A heating and ventilation device

Abstract

The embodiment of the present application discloses a kind of heating and ventilation equipment, and the heating and ventilation equipment includes at least one indoor unit, at least one outdoor unit, gas pipe assembly and liquid pipe assembly, gas pipe assembly is connected to indoor unit and outdoor unit, and liquid pipe assembly is connected between indoor unit and outdoor unit, so that indoor unit and outdoor unit form refrigerant circulation by gas pipe assembly and liquid pipe assembly.The embodiment of the present application is by setting at least part of the pipeline of gas pipe assembly is steel pipe, or, at least part of the pipeline of liquid pipe assembly is steel pipe, or, at least part of gas pipe assembly and liquid pipe assembly is steel pipe, to reduce the manufacturing cost of heating and ventilation equipment.

Description

Technical Field

[0001] This application relates to the field of heating, ventilation and air conditioning (HVAC) equipment technology, and more specifically, to an HVAC device. Background Technology

[0002] HVAC equipment mainly includes heating equipment, ventilation equipment, air conditioning equipment, and gas equipment. Taking air conditioning equipment as an example, air conditioning equipment includes air conditioning connection pipes, indoor units, and outdoor units. Air conditioning connection pipes are mainly responsible for connecting the indoor and outdoor units and bear the task of refrigerant flow and heat exchange.

[0003] In related technologies, air conditioning connecting pipes are made of copper, and the manufacturing process for copper pipes is relatively mature. However, using copper pipes requires a large amount of copper material. In recent years, the price of copper has risen, which has led to a corresponding increase in the price of materials used to manufacture air conditioning connecting pipes, potentially increasing the cost of air conditioning equipment. Summary of the Invention

[0004] This application provides an HVAC device designed to reduce the manufacturing cost of HVAC equipment.

[0005] This application provides a heating, ventilation, and air conditioning (HVAC) device, which includes at least one indoor unit, at least one outdoor unit, a gas pipe assembly, and a liquid pipe assembly. The gas pipe assembly is connected between the indoor unit and the outdoor unit, and the liquid pipe assembly is connected between the indoor unit and the outdoor unit, so that the indoor unit and the outdoor unit form a refrigerant circulation through the gas pipe assembly and the liquid pipe assembly. At least a portion of the gas pipe assembly is made of steel, and / or at least a portion of the liquid pipe assembly is made of steel.

[0006] Furthermore, the number of indoor units is multiple, the liquid pipe assembly includes a liquid manifold, the liquid manifold connects multiple indoor units and the outdoor unit, the liquid manifold is used to divert the liquid working fluid of the outdoor unit to multiple indoor units, the gas pipe assembly includes a gas manifold, the manifold connects multiple indoor units and the outdoor unit, the gas manifold is used to merge the gas working fluid of multiple indoor units to the outdoor unit, wherein the gas manifold and / or the liquid manifold are steel pipes.

[0007] Further, the outdoor unit includes a first outdoor unit, and the indoor unit includes a first indoor unit and a second indoor unit; the liquid manifold includes a first liquid manifold, and the liquid pipe assembly further includes a liquid main pipe, a first liquid branch pipe, and a second liquid branch pipe. The liquid main pipe connects the outdoor unit to a first end of the first liquid manifold, the first liquid branch pipe connects the first indoor unit to a second end of the first liquid manifold, and the second liquid branch pipe connects the second indoor unit to a third end of the first liquid manifold; the gas manifold includes a first gas manifold, and the gas pipe assembly further includes a gas main pipe, a first gas branch pipe, and a second gas branch pipe. The gas main pipe connects the first outdoor unit to a first end of the first gas manifold, the first gas branch pipe connects the first indoor unit to a second end of the first gas manifold, and the second gas branch pipe connects the second indoor unit to a third end of the first gas manifold; wherein, at least one of the liquid main pipe, the first liquid branch pipe, the second liquid branch pipe, the gas main pipe, the first gas branch pipe, and the second gas branch pipe is a steel pipe.

[0008] Furthermore, the indoor unit also includes a third indoor unit, the liquid manifold also includes a second liquid manifold, the liquid pipe assembly also includes a third liquid manifold and a fourth liquid manifold, the first liquid manifold connects to the second end of the first liquid manifold and the first end of the second liquid manifold, the third liquid manifold connects to the second end of the second liquid manifold and the first indoor unit, and the fourth liquid manifold connects to the third end of the second liquid manifold and the third indoor unit; the gas manifold also includes a second gas manifold, the gas pipe assembly also includes a third gas manifold and a fourth gas manifold, the first gas manifold connects to the second end of the first gas manifold and the first end of the second gas manifold, the third gas manifold connects to the second end of the second gas manifold and the first indoor unit, and the fourth gas manifold connects to the third end of the second gas manifold and the third indoor unit; wherein, at least one of the third liquid manifold, the fourth liquid manifold, the third gas manifold, and the fourth gas manifold is a steel pipe.

[0009] Furthermore, the indoor unit also includes a fourth indoor unit, the liquid manifold also includes a third liquid manifold, and the gas pipe assembly also includes a fifth liquid manifold and a sixth liquid manifold. The second liquid manifold is connected to the third end of the first liquid manifold and the first end of the third liquid manifold, the fifth liquid manifold is connected to the second end of the third liquid manifold and the second indoor unit, and the sixth liquid manifold is connected to the third end of the third liquid manifold and the fourth indoor unit. The gas manifold also includes a third gas manifold, and the gas pipe assembly also includes a fifth gas manifold and a sixth gas manifold. The second gas manifold is connected to the third end of the first gas manifold and the first end of the third gas manifold, the fifth gas manifold is connected to the second end of the third gas manifold and the second indoor unit, and the sixth gas manifold is connected to the third end of the third gas manifold and the fourth indoor unit. At least one of the fifth liquid manifold, the sixth liquid manifold, the fifth gas manifold, and the sixth gas manifold is a steel pipe.

[0010] Furthermore, the number of outdoor units is multiple, and the liquid pipe assembly includes a liquid manifold that connects multiple outdoor units and multiple indoor units. The liquid manifold is used to collect the liquid working fluid from the multiple outdoor units and then deliver it to the multiple indoor units. The gas pipe assembly includes a gas distribution pipe that connects multiple outdoor units and multiple indoor units. The gas distribution pipe is used to distribute the gas working fluid from the multiple indoor units to the multiple outdoor units. The liquid manifold and / or the gas distribution pipe are steel pipes.

[0011] Furthermore, both the gas pipe assembly and the liquid pipe assembly are made of steel pipes. At least one of the liquid branch pipe and the gas branch pipe includes a tee steel pipe, two branch pipe joints, and a main pipe joint. The two branch pipe joints are respectively connected to the tee steel pipe. Each branch pipe joint includes a first steel section, a second steel section, and a third steel section connected in sequence. The first steel section is connected to the tee steel pipe, and the diameters of the first steel section, the second steel section, and the third steel section decrease sequentially. The main pipe joint is sleeved with the tee steel pipe.

[0012] Furthermore, the two pipe connectors have an end center distance R1, where R1 satisfies: 30mm≤R1≤100mm.

[0013] Furthermore, the tee pipe includes at least two pipe sections with different diameters, and the outer diameter ratio of two adjacent pipe sections of the tee pipe is Q, where 0.85≤Q≤1.15.

[0014] Furthermore, at least one of the liquid manifold and the gas manifold includes a steel connecting sleeve, one end of which is inserted into the main pipe joint, and the other end of which is connected to other steel pipes in the gas pipe assembly and the liquid pipe assembly.

[0015] Furthermore, at least one of the liquid manifold and the gas manifold also includes at least one extension pipe, each of the extension pipes being connected to the main pipe connector and one of the two branch pipe connectors, and the extension pipes being overlapped with the main pipe connector and / or the branch pipe connectors; wherein, the length of the overlap portion between the extension pipe and the corresponding main pipe connector and / or the branch pipe connector is L1, 5mm≤L1≤20mm.

[0016] Further, the gas pipe assembly and the liquid pipe assembly include steel pipes. At least one of the liquid manifold and the gas manifold includes a tee steel pipe, two first copper sleeves, and two second copper sleeves. The tee steel pipe includes a main pipe section and two branch pipe sections. The main pipe section and the two branch pipe sections are respectively connected to other steel pipes in the gas pipe assembly or the liquid pipe assembly. The two first copper sleeves are respectively connected to the two branch pipe sections. The first copper sleeve includes a tapered section and a connecting section. Each connecting section is connected to the corresponding branch pipe section. The tapered section is connected to the corresponding other steel pipe in the gas pipe assembly or the liquid pipe assembly. One end of each second copper sleeve is correspondingly inserted into a tapered section, and the other end of each second copper sleeve is sleeved with other steel pipes in the gas pipe assembly and the liquid pipe assembly.

[0017] Furthermore, the tapering section includes at least two copper sections, the diameter of which decreases sequentially along the direction away from the branch pipe section, and each copper section in the tapering section corresponds to another steel pipe in the gas pipe assembly or the liquid pipe assembly of a certain size specification.

[0018] Furthermore, the tapering section includes a first copper section and a second copper section, the diameter of the first copper section is larger than the diameter of the second copper section, the first copper section is connected to the connecting section, and the first copper section or the second copper section is connected to other steel pipes in the gas pipe assembly or the liquid pipe assembly of the corresponding size and specifications.

[0019] Furthermore, the tapering section includes a first copper section, a second copper section, and a third copper section. The diameters of the first copper section, the second copper section, and the third copper section decrease sequentially in the direction away from the branch pipe section. The first copper section is connected to the connecting section. The first copper section, the second copper section, or the third copper section is connected to other steel pipes in the gas pipe assembly or the liquid pipe assembly of the corresponding size and specifications.

[0020] Furthermore, the tapering section includes a first copper section, a second copper section, a third copper section, and a fourth copper section. The diameters of the first copper section, the second copper section, the third copper section, and the fourth copper section decrease sequentially in the direction away from the branch pipe section. The first copper section is connected to the connecting section. The first copper section, the second copper section, the third copper section, or the fourth copper section are connected to other steel pipes in the gas pipe assembly or the liquid pipe assembly of the corresponding size and specifications.

[0021] Furthermore, at least one of the liquid manifold and the gas manifold also includes a third copper sleeve and a fourth copper sleeve. The third copper sleeve is sleeved with the main pipe section, one end of the fourth copper sleeve is correspondingly inserted into the third copper sleeve, and the other end of the fourth copper sleeve is sleeved with other steel pipes in the gas pipe assembly and the liquid pipe assembly.

[0022] Furthermore, the liquid manifold and the gas manifold are made of the same material and comprise the following components by mass fraction: C 0%–0.02%, Si 0.5%–1%, Mn 1%–2%, Cr 16%–18%, Ni 9%–11%, Cu 2%–4%, Mo 0%–0.02%, P 0%–0.03%, S 0%–0.03%, with the balance being Fe and impurity elements, the total mass percentage of which is less than or equal to 0.2%.

[0023] Furthermore, both the liquid manifold and the gas manifold satisfy at least one of the following conditions:

[0024] (1) The resistance strength of the liquid manifold and the gas manifold is A, and A satisfies: 400MPa≤A≤600MPa;

[0025] (2) The yield strength of the liquid manifold and the gas manifold is B, and B satisfies: 140MPa≤B≤180MPa;

[0026] (3) The yield strength ratio of the liquid manifold and the gas manifold is C, where C satisfies: 0.23≤B≤0.45;

[0027] (4) The elongation of the liquid manifold and the gas manifold is D, and D satisfies: 50% ≤ D ≤ 80%;

[0028] (5) The hardness of the liquid manifold and the gas manifold is E, and E satisfies: 100Hv≤E≤120Hv;

[0029] (6) The MD30 values ​​of the liquid manifold and the gas manifold satisfy: -50℃≤MD30≤-80℃.

[0030] Furthermore, the outdoor unit includes a compressor, a four-way valve, an outdoor heat exchanger, a gas-liquid separator, an outdoor liquid-side connector, and an outdoor gas-side connector; the indoor unit includes an indoor heat exchanger and indoor gas-side connectors and indoor liquid-side connectors located on both sides of the indoor heat exchanger; the gas pipe assembly is connected between the outdoor gas-side connector and the indoor gas-side connector; the liquid pipe assembly is connected between the outdoor liquid-side connector and the indoor liquid-side connector.

[0031] Furthermore, the number of indoor units is multiple, and the liquid pipe assembly includes a liquid manifold connecting multiple indoor units and the outdoor unit for diverting the liquid working fluid of the outdoor unit to multiple indoor units; the gas pipe assembly includes a gas manifold connecting multiple indoor units and the outdoor unit for converging the gas working fluid of the multiple indoor units to the outdoor unit; wherein, the portion of the liquid pipe assembly between the liquid manifold and the outdoor liquid-side connector is made of steel pipe and / or the portion of the gas pipe assembly between the gas manifold and the outdoor gas-side connector is made of steel pipe, and the gas manifold and / or the liquid manifold are made of steel pipe.

[0032] The embodiments of this application reduce the cost of manufacturing the gas pipe assembly and the liquid pipe assembly by setting at least a portion of the pipes of the gas pipe assembly to be steel pipes, or at least a portion of both the gas pipe assembly and the liquid pipe assembly to be steel pipes, thereby reducing the manufacturing cost of the HVAC equipment. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments or 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 these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of a heating, ventilation, and air conditioning (HVAC) device in one embodiment of this application;

[0035] Figure 2 This is one of the structural schematic diagrams of a heating, ventilation, and air conditioning (HVAC) device in one embodiment of this application;

[0036] Figure 3 This is a second schematic diagram of the structure of the HVAC equipment in one embodiment of this application;

[0037] Figure 4 This is the third schematic diagram of the structure of the HVAC equipment in one embodiment of this application;

[0038] Figure 5 This is the fourth schematic diagram of the structure of the HVAC equipment in one embodiment of this application;

[0039] Figure 6 This is the fifth schematic diagram of the structure of the HVAC equipment in one embodiment of this application;

[0040] Figure 7 This is a schematic diagram of the structure of a liquid manifold or a gas manifold in one embodiment of this application;

[0041] Figure 8 This is a schematic diagram of the structure of a liquid manifold or a gas manifold in another embodiment of this application.

[0042] Reference numerals: 1-HVAC equipment; 10-Indoor unit; 11-First indoor unit; 12-Second indoor unit; 13-Third indoor unit; 14-Fourth indoor unit; 20-Outdoor unit; 21-First outdoor unit; 22-Second outdoor unit; 30-Gas piping assembly; 31-Gas branch pipe; 311-First gas branch pipe; 312-Second gas branch pipe; 313-Third gas branch pipe; 32-Gas main pipe; 33-First gas branch pipe; 34-Second gas branch pipe; 35-Third gas branch pipe; 36-Fourth gas branch pipe; 37-Fifth gas branch pipe; 38-Sixth gas branch pipe; 39-Gas branch pipe; 40-Liquid piping assembly; 41-Liquid branch pipe; 411-First... 412-Second liquid branch pipe; 413-Third liquid branch pipe; 42-Liquid main pipe; 43-First liquid branch pipe; 44-Second liquid branch pipe; 45-Third liquid branch pipe; 46-Fourth liquid branch pipe; 47-Fifth liquid branch pipe; 48-Sixth liquid branch pipe; 49-Liquid manifold; 50-Tee steel pipe; 51-Main pipe section; 52-Branch pipe section; 60-Branch pipe joint; 61-First steel section; 62-Second steel section; 63-Third steel section; 70-Main pipe joint; 80-Steel connecting sleeve; 90-First copper sleeve; 901-Connecting section; 902-Gradual reduction section; 91-Second copper sleeve; 92-Third copper sleeve; 93-Fourth copper sleeve; 95-Other steel pipes. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0044] Please see Figures 1-2This application provides a heating, ventilation and air conditioning (HVAC) device 1, which is a functional component of a building. The operation of the HVAC device 1 is closely related to the daily life of users in the building. The HVAC device 1 mainly includes heating equipment, ventilation equipment, air conditioning equipment, gas equipment, etc. This application does not specifically limit these components.

[0045] The HVAC system 1 may include at least one indoor unit 10 and at least one outdoor unit 20; that is, the HVAC system 1 may include one indoor unit 10 and one outdoor unit 20, or the HVAC system 1 may include multiple indoor units 10 and one outdoor unit 20, or the HVAC system 1 may include multiple indoor units 10 and multiple outdoor units 20. This application embodiment does not specifically limit this. The indoor unit 10 is mainly used to regulate and control the indoor air temperature and humidity; that is, the indoor unit 10 can maintain stable indoor temperature and humidity by drawing in indoor air, cooling or heating it, and then returning the treated air to the room. The main function of the outdoor unit 20 is to exhaust the high-temperature gas from the indoor environment to the outdoors, achieving a cooling effect through heat dissipation. It can be understood that the outdoor unit 20 may include a compressor, a four-way valve, an outdoor heat exchanger, and a gas-liquid separator. The compressor compresses the refrigerant, turning it into a high-temperature, high-pressure gas, thereby achieving heat exchange. The four-way valve can switch the cooling or heating function of the HVAC equipment 1 by changing the direction of the refrigerant flow. The outdoor heat exchanger releases the heat from the high-temperature, high-pressure gas into the outdoor air, cooling the gas and transforming it into a low-temperature, high-pressure liquid. This effectively transfers heat from the indoor environment to the outdoor environment, thus lowering the indoor temperature.

[0046] Furthermore, the HVAC equipment 1 may also include a gas pipe assembly 30 and a liquid pipe assembly 40. The gas pipe assembly 30 connects the indoor unit 10 and the outdoor unit 20, and the liquid pipe assembly 40 connects the indoor unit 10 and the outdoor unit 20. In this way, the indoor unit 10 and the outdoor unit 20 form a refrigerant circulation through the gas pipe assembly 30 and the liquid pipe assembly 40. The main function of the gas pipe assembly 30 is to transfer refrigerant gas, and its internal pressure is higher than that of the liquid pipe assembly 40. The liquid pipe assembly 40 is used to transfer liquid refrigerant and absorb heat. While completing cooling or heating, an appropriate pressure difference needs to be formed within the liquid pipe assembly 40 to ensure the normal operation of the refrigerant circulation. The refrigerant cycle is a process that uses the refrigerant to circulate at low and high temperatures to achieve functions such as cooling and heating. The working principle of the refrigerant cycle is based on the basic laws of thermodynamics. In the refrigeration cycle, the refrigerant is first compressed into a high-temperature and high-pressure gas in the compressor, then releases heat and becomes a liquid through the outdoor heat exchanger, then reduces the pressure and temperature through the expansion valve, and finally evaporates and absorbs heat in the evaporator. The refrigerant is then transferred through the liquid pipe assembly 40 and the gas pipe assembly 30, thus completing one cycle.

[0047] Furthermore, at least a portion of the piping in the gas assembly 30 is made of steel, or at least a portion of the piping in the liquid assembly 40 is made of steel, or at least a portion of both the gas assembly 30 and the liquid assembly 40 are made of steel. It is understood that the use of steel as a material for at least a portion of the gas assembly 30 and the liquid assembly 40, and the lower price of steel, helps reduce the manufacturing cost of the gas assembly 30 and the liquid assembly 40, thereby reducing the manufacturing cost of the HVAC equipment 1.

[0048] It should be noted that steel is an iron-carbon alloy material composed of iron and carbon, and may also contain other alloying elements such as manganese, silicon, phosphorus, and sulfur. Furthermore, steel has good plasticity, toughness, wear resistance, and corrosion resistance. There are many types of steel, and this application does not specifically limit them. For example, steel may include carbon steel, alloy steel, stainless steel, etc.

[0049] This application embodiment reduces the material cost of manufacturing the air pipe assembly 30 and the liquid pipe assembly 40 by setting at least a portion of the pipes of the air pipe assembly 30 to steel pipes, or at least a portion of both the air pipe assembly 30 and the liquid pipe assembly 40 to steel pipes, thereby reducing the manufacturing cost of the HVAC equipment 1.

[0050] In some embodiments, the outdoor unit 20 further includes an outdoor liquid-side connector and an outdoor gas-side connector, and the indoor unit 10 includes an indoor heat exchanger, and indoor gas-side connectors and indoor liquid-side connectors located on both sides of the indoor heat exchanger. A gas pipe assembly 30 is connected between the outdoor gas-side connector and the indoor gas-side connector to allow the gaseous working fluid of the indoor unit 10 to flow into the outdoor unit 20 through the gas pipe assembly 30; a liquid pipe assembly 40 is connected between the outdoor liquid-side connector and the indoor liquid-side connector to allow the liquid working fluid of the outdoor unit 20 to flow into the indoor unit 10 through the liquid pipe assembly 40.

[0051] Please see Figures 3-5In some embodiments, when there are multiple indoor units 10, the liquid pipe assembly 40 includes a liquid branch pipe 41, wherein the liquid branch pipe 41 connects multiple indoor units 10 and outdoor units 20, and the liquid branch pipe 41 is used to divert the liquid working fluid of the outdoor unit 20 to multiple indoor units 10, so that the liquid working fluid of the outdoor unit 20 is diverted through the liquid branch pipe 41 and delivered to each indoor unit 10; the gas pipe assembly 30 includes a gas branch pipe 31, the gas branch pipe 31 connects multiple indoor units 10 and outdoor units 20, and the gas branch pipe 31 is used to converge the gas working fluid of multiple indoor units 10 to outdoor units 20, so that the gas working fluid of each indoor unit 10 can be converged through the gas branch pipe 31 and delivered to outdoor units 20. Furthermore, at least one of the gas manifold 31 or the liquid manifold 41 is made of steel; that is, the gas manifold 31 is made of steel, or the liquid manifold 41 is made of steel, or both the gas manifold 31 and the liquid manifold 41 are made of steel. In this way, at least one of the gas manifold 31 and the liquid manifold 41 is made of steel, and steel is cheaper, which helps to reduce the manufacturing cost of at least one of the gas manifold 31 and the liquid manifold 41. Moreover, compared with the copper manifolds in the prior art, using steel manifolds helps to reduce flow resistance.

[0052] Furthermore, in some embodiments, the portion of the liquid pipe assembly 40 between the liquid manifold 41 and the outdoor liquid-side connector is made of steel; or, the portion of the gas pipe assembly 30 between the gas manifold 31 and the outdoor gas-side connector is made of steel; or, both the portion of the liquid pipe assembly 40 between the liquid manifold 41 and the outdoor liquid-side connector and the portion of the gas pipe assembly 30 between the gas manifold 31 and the outdoor gas-side connector are made of steel. In this way, at least one of the gas pipe assembly 30 and the portion of the liquid pipe assembly 40 is made of steel, and steel is cheaper, which helps to reduce the manufacturing cost of at least one of the gas pipe assembly 30 and the liquid pipe assembly 40.

[0053] In some embodiments, the liquid manifold 41 and the gas manifold 31 are made of the same steel pipe, and the steel pipe material specifically includes the following components by mass fraction:

[0054] C 0%–0.02%, Si 0%–1%, Mn 1%–2%, Cr 16%–18%, Ni 9%–11%, Cu 2%–4%, Mo 0%–0.02%, P 0%–0.03%, S 0%–0.03%, with the balance being Fe and impurity elements, the total mass percentage of impurity elements being less than or equal to 0.2%.

[0055] In the materials used to manufacture the liquid manifold 41 and the gas manifold 31, the addition of Cr and Ni elements endows the liquid manifold 41 and the gas manifold 31 with lower pitting corrosion potential, lower pitting corrosion weight loss, and lower martensitic transformation temperature. This makes it more difficult for the liquid manifold 41 and the gas manifold 31 to undergo martensitic phase transformation during processing, thereby achieving stronger resistance to pitting corrosion and stress corrosion, allowing for direct flame welding without annealing. In addition, the lower C element content makes it more difficult for the material to pass through the material sensitization range during hot working and welding, effectively controlling the formation of M23C6 carbides, thereby achieving stronger resistance to intergranular corrosion and effectively reducing welding defects. It is understood that the materials of the liquid manifold 41 and the gas manifold 31 in the embodiments of this application are the same, and correspondingly, the mechanical properties of the liquid manifold 41 and the gas manifold 31 (including but not limited to tensile strength, yield strength, yield strength ratio, elongation, and hardness as described below) are the same.

[0056] In some exemplary embodiments, the tensile strength of the liquid manifold 41 and the gas manifold 31 is A, which satisfies the following condition: 400MPa≤A≤600MPa. For example, A can be 400MPa, 450MPa, 500MPa, 550MPa, 600MPa, or any range thereof. The tensile strength is measured with reference to the national standard GB / T228.1-2021.

[0057] In some exemplary embodiments, the yield strength of the liquid manifold 41 and the gas manifold 31 is B, which satisfies: 140MPa≤B≤180MPa. For example, B can be 140MPa, 150MPa, 160MPa, 170MPa, 180MPa, or any range thereof. The yield strength is measured with reference to the national standard GB / T228.1-2021.

[0058] In some exemplary embodiments, the yield strength ratio of the liquid manifold 41 and the gas manifold 31 is C, where C satisfies: 0.23 ≤ B ≤ 0.45. For example, C can be 0.23, 0.30 MPa, 0.34 MPa, 0.40, 0.45, or any range thereof. The yield strength ratio C is the ratio of the yield strength B to the tensile strength A.

[0059] In some exemplary embodiments, the elongation of the liquid manifold 41 and the gas manifold 31 is D, where D satisfies: 50% ≤ D ≤ 80%. For example, D can be 50%, 55%, 60%, 70%, 80%, or any range thereof. The elongation is measured with reference to the national standard GB / T228.1-2021.

[0060] In some exemplary embodiments, the hardness of the liquid manifold 41 and the gas manifold 31 is E, where E satisfies: 100Hv ≤ E ≤ 120Hv. For example, E can be 100Hv, 120Hv, 135Hv, 140Hv, 150Hv, or any range thereof. The hardness is measured with reference to the national standard GB / T4340.1-2009.

[0061] In some exemplary embodiments, the MD30 values ​​of the liquid manifold 41 and the gas manifold 31 satisfy the following condition: -50℃ ≤ MD30 ≤ -80℃. For example, the MD30 value can be -50℃, -60℃, -65℃, -70℃, -80℃, or any range thereof. The MD30 value is one of the indicators of phase stability of a multi-component system, representing the electron orbital energy of each component of the steel material in the d orbital. The higher the MD30 value, the less stable the system, and the easier it is for intermetallic compounds such as the σ phase to form. In the embodiments of this application, the MD30 value of the steel material is between -50℃ and -80℃. A smaller MD30 value indicates a more stable steel material, which means that the steel material has a stronger resistance to aging cracking.

[0062] Please see Figure 3 In some embodiments, when the outdoor unit 20 includes a first outdoor unit 21 and the indoor unit 10 includes a first indoor unit 11 and a second indoor unit 12, the liquid branch pipe 41 may include a first liquid branch pipe 411, and the liquid pipe assembly 40 may also include a liquid main pipe 42, a first liquid branch pipe 43 and a second liquid branch pipe 44; the gas branch pipe 31 may include a first gas branch pipe 311, and the gas pipe assembly 30 may also include a gas main pipe 32, a first gas branch pipe 33 and a second gas branch pipe 34.

[0063] Specifically, the liquid main pipe 42 connects the outdoor unit 20 to the first end of the first liquid branch pipe 411, the first liquid branch pipe 43 connects the first indoor unit 11 to the second end of the first liquid branch pipe 411, and the second liquid branch pipe 44 connects the second indoor unit 12 to the third end of the first liquid branch pipe 411; the gas main pipe 32 connects the first outdoor unit 21 to the first end of the first gas branch pipe 311, the first gas branch pipe 33 connects the first indoor unit 11 to the second end of the first gas branch pipe 311, and the second gas branch pipe 34 connects the second indoor unit 12 to the third end of the first gas branch pipe 311, so as to realize the refrigerant circulation process between the first outdoor unit 21, the first indoor unit 11, and the second indoor unit 12 through the liquid main pipe 42, the first liquid branch pipe 43, the second liquid branch pipe 44, the gas main pipe 32, the first gas branch pipe 33, and the second gas branch pipe 34.

[0064] Furthermore, at least one of the liquid main pipe 42, the first liquid branch pipe 43, the second liquid branch pipe 44, the gas main pipe 32, the first gas branch pipe 33, and the second gas branch pipe 34 is made of steel; that is, at least one of the liquid main pipe, the first liquid branch pipe 43, the second liquid branch pipe 44, the gas main pipe 32, the first gas branch pipe 33, and the second gas branch pipe 34 is made of steel, which helps to reduce the manufacturing cost of at least one of the liquid pipe assembly 40 and the gas pipe assembly 30.

[0065] Please see Figure 4 The indoor unit 10 includes a first indoor unit 11 and a second indoor unit 12. In some embodiments, the indoor unit 10 also includes a third indoor unit 13.

[0066] Specifically, the liquid manifold 41 also includes a second liquid manifold 412, and the liquid pipe assembly 40 also includes a third liquid manifold 45 and a fourth liquid manifold 46. The first liquid manifold 43 is connected to the second end of the first liquid manifold 411 and the first end of the second liquid manifold 412. The third liquid manifold 45 is connected to the second end of the second liquid manifold 412 and the first indoor unit 11. The fourth liquid manifold 46 is connected to the third end of the second liquid manifold 412 and the third indoor unit 13. The gas manifold 31 also includes a second gas manifold 312, and the gas pipe assembly 30 also includes a third gas manifold 35 and a fourth gas manifold 36. The first gas manifold 33 is connected to the second end of the first gas manifold 311 and the first end of the second gas manifold 312. The third gas manifold 35 is connected to the second end of the second gas manifold 312 and the first indoor unit 11. The fourth gas manifold 36 is connected to the third end of the second gas manifold 312 and the third indoor unit 13.

[0067] Furthermore, at least one of the third liquid manifold 45, the fourth liquid manifold 46, the third gas manifold 35, and the fourth gas manifold 36 is made of steel. It is understood that by using at least one of the third liquid manifold 45, the fourth liquid manifold 46, the third gas manifold 35, and the fourth gas manifold 36 as a steel pipe, its manufacturing cost is significantly reduced compared to the cost of copper pipes in related technologies, and steel pipes can essentially replace copper pipes, thereby effectively reducing the manufacturing cost of the HVAC equipment 1.

[0068] Please see Figure 5Furthermore, in some embodiments, the indoor unit 10 further includes a fourth indoor unit 14, the liquid branch pipe 41 further includes a third liquid branch pipe 413, and the gas pipe assembly 30 further includes a fifth liquid branch pipe 47 and a sixth liquid branch pipe 48. That is, the second liquid branch pipe 44 is connected to the third end of the first liquid branch pipe 411 and the first end of the third liquid branch pipe 413, the fifth liquid branch pipe 47 is connected to the second end of the third liquid branch pipe 413 and the second indoor unit 12, and the sixth liquid branch pipe 48 is connected to the third end of the third liquid branch pipe 413 and the fourth indoor unit 14. The gas branch pipe 31 also includes a third gas branch pipe 313, and the gas pipe assembly 30 also includes a fifth gas branch pipe 37 and a sixth gas branch pipe 38. That is, the second gas branch pipe 34 is connected to the third end of the first gas branch pipe 311 and the first end of the third gas branch pipe 313, the fifth gas branch pipe 37 is connected to the second end of the third gas branch pipe 313 and the second indoor unit 12, and the sixth gas branch pipe 38 is connected to the third end of the third gas branch pipe 313 and the fourth indoor unit 14. Thus, the second indoor unit 12 and the fourth indoor unit 14 are connected through the fifth liquid branch pipe 47, the sixth liquid branch pipe 48, the fifth gas branch pipe 37 and the sixth gas branch pipe 38.

[0069] Among them, at least one of the fifth liquid manifold 47, the sixth liquid manifold 48, the fifth gas manifold 37, and the sixth gas manifold 38 is a steel pipe. It is understood that the manufacturing material of the fifth liquid manifold 47, the sixth liquid manifold 48, the fifth gas manifold 37, and the sixth gas manifold 38 can all be steel pipes, and at least one of the fifth liquid manifold 47, the sixth liquid manifold 48, the fifth gas manifold 37, and the sixth gas manifold 38 is also made of steel pipes. Moreover, the manufacturing cost of steel pipes is lower than that of copper pipes used in the prior art, so as to save on the cost of materials used, thereby effectively reducing the manufacturing cost of HVAC equipment 1.

[0070] Please see Figure 6 In some embodiments, when the number of outdoor units 20 is multiple, that is, there can be two or three outdoor units 20, this application embodiment does not specifically limit this. For example Figure 6 As shown, the outdoor unit 20 includes a first outdoor unit 21 and a second outdoor unit 22.

[0071] The liquid pipe assembly 40 includes a liquid manifold 49, which connects multiple outdoor units 20 and multiple indoor units 10. The liquid manifold 49 is used to collect the liquid working fluid from the multiple outdoor units 20 and deliver it to the multiple indoor units 10. The gas pipe assembly 30 includes a gas distribution pipe 39, which connects multiple outdoor units 20 and multiple indoor units 10. The gas distribution pipe 39 is used to distribute the gas working fluid from the multiple indoor units 10 to the multiple outdoor units 20, thereby realizing refrigerant circulation between the multiple outdoor units 20 and the multiple indoor units 10.

[0072] Furthermore, at least one of the liquid manifold 49 and the gas splitter 39 is made of steel. It is understood that the liquid manifold 49 is made of steel, or the gas splitter 39 is made of steel, or both the liquid manifold 49 and the gas splitter 39 are made of steel, thus reducing the manufacturing cost of at least one of the liquid manifold 49 and the gas splitter 39.

[0073] Please see Figure 7 Since both the gas pipe assembly 30 and the liquid pipe assembly 40 can be made of steel pipes, in some embodiments, at least one of the liquid branch pipe 41 and the gas branch pipe 31 includes a tee steel pipe 50, two branch pipe joints 60 and a main pipe joint 70.

[0074] Specifically, the two branch pipe joints 60 are connected to the tee pipe 50 respectively, and the main pipe joint 70 is sleeved with the tee pipe 50. It can be understood that, taking the liquid branch pipe 41 as an example, the liquid from the outdoor unit 20 flows from the main pipe joint 70 through filtration into the tee pipe 50, then into the two branch pipe joints 60, and finally into the indoor unit 10 connected to the branch pipe joint 60, thus achieving refrigerant distribution. The branch pipe joint 60 includes a first steel section 61, a second steel section 62, and a third steel section 63 connected in sequence. The first steel section 61 is connected to the tee pipe 50 to allow the liquid from the outdoor unit 20 to flow from the tee pipe 50 to the first steel section 61; furthermore, the pipe diameters of the first steel section 61, the second steel section 62, and the third steel section 63 decrease sequentially. It is understandable that the diameter of the first steel section 61 is the largest compared to the diameter of the second steel section 62 and the third steel section 63. In this way, the appropriate steel section can be selected according to the diameter of the liquid pipe assembly 40 and the gas pipe assembly 30 to improve the versatility of the liquid manifold 41 and the gas manifold 31.

[0075] It should be noted that the tee steel pipe 50 may include at least two pipe sections with different diameters, and the outer diameter ratio of two adjacent pipe sections of the tee steel pipe 50 is Q, 0.85≤Q≤1.15. By using steel material, the tee steel pipe 50 can be processed to produce the required specifications of the branch pipe joint 60 and the main pipe joint 70, and the pipe diameters of the branch pipe joint 60 and the main pipe joint 70 meet the above range, so that the branch pipe joint 60 and the main pipe joint 70 have good docking stability with other steel pipes 95.

[0076] Please continue reading. Figure 7 Furthermore, in some embodiments, at least one of the liquid manifold 41 and the gas manifold 31 further includes a steel connecting sleeve 80, one end of which passes through the main pipe joint 70, and the other end of which is sleeved with other steel pipes 95 in the gas pipe assembly 30 and the liquid pipe assembly 40. It is understood that the steel connecting sleeve 80 is used to connect the main pipe joint 70 to the other steel pipes 95 in the gas pipe assembly 30 and the liquid pipe assembly 40, and the use of the steel connecting sleeve 80 can reduce the manufacturing cost of the liquid manifold 41 and the gas manifold 31.

[0077] Furthermore, in some embodiments, at least one of the liquid manifold 41 and the gas manifold 31 further includes at least one extension pipe, each extension pipe being connected to at least one of the main pipe connector 70 and the two branch pipe connectors 60. For example, there are three extension pipes, one of which is connected to the main pipe connector 70, and the remaining two extension pipes are connected to the two branch pipe connectors 60 respectively. Moreover, the extension pipes can be overlapped with the main pipe connector 70 and the branch pipe connectors 60 by welding, so that the main pipe connector 70 and the branch pipe connector 60 can respectively mate with the corresponding extension pipes, facilitating assembly.

[0078] The length of the overlapping portion of the extension tube with the corresponding main pipe joint 70 and branch pipe joint 60 is L1, where 5mm≤L1≤20mm. Within this insertion depth, the connection of the plug-in structure can be made stable by welding.

[0079] In some embodiments, the two branch pipe joints 60 have an end center distance R1, where R1 satisfies: 30mm ≤ R1 ≤ 100mm. The end center distance R1 can be understood as the axial vertical distance between the two branch pipe joints 60, or the axial vertical distance between the opening of one branch pipe joint 60 on the side away from the tee pipe 50 and the opening of the extension pipe on the side away from the tee pipe 50. When R1 satisfies 30mm ≤ R1 ≤ 100mm, the spacing between the two branch pipe joints 60 is appropriate, facilitating the forming of the liquid branch pipe 41 and the gas branch pipe 31, resulting in a stable structure that is not easily deformed, and effectively improving flow resistance.

[0080] In addition, both the liquid manifold 41 and the gas manifold 31 of this application are made of steel pipes, which allows for thinner pipe wall designs. Optionally, the wall thickness of the branch connector 60 is h, where h satisfies: 1.0mm≤h≤2mm. Within this wall thickness range, R1 is set to satisfy: 30mm≤R1≤100mm, which allows the branch connector 60 to have a larger pipe diameter, thereby effectively reducing flow resistance.

[0081] Please see Figure 8 In other embodiments, the gas tubing assembly 30 and the liquid tubing assembly 40 include steel tubing, and at least one of the liquid manifold 41 and the gas manifold 31 includes a tee steel pipe 50, two first copper sleeves 90 and two second copper sleeves 91. It is understood that the tee pipe 50 includes a main pipe section 51 and two branch pipe sections 52. The main pipe section 51 and the two branch pipe sections 52 are respectively connected to the gas pipe assembly 30 or the liquid pipe assembly 40. The two first copper sleeves 90 are respectively connected to the two branch pipe sections 52. The first copper sleeve 90 includes a tapered section 902 and a connecting section 901. The connecting section 901 is connected to the corresponding branch pipe section 52, and the tapered section 902 is connected to the corresponding gas pipe assembly 30 or the liquid pipe assembly 40. One end of each second copper sleeve 91 is correspondingly inserted into a tapered section 902, and the other end of each second copper sleeve 91 is sleeved with other steel pipes 95 in the gas pipe assembly 30 and the liquid pipe assembly 40. In this way, the connecting section 901 is connected and connected to the tee pipe 50, and the second copper sleeve 91 is connected and connected to other steel pipes 95 in the gas pipe assembly 30 and the liquid pipe assembly 40, so that the gas working medium can flow through the gas branch pipe 31 or the liquid working medium can flow through the liquid branch pipe 41.

[0082] In some embodiments, the tapered section 902 includes at least two copper sections, the diameter of which decreases sequentially in the direction away from the branch section 52, and each copper section in the tapered section 902 corresponds to another steel pipe 95 in the gas pipe assembly 30 or liquid pipe assembly 40 of a certain size, so that the corresponding gas pipe assembly 30 or other steel pipe 95 in the liquid pipe assembly 40 can be connected to the corresponding copper section.

[0083] It should be noted that the embodiments of this application do not specifically limit the number of copper segments.

[0084] For example, when there are two copper segments, the tapering section 902 may include a first copper segment and a second copper segment. The diameter of the first copper segment is larger than the diameter of the second copper segment, and the first copper segment is connected to the connecting section 901. That is, the diameters of the first copper segment and the second copper segment gradually decrease in the direction away from the connecting section 901, and the first copper segment or the second copper segment is connected to other steel pipes 95 in the gas pipe assembly 30 or liquid pipe assembly 40 of the corresponding size and specification. That is, when the gas pipe assembly 30 or liquid pipe assembly 40 When the diameter of the other steel pipes 95 in the gas pipe assembly 30 or liquid pipe assembly 40 is suitable for the diameter of the second copper section, the other steel pipes 95 in the gas pipe assembly 30 or liquid pipe assembly 40 can be directly sleeved on the second copper section; when the diameter of the other steel pipes 95 in the gas pipe assembly 30 or liquid pipe assembly 40 is suitable for the diameter of the first copper section, the other steel pipes 95 in the gas pipe assembly 30 or liquid pipe assembly 40 can be sleeved on the first copper section by cutting the second copper section, thereby improving the versatility of the liquid manifold 41 and the gas manifold 31.

[0085] For example, when there are three copper segments, the tapering section 902 may include a first copper segment, a second copper segment, and a third copper segment. The diameters of the first copper segment, the second copper segment, and the third copper segment decrease sequentially in the direction away from the branch pipe section 52. The first copper segment is connected to the connecting section 901, and the first copper segment, the second copper segment, or the third copper segment is connected to other steel pipes 95 in the gas pipe assembly 30 and the liquid pipe assembly 40 of the corresponding size and specifications. That is, as the distance from the tee pipe 50 increases, the diameters of the first copper segment, the second copper segment, and the third copper segment gradually decrease, so that the other steel pipes 95 in the gas pipe assembly 30 and the liquid pipe assembly 40 can be connected to the corresponding copper segments. Understandably, when the diameter of the other steel pipes 95 in the gas pipe assembly 30 and liquid pipe assembly 40 is suitable for the first copper segment, the other steel pipes 95 in the gas pipe assembly 30 or liquid pipe assembly 40 can be fitted onto the first copper segment by cutting the second and third copper segments; when the diameter of the other steel pipes 95 in the gas pipe assembly 30 and liquid pipe assembly 40 is suitable for the second copper segment, the other steel pipes 95 in the gas pipe assembly 30 or liquid pipe assembly 40 can be fitted onto the second copper segment by cutting the third copper segment; when the diameter of the other steel pipes 95 in the gas pipe assembly 30 and liquid pipe assembly 40 is suitable for the third copper segment, the other steel pipes 95 in the gas pipe assembly 30 or liquid pipe assembly 40 can be directly fitted onto the third copper segment. In this way, the versatility of the liquid manifold 41 and the gas manifold 31 is improved, and they can be adapted to liquid pipe assemblies 40 and gas pipe assemblies 30 with different pipe diameters, which helps to reduce the mold opening cost in the manufacturing process.

[0086] For example, when there are four copper segments, the tapering section 902 may include a first copper segment, a second copper segment, a third copper segment, and a fourth copper segment. The diameters of the first copper segment, the second copper segment, the third copper segment, and the fourth copper segment decrease sequentially in the direction away from the branch pipe section 52. The first copper segment is connected to the connecting section 901, and the first copper segment, the second copper segment, the third copper segment, or the fourth copper segment is connected to other steel pipes 95 in the gas pipe assembly 30 and the liquid pipe assembly 40 of the corresponding size and specifications. That is, as the distance from the tee pipe 50 increases, the diameters of the first copper segment, the second copper segment, the third copper segment, and the fourth copper segment gradually decrease, so that the other steel pipes 95 in the gas pipe assembly 30 and the liquid pipe assembly 40 can be connected to the corresponding copper segments. Understandably, when the diameter of the other steel pipes 95 in the gas tubing assembly 30 and the liquid tubing assembly 40 is suitable for the first copper segment, the other steel pipes 95 in the gas tubing assembly 30 or the liquid tubing assembly 40 can be fitted onto the first copper segment by cutting the second, third, and fourth copper segments; when the diameter of the other steel pipes 95 in the gas tubing assembly 30 and the liquid tubing assembly 40 is suitable for the second copper segment, the other steel pipes 95 in the gas tubing assembly 30 or the liquid tubing assembly 40 can be fitted onto the second copper segment by cutting the third ...; when the diameter of the other steel pipes 95 in the gas tubing assembly 30 and the liquid tubing assembly 40 is suitable for the second copper segment, the other steel pipes 95 in the gas tubing assembly 30 or the liquid tubing assembly 40 can be fitted onto the second copper segment. When the diameter of pipe 95 is suitable for the third copper segment, the fourth copper segment can be cut to allow other steel pipes 95 in the gas pipe assembly 30 or liquid pipe assembly 40 to be fitted onto the third copper segment. When the diameter of pipes 95 in the gas pipe assembly 30 and liquid pipe assembly 40 is suitable for the fourth copper segment, the other steel pipes 95 in the gas pipe assembly 30 or liquid pipe assembly 40 can be directly fitted onto the fourth copper segment. This improves the versatility of the liquid manifold 41 and the gas manifold 31, allowing them to be adapted to liquid pipe assemblies 40 and other steel pipes 95 in gas pipe assemblies 30 with different diameters, which helps reduce mold opening costs in the manufacturing process.

[0087] Please continue reading. Figure 8 Furthermore, in some embodiments, at least one of the liquid manifold 41 and the gas manifold 31 includes a third copper sleeve 92 and a fourth copper sleeve 93. The third copper sleeve 92 is sleeved with the main pipe section 51, one end of the fourth copper sleeve 93 is correspondingly inserted through the third copper sleeve 92, and the other end of the fourth copper sleeve 93 is sleeved with other steel pipes 95 in the gas pipe assembly 30 and the liquid pipe assembly 40. It can be understood that by providing the third copper sleeve 92 and the fourth copper sleeve 93, the stability of the connection between the tee steel pipe 50 and the other steel pipes 95 in the gas pipe assembly 30 and the liquid pipe assembly 40 can be improved. Moreover, the third copper sleeve 92 and the fourth copper sleeve 93 are made of copper, which makes it easy to form the third copper sleeve 92 and the fourth copper sleeve 93.

[0088] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0089] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A heating, ventilation, and air conditioning (HVAC) device, characterized in that, The heating, ventilation, and air conditioning equipment includes: At least one indoor unit; At least one outdoor unit; A duct assembly, connecting the indoor unit and the outdoor unit; and, A liquid pipe assembly is connected between the indoor unit and the outdoor unit so that the indoor unit and the outdoor unit form a refrigerant circulation through the gas pipe assembly and the liquid pipe assembly; Wherein, at least a portion of the tubing of the endotracheal assembly is made of steel, and / or, at least a portion of the tubing of the liquid tubing assembly is made of steel.

2. The HVAC equipment as described in claim 1, characterized in that, The number of indoor units is multiple. The liquid piping assembly includes a liquid manifold that connects multiple indoor units and an outdoor unit, and is used to divert the liquid working fluid of the outdoor unit to multiple indoor units. The gas pipe assembly includes a gas branch pipe, which connects multiple indoor units and the outdoor unit, and is used to combine the working gas of the multiple indoor units to the outdoor unit. Wherein, the gas manifold and / or the liquid manifold are steel pipes.

3. The HVAC equipment as described in claim 2, characterized in that, The outdoor unit includes a first outdoor unit, and the indoor unit includes a first indoor unit and a second indoor unit; The liquid manifold includes a first liquid manifold, and the liquid pipe assembly also includes a liquid main pipe, a first liquid branch pipe, and a second liquid branch pipe. The liquid main pipe connects the outdoor unit to a first end of the first liquid manifold, the first liquid branch pipe connects the first indoor unit to a second end of the first liquid manifold, and the second liquid branch pipe connects the second indoor unit to a third end of the first liquid manifold. The gas branch pipe includes a first gas branch pipe, and the gas pipe assembly also includes a gas main pipe, a first gas branch pipe and a second gas branch pipe. The gas main pipe connects the first outdoor unit to the first end of the first gas branch pipe, the first gas branch pipe connects the first indoor unit to the second end of the first gas branch pipe, and the second gas branch pipe connects the second indoor unit to the third end of the first gas branch pipe. Wherein, at least one of the liquid main pipe, the first liquid branch pipe, the second liquid branch pipe, the gas main pipe, the first gas branch pipe, and the second gas branch pipe is a steel pipe.

4. The HVAC equipment as described in claim 3, characterized in that, The indoor unit also includes a third indoor unit; The liquid manifold also includes a second liquid manifold, and the liquid pipe assembly also includes a third liquid manifold and a fourth liquid manifold. The first liquid manifold is connected to the second end of the first liquid manifold and the first end of the second liquid manifold. The third liquid manifold is connected to the second end of the second liquid manifold and the first indoor unit. The fourth liquid manifold is connected to the third end of the second liquid manifold and the third indoor unit. The gas branch pipe also includes a second gas branch pipe, and the gas pipe assembly also includes a third gas branch pipe and a fourth gas branch pipe. The first gas branch pipe is connected to the second end of the first gas branch pipe and the first end of the second gas branch pipe. The third gas branch pipe is connected to the second end of the second gas branch pipe and the first indoor unit. The fourth gas branch pipe is connected to the third end of the second gas branch pipe and the third indoor unit. Wherein, at least one of the third liquid manifold, the fourth liquid manifold, the third gas manifold, and the fourth gas manifold is a steel pipe.

5. The HVAC equipment as described in claim 4, characterized in that, The indoor unit also includes a fourth indoor unit; The liquid manifold also includes a third liquid manifold, and the gas pipe assembly also includes a fifth liquid manifold and a sixth liquid manifold. The second liquid manifold is connected to the third end of the first liquid manifold and the first end of the third liquid manifold. The fifth liquid manifold is connected to the second end of the third liquid manifold and the second indoor unit. The sixth liquid manifold is connected to the third end of the third liquid manifold and the fourth indoor unit. The gas branch pipe also includes a third gas branch pipe, and the gas pipe assembly also includes a fifth gas branch pipe and a sixth gas branch pipe. The second gas branch pipe is connected to the third end of the first gas branch pipe and the first end of the third gas branch pipe. The fifth gas branch pipe is connected to the second end of the third gas branch pipe and the second indoor unit. The sixth gas branch pipe is connected to the third end of the third gas branch pipe and the fourth indoor unit. Among them, at least one of the fifth liquid manifold, the sixth liquid manifold, the fifth gas manifold, and the sixth gas manifold is a steel pipe.

6. The HVAC equipment as described in claim 2, characterized in that, There are multiple outdoor units. The liquid pipe assembly includes a liquid manifold that connects multiple outdoor units and multiple indoor units, and is used to collect the liquid working fluid from the multiple outdoor units and deliver it to the multiple indoor units. The gas pipe assembly includes a gas splitter pipe that connects multiple outdoor units and multiple indoor units, and is used to split the gas working fluid of the multiple indoor units to the multiple outdoor units. The liquid manifold and / or the gas splitter are made of steel.

7. The HVAC equipment as described in claim 2, characterized in that, Both the gas tubing assembly and the liquid tubing assembly are made of steel pipe, and at least one of the liquid manifold and the gas manifold includes: T-shaped steel pipe; Two branch pipe fittings are respectively connected to the tee pipe. Each branch pipe fitting includes a first steel section, a second steel section, and a third steel section connected in sequence. The first steel section is connected to the tee pipe, and the diameters of the first steel section, the second steel section, and the third steel section decrease sequentially. The main pipe connector is sleeved with the tee steel pipe.

8. The HVAC equipment as described in claim 7, characterized in that, The two pipe connectors have an end center distance R1, which satisfies: 30mm≤R1≤100mm.

9. The HVAC equipment as described in claim 7, characterized in that, The tee pipe includes at least two pipe sections with different diameters, and the ratio of the outer diameters of two adjacent pipe sections of the tee pipe is Q, where 0.85≤Q≤1.

15.

10. The HVAC equipment as described in claim 7, characterized in that, At least one of the liquid manifold and the gas manifold further includes: A steel connecting sleeve is inserted at one end into the main pipe joint, and at the other end is connected to other steel pipes in the gas pipe assembly and the liquid pipe assembly.

11. The HVAC equipment as described in claim 7, characterized in that, At least one of the liquid manifold and the gas manifold further includes: At least one extension tube, each of the extension tubes being connected to the main pipe joint and one of the two branch pipe joints, and the extension tubes being overlapped with the main pipe joint and / or the branch pipe joints; Wherein, the length of the overlapping portion of the extension pipe with the corresponding main pipe joint and / or branch pipe joint is L1, where 5mm≤L1≤20mm.

12. The HVAC equipment as described in claim 2, characterized in that, The gas tubing assembly and the liquid tubing assembly both comprise steel tubing, and at least one of the liquid manifold and the gas manifold includes: The tee pipe includes a main pipe section and two branch pipe sections, wherein the main pipe section and the two branch pipe sections are respectively connected to other steel pipes in the gas pipe assembly or the liquid pipe assembly; Two first copper sleeves are respectively connected to two of the said branch pipe sections. Each first copper sleeve includes a tapering section and a connecting section. Each connecting section is connected to a corresponding branch pipe section. The tapering section is connected to another steel pipe in the corresponding gas pipe assembly or liquid pipe assembly. Two second copper sleeves, one end of each second copper sleeve is inserted through a tapered section, and the other end of each second copper sleeve is sleeved with other steel pipes in the gas pipe assembly and the liquid pipe assembly.

13. The HVAC equipment as described in claim 12, characterized in that, The tapering section includes at least two copper sections, the diameter of which decreases sequentially away from the branch pipe section. Each copper section in the tapering section corresponds to a different size of the gas pipe assembly or other steel pipe in the liquid pipe assembly.

14. The HVAC equipment as described in claim 13, characterized in that, The tapering section includes a first copper section and a second copper section. The diameter of the first copper section is larger than that of the second copper section. The first copper section is connected to the connecting section. The first copper section or the second copper section is connected to other steel pipes in the gas pipe assembly or the liquid pipe assembly of the corresponding size and specifications.

15. The HVAC equipment as described in claim 13, characterized in that, The tapering section includes a first copper section, a second copper section, and a third copper section. The diameters of the first copper section, the second copper section, and the third copper section decrease sequentially in the direction away from the branch pipe section. The first copper section is connected to the connecting section. The first copper section, the second copper section, or the third copper section is connected to other steel pipes in the gas pipe assembly or the liquid pipe assembly of the corresponding size and specifications.

16. The HVAC equipment as described in claim 13, characterized in that, The tapering section includes a first copper section, a second copper section, a third copper section, and a fourth copper section. The diameters of the first copper section, the second copper section, the third copper section, and the fourth copper section decrease sequentially in the direction away from the branch pipe section. The first copper section is connected to the connecting section. The first copper section, the second copper section, the third copper section, or the fourth copper section is connected to other steel pipes in the gas pipe assembly or the liquid pipe assembly of the corresponding size and specifications.

17. The HVAC equipment as described in claim 12, characterized in that, At least one of the liquid manifold and the gas manifold further includes: The third copper sleeve is fitted into the main pipe section; and... The fourth copper sleeve has one end inserted into the third copper sleeve, and the other end connected to the other steel pipes in the gas pipe assembly and the liquid pipe assembly.

18. The HVAC equipment as described in claim 2, characterized in that, The liquid manifold and the gas manifold are made of the same material and comprise the following components by mass fraction: C 0%–0.02%, Si 0.5%–1%, Mn 1%–2%, Cr 16%–18%, Ni 9%–11%, Cu 2%–4%, Mo 0%–0.02%, P 0%–0.03%, S 0%–0.03%, with the balance being Fe and impurity elements, the total mass percentage of which is less than or equal to 0.2%.

19. The HVAC equipment as described in claim 13, characterized in that, Both the liquid manifold and the gas manifold satisfy at least one of the following conditions: (1) The resistance strength of the liquid manifold and the gas manifold is A, and A satisfies: 400MPa≤A≤600MPa; (2) The yield strength of the liquid manifold and the gas manifold is B, and B satisfies: 140MPa≤B≤180MPa; (3) The yield strength ratio of the liquid manifold and the gas manifold is C, where C satisfies: 0.23≤B≤0.45; (4) The elongation of the liquid manifold and the gas manifold is D, and D satisfies: 50% ≤ D ≤ 80%; (5) The hardness of the liquid manifold and the gas manifold is E, and E satisfies: 100Hv≤E≤120Hv; (6) The MD30 values ​​of the liquid manifold and the gas manifold satisfy: -50℃≤MD30≤-80℃.

20. The HVAC equipment as described in claims 1-19, characterized in that, The outdoor unit includes a compressor, a four-way valve, an outdoor heat exchanger, a gas-liquid separator, an outdoor liquid-side connector, and an outdoor gas-side connector. The indoor unit includes an indoor heat exchanger, and indoor gas-side connectors and indoor liquid-side connectors located on both sides of the indoor heat exchanger. The air pipe assembly is connected between the outdoor air-side connector and the indoor air-side connector; The liquid pipe assembly is connected between the outdoor liquid-side connector and the indoor liquid-side connector.

21. The HVAC equipment as described in claim 20, characterized in that, The number of indoor units is multiple; The liquid piping assembly includes a liquid manifold that connects multiple indoor units and an outdoor unit, and is used to divert the liquid working fluid of the outdoor unit to multiple indoor units. The gas pipe assembly includes a gas branch pipe, which connects multiple indoor units and the outdoor unit, and is used to combine the working gas of the multiple indoor units to the outdoor unit. Wherein, the portion of the liquid pipe assembly between the liquid manifold and the outdoor liquid-side connector is made of steel pipe and / or the portion of the gas pipe assembly between the gas manifold and the outdoor gas-side connector is made of steel pipe, and the gas manifold and / or the liquid manifold are made of steel pipe.

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