CN112665246B - Method and device for regulating and controlling electronic expansion valve and heat pump equipment - Google Patents
Method and device for regulating and controlling electronic expansion valve and heat pump equipment Download PDFInfo
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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
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Abstract
The application relates to a regulation and control method and device of an electronic expansion valve and heat pump equipment, and belongs to the technical field of regulation and control of the electronic expansion valve. The application includes: obtaining a current optimal opening degree fitting coefficient by utilizing the pressure difference and the current of the compressor under a preset standard working condition according to the current pressure difference and the current of the compressor; obtaining the current optimal opening degree by utilizing the optimal opening degree of the electronic expansion valve under the standard working condition according to the current optimal opening degree fitting coefficient; and adjusting the current opening degree of the electronic expansion valve according to the current optimal opening degree. Through this application, help promoting electronic expansion valve's regulation and control stability and shorten refrigerant system stabilization time.
Description
Technical Field
The application belongs to the technical field of electronic expansion valve regulation and control, and particularly relates to a regulation and control method and device of an electronic expansion valve and heat pump equipment.
Background
The heat pump unit can adjust the flow of the refrigerant through an electronic expansion valve, and taking an air conditioner as an example, the electronic expansion valve controls the flow of the refrigerant entering an evaporator, and determines the amount of the refrigerant entering a compressor. In the operation of the matched variable-volume compressor, the efficiency of the compressor can be fully exerted by the accurate opening control of the electronic expansion valve, and the stable operation of the unit is ensured while the system performance is improved.
In the related technology, control modes such as end temperature difference and superheat degree are adopted, the electronic expansion valve is controlled to be adjusted when the running state of the unit reaches a set value, and the method belongs to a threshold value comparison regulation mode.
Disclosure of Invention
In order to overcome the problems in the related art at least to a certain extent, the application provides a method and a device for regulating and controlling an electronic expansion valve and a heat pump device, which are beneficial to improving the regulation and control stability of the electronic expansion valve and shortening the regulation and control stability time of a refrigerant system.
In order to achieve the purpose, the following technical scheme is adopted in the application:
in a first aspect,
the application provides a regulation and control method of an electronic expansion valve, which comprises the following steps:
obtaining a current optimal opening degree fitting coefficient by utilizing the pressure difference and the current of the compressor under a preset standard working condition according to the current pressure difference and the current of the compressor;
obtaining the current optimal opening degree by utilizing the optimal opening degree of the electronic expansion valve under the standard working condition according to the current optimal opening degree fitting coefficient;
and regulating and controlling the current opening degree of the electronic expansion valve according to the current optimal opening degree.
Further, the method further comprises:
obtaining the discharge pressure and the suction pressure of the compressor, and obtaining the current pressure difference according to the discharge pressure and the suction pressure, an
And acquiring the current.
Further, the obtaining of the current optimal opening degree fitting coefficient by using the pressure difference and the current of the compressor under the preset standard working condition according to the current pressure difference and the current of the compressor includes:
obtaining the current optimal opening degree fitting coefficient according to a preset opening degree fitting coefficient model;
in the opening degree fitting coefficient model, the current and the pressure difference of the compressor under the standard working condition are configured to form a direct proportion relation with the current optimal opening degree fitting coefficient, and the current pressure difference and the current of the compressor under the standard working condition are configured to form an inverse proportion relation with the current optimal opening degree fitting coefficient.
Further, the opening degree fitting coefficient model includes:
wherein Y is the current optimum opening degree fitting coefficient, Δ PxIs the current pressure difference, IxIs the present current, Δ P0Is the pressure difference of the compressor under the standard working condition, I0The current of the compressor under the standard working condition is adopted.
Further, the method further comprises:
obtaining an opening fitting coefficient model according to the optimal opening of the electronic expansion valve corresponding to the optimal refrigerating capacity under different working conditions, by utilizing the relationship among the opening of the electronic expansion valve, the pressure difference of the compressor and the flow of a refrigerant and utilizing the relationship among the flow of the refrigerant, the refrigerating capacity and the current of the compressor;
the electronic expansion valve opening, the compressor pressure difference and the refrigerant flow are related as follows: the opening of the electronic expansion valve is in a direct proportion relation with the flow of a refrigerant, and the opening of the electronic expansion valve is in an inverse proportion relation with the pressure difference of the compressor;
the relationship among the refrigerant flow, the refrigerating capacity and the compressor current is as follows: the flow rate of the refrigerant, the refrigerating capacity and the current of the compressor are in a direct proportion relation.
Further, the relationship among the opening of the electronic expansion valve, the pressure difference of the compressor and the flow rate of the refrigerant is configured as follows:
wherein K is the opening degree of the electronic expansion valve, qmIs the refrigerant flow, Δ P is the compressor pressure differential, k is a constant, and ρ is the refrigerant density.
Further, obtaining the current optimal opening degree by using the optimal opening degree of the electronic expansion valve under the standard working condition according to the current optimal opening degree fitting coefficient includes:
using a predetermined formula K' ═ f (Y, K)0) Calculating to obtain the current optimal opening degree;
wherein K' is the current optimal opening, Y is the current optimal opening fitting coefficient, K0And the optimal opening degree of the electronic expansion valve under the standard working condition is obtained.
Further, K' ═ Y × K0。
In a second aspect of the present invention,
the application provides an electronic expansion valve's regulation and control device includes:
the first obtaining module is used for obtaining a current optimal opening degree fitting coefficient by utilizing the pressure difference and the current of the compressor under a preset standard working condition according to the current pressure difference and the current of the compressor;
the second obtaining module is used for obtaining the current optimal opening degree by utilizing the optimal opening degree of the electronic expansion valve under the standard working condition according to the current optimal opening degree fitting coefficient;
and the regulating and controlling module is used for regulating and controlling the current opening of the electronic expansion valve according to the current optimal opening.
In a third aspect of the present invention,
the application provides a heat pump apparatus comprising
One or more memories having executable programs stored thereon;
one or more processors configured to execute the executable program in the memory to implement the steps of any of the methods described above.
Further, the heat pump apparatus includes: air conditioner, heat pump water heater or heat pump refrigerator.
This application adopts above technical scheme, possesses following beneficial effect at least:
this application is according to current pressure differential and current of compressor, utilize the pressure differential and the current of compressor under the preset standard operating mode, obtain current best aperture fitting coefficient, then reuse the electronic expansion valve best aperture under the preset standard operating mode, combine current best aperture fitting coefficient, obtain current best aperture, regulate and control the current aperture of electronic expansion valve with this, can realize real-time accurate regulation and control, can overcome under the threshold value comparison regulation and control mode, probably there is the secondary interference to the system behind the electronic expansion valve action, lead to the regulation and control unbalance and make the unit get into the regulation and control state once more and increase system's regulation and control settling time, thereby this application can realize helping promoting electronic expansion valve's regulation and control stability and shorten refrigerant system regulation and control settling time.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart illustrating a method of regulating an electronic expansion valve in accordance with an exemplary embodiment;
FIG. 2 is a schematic diagram illustrating a regulating control device for an electronic expansion valve in accordance with an exemplary embodiment;
fig. 3 is a schematic diagram illustrating a heat pump apparatus according to an exemplary embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail below. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a flowchart illustrating a method for regulating an electronic expansion valve according to an exemplary embodiment, where as shown in fig. 1, the method for regulating an electronic expansion valve includes the following steps:
s101, obtaining a current optimal opening degree fitting coefficient by utilizing the pressure difference and the current of the compressor under a preset standard working condition according to the current pressure difference and the current of the compressor;
s102, obtaining the current optimal opening degree by utilizing the optimal opening degree of the electronic expansion valve under the standard working condition according to the current optimal opening degree fitting coefficient;
and step S103, regulating and controlling the current opening of the electronic expansion valve according to the current optimal opening.
Specifically, in the related art, control modes such as end temperature difference and superheat degree are adopted, the electronic expansion valve is controlled to be regulated and controlled based on the fact that the unit operation state reaches a set value, and the method belongs to a threshold value comparison regulation and control mode. The method belongs to a non-threshold comparison regulation and control mode, and according to the current pressure difference and the current of a compressor, the current optimal opening degree fitting coefficient is obtained by utilizing the pressure difference and the current of the compressor under the preset standard working condition, then the current optimal opening degree fitting coefficient is obtained by utilizing the optimal opening degree of an electronic expansion valve under the preset standard working condition and combining the current optimal opening degree fitting coefficient, so that the current opening degree of the electronic expansion valve is regulated and controlled, the current opening degree is adjusted to the current optimal opening degree, real-time accurate regulation and control can be realized, the regulation and control stability of the electronic expansion valve is improved, the regulation and control stable time of a refrigerant system is shortened, the problem that under the threshold comparison regulation and control mode, secondary interference possibly exists on the system after the electronic expansion valve acts, and regulation and control imbalance is caused, so that a unit enters a regulation state again to increase the regulation and control stable time of the system is overcome.
When the operating mode is unanimous, under the regulation and control mode of threshold value comparison, because of the amplitude of regulation of electron expansion valve is great relatively, lead to final aperture to appear great deviation easily, and under the above-mentioned scheme of this application, what realize is that real-time calculation regulation and control is a fine setting correction mode, and the amplitude of regulation of electron expansion valve is less relatively, and the precision of regulation and control is higher.
For standard conditions, in practical applications, the standard conditions may be established by specifically selecting the discharge pressure, suction pressure, and compressor current of the compressor, based on experimental selection. Under the selected standard working condition, calculating the pressure difference (exhaust pressure minus suction pressure) of the compressor, and recording the optimal opening degree of the electronic expansion valve under the standard working condition by adjusting the opening degree of the electronic expansion valve when the refrigerating capacity reaches the optimal degree.
In one embodiment, the method further comprises:
and acquiring the exhaust pressure and the suction pressure of the compressor, acquiring the current pressure difference according to the exhaust pressure and the suction pressure, and acquiring the current.
Specifically, the current pressure difference may be determined by subtracting the suction pressure from the discharge pressure. In the related art, in the aspect of electronic expansion valve control, pressure is converted into temperature control, for example, under superheat degree control, the pressure is converted into a saturation temperature formula, and deviation exists, so that data per se has deviation, and the opening degree regulation and control of the electronic expansion valve cannot be guaranteed to be accurate. Under the scheme, the exhaust pressure, the suction pressure and the current are directly measured, and the current differential pressure, the exhaust pressure and the suction pressure are pressure parameters in parameter types, belong to the same type of attribute, can avoid conversion among different types of attribute parameters, and can enable the control of the electronic expansion valve to be more accurate.
In one embodiment, obtaining a current optimal opening degree fitting coefficient by using the pressure difference and the current of the compressor under a preset standard working condition according to the current pressure difference and the current of the compressor comprises:
obtaining a current optimal opening degree fitting coefficient according to a preset opening degree fitting coefficient model;
in the opening degree fitting coefficient model, the current and the pressure difference of the compressor under the standard working condition are configured to form a direct proportion relation with the current optimal opening degree fitting coefficient, and the current of the compressor under the standard working condition are configured to form an inverse proportion relation with the current optimal opening degree fitting coefficient.
Specifically, in the opening degree fitting coefficient model, the influence action relationship of the current pressure difference and the current of the compressor and the influence action relationship of the pressure difference and the current of the compressor on the current optimal opening degree fitting coefficient under the standard working condition are configured, and the obtained opening degree fitting coefficient can be optimal under the configuration.
In one embodiment, obtaining the current optimal opening degree by using the optimal opening degree of the electronic expansion valve under the standard working condition according to the current optimal opening degree fitting coefficient includes:
using a predetermined formula K' ═ f (Y, K)0) For example, K' ═ Y × K0Calculating to obtain the current optimal opening degree;
wherein K' is the current optimal opening, Y is the current optimal opening fitting coefficient, K0Is electricity under standard working conditionThe sub-expansion valve has the optimal opening degree.
Specifically, under the selected standard working condition, the opening degree of the electronic expansion valve is adjusted, and when the refrigerating capacity reaches the optimum, the optimum opening degree of the electronic expansion valve under the standard working condition is recorded. According to the scheme, after the current optimal opening degree fitting coefficient is obtained by utilizing the pressure difference and the current of the compressor under the preset standard working condition according to the current pressure difference and the current of the compressor, the preset formula f (Y, K) is utilized0) And the current optimal opening degree fitting coefficient and the optimal opening degree of the electronic expansion valve under the standard working condition are combined in a correlation mode to obtain the current optimal opening degree, so that the refrigeration energy efficiency is optimal.
For K' ═ f (Y, K)0) In practical application, a correction coefficient may be further added to perform correction improvement, such as the above formula K ═ Y × K0The correction coefficient is 1.
Regarding the opening degree fitting coefficient model, the application further provides an implementation method of the opening degree fitting coefficient model.
In one embodiment, the method further comprises:
obtaining an opening degree fitting coefficient model according to the optimal opening degree of the electronic expansion valve corresponding to the optimal refrigerating capacity under different working conditions, by utilizing the relationship among the opening degree of the electronic expansion valve, the pressure difference of the compressor and the flow rate of a refrigerant and utilizing the relationship among the flow rate of the refrigerant, the refrigerating capacity and the current of the compressor;
the electronic expansion valve opening, the compressor differential pressure and the refrigerant flow rate have the following relations: the opening of the electronic expansion valve is in a direct proportion relation with the flow of a refrigerant, and the opening of the electronic expansion valve is in an inverse proportion relation with the pressure difference of the compressor;
the relationship among the refrigerant flow, the refrigerating capacity and the compressor current is as follows: the flow rate of the refrigerant, the refrigerating capacity and the current of the compressor are in a direct proportion relation.
Specifically, the optimal opening degree of the electronic expansion valve corresponding to the optimal refrigerating capacity under different working conditions can be realized by the following modes: the optimal opening degree of the electronic expansion valve under different arrangements is given out by arranging and combining the set according to the principle that the set correspondingly stipulates the exhaust pressure and the suction pressure of the compressor, the minimum to maximum operating current range, the pressing force and the current constant value are equally divided (by adjusting the opening degree of the electronic expansion valve, when the refrigerating capacity reaches the optimal degree, the optimal opening degree of the electronic expansion valve under the working condition is recorded). The constant value is divided into equal parts, which can be understood by the following examples, for example, the constant value is 1-10, and the constant value is divided into equal parts within the range of 1-10, such as two equal parts, four equal parts, etc.
Wherein, an optimal opening degree fitting coefficient can be obtained according to the relationship between the optimal opening degrees of the electronic expansion valves corresponding to the two working conditions, for example, according to the optimal opening degree K of the electronic expansion valve1And K2Obtaining an optimal opening degree fitting coefficient Y1Such as:
Y1＝K2/K1。
a plurality of optimal opening degree fitting coefficients can be obtained through each optimal opening degree, and then an opening degree fitting coefficient model is constructed by utilizing the relationship among the opening degree of the electronic expansion valve, the pressure difference of the compressor and the flow rate of a refrigerant and the relationship among the flow rate of the refrigerant, the refrigerating capacity and the current of the compressor.
In one embodiment, the relationship among the opening of the electronic expansion valve, the pressure difference of the compressor and the flow rate of the refrigerant is configured as follows:
wherein K is the opening degree of the electronic expansion valve, qmIs the refrigerant flow, Δ P is the compressor pressure differential, k is a constant, and ρ is the refrigerant density.
Under the above configuration, the opening K of the electronic expansion valve and the refrigerant flow q are formedmThe opening K of the electronic expansion valve is in direct proportion, and the opening K of the electronic expansion valve is in inverse proportion to the pressure difference delta P of the compressor.
Optimum opening degree K for two electronic expansion valves1And K2：
According to the above example: y is1＝K2/K1Further, it is possible to obtain:
based on the relationship among the refrigerant flow, the refrigerating capacity and the compressor current: the refrigerant flow rate, the refrigerating capacity and the compressor current are in direct proportion, and according to the direct proportion, the refrigerant flow rate qmCan be replaced by a compressor current I, resulting in:
wherein, I1Is qm1Corresponding current, I2Is qm2The corresponding current.
Further, the following opening degree fitting coefficient model can be obtained:
wherein Y is the current optimum opening degree fitting coefficient, delta PxIs the current pressure difference, IxIs the present current, Δ P0Is the pressure difference of the compressor under the standard working condition, I0The current of the compressor under the standard working condition is adopted.
According to the opening fitting coefficient model, the exhaust pressure, the suction pressure and the compressor current of the compressor can be specifically selected to form a standard working condition. And under the selected standard working condition, calculating the pressure difference of the compressor, and recording the optimal opening degree of the electronic expansion valve under the standard working condition by adjusting the opening degree of the electronic expansion valve when the refrigerating capacity reaches the optimal value. Then, the current differential pressure and the current are input, and the current optimal opening degree fitting coefficient can be output.
Note that, for the opening degree fitting coefficient model described above:
the above-mentioned obtaining process is only an exemplary illustration, and is not used to form a limitation on the opening degree fitting coefficient model of the present application, and it is only the opening degree fitting coefficient model of the present application: one specific example of this configuration is that the current and the pressure difference of the compressor under the standard operating condition are configured to form a direct relationship with the current optimum opening degree fitting coefficient, and the current of the compressor under the current pressure difference and the standard operating condition are configured to form an inverse relationship with the current optimum opening degree fitting coefficient.
Referring to fig. 2, fig. 2 is a schematic structural diagram illustrating an adjustment control device of an electronic expansion valve according to an exemplary embodiment, and as shown in fig. 2, the adjustment control device 2 of the electronic expansion valve includes:
the first obtaining module 201 is configured to obtain a current optimal opening degree fitting coefficient by using a pressure difference and a current of the compressor under a preset standard working condition according to a current pressure difference and a current of the compressor;
a second obtaining module 202, configured to obtain a current optimal opening degree by using an optimal opening degree of the electronic expansion valve under a standard working condition according to the current optimal opening degree fitting coefficient;
and the regulating and controlling module 203 is used for regulating and controlling the current opening degree of the electronic expansion valve according to the current optimal opening degree.
Further, the adjusting and controlling device 2 of the electronic expansion valve further comprises:
the acquisition module is used for acquiring the exhaust pressure and the suction pressure of the compressor, acquiring the current pressure difference according to the exhaust pressure and the suction pressure, and acquiring the current.
Further, the first obtaining module 201 is specifically configured to:
obtaining a current optimal opening degree fitting coefficient according to a preset opening degree fitting coefficient model;
in the opening degree fitting coefficient model, the current and the pressure difference of the compressor under the standard working condition are configured to form a direct proportion relation with the current optimal opening degree fitting coefficient, and the current of the compressor under the standard working condition are configured to form an inverse proportion relation with the current optimal opening degree fitting coefficient.
Further, the opening degree fitting coefficient model comprises:
wherein Y is the current optimum opening degree fitting coefficient, delta PxIs the current pressure difference, IxIs the present current, Δ P0Is the pressure difference of the compressor under the standard working condition, I0The current of the compressor under the standard working condition is adopted.
Further, the adjusting and controlling device 2 of the electronic expansion valve further comprises:
the third obtaining module is used for obtaining an opening fitting coefficient model according to the electronic expansion valve optimal opening corresponding to the optimal refrigerating capacity obtained under different working conditions, by utilizing the relationship among the electronic expansion valve opening, the compressor pressure difference and the refrigerant flow, and by utilizing the relationship among the refrigerant flow, the refrigerating capacity and the compressor current;
the electronic expansion valve opening, the compressor differential pressure and the refrigerant flow rate have the following relations: the opening of the electronic expansion valve is in a direct proportion relation with the flow of a refrigerant, and the opening of the electronic expansion valve is in an inverse proportion relation with the pressure difference of the compressor;
the relationship among the refrigerant flow, the refrigerating capacity and the compressor current is as follows: the flow rate of the refrigerant, the refrigerating capacity and the current of the compressor are in a direct proportion relation.
Further, the relationship among the opening of the electronic expansion valve, the pressure difference of the compressor and the flow rate of the refrigerant is configured as follows:
wherein K is the opening degree of the electronic expansion valve, qmThe refrigerant flow rate, Δ P, k, and ρ are the compressor differential pressure, constant, and the refrigerant density, respectively.
Further, the second obtaining module 202 is specifically configured to:
utilizing preset formula K'＝f(Y,K0) Calculating to obtain the current optimal opening degree;
wherein K' is the current optimal opening, Y is the current optimal opening fitting coefficient, K0The optimal opening degree of the electronic expansion valve under the standard working condition is obtained.
Further, wherein K' ═ Y × K0。
With regard to the regulating control device 2 of an electronic expansion valve in the above embodiment, the specific manner in which the respective modules perform operations has been described in detail in the embodiment related to the method, and will not be described in detail here.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a heat pump apparatus according to an exemplary embodiment, and as shown in fig. 3, the heat pump apparatus 3 includes:
one or more memories 301 having executable programs stored thereon;
one or more processors 302 for executing the executable programs in the memory 301 to implement the steps of any of the methods described above.
In practical applications, the heat pump apparatus 3 may include: air conditioners, heat pump water heaters, heat pump refrigerators and the like.
With regard to the heat pump apparatus 3 in the above-described embodiment, the specific manner in which the processor 302 executes the program in the memory 301 has been described in detail in the embodiment related to the method, and will not be described in detail here.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present application, the meaning of "plurality" means at least two unless otherwise specified.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present; when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present, and further, as used herein, connected may include wirelessly connected; the term "and/or" is used to include any and all combinations of one or more of the associated listed items.
Any process or method descriptions in flow charts or otherwise described herein may be understood as: represents modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present application includes additional implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following technologies, which are well known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware that is related to instructions of a program, and the program may be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a separate product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (9)
1. A method for regulating and controlling an electronic expansion valve is characterized by comprising the following steps:
acquiring the exhaust pressure and the suction pressure of a compressor, acquiring the current pressure difference according to the exhaust pressure and the suction pressure, and acquiring the current;
obtaining a current optimal opening degree fitting coefficient by utilizing the pressure difference and the current of the compressor under a preset standard working condition according to the current pressure difference and the current of the compressor, wherein the pressure difference of the compressor under the standard working condition is obtained by subtracting the suction pressure from the discharge pressure of the compressor under the selected standard working condition;
obtaining the current optimal opening degree by utilizing the optimal opening degree of the electronic expansion valve under the standard working condition according to the current optimal opening degree fitting coefficient;
regulating and controlling the current opening degree of the electronic expansion valve according to the current optimal opening degree;
wherein, according to the current pressure difference and the current of the compressor, the current optimal opening degree fitting coefficient is obtained by utilizing the pressure difference and the current of the compressor under the preset standard working condition, and the method comprises the following steps:
obtaining the current optimal opening degree fitting coefficient according to a preset opening degree fitting coefficient model;
in the opening degree fitting coefficient model, the current and the pressure difference of the compressor under the standard working condition are configured to form a direct proportion relation with the current optimal opening degree fitting coefficient, and the current pressure difference and the current of the compressor under the standard working condition are configured to form an inverse proportion relation with the current optimal opening degree fitting coefficient.
2. The method of claim 1, wherein the opening degree fit coefficient model comprises:
wherein Y is the current optimum opening degree fitting coefficient, Δ PxIs the current pressure difference, IxIs the present current, Δ P0Is the pressure difference of the compressor under the standard working condition, I0The current of the compressor under the standard working condition is adopted.
3. The method of claim 1, further comprising:
obtaining an opening fitting coefficient model according to the optimal opening of the electronic expansion valve corresponding to the optimal refrigerating capacity under different working conditions, by utilizing the relationship among the opening of the electronic expansion valve, the pressure difference of the compressor and the flow of a refrigerant and utilizing the relationship among the flow of the refrigerant, the refrigerating capacity and the current of the compressor;
the electronic expansion valve opening, the compressor differential pressure and the refrigerant flow rate have the following relations: the opening of the electronic expansion valve is in a direct proportion relation with the flow of a refrigerant, and the opening of the electronic expansion valve is in an inverse proportion relation with the pressure difference of the compressor;
the relationship among the refrigerant flow, the refrigerating capacity and the compressor current is as follows: the flow rate of the refrigerant, the refrigerating capacity and the current of the compressor are in a direct proportion relation.
4. The method of claim 3, wherein the relationship among the electronic expansion valve opening, the compressor pressure differential, and the refrigerant flow rate is configured to:
wherein K is the opening degree of the electronic expansion valve, qmIs the refrigerant flow, Δ P is the compressor pressure differential, k is a constant, and ρ is the refrigerant density.
5. The method according to claim 1, wherein obtaining the current optimal opening degree by using the optimal opening degree of the electronic expansion valve under the standard working condition according to the current optimal opening degree fitting coefficient comprises:
using a predetermined formula K' ═ f (Y, K)0) Calculating to obtain the current optimal opening degree;
wherein K' is the current optimal opening, Y is the current optimal opening fitting coefficient, K0And the optimal opening degree of the electronic expansion valve under the standard working condition is obtained.
6. The method of claim 5, wherein K' ═ Y x K0。
7. An adjustment control device of an electronic expansion valve is characterized by comprising:
the acquisition module is used for acquiring the exhaust pressure and the suction pressure of the compressor, acquiring the current pressure difference according to the exhaust pressure and the suction pressure, and acquiring the current;
the first obtaining module is used for obtaining a current optimal opening degree fitting coefficient by utilizing the pressure difference and the current of the compressor under a preset standard working condition according to the current pressure difference and the current of the compressor, wherein the pressure difference of the compressor under the standard working condition is obtained by subtracting the suction pressure from the discharge pressure of the compressor under a selected standard working condition;
the second obtaining module is used for obtaining the current optimal opening degree by utilizing the optimal opening degree of the electronic expansion valve under the standard working condition according to the current optimal opening degree fitting coefficient;
the regulating module is used for regulating and controlling the current opening of the electronic expansion valve according to the current optimal opening;
a first obtaining module specifically configured to:
obtaining a current optimal opening degree fitting coefficient according to a preset opening degree fitting coefficient model;
in the opening degree fitting coefficient model, the current and the pressure difference of the compressor under the standard working condition are configured to form a direct proportion relation with the current optimal opening degree fitting coefficient, and the current of the compressor under the standard working condition are configured to form an inverse proportion relation with the current optimal opening degree fitting coefficient.
8. A heat pump apparatus, comprising
One or more memories having executable programs stored thereon;
one or more processors configured to execute the executable program in the memory to implement the steps of the method of any one of claims 1-6.
9. The heat pump apparatus according to claim 8, characterized in that the heat pump apparatus comprises: air conditioner, heat pump water heater or heat pump refrigerator.
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| CN202011494229.7A CN112665246B (en) | 2020-12-17 | 2020-12-17 | Method and device for regulating and controlling electronic expansion valve and heat pump equipment |
| PCT/CN2021/109742 WO2022127126A1 (en) | 2020-12-17 | 2021-07-30 | Adjustment and control method and apparatus for electronic expansion valve, and heat pump device |
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| CN202011494229.7A CN112665246B (en) | 2020-12-17 | 2020-12-17 | Method and device for regulating and controlling electronic expansion valve and heat pump equipment |
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| CN112665246B (en) * | 2020-12-17 | 2022-05-17 | 珠海格力电器股份有限公司 | Method and device for regulating and controlling electronic expansion valve and heat pump equipment |
| CN115585565A (en) * | 2022-12-12 | 2023-01-10 | 顿汉布什(中国)工业有限公司 | Accurate control method for electric throttling mechanism of large-cooling-capacity centrifugal unit |
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| JP2006078146A (en) * | 2004-09-13 | 2006-03-23 | Chofu Seisakusho Co Ltd | Heat pump, floor heating device, and air conditioner |
| JP2006145087A (en) * | 2004-11-17 | 2006-06-08 | Denso Corp | Supercritical refrigeration cycle |
| CN101338948A (en) * | 2008-05-09 | 2009-01-07 | 浙江盾安人工环境设备股份有限公司 | Refrigeration system provided with electronic expansion valve opening control device |
| CN101901017B (en) * | 2009-05-27 | 2012-02-01 | 约克（无锡）空调冷冻设备有限公司 | Fuzzy control system and method of throttle mechanism |
| CN103033004B (en) * | 2011-09-29 | 2016-03-30 | 杭州三花研究院有限公司 | A kind of control method of automotive air-conditioning system electric expansion valve |
| CN103423836B (en) * | 2012-04-24 | 2018-03-13 | 杭州三花研究院有限公司 | Vehicle air conditioner control method for overheat and vehicle air conditioner |
| WO2016046876A1 (en) * | 2014-09-22 | 2016-03-31 | 三菱電機株式会社 | Refrigeration cycle device |
| CN105509387B (en) * | 2014-10-09 | 2018-04-03 | 青岛海尔空调电子有限公司 | Air-Cooled Heat Pump Unit and electronic expansion valve opening control method therein, air-conditioning |
| CN104457072B (en) * | 2014-11-20 | 2017-02-22 | 珠海格力电器股份有限公司 | Electronic expansion valve control method and device and refrigeration/heating system |
| CN105423667B (en) * | 2015-11-30 | 2018-03-30 | 珠海格力电器股份有限公司 | Control method of compressor system and compressor system |
| CN105402853B (en) * | 2015-12-07 | 2018-09-04 | Tcl空调器(中山)有限公司 | The control method and device of electric expansion valve |
| CN111765670A (en) * | 2019-04-02 | 2020-10-13 | 开利公司 | Electronic expansion valve, heat exchange system and method for controlling electronic expansion valve |
| CN111322801B (en) * | 2020-02-27 | 2021-05-11 | 广东志高暖通设备股份有限公司 | Control method and device of electronic expansion valve |
| CN112665246B (en) * | 2020-12-17 | 2022-05-17 | 珠海格力电器股份有限公司 | Method and device for regulating and controlling electronic expansion valve and heat pump equipment |
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