Compressor unit, heating and ventilation device and control method, controller and heating and ventilation system

Abstract

The application discloses a compressor unit, a heating and ventilation device and a control method, a controller and a heating and ventilation system. The compressor unit comprises a compressor, a four-way valve and a pressure relief module; the four-way valve comprises an input port, a backflow port, a first port and a second port; the input port is communicated with a discharge port of the compressor, and the backflow port is communicated with a suction port of the compressor; an economizer and a first throttle valve are arranged on a pipeline between a first heat exchange unit and a second heat exchange unit, the economizer is communicated with the suction port of the compressor; one end of the pressure relief module is communicated with the suction port of the compressor, and the other end of the pressure relief module is communicated with the discharge port of the compressor; the pressure relief module is used for connecting the suction port and the discharge port of the compressor based on the fact that the heating and ventilation device meets a preset pressure relief condition. The embodiment of the application can solve the technical problem that the multi-split air conditioning system is prone to lack of refrigerant and lack of cooling oil in the related art, and the heat exchange effect of the system is reduced, thereby causing poor user experience.

Description

Technical Field

[0001] This application relates to the field of heating, ventilation and air conditioning (HVAC) technology, specifically to a compressor unit, HVAC device and its control method, controller and HVAC system. Background Technology

[0002] In traditional multi-split HVAC systems, the outdoor unit is placed on the roof or equipment floor. However, when installation space is limited, the outdoor unit cannot be installed. To solve this technical problem, a split multi-split HVAC system is adopted, which separates the outdoor unit into a heat exchanger unit and a compressor unit. The compressor unit is placed on the indoor side, and the heat exchanger module is suspended in the ceiling or integrated into the building.

[0003] However, in split-type multi-split HVAC systems, because multiple compressor units are connected in parallel, when some compressor units are not working for a long time, the pipelines of the non-working compressor units will remain under high pressure. This will cause the refrigerant and cooling oil to condense continuously in the pipelines of the non-working compressor units, which will further lead to a shortage of refrigerant and cooling oil in the entire HVAC system, resulting in a decrease in the system's heat exchange efficiency and a poor user experience. Summary of the Invention

[0004] In view of the above problems, this application provides a compressor unit, a heating and ventilation device and its control method, a controller and a heating and ventilation system, so as to at least solve the technical problems in the related art where multi-split heating and ventilation systems are prone to refrigerant and cooling oil shortages, resulting in a decrease in the system's heat exchange effect and a poor user experience.

[0005] According to a first aspect of the present application, a compressor unit is provided, the compressor unit being applied to a heating, ventilation and air conditioning (HVAC) system, the compressor unit comprising: a compressor, a four-way valve, and a pressure relief module; the four-way valve comprising an input port, a return port, a first port, and a second port; wherein a first heat exchange unit connected to the outside and the compressor are independently configured.

[0006] The input port is connected to the exhaust port of the compressor, the return port is connected to the intake port of the compressor, the first port is used to connect to the first heat exchange unit, and the second port is used to connect to the second heat exchange unit connected to the room.

[0007] One end of the pressure relief module is connected to the air intake of the compressor, and the other end of the pressure relief module is connected to the air exhaust of the compressor; the pressure relief module is used to connect the air intake and air exhaust of the compressor based on the HVAC device meeting the preset pressure relief conditions.

[0008] In some embodiments of this application, the pressure relief module includes a capillary tube and a solenoid valve. The first end of the capillary tube is connected to the first end of the solenoid valve, the second end of the solenoid valve is connected to the intake port of the compressor, and the second end of the capillary tube is connected to the exhaust port of the compressor.

[0009] In some embodiments of this application, the pressure relief module includes a second throttle valve, the first end of which is connected to the intake port of the compressor, and the second end of which is connected to the exhaust port of the compressor.

[0010] In some embodiments of this application, a temperature monitoring module and a pressure monitoring module are provided at the air intake of the compressor and the input port of the four-way valve.

[0011] In some embodiments of this application, the temperature monitoring module includes a first temperature sensor and a second temperature sensor, and the pressure monitoring module includes a first pressure sensor and a second pressure sensor.

[0012] The first temperature sensor is installed on the return pipe of the compressor and is used to monitor the temperature of the heat exchange medium entering the compressor inlet.

[0013] The second temperature sensor is installed on the exhaust pipe of the compressor to monitor the temperature of the heat exchange medium entering the four-way valve;

[0014] The first pressure sensor is installed on the return pipe of the compressor and is used to monitor the pressure of the heat exchange medium entering the compressor suction port;

[0015] The second pressure sensor is installed on the exhaust pipe of the compressor and is used to monitor the pressure of the heat exchange medium entering the four-way valve.

[0016] In some embodiments of this application, the compressor unit is disposed in the first housing of the HVAC system, which is located outdoors or indoors.

[0017] According to a second aspect of the embodiments of this application, a compressor unit is provided, the HVAC system comprising: at least two compressor units as described in the above embodiments, at least one first heat exchange unit, and at least one second heat exchange unit communicating with the room;

[0018] The first heat exchange unit is connected to the compressor unit via a first air pipe assembly;

[0019] The second heat exchange unit is connected to the compressor unit via a second gas pipe assembly;

[0020] The first heat exchange unit and the second heat exchange unit are connected by a liquid pipe assembly.

[0021] According to a third aspect of the embodiments of this application, a control method for a heating, ventilation, and air conditioning (HVAC) device is also provided. The method includes: determining that the HVAC device meets a preset pressure relief condition, and controlling the pressure relief module to open so that the suction port of a compressor that is not operating normally is connected to the exhaust port of the compressor; wherein the pressure relief condition is used to indicate that there is at least one compressor unit that is not operating in the HVAC device, and / or that the HVAC device lacks heat exchange medium.

[0022] In some embodiments of this application, if it is determined that the HVAC device does not meet the preset pressure relief condition, the pressure relief module is controlled to shut down.

[0023] In some embodiments of this application, determining that the HVAC system meets preset pressure relief conditions includes:

[0024] Based on the presence of at least one non-operating compressor unit in the HVAC system, the downtime duration of the non-operating compressor unit is obtained;

[0025] Based on the fact that the stop operating time is greater than or equal to a first preset time, it is determined that the HVAC system meets the preset pressure relief condition; wherein, the first preset time is determined based on the ambient temperature, the piping length of the HVAC system, and the amount of cooling medium condensation corresponding to the number of non-operating compressor units.

[0026] In some embodiments of this application, the condition based on the HVAC device satisfying the preset pressure relief condition includes:

[0027] Based on the fact that at least one compressor unit in the HVAC system is not in operation and the amount of cooling medium in the HVAC system has not reached the preset amount, it is determined that the HVAC system meets the preset pressure relief condition.

[0028] In some embodiments of this application, determining that the amount of cooling medium in the HVAC system has not reached a preset amount includes:

[0029] Determine the exhaust superheat and return superheat of each compressor unit operating normally in the HVAC system;

[0030] Based on the fact that the exhaust superheat of any of the compressor units is greater than or equal to a first preset value, or based on the fact that the return superheat of any of the compressor units is greater than or equal to a second preset value, it is determined that the amount of cooling medium in the HVAC system has not reached the preset amount.

[0031] In some embodiments of this application, determining the exhaust superheat of each compressor unit operating normally in the HVAC system includes:

[0032] Obtain the saturation temperature corresponding to the current discharge pressure of a normally operating compressor unit;

[0033] Obtain a first difference between the current exhaust temperature of the normally operating compressor unit and the saturation temperature, and determine the first difference as the exhaust superheat.

[0034] In some embodiments of this application, determining the return superheat of each compressor unit operating normally in the HVAC system includes:

[0035] Obtain the saturation temperature corresponding to the current return gas pressure of a normally operating compressor unit;

[0036] Obtain a second difference between the current return gas temperature and the saturation temperature of the normally operating compressor unit, and determine the second difference as the return gas superheat.

[0037] In some embodiments of this application, controlling the pressure relief module to open includes:

[0038] The pressure relief module is controlled to open for a second preset duration, which is determined by reducing the condensation of the cooling medium corresponding to the HVAC device to a preset threshold within the first preset duration.

[0039] In some embodiments of this application, the control method further includes:

[0040] The operating state of the target heat exchange unit of the HVAC system is determined, and the heat exchange performance parameters corresponding to the target heat exchange unit in the operating state are obtained; the target heat exchange unit is any one of the first heat exchange units, and the heat exchange performance parameters are used to characterize the heat exchange efficiency corresponding to the target heat exchange unit.

[0041] Based on the heat exchange performance parameters and the target heat exchange performance parameters, adjust the opening degree of the expansion valve of the target heat exchange unit.

[0042] In some embodiments of this application, the heat exchange performance parameters include the outlet liquid accumulation coefficient, which is used to characterize the amount of heat exchange medium inside the first heat exchange subunit;

[0043] The process of determining the operating state of the target heat exchange unit of the HVAC system, obtaining the heat exchange performance parameters corresponding to the target heat exchange unit in the operating state, and adjusting the opening degree of the expansion valve of the target heat exchange unit according to the heat exchange performance parameters and the target heat exchange performance parameters includes:

[0044] Determine that the target heat exchange unit of the HVAC system has stopped operating, and obtain the outlet liquid accumulation coefficient corresponding to the target heat exchange unit;

[0045] The opening degree of the expansion valve of the target heat exchange unit is adjusted according to the outlet liquid accumulation coefficient and the target liquid accumulation coefficient.

[0046] In some embodiments of this application, adjusting the opening degree of the expansion valve of the target heat exchange unit based on the outlet liquid accumulation coefficient and the target liquid accumulation coefficient includes:

[0047] If the outlet liquid accumulation coefficient is determined to be greater than the target liquid accumulation coefficient, the opening degree of the expansion valve of the target heat exchange unit is increased.

[0048] If the outlet liquid accumulation coefficient is determined to be less than the target liquid accumulation coefficient, the opening degree of the expansion valve of the target heat exchange unit is reduced.

[0049] The outlet liquid accumulation coefficient is determined to be equal to the target liquid accumulation coefficient, and the opening degree of the expansion valve of the target heat exchange unit is controlled to remain unchanged.

[0050] According to a fourth aspect of the embodiments of this application, a control device for a heating, ventilation, and air conditioning (HVAC) system is provided, comprising: a control unit, configured to determine that the HVAC system meets preset pressure relief conditions, and control the pressure relief module to open so that the intake port of a compressor that is not operating normally is connected to the exhaust port of the compressor.

[0051] According to a fifth aspect of the embodiments of this application, a controller is also provided, which includes a control device for the HVAC system described in the fourth aspect.

[0052] According to a sixth aspect of the embodiments of this application, a heating, ventilation, and air conditioning system is also provided, including the heating, ventilation, and air conditioning device involved in the second aspect and the controller involved in the fifth aspect.

[0053] According to a seventh aspect of the embodiments of this application, a computer-readable storage medium is also provided, wherein a computer program is stored in the computer program, and the computer program is configured to execute the control method of the HVAC device described in the first aspect when it is run.

[0054] In this embodiment, by using a pressure relief module installed between the compressor and the exhaust and intake ports, high-pressure refrigerant in the pipeline of the non-operating compressor unit can flow into the main refrigerant line when the HVAC system is short of refrigerant and the compressor stops running. This not only ensures the heat exchange effect of the HVAC system when the compressor unit fails, reduces the occurrence of refrigerant and cooling oil shortages in the HVAC system, and improves the heat exchange effect of the system, but also ensures the comfort and reliability of the HVAC system, significantly improving the user experience. Attached Figure Description

[0055] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0056] Figure 1 This is a structural schematic diagram of a heating, ventilation, and air conditioning (HVAC) device based on related technologies;

[0057] Figure 2 This is a schematic diagram of another optional HVAC device according to an embodiment of this application;

[0058] Figure 3 This is a schematic diagram of another optional HVAC device according to an embodiment of this application;

[0059] Figure 4 This is a schematic diagram of another optional HVAC device according to an embodiment of this application;

[0060] Figure 5 This is a schematic diagram of another optional HVAC device according to an embodiment of this application;

[0061] Figure 6 This is a schematic diagram of the structure of a compressor unit of an optional HVAC system according to an embodiment of this application;

[0062] Figure 7 This is a schematic diagram of the structure of a compressor unit of another optional HVAC system according to an embodiment of this application;

[0063] Figure 8 This is a schematic diagram of another optional HVAC device according to an embodiment of this application;

[0064] Figure 9 This is a schematic diagram of another optional HVAC device according to an embodiment of this application;

[0065] Figure 10 This is a schematic diagram of the structure of a compressor unit of another optional HVAC system according to an embodiment of this application;

[0066] Figure 11 This is a schematic flowchart of an optional control method for a heating, ventilation, and air conditioning (HVAC) device according to an embodiment of this application.

[0067] Figure 12 This is a schematic diagram of another optional HVAC device according to an embodiment of this application;

[0068] Figure 13 This is a schematic diagram of another optional HVAC device according to an embodiment of this application;

[0069] Figure 14 This is a flowchart illustrating another optional control method for a heating, ventilation, and air conditioning (HVAC) device according to an embodiment of this application.

[0070] Figure 15 This is a schematic diagram of the structure of a control device for a heating, ventilation, and air conditioning system provided in an embodiment of this application;

[0071] Figure 16 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application.

[0072] In the above figure:

[0073] 1. Compressor unit; 2. First heat exchange unit; 3. Second heat exchange unit; 4. First gas pipe assembly; 5. Second gas pipe assembly; 6. Liquid pipe assembly;

[0074] 11. Compressor; 12. Four-way valve; 13. First throttle valve; 14. Economizer; 15. Pressure relief module; 151. Solenoid valve; 152. Capillary tube; 161. First temperature sensor; 162. Second temperature sensor; 171. First pressure sensor; 172. Second pressure sensor;

[0075] 21, Heat exchanger; 22, First expansion valve;

[0076] A, the inlet port of the four-way valve; B, the return port of the four-way valve; C, the first port of the four-way valve; D, the second port of the four-way valve. Detailed Implementation

[0077] To enable those skilled in the art to better understand the present invention, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0078] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention 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 so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0079] Figure 1 This is a schematic diagram of a heating, ventilation, and air conditioning (HVAC) device according to an exemplary embodiment of this application. The HVAC device includes a compressor unit 1, a first heat exchange unit 2, and a second heat exchange unit 3. The first heat exchange unit 2 is connected to the compressor unit 1 via a first gas pipe assembly 4, and the second heat exchange unit 3 is connected to the compressor unit 1 via a second gas pipe assembly 5. The first heat exchange unit 2 and the second heat exchange unit 3 are connected via a liquid pipe assembly 6.

[0080] The first heat exchange unit 2 is connected to the outside (i.e., placed on the outdoor side) and is used for heat exchange with the outdoor side. The second heat exchange unit 3 is connected to the indoor side (i.e., placed on the indoor side) and is used for cooling or heating the indoor side. The compressor unit 1 is used to provide the circulating flow of the heat exchange medium for the HVAC system. Since the first heat exchange unit 2 and the compressor unit 1 are separate, the compressor unit 1 can be placed either on the indoor side or the outdoor side, depending on the size of the installation environment, which allows for flexibility and overcomes installation limitations.

[0081] Based on the above-mentioned HVAC system structure, such as Figure 2 As shown, Figure 2The arrows indicate the flow direction of the heat exchange medium in the HVAC system during cooling mode. When the HVAC system needs to operate in cooling mode, the input port A of the four-way valve 12 is connected to the first port C of the four-way valve 12, and the second port D of the four-way valve 12 is connected to the return port B of the four-way valve 12. This allows the compressor 11 to compress the low-temperature, low-pressure gaseous heat exchange medium into a high-temperature, high-pressure gaseous heat exchange medium, which is then output through the input port A and the first port C of the four-way valve 12 to the first gas pipe group 4. The first gas pipe group 4 then transmits the high-temperature, high-pressure gaseous heat exchange medium to the first heat exchange unit 2. In heat exchange unit 2, the gaseous heat exchange medium is condensed into a high-temperature, high-pressure liquid heat exchange medium, which is then transferred to the economizer 14 via the liquid pipe assembly 6. The first throttle valve 13 throttles and reduces the pressure of the liquid heat exchange medium flowing through the economizer 14, causing a portion of the liquid heat exchange medium in the economizer 14 to evaporate and absorb heat, becoming a gaseous heat exchange medium. This evaporation and heat absorption subcools the remaining liquid heat exchange medium, which is then transferred to the second heat exchange unit 3 via the liquid pipe assembly 6. Meanwhile, the gaseous heat exchange medium formed by evaporation in the economizer 14 is drawn into the compressor 11 through the pipe between the economizer 14 and the suction port of the compressor 11. The liquid heat exchange medium is transferred to the second heat exchange unit 3. In the second heat exchange unit 3, the liquid heat exchange medium is evaporated and absorbs heat to form a low-temperature and low-pressure gaseous heat exchange medium, which realizes indoor cooling. Then, the low-temperature and low-pressure gaseous heat exchange medium is transferred to the compressor 11 through the second gas pipe group 5 and the second port D and return port B of the four-way valve 12. This cycle is repeated to realize the cooling operation of the HVAC system.

[0082] like Figure 3 As shown, Figure 3 The arrows indicate the flow direction of the heat exchange medium in the HVAC system during heating mode. (Reference) Figure 4When the HVAC system needs to operate in heating mode, the input port A of the four-way valve 12 is connected to the second port D of the four-way valve 12, and the first port C of the four-way valve 12 is connected to the return port B of the four-way valve 12. This allows the compressor 11 to compress the low-temperature, low-pressure gaseous heat exchange medium into a high-temperature, high-pressure gaseous heat exchange medium, which is then output through the input port A and the second port D of the four-way valve 12 to the second gas pipe group 5. The second gas pipe group 5 then transmits the high-temperature, high-pressure gaseous heat exchange medium to the second heat exchange unit. 3. In the second heat exchange unit 3, the gaseous heat exchange medium condenses into a liquid heat exchange medium to achieve indoor heating. It is then transmitted to the economizer 14 via the liquid pipe assembly 6. The first throttle valve 13 throttles and reduces the pressure of the liquid heat exchange medium flowing through the economizer 14, causing a portion of the liquid heat exchange medium to evaporate and absorb heat, becoming a gaseous heat exchange medium. This evaporation and heat absorption subcools the remaining liquid heat exchange medium. The subcooled liquid heat exchange medium is then transmitted to the first heat exchange unit 2 via the liquid pipe assembly 6. Meanwhile, the gaseous heat exchange medium formed by evaporation in the economizer 14 is drawn into the compressor 11 through the pipe between the economizer 14 and the suction port of the compressor 11. The liquid heat exchange medium is transferred to the first heat exchange unit 2. In the first heat exchange unit 2, the liquid heat exchange medium evaporates and absorbs heat to form a low-temperature and low-pressure gaseous heat exchange medium. Then, the low-temperature and low-pressure gaseous heat exchange medium is transferred to the compressor 11 through the first gas pipe group 4 and the first port C and return port B of the four-way valve 12. This cycle is repeated to realize the heating operation of the HVAC system.

[0083] In a split-type multi-split HVAC system, multiple compressor units are connected in parallel, such as Figure 3 and Figure 4 As shown, when some compressor units malfunction or remain inactive for an extended period, the piping of the inactive compressor units, such as... Figure 4 The piping between points P1 and P2 in medium cooling mode, or as follows: Figure 5 In medium heating mode, the pipes between points P5 and P6 will remain under high pressure. This will cause the refrigerant and cooling oil in the HVAC system to condense continuously in the pipes of the compressor unit that is not in operation. This will further lead to a shortage of refrigerant and cooling oil in the entire HVAC system, resulting in a decrease in the system's heat exchange efficiency and a poor user experience.

[0084] Based on this, this application provides a compressor unit, a heating and ventilation system including the compressor, and a control method thereof. By using a pressure relief module installed between the compressor and the exhaust and intake ports, when the compressor stops running and the heating and ventilation system is short of refrigerant, the high-pressure refrigerant in the pipeline of the non-working compressor unit can flow into the main refrigerant pipeline. This not only ensures the heat exchange effect of the heating and ventilation system when the compressor unit fails, but also releases pressure in a timely manner when the pressure in the pipeline of the heating and ventilation system is too high, protecting the system from damage and avoiding equipment damage or safety accidents caused by excessive pressure, thereby improving the reliability and safety of the system.

[0085] The following detailed description, in conjunction with the accompanying drawings, describes a heating and ventilation device and its control method, controller, and heating and ventilation system provided in the embodiments of this application.

[0086] See Figure 6 The diagram illustrates the structure of a compressor unit used in a heating, ventilation, and air conditioning (HVAC) system. The compressor unit 1 includes a compressor 11, a four-way valve 12, and a pressure relief module 15. The four-way valve includes an input port A, a return port B, a first port C, and a second port D. The first heat exchange unit 2, which communicates with the outdoor unit, and the compressor 11 are independently configured. The compressor unit 1 and the first heat exchange unit 2 are independently configured, meaning their mechanical installation is independent. In other words, unlike traditional multi-split HVAC systems that integrate the compressor and outdoor unit into a single housing, in this embodiment, the compressor unit 1 and the first heat exchange unit 2 are separated and no longer housed in the same housing. This allows the compressor unit 1 and the first heat exchange unit 2 to be installed in different physical locations or spaces. For example, the compressor unit 1 can be installed indoors, while the first heat exchange unit 2 can be installed in the ceiling or in the outdoor space.

[0087] Combination Figure 1 and Figure 6 As shown, the input port A is connected to the exhaust port of the compressor 11, the return port B is connected to the intake port of the compressor 11, the first port C is used to connect to the first heat exchange unit 2 connected to the outside, and the second port D is used to connect to the second heat exchange unit 3 connected to the inside.

[0088] In one example, the compressor unit 1 further includes an economizer 14 and a first throttle valve 13, wherein the economizer 14 and the first throttle valve 13 are disposed on the pipeline between the first heat exchange unit 2 and the second heat exchange unit 3, and the economizer 14 is connected to the suction port of the compressor 11.

[0089] One end of the pressure relief module 15 is connected to the air intake of the compressor 11, and the other end of the pressure relief module 15 is connected to the exhaust port of the compressor 11. The pressure relief module 15 is used to connect the air intake and exhaust port of the compressor 11 based on the HVAC device meeting the preset pressure relief conditions.

[0090] In cooling mode, the pressure relief module 15, located between the compressor and the exhaust and intake ports, allows the non-operating compressor unit to be opened when the compressor unit is stopped. This connects the intake and exhaust ports of the compressor 11 in the compressor unit. The high-temperature, high-pressure gaseous refrigerant discharged from the normally operating compressor enters point P2 through the installation piping from point P1. The high-temperature, high-pressure gaseous refrigerant condenses in the piping. The liquid and gaseous mixture then passes through the four-way valve 12 of the stopped compressor unit, then through the pressure relief module 15 to point P4. From there, it passes through the four-way valve 12 of the non-operating compressor 11 and reaches point P5 of the installation piping, where it merges with the refrigerant returning from the inside. Finally, it enters the normally operating compressor unit through the connected installation piping, completing the entire cycle. This prevents the refrigerant and cooling oil from continuously condensing between the P1 and P2 pipes.

[0091] In heating mode, the pressure relief module 12 of the non-operating compressor unit is turned on, connecting the suction port and discharge port of the compressor 11 in the compressor unit. The high-temperature and high-pressure heat exchange medium in the pipeline between P5 and P6 passes through the four-way valve 12 from point P5, then through the pressure relief module 12 and then through the four-way valve back to the main pipeline of the heat exchange medium, where it merges with the heat exchange medium of the normally operating compressor unit, and then enters the normally operating compressor unit through the connected installation piping to complete the entire cycle. In this way, the heat exchange medium such as refrigerant and cooling oil will not continuously condense between the pipelines of P5 and P6.

[0092] In the cooling or heating mode of this application embodiment, when the HVAC system is short of refrigerant, the high-pressure refrigerant in the pipeline of the non-working compressor unit flows into the main refrigerant pipeline. This not only ensures the heat exchange effect of the HVAC system when the compressor unit fails, but also releases pressure in time when the pressure in the HVAC system pipeline is too high, protecting the system from damage and avoiding equipment damage or safety accidents caused by excessive pressure, thereby improving the reliability and safety of the system.

[0093] In one or more embodiments, see Figure 7 The diagram shows a structural schematic of a compressor unit. The pressure relief module 15 includes a capillary tube 152 and a solenoid valve 151. The first end of the capillary tube 152 is connected to the first end of the solenoid valve 151. The second end of the solenoid valve 151 is connected to the intake port of the compressor 11. The second end of the capillary tube 152 is connected to the exhaust port of the compressor 11.

[0094] Specifically, in the embodiments of this application, such as Figure 8 As shown, in cooling mode, through the capillary tube 152 and solenoid valve 151 installed between the compressor and the exhaust port and suction port, the solenoid valve 151 of the non-operating compressor unit can be opened when the compressor unit stops running, connecting the suction port and exhaust port of the compressor 11 in the compressor unit. The high-temperature and high-pressure gaseous refrigerant discharged by the normally operating compressor enters point P2 through the installation piping from point P1. The high-temperature and high-pressure gaseous refrigerant condenses in the piping. The liquid and gaseous mixture then passes through the four-way valve 12 of the non-operating compressor unit, and then through the capillary tube 152 and solenoid valve 151 to reach point P4. From there, it passes through the return pipe of the non-operating compressor 11 through the four-way valve 12 to reach point P5 of the installation piping, where it merges with the refrigerant returning from the inside. Then, it enters the normally operating compressor unit through the connected installation piping, completing the entire cycle. In this way, the heat exchange medium such as refrigerant and cooling oil will not continuously condense between the P1-P2 piping.

[0095] like Figure 9 As shown, in heating mode, the solenoid valve 151 of the non-operating compressor unit is opened, connecting the suction port and discharge port of the compressor 11 in the compressor unit. The high-temperature and high-pressure heat exchange medium in the pipeline between P5 and P6 passes through the four-way valve 12 from point P5, then through the capillary tube 152 and the solenoid valve 151, and then through the four-way valve back to the main pipeline of the heat exchange medium, where it merges with the heat exchange medium of the normally operating compressor unit. Then, it enters the normally operating compressor unit through the connected installation piping, completing the entire cycle. In this way, the heat exchange medium such as refrigerant and cooling oil will not continuously condense between the pipelines of P5 and P6.

[0096] In one or more embodiments, the pressure relief module includes a second throttle valve, a first end of which is connected to the intake port of the compressor, and a second end of which is connected to the exhaust port of the compressor.

[0097] In the cooling or heating mode of this application embodiment, when the HVAC system is short of refrigerant, the high-pressure refrigerant in the pipeline of the non-working compressor unit flows into the main refrigerant through the second throttle valve. This not only ensures the heat exchange effect of the HVAC system when the compressor unit fails, reduces the occurrence of refrigerant and cooling oil shortages in the HVAC system, and improves the heat exchange effect of the system, but also ensures the comfort and reliability of the HVAC system, significantly improving the user experience.

[0098] In one or more embodiments, a temperature monitoring module and a pressure monitoring module are provided at the air intake of the compressor and the input port of the four-way valve.

[0099] By installing temperature monitoring modules and pressure monitoring modules at the compressor's suction port and the input port of the four-way valve, it is possible to accurately calculate whether there is a lack of heat exchange medium in the current system, and further adjust the heat exchange medium in the HVAC system to improve the system's heat exchange effect.

[0100] In one or more embodiments, such as Figure 10 As shown, the temperature monitoring module includes a first temperature sensor 161 and a second temperature sensor 162, and the pressure monitoring module includes a first pressure sensor 171 and a second pressure sensor 172.

[0101] The first temperature sensor 161 is disposed on the return pipe of the compressor 11 and is used to monitor the temperature of the heat exchange medium entering the inlet of the compressor 11; the second temperature sensor 162 is disposed on the exhaust pipe of the compressor 11 and is used to monitor the temperature of the heat exchange medium entering the four-way valve 12.

[0102] The first pressure sensor 171 is disposed on the return pipe of the compressor 11 and is used to monitor the pressure of the heat exchange medium entering the suction port of the compressor 11; the second pressure sensor 172 is disposed on the discharge pipe of the compressor 11 and is used to monitor the pressure of the heat exchange medium entering the four-way valve 12. The first pressure sensor 171 can be a low-pressure sensor, and the second pressure sensor 172 can be a high-pressure sensor.

[0103] In one or more embodiments, the compressor unit is disposed in a first housing of the HVAC system, the first housing being disposed outdoors or indoors.

[0104] In some embodiments of this application, the HVAC system further includes a first housing and at least one second housing separate from the first housing. A compressor unit 1 is disposed in the first housing, and at least one first heat exchange unit 2 is disposed in each of the second housings.

[0105] Since the first heat exchange unit 2 and the compressor unit 1 are separate, the compressor unit 1 is installed in the first housing (not shown in the figure), and the first heat exchange unit 2 is installed in the second housing (not shown in the figure) which is separate from the first housing. The second housing is installed on the outdoor side, while the first housing can be installed on the outdoor side or the indoor side.

[0106] In some embodiments, the HVAC system may include two or more second housings, each of which may house one or more first heat exchange units 2. The second housings may be located in different installation environments.

[0107] In this embodiment, by placing the compressor unit 1 and the first heat exchange unit 2 in two separate housings and using mounting fittings (i.e., the first air pipe group 4) to connect the compressor unit 1 and the first heat exchange unit 2, the wind resistance caused by the single housing design can be reduced, the air circulation efficiency can be improved, and the separate first housing and second housing can be installed separately according to the size of the installation environment space, providing more installation options and flexibility.

[0108] By setting the second housing in different installation environments, different first heat exchange units 2 can be installed in different installation environments, thereby enabling independent control of the operation of each first heat exchange unit 2 based on the external environment. This helps to optimize the overall operating efficiency and indoor comfort, and effectively reduces the impact of the external environment on the overall system performance of the HVAC system.

[0109] Combination Figure 1 as well as Figure 7 and 8 As shown, this application also provides a heating, ventilation, and air conditioning (HVAC) device, which includes at least one compressor unit 1 as described in the above embodiments, as well as at least one first heat exchange unit 2 and at least one second heat exchange unit 3. The first heat exchange unit 2 is connected to the compressor unit 1 via a first gas pipe assembly 4, the second heat exchange unit 3 is connected to the compressor unit 1 via a second gas pipe assembly 5, and the first heat exchange unit 2 and the second heat exchange unit 3 are connected via a liquid pipe assembly 6.

[0110] As an alternative implementation method, such as Figure 11 As shown in the figure, this application provides a control method for a heating, ventilation, and air conditioning (HVAC) system, including the following steps:

[0111] S1102, determine that the HVAC system meets the preset pressure relief condition, and control the pressure relief module to open so that the suction port of the compressor that is not operating normally is connected to the exhaust port of the compressor; wherein, the pressure relief condition is used to indicate that there is at least one compressor unit that is not operating in the HVAC system.

[0112] Specifically, in this embodiment, the aforementioned pressure relief condition can be, for example, the presence of a non-operating compressor and / or a lack of heat exchange medium in the system. In cooling or heating mode, when a lack of heat exchange medium is detected in the HVAC system, the pressure relief module is activated, connecting the compressor's suction port to its discharge port. This allows the high-pressure refrigerant in the non-operating compressor unit's piping to flow into the main refrigerant line. This not only ensures the heat exchange effect of the HVAC system when the compressor unit malfunctions, but also promptly releases pressure when the HVAC system's piping becomes excessively pressurized, protecting the system from damage and preventing equipment damage or safety accidents caused by excessive pressure, thus improving the system's reliability and safety.

[0113] As an optional implementation, the control method further includes: determining that the HVAC device does not meet the preset pressure relief condition, and controlling the pressure relief module to shut down.

[0114] In one or more embodiments, determining that the HVAC system meets preset pressure relief conditions includes:

[0115] Based on the presence of at least one non-operating compressor unit in the HVAC system, the downtime duration of the non-operating compressor unit is obtained;

[0116] Based on the fact that the stop operating time is greater than or equal to a first preset time, it is determined that the HVAC system meets the preset pressure relief condition; wherein, the first preset time is determined based on the ambient temperature, the piping length of the HVAC system, and the amount of cooling medium condensation corresponding to the number of non-operating compressor units.

[0117] Specifically, in this embodiment, the first preset duration can be determined based on the amount of cooling medium condensation generated by the system when only one compressor unit in the HVAC system is operating normally, and the indoor and outdoor ambient temperatures reach a preset minimum value and the piping length of the HVAC system reaches a preset maximum length. When there are one or more non-operating compressor units in the HVAC system, and the shutdown time of the non-operating compressor units reaches the aforementioned first preset duration, the current HVAC system will experience a lack of heat exchange medium. At this time, it is determined that the HVAC system meets the preset pressure relief condition, and the pressure relief module is controlled to open. In one example, the value range of the aforementioned first preset duration can be [1, 2] hours.

[0118] In one or more embodiments, the condition based on the HVAC system satisfying the preset pressure relief condition includes:

[0119] Based on the fact that at least one compressor unit in the HVAC system is not in operation and the amount of cooling medium in the HVAC system has not reached the preset amount, it is determined that the HVAC system meets the preset pressure relief condition.

[0120] Specifically, in this embodiment, the preset medium quantity is the lower limit of the preset medium quantity for normal operation of the HVAC system. When there is at least one non-operating compressor unit in the HVAC system, and the detected cooling medium quantity of the HVAC system does not reach the preset medium quantity, the current HVAC system lacks heat exchange medium. It is determined that the HVAC system meets the preset pressure relief condition, and the pressure relief module is controlled to open.

[0121] In one or more embodiments, determining that the amount of cooling medium in the HVAC system has not reached a preset amount includes:

[0122] Determine the exhaust superheat and return superheat of each compressor unit operating normally in the HVAC system;

[0123] Based on the fact that the exhaust superheat of any of the compressor units is greater than or equal to a first preset value, or based on the fact that the return superheat of any of the compressor units is greater than or equal to a second preset value, it is determined that the amount of cooling medium in the HVAC system has not reached the preset amount.

[0124] In HVAC systems, monitoring the exhaust superheat and return superheat of compressor units is crucial for ensuring normal system operation and compressor protection. Exhaust superheat refers to the temperature difference between the compressor exhaust pipe temperature and the saturation temperature corresponding to the actual condensing pressure, while return superheat refers to the condition where the compressor suction temperature is higher than the evaporation temperature. If the exhaust superheat of any compressor unit is greater than or equal to a first preset value, or the return superheat of any compressor unit is greater than or equal to a second preset value, it indicates that the amount of cooling medium has not reached the preset level.

[0125] In one or more embodiments, determining the exhaust superheat of each compressor unit operating normally in the HVAC system includes:

[0126] Obtain the saturation temperature corresponding to the current discharge pressure of a normally operating compressor unit;

[0127] Obtain a first difference between the current exhaust temperature of the normally operating compressor unit and the saturation temperature, and determine the first difference as the exhaust superheat.

[0128] Specifically, in the embodiments of this application, combined with Figure 10 As shown, the current discharge pressure of the normally operating compressor unit is obtained based on the second pressure sensor 172; then, the saturation temperature T1 of the heat exchange medium at that pressure is looked up from a table based on the current discharge pressure and the discharge pressure. This saturation temperature refers to the temperature point at which the refrigerant changes from a gaseous state to a liquid state at the discharge pressure. Next, the discharge temperature T2 of the compressor unit is directly measured using the second temperature sensor 162. The first difference δ1 = T2 - T1 between the current discharge temperature of the normally operating compressor unit and the saturation temperature is obtained, and the first difference δ1 is determined as the discharge superheat.

[0129] In one or more embodiments, determining the return superheat of each compressor unit operating normally in the HVAC system includes:

[0130] Obtain the saturation temperature corresponding to the current return gas pressure of a normally operating compressor unit;

[0131] Obtain a second difference between the current return gas temperature and the saturation temperature of the normally operating compressor unit, and determine the second difference as the return gas superheat.

[0132] Specifically, in the embodiments of this application, combined with Figure 10 As shown, the current return gas pressure of the normally operating compressor unit is obtained based on the first pressure sensor 171; then, the saturation temperature T3 of the heat exchange medium at that pressure is looked up from a table based on the current return gas pressure and the return gas pressure. Next, the return gas temperature T4 of the compressor unit is directly measured using the first temperature sensor 161. The first difference δ2 = T4 - T3 between the current return gas temperature of the normally operating compressor unit and the saturation temperature is obtained, and the first difference δ1 is determined as the exhaust superheat.

[0133] In one or more embodiments, controlling the pressure relief module to open includes:

[0134] The pressure relief module is controlled to open for a second preset duration, which is determined by reducing the condensation of the cooling medium corresponding to the HVAC device to a preset threshold within the first preset duration.

[0135] Specifically, in this embodiment, the value range of the second preset duration can be [1, 3] minutes. The second preset duration is determined based on the amount of cooling medium condensation generated by the system when only one compressor unit in the HVAC system is operating normally, and the indoor and outdoor ambient temperatures reach a preset minimum value and the piping length of the HVAC system reaches a preset maximum length. This duration is calculated by reducing the amount of cooling medium condensation to a preset threshold.

[0136] like Figure 12 The HVAC system shown includes multiple first heat exchange units 2, which are connected in parallel; as shown Figure 13 As shown, when heat exchanger module 3 is in a non-working state for a long time, the piping of the heat exchanger module will remain under high pressure; from Figure 13 As can be seen, the connecting pipes, heat exchangers, and electronic expansion valves between points P7 and P8 may be in a state where the refrigerant is not flowing. In the cooling mode of the HVAC system, the pipes between points P7 and P8 are under high pressure. Since the saturation temperature corresponding to high pressure is higher than the ambient temperature, the refrigerant will continuously condense into a liquid state and remain in the pipes and inside the heat exchanger between points P7 and P8. In cooling mode, the refrigerant flowing to the heat exchanger module after being compressed by the compressor is in a high-temperature and high-pressure state. The cooling oil in the compressor will change from a liquid state to a gaseous state and mix into the refrigerant. This will cause the refrigerant and cooling oil to continuously condense in the pipes of the non-working heat exchanger module, further leading to a shortage of refrigerant and cooling oil in the entire HVAC system, a decrease in the system's heat exchange efficiency, and a poor user experience.

[0137] To address the aforementioned technical problems, as an optional implementation method, this application provides a control method for a heating, ventilation, and air conditioning (HVAC) system, comprising:

[0138] S1, determine the operating state of the target heat exchange unit of the HVAC system, and obtain the heat exchange performance parameters corresponding to the target heat exchange unit in the operating state; the target heat exchange unit is any one of the first heat exchange units connected to the outside, and the heat exchange performance parameters are used to characterize the heat exchange efficiency corresponding to the target heat exchange unit.

[0139] Specifically, the HVAC system in this application embodiment can be a split-split multi-unit air conditioner, or a split-split multi-unit central air conditioner, etc., and the implementing entity of this application can be a controller for the HVAC system or an electronic device for controlling the various components within the HVAC system. In one example, such as Figure 12 The HVAC device shown includes three first heat exchange units 2. By detecting whether the heat exchanger modules 1 to 3 are in working or not working, the heat exchange performance parameters corresponding to the three first heat exchange units 2 in their respective operating states are obtained. The heat exchange performance parameters in this application may include outlet liquid accumulation coefficient or outlet subcooling, heat exchange efficiency or overall heat transfer coefficient, etc.

[0140] In one example, when two of the first heat exchange units are detected to be in operation, the outlet subcooling of the two first heat exchange units needs to be obtained; when a third first heat exchange unit is detected to be in a non-operational state, the outlet liquid accumulation coefficient of the third first heat exchange unit needs to be obtained.

[0141] S2, adjust the opening degree of the expansion valve of the target heat exchange unit according to the heat exchange performance parameters and the target heat exchange performance parameters.

[0142] Specifically, in the embodiments of this application, the aforementioned target heat transfer performance parameters are heat transfer performance parameters set according to the system requirements and optimal operating conditions; when the heat transfer performance parameter is the outlet liquid accumulation coefficient of the heat exchanger module, the target heat transfer performance parameter is the target outlet liquid accumulation coefficient; when the heat transfer performance parameter is the outlet subcooling of the heat exchanger module, the target heat transfer performance parameter is the target outlet subcooling. In one example, combined with... Figure 13 As shown, for example, when it is detected that two of the first heat exchange units are in working condition, it is necessary to obtain the outlet subcooling of the two first heat exchange units, and adjust the opening degree of the first expansion valve 22 of each of the two first heat exchange units according to the outlet subcooling of each of the two first heat exchange units and the target outlet subcooling.

[0143] When the third heat exchange unit is detected to be in an inactive state, the outlet liquid accumulation coefficient of the heat exchanger 21 of the third heat exchange unit needs to be obtained. Based on the outlet liquid accumulation coefficient of the heat exchanger 21 of the third heat exchange unit and the target outlet liquid accumulation coefficient, the opening degree of the first expansion valve 22 of the third heat exchange unit is adjusted.

[0144] In this embodiment, by determining the operating state of the target heat exchange unit of the HVAC system, the heat exchange performance parameters corresponding to the target heat exchange unit in the operating state are obtained; the target heat exchange unit is any one of the first heat exchange units connected to the outside, and the heat exchange performance parameters are used to characterize the heat exchange efficiency corresponding to the target heat exchange unit; the method of adjusting the opening degree of the expansion valve of the target heat exchange unit according to the heat exchange performance parameters and the target heat exchange performance parameters allows for accurate monitoring and evaluation of the heat exchange performance of the heat exchanger module, and dynamic adjustment based on real-time data. By optimizing the opening degree of the expansion valve, the occurrence of refrigerant shortage and cooling oil shortage in the HVAC system is reduced, improving the heat exchange effect of the system, while also ensuring the comfort and reliability of the HVAC system, significantly improving the user experience.

[0145] In one or more embodiments, the heat exchange performance parameter includes an outlet liquid accumulation coefficient, which is used to characterize the amount of heat exchange medium inside the first heat exchange subunit.

[0146] The process of determining the operating state of the target heat exchange unit of the HVAC system, obtaining the heat exchange performance parameters corresponding to the target heat exchange unit in the operating state, and adjusting the opening degree of the expansion valve of the target heat exchange unit according to the heat exchange performance parameters and the target heat exchange performance parameters includes:

[0147] Determine that the target heat exchange unit of the HVAC system has stopped operating, and obtain the outlet liquid accumulation coefficient corresponding to the target heat exchange unit;

[0148] The opening degree of the expansion valve of the target heat exchange unit is adjusted according to the outlet liquid accumulation coefficient and the target liquid accumulation coefficient.

[0149] Specifically, in the embodiments of this application, the heat exchange medium is a different type of refrigerant, or a mixture of refrigerant and cooling oil. In one example, for instance, when any of the first heat exchange units is detected to be in a stopped operating state, such as... Figure 13 As shown, the pipes and modules between points P7 and P8 may be in a state where the refrigerant does not flow. In the cooling mode of the HVAC system, the pipes between points P7 and P8 are in a high-pressure state. Since the saturation temperature corresponding to the high pressure is greater than the ambient temperature, the refrigerant will continue to condense into a liquid state and exist in the pipes between points P7 and P8 and inside the currently non-working heat exchanger 21.

[0150] After determining that the current operating status of the first heat exchange unit is stopped, the controller needs to obtain the current outlet liquid accumulation coefficient of heat exchanger 21 in the first heat exchange unit. The outlet liquid accumulation coefficient can be seen as the amount of refrigerant inside heat exchanger 21. This coefficient reflects the proportion of liquid refrigerant at the outlet of heat exchanger 21 and is an important indicator for evaluating the heat exchanger's heat exchange performance. Then, the controller sets a target outlet liquid accumulation coefficient based on the system's optimal operating conditions and performance requirements. The controller compares the actual outlet liquid accumulation coefficient with the target liquid accumulation coefficient, and calculates the opening degree of the first expansion valve 22 that needs adjustment based on the difference between these two values. Adjusting the opening degree of expansion valve 22 can change the refrigerant flow rate entering the current first heat exchange unit, thereby precisely adjusting the refrigerant flow rate through the current first heat exchange unit. Based on the above technical means, the performance of the heat exchanger module can be effectively controlled and optimized. By precisely controlling the refrigerant flow rate and distribution, the heat exchange efficiency of the heat exchanger unit can be improved, energy consumption reduced, and the heat exchange performance of the HVAC system enhanced.

[0151] In one or more embodiments, adjusting the opening degree of the expansion valve of the target heat exchange unit based on the outlet liquid accumulation coefficient and the target liquid accumulation coefficient includes:

[0152] If the outlet liquid accumulation coefficient is determined to be greater than the target liquid accumulation coefficient, the opening degree of the expansion valve of the target heat exchange unit is increased.

[0153] If the outlet liquid accumulation coefficient is determined to be less than the target liquid accumulation coefficient, the opening degree of the expansion valve of the target heat exchange unit is reduced.

[0154] The outlet liquid accumulation coefficient is determined to be equal to the target liquid accumulation coefficient, and the opening degree of the expansion valve of the target heat exchange unit is controlled to remain unchanged.

[0155] Specifically, in the embodiments of this application, combined with Figure 5 As shown, taking the currently stopped first heat exchange unit as an example, the controller obtains the current outlet liquid accumulation coefficient of heat exchanger 21 in the current first heat exchange unit. If the outlet liquid accumulation coefficient is greater than the target liquid accumulation coefficient, it indicates that there is too much liquid refrigerant inside heat exchanger 21, which may lead to a decrease in heat exchange efficiency. In order to reduce refrigerant liquid accumulation, the controller increases the opening degree of the first expansion valve 22 in the current first heat exchange unit, thereby increasing the refrigerant flow rate and reducing the refrigerant liquid accumulation in heat exchanger 21 in the current first heat exchange unit.

[0156] If the outlet liquid accumulation coefficient is less than the target liquid accumulation coefficient, it indicates that the amount of liquid refrigerant inside heat exchanger 21 is insufficient, which may lead to insufficient heat exchange efficiency. In order to increase the amount of refrigerant in heat exchanger 21 in the current first heat exchange unit, the controller reduces the opening of the first expansion valve 22 in the current first heat exchange unit, thereby reducing the refrigerant flow rate and increasing the amount of refrigerant in heat exchanger 21 in the current first heat exchange unit.

[0157] If the outlet liquid accumulation coefficient equals the target liquid accumulation coefficient, it means that the current operating state of the first heat exchange unit has reached its optimal level, and the controller will maintain the current opening degree of the first expansion valve 1012 unchanged.

[0158] Based on the above embodiments, in one application embodiment, such as Figure 14 As shown, the control method for this HVAC system also includes the following steps:

[0159] Step S1. Obtain the operating status of the compressor unit.

[0160] Step S2. Based on the operating status, determine whether there is an unoperated compressor unit. If there is, proceed to step S4; otherwise, proceed to step S3.

[0161] Step S3. Continue using the conventional control logic of the HVAC system.

[0162] Step S4. Determine whether the downtime of the non-operating compressor unit is greater than or equal to A1. If yes, proceed to step S5; otherwise, proceed to step S6. The value of A1 ranges from 1 to 2 hours.

[0163] Step S5. Control the solenoid valve of the pressure relief module to open for B1 minutes, and then close it. The value of A1 ranges from 1 to 2 minutes.

[0164] Step S6. Determine if the current system is short of refrigerant. If yes, proceed to step S5; otherwise, proceed to step S3.

[0165] According to another aspect of the embodiments of this application, a control device for a heating, ventilation, and air conditioning (HVAC) system for implementing the above-described garment handling equipment control method is also provided, such as... Figure 15 As shown, the device includes:

[0166] Control unit 1502 is used to determine that the HVAC device meets the preset pressure relief conditions and control the pressure relief module to open so that the suction port of the compressor that is not operating normally is connected to the exhaust port of the compressor.

[0167] In this embodiment, by using a pressure relief module installed between the compressor and the exhaust and intake ports, high-pressure refrigerant in the pipeline of the non-operating compressor unit can flow into the main refrigerant line when the HVAC system is short of refrigerant and the compressor stops running. This not only ensures the heat exchange effect of the HVAC system when the compressor unit fails, reduces the occurrence of refrigerant and cooling oil shortages in the HVAC system, and improves the heat exchange effect of the system, but also ensures the comfort and reliability of the HVAC system, significantly improving the user experience.

[0168] According to another aspect of the embodiments of this application, a controller is also provided, which includes the control device for the HVAC system described in the fourth aspect above.

[0169] According to another aspect of the embodiments of this application, a heating, ventilation and air conditioning system is also provided, including the heating, ventilation and air conditioning device and controller in the above embodiments.

[0170] According to another aspect of the embodiments of this application, an electronic device for implementing the control method of the above-described HVAC device is also provided. This electronic device may be a controller or a controller with a control client for the HVAC device installed. This embodiment uses a controller as an example. Optionally, in this embodiment, the controller can access a computer network via a wired or wireless network to communicate with the HVAC device, receive control commands from a terminal device, and execute corresponding operations according to the control commands.

[0171] Optionally, the aforementioned electronic devices may also include, but are not limited to, mobile phones, laptops, tablets, PDAs, MIDs (Mobile Internet Devices), desktop computers, smart TVs, etc. The control client for the HVAC device in this application embodiment includes, but is not limited to, clients providing garment handling equipment control services for video clients, instant messaging clients, browser clients, educational clients, etc. The aforementioned networks may include, but are not limited to, wired networks and wireless networks. The wired network includes local area networks (LANs), metropolitan area networks (MANs), and wide area networks (WANs). The wireless network includes Bluetooth, Wi-Fi, and other networks that enable wireless communication.

[0172] like Figure 16 As shown, the controller includes a memory 1602 and a processor 1604. The memory 1602 stores a computer program, and the processor 1604 is configured to execute the steps of any of the above method embodiments via the computer program.

[0173] Optionally, in this embodiment, the processor can be configured to perform the following steps via a computer program:

[0174] S1, determine that the HVAC device meets the preset pressure relief conditions, and control the pressure relief module to open so that the suction port of the compressor that is not operating normally is connected to the exhaust port of the compressor.

[0175] Alternatively, as those skilled in the art will understand, Figure 16 The structure shown is for illustrative purposes only. Figure 16 This does not limit the structure of the aforementioned electronic devices. For example, the electronic device may also include components that are more... Figure 16 The more or fewer components shown (such as network interfaces, etc.), or having the same Figure 16 The different configurations shown.

[0176] The memory 1602 can be used to store software programs and modules, such as the program instructions / modules corresponding to the HVAC control method and control device in this embodiment. The processor 1604 executes various functional applications and data processing by running the software programs and modules stored in the memory 1602, thereby realizing the aforementioned HVAC control method. The memory 1602 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 1602 may further include memory remotely located relative to the processor 1604, and these remote memories can be connected to terminal devices via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof. Specifically, the memory 1602 may be used, but is not limited to, to store clothing handling programs and control instructions for cleaning operations. As an example, such as... Figure 16 As shown, the memory 1602 may include, but is not limited to, the control unit 1502 in the control device of the HVAC system. Furthermore, it may include, but is not limited to, other module units in the control device of the HVAC system, which will not be described further in this example.

[0177] Optionally, the transmission device 1606 described above is used to receive or send data via a network. Specific examples of the network described above may include wired networks and wireless networks. In one example, the transmission device 1606 includes a Network Interface Controller (NIC), which can be connected to other network devices and a router via a network cable to communicate with the Internet or a local area network. In another example, the transmission device 1606 is a Radio Frequency (RF) module, used for wireless communication with the Internet.

[0178] In addition, the controller also includes: a display 1608 for displaying the operating status of the HVAC system; and a connection bus 1610 for connecting the various module components in the electronic device.

[0179] In one or more embodiments, this application also provides a computer program product or computer program including computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the computer device to perform the above-described live animal detection method for clothing processing equipment. The computer program is configured to execute the steps of any of the above-described method embodiments when running.

[0180] Optionally, in this embodiment, the computer-readable storage medium described above may be configured to store a computer program for performing the following steps:

[0181] S1, determine that the HVAC system meets the preset pressure relief conditions, and control the pressure relief module to open so that the suction port of the compressor that is not operating normally is connected to the exhaust port of the compressor; wherein, the pressure relief conditions are used to indicate that there is at least one compressor unit that is not operating in the HVAC system, and / or the HVAC system lacks heat exchange medium.

[0182] Optionally, in this embodiment, those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be implemented by a program instructing the hardware related to the terminal device. The program can be stored in a computer-readable storage medium, which may include: flash drive, read-only memory (ROM), random access memory (RAM), disk or optical disk, etc.

[0183] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0184] If the integrated units in the above embodiments are implemented as software functional units and sold or used as independent products, they can be stored in the aforementioned 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 all or 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 one or more computer devices (which may be personal computers, servers, or network devices, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention.

[0185] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0186] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0187] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A compressor unit, said compressor unit being used in a heating, ventilation, and air conditioning (HVAC) system, characterized in that, The HVAC system includes at least two compressor units connected in parallel via piping. Each compressor unit includes a compressor, a four-way valve, and a pressure relief module. The four-way valve includes an input port, a return port, a first port, and a second port. The first heat exchange unit connected to the outside and the compressor are independently configured. The input port is connected to the exhaust port of the compressor, the return port is connected to the intake port of the compressor, the first port is used to connect to the first heat exchange unit, and the second port is used to connect to the second heat exchange unit connected to the room. One end of the pressure relief module is connected to the air intake of the compressor, and the other end of the pressure relief module is connected to the air exhaust of the compressor; the pressure relief module is used to connect the air intake and air exhaust of the compressor based on the HVAC device meeting the preset pressure relief conditions.

2. The compressor unit according to claim 1, characterized in that, The pressure relief module includes a capillary tube and a solenoid valve. The first end of the capillary tube is connected to the first end of the solenoid valve, the second end of the solenoid valve is connected to the intake port of the compressor, and the second end of the capillary tube is connected to the exhaust port of the compressor.

3. The compressor unit according to claim 1, characterized in that, The pressure relief module includes a second throttle valve, the first end of which is connected to the intake port of the compressor, and the second end of which is connected to the exhaust port of the compressor.

4. The compressor unit according to any one of claims 1 to 3, characterized in that, Temperature monitoring modules and pressure monitoring modules are installed at the air intake of the compressor and the input port of the four-way valve.

5. The compressor unit according to claim 4, characterized in that, The temperature monitoring module includes a first temperature sensor and a second temperature sensor, and the pressure monitoring module includes a first pressure sensor and a second pressure sensor. The first temperature sensor is installed on the return pipe of the compressor and is used to monitor the temperature of the heat exchange medium entering the compressor inlet. The second temperature sensor is installed on the exhaust pipe of the compressor to monitor the temperature of the heat exchange medium entering the four-way valve; The first pressure sensor is installed on the return pipe of the compressor and is used to monitor the pressure of the heat exchange medium entering the compressor suction port; The second pressure sensor is installed on the exhaust pipe of the compressor and is used to monitor the pressure of the heat exchange medium entering the four-way valve.

6. The compressor unit according to any one of claims 1-3, characterized in that, The compressor unit is disposed in the first housing of the HVAC system, which is located outdoors or indoors.

7. A heating, ventilation, and air conditioning (HVAC) device, characterized in that, The HVAC system includes: at least two compressor units as described in any one of claims 1-6, at least one first heat exchange unit, and at least one second heat exchange unit connected to the room; The first heat exchange unit is connected to the compressor unit via a first air pipe assembly; The second heat exchange unit is connected to the compressor unit via a second gas pipe assembly; The first heat exchange unit and the second heat exchange unit are connected by a liquid pipe assembly.

8. A control method for the HVAC system according to claim 7, characterized in that, The method includes: The system determines that the HVAC system meets the preset pressure relief conditions, and controls the pressure relief module to open so that the suction port of the compressor that is not operating normally is connected to the exhaust port of the compressor; wherein, the pressure relief conditions are used to indicate that there is at least one compressor unit that is not operating in the HVAC system, and / or the HVAC system lacks heat exchange medium.

9. The control method according to claim 8, characterized in that, The control method further includes: If it is determined that the HVAC system does not meet the preset pressure relief condition, the pressure relief module is controlled to shut down.

10. The control method according to claim 8 or 9, characterized in that, The step of determining that the HVAC system meets the preset pressure relief conditions includes: Based on the presence of at least one non-operating compressor unit in the HVAC system, the downtime duration of the non-operating compressor unit is obtained; Based on the fact that the stop operating time is greater than or equal to a first preset time, it is determined that the HVAC system meets the preset pressure relief condition; wherein, the first preset time is determined based on the ambient temperature, the piping length of the HVAC system, and the amount of cooling medium condensation corresponding to the number of non-operating compressor units.

11. The control method according to claim 8 or 9, characterized in that, The condition based on the HVAC system meeting the preset pressure relief condition includes: Based on the fact that at least one compressor unit in the HVAC system is not in operation and the amount of cooling medium in the HVAC system has not reached the preset amount, it is determined that the HVAC system meets the preset pressure relief condition.

12. The control method according to claim 11, characterized in that, The determination that the amount of cooling medium in the HVAC system has not reached the preset amount includes: Determine the exhaust superheat and return superheat of each compressor unit operating normally in the HVAC system; Based on the fact that the exhaust superheat of any of the compressor units is greater than or equal to a first preset value, or based on the fact that the return superheat of any of the compressor units is greater than or equal to a second preset value, it is determined that the amount of cooling medium in the HVAC system has not reached the preset amount.

13. The control method according to claim 12, characterized in that, Determining the exhaust superheat of each compressor unit operating normally in the HVAC system includes: Obtain the saturation temperature corresponding to the current discharge pressure of a normally operating compressor unit; Obtain a first difference between the current exhaust temperature of the normally operating compressor unit and the saturation temperature, and determine the first difference as the exhaust superheat.

14. The control method according to claim 12, characterized in that, Determining the return gas superheat of each compressor unit operating normally in the HVAC system includes: Obtain the saturation temperature corresponding to the current return gas pressure of a normally operating compressor unit; Obtain a second difference between the current return gas temperature and the saturation temperature of the normally operating compressor unit, and determine the second difference as the return gas superheat.

15. The control method according to claim 8 or 9, characterized in that, The control of opening the pressure relief module includes: The pressure relief module is controlled to open for a second preset duration, which is determined by reducing the condensation of the cooling medium corresponding to the HVAC device to a preset threshold within the first preset duration.

16. The control method according to claim 8, characterized in that, The method further includes: The operating state of the target heat exchange unit of the HVAC system is determined, and the heat exchange performance parameters corresponding to the target heat exchange unit in the operating state are obtained; the target heat exchange unit is any one of the first heat exchange units, and the heat exchange performance parameters are used to characterize the heat exchange efficiency corresponding to the target heat exchange unit. Based on the heat exchange performance parameters and the target heat exchange performance parameters, adjust the opening degree of the expansion valve of the target heat exchange unit.

17. The control method according to claim 16, characterized in that, The heat exchange performance parameters include the outlet liquid accumulation coefficient, which is used to characterize the amount of heat exchange medium inside the first heat exchange subunit. The process involves determining the operating status of the target heat exchange unit of the HVAC system and obtaining the heat exchange performance parameters corresponding to the target heat exchange unit under the operating status. Adjusting the opening degree of the expansion valve of the target heat exchange unit based on the heat exchange performance parameters and the target heat exchange performance parameters includes: Determine that the target heat exchange unit of the HVAC system has stopped operating, and obtain the outlet liquid accumulation coefficient corresponding to the target heat exchange unit; The opening degree of the expansion valve of the target heat exchange unit is adjusted according to the outlet liquid accumulation coefficient and the target liquid accumulation coefficient.

18. The control method according to claim 17, characterized in that, The step of adjusting the opening degree of the expansion valve of the target heat exchange unit according to the outlet liquid accumulation coefficient and the target liquid accumulation coefficient includes: If the outlet liquid accumulation coefficient is determined to be greater than the target liquid accumulation coefficient, the opening degree of the expansion valve of the target heat exchange unit is increased. If the outlet liquid accumulation coefficient is determined to be less than the target liquid accumulation coefficient, the opening degree of the expansion valve of the target heat exchange unit is reduced. The outlet liquid accumulation coefficient is determined to be equal to the target liquid accumulation coefficient, and the opening degree of the expansion valve of the target heat exchange unit is controlled to remain unchanged.

19. A control device for a heating, ventilation, and air conditioning (HVAC) system, characterized in that, The control device includes: The control unit is used to determine that the HVAC system meets the preset pressure relief conditions and control the pressure relief module to open so that the suction port of the compressor that is not operating normally is connected to the exhaust port of the compressor.

20. A controller, characterized in that, Includes the control device for the HVAC system as described in claim 19.

21. A heating, ventilation, and air conditioning system, characterized in that, It includes the HVAC device as described in claim 7 and the controller as described in claim 20.

22. A computer-readable storage medium having a computer program stored thereon, characterized in that, The program is executed by a processor to implement the steps of the method as described in any one of claims 8-18.

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