Compressor gas supply control methods, devices and air conditioning units

Abstract

This invention discloses a compressor gas replenishment control method, device, and air conditioning unit. The method includes: acquiring compressor operating parameters; calculating the opening degree of the gas replenishment electronic expansion valve based on the operating parameters; acquiring the compressor type; determining the influencing factor of the gas replenishment electronic expansion valve opening degree based on the compressor type; and correcting the gas replenishment electronic expansion valve opening degree according to the influencing factor; and controlling the operation of the gas replenishment electronic expansion valve according to the corrected opening degree. This invention solves the problem of insufficient precision or delay in compressor gas replenishment control in the prior art, enabling the compressor gas replenishment process to be fast and precise, and approaching the compressor's optimal energy efficiency state in real time.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more specifically, to a compressor gas supply control method, device, and air conditioning unit. Background Technology

[0002] Refrigeration units that use the principle of incomplete cooling in the intermediate stage of compression with gas injection enthalpy enhancement generally employ a thermostatic expansion valve or electronic expansion valve in the gas injection circuit of the unit to throttle the gas before heat exchange in the compressor's gas injection circuit, thereby increasing the subcooling of the liquid in the main circuit. The gas that has undergone heat exchange after throttling enters the compressor for gas injection.

[0003] The first scheme, using a thermal expansion valve, employs a pressure balancing pipe to detect the pressure in the gas supply pipe and an integrated temperature sensor in the expansion valve to detect the actual temperature of the gas supply pipe. The valve opening is controlled by comparing the detected actual pressure with the pressure inside the temperature sensor, based on the internal spring force of the thermal expansion valve, ultimately ensuring a certain degree of gas supply superheat. This scheme is simple, but its response speed is slow and its adjustment is inaccurate. The second scheme, using an electronic expansion valve, uses a pressure sensor to detect the pressure in the gas supply pipe and an integrated temperature sensor to detect the temperature of the gas supply pipe. After converting the pressure to a saturation temperature, the gas supply superheat is calculated and compared with the gas supply pipe temperature to control the opening of the electronic expansion valve. This scheme has a faster response speed, but it is more complex, more expensive, and the temperature parameters are affected by factors such as the heat transfer coefficient and ambient temperature, resulting in delays and deviations.

[0004] There is currently no effective solution to the problem of insufficient precision or delay in compressor gas supply control in related technologies. Summary of the Invention

[0005] This invention provides a compressor gas replenishment control method, device, and air conditioning unit to at least solve the problems of insufficient accuracy or delay in compressor gas replenishment control in the prior art.

[0006] To address the aforementioned technical problems, according to one aspect of the present invention, a compressor gas replenishment control method is provided, wherein a gas replenishment electronic expansion valve is provided on the gas replenishment branch of the compressor. The method includes: acquiring the operating parameters of the compressor; calculating the opening degree of the gas replenishment electronic expansion valve based on the operating parameters; acquiring the type of the compressor; determining the influencing factor of the opening degree of the gas replenishment electronic expansion valve based on the type of the compressor; correcting the opening degree of the gas replenishment electronic expansion valve based on the influencing factor; and controlling the operation of the gas replenishment electronic expansion valve according to the corrected opening degree of the gas replenishment electronic expansion valve.

[0007] Furthermore, the compressor type includes at least the compressor capacity type; determining the influence factor of the opening degree of the gas supply electronic expansion valve according to the compressor type, and correcting the opening degree of the gas supply electronic expansion valve according to the influence factor, including: determining a first influence factor according to the compressor capacity type; and correcting the opening degree of the gas supply electronic expansion valve according to the first influence factor.

[0008] Furthermore, the compressor type also includes the compressor pressure ratio type; determining the influencing factor of the opening degree of the gas supply electronic expansion valve according to the compressor type, and correcting the opening degree of the gas supply electronic expansion valve according to the influencing factor, further includes: after correcting the opening degree of the gas supply electronic expansion valve according to the first influencing factor, determining the second influencing factor according to the compressor pressure ratio type; and correcting the opening degree of the gas supply electronic expansion valve again according to the second influencing factor.

[0009] Furthermore, the capacity type includes at least an adjustable capacity type and a non-adjustable capacity type; determining the first influencing factor based on the compressor's capacity type includes: when the compressor is of the adjustable capacity type, obtaining the compressor's operating current and determining the first influencing factor based on the operating current; when the compressor is of the non-adjustable capacity type, determining the first influencing factor to be 0; correcting the opening degree of the gas replenishment electronic expansion valve based on the first influencing factor includes: adding the opening degree of the gas replenishment electronic expansion valve to the first influencing factor.

[0010] Furthermore, the first influencing factor is determined based on the operating current, including: calculating the first influencing factor y2 according to the following formula: y2=b1+b2*i+b3*i^2+b4*i^3, where i is the operating current, and b1, b2, b3, and b4 are coefficients that are set corresponding to the compressor model.

[0011] Furthermore, the pressure ratio type includes at least an adjustable pressure ratio type and a non-adjustable pressure ratio type; determining the second influencing factor based on the compressor's pressure ratio type includes: when the compressor is a non-adjustable pressure ratio type, obtaining the compressor's pressure ratio and determining the second influencing factor based on the pressure ratio; when the compressor is a pressure ratio adjustable type, determining the second influencing factor to be 1; and correcting the opening of the gas-injection electronic expansion valve again based on the second influencing factor, including: multiplying the corrected opening of the gas-injection electronic expansion valve by the second influencing factor.

[0012] Further, the second influencing factor is determined based on the pressure ratio, including: when the pressure ratio is less than a preset threshold, the second influencing factor y3 is determined to be 0; when the pressure ratio is greater than or equal to the preset threshold, the second influencing factor y3 is calculated by the following formula: y3=c1+c2*(x1 / x2), where x1 / x2 is the pressure ratio, and c1 and c2 are coefficients that are set corresponding to the compressor model.

[0013] Furthermore, the operating parameters include at least the compressor's suction pressure and discharge pressure. The opening degree of the electronic expansion valve for replenishing gas is calculated based on the operating parameters, including: calculating the opening degree y1 of the electronic expansion valve for replenishing gas according to the following formula: y1=a1+a2*(x1-x2)+a3*(x1-x2)^2+a4*(x1-x2)^3, where x1 is the discharge pressure, x2 is the suction pressure, and a1, a2, a3, and a4 are coefficients and are set corresponding to the type of compressor.

[0014] According to another aspect of the present invention, a compressor gas replenishment control device is provided, wherein a gas replenishment electronic expansion valve is provided on the gas replenishment branch of the compressor. The device includes: a calculation module for acquiring the operating parameters of the compressor and calculating the opening degree of the gas replenishment electronic expansion valve based on the operating parameters; a correction module for acquiring the type of the compressor, determining the influencing factor of the opening degree of the gas replenishment electronic expansion valve based on the type of the compressor, and correcting the opening degree of the gas replenishment electronic expansion valve based on the influencing factor; and a control module for controlling the operation of the gas replenishment electronic expansion valve according to the corrected opening degree of the gas replenishment electronic expansion valve.

[0015] According to another aspect of the present invention, an air conditioning unit is provided, including the compressor gas supply control device as described above.

[0016] According to another aspect of the present invention, a storage medium containing computer-executable instructions is provided, which, when executed by a computer processor, are used to perform the compressor gas injection control method as described above.

[0017] In this invention, an electronic expansion valve for gas replenishment is installed on the gas replenishment branch of the compressor. Based on this electronic expansion valve, the gas replenishment flow rate is adjusted. During the adjustment process, the opening degree of the electronic expansion valve is first calculated based on the compressor's operating parameters. Then, the compressor type is obtained, and the influencing factor of the opening degree of the electronic expansion valve is determined according to the compressor type. The opening degree of the electronic expansion valve is then corrected according to the influencing factor. The corrected opening degree of the electronic expansion valve is the optimal opening degree, thereby enabling the electronic expansion valve to operate at the optimal opening degree and approach the compressor's optimal energy efficiency state in real time. This effectively solves the problem of insufficient precision or delay in compressor gas replenishment control, making the compressor's gas replenishment process fast and accurate. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of an optional structure of an air conditioning unit according to an embodiment of the present invention;

[0019] Figure 2 This is an optional flowchart of a compressor gas injection control method according to an embodiment of the present invention;

[0020] Figure 3This is an optional structural block diagram of a compressor gas injection control device according to an embodiment of the present invention.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Compressor; 2. Condenser; 3. Evaporator; 4. Economizer; 5. Main throttle valve; 6. Electronic expansion valve for gas injection; 7. Suction pressure sensor; 8. Discharge pressure sensor; 9. Current sensor. Detailed Implementation

[0023] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the invention as detailed in the appended claims.

[0024] Example 1

[0025] In a preferred embodiment of the present invention, a compressor gas replenishment control method is provided, which can be directly applied to various air conditioning units with gas replenishment branches. Figure 1 This diagram illustrates one possible structural design of an air conditioner, such as... Figure 1 As shown, it includes: compressor 1, condenser 2, evaporator 3, economizer 4, main throttle valve 5, and electronic expansion valve 6. The control system components are: suction pressure sensor 7, discharge pressure sensor 8, and current sensor 9, which mainly control the operation of the compressor, main throttle valve, and electronic expansion valve of the refrigeration unit.

[0026] High-pressure refrigerant is discharged from the compressor and flows into the condenser for condensation. The liquid refrigerant flowing out of the condenser is divided into two parts. The larger portion of the main refrigerant, after being subcooled by the economizer, flows into the evaporator through a throttling process. The other portion of the refrigerant, after being throttled and depressurized by the make-up gas electronic expansion valve, exchanges heat in the economizer, and the resulting flash vapor enters the compressor's central make-up gas port, mixes with the gas in the compressor's suction port after it has been sealed, and then enters the compressor for further compression. The portion of the main refrigerant flowing into the evaporator is subcooled, thus increasing the cooling capacity. After evaporating and absorbing heat in the evaporator, the main refrigerant re-enters the cycle through the compressor's suction port.

[0027] In the economizer gas replenishment process, the refrigerant liquid in the gas replenishment circuit is throttled by the gas replenishment electronic expansion valve, causing the liquid to absorb heat and evaporate into gas, which is then sent into the intermediate gas replenishment port of the compressor.

[0028] For screw compressors, when an economizer injection port is installed in the rotor meshing direction, under specified operating conditions, a higher refrigerant mass flow rate in the injection port leads to a higher injection pressure and a higher system cooling capacity, but also a higher actual shaft power consumption. Conversely, a lower refrigerant mass flow rate in the injection port results in a lower system cooling capacity, a shorter compression process after injection, and reduced shaft power consumption. Since the rates of increase and decrease in cooling capacity and shaft power are inconsistent, for a refrigeration system with a defined suction and discharge pressure, there exists an optimal refrigerant mass flow rate in the injection port (COP, cooling capacity to shaft power ratio), and the optimal opening degree of the injection electronic expansion valve is achieved at this flow rate.

[0029] To achieve the optimal opening degree of the electronic expansion valve for gas replenishment, this invention also provides a compressor gas replenishment control method, specifically... Figure 2 An optional flowchart of the method is shown, such as Figure 2 As shown, the method includes the following steps S202-S206:

[0030] S202: Obtain the compressor's operating parameters and calculate the opening degree of the electronic expansion valve for gas replenishment based on the operating parameters;

[0031] S204: Obtain the compressor type, determine the influencing factor of the opening degree of the electronic expansion valve based on the compressor type, and correct the opening degree of the electronic expansion valve based on the influencing factor;

[0032] S206: Control the operation of the electronic expansion valve according to the opening degree of the modified electronic expansion valve.

[0033] In the above embodiment, an electronic expansion valve for gas replenishment is installed on the gas replenishment branch of the compressor. Based on this electronic expansion valve, the gas replenishment flow rate is adjusted. During the adjustment process, the opening degree of the electronic expansion valve for gas replenishment is first calculated based on the operating parameters of the compressor. Then, the type of the compressor is obtained, and the influencing factor of the opening degree of the electronic expansion valve for gas replenishment is determined according to the type of the compressor. The opening degree of the electronic expansion valve for gas replenishment is then corrected according to the influencing factor. The corrected opening degree of the electronic expansion valve for gas replenishment is the optimal opening degree, so that the electronic expansion valve for gas replenishment operates at the optimal opening degree, which approaches the optimal energy efficiency state of the compressor in real time. This effectively solves the problem of insufficient precision or delay in compressor gas replenishment control, and makes the gas replenishment process of the compressor fast and accurate.

[0034] In a preferred embodiment of the present invention, the compressor's operating parameters include at least the compressor's suction pressure and discharge pressure. The opening degree of the electronic expansion valve is calculated based on these operating parameters, including: calculating the opening degree y1 of the electronic expansion valve according to the following formula: y1=a1+a2*(x1-x2)+a3*(x1-x2)^2+a4*(x1-x2)^3, where x1 is the discharge pressure, x2 is the suction pressure, and a1, a2, a3, and a4 are coefficients corresponding to the compressor type. Suction and discharge pressures are parameters that can be quickly detected and have a fast response time. The present invention uses parameters such as suction and discharge pressures that provide immediate response to quickly control the electronic expansion valve to precisely adjust it to the optimal energy efficiency opening under the current operating conditions, thus approaching the compressor's optimal energy efficiency state in real time.

[0035] After determining the opening degree of the gas-injection electronic expansion valve, this opening degree is further modified. Specifically, the compressor type includes at least the compressor capacity type. The influencing factor of the opening degree of the gas-injection electronic expansion valve is determined according to the compressor type, and the opening degree of the gas-injection electronic expansion valve is modified according to the influencing factor, including: determining the first influencing factor according to the compressor capacity type; and modifying the opening degree of the gas-injection electronic expansion valve according to the first influencing factor.

[0036] The capacity type includes at least adjustable and non-adjustable types. For compressors with adjustable capacity, there is a minimum capacity for gas replenishment. The current *i* gradually increases from the minimum capacity to 100% full load capacity, and the current influence factor is corrected accordingly. For compressors without adjustable capacity, their influence is ignored, and the current influence factor is not increased. Specifically, the first influence factor is determined based on the compressor's capacity type, including: when the compressor is of the adjustable capacity type, obtaining the compressor's operating current and determining the first influence factor based on the operating current, including: calculating the first influence factor y2 according to the following formula: y2=b1+b2*i+b3*i^2+b4*i^3, where i is the operating current, and b1, b2, b3, and b4 are coefficients corresponding to the compressor model; when the compressor is of the non-adjustable capacity type, the first influence factor is determined to be 0.

[0037] After determining the first influencing factor, the opening of the air replenishment electronic expansion valve is corrected according to the first influencing factor, including: adding the opening of the air replenishment electronic expansion valve to the first influencing factor, that is, the corrected opening = y1 + y2.

[0038] Preferably, the compressor type also includes the compressor pressure ratio type; determining the influence factor of the opening degree of the gas supply electronic expansion valve according to the compressor type, and correcting the opening degree of the gas supply electronic expansion valve according to the influence factor, further includes: after correcting the opening degree of the gas supply electronic expansion valve according to the first influence factor, determining the second influence factor according to the compressor pressure ratio type; and correcting the opening degree of the gas supply electronic expansion valve again according to the second influence factor.

[0039] The pressure ratio type includes at least two types: adjustable pressure ratio and non-adjustable pressure ratio. The second influencing factor is determined based on the compressor's pressure ratio type, including: when the compressor is of the non-adjustable pressure ratio type, obtaining the compressor's pressure ratio and determining the second influencing factor based on the pressure ratio; and when the compressor is of the adjustable pressure ratio type, determining the second influencing factor to be 1.

[0040] Since the internal pressure ratio of a compressor is generally not adjustable, under conditions where the pressure ratio (x1 / x2) is small, the compressor is in an over-compression state, resulting in decreased compressor efficiency. After the economizer's gas supply circuit opens, the compressor's exhaust flow increases, causing a sharp increase in shaft power due to overcompression. Furthermore, the smaller the pressure ratio (x1 / x2), the larger the gas supply mass flow rate, and the more significant the increase in shaft power due to overcompression. Until the pressure ratio (x1 / x2) falls below a certain value, the compressor's gas supply circuit opens, but the performance coefficient actually decreases. Therefore, a minimum pressure ratio α1 is set, i.e., a preset threshold. When the calculated actual pressure ratio (x1 / x2) < α1, the gas supply electronic expansion valve closes, thus determining the second influencing factor y3 to be 0. When the calculated actual pressure ratio (x1 / x2) ≥ α1, the opening degree of the gas supply electronic expansion valve is calculated using the following formula: y3 = c1 + c2 * (x1 / x2), where x1 / x2 is the pressure ratio, and c1 and c2 are coefficients corresponding to the compressor model.

[0041] After determining the second influencing factor, the opening degree of the air replenishment electronic expansion valve is corrected again based on the second influencing factor, including multiplying the corrected opening degree of the air replenishment electronic expansion valve by the second influencing factor.

[0042] For compressors with adjustable capacity but non-adjustable pressure ratio, the corrected optimal opening degree is y = y3*(y1+y2). Therefore, based on the suction pressure, discharge pressure, and compressor operating current, the injection gas mass flow rate can be controlled through a single injection gas electronic expansion valve, achieving the optimal COP (Coefficient of Performance) for the injection gas electronic expansion valve across all operating conditions within the compressor's operating range.

[0043] As shown in the background description, existing technologies for electronic expansion valves for gas replenishment involve two methods. Both methods utilize detected temperature and pressure to determine the superheat of the replenished gas, and then apply throttling control to ensure reliable compressor operation. However, both methods suffer from lag and inaccuracy, meaning they do not provide optimal cooling capacity / performance.

[0044] The first method uses a thermal expansion valve, which is a mechanical control system. A thermal expansion valve, equipped with a built-in temperature sensor and pressure balancing pipe, is installed before the economizer. The temperature sensor is located on the gas supply pipe after the economizer to detect the gas supply temperature. The pressure balancing pipe is connected to the gas supply pipe after the economizer to detect the gas supply pressure. Based on the detected gas supply pressure, the internal pressure of the temperature sensor corresponding to the gas supply temperature, and the spring force inside the thermal expansion valve, the valve opening is controlled to ultimately ensure a certain degree of gas supply superheat.

[0045] The second type is an electronic expansion valve, which is electronically controlled. Temperature and pressure sensors are installed on the gas supply line after the economizer. The pressure sensor detects the gas supply line pressure, and the temperature sensor detects the gas supply line temperature. The pressure is converted to saturation temperature, and then compared with the gas supply line temperature to calculate the gas supply superheat, which controls the throttling opening of the electronic expansion valve. This solution is more complex and costly, but it has a faster response time and more precise opening adjustment.

[0046] This invention represents a further improvement on the electronic expansion valve method. It eliminates the need for temperature sensors, pressure sensors, or related detection on the gas injection pipe, and only uses conventional detection points such as suction pressure, discharge pressure, and current to establish the relationship between the unit's optimal cooling capacity / performance operating state under different operating conditions and the conventional detection points. This relationship is reflected in the calculation of influencing factors, ultimately yielding the optimal opening value of the gas injection electronic expansion valve. At this opening, the compressor's optimal cooling capacity / energy efficiency state can be approximated, while ensuring reliable compressor operation.

[0047] Example 2

[0048] Based on the compressor gas supply control method provided in Embodiment 1 above, a compressor gas supply control device is also provided in a preferred embodiment 2 of the present invention. Specifically, Figure 3 An alternative structural block diagram of the device is shown, such as... Figure 3 As shown, the device includes:

[0049] The calculation module 302 is used to obtain the operating parameters of the compressor and calculate the opening degree of the electronic expansion valve for gas replenishment based on the operating parameters;

[0050] The correction module 304, connected to the calculation module 302, is used to obtain the type of compressor, determine the influence factor of the opening degree of the gas replenishment electronic expansion valve according to the type of compressor, and correct the opening degree of the gas replenishment electronic expansion valve according to the influence factor.

[0051] The control module 306, connected to the correction module 304, is used to control the operation of the electronic expansion valve according to the corrected opening degree of the electronic expansion valve.

[0052] In the above embodiment, an electronic expansion valve for gas replenishment is installed on the gas replenishment branch of the compressor. Based on this electronic expansion valve, the gas replenishment flow rate is adjusted. During the adjustment process, the opening degree of the electronic expansion valve for gas replenishment is first calculated based on the operating parameters of the compressor. Then, the type of the compressor is obtained, and the influencing factor of the opening degree of the electronic expansion valve for gas replenishment is determined according to the type of the compressor. The opening degree of the electronic expansion valve for gas replenishment is then corrected according to the influencing factor. The corrected opening degree of the electronic expansion valve for gas replenishment is the optimal opening degree, so that the electronic expansion valve for gas replenishment operates at the optimal opening degree, which approaches the optimal energy efficiency state of the compressor in real time. This effectively solves the problem of insufficient precision or delay in compressor gas replenishment control, and makes the gas replenishment process of the compressor fast and accurate.

[0053] The compressor type includes at least the compressor capacity type; the correction module 304 includes: a first determining submodule, used to determine a first influencing factor according to the compressor capacity type; and a first correction submodule, used to correct the opening degree of the gas replenishment electronic expansion valve according to the first influencing factor.

[0054] The compressor type also includes the compressor pressure ratio type; the correction module 304 further includes: a second determining submodule, used to determine a second influencing factor according to the compressor pressure ratio type after correcting the opening degree of the gas replenishment electronic expansion valve according to the first influencing factor; and a second correction submodule, used to correct the opening degree of the gas replenishment electronic expansion valve again according to the second influencing factor.

[0055] Preferably, the capacity type includes at least an adjustable capacity type and a non-adjustable capacity type; the first determining submodule includes: a first determining unit, used to acquire the operating current of the compressor when the compressor is of the adjustable capacity type, and determine a first influencing factor based on the operating current; and a second determining unit, used to determine that the first influencing factor is 0 when the compressor is of the non-adjustable capacity type.

[0056] The first correction submodule includes: a first correction unit, used to add the opening degree of the air replenishment electronic expansion valve to a first influence factor.

[0057] The first determining unit includes: calculating the first influencing factor y2 according to the following formula: y2=b1+b2*i+b3*i^2+b4*i^3, where i is the operating current, and b1, b2, b3, and b4 are coefficients that are set corresponding to the compressor model.

[0058] Preferably, the pressure ratio type includes at least an adjustable pressure ratio type and a non-adjustable pressure ratio type; the second determining submodule includes: a third determining unit, used to obtain the pressure ratio of the compressor when the compressor is a non-adjustable pressure ratio type, and determine a second influencing factor based on the pressure ratio; and a fourth determining unit, used to determine the second influencing factor as 1 when the compressor is a pressure ratio adjustable type.

[0059] The second correction submodule includes: a second correction unit, used to multiply the corrected opening degree of the air replenishment electronic expansion valve by a second influencing factor.

[0060] The third determining unit includes: a first determining subunit, used to determine the second influencing factor y3 as 0 when the pressure ratio is less than a preset threshold; and a second determining subunit, used to calculate the second influencing factor y3 by the following formula when the pressure ratio is greater than or equal to the preset threshold: y3=c1+c2*(x1 / x2), where x1 / x2 is the pressure ratio, and c1 and c2 are coefficients that are set corresponding to the compressor model.

[0061] Optionally, the compressor's operating parameters include at least the compressor's suction pressure and discharge pressure. The calculation module 302 includes: calculating the opening degree y1 of the supplementary air electronic expansion valve according to the following formula: y1=a1+a2*(x1-x2)+a3*(x1-x2)^2+a4*(x1-x2)^3, where x1 is the discharge pressure, x2 is the suction pressure, and a1, a2, a3, and a4 are coefficients and are set corresponding to the type of compressor.

[0062] Regarding the apparatus in the above embodiments, the specific manner in which each unit and module performs its operations has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0063] Example 3

[0064] Based on the compressor gas replenishment control device provided in Embodiment 2 above, an air conditioning unit is also provided in a preferred embodiment 3 of the present invention, including the compressor gas replenishment control device as described above.

[0065] The structural diagram of the air conditioning unit is shown below. Figure 1 As shown, it includes: compressor 1, condenser 2, evaporator 3, economizer 4, main throttle valve 5, electronic expansion valve 6, suction pressure sensor 7, discharge pressure sensor 8, and current sensor 9.

[0066] In the above embodiment, an electronic expansion valve for gas replenishment is installed on the gas replenishment branch of the compressor. Based on this electronic expansion valve, the gas replenishment flow rate is adjusted. During the adjustment process, the opening degree of the electronic expansion valve for gas replenishment is first calculated based on the operating parameters of the compressor. Then, the type of the compressor is obtained, and the influencing factor of the opening degree of the electronic expansion valve for gas replenishment is determined according to the type of the compressor. The opening degree of the electronic expansion valve for gas replenishment is then corrected according to the influencing factor. The corrected opening degree of the electronic expansion valve for gas replenishment is the optimal opening degree, so that the electronic expansion valve for gas replenishment operates at the optimal opening degree, which approaches the optimal energy efficiency state of the compressor in real time. This effectively solves the problem of insufficient precision or delay in compressor gas replenishment control, and makes the gas replenishment process of the compressor fast and accurate.

[0067] Example 4

[0068] Based on the compressor gas replenishment control method provided in Embodiment 1 above, in a preferred embodiment 4 of the present invention, a storage medium containing computer-executable instructions is also provided, which, when executed by a computer processor, are used to execute the compressor gas replenishment control method as described above.

[0069] In the above embodiment, an electronic expansion valve for gas replenishment is installed on the gas replenishment branch of the compressor. Based on this electronic expansion valve, the gas replenishment flow rate is adjusted. During the adjustment process, the opening degree of the electronic expansion valve for gas replenishment is first calculated based on the operating parameters of the compressor. Then, the type of the compressor is obtained, and the influencing factor of the opening degree of the electronic expansion valve for gas replenishment is determined according to the type of the compressor. The opening degree of the electronic expansion valve for gas replenishment is then corrected according to the influencing factor. The corrected opening degree of the electronic expansion valve for gas replenishment is the optimal opening degree, so that the electronic expansion valve for gas replenishment operates at the optimal opening degree, which approaches the optimal energy efficiency state of the compressor in real time. This effectively solves the problem of insufficient precision or delay in compressor gas replenishment control, and makes the gas replenishment process of the compressor fast and accurate.

[0070] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not invented by the invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0071] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A compressor gas supply control method, characterized in that, An electronic expansion valve for gas supply is installed on the gas supply branch of the compressor, and the method includes: Obtain the compressor's operating parameters, and calculate the opening degree of the gas replenishment electronic expansion valve based on the operating parameters; Obtain the type of the compressor, determine the influence factor of the opening degree of the gas replenishment electronic expansion valve based on the type of the compressor, and correct the opening degree of the gas replenishment electronic expansion valve based on the influence factor; The operation of the electronic expansion valve is controlled according to the modified opening degree of the electronic expansion valve.

2. The method according to claim 1, characterized in that, The compressor type includes at least the compressor capacity type; determining the influence factor of the opening degree of the electronic expansion valve based on the compressor type, and correcting the opening degree of the electronic expansion valve based on the influence factor, including: The first influencing factor is determined based on the capacity type of the compressor; The opening degree of the gas replenishment electronic expansion valve is corrected based on the first influencing factor.

3. The method according to claim 2, characterized in that, The compressor type also includes the compressor's pressure ratio type; determining the influence factor of the opening degree of the electronic expansion valve based on the compressor type, and correcting the opening degree of the electronic expansion valve based on the influence factor, further includes: After correcting the opening degree of the gas replenishment electronic expansion valve according to the first influencing factor, the second influencing factor is determined according to the pressure ratio type of the compressor; The opening degree of the air replenishment electronic expansion valve is corrected again based on the second influencing factor.

4. The method according to claim 2, characterized in that, The capacity types include at least adjustable capacity types and non-adjustable capacity types; The first influencing factor is determined based on the capacity type of the compressor, including: When the compressor is of the capacity adjustable type, the operating current of the compressor is obtained, and a first influencing factor is determined based on the operating current; When the compressor is of the non-adjustable capacity type, the first influencing factor is determined to be 0; Correcting the opening of the gas replenishment electronic expansion valve according to the first influencing factor includes: adding the opening of the gas replenishment electronic expansion valve to the first influencing factor.

5. The method according to claim 4, characterized in that, The first influencing factor is determined based on the operating current, including: The first influencing factor y2 is calculated according to the following formula: y2=b1+b2*i+b3*i^2+b4*i^3, where i is the operating current, and b1, b2, b3, and b4 are coefficients that are set according to the model of the compressor.

6. The method according to claim 3, characterized in that, The pressure ratio type includes at least an adjustable pressure ratio type and a non-adjustable pressure ratio type; the second influencing factor is determined based on the pressure ratio type of the compressor, including: When the compressor is of the type with non-adjustable pressure ratio, the pressure ratio of the compressor is obtained, and the second influencing factor is determined based on the pressure ratio; When the compressor is of the pressure ratio adjustable type, the second influencing factor is determined to be 1; The opening degree of the gas replenishment electronic expansion valve is corrected again based on the second influencing factor, including multiplying the corrected opening degree of the gas replenishment electronic expansion valve by the second influencing factor.

7. The method according to claim 6, characterized in that, Determining the second influencing factor based on the pressure ratio includes: When the pressure ratio is less than a preset threshold, the second influencing factor y3 is determined to be 0; When the pressure ratio is greater than or equal to the preset threshold, the second influencing factor y3 is calculated by the following formula: y3=c1+c2*(x1 / x2), where x1 / x2 is the pressure ratio, and c1 and c2 are coefficients that are set according to the model of the compressor.

8. The method according to claim 1, characterized in that, The operating parameters include at least the compressor's suction pressure and discharge pressure. The opening degree of the electronic expansion valve is calculated based on these operating parameters, including: The opening degree y1 of the electronic expansion valve for gas replenishment is calculated according to the following formula: y1 = a1 + a2*(x1-x2) + a3*(x1-x2)^2 + a4*(x1-x2)^3, where x1 is the exhaust pressure, x2 is the intake pressure, and a1, a2, a3, and a4 are coefficients that correspond to the type of the compressor.

9. A compressor gas supply control device, characterized in that, An electronic expansion valve for gas supply is installed on the gas supply branch of the compressor. The device includes: The calculation module is used to obtain the operating parameters of the compressor and calculate the opening degree of the gas replenishment electronic expansion valve based on the operating parameters; The correction module is used to obtain the type of the compressor, determine the influence factor of the opening degree of the gas replenishment electronic expansion valve according to the type of the compressor, and correct the opening degree of the gas replenishment electronic expansion valve according to the influence factor. The control module is used to control the operation of the electronic expansion valve according to the modified opening degree of the electronic expansion valve.

10. An air conditioning unit, characterized in that, Includes the compressor gas supply control device as described in claim 9.

11. A storage medium containing computer-executable instructions, characterized in that, The computer-executable instructions, when executed by a computer processor, are used to perform the compressor gas replenishment control method as described in any one of claims 1 to 8.

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