CN107504729B - Method, device and storage medium for controlling expansion valve of enhanced vapor injection system - Google Patents
Method, device and storage medium for controlling expansion valve of enhanced vapor injection system Download PDFInfo
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- CN107504729B CN107504729B CN201710638960.4A CN201710638960A CN107504729B CN 107504729 B CN107504729 B CN 107504729B CN 201710638960 A CN201710638960 A CN 201710638960A CN 107504729 B CN107504729 B CN 107504729B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The embodiment of the invention provides a method, a device and a storage medium for controlling an expansion valve of an enhanced vapor injection system, belonging to the field of electric appliances. The method comprises the following steps: detecting a change in superheat of the compressor injection port; when the superheat degree is not in a preset range, opening or closing the auxiliary electronic expansion valve for a preset opening value; when the auxiliary electronic expansion valve is opened by a preset opening value, detecting the current of the air conditioner outdoor unit; when the current is smaller than a preset current value, opening the auxiliary electronic expansion valve again for a preset opening value; when the current is larger than a preset current value, reducing the frequency of the current until the current is lower than the preset current value, and opening the auxiliary electronic expansion valve again for a preset opening value; and repeatedly executing the operation until the superheat degree is in a preset range. Through the technical scheme, the superheat degree of the injection port of the compressor can be in a preset range, and overlarge current of the outdoor unit is avoided.
Description
Technical Field
The invention relates to the field of electric appliances, in particular to a method and a device for controlling an expansion valve of an air-conditioning enhanced vapor injection system and a storage medium.
Background
The enhanced vapor injection technology is often used for improving the low-temperature heating effect, and the principle is that the circulation volume of a system is improved by opening the air supply of the middle air supply port, so that the low-temperature heating effect is improved. At present, the air supplement is usually realized by using a combination of a plate heat exchanger and an auxiliary electronic expansion valve. However, when the opening of the auxiliary electronic expansion valve is increased, the suction volume of the compressor is increased, the current is also increased correspondingly, and a current protection shutdown or a current frequency limit may be caused, so that system fluctuation is caused, and the stability of the system is affected. In addition, in the existing enhanced vapor injection system, the superheat degree of the injection port of the compressor is difficult to control within a reasonable range.
Disclosure of Invention
To solve the above problems in the prior art, it is an object of the present invention to provide a method, an apparatus and a storage medium for controlling an expansion valve of an enhanced vapor injection system of an air conditioner.
In order to achieve the above object, an embodiment of the present invention provides a method for controlling an expansion valve of an air conditioning enhanced vapor injection system, where the enhanced vapor injection system includes a compressor, a first heat exchanger for enhanced vapor injection, and a bypass electronic expansion valve, and the method includes: detecting a change in superheat of the compressor injection port; when the superheat degree is not in a preset range, opening or closing the auxiliary electronic expansion valve for a preset opening value until the superheat degree is detected to be in the preset range; when the auxiliary electronic expansion valve is determined to be opened by a preset opening value, detecting the current of the air conditioner outdoor unit; when the current is smaller than a preset current value, continuously increasing the preset opening value of the auxiliary electronic expansion valve until the superheat degree is in the preset range; and when the current is larger than a preset current value, reducing the frequency of the current until the current is lower than the preset current value, and continuing to increase the preset opening value of the auxiliary electronic expansion valve until the superheat degree is in the preset range.
Optionally, when the degree of superheat is not within a preset range, opening or closing the auxiliary electronic expansion valve by a preset opening value comprises: when the superheat degree is larger than the upper boundary value of the preset range, opening the preset opening value of the auxiliary electronic expansion valve; and when the superheat degree is smaller than the lower boundary value of the preset range, closing the auxiliary electronic expansion valve for a preset opening value.
Optionally, the preset range comprises a first preset range and a second preset range, and the superheat degree is compared with the first preset range during the superheat degree increasing process; in the superheat degree reducing process, the superheat degree is compared with a second preset range.
Optionally, the preset opening values include a second plurality of preset opening values, and different preset opening values are adopted according to different ranges of the superheat degree in the process of rising and/or falling of the superheat degree.
Optionally, the preset current value includes a plurality of preset current values, and the plurality of preset current values respectively correspond to the plurality of preset opening values.
Optionally, the method further comprises: detecting an outdoor ambient temperature before detecting the change in the degree of superheat; if the outdoor environment temperature is higher than the preset temperature, closing the auxiliary electronic expansion valve; and if the outdoor environment temperature is less than or equal to a preset temperature, opening the auxiliary electronic expansion valve to an initial opening degree after the compressor runs for a preset time, and detecting the superheat degree.
On the other hand, an embodiment of the present invention further provides a device for controlling an expansion valve of an enhanced vapor injection system of an air conditioner, where the enhanced vapor injection system includes a compressor, a first heat exchanger for enhanced vapor injection, and an auxiliary electronic expansion valve, and the device includes: a superheat degree detection unit for detecting a change in a superheat degree of the compressor injection port; the current detection unit is used for detecting the current of the air conditioner outdoor unit; a control unit for performing the following control: detecting the change of the superheat degree through the superheat degree detection unit, and opening or closing the auxiliary electronic expansion valve to a preset opening value when the superheat degree is not in a preset range until the superheat degree is detected to be in the preset range; when the auxiliary electronic expansion valve is opened to a preset opening value, the current of the air conditioner outdoor unit is detected through the current detection unit; when the current is smaller than a preset current value, continuously increasing the preset opening value of the auxiliary electronic expansion valve until the superheat degree is in the preset range; and when the current is larger than a preset current value, reducing the frequency of the current until the current is lower than the preset current value, and continuing to increase the preset opening value of the auxiliary electronic expansion valve until the superheat degree is in the preset range.
Optionally, when the degree of superheat is not within a preset range, opening or closing the auxiliary electronic expansion valve by a preset opening value comprises: when the superheat degree is larger than the upper boundary value of the preset range, opening the preset opening value of the auxiliary electronic expansion valve; and when the superheat degree is smaller than the lower boundary value of the preset range, closing the auxiliary electronic expansion valve for a preset opening value.
Optionally, the preset range comprises a first preset range and a second preset range, and the superheat degree is compared with the first preset range during the superheat degree increasing process; in the superheat degree reducing process, the superheat degree is compared with a second preset range.
Optionally, the preset opening value comprises a plurality of preset opening values, and different preset opening values are adopted according to different ranges of the superheat degree in the process of rising and/or falling of the superheat degree.
Optionally, the preset current value includes a plurality of preset current values, and the plurality of preset current values respectively correspond to the plurality of preset opening values.
Optionally, the apparatus further comprises: an ambient temperature detection unit for detecting an outdoor ambient temperature; wherein, before detecting the change in the degree of superheat, the control unit is further configured to execute: if the outdoor environment temperature is higher than the preset temperature, closing the auxiliary electronic expansion valve; and if the outdoor environment temperature is less than or equal to the preset temperature, opening the auxiliary electronic expansion valve to an initial opening degree after the compressor runs for the preset time, and detecting the superheat degree through a superheat degree detection unit.
In addition, the embodiment of the present invention also provides a machine-readable storage medium, which stores instructions for causing a machine to execute the method described above in the present application.
Through the technical scheme, the low-temperature heating effect can be improved through an enhanced vapor injection technology, and meanwhile, the current of the outdoor unit and the auxiliary electronic expansion valve are controlled according to the superheat degree. The superheat degree of the injection port of the compressor is in a preset range through controlling the auxiliary electronic expansion valve. The current of the outdoor unit is controlled, so that the problem that the current of the outdoor unit is too large due to too much injected refrigerant can be avoided, the fluctuation of a system can be reduced, and the reliability of the system is ensured.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
FIG. 1 is a schematic view of an enhanced vapor injection system provided in accordance with one embodiment of the present invention;
FIG. 2 is a flow chart of a method for controlling an expansion valve of an air conditioning enhanced vapor injection system according to one embodiment of the present invention;
FIG. 3 is a schematic illustration of a preset range of superheat provided by one embodiment of the invention;
FIG. 4 is a flow chart of a method for controlling an expansion valve of an air conditioning enhanced vapor injection system according to another embodiment of the present invention;
FIG. 5 is a schematic view of a preset range of superheat provided by another embodiment of the invention;
FIG. 6 is a flow chart of a method for controlling an expansion valve of an air conditioning enhanced vapor injection system in accordance with a preferred embodiment of the present invention; and
fig. 7 is a block diagram of an apparatus for controlling an expansion valve of an air conditioning enhanced vapor injection system according to a preferred embodiment of the present invention.
Description of the reference numerals
101 gas-liquid separator 102 compressor
103 four-way valve 104 outdoor heat exchanger
105 low pressure stop valve 106 high pressure stop valve
107 first heat exchanger T6A, T6B temperature sensor
EXV1 main-circuit electronic expansion valve EXV2 auxiliary-circuit electronic expansion valve
701 superheat degree detection unit 702 current detection unit
703 control unit 704 ambient temperature detection unit
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
Before describing embodiments of the present invention, a brief description of an enhanced vapor injection system according to embodiments of the present invention will be provided. FIG. 1 is a schematic diagram of an enhanced vapor injection system according to one embodiment of the present invention. As shown in fig. 1, the enhanced vapor injection system includes a gas-liquid separator 101, a compressor 102, a four-way valve 103, an outdoor heat exchanger 104, a low-pressure cut-off valve 105, a high-pressure cut-off valve 106, a first heat exchanger 107, temperature sensors T6A and T6B, a main-path electronic expansion valve EXV1, and an auxiliary-path electronic expansion valve EXV 2. The auxiliary expansion valve EXV2 is used to control the flow rate of the refrigerant injected by the compressor of the bypass auxiliary, the first heat exchanger 107 may be a plate heat exchanger, for example, the compressor 102 has an exhaust port, a return port and an injection port, the exhaust port is connected to the four-way valve 103, the return port is connected to the gas-liquid separator 101, and the injection port is connected to the first heat exchanger 107. In the enhanced vapor injection system shown in fig. 1, the gas is supplied to the intermediate compression cavity during low-temperature heating by adopting a mode of 'plate heat exchanger 107+ auxiliary electronic expansion valve EXV 2', so that the purpose of improving the low-temperature heating effect is achieved.
The adjusting range of the main electronic expansion valve EXV1 and the auxiliary electronic expansion valve EXV2 may be, for example, 0-500 steps, and the aperture of the main electronic expansion valve EXV1 may be larger than that of the auxiliary electronic expansion valve EXV 2. When the opening degree of the auxiliary electronic expansion valve EXV2 is increased, the circulation amount of the compressor is increased and the current of the outdoor unit of the air conditioner is increased.
Example one
Fig. 2 is a flowchart of a method for controlling an expansion valve of an air conditioning enhanced vapor injection system according to an embodiment of the present invention. As shown in fig. 2, an embodiment of the present invention provides a method for controlling an expansion valve of an air conditioning enhanced vapor injection system, which may be used to regulate an electronic expansion valve of an enhanced vapor injection system such as that shown in fig. 1, the method comprising the steps of:
step S201 detects a change in superheat of the compressor injection port. In the present application, the degree of superheat is denoted by SH, which can be detected by the temperature sensors T6A and T6B shown in fig. 1, and the degree of superheat SH is the difference between the temperature sensor T6B and the temperature sensor T6A, that is, SH is T6B to T6A.
And step S202, opening or closing the auxiliary electronic expansion valve for a preset opening value when the superheat degree is not in a preset range. When the superheat degree is larger than the upper boundary of the preset range, the preset opening value of the auxiliary electronic expansion valve is opened, and when the superheat degree is smaller than the lower boundary of the preset range, the preset opening value of the auxiliary electronic expansion valve is closed. The preset opening value may be, for example, 8 steps.
Step S203, when the auxiliary electronic expansion valve is opened by a preset opening value, detecting the current of the air conditioner outdoor unit.
And step S204, when the current is smaller than the preset current value, opening the auxiliary electronic expansion valve again for a preset opening value, and executing step S206. The preset current value may be, for example, 90% of the maximum heating current of the outdoor unit.
Step S205, when the current is larger than a preset current value, reducing the frequency of the current until the current is lower than the preset current value, opening the auxiliary electronic expansion valve again for a preset opening value, and executing step S206. When the current is larger than a preset current value, the preset value of the current frequency can be reduced, whether the current is larger than the preset current value is detected again, and if the current is still larger than the preset current value, the preset value of the current frequency is continuously reduced until the current is lower than the preset current value. Wherein the preset value may be, for example, 1 Hz.
And step S206, repeatedly executing the operation until the superheat degree is in a preset range.
The method controls the opening degree of the auxiliary electronic expansion valve and the current of the outdoor unit according to the detected superheat degree of the injection port of the compressor and the detected current of the outdoor unit, and can enable the superheat degree of the injection port of the compressor to be in a reasonable range by continuously adjusting the auxiliary electronic expansion valve. In addition, in the process of adjusting the auxiliary electronic expansion valve, the current of the outdoor unit is not overhigh due to the fact that the auxiliary electronic expansion valve is opened, and the reliability of the system is guaranteed.
FIG. 3 is a schematic diagram of a preset range of superheat provided by an embodiment of the invention. As shown in FIG. 3, in a preferred embodiment of the present invention, the preset ranges include a first preset range (a1 ≧ SH ≧ b1) and a second preset range (a2 ≧ SH ≧ b2) with which the degree of superheat is compared during the degree of superheat increase; in the superheat degree reducing process, the superheat degree is compared with a second preset range. When the superheat degree is detected to be increased and is larger than the upper boundary value of the first preset range, opening the auxiliary electronic expansion valve by a preset opening value; and when the superheat degree is detected to be increased and is smaller than the lower boundary value of the first preset range, closing the auxiliary electronic expansion valve for a preset opening value. When the superheat degree is detected to be reduced and is larger than the upper boundary value of the second preset range, opening the auxiliary electronic expansion valve by a preset opening value; and when the superheat degree is detected to be reduced and is smaller than the lower boundary value of the second preset range, closing the preset opening value of the auxiliary electronic expansion valve. Wherein a1 may for example be 5 ℃, b1 may for example be 3 ℃, a2 may for example be 4 ℃ and b2 may for example be 2 ℃.
Through the technical scheme, the low-temperature heating effect can be improved through an enhanced vapor injection technology, and meanwhile, the current of the outdoor unit and the auxiliary electronic expansion valve are controlled according to the superheat degree. Through the control to auxiliary road electronic expansion valve for the superheat degree of compressor injection port is in predetermineeing the within range (for example between 2 ~ 5 ℃), can guarantee to get back to can not be liquid refrigerant in the middling pressure chamber, guarantees the reliability of compressor, can guarantee again that the superheat degree can not be too big, increases the circulation volume of compressor, guarantees the effect of heating. The current of the outdoor unit is controlled, so that the problem that the current of the outdoor unit is too large due to too much injected refrigerant can be avoided, the fluctuation of a system can be reduced, and the reliability of the system is ensured.
Example two
Fig. 4 is a flow chart of a method for controlling an expansion valve of an air conditioning enhanced vapor injection system according to another embodiment of the present invention. As shown in fig. 4, the preset opening value may include a plurality of preset opening values, and the preset current value may include a plurality of preset current values. In this embodiment, two preset opening values are taken as an example, and the method steps with a plurality of preset opening values are described. In this embodiment, the preset opening value includes a first preset opening value and a second preset opening value, and the preset current value includes a first preset current value and a second preset current value. The second preset opening value is larger than the first preset opening value, and the first preset current value and the second preset current value correspond to the first preset opening value and the second preset opening value respectively. The first preset opening value and the second preset opening value can be set differently according to actual conditions and can be selected according to the change condition and the difference of numerical values of the superheat degree.
In this embodiment, the method includes the steps of:
in step S401, a change in superheat of the compressor injection port is detected. The change in the degree of superheat may include a state of increase or decrease in the degree of superheat and a value of the degree of superheat. This degree of superheat can be detected by the temperature sensors T6A and T6B shown in fig. 1, and the degree of superheat SH is the difference between the temperature sensor T6B and the temperature sensor T6A, i.e., SH is T6B to T6A.
And step S402, when the superheat degree is not in a preset range, judging whether the superheat degree is in an ascending state or a descending state.
And step 403, judging the range of the superheat degree according to the change situation and the value of the superheat degree.
And 404, determining a first or second preset opening value for opening or closing the auxiliary electronic expansion valve according to the range of the superheat degree.
Step S405, when the auxiliary electronic expansion valve is opened by a preset opening value, detecting the current of the air conditioner outdoor unit, and comparing the current with a preset current value. When the preset opening value is a first preset opening value, the preset current value is a first preset current value; and when the preset opening value is a second preset opening value, the preset current value is a second preset current value.
Step S406, when the current is smaller than the first or second preset current value, the first or second preset opening value of the auxiliary electronic expansion valve is opened again, and step S408 is executed.
Step 407, when the current is greater than a preset current value, decreasing the frequency of the current until the current is lower than the first or second preset current value, opening the first or second preset opening value of the auxiliary electronic expansion valve again, and executing step 408.
And step S408, repeatedly executing the operation until the superheat degree is in a preset range.
FIG. 5 is a schematic view of a preset range of superheat provided by another embodiment of the invention. As shown in fig. 5, the preset range of the degree of superheat may include a first preset range to a tenth preset range. The step 404 may determine the opening value of the auxiliary electronic expansion valve to be opened or closed according to the following method:
in the process of the rise of the superheat degree, when the superheat degree is larger than a boundary value on the first preset range and the superheat degree is in a third preset range, the preset opening value is a first preset opening value; when the superheat degree is larger than a boundary value on the first preset range and the superheat degree is in a fifth preset range, the preset opening value is a second preset opening value; when the superheat degree is smaller than a lower boundary value of the first preset range and the superheat degree is within a seventh preset range, the preset opening value is a first preset opening value; and when the superheat degree is smaller than the lower boundary value of the first preset range and the superheat degree is within a ninth preset range, the preset opening value is a second preset opening value.
In the superheat degree reduction process, when the superheat degree is larger than a boundary value on the second preset range and the superheat degree is in a fourth preset range, the preset opening value is a first preset opening value; when the superheat degree is larger than a boundary value on the second preset range and the superheat degree is located in a sixth preset range, the preset opening value is a second preset opening value; when the superheat degree is smaller than a lower boundary value of the second preset range and the superheat degree is within an eighth preset range, the preset opening value is a first preset opening value; and when the superheat degree is smaller than the lower boundary value of the second preset range and the superheat degree is within a tenth preset range, the preset opening value is a second preset opening value.
Wherein, the first preset opening value may be, for example, 8 steps, and the second preset opening value may be, for example, 16 steps; the first preset current value may be, for example, 90% of the maximum current of the outdoor unit, and the second preset current value may be, for example, 85% of the maximum current of the outdoor unit; a1 may for example be 5 ℃, b1 may for example be 3 ℃, c1 may for example be 10 ℃, d1 may for example be 0 ℃; a2 may for example be 4 ℃, b2 may for example be 2 ℃, c2 may for example be 9 ℃ and d2 may for example be-1 ℃.
It can be understood by those skilled in the art that, although the present embodiment describes the technical solution of the present invention by taking the case of including two preset opening values as an example, the technical solution of the present invention is not limited to the case of including two preset opening values, and may include more preset opening values and preset current values corresponding thereto. By setting a plurality of preset opening values, the opening of the electronic expansion valve and the current of the outdoor unit can be more efficiently and accurately controlled, so that the superheat degree is kept in a reasonable range. When the superheat degree is detected to deviate from the reasonable range to be too large, the opening degree of the electronic expansion valve can be adjusted to a larger degree, so that the superheat degree can be more quickly close to or return to the reasonable range; when the superheat degree is detected to deviate from the reasonable range to be small, the opening degree of the electronic expansion valve can be adjusted to a small degree, so that the superheat degree accurately enters the reasonable range.
EXAMPLE III
Fig. 6 is a flow chart of a method for controlling an expansion valve of an air conditioning enhanced vapor injection system according to a preferred embodiment of the present invention. As shown in fig. 6, the present embodiment is different from the foregoing embodiments in that: before the change of the superheat degree is detected, the outdoor environment temperature is detected, and whether the auxiliary expansion valve is opened or not is determined according to the outdoor temperature. The method comprises the following steps of:
step S601 detects an outdoor ambient temperature.
Step S602, if the outdoor ambient temperature is greater than a preset temperature, the auxiliary electronic expansion valve is closed.
Step S603, if the outdoor ambient temperature is less than or equal to a preset temperature, opening the auxiliary electronic expansion valve to an initial opening degree after the compressor operates for a preset time, and detecting the superheat degree.
Wherein the preset temperature may be, for example, 15 ℃, the preset time may be, for example, 4 minutes, and the initial opening may be, for example, 96 steps.
Example four
Fig. 7 is a block diagram of an apparatus for controlling an expansion valve of an air conditioning enhanced vapor injection system according to a preferred embodiment of the present invention. As shown in fig. 7, an embodiment of the present invention provides an apparatus for controlling an expansion valve of an air conditioning enhanced vapor injection system, where the apparatus includes a superheat detection unit 701, a circuit detection unit 702, and a control unit 703.
Wherein, the superheat degree detection unit 701 is used for detecting the superheat degree variation of the compressor injection port, and the superheat degree detection unit may comprise temperature sensors EXV1 and EXV2 shown in fig. 1. The current detection unit 702 is used to detect the current of the outdoor unit of the air conditioner. The control unit 103 is configured to control the opening degree of the auxiliary electronic expansion valve according to the superheat degree and the current, and a control method of the control unit is similar to that described in the foregoing method embodiment, and is not described herein again. Preferably, the apparatus may further include an ambient temperature detection unit 704 for detecting an outdoor ambient temperature, and the control unit 703 is further configured to control the auxiliary electronic expansion valve according to the method described in the third embodiment.
In addition, the embodiment of the present invention also provides a machine-readable storage medium, which stores instructions for causing a machine to execute the method in the above-mentioned embodiment of the present invention.
Through the technical scheme, the low-temperature heating effect can be improved through an enhanced vapor injection technology, and meanwhile, the current of the outdoor unit and the auxiliary electronic expansion valve are controlled according to the superheat degree. Through the control to auxiliary road electronic expansion valve for the superheat degree of compressor injection port is in predetermineeing the within range (for example between 2 ~ 5 ℃), can guarantee to get back to can not be liquid refrigerant in the middling pressure chamber, guarantees the reliability of compressor, can guarantee again that the superheat degree can not be too big, increases the circulation volume of compressor, guarantees the effect of heating. The current of the outdoor unit is controlled, so that the problem that the current of the outdoor unit is too large due to too much injected refrigerant can be avoided, the fluctuation of a system can be reduced, and the reliability of the system is ensured.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solutions of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention do not describe every possible combination.
Those skilled in the art will appreciate that all or part of the steps in the method according to the above embodiments may be implemented by a program, which is stored in a storage medium and includes instructions for causing one or more single chip microcomputers, chips, or processors (processors) to execute all or part of the steps in the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In addition, any combination of various different implementation manners of the embodiments of the present invention is also possible, and the embodiments of the present invention should be considered as disclosed in the embodiments of the present invention as long as the combination does not depart from the spirit of the embodiments of the present invention.
Claims (13)
1. A method for controlling an expansion valve of an air conditioning enhanced vapor injection system, wherein the enhanced vapor injection system comprises a compressor, a first heat exchanger for enhanced vapor injection and an auxiliary electronic expansion valve, and the method comprises the following steps:
detecting a change in superheat of the compressor injection port;
when the superheat degree is not in a preset range, opening or closing the auxiliary electronic expansion valve for a preset opening value until the superheat degree is detected to be in the preset range;
when the auxiliary electronic expansion valve is determined to be opened by a preset opening value, detecting the current of the air conditioner outdoor unit;
when the current is smaller than a preset current value, continuously increasing the preset opening value of the auxiliary electronic expansion valve until the superheat degree is in the preset range;
and when the current is larger than a preset current value, reducing the frequency of the current until the current is lower than the preset current value, and continuing to increase the preset opening value of the auxiliary electronic expansion valve until the superheat degree is in the preset range.
2. The method of claim 1, wherein opening or closing the auxiliary electronic expansion valve by a preset opening value when the degree of superheat is not within a preset range comprises:
when the superheat degree is larger than the upper boundary value of the preset range, opening the preset opening value of the auxiliary electronic expansion valve;
and when the superheat degree is smaller than the lower boundary value of the preset range, closing the auxiliary electronic expansion valve for a preset opening value.
3. The method of claim 2 wherein the predetermined range includes a first predetermined range and a second predetermined range, the degree of superheat being compared to the first predetermined range during the degree of superheat ramp-up; in the superheat degree reducing process, the superheat degree is compared with a second preset range.
4. A method according to claim 2 or 3, characterized in that said preset opening values comprise a third plurality of preset opening values, different preset opening values being used depending on the range in which said degree of superheat is present during said degree of superheat rising and/or falling.
5. The method according to claim 4, wherein the preset current value comprises a plurality of preset current values, and the preset current values respectively correspond to the preset opening values.
6. The method of claim 1, further comprising:
detecting an outdoor ambient temperature before detecting the change in the degree of superheat;
if the outdoor environment temperature is higher than the preset temperature, closing the auxiliary electronic expansion valve;
and if the outdoor environment temperature is less than or equal to a preset temperature, opening the auxiliary electronic expansion valve to an initial opening degree after the compressor runs for a preset time, and detecting the superheat degree.
7. The utility model provides a device for controlling air conditioner enhanced vapor injection system expansion valve, enhanced vapor injection system includes the compressor, is used for the first heat exchanger and the auxiliary circuit electronic expansion valve of enhanced vapor injection, its characterized in that, the device includes:
a superheat degree detection unit for detecting a change in a superheat degree of the compressor injection port;
the current detection unit is used for detecting the current of the air conditioner outdoor unit;
a control unit for performing the following control:
detecting the change of the superheat degree through the superheat degree detection unit, and opening or closing the auxiliary electronic expansion valve to a preset opening value when the superheat degree is not in a preset range until the superheat degree is detected to be in the preset range;
when the auxiliary electronic expansion valve is opened to a preset opening value, the current of the air conditioner outdoor unit is detected through the current detection unit;
when the current is smaller than a preset current value, continuously increasing the preset opening value of the auxiliary electronic expansion valve until the superheat degree is in the preset range;
and when the current is larger than a preset current value, reducing the frequency of the current until the current is lower than the preset current value, and continuing to increase the preset opening value of the auxiliary electronic expansion valve until the superheat degree is in the preset range.
8. The apparatus of claim 7, wherein opening or closing the auxiliary electronic expansion valve by a preset opening value when the degree of superheat is not within a preset range comprises:
when the superheat degree is larger than the upper boundary value of the preset range, opening the preset opening value of the auxiliary electronic expansion valve;
and when the superheat degree is smaller than the lower boundary value of the preset range, closing the auxiliary electronic expansion valve for a preset opening value.
9. The apparatus according to claim 8, wherein the preset range includes a first preset range and a second preset range, and the degree of superheat is compared with the first preset range during the degree of superheat raising; in the superheat degree reducing process, the superheat degree is compared with a second preset range.
10. The apparatus according to claim 8 or 9, wherein the preset opening value includes a plurality of preset opening values, and different preset opening values are adopted according to the range of the superheat degree during the rise and/or fall of the superheat degree.
11. The apparatus of claim 10, wherein the preset current value comprises a plurality of preset current values, and the preset current values respectively correspond to the preset opening values.
12. The apparatus of claim 7, further comprising:
an ambient temperature detection unit for detecting an outdoor ambient temperature;
wherein, before detecting the change in the degree of superheat, the control unit is further configured to execute:
if the outdoor environment temperature is higher than the preset temperature, closing the auxiliary electronic expansion valve;
and if the outdoor environment temperature is less than or equal to the preset temperature, opening the auxiliary electronic expansion valve to an initial opening degree after the compressor runs for the preset time, and detecting the superheat degree through a superheat degree detection unit.
13. A machine-readable storage medium having stored thereon instructions for causing a machine to perform the method of any one of claims 1-6.
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| CN108362051A (en) * | 2018-02-08 | 2018-08-03 | 广东高而美制冷设备有限公司 | A kind of wide area increasing enthalpy method |
| CN112033054A (en) * | 2019-06-04 | 2020-12-04 | 广东芬尼克兹节能设备有限公司 | Electronic expansion valve control method, device and controller |
| CN110285618B (en) * | 2019-06-27 | 2020-03-27 | 山东建筑大学 | Frequency conversion control device and control method of heat pump |
| CN113970439B (en) * | 2020-07-24 | 2023-12-22 | 广东美的暖通设备有限公司 | Enthalpy-increasing jet system and auxiliary road valve body detection method and device thereof |
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