Heating and ventilation device and heating and ventilation system

Abstract

The application discloses a heating and ventilation device and a heating and ventilation system. The device comprises a compressor unit and a first heat exchange unit in communication with the outside. The compressor unit and the first heat exchange unit are independently arranged. The compressor unit comprises a compressor and a gas-liquid separator. The first port of the gas-liquid separator is in communication with the first heat exchange unit. The gas phase outlet of the gas-liquid separator is in communication with the gas return port of the compressor. The second port of the gas-liquid separator is used for inputting two-phase heat exchange medium into the gas-liquid separator. In the heating process, the two-phase heat exchange medium transmitted by the second heat exchange unit in the room is separated into gaseous heat exchange medium and liquid heat exchange medium by the gas-liquid separator. The gaseous heat exchange medium directly flows back into the compressor, and the liquid heat exchange medium is transported to the first heat exchange unit in the outside. In this way, the content of the liquid heat exchange medium transported to the first heat exchange unit is increased, the heat exchange amount of the unit flow of the heat exchange medium in the first heat exchange unit is effectively increased, the heat transported to the room is increased, and the heating effect is improved.

Description

Technical Field

[0001] This application relates to the field of heating, ventilation and air conditioning (HVAC) technology, specifically to an HVAC device 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, in which the outdoor unit is split into a heat exchanger module and a compressor module. The compressor module is placed on the indoor side, and the heat exchanger module is suspended in the ceiling or integrated into the building.

[0003] However, due to the long connecting pipes between the compressor module and the heat exchanger module after the separation, the pressure loss and heat loss of the pipes seriously affect the system's capacity and energy efficiency in heating mode. Summary of the Invention

[0004] To address the technical problem in the prior art where the compressor module and heat exchanger module are installed separately and the connecting piping is long, resulting in impaired system performance, this application proposes a heating and ventilation device and system. During the heating process, a gas-liquid separator is used to separate the two-phase heat exchange medium. The separated gaseous heat exchange medium flows directly back into the compressor, while the liquid heat exchange medium is transported to the first heat exchange subunit outdoors. This effectively increases the heat exchange capacity per unit flow rate of the heat exchange medium at the first heat exchange subunit, thereby improving the heating effect.

[0005] The first aspect of this application provides a heating, ventilation and air conditioning (HVAC) device, the device comprising: a compressor unit and a first heat exchange unit connected to the outside, the compressor unit and the first heat exchange unit being independently configured; the compressor unit comprising a compressor and a gas-liquid separator;

[0006] The first port of the gas-liquid separator is connected to the first heat exchange unit.

[0007] The gas phase outlet of the gas-liquid separator is connected to the return gas port of the compressor;

[0008] The second port of the gas-liquid separator is used to input a two-phase heat exchange medium into the gas-liquid separator.

[0009] In some embodiments of this application, a second heat exchange unit connected to the indoor environment is also included; the first port of the gas-liquid separator is connected to the first heat exchange unit via a first liquid pipe group;

[0010] The first heat exchange unit is connected to the compressor via a first air pipe assembly;

[0011] The second port of the gas-liquid separator is connected to the second heat exchange unit via a second liquid pipe group;

[0012] The second heat exchange unit is connected to the compressor via a second gas pipe assembly.

[0013] In some embodiments of this application, the first heat exchange unit includes at least one first heat exchange subunit, the first liquid pipe group includes a first main liquid pipe section and a first branch liquid pipe section in the same number as the first heat exchange subunit; the first gas pipe group includes a first main gas pipe section and a first branch gas pipe section in the same number as the first heat exchange subunit.

[0014] The first end of each of the first heat exchange sub-units is connected in parallel to the first main liquid pipe section through the first branch liquid pipe section, and the second end of each of the first heat exchange sub-units is connected in parallel to the first main gas pipe section through the first branch gas pipe section.

[0015] In some embodiments of this application, the first heat exchange subunit includes a first heat exchanger and a first throttling valve, wherein the first heat exchanger is connected to the first throttling valve.

[0016] In some embodiments of this application, the first heat exchange unit includes at least two first heat exchange sub-units, and among the at least two first heat exchange sub-units, there are first heat exchange sub-units with different installation environments.

[0017] In some embodiments of this application, the HVAC device further includes a first housing and at least one second housing separate from the first housing;

[0018] The compressor unit is disposed in the first housing, which is located outdoors or indoors.

[0019] The second housing contains at least one of the first heat exchange subunits, and the second housing is located outdoors.

[0020] In some embodiments of this application, the HVAC device includes at least two second housings; and among the at least two second housings, there are second housings with different installation environments.

[0021] In some embodiments of this application, a detection component is mounted on the outer surface of the second housing, the detection component being used to detect environmental parameters of the installation environment in which the second housing is located.

[0022] In some embodiments of this application, the detection component includes a temperature sensor and / or a humidity sensor.

[0023] In some embodiments of this application, the second heat exchange unit includes at least one second heat exchange subunit, the second liquid pipe group includes a second main liquid pipe section and a second branch liquid pipe section in the same number as the second heat exchange subunit; the second gas pipe group includes a second main gas pipe section and a second branch gas pipe section in the same number as the second heat exchange subunit.

[0024] The first end of each of the second heat exchange sub-units is connected in parallel to the second main liquid pipe section through the second branch liquid pipe section, and the second end of each of the second heat exchange sub-units is connected in parallel to the second main gas pipe section through the second branch gas pipe section.

[0025] In some embodiments of this application, the second heat exchange subunit includes a second heat exchanger and a second throttle valve, wherein the second heat exchanger is connected to the second throttle valve.

[0026] In some embodiments of this application, the compressor unit further includes a four-way valve, which includes an input port, a return port, a first valve port, and a second valve port;

[0027] 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 valve port is connected to the first heat exchange unit, and the second valve port is connected to the second heat exchange unit.

[0028] In some embodiments of this application, the HVAC system includes a plurality of compressor units connected in parallel.

[0029] In some embodiments of this application, when the heat exchange medium used in the HVAC system is a combustible refrigerant, refrigerant leakage detection devices are provided inside both the compressor unit and the second heat exchange unit;

[0030] A liquid pipe shut-off valve is provided on the first liquid pipe group and / or the second liquid pipe group, and a gas pipe shut-off valve is provided on the first gas pipe group and / or the second gas pipe group.

[0031] In some embodiments of this application, the first liquid pipe group includes a first main liquid pipe section, on which the liquid pipe shut-off valve is provided; and / or, the second liquid pipe group includes a second main liquid pipe section, on which the liquid pipe shut-off valve is provided;

[0032] The first tracheal assembly includes a first main tracheal segment, on which the tracheal shut-off valve is provided; and / or, the second tracheal assembly includes a second main tracheal segment, on which the tracheal shut-off valve is provided.

[0033] In some embodiments of this application, when the heat exchange medium used in the HVAC system is a combustible refrigerant, refrigerant leakage detection devices are provided inside both the compressor unit and the second heat exchange unit;

[0034] Each of the second branch liquid pipe sections is equipped with a liquid pipe shut-off valve, and each of the second branch gas pipe sections is equipped with a gas pipe shut-off valve.

[0035] In some embodiments of this application, when the liquid shut-off valve is located indoors and / or the gas shut-off valve is located indoors, a ventilation device is provided around the liquid shut-off valve and / or gas shut-off valve located indoors.

[0036] In some embodiments of this application, when the liquid shut-off valve is located indoors and / or the gas shut-off valve is located indoors, a refrigerant leak detection element is provided around the liquid shut-off valve and / or gas shut-off valve located indoors.

[0037] In some embodiments of this application, when the heat exchange medium used in the HVAC system is a combustible refrigerant, the compressor unit is provided with a ventilation device.

[0038] An embodiment of the second aspect of this application provides a heating, ventilation, and air conditioning system, including a controller and the heating, ventilation, and air conditioning device described in the first aspect above;

[0039] The controller is communicatively connected to the compressor unit and the first heat exchange unit.

[0040] Based on the above-mentioned HVAC device, control method, controller, and HVAC system, the technical solution of this application has the following beneficial effects or advantages:

[0041] A gas-liquid separator is installed in the compressor unit. The gas phase outlet of the gas-liquid separator is connected to the compressor's return port. The first port of the gas-liquid separator is connected to the first heat exchange unit, and the second port is used to input the two-phase heat exchange medium. During the heating process, the two-phase heat exchange medium is separated into gas and liquid phases by the gas-liquid separator. The separated gaseous heat exchange medium flows directly back into the compressor, while the liquid heat exchange medium is transported to the first outdoor heat exchange subunit. This increases the content of liquid heat exchange medium transported to the first heat exchange subunit, effectively increasing the heat exchange capacity per unit flow rate at the first heat exchange subunit, thereby increasing the heat delivered to the indoor side and improving the heating effect. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the structure of an existing HVAC device according to this application;

[0044] Figure 2 for Figure 1 The diagram shows the flow path of the heat exchange medium in the heating mode of the HVAC system shown.

[0045] Figure 3 for Figure 2 The pressure-enthalpy diagram corresponding to the flow path schematic shown;

[0046] Figure 4 This is a schematic diagram of the structure of a heating, ventilation, and air conditioning (HVAC) device according to an exemplary embodiment of this application;

[0047] Figure 5 This is another structural schematic diagram of a heating, ventilation, and air conditioning (HVAC) device according to an exemplary embodiment of this application;

[0048] Figure 6 for Figure 5 The diagram shows the flow path of the heat exchange medium in the heating mode of the HVAC system.

[0049] Figure 7 for Figure 6 The pressure-enthalpy diagram corresponding to the flow path schematic shown;

[0050] Figure 8 This is a schematic diagram of the structure of a heating, ventilation, and air conditioning system according to an exemplary embodiment of this application.

[0051] In the above figure:

[0052] 1. Compressor unit; 2. First heat exchange unit; 3. Second heat exchange unit; 4. First liquid pipe assembly; 5. First gas pipe assembly; 6. Second liquid pipe assembly; 7. Second gas pipe assembly; 8. Liquid pipe shut-off valve; 9. Gas pipe shut-off valve; 10. Controller.

[0053] 11, Compressor; 12, Gas-liquid separator; 13, Four-way valve; 21, First heat exchange subunit; 31, Second heat exchange subunit;

[0054] 41, First main liquid line segment; 42, First branch liquid line segment; 51, First main gas line segment; 52, First branch gas line segment; 61, Second main liquid line segment; 62, Second branch liquid line segment; 71, Second main gas line segment; 72, Second branch gas line segment;

[0055] 211, First heat exchanger; 212, First throttle valve; 311, Second heat exchanger; 312, Second throttle valve;

[0056] A, the first port of the gas-liquid separator; B, the second port of the gas-liquid separator; C, the gas phase outlet of the gas-liquid separator; E, the input port of the four-way valve; F, the return port of the four-way valve; G, the first valve port of the four-way valve; H, the second valve port of the four-way valve.

[0057] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0058] 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 a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0059] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0060] Furthermore, the use of terms such as "first," "second," etc., in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0061] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0062] Furthermore, the technical solutions of the various embodiments of this application can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this application.

[0063] See Figure 1 and 2 The existing HVAC system shown has an outdoor unit divided into a compressor module and a heat exchanger module. A gas pipe and a liquid pipe are needed to connect the compressor module and the heat exchanger module, and also to connect the compressor module and the indoor unit. In heating mode, the circulation process of the heat exchange medium in the HVAC system is as follows: the compressor compresses the low-temperature, low-pressure gaseous heat exchange medium into a high-temperature, high-pressure gaseous heat exchange medium, which is then transferred to the indoor unit through a four-way valve and a gas pipe. In the indoor unit, the high-temperature, high-pressure gaseous heat exchange medium is condensed into a liquid heat exchange medium, releasing heat during the condensation process to provide heat to the room. The condensed liquid heat exchange medium is then transferred to the outdoor heat exchanger module through a liquid pipe. In the heat exchanger module, the liquid heat exchange medium exchanges heat with the outdoor air, becoming a low-temperature, low-pressure gaseous heat exchange medium. This low-temperature, low-pressure gaseous heat exchange medium returns to the compressor through the gas pipe and the four-way valve from the compressor's return port. This cycle repeats continuously, enabling the heating operation of the HVAC system. Figure 1 and 2 The diagram schematically shows one compressor module, three heat exchanger modules, and three indoor units. Figure 2 The arrows in the diagram indicate the flow direction of the heat exchange medium in heating mode.

[0064] from Figure 2 As can be seen, the liquid heat exchange medium formed in the indoor unit first flows through the liquid pipe to the compressor module, and then from the compressor module to the outdoor heat exchanger module. During this process, the liquid heat exchange medium travels through a long pipe. The longer the pipe, the greater the pressure and heat loss, resulting in lower pressure within the pipe. This pressure drop causes some of the liquid heat exchange medium to vaporize, reverting to a gaseous state. Therefore, the liquid pipe flowing from the indoor unit → compressor → heat exchanger module is actually a two-phase heat exchange medium consisting of a mixture of liquid and gas. Furthermore, the longer this liquid pipe, the higher the proportion of the gaseous heat exchange medium in the two-phase heat exchange medium. At the outdoor heat exchanger module, only the liquid heat exchange medium can exchange heat with the outdoor air, becoming a gaseous heat exchange medium; the gaseous heat exchange medium in the two-phase heat exchange medium cannot exchange heat with the outdoor air. Therefore, compared with pure liquid heat exchange medium, the two-phase heat exchange medium has much less heat exchange at the heat exchanger module when the flow rate is the same. The reduced heat exchange leads to a decrease in indoor heating capacity and a reduction in heating efficiency.

[0065] Figure 3 The above is shown Figure 1 and 2 The pressure-enthalpy diagram corresponding to the structure shown is as follows: Figure 3 The five coordinate points a, b, e, f, and h correspond to respectively Figure 2 The pressure and enthalpy values ​​at the five locations a, b, e, f, and h indicated in the figure. Figure 3 The dark black broken line in the middle corresponds to Figure 1 and 2 Pressure and enthalpy at various points in the central circulation loop. Figure 3 The two light black curves in the middle are used to distinguish the different states of the heat exchange medium, from Figure 3 Starting from the left, the region to the left of the first curve represents the liquid phase, where the heat exchange medium is liquid. Between the two curves lies the two-phase region, where the heat exchange medium is a mixture of liquid and gas. To the right of the second curve is the gaseous phase, where the heat exchange medium is gaseous. From... Figure 3 Points a, b, and e show that the liquid refrigerant formed by condensation in the indoor unit changes from a liquid to a two-phase gaseous state during its transfer to the outdoor heat exchanger module. The two-phase heat exchange medium then exchanges heat in the heat exchanger module, becoming a gaseous heat exchange medium, which returns to the compressor's return port. From... Figure 3 As can be seen from point h, when the two-phase heat exchange medium is directly transported to the heat exchanger module for heat exchange, the compressor's suction pressure is very low, resulting in low system energy efficiency and poor heating effect.

[0066] Based on this, this application provides the following embodiments to solve or improve the problems existing in the prior art. To enable those skilled in the art to better understand the solutions of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0067] Figure 4 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 and a first heat exchange unit 2 connected to the outside, wherein the compressor unit 1 and the first heat exchange unit 2 are independently arranged; the compressor unit includes a compressor 11 and a gas-liquid separator 12; the first port A of the gas-liquid separator 12 is connected to the first heat exchange unit 2; the gas phase outlet C of the gas-liquid separator 12 is connected to the return gas port of the compressor 11; and the second port B of the gas-liquid separator 12 is used to input a two-phase heat exchange medium into the gas-liquid separator 12.

[0068] The compressor unit 1 and the first heat exchange unit 2 are independently configured, meaning that their mechanical installations are independent. In other words, unlike traditional multi-split HVAC systems where the compressor and outdoor unit are integrated into a single housing, in this embodiment, the compressor unit 1 and the first heat exchange unit 2 are separately configured, 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 outdoors.

[0069] The compressor 11 described above is used to compress a low-temperature, low-pressure gaseous heat exchange medium into a high-temperature, high-pressure gaseous heat exchange medium, so as to provide the necessary heat exchange medium flow for the HVAC system. Specifically, after the low-temperature, low-pressure gaseous heat exchange medium is drawn into the suction port of the compressor 11, it is compressed into a high-temperature, high-pressure gaseous heat exchange medium, and discharged into the system from the exhaust port of the compressor 11.

[0070] The gas-liquid separator 12 described above is a device for separating gas and liquid, used in HVAC systems to separate two-phase heat exchange media into gaseous heat exchange media and liquid heat exchange media.

[0071] The aforementioned first heat exchange unit 2 is connected to the outside and placed on the outdoor side, where it exchanges heat with the outdoor air. The compressor unit 1 provides 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, compared to a system where they are installed in the same casing to form an outdoor unit, the separate design requires less space for each unit, offering greater installation flexibility. Depending on the available space, the compressor unit 1 can be placed either indoors or outdoors. The first heat exchange unit 2 can be placed in a suitable location outdoors, allowing for flexible placement and overcoming installation limitations.

[0072] Compared to the existing solution where the compressor module 11 and the outdoor heat exchanger module are integrated into an outdoor unit, in this embodiment, the compressor unit 1 and the first heat exchange unit 2 are deployed separately and independently. The pipeline connecting the compressor unit 1 and the first heat exchange unit 2 is much longer than that of the existing solution. The longer pipeline will increase the pressure loss and heat loss of the pipeline, resulting in more gaseous heat exchange medium mixed in the liquid heat exchange medium flowing through the pipeline, which in turn leads to a decrease in heating efficiency.

[0073] To address this technical problem, this embodiment of the application includes a gas-liquid separator 12 in the compressor unit 1. The first port A of the gas-liquid separator 12 is connected to the first heat exchange unit 2, the second port B is used to input a two-phase heat exchange medium in heating mode, and the gas phase outlet C is connected to the return gas port of the compressor 11. Figure 4 As shown, the position of the gas phase outlet C on the gas-liquid separator 12 is higher than the positions of the first port A and the second port B. The heights of the first port A and the second port B from the bottom surface of the inner cavity of the gas-liquid separator 12 can be the same or different.

[0074] In heating mode, the liquid heat exchange medium generated by condensation on the indoor side flows through the liquid pipe to the gas-liquid separator 12, and enters the interior of the gas-liquid separator 12 from the second port B. Due to pressure loss and heat loss during the flow of the liquid heat exchange medium through the liquid pipe, some of the liquid heat exchange medium vaporizes into a gaseous state. Therefore, what actually enters the gas-liquid separator 12 from the second port B is a two-phase heat exchange medium. The gas-liquid separator 12 can separate the two-phase mixed heat exchange medium into a gaseous heat exchange medium and a liquid heat exchange medium. The lighter gaseous heat exchange medium floats in the upper part of the gas-liquid separator 12's inner cavity, while the relatively heavier liquid heat exchange medium sinks to the bottom of the gas-liquid separator 12's inner cavity. Thus, the gaseous heat exchange medium can flow out from the gas phase outlet C located in the upper part of the gas-liquid separator 12's inner cavity and return directly to the compressor 11's interior through the compressor 11's return port. The separated liquid heat exchange medium can flow out from the first port A of the gas-liquid separator 12 and enter the first heat exchange unit 2 through the pipeline between the gas-liquid separator 12 and the first heat exchange unit 2.

[0075] After separation by the gas-liquid separator 12, the content of gaseous heat exchange medium in the heat exchange medium flowing into the first heat exchange unit 2 is effectively reduced, resulting in higher purity of the liquid heat exchange medium flowing into the first heat exchange unit 2. This reduces pipeline losses between the compressor unit 1 and the first heat exchanger unit. It also allows for higher heat exchange at the first heat exchange unit 2 for the same flow rate of heat exchange medium, thereby increasing the heat released by the same flow rate of heat exchange medium on the indoor side, improving heating efficiency, and enhancing the energy efficiency of the split-type HVAC system.

[0076] In some embodiments of this application, see Figure 4 As shown, the HVAC system also includes a second heat exchange unit 3 connected to the indoor unit; the first port A of the gas-liquid separator 12 is connected to the first heat exchange unit 2 via a first liquid pipe group 4; the first heat exchange unit 2 is connected to the compressor 11 via a first gas pipe group 5; the second port B of the gas-liquid separator 12 is connected to the second heat exchange unit 3 via a second liquid pipe group 6; and the second heat exchange unit 3 is connected to the compressor 11 via a second gas pipe group 7.

[0077] The second heat exchange unit 3 is connected to the indoor unit and is placed on the indoor side. It is used to cool or heat the indoor unit.

[0078] The first liquid pipe group 4 is used to transfer liquid heat exchange medium, and may also transfer two-phase heat exchange medium. The second liquid pipe group 6 is used to transfer two-phase heat exchange medium. The first gas pipe group 5 and the second gas pipe group 7 are used to transfer gaseous heat exchange medium.

[0079] Based on the structure of the HVAC system described above, the circulation process of the heat exchange medium in the HVAC system is explained using both heating and cooling modes. In heating mode, compressor unit 1 compresses the low-temperature, low-pressure gaseous heat exchange medium into a high-temperature, high-pressure gaseous heat exchange medium, which is then transmitted to the indoor second heat exchange unit 3 via the second gas pipe group 7. In the second heat exchange unit 3, the high-temperature, high-pressure gaseous heat exchange medium is condensed into a liquid heat exchange medium, releasing heat during the condensation process to provide heat to the room. The condensed liquid heat exchange medium is then transmitted to the gas-liquid separator 12 via the second liquid pipe group 6. During this process, the liquid heat exchange medium becomes a two-phase heat exchange medium, which is then separated into a gaseous heat exchange medium and a liquid heat exchange medium by the gas-liquid separator 12. The gaseous heat exchange medium returns directly to compressor 11 from the gas phase outlet C of the gas-liquid separator 12. The liquid heat exchange medium is transmitted from the first port A of the gas-liquid separator 12 through the first liquid pipe group 4 to the outdoor first heat exchange unit 2. In the first heat exchange unit 2, the liquid heat exchange medium exchanges heat with the outdoor air and becomes a low-temperature, low-pressure gaseous heat exchange medium. This low-temperature, low-pressure gaseous heat exchange medium returns to the compressor 11 through the first gas pipe group 5. This cycle repeats continuously to achieve the heating operation of the HVAC system.

[0080] In cooling mode, compressor unit 1 compresses the low-temperature, low-pressure gaseous heat exchange medium into a high-temperature, high-pressure gaseous heat exchange medium, which is then transmitted to the outdoor first heat exchange unit 2 through the first gas pipe group 5. In the first heat exchange unit 2, the high-temperature, high-pressure gaseous heat exchange medium is condensed into a liquid heat exchange medium and transmitted to the gas-liquid separator 12 through the first liquid pipe group 4. The liquid then flows out from the second port B of the gas-liquid separator 12 and is transmitted to the indoor second heat exchange unit 3 through the second liquid pipe group 6. In the second heat exchange unit 3, the liquid heat exchange medium provides cooling capacity to the indoor environment and then becomes a low-temperature, low-pressure gaseous heat exchange medium. This low-temperature, low-pressure gaseous heat exchange medium is transmitted back to compressor unit 1 through the second gas pipe group 7. This cycle repeats continuously, thereby achieving the cooling operation of the HVAC system. During cooling operation, the gas-liquid separator 12 may not perform a separation function, but only serves to transmit the liquid heat exchange medium.

[0081] Compared to Figure 1The solution in this application, compared to the prior art, adds a gas-liquid separator 12 to the compressor unit 1. The gas phase outlet C of the gas-liquid separator 12 is connected to the return gas port of the compressor 11. The liquid pipe, which originally connected from the second heat exchange unit 3 to the compressor unit 1 and then to the first heat exchange unit 2, is split into a first liquid pipe group 4 and a second liquid pipe group 6. The gas-liquid separator 12 is connected between the first liquid pipe group 4 and the second liquid pipe group 6. Thus, in heating mode, the two-phase heat exchange medium transferred from the second heat exchange unit 3 to the gas-liquid separator 12 is separated into a gaseous heat exchange medium and a liquid heat exchange medium. The gaseous heat exchange medium can directly return to the compressor 11, while the liquid heat exchange medium is transferred to the first heat exchange unit 2 through the first liquid pipe group 4. In this way, the liquid heat exchange medium entering the first heat exchange unit 2 is essentially purified. Compared with the existing technology, the proportion of liquid heat exchange medium in the heat exchange medium of the same flow rate entering the first heat exchange unit 2 is higher. More heat is collected in the first heat exchange unit 2 through heat exchange with the outdoor air, so more heat can be transferred to the second heat exchange unit 3 indoors, thereby improving heating efficiency.

[0082] In some embodiments of this application, see Figure 5 As shown, the first heat exchange unit 2 includes at least one first heat exchange subunit 21, the first liquid pipe group 4 includes a first main liquid pipe section 41 and a first branch liquid pipe section 42 of the same number as the first heat exchange subunit 21; the first gas pipe group 5 includes a first main gas pipe section 51 and a first branch gas pipe section 52 of the same number as the first heat exchange subunit 21; wherein, the first end of each first heat exchange subunit 21 is connected in parallel to the first main liquid pipe section 41 through the first branch liquid pipe section 42, and the second end of each first heat exchange subunit 21 is connected in parallel to the first main gas pipe section 51 through the first branch gas pipe section 52. Figure 5 The diagram schematically shows three first heat exchange subunits 21.

[0083] The aforementioned first liquid pipe section 42 is used to transport the liquid heat exchange medium of the corresponding first heat exchange subunit 21, and the first main liquid pipe section 41 is used to merge the liquid heat exchange media transported by each of the first liquid pipe sections 42. The aforementioned first gas pipe section 52 is used to transport the gaseous heat exchange medium of the corresponding first heat exchange subunit 21, and the first main gas pipe section 51 is used to merge the gaseous heat exchange media transported by each of the first gas pipe sections 52.

[0084] In this embodiment, multiple first heat exchange sub-units 21 can be set in the first heat exchange unit 2, which can improve the capacity of the HVAC system. These first heat exchange sub-units 21 can be placed according to the outdoor installation environment space, thus better overcoming the problem of limited installation space. Each first heat exchange sub-unit 21 is connected to the gas-liquid separator 12 through its own connected first branch liquid pipe section 42 and first main liquid pipe section 41. After the two-phase heat exchange medium transmitted by the second heat exchange unit 3 is separated in the gas-liquid separator 12, the separated liquid heat exchange medium can be transmitted to each first heat exchange sub-unit 21 through the first main liquid pipe section 41 and each first branch liquid pipe section 42, thereby increasing the content of liquid heat exchange medium flowing to each first heat exchange sub-unit 21, increasing the heat exchange capacity of each first heat exchange sub-unit 21, and thus increasing the indoor heating capacity.

[0085] When the first heat exchange unit 2 includes multiple first heat exchange sub-units 21, each first heat exchange sub-unit 21 can be controlled independently. For example, the number of first heat exchange sub-units 21 to be activated can be determined according to the indoor heat exchange requirements, and only that number of first heat exchange sub-units 21 can be activated. In this case, valves can be installed on the first branch liquid pipe section 42 connected to each first heat exchange sub-unit 21. After determining which first heat exchange sub-unit 21 to control to be activated, the valve on the first branch liquid pipe section 42 corresponding to the activated first heat exchange sub-unit 21 is opened, and the valve on the first branch liquid pipe section 42 corresponding to the unactivated first heat exchange sub-unit 21 is closed. In this way, after the two-phase heat exchange medium from the second heat exchange unit 3 is separated into liquid heat exchange medium in the gas-liquid separator 12, it can be transferred to the activated first heat exchange sub-unit 21 through the first main liquid pipe section 41 and the first branch liquid pipe section 42 connected to the activated first heat exchange sub-unit 21, and will not be transferred to the unactivated first heat exchange sub-unit 21. This can greatly improve the control flexibility of the HVAC system and improve system performance.

[0086] In some embodiments of this application, see Figure 5 As shown, the first heat exchange subunit 21 includes a first heat exchanger 211 and a first throttle valve 212, with the first heat exchanger 211 connected to the first throttle valve 212.

[0087] Since the control parameter of the first throttle valve 212 includes the valve opening, the flow rate of the heat exchange medium entering the first heat exchanger 211 can be precisely controlled by controlling the valve opening of the first throttle valve 212. This allows the valve opening to be automatically adjusted according to changes in the external environment and / or indoor heat exchange requirements, thereby providing better cooling or heating effects.

[0088] In some embodiments of this application, the first heat exchange unit 2 includes at least two first heat exchange sub-units 21, and the at least two first heat exchange sub-units 21 include first heat exchange sub-units 21 with different installation environments.

[0089] The first heat exchange subunit 21, installed in different environments, is affected differently by its respective environment. For example, the outdoor temperature and humidity of the first heat exchange subunit 21 vary depending on its installation environment. This design allows for independent control of the operation of each first heat exchange subunit 21 based on its installation environment. Compared to the existing technology of centralized deployment, where the entire HVAC system is easily affected by the outdoor environment, the embodiments of this application effectively reduce the impact of the installation environment on system performance, optimizing overall operating efficiency and indoor comfort.

[0090] 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, which is located outdoors or indoors; at least one first heat exchange subunit 21 is disposed in the second housing, which is located outdoors.

[0091] A first heat exchange subunit 21 can be set in a second housing, or multiple first heat exchange subunits 21 can be set.

[0092] For example, in one implementation, the HVAC system includes a second housing, in which all the first heat exchange sub-units 21 of the first heat exchange unit 2 are installed. In another implementation, the HVAC system includes multiple second housings, in which all the first heat exchange sub-units 21 of the first heat exchange unit 2 are evenly distributed, meaning that the number of first heat exchange sub-units 21 in each second housing is equal. In yet another implementation, the HVAC system includes multiple second housings, in which the first heat exchange sub-units 21 of the first heat exchange unit 2 are not evenly distributed, meaning that the number of first heat exchange sub-units 21 in each second housing is not equal; for example, some second housings may have one first heat exchange sub-unit 21, while others may have more than one first heat exchange sub-unit 21, and the number of first heat exchange sub-units 21 in each second housing is variable.

[0093] Since the first heat exchange unit 2 and the compressor unit 1 are separate, the compressor unit 1 can be installed in the first housing (not shown in the figure), and the first heat exchange sub-unit 21 of the first heat exchange unit 2 can be 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.

[0094] In this embodiment, by placing the compressor unit 1 and the first heat exchange subunit 21 in separate housings and using mounting fittings (such as the first gas pipe group 5 and the first liquid 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 housings can be installed separately according to the size of the installation environment, providing more installation options and flexibility, thereby optimizing the installation space.

[0095] In some embodiments of this application, the HVAC system includes at least two second housings; and among the at least two second housings, there are second housings with different installation environments.

[0096] By installing the second housing in different installation environments, the outdoor environments of the first heat exchange sub-units 21 located in different second housings vary. Specifically, the outdoor environmental conditions such as temperature, humidity, and air pressure differ for each of the first heat exchange sub-units 21. Outdoor environmental conditions affect the performance of the first heat exchange sub-units 21; for example, excessively low outdoor temperatures can lead to frost formation, excessively high outdoor temperatures or direct sunlight in summer, and poor air circulation can all impact system performance. By placing different second housings in different installation environments, the HVAC system contains first heat exchange sub-units 21 in different installation environments. This allows for the control of at least one first heat exchange sub-unit 21 based on its environmental conditions to achieve cooling or heating. This improves the flexibility of system control. If a particular first heat exchange sub-unit 21 is significantly affected by the environment, it can be deactivated, and instead, those first heat exchange sub-units that are less affected by the environment can be activated. This effectively reduces the impact of the installation environment on system performance, optimizing overall operating efficiency and indoor comfort.

[0097] In some embodiments of this application, a detection component is mounted on the outer surface of the second housing, and the detection component is used to detect environmental parameters of the installation environment in which the second housing is located.

[0098] The aforementioned detection components may include a temperature sensor and / or a humidity sensor. The temperature sensor is used to measure the ambient dry-bulb temperature of the installation environment in which the second housing is located. The ambient dry-bulb temperature of the installation environment in which the second housing is located is the same as the ambient dry-bulb temperature corresponding to the first heat exchange subunit 21 installed within the second housing. When the detection components include a temperature sensor, the environmental parameter may include the ambient dry-bulb temperature.

[0099] The humidity sensor is used to measure the relative humidity of the installation environment in which the second housing is located. The relative humidity of the installation environment in which the second housing is located is the same as the relative humidity corresponding to the first heat exchange subunit 21 installed inside the second housing. When the detection component includes a humidity sensor, the environmental parameter may include relative humidity.

[0100] By detecting the environmental parameters of the installation environment of the first heat exchange subunit 21, the operation of each first heat exchange subunit 21 can be independently controlled based on the environmental parameters of the installation 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.

[0101] In some embodiments of this application, see Figure 5 As shown, the second heat exchange unit 3 includes at least one second heat exchange subunit 31, the second liquid pipe group 6 includes a second main liquid pipe section 61 and a second branch liquid pipe section 62 of the same number as the second heat exchange subunit 31; the second gas pipe group 7 includes a second main gas pipe section 71 and a second branch gas pipe section 72 of the same number as the second heat exchange subunit 31; wherein, the first end of each second heat exchange subunit 31 is connected in parallel to the second main liquid pipe section 61 through the second branch liquid pipe section 62, and the second end of each second heat exchange subunit 31 is connected in parallel to the second main gas pipe section 71 through the second branch gas pipe section 72. Figure 5 The diagram schematically shows three second heat exchange subunits 31.

[0102] The aforementioned second liquid pipe section 62 is used to transport the liquid heat exchange medium of the corresponding second heat exchange subunit 31, and the second main liquid pipe section 61 is used to merge the liquid heat exchange media transported by each of the second liquid pipe sections 62. The aforementioned second gas pipe section 72 is used to transport the gaseous heat exchange medium of the corresponding second heat exchange subunit 31, and the second main gas pipe section 71 is used to merge the gaseous heat exchange media transported by each of the second gas pipe sections 72.

[0103] In this embodiment, multiple second heat exchange sub-units 31 can be set in the second heat exchange unit 3, which can improve the capacity of the HVAC system. These second heat exchange sub-units 31 can be placed in different areas of the room, such as different rooms, thus better overcoming the problem of limited installation space. Each second heat exchange sub-unit 31 is connected to the gas-liquid separator 12 through its own connected second branch liquid pipe section 62 and second main liquid pipe section 61. This allows each second heat exchange sub-unit 31 to transfer its heat exchange medium to the gas-liquid separator 12. After the gas-liquid separator 12 separates the two-phase heat exchange medium, the separated liquid heat exchange medium can be transferred to each first heat exchange sub-unit 21 through the first main liquid pipe section 41 and each first branch liquid pipe section 42, thereby increasing the content of liquid heat exchange medium flowing to each first heat exchange sub-unit 21, increasing the heat exchange capacity of each first heat exchange sub-unit 21, and thus increasing the indoor heating capacity.

[0104] In some embodiments of this application, see Figure 5 As shown, the second heat exchange subunit 31 includes a second heat exchanger 311 and a second throttle valve 312, with the second heat exchanger 311 connected to the second throttle valve 312.

[0105] Since the control parameter of the second throttle valve 312 includes the valve opening, the flow rate of the heat exchange medium flowing through the second heat exchanger 311 can be precisely controlled by controlling the valve opening of the second throttle valve 312. This allows the valve opening to be automatically adjusted according to changes in the external environment and / or indoor heat exchange requirements, thereby providing better cooling or heating effects.

[0106] In some embodiments of this application, see Figure 5 As shown, the compressor unit 1 also includes a four-way valve 13, which includes an input port E, a return port F, a first valve port G, and a second valve port H.

[0107] The input port E is connected to the exhaust port of the compressor 11, the return port F is connected to the suction port of the compressor 11, the first valve port G is connected to the first heat exchange unit 2, and the second valve port H is connected to the second heat exchange unit 3.

[0108] When the first heat exchange unit 2 includes multiple first heat exchange sub-units 21, the first valve port G is connected to each of the first heat exchange sub-units 21. When the second heat exchange unit 3 includes multiple second heat exchange sub-units 31, the second valve port H is connected to each of the second heat exchange sub-units 31.

[0109] The aforementioned four-way valve 13 can be a four-way reversing valve, which is used to switch between cooling mode and heating mode by changing the flow direction of the heat exchange medium in the pipeline of the heating and ventilation system.

[0110] In this embodiment, the HVAC system may include one or more compressor units 1, one or more second heat exchange subunits 31, and one or more first heat exchange subunits 21. When multiple compressor units 1 are included, they are connected in parallel and can be arranged in an integrated or distributed manner. The multiple first heat exchange subunits 21 can also be arranged in an integrated or distributed manner. Optionally, at least two of the first heat exchange subunits 21 can be arranged in a distributed manner, so that the installation environments of the distributed first heat exchange subunits 21 are different, and therefore they will not be simultaneously affected by the installation environment, improving the flexibility of system installation and control. When the HVAC system includes multiple second heat exchange subunits 31, the multiple second heat exchange subunits 31 can be installed in different locations indoors, such as in different rooms.

[0111] The HVAC system includes one or more compressor units 1 that can be connected to one or more first heat exchange subunits 21 and one or more second heat exchange subunits 31 to form a complete air conditioning heat pump system. In the air conditioning heat pump system, one or more or all of the compressor units 1 and one or more or all of the first heat exchange subunits 21 can be turned off or on. The number of second heat exchange subunits 31 that can be turned on is determined by the user's needs.

[0112] like Figure 6 The HVAC system shown schematically includes a compressor unit 1, three first heat exchange subunits 21, and three second heat exchange subunits 31. Figure 6 The arrows indicate the flow direction of the heat exchange medium in the HVAC system during heating mode. (Reference) Figure 6 When the HVAC system needs to operate in heating mode, the input port E of the four-way valve 13 is connected to the second valve port H of the four-way valve 13, and the first valve port G of the four-way valve 13 is connected to the return port F of the four-way valve 13. As a result, the compressor 11 compresses the low-temperature and low-pressure gaseous heat exchange medium into a high-temperature and high-pressure gaseous heat exchange medium, and then outputs it to the second gas pipe group 7 through the input port E and the second valve port H of the four-way valve 13. The high-temperature and high-pressure gaseous heat exchange medium is then transferred to the second heat exchange subunit 31 through the second gas pipe group 7. In the second heat exchange subunit 31, the gaseous heat exchange medium condenses into a liquid heat exchange medium to achieve indoor heating. Then, it is transferred to the gas-liquid separator 12 through the second liquid pipe group 6 and enters the interior of the gas-liquid separator 12 from the second port B. Because the second liquid pipe group 6 has losses such as pressure loss and heat loss, the medium transmitted to the gas-liquid separator 12 is a two-phase heat exchange medium. The gas-liquid separator 12 separates the two-phase heat exchange medium into a gaseous heat exchange medium and a liquid heat exchange medium.

[0113] In this process, the gaseous heat exchange medium exits the gas-liquid separator 12 from the gas phase outlet C and returns directly to the compressor 11 through the return port. The separated liquid heat exchange medium exits the gas-liquid separator 12 from the first port A and is transferred to the first heat exchange subunit 21 via the first liquid pipe group 4. In the first heat exchange subunit 21, the liquid heat exchange medium evaporates and absorbs heat to form a low-temperature, low-pressure gaseous heat exchange medium. This low-temperature, low-pressure gaseous heat exchange medium is then transferred to the compressor 11 through the first gas pipe group 5 and the first valve port G and return port F of the four-way valve 13. This cycle repeats continuously, enabling the heating operation of the HVAC system.

[0114] In the aforementioned heating process, the two-phase heat exchange medium transmitted from the second heat exchange subunit 31 indoors is separated into gas and liquid phases by the gas-liquid separator 12. The gaseous heat exchange medium flows directly back into the compressor 11, while the liquid heat exchange medium is transported to the first heat exchange subunit 21 outdoors. This increases the content of liquid heat exchange medium transported to the first heat exchange subunit 21, effectively increasing the heat exchange capacity per unit flow rate at the first heat exchange subunit 21, thereby increasing the heat delivered indoors and improving the heating effect.

[0115] Figure 7 The above is shown Figure 6 The pressure-enthalpy diagram corresponding to the structure shown is as follows: Figure 7 The eight coordinate points a, b, c, d, e, f, g, and h correspond to... Figure 6 The pressure and enthalpy values ​​at the eight locations indicated in the figure are shown. Figure 7 The dark black broken line in the middle corresponds to Figure 6 Pressure and enthalpy at various points in the central circulation loop. Figure 7 The two light black curves in the middle are used to distinguish the different states of the heat exchange medium, from Figure 7 Starting from the left, the region to the left of the first curve represents the liquid phase, where the heat exchange medium is liquid. Between the two curves lies the two-phase region, where the heat exchange medium is a mixture of liquid and gas. To the right of the second curve is the gaseous phase, where the heat exchange medium is gaseous. From... Figure 7 As can be seen from points ab, the liquid refrigerant formed by condensation in the indoor unit changes from a liquid to a two-phase gas-liquid mixture during its transfer to the gas-liquid separator 12. The two-phase heat exchange medium is separated into a gaseous heat exchange medium and a liquid heat exchange medium in the gas-liquid separator 12. The separated gaseous heat exchange medium returns directly to the compressor 11 via points d and h. The separated liquid refrigerant enters the first outdoor heat exchange unit 2 via points c and e, where it undergoes heat exchange and becomes a gaseous heat exchange medium, before returning to the compressor 11 via points f, g, and h.

[0116] contrast Figure 7 The pressure-enthalpy diagram of the embodiment of this application shown is... Figure 3 The pressure-enthalpy diagram of the prior art is shown. In this embodiment, by adding a gas-liquid separator 12 to separate the two-phase heat exchange medium from the second heat exchange unit 3, the gaseous heat exchange medium returns directly to the compressor 11, while the liquid heat exchange medium is transported to the first heat exchange unit 2, thus reducing the suction pressure of the compressor 11 from... Figure 3 The coordinates of h in the middle become Figure 7 The coordinates of point h in the middle are equivalent to starting from... Figure 7 Point g in the diagram has moved to point h. Clearly, the suction pressure of compressor 11 has increased significantly, resulting in a substantial increase in suction density and system capacity. Meanwhile, the work done by compressor 11, i.e., the enthalpy difference between its suction and discharge, remains relatively unchanged, thus significantly improving system energy efficiency.

[0117] When the HVAC system needs to operate in cooling mode, the input port E of the four-way valve 13 is connected to the first valve port G of the four-way valve 13, and the second valve port H of the four-way valve 13 is connected to the return port F of the four-way valve 13. 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 E and the first valve port G of the four-way valve 13 to the first gas pipe group 5. The high-temperature, high-pressure gaseous heat exchange medium is then transferred through the first gas pipe group 5 to the first heat exchange subunit 21. In the first heat exchange subunit 21, the gaseous heat exchange medium is condensed into a high-temperature, high-pressure liquid heat exchange medium, which is then transferred through the first liquid pipe group 4 to the gas-liquid separator 12. The liquid enters the gas-liquid separator 12 from its first port A and then flows out from its second port B, being transferred through the second liquid pipe group 6 to the second heat exchange subunit 31. In the second heat exchange subunit 31, the liquid heat exchange medium is evaporated and heat absorbed 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 7 and the second valve port H and return port F of the four-way valve 13. This cycle is repeated to realize the cooling operation of the HVAC system.

[0118] In the aforementioned refrigeration process, the gas-liquid separator 12 serves to transport the heat exchange medium. Of course, if the liquid heat exchange medium from the first heat exchange subunit 21 contains gaseous heat exchange medium, gas-liquid separation can be achieved in the gas-liquid separator 12, with the gaseous heat exchange medium returning directly to the compressor 11. The separated liquid heat exchange medium is transported to the second heat exchange subunit 31 indoors, where it exchanges heat with the indoor air, achieving refrigeration. After separation by the liquid separator, the content of the liquid heat exchange medium flowing to the second heat exchange subunit 31 is increased, effectively increasing the cooling capacity provided by a unit flow rate of heat exchange medium in the second heat exchange subunit 31, thus improving the refrigeration effect.

[0119] In some embodiments of this application, see Figure 5When the heat exchange medium used in the HVAC system is a flammable refrigerant, a refrigerant leakage detection device (not shown in the figure) is installed inside the compressor unit 1 and the second heat exchange unit 3; a liquid pipe shut-off valve 8 is installed on the first liquid pipe group 4 and / or the second liquid pipe group 6, and a gas pipe shut-off valve 9 is installed on the first gas pipe group 5 and / or the second gas pipe group 7.

[0120] Figure 5 The diagram schematically shows that liquid pipe shut-off valves 8 are installed on both the first liquid pipe group 4 and the second liquid pipe group 6, and gas pipe shut-off valves 9 are installed on both the first gas pipe group 5 and the second gas pipe group 7.

[0121] The liquid pipe shut-off valve 8 is located between the first heat exchange unit 2 and the second heat exchange unit 3, and the gas pipe shut-off valve 9 can be located between the compressor unit 1 and the first heat exchange unit 2, and / or, the gas pipe shut-off valve 9 can be located between the compressor unit 1 and the second heat exchange unit 3.

[0122] The aforementioned refrigerant leak detection device is used to detect the surrounding refrigerant concentration. When the refrigerant concentration detected by the device exceeds a preset concentration, it indicates a refrigerant leak. In other words, if the refrigerant leak detection device inside compressor unit 1 detects a refrigerant concentration exceeding the preset concentration, it indicates a refrigerant leak inside compressor unit 1. Similarly, if the refrigerant leak detection device inside the second heat exchange unit 3 detects a refrigerant concentration exceeding the preset concentration, it indicates a refrigerant leak inside the second heat exchange unit 3.

[0123] The refrigerant leak detection device can be implemented in various forms such as gas sensors and concentration sensors. This application does not specify the implementation form of the refrigerant leak detection device.

[0124] It should be noted that since each of the second heat exchange sub-units 31 in the second heat exchange unit 3 is placed in a different indoor space, each of the second heat exchange sub-units 31 can be equipped with a refrigerant leakage detection device to detect whether there is a refrigerant leakage inside the unit.

[0125] The aforementioned liquid refrigerant shut-off valve 8 is used to open and close the flow of liquid refrigerant in the pipeline. Therefore, the liquid refrigerant shut-off valve 8 has two states: open and closed. In the open state, the liquid refrigerant in the pipeline flows freely. In the closed state, the liquid refrigerant in the pipeline is cut off and cannot flow.

[0126] The aforementioned gas pipe shut-off valve 9 is used to open and close the flow of gaseous refrigerant in the pipeline. Therefore, the gas pipe shut-off valve 9 also has two states: open and closed. In the open state, the gaseous refrigerant in the pipeline flows freely. In the closed state, the gaseous refrigerant in the pipeline is cut off and cannot flow.

[0127] In the event of a refrigerant leak, the refrigerant is cut off to the outdoor side by closing the liquid line shut-off valve 8 and the gas line shut-off valve 9. The specific control logic is as follows:

[0128] If any refrigerant leak detection device detects a refrigerant leak, the control liquid pipe shut-off valve 8 is closed, and the HVAC system is operated in cooling mode to circulate the refrigerant on the indoor side to the first heat exchange unit 2 and condense it into liquid. Since the liquid refrigerant is cut off by the liquid pipe shut-off valve 8, the liquid refrigerant cannot enter the second heat exchange unit 3 on the indoor side through the liquid pipe. The liquid refrigerant is stored inside the first heat exchange unit 2 on the outdoor side, thereby realizing the recovery of the refrigerant from the second heat exchange unit 3 on the indoor side to the first heat exchange unit 2 on the outdoor side. After the HVAC system has completed the refrigerant recovery by operating in cooling mode, the control gas pipe shut-off valve 9 is closed.

[0129] In this embodiment, refrigerant leak detection devices are installed inside both the compressor unit 1 and the second heat exchange unit 3 to detect refrigerant leaks. Liquid pipe shut-off valves 8 are installed on the first liquid pipe assembly 4 and / or the second liquid pipe assembly 6, and gas pipe shut-off valves 9 are installed on the first gas pipe assembly 5 or the second gas pipe assembly 7. The liquid pipe shut-off valves 8 and 9 are used to cut off the refrigerant supply to the outdoor side. When any refrigerant leak detection device detects a refrigerant leak, the liquid pipe shut-off valve 8 is closed first, and the HVAC system is operated in cooling mode, circulating the refrigerant to the first heat exchange unit 2 on the outdoor side. The first heat exchange unit 2 condenses the refrigerant into a liquid state. Since the liquid refrigerant is cut off by the liquid pipe shut-off valve 8, the refrigerant cannot enter the second heat exchange unit 3 on the indoor side through the liquid pipe. Instead, it is stored inside the first heat exchange unit 2, realizing the recovery of the refrigerant from the second heat exchange unit 3 on the indoor side to the first heat exchange unit 2 on the outdoor side. This reduces the amount of refrigerant leakage on the indoor side and improves the safety of using flammable refrigerant. After the refrigerant recovery is completed, the gas pipe shut-off valve 9 is closed to prevent the refrigerant from flowing back to the second heat exchange unit 3 on the indoor side through the gas pipe, thus more thoroughly cutting off the refrigerant on the outdoor side.

[0130] It should be noted that the endotracheal shut-off valve 9 and the liquid shut-off valve 8 can be either electronic expansion valves or solenoid valves. This application does not limit the specific implementation of the endotracheal shut-off valve 9 and the liquid shut-off valve 8, as long as it can ensure that the endotracheal shut-off valve 9 and the liquid shut-off valve 8 have open and closed states.

[0131] In some embodiments of this application, the first liquid pipe group 4 includes a first main liquid pipe section 41, on which a liquid pipe shut-off valve 8 is provided; and / or, the second liquid pipe group 6 includes a second main liquid pipe section 61, on which a liquid pipe shut-off valve 8 is provided; the first air pipe group 5 includes a first main air pipe section 51, on which an air pipe shut-off valve 9 is provided; and / or, the second air pipe group 7 includes a second main air pipe section 71, on which an air pipe shut-off valve 9 is provided.

[0132] Based on this, there are multiple configuration options for the tracheal shut-off valve 9 and the liquid shut-off valve 8. The following are some examples of configuration options, but in actual applications, they are not limited to the configuration options listed below.

[0133] In the first configuration: the liquid shut-off valve 8 is installed on the first main liquid pipe section 41, and the gas shut-off valve 9 is installed on the first main gas pipe section 51. That is, the gas shut-off valve 9 is installed on the main piping between the compressor unit 1 and the first heat exchange unit 2. Since the first heat exchange unit 2 is located outdoors, the gas shut-off valve 9 can be installed outdoors, and the liquid shut-off valve 8 can be installed on the main piping between the first heat exchange unit 2 and the gas-liquid separator 12.

[0134] The second configuration: the liquid pipe shut-off valve 8 is installed on the first main liquid pipe section 41, and the gas pipe shut-off valve 9 is installed on the second main gas pipe section 71. That is, the liquid pipe shut-off valve 8 is installed on the main piping between the first heat exchange unit 2 and the gas-liquid separator 12. The gas pipe shut-off valve 9 is installed on the main piping between the compressor unit 1 and the second heat exchange unit 3.

[0135] The third configuration: the liquid pipe shut-off valve 8 is installed on the second main liquid pipe section 61, and the gas pipe shut-off valve 9 is installed on the first main gas pipe section 51. That is, the liquid pipe shut-off valve 8 is installed on the main piping between the second heat exchange unit 3 and the gas-liquid separator 12. The gas pipe shut-off valve 9 is installed on the main piping between the compressor unit 1 and the first heat exchange unit 2.

[0136] The fourth configuration: the liquid pipe shut-off valve 8 is installed on the second main liquid pipe section 61, and the gas pipe shut-off valve 9 is installed on the second main gas pipe section 71. That is, the liquid pipe shut-off valve 8 is installed on the main piping between the second heat exchange unit 3 and the gas-liquid separator 12. The gas pipe shut-off valve 9 is installed on the main piping between the compressor unit 1 and the second heat exchange unit 3.

[0137] In this implementation, by setting the liquid pipe shut-off valve 8 on the main liquid pipe section and the gas pipe shut-off valve 9 on the main gas pipe section, the overall refrigerant flow can be cut off, preventing the refrigerant from entering any of the second heat exchange sub-units 31 in the second heat exchange unit 3.

[0138] In some other embodiments of this application, when the heat exchange medium used in the HVAC system is a combustible refrigerant, refrigerant leakage detection devices are provided inside the compressor unit 1 and the second heat exchange unit 3; a liquid pipe shut-off valve 8 is provided on each second liquid pipe section 62, and a gas pipe shut-off valve 9 is provided on each second gas pipe section 72.

[0139] Since each second heat exchange subunit 31 is equipped with a liquid pipe shut-off valve 8 and a gas pipe shut-off valve 9, if there is a refrigerant leak in any of the indoor second heat exchange subunits 31, it is only necessary to shut off the refrigerant in that second heat exchange subunit 31 without affecting the normal operation of other second heat exchange subunits 31.

[0140] In this implementation, by separately equipping each second heat exchange subunit 31 with a liquid pipe shut-off valve 8 and a gas pipe shut-off valve 9, any second heat exchange subunit 31 that leaks refrigerant can be individually shut off, thus enabling flexible control.

[0141] It should be noted that when the liquid shut-off valve 8 is located indoors and / or the gas shut-off valve 9 is located indoors, a ventilation device (not shown in the figure) is provided around the liquid shut-off valve 8 and / or the gas shut-off valve 9 located indoors. This ventilation device is used to open the ventilation device in case of refrigerant leakage so as to discharge the leaked refrigerant to the outside.

[0142] Furthermore, when the liquid shut-off valve 8 is located indoors and / or the gas shut-off valve 9 is located indoors, a refrigerant leak detection device (not shown in the figure) is provided around the liquid shut-off valve 8 and / or the gas shut-off valve 9 located indoors. This refrigerant leak detection device is used to detect whether there is a refrigerant leak.

[0143] In some embodiments of this application, when the heat exchange medium used in the HVAC system is a combustible refrigerant, the compressor unit 1 is provided with a ventilation device to open the ventilation device in case of refrigerant leakage, so as to discharge the leaked refrigerant to the outside.

[0144] In this embodiment, a gas-liquid separator 12 is provided in the compressor unit 1. The gas phase outlet C of the gas-liquid separator 12 is connected to the return gas port of the compressor 11. The first port A of the gas-liquid separator 12 is connected to the first heat exchange unit 2, and the second port B of the gas-liquid separator 12 is connected to the second heat exchange unit 3. During the heating process, the gas-liquid separator 12 separates the two-phase heat exchange medium transmitted from the second heat exchange subunit 31 indoors. The separated gaseous heat exchange medium flows directly back into the compressor 11, while the liquid heat exchange medium is transported to the first heat exchange subunit 21 outdoors. This increases the content of liquid heat exchange medium transported to the first heat exchange subunit 21, effectively increasing the heat exchange capacity per unit flow rate at the first heat exchange subunit 21, thereby increasing the heat delivered indoors and improving the heating effect.

[0145] Some embodiments of this application also provide a heating, ventilation, and air conditioning system, see [link / reference] Figure 8 The HVAC system includes a controller 10 and the HVAC device described in any of the preceding embodiments; the controller 10 is communicatively connected to the compressor unit 1 and the first heat exchange unit 2.

[0146] Based on the structure of the HVAC system described in the foregoing embodiments, specifically, the controller 10 is connected to the four-way valve 13, compressor 11, and gas-liquid separator 12 in compressor unit 1, and the controller 10 is also connected to the first heat exchanger 211 and first throttling valve 212 included in each first heat exchange subunit 21 of the first heat exchange unit 2. In other embodiments, the controller 10 is also connected to the second heat exchanger and second throttling valve included in each second heat exchange subunit 31 of the second heat exchange unit 3. The controller 10 is also connected to a detection component provided on the outer surface of the second housing for mounting the first heat exchange subunit 21, and to components such as refrigerant leak detection device, liquid pipe shut-off valve 8, and gas pipe shut-off valve 9 provided in the HVAC system. This enables communication between the controller 10 and its connected components to operate the cooling or heating program of the HVAC system.

[0147] The above description is merely a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A heating, ventilation, and air conditioning (HVAC) device, characterized in that, The device includes: a compressor unit and a first heat exchange unit connected to the outside, wherein the compressor unit and the first heat exchange unit are independently configured; the compressor unit includes a compressor and a gas-liquid separator. The first port of the gas-liquid separator is connected to the first heat exchange unit. The gas phase outlet of the gas-liquid separator is connected to the return gas port of the compressor; The second port of the gas-liquid separator is used to input a two-phase heat exchange medium into the gas-liquid separator.

2. The apparatus as claimed in claim 1, characterized in that, It also includes a second heat exchange unit that is connected to the indoor space; The first port of the gas-liquid separator is connected to the first heat exchange unit via a first liquid pipe group. The first heat exchange unit is connected to the compressor via a first air pipe assembly; The second port of the gas-liquid separator is connected to the second heat exchange unit via a second liquid pipe group; The second heat exchange unit is connected to the compressor via a second gas pipe assembly.

3. The apparatus as described in claim 2, characterized in that, The first heat exchange unit includes at least one first heat exchange subunit; the first liquid pipe group includes a first main liquid pipe section and a first branch liquid pipe section in the same number as the first heat exchange subunit; the first gas pipe group includes a first main gas pipe section and a first branch gas pipe section in the same number as the first heat exchange subunit. The first end of each of the first heat exchange sub-units is connected in parallel to the first main liquid pipe section through the first branch liquid pipe section, and the second end of each of the first heat exchange sub-units is connected in parallel to the first main gas pipe section through the first branch gas pipe section.

4. The apparatus as described in claim 3, characterized in that, The first heat exchange subunit includes a first heat exchanger and a first throttle valve, and the first heat exchanger is connected to the first throttle valve.

5. The apparatus as described in claim 3 or 4, characterized in that, The first heat exchange unit includes at least two first heat exchange sub-units, and among the at least two first heat exchange sub-units, there are first heat exchange sub-units with different installation environments.

6. The apparatus as described in claim 3 or 4, characterized in that, The HVAC system further includes a first housing and at least one second housing separate from the first housing; The compressor unit is disposed in the first housing, which is located outdoors or indoors. The second housing contains at least one of the first heat exchange subunits, and the second housing is located outdoors.

7. The apparatus as claimed in claim 6, characterized in that, The HVAC system includes at least two second housings; among the at least two second housings, there are second housings with different installation environments.

8. The apparatus as claimed in claim 7, characterized in that, A detection component is installed on the outer surface of the second housing, and the detection component is used to detect the environmental parameters of the installation environment in which the second housing is located.

9. The apparatus as claimed in claim 8, characterized in that, The detection components include a temperature sensor and / or a humidity sensor.

10. The apparatus as claimed in claim 2, characterized in that, The second heat exchange unit includes at least one second heat exchange subunit; the second liquid pipe group includes a second main liquid pipe section and a second branch liquid pipe section in the same number as the second heat exchange subunit; the second gas pipe group includes a second main gas pipe section and a second branch gas pipe section in the same number as the second heat exchange subunit. The first end of each of the second heat exchange sub-units is connected in parallel to the second main liquid pipe section through the second branch liquid pipe section, and the second end of each of the second heat exchange sub-units is connected in parallel to the second main gas pipe section through the second branch gas pipe section.

11. The apparatus as claimed in claim 10, characterized in that, The second heat exchange subunit includes a second heat exchanger and a second throttle valve, with the second heat exchanger connected to the second throttle valve.

12. The apparatus according to any one of claims 2-4, 10, and 11, characterized in that, The compressor unit also includes a four-way valve, which includes an input port, a return port, a first valve port, and a second valve port. 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 valve port is connected to the first heat exchange unit, and the second valve port is connected to the second heat exchange unit.

13. The apparatus as claimed in claim 12, characterized in that, The HVAC system includes multiple compressor units connected in parallel.

14. The apparatus as claimed in claim 2, characterized in that, When the heat exchange medium used in the HVAC system is a combustible refrigerant, refrigerant leakage detection devices are installed inside both the compressor unit and the second heat exchange unit; A liquid pipe shut-off valve is provided on the first liquid pipe group and / or the second liquid pipe group, and a gas pipe shut-off valve is provided on the first gas pipe group and / or the second gas pipe group.

15. The apparatus as claimed in claim 14, characterized in that, The first liquid pipe assembly includes a first main liquid pipe section, on which the liquid pipe shut-off valve is provided; and / or, the second liquid pipe assembly includes a second main liquid pipe section, on which the liquid pipe shut-off valve is provided; The first tracheal assembly includes a first main tracheal segment, on which the tracheal shut-off valve is provided; and / or, the second tracheal assembly includes a second main tracheal segment, on which the tracheal shut-off valve is provided.

16. The apparatus as claimed in claim 10, characterized in that, When the heat exchange medium used in the HVAC system is a combustible refrigerant, refrigerant leakage detection devices are installed inside both the compressor unit and the second heat exchange unit; Each of the second branch liquid pipe sections is equipped with a liquid pipe shut-off valve, and each of the second branch gas pipe sections is equipped with a gas pipe shut-off valve.

17. The apparatus according to any one of claims 14-16, characterized in that, In cases where the liquid shut-off valve is located indoors and / or the gas shut-off valve is located indoors, a ventilation device is provided around the liquid shut-off valve and / or gas shut-off valve located indoors.

18. The apparatus according to any one of claims 14-16, characterized in that, When the liquid shut-off valve is located indoors and / or the gas shut-off valve is located indoors, a refrigerant leak detection device is installed around the liquid shut-off valve and / or gas shut-off valve located indoors.

19. The apparatus according to any one of claims 1-4, 10, 11, 14-16, characterized in that, When the heat exchange medium used in the heating and ventilation system is a combustible refrigerant, the compressor unit is equipped with a ventilation device.

20. A heating, ventilation, and air conditioning system, characterized in that, Includes the controller and the HVAC system as described in any one of claims 1-19; The controller is communicatively connected to the compressor unit and the first heat exchange unit.

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