.If so,
Then follow the steps S13；If not, thening follow the steps S14.
S13, control electric expansion valve increases by the first default aperture K1, and executes step S11.
Whether S14 judges compressor exhaust temperature Tp less than the second preset compressor delivery temperature threshold value Tp2.If so,
Then follow the steps S15；If not, thening follow the steps S16.
S15, control electric expansion valve reduces by the second default aperture K2, and executes step S11.
S16, control electronic expansion valve opening are constant.
Further, second embodiment according to the present invention, as shown in figure 4, according to compressor exhaust temperature Tp, compressor
Pressure at expulsion Pp, compressor return air pressure Ph and compressor pressure ratio Q control the electronic expansion valve opening K of outer machine heat exchanger also
Include:
S301 controls electronic expansion if Compressor Discharge Pressure is greater than the first preset compressor pressure at expulsion threshold value
Valve opening increases by the first default aperture.
That is, being greater than the first preset compressor pressure at expulsion threshold value Pp1, i.e. Pp > in Compressor Discharge Pressure Pp
When Pp1, control electronic expansion valve opening K increases by the first default aperture K1, improves the refrigerant velocity of discharge in low-pressure tank, avoids pressing
Contracting machine returns liquid, wherein the first preset compressor pressure at expulsion threshold value Pp1 is the maximum pressure normally to be defrosted according to air-conditioning system
Contracting machine exhaust pressure value.
If S302 Compressor Discharge Pressure controls electric expansion valve less than the second preset compressor pressure at expulsion threshold value
Aperture reduces by the second default aperture.
That is, in Compressor Discharge Pressure Pp less than the second preset compressor pressure at expulsion threshold value Pp2, i.e. Pp <
When Pp2, control electronic expansion valve opening K reduces by the second default aperture K2, reduces the refrigerant velocity of discharge in low-pressure tank, it is ensured that empty
The defrost ability of adjusting system, wherein the second preset compressor pressure at expulsion threshold value Pp2 is normally to be defrosted according to air-conditioning system
Smallest compressor exhaust pressure value.
If S303 Compressor Discharge Pressure is more than or equal to the second preset compressor pressure at expulsion threshold value, and is less than or equal to the
One preset compressor pressure at expulsion threshold value, then it is constant to control electronic expansion valve opening.
That is, being more than or equal to the second preset compressor pressure at expulsion threshold value Pp2 in Compressor Discharge Pressure Pp, and small
In being equal to the first preset compressor pressure threshold Pp1, i.e. when Pp2 < Pp≤Pp1, control electronic expansion valve opening K is constant.
Specifically, as shown in figure 5, executing step S20 after air-conditioning system enters the defrost preparation stage.
S20 initializes electronic expansion valve opening.
S21, control air-conditioning system carries out defrost, and stops preset time.
S22, judges whether Compressor Discharge Pressure Pp is greater than the first preset compressor pressure at expulsion threshold value Pp1.If so,
Then follow the steps S23；If not, thening follow the steps S24.
S23, control electric expansion valve increases by the first default aperture K1, and executes step S21.
Whether S24 judges Compressor Discharge Pressure Pp less than the second preset compressor pressure at expulsion threshold value Pp2.If so,
Then follow the steps S25；If not, thening follow the steps S26.
S25, control electric expansion valve reduces by the second default aperture K2, and executes step S21.
S26, control electronic expansion valve opening are constant.
Further, third embodiment according to the present invention, as shown in fig. 6, according to compressor exhaust temperature Tp, compression
Machine pressure at expulsion Pp, compressor return air pressure Ph and compressor pressure ratio Q control the electronic expansion valve opening K of outer machine heat exchanger
Further include:
S401 controls electronic expansion if compressor return air pressure is greater than the first preset compressor back pressure threshold value
Valve opening reduces by the first default aperture.
That is, being greater than the first preset compressor back pressure threshold value Ph1, i.e. Ph > in compressor return air pressure Ph
When Ph1, control electronic expansion valve opening K reduces by the first default aperture K1, reduces the refrigerant velocity of discharge in low-pressure tank, it is ensured that empty
The defrost ability of adjusting system, wherein the first preset compressor back pressure threshold value Ph1 is normally to be defrosted according to air-conditioning system
Maximum compression machine back pressure value.
S402, if compressor return air pressure controls electronic expansion less than the second preset compressor back pressure threshold value
Valve opening increases by the second default aperture.
That is, in compressor return air pressure Ph less than the second preset compressor back pressure threshold value Ph2, i.e. Ph <
When Ph2, control electronic expansion valve opening K increases by the second default aperture K2, improves the refrigerant velocity of discharge in low-pressure tank, avoids pressing
Contracting machine returns liquid, wherein the second preset compressor back pressure threshold value Ph2 is the minimum pressure normally to be defrosted according to air-conditioning system
Contracting machine back pressure value.
S403 if compressor return air pressure is more than or equal to the second preset compressor back pressure threshold value, and is less than or equal to
First preset compressor back pressure threshold value, then it is constant to control electronic expansion valve opening.
That is, being more than or equal to the second preset compressor back pressure threshold value Ph2 in compressor return air pressure Ph, and small
When being equal to the first preset compressor back pressure threshold value Ph1, i.e. Ph2 < Ph≤Ph1, control electronic expansion valve opening K is constant.
Specifically, as shown in fig. 7, executing step S30 after air-conditioning system enters the defrost preparation stage.
S30 initializes electronic expansion valve opening.
S31, control air-conditioning system carries out defrost, and stops preset time.
S32, judges whether compressor return air pressure Ph is greater than the first preset compressor back pressure threshold value Ph1.If so,
Then follow the steps S33；If not, thening follow the steps S34.
S33, control electric expansion valve reduces by the first default aperture K1, and executes step S31.
Whether S34 judges compressor return air pressure Ph less than the second preset compressor back pressure threshold value Ph2.If so,
Then follow the steps S35；If not, thening follow the steps S36.
S35, control electric expansion valve increases by the second default aperture K2, and executes step S31.
S36, control electronic expansion valve opening are constant.
Further, the 4th embodiment according to the present invention, as shown in figure 8, according to one embodiment of present invention, root
According to compressor exhaust temperature Tp, Compressor Discharge Pressure Pp, compressor return air pressure Ph and compressor pressure ratio Q, outer machine is controlled
The electronic expansion valve opening K of heat exchanger further include:
S501 controls electric expansion valve and opens if compressor pressure ratio is greater than the first preset compressor pressure ratio threshold value
Degree increases by the first default aperture.
That is, when compressor pressure ratio Q is greater than the first preset compressor pressure ratio threshold value Q1, i.e. Q > Q1, control
Electronic expansion valve opening K increases by the first default aperture K1, improves the refrigerant velocity of discharge in low-pressure tank, and compressor is avoided to return liquid,
Wherein, the first preset compressor pressure ratio threshold value Q1 is the maximum compression machine pressure ratio normally to be defrosted according to air-conditioning system
Value.
S502, if compressor pressure ratio controls electric expansion valve and open less than the second preset compressor pressure ratio threshold value
Degree reduces by the second default aperture.
That is, when compressor pressure ratio Q is less than the second preset compressor pressure ratio threshold value Q2, i.e. Q < Q2, control
Electronic expansion valve opening K increases by the second default aperture K2, reduces the refrigerant velocity of discharge in low-pressure tank, it is ensured that the change of air-conditioning system
White ability, wherein the second preset compressor pressure ratio threshold value Q2 is the smallest compressor normally to be defrosted according to air-conditioning system
Pressure ratio.
S503 if compressor pressure ratio is more than or equal to the second preset compressor pressure ratio threshold value, and is less than or equal to first
Preset compressor pressure ratio threshold value, then it is constant to control electronic expansion valve opening.
That is, being more than or equal to the second preset compressor pressure ratio threshold value Q2 in compressor pressure ratio Q, and it is less than or equal to
When the first preset compressor pressure ratio threshold value Q1, i.e. Q2 < Q≤Q1, control electronic expansion valve opening K is constant.
Specifically, as shown in figure 9, executing step S40 after air-conditioning system enters the defrost preparation stage.
S40 initializes electronic expansion valve opening.
S41, control air-conditioning system carries out defrost, and stops preset time.
S42, judges whether compressor pressure ratio Q is greater than the first preset compressor pressure ratio threshold value Q1.If it is, executing
Step S43；If not, thening follow the steps S44.
S43, control electric expansion valve increases by the first default aperture K1, and executes step S41.
Whether S44 judges compressor pressure ratio Q less than the second preset compressor pressure ratio threshold value Q2.If it is, executing
Step S45；If not, thening follow the steps S46.
S45, control electric expansion valve reduces by the second default aperture K2, and executes step S41.
S46, control electronic expansion valve opening are constant.
To sum up, the control method of the electric expansion valve of the outer machine heat exchanger proposed according to embodiments of the present invention obtains compression
Machine delivery temperature, Compressor Discharge Pressure, compressor return air pressure and compressor pressure ratio, and according to compressor exhaust temperature,
Compressor Discharge Pressure, compressor return air pressure and compressor pressure ratio control the electronic expansion valve opening of outer machine heat exchanger.By
This controls outer machine and changes according to compressor exhaust temperature, Compressor Discharge Pressure, compressor return air pressure and compressor pressure ratio
The electronic expansion valve opening of hot device, thus, in the defrost stage, the velocity of discharge of the refrigerant in low-pressure tank is improved, compressor is avoided
Liquid is returned, the reliability of air-conditioning system is improved.
Figure 10 is the block diagram according to the control device of the electric expansion valve of the outer machine heat exchanger of the embodiment of the present invention.
As shown in Figure 10, the control device 100 of the electric expansion valve of outer machine heat exchanger includes: to obtain module 1 and control mould
Block 2.
Wherein, obtain module 1 for obtain compressor exhaust temperature, Compressor Discharge Pressure, compressor return air pressure and
Compressor pressure ratio；Control module 2 be used for according to compressor exhaust temperature, Compressor Discharge Pressure, compressor return air pressure and
Compressor pressure ratio controls the electronic expansion valve opening of outer machine heat exchanger.
Further, according to one embodiment of present invention, control module 2 is also used to: if compressor exhaust temperature is big
In the first preset compressor delivery temperature threshold value, then controls electronic expansion valve opening and increase by the first default aperture；If compressor
Delivery temperature then controls electronic expansion valve opening and reduces by the second default aperture less than the second preset compressor delivery temperature threshold value；
If compressor exhaust temperature is more than or equal to the second preset compressor delivery temperature threshold value, and is less than or equal to the first preset compressor
It is constant then to control electronic expansion valve opening for delivery temperature threshold value.
Further, according to one embodiment of present invention, control module 2 is also used to: if Compressor Discharge Pressure is big
In the first preset compressor pressure at expulsion threshold value, then controls electronic expansion valve opening and increase by the first default aperture；If compressor
Pressure at expulsion then controls electronic expansion valve opening and reduces by the second default aperture less than the second preset compressor pressure at expulsion threshold value；
If Compressor Discharge Pressure is more than or equal to the second preset compressor pressure at expulsion threshold value, and is less than or equal to the first preset compressor
It is constant then to control electronic expansion valve opening for pressure at expulsion threshold value.
Further, according to one embodiment of present invention, control module 2 is also used to: if compressor return air pressure is big
In the first preset compressor back pressure threshold value, then controls electronic expansion valve opening and reduce by the first default aperture；If compressor
Back pressure then controls electronic expansion valve opening and increases by the second default aperture less than the second preset compressor back pressure threshold value；
If compressor return air pressure is more than or equal to the second preset compressor back pressure threshold value, and is less than or equal to the first preset compressor
It is constant then to control electronic expansion valve opening for back pressure threshold value.
Further, according to one embodiment of present invention, control module 2 is also used to: if compressor pressure ratio is greater than
First preset compressor pressure ratio threshold value then controls electronic expansion valve opening and increases by the first default aperture；If compressor pressure
Than less than the second preset compressor pressure ratio threshold value, then controlling electronic expansion valve opening and reducing by the second default aperture；If compression
Machine pressure ratio is more than or equal to the second preset compressor pressure ratio threshold value, and is less than or equal to the first preset compressor pressure ratio threshold value,
It is constant then to control electronic expansion valve opening.
The control device of the electric expansion valve for the outer machine heat exchanger that the embodiment of the present invention proposes and aforementioned outer machine heat exchanger
The control method of electric expansion valve corresponds, and details are not described herein.
To sum up, the control device of the electric expansion valve of the outer machine heat exchanger proposed according to embodiments of the present invention passes through acquisition
Module obtains compressor exhaust temperature, Compressor Discharge Pressure, compressor return air pressure and compressor pressure ratio, and passes through control
Module controls outer machine and changes according to compressor exhaust temperature, Compressor Discharge Pressure, compressor return air pressure and compressor pressure ratio
The electronic expansion valve opening of hot device.As a result, according to compressor exhaust temperature, Compressor Discharge Pressure, compressor return air pressure and
Compressor pressure ratio controls the electronic expansion valve opening of outer machine heat exchanger, thus, in the defrost stage, improve cold in low-pressure tank
The velocity of discharge of matchmaker avoids compressor from returning liquid, improves the reliability of air-conditioning system.
It should be noted that in flow charts indicate or logic and/or step described otherwise above herein, for example,
It is considered the order list of the executable instruction for realizing logic function, may be embodied in any computer can
Read in medium, for instruction execution system, device or equipment (such as computer based system, including the system of processor or its
He can be from instruction execution system, device or equipment instruction fetch and the system executed instruction) it uses, or combine these instruction executions
System, device or equipment and use.For the purpose of this specification, " computer-readable medium " can be it is any may include, store,
Communicate, propagate, or transport program is for instruction execution system, device or equipment or combines these instruction execution systems, device or sets
The standby and device that uses.The more specific example (non-exhaustive list) of computer-readable medium include the following: have one or
The electrical connection section (electronic device) of multiple wirings, portable computer diskette box (magnetic device), random access memory (RAM), only
It reads memory (ROM), erasable edit read-only storage (EPROM or flash memory), fiber device and portable light
Disk read-only memory (CDROM).In addition, computer-readable medium can even is that the paper that can print described program on it or its
His suitable medium, because can then be edited for example by carrying out optical scanner to paper or other media, be interpreted or must
It is handled when wanting with other suitable methods electronically to obtain described program, is then stored in computer storage
In.
It should be appreciated that each section of the invention can be realized with hardware, software, firmware or their combination.Above-mentioned
In embodiment, software that multiple steps or method can be executed in memory and by suitable instruction execution system with storage
Or firmware is realized.It, and in another embodiment, can be under well known in the art for example, if realized with hardware
Any one of column technology or their combination are realized: having a logic gates for realizing logic function to data-signal
Discrete logic, with suitable combinational logic gate circuit specific integrated circuit, programmable gate array (PGA), scene
Programmable gate array (FPGA) etc..
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
Centainly refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
One or more embodiment or examples in can be combined in any suitable manner.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on the figure or
Positional relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must
There must be specific orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (10)
1. a kind of control method of the electric expansion valve of outer machine heat exchanger characterized by comprising
Obtain compressor exhaust temperature, Compressor Discharge Pressure, compressor return air pressure and compressor pressure ratio；
According to the compressor exhaust temperature, the Compressor Discharge Pressure, the compressor return air pressure and the compressor
Pressure ratio controls the electronic expansion valve opening of outer machine heat exchanger.
2. the method as described in claim 1, which is characterized in that according to the compressor exhaust temperature, the compressor air-discharging
Pressure, the compressor return air pressure and compressor pressure ratio, the electronic expansion valve opening for controlling outer machine heat exchanger are specific
Include:
If the compressor exhaust temperature is greater than the first preset compressor delivery temperature threshold value, the electric expansion valve is controlled
Aperture increases by the first default aperture；
If the compressor exhaust temperature controls the electric expansion valve less than the second preset compressor delivery temperature threshold value
Aperture reduces by the second default aperture；
If the compressor exhaust temperature is more than or equal to the second preset compressor delivery temperature threshold value, and it is pre- to be less than or equal to first
If it is constant then to control the electronic expansion valve opening for compressor exhaust temperature threshold value.
3. the method as described in claim 1, which is characterized in that according to the compressor exhaust temperature, the compressor air-discharging
Pressure, the compressor return air pressure and compressor pressure ratio, the electronic expansion valve opening for controlling outer machine heat exchanger also wrap
It includes:
If the Compressor Discharge Pressure is greater than the first preset compressor pressure at expulsion threshold value, the electric expansion valve is controlled
Aperture increases by the first default aperture；
If the Compressor Discharge Pressure controls the electric expansion valve less than the second preset compressor pressure at expulsion threshold value
Aperture reduces by the second default aperture；
If the Compressor Discharge Pressure is more than or equal to the second preset compressor pressure at expulsion threshold value, and it is pre- to be less than or equal to first
If it is constant then to control the electronic expansion valve opening for Compressor Discharge Pressure threshold value.
4. the method as described in claim 1, which is characterized in that according to the compressor exhaust temperature, the compressor air-discharging
Pressure, the compressor return air pressure and compressor pressure ratio, the electronic expansion valve opening for controlling outer machine heat exchanger also wrap
It includes:
If the compressor return air pressure is greater than the first preset compressor back pressure threshold value, the electric expansion valve is controlled
Aperture reduces by the first default aperture；
If the compressor return air pressure controls the electric expansion valve less than the second preset compressor back pressure threshold value
Aperture increases by the second default aperture；
If the compressor return air pressure is more than or equal to the second preset compressor back pressure threshold value, and it is pre- to be less than or equal to first
If it is constant then to control the electronic expansion valve opening for compressor return air pressure threshold.
5. the method as described in claim 1, which is characterized in that according to the compressor exhaust temperature, the compressor air-discharging
Pressure, the compressor return air pressure and compressor pressure ratio, the electronic expansion valve opening for controlling outer machine heat exchanger also wrap
It includes:
If the compressor pressure ratio is greater than the first preset compressor pressure ratio threshold value, the electronic expansion valve opening is controlled
Increase by the first default aperture；
If the compressor pressure ratio controls the electronic expansion valve opening less than the second preset compressor pressure ratio threshold value
Reduce by the second default aperture；
If the compressor pressure ratio is more than or equal to the second preset compressor pressure ratio threshold value, and is less than or equal to the first default pressure
Contracting machine pressure ratio threshold value, then it is constant to control the electronic expansion valve opening.
6. a kind of control device of the electric expansion valve of outer machine heat exchanger characterized by comprising
Module is obtained, for obtaining compressor exhaust temperature, Compressor Discharge Pressure, compressor return air pressure and compressor pressure
Than；
Control module, for according to the compressor exhaust temperature, the pressure at expulsion, the back pressure and the compressor
Pressure ratio controls the electronic expansion valve opening of outer machine heat exchanger.
7. device as claimed in claim 6, which is characterized in that the control module is also used to:
If the compressor exhaust temperature is greater than the first preset compressor delivery temperature threshold value, the electric expansion valve is controlled
Aperture increases by the first default aperture；
If the compressor exhaust temperature controls the electric expansion valve less than the second preset compressor delivery temperature threshold value
Aperture reduces by the second default aperture；
If the compressor exhaust temperature is more than or equal to the second preset compressor delivery temperature threshold value, and it is pre- to be less than or equal to first
If it is constant then to control the electronic expansion valve opening for compressor exhaust temperature threshold value.
8. device as claimed in claim 6, which is characterized in that the control module is also used to:
If the Compressor Discharge Pressure is greater than the first preset compressor pressure at expulsion threshold value, the electric expansion valve is controlled
Aperture increases by the first default aperture；
If the Compressor Discharge Pressure controls the electric expansion valve less than the second preset compressor pressure at expulsion threshold value
Aperture reduces by the second default aperture；
If the Compressor Discharge Pressure is more than or equal to the second preset compressor pressure at expulsion threshold value, and it is pre- to be less than or equal to first
If it is constant then to control the electronic expansion valve opening for Compressor Discharge Pressure threshold value.
9. device as claimed in claim 6, which is characterized in that the control module is also used to:
If the compressor return air pressure is greater than the first preset compressor back pressure threshold value, the electric expansion valve is controlled
Aperture reduces by the first default aperture；
If the compressor return air pressure controls the electric expansion valve less than the second preset compressor back pressure threshold value
Aperture increases by the second default aperture；
If the compressor return air pressure is more than or equal to the second preset compressor back pressure threshold value, and it is pre- to be less than or equal to first
If it is constant then to control the electronic expansion valve opening for compressor return air pressure threshold.
10. device as claimed in claim 6, which is characterized in that the control module is also used to:
If the compressor pressure ratio is greater than the first preset compressor pressure ratio threshold value, the electronic expansion valve opening is controlled
Increase by the first default aperture；
If the compressor pressure ratio controls the electronic expansion valve opening less than the second preset compressor pressure ratio threshold value
Reduce by the second default aperture；
If the compressor pressure ratio is more than or equal to the second preset compressor pressure ratio threshold value, and is less than or equal to the first default pressure
Contracting machine pressure ratio threshold value, then it is constant to control the electronic expansion valve opening.
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| CN201910012678.4A CN109798626A (en) | 2019-01-07 | 2019-01-07 | The control method and device of the electric expansion valve of outer machine heat exchanger |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910012678.4A CN109798626A (en) | 2019-01-07 | 2019-01-07 | The control method and device of the electric expansion valve of outer machine heat exchanger |
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| CN201910012678.4A Pending CN109798626A (en) | 2019-01-07 | 2019-01-07 | The control method and device of the electric expansion valve of outer machine heat exchanger |
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| CN110925950A (en) * | 2019-11-20 | 2020-03-27 | 广东美的暖通设备有限公司 | Control method and device of air conditioning system, electronic equipment and storage medium |
| CN111023455A (en) * | 2019-12-26 | 2020-04-17 | Tcl空调器(中山)有限公司 | Defrosting control method, defrosting control device, air conditioner and readable storage medium |
| CN111442475A (en) * | 2020-04-10 | 2020-07-24 | 海信（山东）空调有限公司 | Defrosting control method and device of air conditioning system and air conditioner |
| CN112665119A (en) * | 2021-02-02 | 2021-04-16 | 南通华信中央空调有限公司 | Defrosting control method for direct expansion type air conditioner |
| CN113074452A (en) * | 2021-03-19 | 2021-07-06 | 海信（山东）空调有限公司 | Defrosting control method of air conditioner, air conditioner and storage medium |
| CN113108439A (en) * | 2021-05-20 | 2021-07-13 | 广东美的制冷设备有限公司 | Control method and device of air conditioner, air conditioner and storage medium |
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| CN113654223A (en) * | 2021-07-19 | 2021-11-16 | 青岛海尔空调器有限总公司 | Method for determining target exhaust gas temperature |
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| CN113108439A (en) * | 2021-05-20 | 2021-07-13 | 广东美的制冷设备有限公司 | Control method and device of air conditioner, air conditioner and storage medium |
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Application publication date: 20190524 |