Control method, control device and heat pump system for a heat pump system

Abstract

The application provides a control method, a control device and a heat pump system, and the control method comprises the following steps: obtaining the exhaust temperature of a compressor; determining whether the exhaust temperature of the compressor meets a first set temperature condition; obtaining the supercooling degree of the economizer; and adjusting the main electronic expansion valve and / or the auxiliary electronic expansion valve according to the interval range of the supercooling degree of the economizer. The application provides a control method, a control device and a heat pump system, and the supercooling degree of the economizer is detected and determined when the exhaust temperature is too high and needs to be inhibited, the supercooling degree of the economizer is detected, the auxiliary valve is adjusted while the main valve is closed, the supercooling degree of the economizer is increased, the air supplement is increased, and the exhaust temperature is reduced.

Description

Technical Field

[0001] This invention relates to the field of electrical technology, and in particular to a control method, control device, and heat pump system for a heat pump system. Background Technology

[0002] In related technologies, existing heat pump systems typically reduce exhaust temperature by opening the main valve when the exhaust temperature is too high. While this method can reduce exhaust temperature in systems with enthalpy boosting, it also reduces the amount of auxiliary gas supplied due to the increased main circulation volume, thus affecting the overall system capacity. Therefore, this control method cannot achieve precise suppression of exhaust temperature.

[0003] Specifically, regarding the control methods in related technologies, after the unit enters the process of suppressing excessively high exhaust temperatures, since the main circuit electronic expansion valve no longer detects and judges the superheater and economizer superheat, adjusting the exhaust temperature by directly maintaining the main circuit electronic expansion valve may result in insufficient intake superheat, leading to a decrease in unit performance. Furthermore, the aforementioned method of maintaining the main circuit electronic expansion valve can also cause defects such as reduced auxiliary flow, insufficient make-up gas volume, and decreased unit capacity. Summary of the Invention

[0004] This invention provides a control method, control device, and heat pump system for a heat pump system, which addresses the deficiencies in the prior art and achieves the following technical effects: by adding an economizer subcooling detection and judgment, when the exhaust temperature is too high and needs to be suppressed, the economizer subcooling is detected, the main valve is closed and the auxiliary valve is adjusted to increase the economizer subcooling, thereby increasing the gas supply and reducing the exhaust temperature.

[0005] According to a first aspect of the present invention, a control method for a heat pump system includes a compressor, an evaporator, a condenser, and an economizer; the economizer has a first inlet, a second inlet, a first outlet, and a second outlet, wherein the first inlet is connected to the first outlet, and the second inlet is connected to the second outlet.

[0006] The condenser is connected to the first inlet via a main electronic expansion valve, the first outlet is connected to the evaporator, the condenser is connected to the second inlet via the main electronic expansion valve and the auxiliary electronic expansion valve, and the second outlet is connected to the gas supply port of the compressor.

[0007] The control method includes:

[0008] Obtain the compressor's discharge temperature;

[0009] Determine that the discharge temperature of the compressor meets the first set temperature condition, and obtain the subcooling degree of the economizer;

[0010] Adjust the main electronic expansion valve and / or the auxiliary electronic expansion valve according to the range of subcooling of the economizer.

[0011] According to one embodiment of the present invention, in determining that the exhaust temperature of the compressor meets a first set temperature condition and obtaining the subcooling of the economizer, the first set temperature condition is: the exhaust temperature of the compressor is greater than or equal to a first exhaust temperature and lasts for at least a first set duration.

[0012] According to an embodiment of the present invention, the step of adjusting the main electronic expansion valve and / or the auxiliary electronic expansion valve according to the subcooling range of the economizer specifically includes:

[0013] If the subcooling degree of the economizer is determined to be less than the first set subcooling degree, the opening degree of the main electronic expansion valve is controlled to decrease by the first reduction opening degree, and the opening degree of the auxiliary electronic expansion valve is controlled to decrease by the second reduction opening degree.

[0014] According to an embodiment of the present invention, the step of adjusting the main electronic expansion valve and / or the auxiliary electronic expansion valve according to the subcooling range of the economizer specifically includes:

[0015] If the subcooling degree of the economizer is determined to be greater than or equal to the first set subcooling degree and less than or equal to the second set subcooling degree, the opening degree of the main electronic expansion valve is controlled to decrease by the third reduction opening degree, and the opening degree of the auxiliary electronic expansion valve is controlled to decrease by the fourth reduction opening degree.

[0016] Wherein, the third reduction opening degree is smaller than the first reduction opening degree, and the fourth reduction opening degree is smaller than the second reduction opening degree.

[0017] According to one embodiment of the present invention, the third reduction opening degree and the fourth reduction opening degree are respectively positively correlated with the subcooling degree of the economizer.

[0018] According to an embodiment of the present invention, the step of adjusting the main electronic expansion valve and / or the auxiliary electronic expansion valve according to the subcooling range of the economizer specifically includes:

[0019] If the subcooling degree of the economizer is determined to be greater than the second set subcooling degree, the opening degree of the main electronic expansion valve is increased by the first incremental opening degree, and the opening degree of the auxiliary electronic expansion valve is increased by the second incremental opening degree.

[0020] According to one embodiment of the present invention, after the step of obtaining the exhaust temperature of the compressor, the control method of the heat pump system further includes:

[0021] Once the discharge temperature of the compressor is determined to meet the second set temperature condition, the opening of the auxiliary electronic expansion valve is controlled to be adjusted to the maximum.

[0022] The second set temperature condition is that the exhaust temperature of the compressor is greater than or equal to the second exhaust temperature and lasts for at least the second set duration, wherein the second exhaust temperature is greater than the first exhaust temperature.

[0023] According to one embodiment of the present invention, after the step of obtaining the exhaust temperature of the compressor, the control method of the heat pump system further includes:

[0024] Once the discharge temperature of the compressor is determined to meet the third set temperature condition, the opening of the main electronic expansion valve is controlled to be adjusted to the maximum.

[0025] The third set temperature condition is that the exhaust temperature of the compressor is greater than or equal to the third exhaust temperature and lasts for at least the third set duration, wherein the third exhaust temperature is greater than the second exhaust temperature.

[0026] According to one embodiment of the present invention, a first temperature sensor is provided at the first inlet and a second temperature sensor is provided at the first outlet;

[0027] The step of obtaining the subcooling degree of the economizer specifically includes:

[0028] The subcooling degree of the economizer is obtained based on the detection results of the first temperature sensor and the second temperature sensor.

[0029] According to a second aspect of the present invention, a control device for a heat pump system includes a compressor, an evaporator, a condenser, and an economizer; the economizer has a first inlet, a second inlet, a first outlet, and a second outlet, wherein the first inlet is connected to the first outlet, and the second inlet is connected to the second outlet;

[0030] The condenser is connected to the first inlet via a main electronic expansion valve, the first outlet is connected to the evaporator, the condenser is connected to the second inlet via the main electronic expansion valve and the auxiliary electronic expansion valve, and the second outlet is connected to the gas supply port of the compressor.

[0031] The control device includes:

[0032] The first acquisition module is used to acquire the exhaust temperature of the compressor;

[0033] The second acquisition module is used to determine that the exhaust temperature of the compressor meets the first set temperature condition and to acquire the subcooling of the economizer;

[0034] The control module is used to adjust the main electronic expansion valve and / or the auxiliary electronic expansion valve according to the range of subcooling of the economizer.

[0035] According to a third aspect of the present invention, a heat pump system includes a compressor, an evaporator, a condenser, and an economizer; the economizer has a first inlet, a second inlet, a first outlet, and a second outlet, wherein the first inlet is connected to the first outlet, and the second inlet is connected to the second outlet;

[0036] The condenser is connected to the first inlet via a main electronic expansion valve, the first outlet is connected to the evaporator, the condenser is connected to the second inlet via the main electronic expansion valve and the auxiliary electronic expansion valve, and the second outlet is connected to the gas supply port of the compressor.

[0037] The heat pump system also includes a control device for the heat pump system as described in the second aspect embodiment of the present invention.

[0038] An electronic device according to a fourth aspect of the present invention includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement a control method for a heat pump system as described in a first aspect of the present invention.

[0039] This invention provides a control method for a heat pump system. When the compressor's exhaust temperature meets a first set temperature condition, the method acquires the subcooling degree of the economizer and further adjusts the main electronic expansion valve and / or the auxiliary electronic expansion valve based on the subcooling degree. In summary, this method, by adding an economizer subcooling degree detection and determination, detects the economizer subcooling degree when the exhaust temperature is too high and needs to be suppressed. It closes the main valve and simultaneously adjusts the auxiliary valve to increase the economizer subcooling degree, thereby increasing the gas supply and reducing the exhaust temperature. Furthermore, this method is more effective and faster than existing temperature suppression methods. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0041] Figure 1 This is a flowchart illustrating the control method for the heat pump system provided by the present invention;

[0042] Figure 2 This is a schematic diagram of the structure of the control device for the heat pump system provided by the present invention;

[0043] Figure 3 This is a schematic diagram of the structure of the heat pump system provided by the present invention;

[0044] Figure 4This is a schematic diagram of the structure of the electronic device provided by the present invention.

[0045] Figure label:

[0046] 1. Compressor; 11. Air inlet; 2. Evaporator; 3. Condenser; 4. Economizer; 41. First inlet; 42. Second inlet; 43. First outlet; 44. Second outlet;

[0047] 51. Main electronic expansion valve; 52. Auxiliary electronic expansion valve; 61. First temperature sensor; 62. Second temperature sensor; 110. First acquisition module; 120. Second acquisition module; 130. Control module. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0049] The control method, control device, and heat pump system of the present invention are described below with reference to the accompanying drawings. Before detailing the embodiments of the present invention, the overall application scenario is described first. The control method, control device, electronic device, and computer-readable storage medium of the heat pump system of the present invention can be applied locally to the heat pump system, to cloud platforms in the Internet field, or to other types of cloud platforms in the Internet field, or to third-party devices. These third-party devices may include various types such as mobile phones, tablets, laptops, in-vehicle computers, and other smart terminals.

[0050] The following description uses only the control method applicable to air-cooled heat pump units as an example of a heat pump system. It should be understood that the control method of this embodiment can also be applied to other heat pump systems, cloud platforms, and third-party devices.

[0051] It should also be noted that the control method for the heat pump system proposed in this invention is universal, that is, this method is applicable to both cooling and heating of the heat pump system in low-temperature or high-temperature environments. For ease of description, the following will use the cooling of the heat pump system as an example.

[0052] Before introducing the control method of the first aspect of the present invention, the structure on which the control method is based is first described: as follows Figure 3As shown, the heat pump system includes a compressor 1, an evaporator 2, a condenser 3, and an economizer 4. The economizer 4 has a first inlet 41, a second inlet 42, a first outlet 43, and a second outlet 44. The first inlet 41 is connected to the first outlet 43, and the second inlet 42 is connected to the second outlet 44. The condenser 3 is connected to the first inlet 41 via a main electronic expansion valve 51, and to the evaporator 2 via the first outlet 43. The condenser 3 is connected to the second inlet 42 via the main electronic expansion valve 51 and an auxiliary electronic expansion valve 52, and to the second outlet 44 via the gas supply port 11 of the compressor 1.

[0053] like Figure 1 As shown, a control method for a heat pump system according to a first aspect embodiment of the present invention includes:

[0054] Step S1: Obtain the exhaust temperature of compressor 1;

[0055] Step S2: Determine that the discharge temperature of compressor 1 meets the first set temperature condition, and obtain the subcooling of economizer 4.

[0056] Step S3: Adjust the main electronic expansion valve 51 and / or the auxiliary electronic expansion valve 52 according to the range of subcooling of the economizer 4.

[0057] According to the control method of the heat pump system of the present invention, the specific working process is as follows: First, the controller obtains the exhaust temperature of the compressor 1. After obtaining the exhaust temperature of the compressor 1, the controller analyzes the exhaust temperature and determines whether the current exhaust temperature meets the first set temperature condition. If it does, the controller further obtains the subcooling of the economizer 4. After obtaining the subcooling of the economizer 4, the controller adjusts the main electronic expansion valve 51 and / or the auxiliary electronic expansion valve 52 according to the range of the subcooling of the economizer 4.

[0058] In related technologies, existing heat pump systems typically reduce exhaust temperature by opening the main valve when the exhaust temperature is too high. While this method can reduce exhaust temperature in systems with enthalpy boosting, it also reduces the amount of auxiliary gas supplied due to the increased main circulation volume, thus affecting the overall system capacity. Therefore, this control method cannot achieve precise suppression of exhaust temperature.

[0059] Specifically, regarding the control methods in related technologies, after the unit enters the process of suppressing excessively high exhaust temperatures, since the main circuit electronic expansion valve no longer detects and judges the superheater and economizer superheat, adjusting the exhaust temperature by directly maintaining the main circuit electronic expansion valve may result in insufficient intake superheat, leading to a decrease in unit performance. Furthermore, the aforementioned method of maintaining the main circuit electronic expansion valve can also cause defects such as reduced auxiliary flow, insufficient make-up gas volume, and decreased unit capacity.

[0060] Therefore, in order to solve the technical defects existing in the above-mentioned related technologies, the present invention provides a control method for a heat pump system. When the exhaust temperature of the compressor 1 meets the first set temperature condition, the method obtains the subcooling of the economizer 4, and further adjusts the main electronic expansion valve 51 and / or the auxiliary electronic expansion valve 52 according to the subcooling. In summary, this method increases the subcooling detection of the economizer 4. When the exhaust temperature is too high and needs to be suppressed, the subcooling of the economizer 4 is detected, the main valve is closed and the auxiliary valve is adjusted at the same time to increase the subcooling of the economizer 4, thereby increasing the gas supply and reducing the exhaust temperature. In addition, this method is more effective and faster than the existing temperature suppression methods.

[0061] According to some embodiments of the present invention, in determining that the discharge temperature of the compressor 1 meets the first set temperature condition and obtaining the subcooling of the economizer 4, the first set temperature condition is: the discharge temperature of the compressor 1 is greater than or equal to the first discharge temperature and lasts for at least the first set duration.

[0062] The first exhaust temperature and the first set duration mentioned above are both preset values, which can be obtained through the default settings in the system or through other means. This invention does not impose any special limitations on the method of obtaining the first exhaust temperature and the first set duration or their specific values.

[0063] For example, the first set temperature condition is: the exhaust temperature of compressor 1 is greater than or equal to 105°C and lasts for at least 5 seconds. That is, when the exhaust temperature of compressor 1 is greater than 105°C and lasts for at least 5 seconds, the controller will further obtain the subcooling of economizer 4 and adjust the opening of main electronic expansion valve 51 and / or auxiliary electronic expansion valve 52 according to the subcooling.

[0064] According to some embodiments of the present invention, the step of adjusting the main electronic expansion valve 51 and / or the auxiliary electronic expansion valve 52 according to the subcooling range of the economizer 4 specifically includes:

[0065] If the subcooling degree of the economizer 4 is determined to be less than the first set subcooling degree, the opening degree of the main electronic expansion valve 51 is controlled to decrease the first reduction opening degree, and the opening degree of the auxiliary electronic expansion valve 52 is controlled to decrease the second reduction opening degree.

[0066] The first set subcooling degree, the first reduction opening degree, and the second reduction opening degree are all preset values, which can be obtained through the default settings in the system or through other methods. This invention does not impose any special limitations on the acquisition method or specific value of the first set subcooling degree, the first reduction opening degree, and the second reduction opening degree.

[0067] According to some embodiments of the present invention, the step of adjusting the main electronic expansion valve 51 and / or the auxiliary electronic expansion valve 52 according to the subcooling range of the economizer 4 specifically includes:

[0068] If the subcooling degree of the economizer 4 is determined to be greater than or equal to the first set subcooling degree and less than or equal to the second set subcooling degree, the opening degree of the main electronic expansion valve 51 is controlled to decrease to the third reduction opening degree, and the opening degree of the auxiliary electronic expansion valve 52 is controlled to decrease to the fourth reduction opening degree.

[0069] Among them, the third reduction opening degree is smaller than the first reduction opening degree, and the fourth reduction opening degree is smaller than the second reduction opening degree.

[0070] The second set subcooling degree, the third reduction opening degree, and the fourth reduction opening degree are all preset values. They can be obtained through the default settings in the system or through other methods. This invention does not impose any special limitations on the acquisition method or specific value of the second set subcooling degree, the third reduction opening degree, and the fourth reduction opening degree.

[0071] Furthermore, in the steps described above, based on the fact that the subcooling degree of the economizer 4 is greater than or equal to the first set subcooling degree and less than or equal to the second set subcooling degree, the opening degree of the main electronic expansion valve 51 is reduced by the third reduction opening degree, and the opening degree of the auxiliary electronic expansion valve 52 is reduced by the fourth reduction opening degree, the third reduction opening degree and the fourth reduction opening degree are positively correlated with the subcooling degree of the economizer 4.

[0072] That is, when the subcooling of the economizer 4 is within the range of the first set subcooling to the second set subcooling, the greater the subcooling, the greater the size of the third reduction opening and the fourth reduction opening that need to be adjusted.

[0073] According to some embodiments of the present invention, the step of adjusting the main electronic expansion valve 51 and / or the auxiliary electronic expansion valve 52 according to the subcooling range of the economizer 4 specifically includes:

[0074] If the subcooling of the economizer 4 is determined to be greater than the second set subcooling, the opening of the main electronic expansion valve 51 is increased by the first incremental opening, and the opening of the auxiliary electronic expansion valve 52 is increased by the second incremental opening.

[0075] According to some embodiments of the present invention, after obtaining the exhaust temperature of compressor 1, the control method of the heat pump system further includes:

[0076] Once the discharge temperature of compressor 1 is determined to meet the second set temperature condition, the opening of auxiliary electronic expansion valve 52 is adjusted to the maximum.

[0077] The second set temperature condition is that the exhaust temperature of compressor 1 is greater than or equal to the second exhaust temperature and lasts for at least the second set duration, and the second exhaust temperature is greater than the first exhaust temperature.

[0078] The second exhaust temperature and the second set duration mentioned above are both preset values, which can be obtained through the default settings in the system or through other means. This invention does not impose any special limitations on the acquisition method or specific value of the second exhaust temperature and the second set duration.

[0079] For example, the second set temperature condition is: the exhaust temperature of compressor 1 is greater than 110°C and lasts for at least 5 seconds. That is, when the exhaust temperature of compressor 1 is greater than 110°C and lasts for at least 5 seconds, the controller will control the opening of the auxiliary electronic expansion valve 52 to be adjusted to the maximum, thereby suppressing the exhaust temperature of compressor 1 from continuing to increase.

[0080] According to some embodiments of the present invention, after obtaining the exhaust temperature of compressor 1, the control method of the heat pump system further includes:

[0081] Once the discharge temperature of compressor 1 is determined to meet the third set temperature condition, the opening of the main electronic expansion valve 51 is adjusted to the maximum.

[0082] The third set temperature condition is that the exhaust temperature of compressor 1 is greater than or equal to the third exhaust temperature and lasts for at least the third set duration, and the third exhaust temperature is greater than the second exhaust temperature.

[0083] The aforementioned third exhaust temperature and third set duration are both preset values, which can be obtained through the system's default settings or through other means. This invention does not impose any special limitations on the method of obtaining the third exhaust temperature and the specific value of the third set duration.

[0084] For example, the third set temperature condition is: the exhaust temperature of compressor 1 is greater than 115°C and lasts for at least 5 seconds. That is, when the exhaust temperature of compressor 1 is greater than 115°C and lasts for at least 5 seconds, the controller will control the opening of the main electronic expansion valve 51 to be adjusted to the maximum, thereby suppressing the exhaust temperature of compressor 1 from continuing to increase.

[0085] According to some embodiments of the present invention, in the control method of the heat pump system, when the controller determines that the exhaust temperature of the compressor 1 has dropped to less than 105°C, the controller will control the air conditioner to exit the above control method and end the adjustment of the main electronic expansion valve 51 and / or the auxiliary electronic expansion valve 52.

[0086] According to some embodiments of the present invention, a first temperature sensor 61 is provided at the first inlet 41 and a second temperature sensor 62 is provided at the first outlet 43.

[0087] The steps for obtaining the subcooling of economizer 4 specifically include:

[0088] The subcooling of the economizer 4 is obtained based on the detection results of the first temperature sensor 61 and the second temperature sensor 62.

[0089] In this embodiment, the subcooling degree of the economizer 4 is obtained through the first temperature sensor 61 and the second temperature sensor 62. This allows for convenient adjustment of the main electronic expansion valve 51 and / or the auxiliary electronic expansion valve 52 based on the subcooling degree of the economizer 4 in subsequent control processes, thereby achieving the purpose of suppressing the exhaust temperature of the compressor 1. Specifically, the subcooling degree of the economizer is equal to the difference between the detection results of the first temperature sensor and the second temperature sensor.

[0090] The control device for the heat pump system provided by the present invention is described below. The control device for the heat pump system described below can be referred to in correspondence with the control method for the heat pump system described above.

[0091] According to a second aspect of the present invention, the control device for a heat pump system includes a compressor 1, an evaporator 2, a condenser 3, and an economizer 4; the economizer 4 has a first inlet 41, a second inlet 42, a first outlet 43, and a second outlet 44, wherein the first inlet 41 is connected to the first outlet 43, and the second inlet 42 is connected to the second outlet 44.

[0092] The condenser 3 is connected to the first inlet 41 via the main electronic expansion valve 51, and the first outlet 43 is connected to the evaporator 2. The condenser 3 is connected to the second inlet 42 via the main electronic expansion valve 51 and the auxiliary electronic expansion valve 52, and the second outlet 44 is connected to the gas supply port 11 of the compressor 1.

[0093] like Figure 2 As shown, the control device includes:

[0094] The first acquisition module 110 is used to acquire the exhaust temperature of the compressor 1;

[0095] The second acquisition module 120 is used to determine that the exhaust temperature of the compressor 1 meets the first set temperature condition and to acquire the subcooling of the economizer 4.

[0096] The control module 130 is used to adjust the main electronic expansion valve 51 and / or the auxiliary electronic expansion valve 52 according to the range of subcooling of the economizer 4.

[0097] like Figure 3 As shown, according to a third aspect embodiment of the present invention, the heat pump system includes a compressor 1, an evaporator 2, a condenser 3, and an economizer 4; the economizer 4 has a first inlet 41, a second inlet 42, a first outlet 43, and a second outlet 44, the first inlet 41 being connected to the first outlet 43, and the second inlet 42 being connected to the second outlet 44.

[0098] The condenser 3 is connected to the first inlet 41 via the main electronic expansion valve 51, and the first outlet 43 is connected to the evaporator 2. The condenser 3 is connected to the second inlet 42 via the main electronic expansion valve 51 and the auxiliary electronic expansion valve 52, and the second outlet 44 is connected to the gas supply port 11 of the compressor 1.

[0099] The heat pump system also includes a control device for the heat pump system as described in the second aspect of the present invention.

[0100] According to the control device and heat pump system of the heat pump system of the present invention, when it is determined that the exhaust temperature of the compressor 1 meets the first set temperature condition, the subcooling of the economizer 4 is obtained, and the main electronic expansion valve 51 and / or the auxiliary electronic expansion valve 52 are further adjusted according to the subcooling. In summary, the present invention increases the subcooling detection and determination of the economizer 4. When the exhaust temperature is too high and needs to be suppressed, the subcooling of the economizer 4 is detected, the main valve is closed and the auxiliary valve is adjusted at the same time to increase the subcooling of the economizer 4, thereby increasing the gas supply and reducing the exhaust temperature. In addition, this method is more effective and faster than the existing temperature suppression methods.

[0101] Figure 4 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 4 As shown, the electronic device may include a processor 810, a communication interface 820, a memory 830, and a communication bus 840, wherein the processor 810, the communication interface 820, and the memory 830 communicate with each other through the communication bus 840. The processor 810 can call logic instructions in the memory 830 to execute a control method for the heat pump system, the method including: acquiring the exhaust temperature of the compressor 1; determining that the exhaust temperature of the compressor 1 meets a first set temperature condition; acquiring the subcooling degree of the economizer 4; and adjusting the main electronic expansion valve 51 and / or the auxiliary electronic expansion valve 52 according to the range of the subcooling degree of the economizer 4.

[0102] Furthermore, the logical instructions in the aforementioned memory 830 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0103] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute a control method for a heat pump system. The method includes: acquiring the exhaust temperature of the compressor 1; determining that the exhaust temperature of the compressor 1 meets a first set temperature condition; acquiring the subcooling of the economizer 4; and adjusting the main electronic expansion valve 51 and / or the auxiliary electronic expansion valve 52 according to the range of the subcooling of the economizer 4.

[0104] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a control method for a heat pump system, the method comprising: acquiring the exhaust temperature of compressor 1; determining that the exhaust temperature of compressor 1 meets a first set temperature condition; acquiring the subcooling of economizer 4; and adjusting the main electronic expansion valve 51 and / or the auxiliary electronic expansion valve 52 according to the range of subcooling of economizer 4.

[0105] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0106] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods of various embodiments or some parts of embodiments.

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A control method of a heat pump system, characterized by, The heat pump system comprises a compressor, an evaporator, a condenser and an economizer; the economizer has a first inlet, a second inlet, a first outlet and a second outlet, the first inlet is communicated with the first outlet, the second inlet is communicated with the second outlet; The condenser is connected with the first inlet through a main electronic expansion valve, the first outlet is connected with the evaporator, the condenser is connected with the second inlet through the main electronic expansion valve and an auxiliary electronic expansion valve, and the second outlet is communicated with a gas supplement port of the compressor; The control method comprises: obtaining the exhaust temperature of the compressor; determining that the exhaust temperature of the compressor meets a first set temperature condition, and obtaining the supercooling degree of the economizer; adjusting the main electronic expansion valve and / or the auxiliary electronic expansion valve according to the interval range in which the supercooling degree of the economizer is located.

2. The control method of a heat pump system according to claim 1, characterized by, In the step of determining that the exhaust temperature of the compressor meets the first set temperature condition and obtaining the supercooling degree of the economizer, the first set temperature condition is that the exhaust temperature of the compressor is greater than or equal to a first exhaust temperature and lasts for at least a first set time length.

3. The control method of a heat pump system according to claim 2, characterized by, The step of adjusting the main electronic expansion valve and / or the auxiliary electronic expansion valve according to the interval range in which the supercooling degree of the economizer is located specifically comprises: determining that the supercooling degree of the economizer is less than a first set supercooling degree, controlling the opening degree of the main electronic expansion valve to decrease by a first decrement opening degree, and controlling the opening degree of the auxiliary electronic expansion valve to decrease by a second decrement opening degree.

4. The control method of a heat pump system according to claim 3, characterized by, The step of adjusting the main electronic expansion valve and / or the auxiliary electronic expansion valve according to the interval range in which the supercooling degree of the economizer is located specifically comprises: determining that the supercooling degree of the economizer is greater than or equal to the first set supercooling degree and less than or equal to a second set supercooling degree, controlling the opening degree of the main electronic expansion valve to decrease by a third decrement opening degree, and controlling the opening degree of the auxiliary electronic expansion valve to decrease by a fourth decrement opening degree; wherein the third decrement opening degree is less than the first decrement opening degree, and the fourth decrement opening degree is less than the second decrement opening degree.

5. The control method of a heat pump system according to claim 4, characterized by, The third decrement opening degree and the fourth decrement opening degree are respectively positively correlated with the supercooling degree of the economizer.

6. The control method of a heat pump system according to claim 4, characterized by, The step of adjusting the main electronic expansion valve and / or the auxiliary electronic expansion valve according to the interval range in which the supercooling degree of the economizer is located specifically comprises: determining that the supercooling degree of the economizer is greater than a second set supercooling degree, controlling the opening degree of the main electronic expansion valve to increase by a first increment opening degree, and controlling the opening degree of the auxiliary electronic expansion valve to increase by a second increment opening degree.

7. The control method of a heat pump system according to any one of claims 2 to 6, characterized by, After the step of obtaining the exhaust temperature of the compressor, the method further comprises: determining that the exhaust temperature of the compressor meets a second set temperature condition, and controlling the opening degree of the auxiliary electronic expansion valve to be adjusted to the maximum; wherein the second set temperature condition is that the exhaust temperature of the compressor is greater than or equal to a second exhaust temperature and lasts for at least a second set time length, and the second exhaust temperature is greater than the first exhaust temperature.

8. The control method of a heat pump system according to claim 7, characterized by, After the step of obtaining the exhaust temperature of the compressor, the method further comprises: determining that the exhaust temperature of the compressor meets a third set temperature condition, and controlling the opening degree of the main electronic expansion valve to be adjusted to the maximum; The third set temperature condition is that the exhaust temperature of the compressor is greater than or equal to a third exhaust temperature and lasts for at least a third set time length, and the third exhaust temperature is greater than the second exhaust temperature.

9. A control device of a heat pump system, characterized by comprising: The heat pump system comprises a compressor, an evaporator, a condenser and an economizer; the economizer has a first inlet, a second inlet, a first outlet and a second outlet, the first inlet is communicated with the first outlet, and the second inlet is communicated with the second outlet; The condenser is connected with the first inlet through a main electronic expansion valve, the first outlet is connected with the evaporator, the condenser is connected with the second inlet through the main electronic expansion valve and an auxiliary electronic expansion valve, and the second outlet is communicated with a gas supplement port of the compressor; The control device comprises: A first acquisition module is configured to acquire an exhaust temperature of the compressor. A second acquisition module is configured to determine that the exhaust temperature of the compressor meets a first set temperature condition and acquire a supercooling degree of the economizer. A control module is configured to adjust the main electronic expansion valve and / or the auxiliary electronic expansion valve according to an interval range in which the supercooling degree of the economizer is located.

10. A heat pump system, characterized by, The heat pump system comprises a compressor, an evaporator, a condenser and an economizer; the economizer has a first inlet, a second inlet, a first outlet and a second outlet, the first inlet is communicated with the first outlet, and the second inlet is communicated with the second outlet; The condenser is connected with the first inlet through a main electronic expansion valve, the first outlet is connected with the evaporator, the condenser is connected with the second inlet through the main electronic expansion valve and an auxiliary electronic expansion valve, and the second outlet is communicated with a gas supplement port of the compressor; The heat pump system further comprises the control device of the heat pump system according to claim 9.

11. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor executes the program to implement the control method of the heat pump system according to any one of claims 1 to 8.

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