Control method and device for heat pump system, heat pump system and computer readable storage medium

Abstract

The application relates to the technical field of heat pumps, and discloses a control method for a heat pump system, the heat pump system comprising an air conditioner heat exchanger and a floor heating capillary which are arranged in parallel, a three-way valve being arranged at the communication position of the inlet side of the air conditioner heat exchanger and the inlet side of the floor heating capillary, and a control valve being arranged at the outlet side of the floor heating capillary; the method comprises the following steps: in the case that the heat pump system is started to heat, the three-way valve is controlled to be connected to the floor heating capillary, and the control valve is controlled to be closed, so that part of refrigerant is stored in the floor heating capillary; after a first storage time, the three-way valve is controlled to be connected to the air conditioner heat exchanger, so that the heat pump system is operated in a heating mode. According to the application, the excess refrigerant is stored in the floor heating capillary in advance before the heating mode is operated, the amount of refrigerant which is subsequently introduced into the air conditioner heat exchanger to participate in the heating cycle is appropriate, the exhaust temperature can be improved, and the system energy efficiency can be ensured. The application further discloses a control device for the heat pump system, a heat pump system and a computer readable storage medium.

Description

Technical Field

[0001] This application relates to the field of heat pump technology, such as a control method, apparatus, and heat pump system for a heat pump system, and a computer-readable storage medium. Background Technology

[0002] Currently, in dual-supply systems of underfloor heating and air conditioning, because the volume of the underfloor heating pipe assembly is generally larger than that of the air conditioning indoor unit, the amount of refrigerant stored in the underfloor heating pipe assembly after the system shuts down is usually much greater than that in the air conditioning indoor unit. When the system shuts down, the temperature difference between indoors and outdoors usually causes the refrigerant to gradually migrate from the high-temperature side to the low-temperature side, resulting in a large amount of refrigerant stored in the underfloor heating pipe assembly migrating to the outdoor side. If the system is then started for heating via the air conditioning indoor unit, there is a high risk of excessive refrigerant circulating in the system, leading to a relatively low compressor discharge temperature. This also prevents the system from reaching its optimal operating state, resulting in reduced system energy efficiency and affecting the heating capacity of the heat pump system. Therefore, related technologies propose storing excess refrigerant in a receiver tank when there is excess refrigerant.

[0003] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:

[0004] When the system load changes, the relevant technology requires a long time to discharge the refrigerant from the storage tank, causing the heat pump system to be unable to respond quickly to heating demands.

[0005] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0006] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0007] This disclosure provides a control method, device, and computer-readable storage medium for a heat pump system, which ensures that the amount of refrigerant entering the air conditioning heat exchanger to participate in the heating cycle is appropriate and can respond to heating demands in a timely manner, thereby better protecting the user's heating experience.

[0008] In some embodiments, the heat pump system includes an air conditioning heat exchanger and a floor heating capillary tube connected in parallel. A three-way valve is provided at the connection between the inlet side of the air conditioning heat exchanger and the inlet side of the floor heating capillary tube, and a control valve is provided at the outlet side of the floor heating capillary tube. The control method includes: when the heat pump system is started in heating mode, controlling the three-way valve to open to the floor heating capillary tube and controlling the control valve to close, so as to store a portion of the refrigerant in the floor heating capillary tube; after a first storage period, controlling the three-way valve to open to the air conditioning heat exchanger, so as to make the heat pump system operate in heating mode.

[0009] In some embodiments, the apparatus includes a processor and a memory storing program instructions, the processor being configured to execute the control method for a heat pump system described above when the program instructions are executed.

[0010] In some embodiments, the heat pump system includes: an air conditioning heat exchanger and a floor heating capillary tube arranged in parallel; a three-way valve disposed at the connection between the inlet side of the air conditioning heat exchanger and the inlet side of the floor heating capillary tube; a control valve disposed at the outlet side of the floor heating capillary tube; and the aforementioned control device for the heat pump system is electrically connected to the three-way valve and the control valve, respectively.

[0011] In some embodiments, the computer-readable storage medium stores program instructions that, when executed, cause a computer to perform the control method for a heat pump system described above.

[0012] The control method, apparatus, heat pump system, and computer-readable storage medium for heat pump systems provided in this disclosure can achieve the following technical effects:

[0013] When a heat pump system starts heating, considering that refrigerant migration usually occurs after the system is in standby mode, it can easily lead to excessive refrigerant circulating in the system. In this embodiment, before the heat pump system operates in heating mode, a three-way valve is pre-controlled to open to the underfloor heating capillary tube, and the control valve on the outlet side of the underfloor heating capillary tube is closed. This allows excess refrigerant to be stored in the underfloor heating capillary tube in advance, ensuring that the amount of refrigerant entering the air conditioning heat exchanger for heating circulation is appropriate. This helps to reasonably increase the compressor's exhaust temperature and ensures the system's energy efficiency, thus better utilizing the heat pump system's heating capacity. After the first storage period, this embodiment can control the three-way valve to immediately open to the air conditioning heat exchanger, allowing the heat pump system to officially start operating in heating mode. Through the powerful heating of the air conditioning heat exchanger, this embodiment can quickly raise the indoor ambient temperature to meet the user's heating needs. Furthermore, as heating demand changes, the refrigerant stored in the underfloor heating capillary tube can be discharged at any time and participate in the system's heating circulation, facilitating timely response to heating demands and better ensuring the user's heating experience.

[0014] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0015] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0016] Figure 1 This is a schematic diagram of the structure of a heat pump system provided in an embodiment of this disclosure;

[0017] Figure 2 This is a schematic diagram of the pipeline connection of a heat pump system operating in heating mode and connected to the underfloor heating capillary tube, provided in an embodiment of this disclosure;

[0018] Figure 3 This is a schematic diagram of the piping connection between a heat pump system operating in heating mode and an air conditioning heat exchanger, provided in an embodiment of this disclosure.

[0019] Figure 4 This is a schematic diagram of a control method for a heat pump system provided in an embodiment of this disclosure;

[0020] Figure 5 This is a schematic diagram of another control method for a heat pump system provided in an embodiment of this disclosure;

[0021] Figure 6 This is a schematic diagram of another control method for a heat pump system provided in an embodiment of this disclosure;

[0022] Figure 7 This is a schematic diagram of another control method for a heat pump system provided in an embodiment of this disclosure;

[0023] Figure 8 This is a schematic diagram of another control method for a heat pump system provided in an embodiment of this disclosure;

[0024] Figure 9 This is a schematic diagram of a control device for a heat pump system provided in an embodiment of this disclosure.

[0025] Figure label:

[0026] 10: Compressor; 20: Outdoor heat exchanger; 30: Air conditioning heat exchanger; 40: Underfloor heating capillary tube; 50: Three-way valve; 60: Control valve; 70: Throttling valve; 80: Four-way valve; 91: First shut-off valve; 92: Second shut-off valve; 100: Outdoor unit; 200: Indoor unit; 300: Control device for heat pump system; 301: Processor; 302: Memory; 303: Communication interface; 304: Bus. Detailed Implementation

[0027] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0028] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0029] Unless otherwise stated, the term "multiple" means two or more.

[0030] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0031] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0032] The term "correspondence" can refer to an association or binding relationship. The correspondence between A and B means that there is an association or binding relationship between A and B.

[0033] In this embodiment of the disclosure, when referring to inlet and outlet pipelines, the terms refer to the state when the heat pump system is in heating mode.

[0034] Combination Figure 1 As shown, this embodiment of the disclosure provides a heat pump system, including: an air conditioning heat exchanger 30, a floor heating capillary tube 40, a three-way valve 50, and a control valve 60. The air conditioning heat exchanger 30 and the floor heating capillary tube 40 are arranged in parallel. The three-way valve 50 is located at the connection between the inlet side of the air conditioning heat exchanger 30 and the inlet side of the floor heating capillary tube 40. The control valve 60 is located at the outlet side of the floor heating capillary tube 40.

[0035] The heat pump system provided in this embodiment can be connected to the air conditioning heat exchanger 30 and / or the underfloor heating capillary tube 40 via a three-way valve 50, thereby reasonably coordinating the heating effects of the air conditioning and underfloor heating components to meet the diverse needs of users at different heating stages and improve the overall heating experience. Furthermore, by installing a control valve 60 on the outlet side of the underfloor heating capillary tube 40, this embodiment can store excess refrigerant in the system within the capillary tube 40, ensuring that the amount of refrigerant entering the air conditioning heat exchanger 30 for heating circulation is appropriate. This helps to reasonably increase the exhaust temperature of the compressor 10 and ensures the system's energy efficiency, thus better utilizing the heating capacity of the heat pump system.

[0036] Furthermore, the heat pump system also includes a compressor 10 and an outdoor heat exchanger 20. The compressor 10 and the outdoor heat exchanger 20 constitute the outdoor unit 100. Correspondingly, the air conditioning heat exchanger 30 and the underfloor heating capillary tube 40 constitute the indoor unit 200. In this way, a refrigerant circulation loop can be formed by the compressor 10, the outdoor heat exchanger 20, the air conditioning heat exchanger 30, and the underfloor heating capillary tube 40, thereby realizing the system's heating operation.

[0037] Optionally, the heat pump system also includes a throttling valve 70. The throttling valve 70 is installed in the inlet pipe of the outdoor heat exchanger 20. In this way, when the heat pump system is operating in heating mode, the evaporation pressure of the outdoor heat exchanger 20 can be adjusted by controlling the opening of the throttling valve 70, so that the refrigerant entering the outdoor heat exchanger 20 evaporates and absorbs heat at the required low pressure, thereby ensuring the heating effect of the heat pump system.

[0038] Optionally, the heat pump system also includes a four-way valve 80. The four-way valve 80 has four ports, which are respectively connected to the exhaust port of the compressor 10, the suction port of the compressor 10, the outdoor heat exchanger 20, the air conditioning heat exchanger 30, and / or the underfloor heating capillary tube 40. In this way, the four-way valve 80 can control the heat pump system to switch between cooling and heating modes to meet the user's actual needs.

[0039] Optionally, the heat pump system further includes a first shut-off valve 91 and a second shut-off valve 92. The first shut-off valve 91 is located in the exhaust pipe of the compressor 10, and the second shut-off valve 92 is located in the inlet pipe of the outdoor heat exchanger 20. In this way, the liquid pipe and gas pipe of the heat pump system can be completely closed or opened by setting the first shut-off valve 91 and the second shut-off valve 92, which helps to ensure the reliable operation of the heat pump system.

[0040] Optionally, both control valve 60 and throttle valve 70 are electronic expansion valves. In this way, by controlling the opening degree of the above-mentioned electronic expansion valves, the refrigerant flow rate on the corresponding pipeline can be controlled to accurately match the heating demand of the heat pump system.

[0041] Optionally, combined Figure 2As shown in the diagram, this embodiment of the present disclosure provides a schematic diagram of the piping connection between a heat pump system operating in heating mode and the underfloor heating capillary tube 40. Specifically, when the three-way valve 50 is connected to the underfloor heating capillary tube 40, the refrigerant discharged from the compressor 10 flows only through the underfloor heating capillary tube 40, thereby enabling the underfloor heating to operate independently. At this time, the heat pump system utilizes all the discharged refrigerant to ensure the heating effect of the underfloor heating capillary tube 30, thereby improving the uniformity of indoor temperature and significantly improving the heating comfort of the heat pump system.

[0042] Optionally, combined Figure 3 As shown in the diagram, this embodiment of the present disclosure provides a schematic diagram of the piping connection between a heat pump system operating in heating mode and an air conditioner heat exchanger. Specifically, when the three-way valve 50 is connected to the air conditioner heat exchanger 30, the refrigerant discharged from the compressor 10 flows only through the air conditioner heat exchanger 30, thereby enabling the air conditioner to operate in heating mode independently. At this time, the heat pump system utilizes all the discharged refrigerant to ensure the heating effect of the air conditioner heat exchanger 20, thereby rapidly increasing the indoor temperature and significantly improving the heating efficiency of the heat pump system.

[0043] Optionally, the heat pump system also includes a control device 300 for the heat pump system. The control device 300 is electrically connected to the three-way valve 50 and the control valve 60, respectively. In this way, the embodiments of the present disclosure can execute corresponding control methods through the control device 300 to better utilize the heating capacity of the heat pump system.

[0044] Based on the above heat pump system, combined with Figure 4 As shown, this disclosure provides a control method for a heat pump system, including:

[0045] S101, when the heat pump system is in heating mode, the control device controls the three-way valve to open to the underfloor heating capillary tube and controls the control valve to close, so as to store part of the refrigerant in the underfloor heating capillary tube.

[0046] S102, after the first storage period, the control device controls the three-way valve to open to the air conditioning heat exchanger so that the heat pump system can operate in heating mode.

[0047] The control method for a heat pump system provided in this disclosure addresses the issue of excessive refrigerant circulating in the system during startup, considering the refrigerant migration that typically occurs after system standby. Before the heat pump system enters heating mode, this disclosure pre-controls a three-way valve to open the underfloor heating capillary tube and closes the control valve at the capillary tube outlet. This allows excess refrigerant to be stored in the capillary tube, ensuring a suitable amount of refrigerant enters the air conditioning heat exchanger for heating, thus facilitating a reasonable increase in compressor exhaust temperature and ensuring system efficiency, thereby better utilizing the heat pump system's heating capacity. After a first storage period, this disclosure controls the three-way valve to immediately open the air conditioning heat exchanger, enabling the heat pump system to officially begin operating in heating mode. Through the powerful heating provided by the air conditioning heat exchanger, this disclosure can quickly raise the indoor ambient temperature to meet the user's heating needs. In addition, as heating demand changes, the refrigerant stored in the underfloor heating capillary tubes can be discharged at any time and participate in the system's heating cycle, which is conducive to responding to heating demand in a timely manner and better ensuring the user's heating experience.

[0048] Optionally, the control device controls the three-way valve to open to the underfloor heating capillary tube and controls the control valve to close, so as to store a portion of the refrigerant in the underfloor heating capillary tube, including: the control device acquiring the continuous standby time of the heat pump system; if the continuous standby time of the heat pump system is longer than the preset standby time, the control device controls the three-way valve to open to the underfloor heating capillary tube and controls the control valve to close, so as to store a portion of the refrigerant in the underfloor heating capillary tube.

[0049] Thus, when the heat pump system starts heating, this embodiment first counts the continuous standby time of the heat pump system to determine whether refrigerant migration has occurred. When the continuous standby time of the heat pump system exceeds the preset standby time, it indicates that after a long period of shutdown, refrigerant migration will occur due to the temperature difference between indoors and outdoors, causing a large amount of refrigerant stored in the underfloor heating capillary tube to migrate to the outdoor side. To avoid excessive refrigerant during the system's heating cycle, this embodiment pre-controls the three-way valve to open to the underfloor heating capillary tube and controls the control valve on the outlet side of the underfloor heating capillary tube to close. This allows excess refrigerant to be stored in the underfloor heating capillary tube in advance, ensuring that the amount of refrigerant entering the air conditioning heat exchanger for heating cycle is appropriate. This is beneficial for reasonably increasing the compressor's exhaust temperature and ensuring the system's operating energy efficiency, thereby better utilizing the heat pump system's heating capacity.

[0050] Optionally, the first storage duration can be set in conjunction with the indoor-outdoor temperature difference to reasonably control the amount of refrigerant stored in the underfloor heating capillary tubes. When the indoor-outdoor temperature difference is greater than the preset temperature difference, a relatively longer first storage duration can be set to store a large amount of refrigerant in the underfloor heating capillary tubes before the heat pump system operates in heating mode; while when the indoor-outdoor temperature difference is less than or equal to the preset temperature difference, a relatively shorter first storage duration can be set to store a small amount of refrigerant in the underfloor heating capillary tubes before the heat pump system operates in heating mode.

[0051] Preferably, the first storage duration can be set to 60 seconds. The first storage duration can also be adjusted according to the user's actual needs, and can be set to any other reasonable value such as 50 seconds or 80 seconds.

[0052] Based on the above heat pump system, combined with Figure 5 As shown, this disclosure provides another control method for a heat pump system, including:

[0053] S201, when the heat pump system is in heating mode, the control device obtains the continuous standby time of the heat pump system.

[0054] S202, when the continuous standby time of the heat pump system exceeds the preset standby time, the control device controls the three-way valve to open to the floor heating capillary tube and controls the control valve to close, so as to store part of the refrigerant in the floor heating capillary tube.

[0055] S203, after the first storage period, the control device controls the three-way valve to open to the air conditioning heat exchanger, so that the heat pump system operates in heating mode. Alternatively,

[0056] S204, when the continuous standby time of the heat pump system is less than or equal to the preset standby time, the control device controls the three-way valve to open to the air conditioning heat exchanger so that the heat pump system can operate in heating mode.

[0057] Using the control method for a heat pump system provided in this disclosure, when the heat pump system starts heating, this disclosure first counts the continuous standby time of the heat pump system to determine whether refrigerant migration has occurred. When the continuous standby time of the heat pump system is longer than the preset standby time, it indicates that after a long period of shutdown, refrigerant migration will occur due to the temperature difference between indoors and outdoors, causing a large amount of refrigerant stored in the underfloor heating capillary to migrate to the outdoor side. To avoid excessive refrigerant during the system's heating cycle, this disclosure pre-controls the three-way valve to open to the underfloor heating capillary and controls the control valve on the outlet side of the underfloor heating capillary to close, thereby storing excess refrigerant in the underfloor heating capillary in advance. This ensures that the amount of refrigerant entering the air conditioning heat exchanger to participate in the heating cycle is appropriate, which is beneficial for reasonably increasing the compressor's exhaust temperature and ensuring the system's operating energy efficiency, thus better utilizing the heating capacity of the heat pump system. When the continuous standby time of the heat pump system is less than or equal to the preset standby time, it indicates that the refrigerant migration phenomenon is not significant after a short system shutdown. At this time, a large amount of refrigerant is still stored in the underfloor heating capillary tubes and will not adversely affect the heating effect of the air conditioner heat exchanger. Therefore, in this embodiment, the three-way valve can be controlled to immediately open to the air conditioner heat exchanger when the system is started, so that the heat pump system can quickly run in heating mode, thereby rapidly increasing the indoor ambient temperature to meet the user's heating needs.

[0058] Optionally, the preset standby time can be set based on the indoor and outdoor temperature difference to reasonably control the pre-storage operation of refrigerant in the underfloor heating capillary before the heat pump system operates in heating mode. When the indoor and outdoor temperature difference is greater than the preset temperature difference, a relatively shorter preset standby time can be set to more easily trigger the pre-storage operation of refrigerant in the underfloor heating capillary; while when the indoor and outdoor temperature difference is less than or equal to the preset temperature difference, a relatively longer preset standby time can be set to more difficult to trigger the pre-storage operation of refrigerant in the underfloor heating capillary.

[0059] Preferably, the preset standby time can be set to 12 hours. The preset standby time can also be adjusted according to the user's actual needs, and can be set to any other reasonable value such as 10 hours or 15 hours.

[0060] Based on the above heat pump system, combined with Figure 6 As shown, this disclosure provides another control method for a heat pump system, including:

[0061] S301, when the heat pump system is in heating mode, the control device controls the three-way valve to open to the underfloor heating capillary tube and controls the control valve to close, so as to store part of the refrigerant in the underfloor heating capillary tube.

[0062] S302, after the first storage period, the control device controls the three-way valve to open to the air conditioning heat exchanger so that the heat pump system can operate in heating mode.

[0063] S303, the control device obtains the coil temperature and outlet temperature of the air conditioning heat exchanger.

[0064] S304, the control device adjusts the state of the three-way valve according to the coil temperature and outlet temperature of the air conditioner heat exchanger.

[0065] The control method for a heat pump system provided in this disclosure allows for pre-controlling the three-way valve to open to the underfloor heating capillary tube before the heat pump system operates in heating mode, and pre-closing the control valve on the outlet side of the underfloor heating capillary tube. This stores some excess refrigerant in the underfloor heating capillary tube in advance, thereby better utilizing the heating capacity of the heat pump system. Subsequently, this disclosure allows for controlling the three-way valve to open to the air conditioning heat exchanger, enabling the heat pump system to officially start operating in heating mode. Once the system is running stably, this disclosure allows for detecting the coil temperature and outlet temperature of the air conditioning heat exchanger to determine the subcooling of the refrigerant at the air conditioning heat exchanger, thereby determining whether the amount of refrigerant currently circulating in the system is appropriate. Based on this, the state of the three-way valve can be adjusted to reasonably regulate the amount of refrigerant circulating in the system, which is beneficial for ensuring the subsequent heating capacity of the heat pump system.

[0066] Optionally, the control device adjusts the state of the three-way valve according to the coil temperature and outlet temperature of the air conditioner heat exchanger, including: when the difference between the coil temperature and the outlet temperature of the air conditioner heat exchanger is less than a preset temperature difference, the control device controls the three-way valve to reconnect to the underfloor heating capillary tube to store some refrigerant in the underfloor heating capillary tube; after a second storage period, the control device controls the three-way valve to reconnect to the air conditioner heat exchanger to enable the heat pump system to operate in heating mode; or, when the difference between the coil temperature and the outlet temperature of the air conditioner heat exchanger is greater than or equal to a preset temperature difference, the control device controls the three-way valve to continue to connect to the air conditioner heat exchanger to enable the heat pump system to operate in heating mode.

[0067] Thus, when the difference between the coil temperature and the outlet temperature of the air conditioner heat exchanger is less than the preset temperature difference, it indicates that the subcooling of the refrigerant at the air conditioner heat exchanger is relatively small. At this time, due to flashover, some gaseous refrigerant may flow directly into the outdoor heat exchanger, thereby affecting the heating effect of the system. Therefore, this embodiment can control the three-way valve to reconnect to the underfloor heating capillary tube to store the current excess refrigerant in the underfloor heating capillary tube, thereby ensuring the subsequent heating capacity of the heat pump system and improving the heating effect of the heat pump system. When the difference between the coil temperature and the outlet temperature of the air conditioner heat exchanger is greater than or equal to the preset temperature difference, it indicates that the subcooling of the refrigerant at the air conditioner heat exchanger is reasonable, and the amount of refrigerant currently participating in the circulation in the system is appropriate. Therefore, this embodiment can control the three-way valve to continue to connect to the air conditioner heat exchanger to maintain the heat pump system in the current optimal heating mode, which is beneficial to ensuring the user's comfort experience.

[0068] Optionally, the second storage duration can be set according to the system's operating conditions. Preferably, the second storage duration can be set to 30 seconds. The second storage duration can also be adjusted according to the user's actual needs, and can be set to any other reasonable value such as 25 seconds or 35 seconds.

[0069] Based on the above heat pump system, combined with Figure 7 As shown, this disclosure provides another control method for a heat pump system, including:

[0070] S401, when the heat pump system is in heating mode, the control device controls the three-way valve to open to the underfloor heating capillary tube and controls the control valve to close, so as to store part of the refrigerant in the underfloor heating capillary tube.

[0071] S402, after the first storage period, the control device controls the three-way valve to open to the air conditioning heat exchanger so that the heat pump system can operate in heating mode.

[0072] S403, the control device obtains the coil temperature and outlet temperature of the air conditioning heat exchanger.

[0073] S404, when the difference between the coil temperature and the outlet temperature of the air conditioner heat exchanger is less than the preset temperature difference, the control device controls the three-way valve to reconnect to the underfloor heating capillary tube so as to store some refrigerant in the underfloor heating capillary tube.

[0074] S405, after the second storage period, the control device controls the three-way valve to reopen to the air conditioning heat exchanger, so that the heat pump system operates in heating mode. Alternatively,

[0075] S406, when the difference between the coil temperature and the outlet temperature of the air conditioner heat exchanger is greater than or equal to the preset temperature difference, the control device controls the three-way valve to continue to open to the air conditioner heat exchanger so that the heat pump system can operate in heating mode.

[0076] Using the control method for a heat pump system provided in this disclosure, when the difference between the coil temperature and the outlet temperature of the air conditioner heat exchanger is less than a preset temperature difference, it indicates that the subcooling of the refrigerant at the air conditioner heat exchanger is relatively small. In this case, flashover may cause some gaseous refrigerant to flow directly into the outdoor heat exchanger, thus affecting the system's heating effect. Therefore, this disclosure embodiment can control the three-way valve to reconnect to the underfloor heating capillary tube to store the currently excess refrigerant in the underfloor heating capillary tube, thereby ensuring the subsequent heating capacity of the heat pump system and improving its heating effect. Conversely, when the difference between the coil temperature and the outlet temperature of the air conditioner heat exchanger is greater than or equal to the preset temperature difference, it indicates that the subcooling of the refrigerant at the air conditioner heat exchanger is reasonable, and the amount of refrigerant currently circulating in the system is appropriate. Therefore, this disclosure embodiment can control the three-way valve to continue connecting to the air conditioner heat exchanger to maintain the heat pump system in its optimal heating mode, which is beneficial for ensuring a comfortable user experience.

[0077] Optionally, the control device controls the three-way valve to reconnect to the underfloor heating capillary tube to store a portion of the refrigerant in the capillary tube. This includes: the control device determining the target opening degree of the three-way valve to the underfloor heating capillary tube based on the difference between the coil temperature and the outlet temperature of the air conditioning heat exchanger; and the control device controlling the three-way valve to connect to the underfloor heating capillary tube according to the target opening degree to store a portion of the refrigerant in the capillary tube. The target opening degree of the three-way valve to the underfloor heating capillary tube is negatively correlated with the difference between the coil temperature and the outlet temperature of the air conditioning heat exchanger.

[0078] Thus, when the three-way valve is reconnected to the underfloor heating capillary, this embodiment can analyze the current excess refrigerant in the system by combining the difference between the coil temperature and the outlet temperature of the air conditioning heat exchanger, and accordingly match the target opening degree of the three-way valve to the underfloor heating capillary. By controlling the three-way valve to connect to the underfloor heating capillary according to the target opening degree, this embodiment can reasonably control the amount of refrigerant stored in the underfloor heating capillary, so that the amount of refrigerant entering the air conditioning heat exchanger to participate in the heating cycle is more appropriate, thereby helping to ensure the subsequent heating capacity of the heat pump system.

[0079] For example, the control device determines the target opening degree of the three-way valve to the underfloor heating capillary tube based on the difference between the coil temperature and the outlet temperature of the air conditioner heat exchanger. This includes: when the difference between the coil temperature and the outlet temperature of the air conditioner heat exchanger is less than a preset temperature difference but greater than or equal to a first temperature difference, the control device determines the target opening degree of the three-way valve to the underfloor heating capillary tube as a first target opening degree; or, when the difference between the coil temperature and the outlet temperature of the air conditioner heat exchanger is less than the first temperature difference but greater than or equal to a second temperature difference, the control device determines the target opening degree of the three-way valve to the underfloor heating capillary tube as a second target opening degree; or, when the difference between the coil temperature and the outlet temperature of the air conditioner heat exchanger is less than the second temperature difference, the control device determines the target opening degree of the three-way valve to the underfloor heating capillary tube as a third target opening degree. Wherein, the first target opening degree is less than the second target opening degree, and the second target opening degree is less than the third target opening degree.

[0080] Specifically, the preset temperature difference is 1.5℃, the first temperature difference is 1℃, and the second temperature difference is 0.5℃. The preset temperature difference, the first temperature difference, and the second temperature difference can also be adjusted according to the user's actual needs.

[0081] Correspondingly, the first target opening is 1 / 5 of the maximum opening of the three-way valve to the underfloor heating capillary tube, the second target opening is 1 / 3 of the maximum opening of the three-way valve to the underfloor heating capillary tube, and the third target opening is 1 / 2 of the maximum opening of the three-way valve to the underfloor heating capillary tube. The first, second, and third target openings can also be adjusted according to the user's actual needs.

[0082] Based on the above heat pump system, combined with Figure 8 As shown, this disclosure provides another control method for a heat pump system, including:

[0083] S501, when the heat pump system is in heating mode, the control device controls the three-way valve to open to the underfloor heating capillary tube and controls the control valve to close, so as to store part of the refrigerant in the underfloor heating capillary tube.

[0084] S502, after the first storage period, the control device controls the three-way valve to open to the air conditioning heat exchanger so that the heat pump system can operate in heating mode.

[0085] S503: When the heat pump system stops heating, the control device controls the control valve to close.

[0086] The control method for a heat pump system provided in this disclosure addresses the issue of refrigerant migration after system standby, which could lead to excessive refrigerant circulation upon system restart and consequently affect the heating performance of the air conditioner heat exchanger. This method involves closing a control valve to prevent large-scale refrigerant migration from the underfloor heating capillary tubes to the outdoor side, thus ensuring the subsequent heating capacity of the heat pump system.

[0087] Combination Figure 9 As shown, this embodiment of the disclosure provides a control device 300 for a heat pump system, including a processor 301 and a memory 302. Optionally, the control device 300 may further include a communication interface 303 and a bus 304. The processor 301, communication interface 303, and memory 302 can communicate with each other via the bus 304. The communication interface 303 can be used for information transmission. The processor 301 can call logical instructions in the memory 302 to execute the control method for the heat pump system described in the above embodiment.

[0088] Furthermore, the logic instructions in the aforementioned memory 302 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium.

[0089] The memory 302, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as program instructions / modules corresponding to the methods in the embodiments of this disclosure. The processor 301 executes functional applications and data processing by running the program instructions / modules stored in the memory 302, thereby implementing the control method for the heat pump system in the above embodiments.

[0090] The memory 302 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the terminal device. Furthermore, the memory 302 may include high-speed random access memory and may also include non-volatile memory.

[0091] This disclosure provides a computer-readable storage medium storing computer-executable instructions configured to perform the control method for a heat pump system described above.

[0092] The technical solutions of this disclosure can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes one or more 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 method described in this disclosure. The aforementioned storage medium can be a non-transitory storage medium, such as a USB flash drive, external hard drive, read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk, etc., and other media capable of storing program code.

[0093] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, procedural, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for describing embodiments only and is not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to equally include the plural forms unless the context clearly indicates otherwise. Similarly, the term “and / or” as used in this application means including one or more of the associated listed items and all possible combinations thereof. Additionally, when used in this application, the term "comprise" and its variations "comprises" and / or "comprising" refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Without further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element. In this document, each embodiment may focus on the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, the relevant parts can be referred to the description of the method section.

[0094] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this disclosure. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0095] The methods and products (including but not limited to devices and equipment) disclosed in the embodiments herein can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of units may be merely a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the shown or discussed units may be through some interfaces, and the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms. The units described as separate components may or may not be physically separate. 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 units may be selected to implement this embodiment according to actual needs. Furthermore, the functional units in the embodiments of this disclosure may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0096] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than that shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. Each block in a block diagram and / or flowchart, and combinations of blocks in a block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

Claims

1. A control method for a heat pump system, characterized in that, The heat pump system includes an air conditioning heat exchanger and a floor heating capillary tube connected in parallel. A three-way valve is provided at the connection between the inlet side of the air conditioning heat exchanger and the inlet side of the floor heating capillary tube, and a control valve is provided at the outlet side of the floor heating capillary tube; the control method includes: When the heat pump system starts heating, the three-way valve is opened to the underfloor heating capillary tube, and the control valve is closed to store some refrigerant in the underfloor heating capillary tube. After the first storage period, the three-way valve is switched on to the air conditioning heat exchanger so that the heat pump system can operate in heating mode.

2. The control method according to claim 1, characterized in that, The three-way valve is controlled to open to the underfloor heating capillary tube, and the control valve is controlled to close, so that a portion of the refrigerant is stored in the underfloor heating capillary tube, including: Obtain the continuous standby time of the heat pump system; If the continuous standby time of the heat pump system exceeds the preset standby time, the three-way valve is opened to the underfloor heating capillary tube, and the control valve is closed to store some refrigerant in the underfloor heating capillary tube.

3. The control method according to claim 2, characterized in that, Also includes: When the continuous standby time of the heat pump system is less than or equal to the preset standby time, the three-way valve is controlled to open to the air conditioning heat exchanger so that the heat pump system can operate in heating mode.

4. The control method according to claim 1, characterized in that, After controlling the three-way valve to open to the air conditioning heat exchanger to enable the heat pump system to operate in heating mode, the following steps are also included: Obtain the coil temperature and outlet temperature of the air conditioner heat exchanger; Adjust the state of the three-way valve according to the coil temperature and outlet temperature of the air conditioner heat exchanger.

5. The control method according to claim 4, characterized in that, Adjust the state of the three-way valve according to the coil temperature and outlet temperature of the air conditioner heat exchanger, including: If the difference between the coil temperature and the outlet temperature of the air conditioner heat exchanger is less than the preset temperature difference, the three-way valve is controlled to reconnect to the underfloor heating capillary tube so that some refrigerant is stored in the underfloor heating capillary tube. After the second storage period, the three-way valve is reopened to the air conditioning heat exchanger to allow the heat pump system to operate in heating mode; or... If the difference between the coil temperature and the outlet temperature of the air conditioner heat exchanger is greater than or equal to the preset temperature difference, the three-way valve is controlled to continue to open to the air conditioner heat exchanger so that the heat pump system can operate in heating mode.

6. The control method according to claim 5, characterized in that, Controlling the three-way valve to reconnect to the underfloor heating capillary tube to store some refrigerant in the capillary tube includes: Based on the difference between the coil temperature and the outlet temperature of the air conditioner heat exchanger, determine the target opening degree of the three-way valve to the underfloor heating capillary tube. The three-way valve is controlled to open to the underfloor heating capillary tube according to the target opening degree, so as to store part of the refrigerant in the underfloor heating capillary tube; Among them, the target opening degree of the three-way valve to the underfloor heating capillary tube is negatively correlated with the difference between the coil temperature and the outlet temperature of the air conditioning heat exchanger.

7. The control method according to any one of claims 1 to 6, characterized in that, Also includes: When the heat pump system stops heating, the control valve closes.

8. A control device for a heat pump system, comprising a processor and a memory storing program instructions, characterized in that, The processor is configured to execute, when running the program instructions, the control method for a heat pump system as described in any one of claims 1 to 7.

9. A heat pump system, characterized in that, include: Air conditioning heat exchangers and underfloor heating capillary tubes are connected in parallel; A three-way valve is installed at the connection between the inlet side of the air conditioner heat exchanger and the inlet side of the underfloor heating capillary tube. The control valve is located on the outlet side of the underfloor heating capillary tube; The control device for a heat pump system as described in claim 8 is electrically connected to a three-way valve and a control valve, respectively.

10. A computer-readable storage medium storing program instructions, characterized in that, When the program instructions are executed, they cause the computer to perform the control method for a heat pump system as described in any one of claims 1 to 7.

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