Compressor assembly and heat source unit having same

Abstract

Disclosed in the present application are a compressor assembly (1000) and a heat source unit having same. The compressor assembly comprises a compressor (200), wherein the compressor (200) is provided with a discharge port (201), a suction port (202), a discharge pipe assembly and a suction pipe assembly, one end of the discharge pipe assembly being in communication with the discharge port (201) of the compressor (200), and one end of the suction pipe assembly being in communication with the suction port (202) of the compressor (200); at least one of the discharge pipe assembly and the suction pipe assembly is a stainless steel pipe made of flexible stainless steel, the material composition of the flexible stainless steel at least including Cu.

Description

A compressor assembly and a heat source unit having therein.

[0001] Cross-reference to related applications

[0002] This application is based on and claims priority to Chinese patent applications filed on August 27, 2024, with application numbers 202411186726.9, 202411189745.7, 202411191023.5, 202422099070.9, 202422099054.X, and 202422099081.7, and filed on September 10, 2024, with application numbers 202411266931.6 and 202422226187.9, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of heating, ventilation and air conditioning (HVAC) technology, and in particular to a compressor assembly and a heat source unit having therein. Background Technology

[0004] In related technologies, the heat source unit often contains a compressor and pipelines connected to the compressor. The pipelines are relatively complex, with many welding connections required. Furthermore, the structural strength and spatial arrangement of the pipelines need further improvement.

[0005] Application content

[0006] This application aims to address at least one of the technical problems existing in the prior art. To this end, one objective of this application is to provide a compressor assembly with fewer welding points, high structural strength, and optimized spatial arrangement.

[0007] According to the compressor assembly exemplified in the first aspect of this application, the compressor includes: a compressor having an exhaust port, an exhaust pipe assembly, and an intake pipe assembly, one end of the exhaust pipe assembly communicating with the exhaust port of the compressor, and one end of the intake pipe assembly communicating with the intake port of the compressor, wherein at least one of the exhaust pipe assembly and the intake pipe assembly is a stainless steel pipe made of flexible stainless steel, and the material composition of the flexible stainless steel includes at least Cu.

[0008] According to the compressor assembly of this application, by making the exhaust pipe or the first suction pipe a flexible stainless steel pipe, the exhaust pipe or the first suction pipe can be bent and extended more effectively, thus saving space and optimizing the arrangement of the heat source unit. Furthermore, since the exhaust pipe or the first suction pipe retains good mechanical strength and pressure resistance after bending, it can stably transport the refrigerant medium, which is beneficial to the stability of the compressor and the heat source unit's operation.

[0009] According to one example of this application, the flexible stainless steel comprises at least copper and nickel, wherein the mass percentages of copper and nickel are: Ni: 9-11% and Cu: 2-4%.

[0010] According to one example of this application, the exhaust pipe assembly is a stainless steel pipe made of the flexible stainless steel, the exhaust pipe having multiple bends, and / or, the intake pipe assembly is a stainless steel pipe made of the flexible stainless steel, the first intake pipe having multiple bends.

[0011] According to one example of this application, it also includes: a four-way valve assembly, the four-way valve assembly including a four-way valve, a shut-off valve and a first pipe structure, the first pipe structure connecting the four-way valve and the shut-off valve, at least a portion of the first pipe structure being a flexible stainless steel integrally formed stainless steel part.

[0012] According to one example of this application, the first pipe structure includes a filter, and the piping between the filter and the shut-off valve is a first piping, which is the flexible stainless steel integrally formed stainless steel pipe.

[0013] According to one example of this application, the shut-off valve includes a shut-off valve tube, which is a stainless steel tube integrally formed from the flexible stainless steel, and the shut-off valve tube is welded to the first piping.

[0014] According to one example of this application, the first pipe structure includes a filter, and the piping between the four-way valve and the filter is a second piping, which is the flexible stainless steel integrally formed stainless steel pipe.

[0015] According to one example of this application, the four-way valve includes a valve connector, which is a stainless steel pipe integrally formed from the flexible stainless steel, and the valve connector is welded to the second piping.

[0016] According to one example of this application, the valve connector of the four-way valve is welded with a sleeve, which is a copper sleeve or a copper alloy sleeve.

[0017] According to one example of this application, the first pipe structure has a sleeve welded to the end of the pipe facing the four-way valve, and the sleeve is a copper pipe or a copper alloy pipe.

[0018] According to one example of this application, the first pipe structure is welded with a sleeve facing the port of the shut-off valve, the sleeve being a copper pipe or a copper alloy pipe.

[0019] According to one example of this application, the valve port of the shut-off valve is welded with a sleeve, which is a copper pipe or a copper alloy pipe.

[0020] According to an example of this application, the first pipe structure includes a filter and a first pipe and a second pipe connected to both ends of the filter. The first pipe and the second pipe are both stainless steel pipes integrally formed from the flexible stainless steel. The first pipe has at least one bent section with a bending radius of r. The outer diameter d of the first pipe or the second pipe satisfies: 1.2d≤r≤1.5d.

[0021] According to one example of this application, the four-way valve includes a valve connector, wherein the valve connector and the first pipe structure are integrally formed from the flexible stainless steel.

[0022] According to one example of this application, the shut-off valve includes a shut-off valve tube, and the shut-off valve tube and the first tube are integrally formed from the flexible stainless steel.

[0023] According to one example of this application, a valve unit is also included, the valve unit comprising: a main body pipe; at least one first valve connector, the first valve connector comprising a first connecting pipe and a second connecting pipe, the first connecting pipe being located between the main body pipe and the second connecting pipe, the second connecting pipe being connected to an external piping, wherein the second connecting pipe is a bent pipe, and the first connecting pipe and the second connecting pipe are integrally formed flexible stainless steel pipes, the flexible stainless steel comprising at least copper.

[0024] According to an example of this application, the outer diameter of the bent tube is d, and the bending radius of the bent tube is r, satisfying: 1.2d≤r≤1.5d.

[0025] According to an example of this application, the second connecting pipe includes a first straight pipe section, a bent section, and a second straight pipe section connected in sequence. The first straight pipe section and the second straight pipe section are arranged in parallel. The bending radius of the bent section is r. The outer diameter d of the first straight pipe section or the second straight pipe section satisfies: 1.2d≤r≤1.5d.

[0026] According to one example of this application, the main tube is a stainless steel tube integrally formed from the flexible stainless steel.

[0027] According to one example of this application, the main tube and the first valve connector are integrally formed stainless steel parts made of the flexible stainless steel.

[0028] According to one example of this application, the first connecting pipe is a straight pipe.

[0029] According to one example of this application, the valve unit further includes at least one second valve connector, the second valve connector including a third connecting pipe and a fourth connecting pipe, the third connecting pipe being located between the main pipe and the fourth connecting pipe, the fourth connecting pipe being connected to an external piping, wherein the fourth connecting pipe is a straight pipe, and the third connecting pipe and the fourth connecting pipe are integrally formed stainless steel pipes of the flexible stainless steel.

[0030] According to one example of this application, the third connecting pipe is a straight pipe.

[0031] According to one example of this application, the second connecting pipe has a first retractable portion at its end away from the first connecting pipe, the outer diameter of the first retractable portion being smaller than the outer diameter of the first connecting pipe; or, the second connecting pipe has a first expanding portion at its end away from the first connecting pipe, the outer diameter of the first expanding portion being larger than the outer diameter of the first connecting pipe; and / or, the fourth connecting pipe has a second retractable portion at its end away from the third connecting pipe, the outer diameter of the second retractable portion being smaller than the outer diameter of the third connecting pipe; or, the fourth connecting pipe has a second expanding portion at its end away from the third connecting pipe, the outer diameter of the second expanding portion being larger than the outer diameter of the third connecting pipe.

[0032] According to one example of this application, in the direction from the first connecting pipe to the second connecting pipe, the outer diameter of the first retracted portion gradually decreases, or the outer diameter of the first expanded portion gradually increases; and / or, in the direction from the third connecting pipe to the fourth connecting pipe, the outer diameter of the second retracted portion gradually decreases, or the outer diameter of the second expanded portion gradually increases.

[0033] According to an example of this application, the valve unit is a four-way valve, the valve unit including a first valve tube, a second valve tube, a third valve tube and a fourth valve tube, wherein at least one of the first valve tube, the second valve tube, the third valve tube and the fourth valve tube is the first valve connecting pipe, or at least one of the first valve tube, the second valve tube, the third valve tube and the fourth valve tube is the second valve connecting pipe, or a portion of the first valve tube, the second valve tube, the third valve tube and the fourth valve tube is the first valve connecting pipe and the remainder is the second valve connecting pipe.

[0034] According to one example of this application, the exhaust pipe assembly includes a second exhaust pipe, the intake pipe assembly includes a first intake pipe, the first valve pipe is connected to the exhaust pipe, the second valve pipe is connected to the first intake pipe, the third valve pipe is connected to a first outlet pipe, and the fourth valve pipe is connected to a second outlet pipe, wherein at least one of the first valve pipe, the second valve pipe, the third valve pipe and the fourth valve pipe is a stainless steel pipe made of the flexible stainless steel.

[0035] According to one example of this application, the second exhaust pipe and the first valve pipe are both integrally formed flexible stainless steel pipes, and the second exhaust pipe and the first valve pipe are welded together by a first solder; and / or, the first intake pipe and the second valve pipe are both integrally formed flexible stainless steel pipes, and the first intake pipe and the second valve pipe are welded together by a first solder; and / or, the first outlet pipe and the third valve pipe are both integrally formed flexible stainless steel pipes, and the first intake pipe and the third valve pipe are welded together by a first solder; and / or, the second outlet pipe and the fourth valve pipe are both integrally formed flexible stainless steel pipes, and the second outlet pipe and the fourth valve pipe are welded together by a first solder.

[0036] According to one example of this application, one of the second exhaust pipe and the first valve pipe is a flexible stainless steel pipe integrally formed, and the other is a copper pipe or a copper alloy pipe, and the exhaust pipe and the first valve pipe are welded together by a second solder; and / or, one of the first intake pipe and the second valve pipe is a flexible stainless steel pipe integrally formed, and the other is a copper pipe or a copper alloy pipe, and the first intake pipe and the second valve pipe are welded together by a second solder; and / or, one of the first outlet pipe and the third valve pipe is a flexible stainless steel pipe integrally formed, and the other is a copper pipe or a copper alloy pipe, and the first outlet pipe and the third valve pipe are welded together by a second solder; and / or, one of the second outlet pipe and the fourth valve pipe is a flexible stainless steel pipe integrally formed, and the other is a copper pipe or a copper alloy pipe, and the second outlet pipe and the fourth valve pipe are welded together by a second solder.

[0037] According to one example of this application, the suction tube assembly includes a first suction tube and a second suction tube, the second suction tube being connected between a gas-liquid separator and a four-way valve assembly, the first suction tube and / or the second suction tube having multiple bends, wherein the second suction tube is a flexible stainless steel tube integrally formed, the material composition of the flexible stainless steel including at least copper.

[0038] According to one example of this application, the first inhalation tube and / or the second inhalation tube includes a plurality of straight inhalation tubes, and the bend is connected between two adjacent straight inhalation tubes.

[0039] According to one example of this application, the bend is an arc.

[0040] According to one example of this application, the first intake tube includes a first intake pipe and a second intake pipe connected together. The first intake pipe includes a first intake straight pipe, a second intake straight pipe and an intake bend pipe. The intake bend pipe is connected between the first intake straight pipe and the second intake straight pipe. The end of the second intake straight pipe away from the intake bend pipe is connected to the second intake pipe.

[0041] According to one example of this application, the bend is provided between the second intake pipe and the first intake pipe.

[0042] According to an example of this application, the outer diameter of both the first and second straight intake pipes is d, and the bending radius of the intake bend pipe is r, satisfying 1.2d≤r≤1.5d.

[0043] According to one example of this application, the second inhalation tube includes multiple tube segments, with the bend connecting two adjacent tube segments. The multiple tube segments are a first inhalation tube segment, a second inhalation tube segment, a third inhalation tube segment, a fourth inhalation tube segment, and a fifth inhalation tube segment connected in sequence. The first inhalation tube segment, the third inhalation tube segment, and the fifth inhalation tube segment all extend along a first direction, while the second inhalation tube segment and the fifth inhalation tube segment extend along a second direction. The first direction and the second direction are perpendicular to each other.

[0044] According to one example of this application, an expansion tube is provided at one end of the first and / or the second inhalation tube, the diameter of which is larger than the diameter of the straight inhalation tube; and a retraction tube is provided at the other end of the first and / or the second inhalation tube, the diameter of which is smaller than the diameter of the straight inhalation tube; or, expansion tubes are provided at both ends of the first and / or the second inhalation tube, the diameter of which is larger than the diameter of the straight inhalation tube; or, retraction tubes are provided at both ends of the first and / or the second inhalation tube, the diameter of which is smaller than the diameter of the straight inhalation tube.

[0045] According to one example of this application, the expansion tube includes at least one sub-expansion tube, and when there are multiple sub-expansion tubes, the multiple sub-expansion tubes are connected in sequence, and the diameters of the multiple sub-expansion tubes increase in sequence in the direction from the bend to the intake straight tube; and / or, the retraction tube includes at least one sub-retraction tube, and when there are multiple sub-retraction tubes, the multiple sub-retraction tubes are connected in sequence, and the diameters of the multiple sub-retraction tubes decrease in sequence in the direction from the bend to the intake straight tube.

[0046] According to one example of this application, a limiting portion that cooperates with an external piping limit is provided at one end of the first inhalation tube and / or the second inhalation tube; or, limiting portions that cooperate with the external piping limit are provided at both ends of the first inhalation tube and / or the second inhalation tube.

[0047] According to one example of this application, the limiting portion is a convex hull or an annular protrusion extending around the axis of the intake tube.

[0048] According to one example of this application, the first suction pipe, the second suction pipe, and the external piping are all integrally formed stainless steel pipes of flexible stainless steel, and the first suction pipe or the second suction pipe and the external piping are welded together by a first solder.

[0049] According to one example of this application, one or both ends of the first or second suction pipe are connected to an external pipe. The first and second suction pipes are integrally formed stainless steel pipes of the flexible stainless steel, and the external pipes are copper pipes or copper alloy pipes. The first or second suction pipes and the external pipes are welded together by a second solder.

[0050] According to one example of this application, one or both ends of the first or second suction pipe are connected to external piping, one or both ends of the first or second suction pipe are provided with a first sleeve, one or both ends of the first or second suction pipe are provided with a second sleeve, and the first sleeve and the second sleeve are welded together by a third or fourth solder.

[0051] According to one example of this application, the yield strength of the flexible stainless steel is 140-180 MPa; and / or, the tensile strength of the flexible stainless steel is reduced to 400-600 MPa; and / or, the elongation of the flexible stainless steel is 50-80%; and / or, the yield strength ratio of the flexible stainless steel is less than 0.4; and / or, the hardness of the flexible stainless steel material is 90-120 Hv.

[0052] According to one example of this application, the flexible stainless steel is composed of the following components by weight percentage: C: less than 0.02%, Si: 0.5% to 1%, Mn: 1 to 2%, Cr: 16 to 18%, Ni: 9 to 11%, Cu: 2 to 4%, Mo: 0 to 0.02%, P: less than 0.03%, S: less than 0.03%, with the remainder consisting of Fe and unavoidable impurities.

[0053] According to one example of this application, the Md30 of the flexible stainless steel is -50℃ to -80℃.

[0054] According to one example of this application, the flexible stainless steel is austenitic stainless steel, and the average grain size of the flexible stainless steel is 20μm to 40μm.

[0055] According to one example of this application, the wall thickness of the stainless steel pipe is 1.2 mm to 1.5 mm.

[0056] According to an example of this application, the compressor assembly includes a first welded tube and a second welded tube welded together, both of which are made of the flexible stainless steel. The first welded tube and the second welded tube are welded together by a first solder, wherein the first solder contains, by weight, 46%–50% Cu, 9%–11% Ni, 0.04%–0.25% Si, with the remainder consisting of Zn and unavoidable impurities; the flux used with the first solder contains, by weight, 60%–80% boric acid, 5%–15% fluoride, and 10%–20% potassium borate; the melting temperature t1 when using the first solder satisfies: 910℃ ≤ t1 ≤ 935℃; and the brazing temperature t2 when using the first solder satisfies: 950℃ ≤ t2 ≤ 975℃.

[0057] According to an example of this application, the compressor assembly includes a third welded tube and a fourth welded tube welded together. The third welded tube is a stainless steel tube integrally formed from the flexible stainless steel, and the fourth welded tube is a copper tube or a copper alloy tube. The third welded tube and the fourth welded tube are welded together by a second solder, wherein the second solder contains, by weight, Cu: 57%-61%, Sn: 1.0%-1.5%, Si: 0.05%-0.2%, with the remainder consisting of Zn and unavoidable impurities; the flux used when using the second solder contains, by weight, 60%-80% boric acid, 5%-15% fluoride, and 10%-20% potassium borate; the melting temperature t1 when using the second solder satisfies: 880℃≤t1≤890℃; and the brazing temperature t2 when using the second solder satisfies: 920℃≤t2≤930℃.

[0058] According to one example of this application, the compressor assembly includes a fifth welded tube and a sixth welded tube welded together. The fifth welded tube has a first sleeve welded to its end, and the sixth welded tube has a second sleeve welded to its end. The first sleeve and the second sleeve are welded together by a third solder or a fourth solder. The first sleeve is a copper sleeve or a copper alloy sleeve; the second sleeve is a copper sleeve or a copper alloy sleeve; the third solder is tin bronze solder; and the fourth solder is silver copper solder.

[0059] The heat source unit according to the second aspect of this application includes a compressor assembly.

[0060] According to the heat source unit of this application example, by providing the compressor assembly described above, and by making the exhaust pipe or the first suction pipe a flexible stainless steel pipe, the exhaust pipe or the first suction pipe can be bent and extended effectively, thus saving space and optimizing the arrangement of the heat source unit. Furthermore, since the exhaust pipe or the first suction pipe retains good mechanical strength and pressure resistance after bending, it can stably transport the refrigerant medium, which is beneficial to the stability of the compressor and the heat source unit's operation.

[0061] According to one example of this application, a third piping is also included, the compressor assembly having a seventh welded pipe welded to the third piping, wherein both the seventh welded pipe and the third piping are stainless steel pipes made of the flexible stainless steel, the seventh welded pipe and the third piping are welded together by a first solder, wherein the first solder contains, by weight, 46%–50% Cu, 9%–11% Ni, 0.04%–0.25% Si, with the remainder consisting of Zn and unavoidable impurities; the flux used with the first solder contains, by weight, 60%–80% boric acid, 5%–15% fluoride, and 10%–20% potassium borate; the melting temperature t1 when using the first solder satisfies: 910℃ ≤ t1 ≤ 935℃; the brazing temperature t2 when using the first solder satisfies: 950℃ ≤ t2 ≤ 975℃.

[0062] According to one example of this application, it also includes a fourth piping, the compressor assembly having an eighth welded pipe welded to the fourth piping, the eighth welded pipe having a third sleeve welded to its end, the fourth piping having a fourth sleeve welded to its end, the third sleeve and the fourth sleeve being welded together by a third solder or a fourth solder, wherein the third sleeve is a copper sleeve or a copper alloy sleeve; the fourth sleeve is a copper sleeve or a copper alloy sleeve; the third solder is tin bronze solder; and the fourth solder is silver copper solder.

[0063] According to one example of this application, a fifth piping is also included, the compressor assembly having a ninth welded pipe welded to the fifth piping, one of the fifth piping and the ninth welded pipe being an integrally formed stainless steel pipe of the flexible stainless steel, and the other being a copper pipe or a copper alloy pipe, the fifth piping and the ninth welded pipe being welded together by a second solder, wherein the second solder contains, by weight, Cu: 57%-61%, Sn: 1.0%-1.5%, Si: 0.05%-0.2%, with the remainder consisting of Zn and unavoidable impurities; the flux used when using the second solder contains, by weight, 60%-80% boric acid, 5%-15% fluoride, and 10%-20% potassium borate; the melting temperature t1 when using the second solder satisfies: 880℃≤t1≤890℃; the brazing temperature t2 when using the second solder satisfies: 920℃≤t2≤930℃.

[0064] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0065] The accompanying drawings, which are incorporated in and form part of this specification, illustrate examples of this application and, together with their description, serve to explain the principles of this application.

[0066] Figure 1 is a schematic diagram of the structure of a compressor assembly according to an example of this application.

[0067] Figure 2 is a structural schematic diagram of a four-way valve assembly and a gas-liquid separator according to an example of this application.

[0068] Figure 3 is a structural schematic diagram of a four-way valve assembly according to an example of this application.

[0069] Figure 4 is a schematic diagram of the bent tube of a four-way valve assembly according to an example of this application.

[0070] Figure 5 is a structural schematic diagram of the exhaust pipe, compressor, and four-way valve of a compressor assembly according to an example of this application.

[0071] Figure 6 is a schematic diagram of the structure of a four-way valve according to an example of this application.

[0072] Figure 7 is a system diagram of a heat source unit according to an example of this application, and a structural schematic diagram of a compressor assembly.

[0073] Figure 8 is a schematic diagram of the structure of a four-way valve and an outdoor heat exchanger of a heat source unit according to an example of this application.

[0074] Figure 9 is a schematic diagram of the structure of a four-way valve and a compressor of an example heat source unit according to this application.

[0075] Figure 10 is a schematic diagram of the structure of a four-way valve, compressor and gas-liquid separator of a heat source unit according to an example of this application.

[0076] Figure 11 is a schematic diagram of the structure of a heat source unit according to an example of this application, showing the connection of a compressor, a gas-liquid separator, and a four-way valve assembly.

[0077] Figure 12 is a schematic diagram of the structure of a four-way valve and a shut-off valve of a heat source unit according to an example of this application.

[0078] Figure 13 is a schematic diagram of the welding between the fifth and sixth welded pipes according to an example of this application.

[0079] Figure 14 is a schematic diagram of the welding between a first welded pipe and a second welded pipe according to an example of this application.

[0080] Figure 15 is a schematic diagram of the welding between the third and fourth welded pipes according to an example of this application.

[0081] Figure 16 is an enlarged view of region A in Figure 13.

[0082] Figure 17 is an enlarged view of region B in Figure 14.

[0083] Figure 18 is an enlarged view of region C in Figure 15.

[0084] Figure 19 is a system diagram of a heat source unit according to an example of this application.

[0085] Reference numerals: 10, Four-way valve; 1, Main pipe; 2, First valve connector; 201, First connecting pipe; 202, Second connecting pipe; 2', Second valve connector; 201', Third connecting pipe; 202', Fourth connecting pipe; 21, First valve pipe; 210, First interface; 22, Second valve pipe; 220, Second interface; 23, Third valve pipe; 230, Third interface; 24, Fourth valve pipe; 240, Fourth interface; 3, Bent pipe; 301, First straight pipe section; 302, Second straight pipe section; 303, Bent section; 4, Straight pipe; 51, Retractable section; 52, Expanding section; 100, Four-way valve assembly; 10, Four-way valve; 20a, Liquid-side shut-off valve; 20b, Gas-side shut-off valve; 30, First pipe structure; 61, Filter; 62, First piping; 63, Second piping; 1000, Compressor assembly; 200, Compressor; 01, Exhaust port; 202, Return port; 300, First exhaust pipe; 301, Second exhaust pipe; 400, First suction pipe; 401, Second suction pipe; 500, Gas-liquid separator; 600, Second outlet pipe; 700, First outlet pipe; 800, Oil separator; 103, Straight suction pipe; 1011, First suction piping; 1012, First straight suction pipe; 1013, Second straight suction pipe; 1014, Suction bend pipe; 2011, Second suction piping; 2012, First suction pipe section; 2013, Second suction pipe section; 2014, Third suction pipe section; 2015, Fourth suction pipe section; 2016, Fifth suction pipe section; 3011, Bend; 71. First exhaust straight pipe; 72. Second exhaust straight pipe; 73. Third exhaust straight pipe; 74. Fourth exhaust straight pipe; 75. Fifth exhaust straight pipe; 76. Sixth exhaust straight pipe; 81. First welded pipe; 82. Second welded pipe; 83. Third welded pipe; 84. Fourth welded pipe; 85. Fifth welded pipe; 86. Sixth welded pipe; 87. First sleeve; 88. Second sleeve; 91. First solder; 92. Second solder; 93. Third solder; 94. Fourth solder; 2000. Indoor heat exchanger; 3000. Outdoor heat source heat exchanger; 4000. Indoor unit; 5000. Heat source unit; 6000. Gas connection pipe; 7000. Liquid connection pipe (outdoor unit). Detailed Implementation

[0086] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0087] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0088] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0089] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0090] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0091] As shown in Figures 1 to 19, this application discloses a heat source unit, which includes a heat source unit 5000 and an indoor unit 4000, as well as a gas connection pipe 6000 and a liquid connection pipe 7000 connecting the heat source unit 5000 and the indoor unit 4000, wherein the heat source unit 5000, the indoor unit 4000, the gas connection pipe 6000 and the liquid connection pipe 7000 form a refrigerant circulation loop. Figure 19 illustrates a refrigerant circulation loop formed by a heat source unit 5000, an indoor unit 4000, and a gas connection pipe 6000 and a liquid connection pipe 7000 connecting the two. In other embodiments, it can also be a refrigerant circulation loop formed by a heat source unit 5000 and multiple indoor units 4000, and a gas connection pipe 6000 and a liquid connection pipe 7000 connecting the heat source unit 5000 and multiple indoor units 4000, or it can be a refrigerant circulation loop formed by multiple heat source units 5000 and multiple indoor units 4000, and a gas connection pipe 6000 and a liquid connection pipe 7000 connecting the multiple heat source units 5000 and multiple indoor units 4000.

[0092] The heat source unit 5000 includes a heat source housing, which houses multiple functional components, including a compressor 200, a four-way valve 10, a heat source heat exchanger 3000, a filter 61, a gas-liquid separator 500, a liquid-side shut-off valve 20a, a gas-side shut-off valve 20b, and multiple piping PL that fluidly connects all the aforementioned components.

[0093] The indoor unit 4000 includes an indoor heat exchanger and an indoor fan, which drives indoor air to exchange heat with the indoor heat exchanger.

[0094] Compressor 200 is a machine that compresses low-pressure refrigerant into high-pressure refrigerant. Compressor 200 has a discharge port 201 and a return port 202. In the refrigerant circulation loop, the return port 202 of compressor 200 recovers the low-pressure refrigerant, which, after compression, is discharged through the discharge port 201 as high-temperature, high-pressure refrigerant. The compressor 200 in this application can be a rotary compressor or a scroll compressor, and is not limited thereto.

[0095] The four-way valve includes four ports, defined as port 210, port 220, port 230, and port 240. Port 210 is in fluid communication with the compressor discharge port 201 via piping. Port 220 is in fluid communication with the gas side of the heat exchanger 3000 via piping. Port 230 is in fluid communication with the inlet of the gas-liquid separator via piping. Port 240 is in fluid communication with the gas-side shut-off valve 20b via piping. The four-way valve has a heating mode and a cooling mode, and can automatically switch between the two modes. In heating mode, port 210 and port 220 are connected, and port 230 and port 240 are connected. In cooling mode, port 210 and port 240 are connected, and port 220 and port 230 are connected.

[0096] Furthermore, the heat source unit 5000 also includes an oil separator 800, which is located between the compressor's discharge port 201 and the first interface 210. The compressor's discharge port 201 is connected to the inlet of the oil separator 800 via a pipe, which is defined as the first discharge pipe 300. The first interface 210 is connected to the outlet of the oil separator 800 via a pipe, which is defined as the second discharge pipe 301. After the high-temperature and high-pressure refrigerant gas enters the oil separator 800, gas-oil separation is achieved. The separated high-temperature and high-pressure refrigerant gas flows into the second interface 220 through the second discharge pipe 301.

[0097] The heat source heat exchanger exchanges heat with an external heat source, which can be air, water, ground, etc. Taking Figures 7 and 19 as examples, the heat source for this heat source heat exchanger is air. An outdoor fan drives airflow through the heat source heat exchanger, allowing the refrigerant to exchange heat with the air. The gas side of the heat source heat exchanger is connected to the second interface 220 via piping, and the liquid side is fluidly connected to the liquid side shut-off valve 20a via piping.

[0098] The outlet of the gas-liquid separator is connected to the return port 202 of the compressor 200 via a piping, which is defined as the first suction pipe. The inlet of the gas-liquid separator is connected to the third interface 230 via a piping, which is defined as the second suction pipe. The low-pressure gaseous refrigerant returning from the indoor unit heat exchanger enters the gas-liquid separator through the third interface 230 of the four-way valve and the second suction pipe. After gas-liquid separation, the low-pressure refrigerant gas flows back to the return port 202 of the compressor 200 from the first suction pipe.

[0099] The gas-side shut-off valve 20b and the liquid-side shut-off valve 20a are configured as connection ports for the external pipes (gas connection pipe 6000 and liquid connection pipe 7000) of the heat source unit 5000. One end of the gas connection pipe 6000 is connected to the gas-side shut-off valve 20b, and the other end of the gas connection pipe 6000 is connected to the gas-side interface of the indoor unit 4000. One end of the liquid connection pipe 7000 is connected to the liquid-side shut-off valve 20a, and the other end of the liquid connection pipe 7000 is connected to the liquid-side interface of the indoor unit 4000.

[0100] The refrigerant circulation loop has two operating modes: cooling mode and heating mode. The refrigerant circulation path for these two modes is described below.

[0101] Cooling mode:

[0102] In cooling mode, the heat source heat exchanger acts as a condenser, and the indoor heat exchanger acts as an evaporator. The refrigerant circuit in cooling mode follows this path: compressor 200 discharge port 201 → first discharge pipe 300 → oil separator 800 → second discharge port 201 → first interface 210 → second interface 220 → heat source heat exchanger → liquid-side shut-off valve 20a → liquid connection pipe 7000 → indoor heat exchanger → gas connection pipe 6000 → gas-side shut-off valve 20b → fourth interface 240 → third interface 230 → second suction pipe → gas-liquid separator → first suction pipe → compressor return port 202. In the heat source heat exchanger, the refrigerant exchanges heat with the external environment. Through heat dissipation, the gaseous refrigerant gradually cools and condenses into liquid refrigerant. The liquid refrigerant enters the indoor heat exchanger, where it absorbs heat and evaporates into gaseous refrigerant, thus achieving the cooling effect. The evaporated gaseous refrigerant then returns to the compressor 200 to begin a new cycle.

[0103] Heating mode:

[0104] In heating mode, the heat source heat exchanger is the evaporator, and the indoor heat exchanger is the condenser. The flow path is as follows: compressor 200 discharge port 201 → first discharge pipe 300 → oil separator 800 → second discharge pipe 301 → first interface 210 → fourth interface 240 → gas-side shut-off valve 20b → gas connection pipe 6000 → indoor heat exchanger → liquid connection pipe 7000 → liquid-side shut-off valve 20a → heat source heat exchanger → second interface 220 → third interface 230 → first suction pipe 400 → gas-liquid separator 500 → second suction pipe 401 → compressor 200 return port 202. In the indoor heat exchanger, the refrigerant undergoes heat exchange, releasing heat and raising the indoor space temperature. During the heat release process, the gaseous refrigerant gradually cools and condenses into a liquid refrigerant. After flowing out of the indoor heat exchanger, the liquid refrigerant enters the heat source heat exchanger. In the heat source heat exchanger, the refrigerant absorbs heat from the environment and evaporates into a gaseous refrigerant.

[0105] The four-way valve includes a main pipe 1 and four valve connectors 2. A switching valve core (not shown) is installed inside the main pipe 1. The switching valve core is movable between a first position and a second position. One end of each valve connector 2 is welded to the main pipe and communicates with its interior. The other end of each valve connector forms an interface. The four valve connectors 2 are defined as a first valve pipe 21, a second valve pipe 22, a third valve pipe 23, and a fourth valve pipe 24. The other end of the first valve pipe 21 forms a first interface 210, the other end of the second valve pipe 22 forms a second interface 220, the other end of the third valve pipe 23 forms a third interface 230, and the other end of the fourth valve pipe 24 forms a fourth interface 240. When the four-way valve switches to cooling mode, the switching valve core moves to the first position, connecting the first and second valve pipes, and the third and fourth valve pipes. When the four-way valve is in heating mode, the switching valve core moves to the second position, connecting the first and fourth valve pipes, and the third and fourth valve pipes.

[0106] In this application, one or more functional components are made of flexible stainless steel, and one or more pipes are made of flexible stainless steel.

[0107] Material properties of flexible stainless steel:

[0108] According to one example of this application, the yield strength of the flexible stainless steel is 140–180 MPa; and / or, the tensile strength of the flexible stainless steel is reduced to 400–600 MPa; and / or, the elongation of the flexible stainless steel is 50–80%; and / or, the yield strength ratio of the flexible stainless steel is less than 0.4; and / or, the hardness of the flexible stainless steel material is 90–120 Hv. The yield strength and tensile strength of flexible stainless steel are lower than those of ordinary stainless steel materials (such as 304L stainless steel), but higher than those of copper. Furthermore, the elongation and hardness of flexible stainless steel are similar to those of copper and much lower than those of ordinary stainless steel materials (such as 304L stainless steel). The flexible stainless steel pipe involved in this application, due to its lower yield strength and higher elongation, possesses processing performance close to that of copper pipes and can be processed using equipment for flanging, bending, flaring, and necking of copper pipes. Unlike traditional stainless steel flanging processes that require punching before flanging, stainless steel pipes can be punched and flanged in a single step, just like copper pipes. The flexible stainless steel pipes involved in this application, due to their near-copper-level processing performance and significantly superior mechanical properties, can shorten piping lengths and reduce bending radii, allowing for more space-saving piping structure designs. In terms of processing, copper pipes typically require a bending radius of at least 1.8 times their outer diameter; while flexible stainless steel, due to its better toughness, can theoretically achieve a bending radius of 1.2 to 1.5 times its outer diameter. Furthermore, because stainless steel has better strength than copper, stronger resistance to vibration stress, and is less prone to vibration cracking, the number of bends in the refrigerant piping system to reduce vibration stress can be reduced, thereby saving piping space and reducing the overall size of the unit. The flexible stainless steel pipes used in this application, due to the aforementioned advantages, allow for thinner pipe walls, achieving a lightweight design.

[0109] According to one example of this application, the flexible stainless steel is austenitic stainless steel with an average grain size of 20 μm to 40 μm. Thus, austenitic stainless steel with a grain size of 20 μm to 40 μm not only maintains the inherent good corrosion resistance and processability of austenitic stainless steel, but also achieves superior mechanical properties and a potentially longer service life due to grain refinement.

[0110] According to one example of this application, the M of flexible stainless steel D30 / 50 The temperature range is -50℃ to -80℃. In the field of stainless steel materials, MD30 / 50 represents the temperature at which 50% martensite is formed after cold deformation with a true strain of 30%. This parameter is very important for predicting the behavior of stainless steel during processing because martensite formation affects the material's hardness and magnetism. Generally speaking, M... D30 / 50A lower Md30 value indicates that the material is less likely to form martensite under the same deformation conditions, thus exhibiting stronger resistance to aging cracking and being less prone to cracking. Conversely, a higher Md30 value makes the material more susceptible to martensite formation during processing, potentially leading to cracking. Therefore, flexible stainless steel with a higher Md30 value... D30 / 50 The M value is much lower than that of 304L stainless steel. D30 / 50 At 31.7℃, it is theoretically very difficult to produce a martensitic phase transformation during processing at room temperature. By ensuring that the critical temperature for the martensitic transformation of flexible stainless steel meets the above conditions, the flexible stainless steel material can work well in low-temperature environments and has good stability.

[0111] Composition of flexible stainless steel:

[0112] In one embodiment, the material composition of flexible stainless steel includes at least Cu. The addition of Cu can increase the stacking fault energy, inhibit the formation of ε-martensite, and thus inhibit the formation of α′-martensite. Generally speaking, the greater the elongation of the sheet, the greater the work hardening index, the more favorable the tensile properties of the sheet, and the better its cold forming performance. The forming performance of austenitic alloys is closely related to the martensitic phase transformation that occurs during forming. The addition of copper can increase the stacking fault energy of stainless steel and inhibit the formation of martensite during the deformation of stainless steel. Copper is a beneficial element for improving forming performance. In addition, in austenitic steel, the increase of copper content can improve the stability of austenite, slow down cold work strengthening, and significantly increase the processing force that the material can withstand during cold working, thereby greatly improving the cold heading performance and deep drawing performance of the steel.

[0113] In one embodiment, the flexible stainless steel composition includes at least copper and nickel. Both Cu and Ni are austenite stabilizing elements, positively impacting the formation of retained austenite and the strength-plasticity balance. Simultaneously, elements such as Ni and Cu increase the stacking fault energy of the material. Ni is a major austenite stabilizing element, and its addition expands the γ-phase region. Adding Ni also increases the alloy's potential and passivation tendency, thereby improving the corrosion resistance of stainless steel. Ni also exhibits high resistance to acids and alkalis. Ni reduces the energy of the interaction between dislocations and interstitial atoms, thus improving the plasticity and toughness of stainless steel. Ni can also effectively improve the cold work hardening tendency of stainless steel, enhancing its cold forming ability. This is mainly because the increase in Ni improves the stability of the austenite structure and reduces martensite formation. In austenitic stainless steel, the solid solution of Ni improves the thermodynamic stability of the stainless steel, giving it better corrosion resistance. It is the only important element for improving the resistance of austenitic stainless steel to transgranular corrosion in many media.

[0114] In one embodiment, the flexible stainless steel tube may be composed of the following components and their mass percentages: C: 0%–0.02%, Cu: 2%–4%, Ni: 9%–11%, Si: 0%–1%, Mn: 1%–2%, Cr: 16%–18%, Mo: 0%–0.03%, P: 0%–0.03%, and S: 0%–0.03%. Compared with common stainless steel materials, such as 304L stainless steel, by reducing the carbon content, increasing the nickel content, and introducing copper, the goal of reducing the yield strength of stainless steel and improving austenitic stability and weldability is achieved. Specifically, a carbon content of less than 0.02% can effectively reduce the yield strength of stainless steel; a nickel content of greater than 9% but less than 11% can significantly improve austenitic stability; and a copper content of 2%–4% can improve the wettability of copper brazing, while the copper in solid solution can improve austenitic stability and reduce the yield strength of stainless steel.

[0115] Applications of Flexible Stainless Steel

[0116] The piping is made of flexible stainless steel.

[0117] The piping between the first port 210 of the first valve pipe and the compressor exhaust port 201 is defined as an exhaust pipe assembly, which includes a first exhaust pipe 300 and a second exhaust pipe 301. At least a portion of the exhaust pipe assembly is made of flexible stainless steel. Further, the first exhaust pipe 300 is made of flexible stainless steel, and / or the second exhaust pipe 301 is made of flexible stainless steel.

[0118] The piping between the third port 230 of the third valve pipe and the compressor return port 202 is defined as a suction pipe assembly. The suction pipe assembly includes a first suction pipe and a second suction pipe. At least a portion of the suction pipe assembly is made of flexible stainless steel, and the material composition of the flexible stainless steel includes at least Cu. Further, the first suction pipe is made of flexible stainless steel, and / or the second suction pipe is made of stainless steel.

[0119] Flexible stainless steel is a type of stainless steel material with high ductility and flexibility. It can adapt to complex shape changes and bending requirements without sacrificing its corrosion resistance and mechanical strength. Even after complex forming processes, such as processing into corrugated pipes or sleeves of specific shapes, it still maintains good mechanical strength and compressive strength. Flexible stainless steel is easy to bend, weld, and connect. By making only part of the exhaust pipe assembly or at least part of the intake pipe assembly made of flexible stainless steel, the exhaust or intake pipe assembly can be bent more effectively, saving space and optimizing the layout of the heat source unit 5000. Furthermore, because the exhaust or intake pipe assembly still has good mechanical strength and compressive strength after bending, it can stably transport the refrigerant medium, which is beneficial to the stability of the refrigerant circulation loop.

[0120] According to one example of this application, the exhaust pipe assembly is a stainless steel pipe made of flexible stainless steel, and the exhaust pipe assembly has multiple bends, and / or, the first intake pipe 400 is a stainless steel pipe made of flexible stainless steel, and the first intake pipe 400 has multiple bends.

[0121] Referring to Figure 5, the exhaust pipe assembly includes a first exhaust pipe 300 and a second exhaust pipe 301 connected together. The first exhaust pipe 300 includes a first exhaust straight pipe 71, a second exhaust straight pipe 72, and an exhaust bend. The exhaust bend connects the first exhaust straight pipe 71 and the second exhaust straight pipe 72. The end of the second exhaust straight pipe 72 furthest from the exhaust bend is connected to a second exhaust piping. The diameters of the first exhaust straight pipe 71 and the second exhaust straight pipe 72 are both d, and the bending radius of the intake bend is r, satisfying 1.2d ≤ r ≤ 1.5d.

[0122] In the example shown in Figure 5, an oil separator 800 is connected to one end of the exhaust pipe 500 facing the four-way valve 100. In the example shown in Figure 9, the oil separator 800 is disposed between the two sections of the first exhaust pipe 300 and the second exhaust pipe 301.

[0123] The first exhaust straight pipe 71 has a limiting part at the end away from the exhaust bend that cooperates with the limiting part of the external intake pipe. The limiting part is a convex bulge or an annular protrusion extending around the axis of the first exhaust straight pipe 71.

[0124] The second exhaust pipe 301 includes multiple exhaust straight pipes, including a third exhaust straight pipe 73, a fourth exhaust straight pipe 74, a fifth exhaust straight pipe 75 and a sixth exhaust straight pipe 76 connected in sequence. The third exhaust straight pipe 73, the fourth exhaust straight pipe 74, the fifth exhaust straight pipe 75 and the sixth exhaust straight pipe 76 are all bent in pairs, and the direction of the bend can be the same or different.

[0125] For example, the first exhaust straight pipe 71, the second exhaust straight pipe 72, and the sixth exhaust straight pipe 76 are all arranged in parallel.

[0126] One end of the first intake pipe is welded with a copper sleeve or a copper alloy sleeve.

[0127] According to an example of this application, referring to FIG12, the first inhalation tube 400 and / or the second inhalation tube 401 include a plurality of straight inhalation tubes 103, with a bend 3011 connecting two adjacent straight inhalation tubes 103. Alternatively, the first inhalation tube 400 may include a plurality of straight inhalation tubes 103, with a bend 3011 connecting two adjacent straight inhalation tubes 103; or the second inhalation tube 401 may include a plurality of straight inhalation tubes 103, with a bend 3011 connecting two adjacent straight inhalation tubes 103; or both the first inhalation tube 400 and the second inhalation tube 401 may include a plurality of straight inhalation tubes 103, with a bend 3011 connecting two adjacent straight inhalation tubes 103.

[0128] A straight suction pipe 103 is provided in the first suction pipe 400 and / or the second suction pipe 401 to facilitate the connection and assembly of the first suction pipe 400 and / or the second suction pipe 401.

[0129] According to an example of this application, referring to Figure 12, the bend 3011 is an arc to prevent stress concentration at the bend 3011. The bend 3011 of the first suction pipe 400 and / or the second suction pipe 401 is an arc bend design, rather than a simple right angle or acute angle turn. This design helps the refrigerant flow through the bend 3011, reduces refrigerant fluid resistance and turbulence generation, thereby reducing energy loss and improving system efficiency; the arc-shaped bend 3011 can guide the refrigerant flow more naturally, reduce the impact of the refrigerant on the pipe wall of the return pipe 10, increase the stability of the system, and may reduce wear on the pipe wall during long-term operation.

[0130] According to an example of this application, referring to FIG12, the first intake pipe 400 includes a first intake pipe 1011 and a second intake pipe 2011 connected together. The first intake pipe 1011 includes a first intake straight pipe 1012, a second intake straight pipe 1013 and an intake bend pipe 1014. The intake bend pipe 1014 is connected between the first intake straight pipe 1012 and the second intake straight pipe 1013. The end of the second intake straight pipe 1013 away from the intake bend pipe 1014 is connected to the second intake pipe 2011.

[0131] The first intake pipe 1011 and the second intake pipe 2011 can be integrally formed from the flexible stainless steel of the return pipe 10, which eliminates the need to process the first intake pipe 1011 and the second intake pipe 2011 on the return pipe 10, and also simplifies the process of processing the first intake pipe 1011 and the second intake pipe 2011, thus ensuring the connection strength between the first intake pipe 1011 and the second intake pipe 2011.

[0132] The first intake piping 1011 includes a first intake straight pipe 1012, a second intake straight pipe 1013, and an intake bent pipe 1014. When the return pipe 10 is integrally formed, the first intake straight pipe 1012, the second intake straight pipe 1013, and the intake bent pipe 1014 can be processed. This eliminates the need for the intake bent pipe 1014 to be installed between the first intake straight pipe 1012 and the second intake straight pipe 1013. It also simplifies the process of processing the first intake straight pipe 1012, the second intake straight pipe 1013, and the intake bent pipe 1014, and ensures the connection strength between the first intake straight pipe 1012, the second intake straight pipe 1013, and the intake bent pipe 1014. The return pipe 10 is made of stainless steel. Stainless steel has lower yield strength and higher ductility, which makes the return pipe 10 easier to bend. It also makes the bending radius of the intake bending pipe 1014 smaller and less likely to crack on the outside or wrinkle on the inside.

[0133] According to an example of this application, referring to FIG12, a bend 3011 is provided between the second suction pipe 2011 and the first suction pipe 1011. The second suction pipe 2011 and the first suction pipe 1011 are arranged at an angle. When the refrigerant flows in the return pipe 10, the return pipe 10 is bent to reduce the vibration of the return pipe 10.

[0134] According to an example of this application, referring to Figure 12, the diameters of the first intake straight pipe 1012 and the second intake straight pipe 1013 are both d, and the bending radius of the intake bending pipe 1014 is r, satisfying 1.2d≤r≤1.5d. The first intake pipe 400 is made of stainless steel, which allows the intake bending pipe 1014 to have a smaller bending radius; moreover, stainless steel pipes are stronger, have stronger resistance to vibration stress, and are less prone to vibration cracking, which can reduce the number of intake bending pipes 1014 provided in the return pipe 10 to reduce vibration stress, thereby saving pipeline space and reducing the overall size of the machine.

[0135] For example, the diameter of the first intake straight pipe 1012 and the second intake straight pipe 1013 can both be 15mm, and the bending radius of the intake bending pipe 1014 can be in the range of 18mm-22.5mm. For example, the bending radius of the intake bending pipe 1014 can be 18mm, 19mm, 20mm, 22mm or 22.5mm, etc.

[0136] According to an example of this application, referring to FIG12, the second intake pipe 401 includes multiple pipe segments, with a bend 3011 connecting two adjacent pipe segments. The multiple pipe segments are a first intake pipe segment 2012, a second intake pipe segment 2013, a third intake pipe segment 2014, a fourth intake pipe segment 2015, and a fifth intake pipe segment 2016 connected in sequence.

[0137] When the refrigerant flows in the second suction pipe 401, it impacts the second suction pipe 401. At the same time, when the heat source unit 5000 is working, the compressor 200 will vibrate. Multiple bends 3011 are made on the second suction pipe 401. The multiple bends 3011 can make the second suction pipe 401 better withstand the impact from the compressor 200 and the refrigerant. At the same time, the bends 3011 are connected between two adjacent pipe sections, which can facilitate the flow of refrigerant in the second suction pipe 401.

[0138] The first intake pipe segment 2012, the third intake pipe segment 2014 and the fifth intake pipe segment 2016 all extend along a first direction (e.g., the e1 direction in Figure 12), and the second intake pipe segment 2013 and the fifth intake pipe segment 2016 extend along a second direction (e.g., the horizontal direction). The first direction and the second direction are perpendicular to each other.

[0139] Based on the spatial layout of the heat source unit 5000, the bend 3011 of the second suction pipe 401 and the extension direction of multiple pipe segments are designed, and the spatial position of the second return pipe 10 is reasonably arranged so that the second return pipe 10 can better withstand the impact from the refrigerant and the vibration of the compressor 200. Referring to Figure 12, the reliability of the second return pipe 10 during operation is improved.

[0140] According to one example of this application, an expansion tube is provided at one end of the first intake tube 400 and / or the second intake tube 401, the diameter of which is larger than the diameter of the intake straight tube 103, and a retraction tube is provided at the other end of the first intake tube 400 and / or the second intake tube 401, the diameter of which is smaller than the diameter of the intake straight tube 103; or, expansion tubes are provided at both ends of the first intake tube 400 and / or the second intake tube 401, the diameter of which is larger than the diameter of the intake straight tube 103; or, retraction tubes are provided at both ends of the first intake tube 400 and / or the second intake tube 401, the diameter of which is smaller than the diameter of the first intake straight tube 103.

[0141] The external piping can extend into the expansion tube, and one end of the external piping can abut against the bottom wall of the expansion tube. This restricts the installation position of the external piping with the first intake pipe 400 and / or the second intake pipe 401, facilitating connection between the external piping and one end of the first intake pipe 400 and / or the second intake pipe 401. The external piping can extend into the expansion tube and can be fixed to the expansion tube by welding. Stainless steel pipes have lower yield strength, lower hardness, and higher ductility, thus making the expansion tube easier to process and allowing for a higher flaring ratio.

[0142] The retraction tube can extend into the external piping, and one end of the retraction tube can abut against the bottom wall of the external piping to restrict the installation position of the external piping and the first suction pipe 400 and / or the second suction pipe 401, facilitating the connection between the external piping and one end of the first suction pipe 400 and / or the second suction pipe 401. The retraction tube can extend into the external piping, and the external piping and the expansion tube can be fixed by welding. Flexible stainless steel pipes have lower yield strength, lower hardness, and higher ductility, therefore the retraction tube is easier to process and allows for a higher necking rate.

[0143] According to one example of this application, the expansion tube includes at least one sub-expansion tube. The expansion tube may include one sub-expansion tube or multiple sub-expansion tubes. When there are multiple sub-expansion tubes, they are connected sequentially. In the direction from the bend 3011 to the intake straight pipe 103, the diameters of the multiple sub-expansion tubes increase sequentially. The diameter of the sub-expansion tube closer to the bend 3011 is smaller than the diameter of the sub-expansion tube farther from the bend 3011, causing the sub-expansion tubes to expand outwards sequentially. The external piping can also retract correspondingly to the multiple sub-expansion tubes, allowing for better positioning of the external piping and the intake straight pipe 103.

[0144] According to one example of this application, the retraction tube includes at least one sub-retraction tube. The retraction tube may include one sub-retraction tube or multiple sub-retraction tubes. When there are multiple sub-retraction tubes, they are connected sequentially. In the direction from the bend 3011 to the intake straight pipe 103, the diameters of the multiple sub-retraction tubes decrease sequentially. The diameter of the sub-retraction tube closer to the bend 3011 is larger than the diameter of the sub-retraction tube farther from the bend 3011, causing the sub-retraction tubes to retract inwards sequentially. The external piping can also expand correspondingly to the multiple sub-retraction tubes, allowing for better positioning of the external piping and the intake straight pipe 103.

[0145] According to one example of this application, a limiting portion is provided at one end of the first intake pipe 400 and / or the second intake pipe 401. The limiting portion cooperates with the external piping to limit the depth to which the first intake pipe 400 and / or the second intake pipe 401 is inserted into the external piping, and to position the installation position between the first intake pipe 400 and / or the second intake pipe 401 and the external piping. For example, the limiting portion may be a protrusion on the outer wall of the intake straight pipe 103, which can abut against the axial end face of the external piping when the intake straight pipe 103 is inserted into the external piping.

[0146] According to one example of this application, the limiting part is a protrusion. The protrusion can be provided on the outer wall of the intake straight pipe 103, or it can be integrally formed on the intake straight pipe 103, which simplifies the processing technology of the protrusion. When the external piping is inserted into the intake straight pipe 103, the protrusion can abut against the axial end face of the external piping to limit the installation position between the intake straight pipe 103 and the external piping. Multiple protrusions can be provided, and the multiple protrusions can be spaced apart circumferentially along the intake straight pipe 103.

[0147] Alternatively, the limiting part can be an annular protrusion extending around the axis of the intake straight pipe 103. The annular protrusion can be provided on the outer wall of the intake straight pipe 103; or the annular protrusion can be integrally formed on the intake straight pipe 103, which simplifies the manufacturing process of the annular protrusion. When the external piping is inserted into the intake straight pipe 103, the annular protrusion can abut against the axial end face of the external piping to limit the installation position between the intake straight pipe 103 and the external piping.

[0148] One end of the first suction pipe 400 is connected between the compressor 200 and the gas-liquid separator 500. The second suction pipe 401 is connected between the gas-liquid separator 500 and the four-way valve assembly 100. The refrigerant is delivered to the second suction pipe 401 through the four-way valve assembly 100, and then reaches the gas-liquid separator 500 through the second suction pipe 401. After being separated in the gas-liquid separator 500, it reaches the compressor 200 through the first suction pipe 400.

[0149] The first suction pipe 400 and / or the second suction pipe 401 have multiple bends 3011. This can be: the first suction pipe 400 has multiple bends 3011; the second suction pipe 401 has multiple bends 3011; or both the first and second suction pipes 400 and 401 have multiple bends 3011. The first suction pipe 400 and / or the second suction pipe 401 are integrally formed flexible stainless steel pipes. This can be: the first suction pipe 400 is integrally formed flexible stainless steel pipe; the second suction pipe 401 is integrally formed flexible stainless steel pipe; or both the first and second suction pipes 400 and 401 are integrally formed flexible stainless steel pipes.

[0150] When the refrigerant flows within the return pipe 10, it impacts the return pipe 10. Simultaneously, when the heat source unit 5000 operates, the compressor 200 vibrates. In this application, the first suction pipe 400 and / or the second suction pipe 401 are integrally formed flexible stainless steel pipes. Stainless steel pipes have high strength and can withstand the high-intensity impacts from the compressor 200 and the refrigerant, thereby improving the reliability of the return pipe 10 during operation. Furthermore, bends 3011 are provided on the first suction pipe 400 and / or the second suction pipe 401. These bends reduce the vibration experienced by the return pipe 10.

[0151] The first suction pipe 400 and / or the second suction pipe 401 are manufactured using a flexible stainless steel one-piece molding process, which increases the structural strength of the first suction pipe 400 and / or the second suction pipe 401 while reducing the manufacturing cost. The first suction pipe 400 and / or the second suction pipe 401 are made of stainless steel, which has lower yield strength and higher ductility. This makes the first suction pipe 400 and / or the second suction pipe 401 easier to bend, allowing for a smaller bending radius at the bend 3011 and reducing the likelihood of cracking on the outside and wrinkling on the inside of the bend.

[0152] Flexible stainless steel is copper-containing stainless steel. The presence of copper gives stainless steel better ductility and flexibility because copper forms fine, dispersed phases within the stainless steel, hindering dislocation movement and thus increasing the material's yield strength. Furthermore, appropriate amounts of copper can refine the grains, reducing defects at grain boundaries and improving the material's toughness. Additionally, the addition of copper can induce a martensitic phase transformation, further enhancing the stainless steel's strength. It is understandable that stainless steel tubes are easier to bend than conventional stainless steel tubes. In the design of the heat source unit 5000, to make the structure more compact, the arrangement space for the first suction pipe 400 and / or the second suction pipe 401 should not be too large. In this application, the first suction pipe 400 and / or the second suction pipe 401 are integrally formed flexible stainless steel tubes. When bending the stainless steel tube, its bending limit is greater. Therefore, during the design of the heat source unit 5000, it is easier to arrange the stainless steel tube within the arrangement space when the arrangement space changes, thereby reducing the design difficulty of the heat source unit 5000.

[0153] During the process of assembling the return pipe 10 onto the heat source unit 5000, the operating space around the return pipe 10 is often small. Stainless steel pipes are easier to adjust the posture of the pipes during assembly, which can reduce the operator's operating difficulty, thereby reducing assembly difficulty and improving assembly efficiency.

[0154] In addition, stainless steel has strong chemical stability, and stainless steel pipes can better resist corrosion from the external environment during use, thus extending the service life of the return gas pipe 10. Stainless steel pipes also have lower manufacturing costs, which can reduce the cost of the return gas pipe 10.

[0155] According to an example of the return pipe 10 of this application, the first intake pipe 400 and the second intake pipe 401 are integrally formed stainless steel pipes of flexible stainless steel. The stainless steel pipes have high strength, lower yield strength and higher ductility, which can improve the reliability of the return pipe 10 during operation, and reduce the design and assembly difficulty of the heat source unit 5000, thereby improving assembly efficiency.

[0156] According to one example of this application, the fourth port 240 of the four-way valve is connected to the gas-side shut-off valve 20b via a piping, which is defined as a first pipe structure 30. At least a portion of the first pipe structure is made of flexible stainless steel. In this application, at least a portion of the first pipe structure 30 is a flexible stainless steel component; that is, a portion of the first pipe structure 30 may be a flexible stainless steel tube, or the first pipe structure 30 may be a single-piece flexible stainless steel component. Specifically, the tube body in which a portion of the first tube structure 30 is made of flexible stainless steel can be understood as follows: Flexible stainless steel can be used at bending points according to the actual needs of the first tube structure 30. This allows the first tube structure 30 to adapt to complex shape changes and bending requirements without sacrificing its corrosion resistance and mechanical strength. Flexible stainless steel can also be used at stress concentration points in the first tube structure 30, thus maintaining good mechanical strength and compressive strength at these stress concentration points. Furthermore, the welding points between the first tube structure 30 and the fourth interface 240 of the four-way valve 10, or between the first tube structure 30 and the gas-side shut-off valve 20b, can also be made of flexible stainless steel. At these welding points, the first tube structure 30 can be directly welded to copper or copper alloy structures. The welding method can be brazing or fusion welding as described in the above examples, and the solder and flux can be the same as those used for welding flexible stainless steel to copper or copper alloys as described in the above examples, which will not be elaborated upon here.

[0157] Therefore, by making at least a portion of the first tube structure 30 a flexible stainless steel integrally formed stainless steel part, the first tube structure 30 can be bent or its local structural strength can be improved according to actual needs, or the welding difficulty of the first tube structure 30 can be reduced, thereby improving the welding efficiency of the first tube structure 30.

[0158] According to an example of this application, as shown in Figures 1-3 and 9-14, the first pipe structure 30 includes a filter 61, a first pipe 62 connecting the filter 61 and the shut-off valve 20, and a second pipe connecting the filter 61 and the gas-side shut-off valve 20b. The first pipe 62 is a flexible stainless steel pipe integrally formed. By making the first pipe 62 between the filter 61 and the gas-side shut-off valve 20b a flexible stainless steel pipe integrally formed, the first pipe 62 can be better connected to the filter 61 and the gas-side shut-off valve 20b. For example, the filter 61 can be integrally formed with the first pipe 62. By making the first pipe 62 a flexible stainless steel pipe integrally formed, the first pipe 62 can be better welded to the gas-side shut-off valve 20b. Alternatively, the filter 61 and the first pipe 62 can be two separate structural components, and the first pipe 62 can also be better welded to the filter 61. In addition, since the first pipe 62 is a flexible stainless steel pipe integrally formed, the structure of the first pipe 62 can be designed well according to actual needs. The structural design includes the bending design of the first pipe 62 and the design of the flaring or shrinking of the pipe opening of the first pipe 62. Thus, the first pipe 62 can have high flexibility.

[0159] The piping between the four-way valve 10 and the filter 61 is a second piping 63, which is a flexible, integrally formed stainless steel pipe. By making the second piping 63 a flexible, integrally formed stainless steel pipe, it can be better connected to both the four-way valve 10 and the filter 61. For example, the filter 61 can be integrally formed with the second piping 63, and by making the second piping 63 a flexible, integrally formed stainless steel pipe, it can be better welded to the four-way valve 10. Alternatively, the filter 61 and the second piping 63 can be two separate structural components, and the second piping 63 can also be better welded to the filter 61. Furthermore, because the second piping 63 is a flexible, integrally formed stainless steel pipe, its structure can be better designed according to actual needs. This structural design includes bending designs for the second piping 63, and flaring or contracting designs at the pipe openings, thus giving the second piping 63 high flexibility.

[0160] Optionally, the first pipe structure 30 is a flexible stainless steel integrally formed stainless steel part. That is, both the filter 61 and the first pipe 62 are made of flexible stainless steel. The filter element and the first pipe 62 can be integrated parts of flexible stainless steel. This can reduce the welding between the filter element and the first pipe 62, and also improve the connection strength and sealing between the filter element and the first pipe 62. In addition, flexible stainless steel is less expensive than copper, thereby reducing the production cost of the filter element and the first pipe 62. According to an example of this application, as shown in Figures 1-3 and 9-14, the first pipe structure 30 includes a filter 61. Optionally, the first pipe structure 30 is a flexible stainless steel integrally formed stainless steel part, that is, both the filter and the second pipe 63 are made of flexible stainless steel. The filter and the second pipe 63 can be integrated parts of flexible stainless steel. In some examples, the filter, the first pipe 62 and the second pipe 63 are all made of flexible stainless steel, and the filter, the first pipe 62 and the second pipe 63 can be integrated parts of flexible stainless steel. Therefore, the welding of the first pipe structure 30 can be reduced, and the connection strength and sealing performance of the first pipe structure 30 can be improved. Moreover, flexible stainless steel is less expensive than copper, thereby reducing the production cost of the first pipe structure 30.

[0161] According to an example of this application, as shown in Figures 1-3 and 9-14, the four-way valve 10 includes a valve connector, which is a flexible stainless steel pipe integrally formed, and is welded to a second piping 63. The four-way valve 10 has a first valve pipe 21, a second valve pipe 22, a third valve pipe 23, and a fourth valve pipe 24. The first valve pipe 21 is connected to a first exhaust pipe 300, the second valve pipe 22 is connected to a first intake pipe 400 of the compressor 200, the third valve pipe 23 is connected to a first pipe structure 30, which is the first outlet pipe 700, and the fourth valve pipe 24 is connected to a second outlet pipe 600. By making the third valve pipe 23 a stainless steel pipe, in one example, the third valve pipe 23 and the second piping 63 are welded together. When welding the third valve pipe 23 and the second piping 63, it can be a direct weld between flexible stainless steel components, which is simple and convenient. In one example, the third valve pipe 23 and the second piping 63 are integrally formed components, but this application does not impose any limitations.

[0162] Optionally, the first pipe structure 30 is a flexible stainless steel component, and the four-way valve 10 includes a valve connector 2, wherein the valve connector 2 and the first pipe structure 30 are integrally formed flexible stainless steel components.

[0163] As shown in Figures 1-3 and 9-14, according to an example of the heat source unit 5000 of this application, the valve unit is a four-way valve 10. The heat source unit 5000 also includes a shut-off valve 20 and a first pipe structure 30. The four-way valve 10, the shut-off valve 20 and the first pipe structure 30 constitute a four-way valve assembly 100. That is, the four-way valve assembly 100 includes a four-way valve 10, a gas-side shut-off valve 20b and a first pipe structure 30. The first pipe structure 30 is welded and connected between the four-way valve 10 and the gas-side shut-off valve 20b. At least part of the first pipe structure 30 is a flexible stainless steel integrally formed stainless steel part.

[0164] Flexible stainless steel is a type of stainless steel material with high ductility and flexibility. It can adapt to complex shape changes and bending requirements without losing its corrosion resistance and mechanical strength. Even after undergoing complex forming processes, such as processing into corrugated pipes or sleeves of specific shapes, it can still maintain good mechanical strength and compressive strength. Flexible stainless steel is easy to bend, weld and connect.

[0165] The second port 220 of the four-way valve is connected to the heat source heat exchanger via piping made of flexible stainless steel.

[0166] Applications of Flexible Stainless Steel in Functional Components

[0167] At least a portion of the four-way valve is made of flexible stainless steel.

[0168] As shown in Figures 1-19, a valve unit according to an example of this application includes a main body pipe 1 and a valve connector 2. At least one of the four valve connectors 2 is made of flexible stainless steel. The valve connectors 2 of this application are configured as straight pipes or a combination of straight pipes and bends.

[0169] In one embodiment, the valve connector 2 is configured as a straight pipe structure, at least one of the four valve connectors is configured as a straight pipe structure, and at least one of the four valve connectors 2 is made of flexible stainless steel material.

[0170] In one embodiment, at least one valve connector 2 is configured as a combination of a bent pipe and a straight pipe. In this embodiment, the valve connector 2 includes a first connecting pipe 201 and a second connecting pipe 202. The first connecting pipe 201 is located between the main pipe 1 and the second connecting pipe 202, and the second connecting pipe 202 is connected to an external piping. The first connecting pipe 201 is a straight pipe, and the second connecting pipe 202 is a bent pipe. The first connecting pipe 201 and the second connecting pipe 202 are integrally formed flexible stainless steel pipes.

[0171] Regarding the second connecting pipe 202, it is understood that the space inside the housing of the heat source unit 5000 is limited. By setting the second connecting pipe 202, the components of the heat source unit 5000 can be arranged flexibly, providing good flexibility. Furthermore, the heat source unit 5000 is prone to vibration during operation. Appropriate bending of the pipe can act as a buffer, reducing vibration transmission, thereby protecting the pipe and extending the service life of the heat source unit 5000. In addition, reasonable bending of the second connecting pipe 202 can also help regulate the flow rate and direction of the refrigerant, optimize the refrigerant distribution in the air conditioning system, improve the heat exchange rate, and thus enhance the cooling or heating performance of the heat source unit 5000.

[0172] Furthermore, the first connecting pipe 201 and the second connecting pipe 202 are integrally formed flexible stainless steel pipes, meaning that the first connecting pipe 201 and the second connecting pipe 202 are integrated components integrally formed from flexible stainless steel. The flexible stainless steel is copper-containing stainless steel. The presence of copper in the stainless steel gives it good ductility and flexibility because copper forms fine, dispersed phases within the stainless steel, hindering dislocation movement and thus increasing the material's yield strength. Additionally, appropriate amounts of copper can refine the grains, reducing defects at grain boundaries and improving the material's toughness. Furthermore, the addition of copper can induce a martensitic phase transformation, thereby increasing the strength of the stainless steel.

[0173] Therefore, by using flexible stainless steel containing copper, the stainless steel pipe can adapt to complex shape changes and bending requirements without losing its corrosion resistance and mechanical strength. Even after undergoing complex forming processes, such as processing into corrugated pipes or sleeves of specific shapes, it can still maintain good mechanical strength and compressive strength. Flexible stainless steel is easy to bend, weld and connect. Therefore, when producing valve units, the valve connecting pipe 2 can be integrally formed on the main pipe 1, and then the valve connecting pipe 2 can be directly connected to the external piping.

[0174] The first connecting pipe 201 and the second connecting pipe 202 of this application are integrally formed, which reduces the welding process between the first connecting pipe 201 and the second connecting pipe 202, thereby reducing production costs. Simultaneously, the integral forming of the first connecting pipe 201 and the second connecting pipe 202 also improves the connection strength and sealing performance between them. Furthermore, valve fittings or bent pipes in related technologies are often made of copper to reduce the welding difficulty, but copper is expensive. In this application, the first connecting pipe 201 and the second connecting pipe 202 are both made of flexible stainless steel. Therefore, the valve unit of this application can significantly reduce production costs.

[0175] According to an example valve unit of this application, by making the first connecting pipe 201 and the second connecting pipe 202 integrally formed flexible stainless steel, the welding process between the first connecting pipe 201 and the second connecting pipe 202 can be reduced, and the connection strength and sealing performance between the first connecting pipe 201 and the second connecting pipe 202 can be improved. Furthermore, flexible stainless steel is less expensive than copper, thereby reducing the production cost of the valve unit.

[0176] According to one example of this application, the main tube 1 is a flexible stainless steel tube integrally formed.

[0177] For example, there is one valve connector 2, which is a stainless steel pipe. By making the main body pipe 1 also a stainless steel pipe, the valve connector 2 can be directly welded to the main body pipe 1. The welding method can be brazing or fusion welding. Brazing can be flame welding or high-frequency welding. The welding method is simple and convenient, which can reduce the indirect welding between the valve connector 2 and the main body pipe 1 through the copper sleeve, reduce the use of the copper sleeve and simplify the welding process, thereby reducing the welding cost.

[0178] In one example, the flux used for welding between the flexible stainless steel main tube 1 and the flexible stainless steel valve fitting 2 may contain, by weight, 60%-80% boric acid, 5%-15% fluoride, and 10%-20% potassium borate. The solder, by weight, contains 46%-50% Cu, 9%-11% Ni, and 0.04%-0.25% Si, with the remainder consisting of Zn and unavoidable impurities.

[0179] For example, multiple valve connectors are provided. Some of the valve connectors can be copper pipes or copper alloy pipes. The valve connectors and the main body pipe 1 can also be directly fixedly connected by welding. The welding method can be brazing or fusion welding. Brazing can be flame welding or high-frequency welding. The welding method is simple and convenient, which can reduce the indirect welding between the valve connectors and the main body pipe 1 through copper sleeves, reduce the use of copper sleeves and simplify the welding process, thereby reducing welding costs.

[0180] In one example, the flux used for welding between the flexible stainless steel body tube 1 and the copper or copper alloy valve fitting may contain, by weight, 60%-80% boric acid, 5%-15% fluoride, and 10%-20% potassium borate. The solder, by weight, contains 57%-61% Cu, 1.0%-1.5% Sn, 0.05%-0.2% Si, with the remainder consisting of Zn and unavoidable impurities.

[0181] For example, the valve unit includes multiple valve connectors, each of which is a valve connector 2. By making the main body tube 1 also a stainless steel tube, the valve connectors and the main body tube 1 can be integrally formed, which can reduce the welding between the valve connectors and the main body tube 1, and improve the connection strength and sealing performance between the valve connectors and the main body tube 1. Furthermore, flexible stainless steel is less expensive than copper, thereby reducing the production cost of the valve unit.

[0182] According to an example of this application, as shown in Figures 1 and 2, the first connecting pipe 201 is a straight pipe, which facilitates welding between the first connecting pipe 201 and the main pipe 1.

[0183] Optionally, the valve unit is a four-way valve 10, and the valve connecting pipe is provided with four valve pipes, namely a first valve pipe 21, a second valve pipe 22, a third valve pipe 23 and a fourth valve pipe 24. For example, the first valve pipe 21, the second valve pipe 22, the third valve pipe 23 and the fourth valve pipe 24 are all valve connecting pipes 2, that is, the first valve pipe 21, the second valve pipe 22, the third valve pipe 23 and the fourth valve pipe 24 all have a bent pipe 3, and the four bent pipes 3 are respectively the first bent pipe, the second bent pipe, the third bent pipe and the fourth bent pipe. In other words, in the valve unit of this application, the main body pipe 1 is connected to four integrally formed flexible stainless steel components, each of which includes a bent pipe 3. Thus, the valve unit can be a four-way valve 10. The four bent pipes 3 of the four-way valve 10 enable the four-way valve 10 to better communicate with the components within the heat source unit 5000, and also optimize the layout of the components within the heat source unit 5000. Furthermore, the four valve connecting pipes 2 of the four-way valve 10 can reduce the welding process of the valve unit, and also improve the structural strength and sealing performance of the valve unit. Moreover, flexible stainless steel is less expensive than copper, thereby reducing the production cost of the valve unit.

[0184] Optionally, the main tube 1 can be a stainless steel tube, and the main tube 1 is welded to four integral parts formed by flexible stainless steel. The welding method between the flexible stainless steel can be brazing or fusion welding as described in the above example, and the solder and flux can also be the same as those used when welding between the flexible stainless steel in the above example, which will not be elaborated here.

[0185] Optionally, the main tube 1 can be a copper tube or a copper alloy tube. The main tube 1 is welded to four integrated parts integrally formed from flexible stainless steel. The welding method between copper or copper alloy and flexible stainless steel can be brazing or fusion welding as described in the above example. The solder and flux can also be the same solder and flux used when welding flexible stainless steel to flexible stainless steel as described in the above example. This application will not elaborate on this.

[0186] According to an example of this application, as shown in Figures 1-3, a portion of the valve connector 2' includes a third connecting pipe 201' and a fourth connecting pipe 202'. The third connecting pipe 201' is located between the main pipe and the fourth connecting pipe 202', and the fourth connecting pipe 202' is connected to an external piping. The third connecting pipe 201' and the fourth connecting pipe 202' are both straight pipes, and both are flexible stainless steel pipes, which are directly welded together.

[0187] For example, four valve connectors are provided. Two of the four valve connectors are valve connectors 2 with bent pipes 3, and the other two valve connectors are second valve connectors 2' with straight pipes 4. Thus, the main body pipe 1 is connected to four integrated parts integrally formed of flexible stainless steel. By having both bent pipes 3 and straight pipes 4 on the valve unit, the flexibility of the valve unit can be improved, and the layout of the components in the heat source unit 5000 can be better optimized.

[0188] Furthermore, it is understandable that regardless of whether the valve unit has only a bent pipe 3, only a straight pipe 4, or both a bent pipe 3 and a straight pipe 4, the valve connecting pipe is shorter than that of the four-way valve in the related art. In order to adapt to the layout of the components inside the heat source unit 5000, a transition pipe needs to be connected when connecting the components to the pipes. This application directly constructs a valve connecting pipe 2 and a second valve connecting pipe 2', which are longer in length. This can reduce welding between pipes, improve the sealing between pipes, and also improve the flexibility of the valve unit while reducing costs.

[0189] According to one example of this application, the end of the second connecting pipe 202 away from the first connecting pipe 201 is provided with a first retractable portion, the outer diameter of which is smaller than the outer diameter of the first connecting pipe 201; or, the end of the second connecting pipe 202 away from the first connecting pipe 201 is provided with a first expanding portion, the outer diameter of which is larger than the outer diameter of the first connecting pipe 201; and / or, the end of the fourth connecting pipe 202' away from the third connecting pipe 201' is provided with a second retractable portion, the outer diameter of which is smaller than the outer diameter of the third connecting pipe 201'; or, the end of the fourth connecting pipe 202' away from the third connecting pipe 201' is provided with a second expanding portion, the outer diameter of which is larger than the outer diameter of the third connecting pipe 201'.

[0190] As shown in Figure 4, one end of the bent tube 3 is provided with a retraction part 51 (i.e., the first retraction part or the second retraction part), the outer diameter of the retraction part 51 is smaller than the outer diameter of the bent tube 3; the other end of the bent tube 3 is provided with an expansion part 52 (i.e., the second expansion part or the second expansion part), the outer diameter of the expansion part 52 is larger than the outer diameter of the bent tube 3.

[0191] Taking the bent pipe 3 as an example, an expansion section 52 can be constructed at the opening of the bent pipe 3. The pipe of the component can be inserted into the expansion section 52 and then fixedly connected by welding. After the pipe of the component is inserted into the expansion section 52, since the outer diameter of the expansion section 52 is different from the outer diameter of the bent pipe 3, the pipe of the component can be better limited. Therefore, the welding of the bent pipe 3 and the pipe of the component has good stability. Similarly, a retractable section 51 can be constructed at the opening of the bent pipe 3. The retractable section 51 can be inserted into the pipe of the component. Since the outer diameter of the retractable section 51 is different from the outer diameter of the bent pipe 3, the pipe of the component can be better limited. Therefore, the welding of the bent pipe 3 and the pipe of the component has good stability.

[0192] In addition, the bent tube 3 is a flexible stainless steel tube. When manufacturing the expansion part 52 or the retraction part 51, the stainless steel tube has good ductility. Therefore, the opening of the bent tube 3 can be expanded or reduced in one step, which is simple and convenient. The end of the bent tube 3 is not prone to deformation or cracks.

[0193] The above example uses the bent pipe 3 as an example. It can be understood that the opening of the straight pipe 4 can also be constructed with an expansion section 52 or a retraction section 51, which will not be elaborated here.

[0194] According to one example of this application, in the direction from the first connecting pipe 201 to the second connecting pipe 202, the outer diameter of the first retracted portion gradually decreases, or the outer diameter of the first expanded portion gradually increases; and / or, in the direction from the third connecting pipe 201' to the fourth connecting pipe 202', the outer diameter of the second retracted portion gradually decreases, or the outer diameter of the second expanded portion gradually increases.

[0195] For example, the retraction section 51 includes a plurality of sub-retraction sections connected in sequence, and the outer diameter of the plurality of sub-retraction sections decreases in sequence; or, the expansion section 52 includes a plurality of sub-expansion sections connected in sequence, and the outer diameter of the plurality of sub-expansion sections increases in sequence.

[0196] Taking the retraction section 51, which includes multiple sub-retraction sections, as an example, the flow state transition of fluid between pipes with different outer diameters can be smoothed through multiple sub-retraction sections with progressively decreasing outer diameters. This reduces eddies and energy losses caused by the abrupt change from a pipe with a large outer diameter to a pipe with a small outer diameter, effectively reducing fluid resistance and noise. Furthermore, the gradually changing outer diameter of the multiple sub-retraction sections can act as stress dispersion zones when subjected to high pressure or vibration environments, preventing pipe damage or rupture caused by stress concentration.

[0197] Similarly, taking the expansion section 52 as an example, which includes multiple sub-expansion sections, the flow state transition of fluid between pipes with different outer diameters can be smoothed through multiple sub-expansion sections with progressively increasing outer diameters. This reduces eddies and energy losses caused by the abrupt change from a small outer diameter pipe to a large outer diameter pipe, effectively reducing fluid resistance and noise. Furthermore, the multiple sub-expansion sections with gradually changing outer diameters can act as stress dispersion zones when subjected to high pressure or vibration environments, preventing pipe damage or rupture caused by stress concentration.

[0198] According to an example of this application, as shown in Figure 4, the bent pipe 3 includes a first straight pipe section 301, a bent section 303, and a second straight pipe section 302 connected in sequence. The first straight pipe section 301 and the second straight pipe section 302 are arranged in parallel. The bending radius r of the bent section 303 and the outer diameter d of the first straight pipe section 301 satisfy the following condition: 1.2d ≤ r ≤ 1.5d; the bending radius r of the bent section 303 and the outer diameter d of the second straight pipe section 302 satisfy the following condition: 1.2d ≤ r ≤ 1.5d. Therefore, by making the bent pipe 3 meet the above conditions, space can be saved effectively, and the arrangement of the heat source unit 5000 can be optimized.

[0199] The bending section 303 includes at least 2-4% Wt of Cu, and / or the yield strength of the bending section 303 is 140-180 MPa, and / or the hardness of the bending section 303 is 90-120 Hv. Compared to existing 304L stainless steel pipes, the flexible stainless steel of this embodiment, by including at least 2-4% Wt of Cu, reduces the yield strength of the stainless steel material by 140-180 MPa and the hardness by 90-120 Hv. Therefore, in the pipe bending process, the flexible stainless steel containing 2-4% Wt of Cu not only achieves a smaller lower limit of the bending radius, but also, during high-speed pipe bending, the flattening offset of the flexible stainless steel containing 2-4% Wt of Cu is less than that of existing 304L stainless steel.

[0200] According to an example of the heat source unit 5000 of this application, by making the first connecting pipe 201 and the second connecting pipe 202 integrally formed by flexible stainless steel, the welding process between the first connecting pipe 201 and the second connecting pipe 202 can be reduced, and the connection strength and sealing performance between the first connecting pipe 201 and the second connecting pipe 202 can be improved. Furthermore, flexible stainless steel is less expensive than copper, thereby reducing the production cost of the valve unit.

[0201] According to an example of this application, the valve unit is a four-way valve, which includes a first valve pipe 21, a second valve pipe 22, a third valve pipe 23, and a fourth valve pipe 24. The heat source unit 5000 also includes a compressor 200, a first outlet pipe 700, and a second outlet pipe 600. The first valve pipe 21 is connected to the exhaust pipe 300 of the compressor 200, the second valve pipe 22 is connected to the first suction pipe 400 of the compressor 200, the third valve pipe 23 is connected to the first outlet pipe 700, and the fourth valve pipe 24 is connected to the second outlet pipe 600. At least one of the first valve pipe 21, the second valve pipe 22, the third valve pipe 23, and the fourth valve pipe 24 is a valve connecting pipe 2.

[0202] As shown in Figures 1-5 and 9-13, the valve unit is a four-way valve 10, with four valve connecting pipes: a first valve pipe 21, a second valve pipe 22, a third valve pipe 23, and a fourth valve pipe 24. The heat source unit 5000 also includes a compressor 200, a first outlet pipe 700, and a second outlet pipe 600. The first valve pipe 21 is connected to the exhaust pipe 300 of the compressor 200, the second valve pipe 22 is connected to the first suction pipe 400 of the compressor 200, the third valve pipe 23 is connected to the first outlet pipe 700, and the fourth valve pipe 24 is connected to the second outlet pipe 600. Any one of the first valve pipe 21, second valve pipe 22, third valve pipe 23, or fourth valve pipe 24 of the four-way valve 10 can be used as the valve connecting pipe 2. This reduces the welding process between the valve connecting pipe and the bent pipe 3, improves the connection strength and sealing performance between them, and, moreover, flexible stainless steel is less expensive than copper, thus reducing the production cost of the valve unit.

[0203] According to one example of this application, the exhaust pipe 300 and the first valve pipe 21 are both integrally formed flexible stainless steel pipes, and are welded together by a first solder 91; and / or, the first intake pipe 400 and the second valve pipe 22 are both integrally formed flexible stainless steel pipes, and are welded together by a first solder 91; and / or, the first outlet pipe 700 and the third valve pipe 23 are both integrally formed flexible stainless steel pipes, and are welded together by a first solder 91; and / or, the second outlet pipe 600 and the fourth valve pipe 24 are both integrally formed flexible stainless steel pipes. The integrally formed stainless steel pipe, the second outlet pipe 600 and the fourth valve pipe 24 are welded together by a first solder 91, wherein the first solder 91 contains, by weight, Cu: 46%-50%, Ni: 9%-11%, Si: 0.04%-0.25%, with the remainder consisting of Zn and unavoidable impurities; the flux used when using the first solder 91 contains, by weight, 60%-80% boric acid, 5%-15% fluoride, and 10%-20% potassium borate; the melting temperature t1 when using the first solder 91 satisfies: 910℃≤t1≤935℃; the brazing temperature t2 when using the first solder 91 satisfies: 950℃≤t2≤975℃.

[0204] According to one example of this application, one of the exhaust pipe 300 and the first valve pipe 21 is a flexible stainless steel pipe integrally formed, and the other is a copper pipe or a copper alloy pipe. The exhaust pipe 300 and the first valve pipe 21 are welded together by a second solder 92. And / or, one of the first intake pipe 400 and the second valve pipe 22 is a flexible stainless steel pipe integrally formed, and the other is a copper pipe or a copper alloy pipe. The first intake pipe 400 and the second valve pipe 22 are welded together by a second solder 92. And / or, one of the first outlet pipe 700 and the third valve pipe 23 is a flexible stainless steel pipe integrally formed, and the other is a copper pipe or a copper alloy pipe. The first outlet pipe 700 and the third valve pipe 23 are welded together by a second solder 92. And / or, the second outlet pipe 600... One of the four valve tubes 24 is a flexible stainless steel tube integrally formed, and the other is a copper tube or copper alloy tube. The second outlet tube 600 and the fourth valve tube 24 are welded together by a second solder 92. The second solder 92 contains, by weight, Cu: 57%-61%, Sn: 1.0%-1.5%, Si: 0.05%-0.2%, with the remainder consisting of Zn and unavoidable impurities. The flux used when using the second solder 92 contains, by weight, 60%-80% boric acid, 5%-15% fluoride, and 10%-20% potassium borate. The melting temperature t1 when using the second solder 92 satisfies: 880℃≤t1≤890℃. The brazing temperature t2 when using the second solder 92 satisfies: 920℃≤t2≤930℃.

[0205] The gas-side shut-off valve 20b and the liquid-side shut-off valve 20a are made of flexible stainless steel.

[0206] According to an example of this application, the gas-side shut-off valve 20b and the liquid-side shut-off valve 20a include shut-off valve tubes. The shut-off valve tubes are integrally formed stainless steel tubes made of flexible stainless steel. The shut-off valve tubes are welded to the first piping 62. That is, both the shut-off valve tubes and the first piping 62 are made of flexible stainless steel. Therefore, the shut-off valve tubes and the first piping 62 can be directly welded together. The welding method can be brazing or fusion welding. Brazing can be flame welding or high-frequency welding. The welding method is simple and convenient, which can reduce the indirect welding between the shut-off valve tubes and the first piping 62 through copper sleeves. This can reduce the use of copper sleeves and simplify the welding process, thereby reducing welding costs.

[0207] In one example, the flux used for welding between the flexible stainless steel body pipe 1 and the flexible stainless steel valve fitting may consist of, by mass percent, 60%-80% boric acid, 5%-15% fluoride, and 10%-20% potassium borate. The solder, by mass percent, contains Cu: 57%-61%, Sn: 1.0%-1.5%, Si: 0.05%-0.2%, with the remainder consisting of Zn and unavoidable impurities.

[0208] According to one example of this application, the gate valve 20 includes a gate valve tube, which is a flexible stainless steel tube integrally formed. Optionally, the first piping 62 welded to the gate valve 20 is also a flexible stainless steel tube integrally formed. The gate valve 20 and the first piping 62 can be directly welded between flexible stainless steel components, which is simple and convenient. In one example, the gate valve 20 and the first piping 62 are integrally formed integrated components, and this application does not impose any limitations.

[0209] In one example, the shut-off valve 20 includes a shut-off valve tube, which is a flexible stainless steel tube integrally formed. Optionally, the first tube structure 30 is a flexible stainless steel component, and the shut-off valve tube and the first tube structure 30 are an integrated component integrally formed from flexible stainless steel.

[0210] According to an example of this application, the valve connector of the four-way valve 10 has a sleeve welded to its port, which is a first sleeve 87. The first sleeve 87 is a copper sleeve or a copper alloy sleeve. That is to say, the valve connector can be indirectly welded to other pipelines through the first sleeve 87. For example, the valve connector is a third valve pipe 23, which can be indirectly welded to the first piping 62. That is, the first sleeve 87 is welded to the port of the third valve pipe 23, and then the first piping 62 can be welded to the first sleeve 87, thereby realizing the welded connection between the third valve pipe 23 and the first piping 62. Of course, the valve connector can also be a first valve pipe 21, a second valve pipe 22, or a fourth valve pipe 24. This application does not impose any restrictions.

[0211] According to an example of this application, a sleeve, namely a second sleeve 88, is welded to the end of the first pipe structure 30 facing the four-way valve 10. The second sleeve 88 is a copper pipe or a copper alloy pipe. That is, the second sleeve 88 is welded to the end of the first pipe 62, so the first pipe 62 and the third valve pipe 23 can be indirectly welded together through the second sleeve 88. Alternatively, the first sleeve 87 can also be welded to the end of the third valve pipe 23. In this way, the second sleeve 88 can be pre-welded to the end of the first pipe 62, and the first sleeve 87 can be welded to the end of the third valve pipe 23. Then, the welding connection between the first pipe 62 and the third valve pipe 23 is achieved by welding the first sleeve 87 and the second sleeve 88.

[0212] According to one example of this application, the first pipe structure 30 has a sleeve welded to its port facing the shut-off valve 20, which is a third sleeve. The third sleeve is a copper pipe or a copper alloy pipe. That is, the second pipe 63 has a third sleeve welded to its port, and the second pipe 63 and the shut-off valve 20 can be indirectly welded together through the third sleeve.

[0213] According to one example of this application, the valve port of the shut-off valve 20 is welded with a fourth sleeve, which is a copper pipe or a copper alloy pipe. Thus, the shut-off valve 20 and the second piping 63 are indirectly welded together through the fourth sleeve. Alternatively, the valve port of the second piping 63 is welded with a third sleeve. In this way, the fourth sleeve can be pre-welded to the valve port of the shut-off valve 20, and the third sleeve can be pre-welded to the valve port of the second piping 63. The welding connection between the second piping 63 and the shut-off valve 20 is then achieved through the welding between the third sleeve and the fourth sleeve.

[0214] According to an example of this application, the first pipe structure 30 includes a filter 61 and a first pipe 62 and a second pipe 63 connected to both ends of the filter 61. Both the first pipe 62 and the second pipe 63 are stainless steel pipes. The first pipe 62 has at least one bend with a bending radius of r. The outer diameter d of either the first pipe 62 or the second pipe 63 satisfies: 1.2d ≤ r ≤ 1.5d. Therefore, by ensuring that the bend pipe 3 meets the above conditions, space can be saved effectively, and the arrangement of the heat source unit 5000 can be optimized.

[0215] In the first example of this application, the four-way valve assembly 100 includes a first welded tube 81 and a second welded tube 82 welded together. Both the first welded tube 81 and the second welded tube 82 are made of flexible stainless steel. The first welded tube 81 and the second welded tube 82 are welded together by a first solder 91. The first solder 91 contains, by weight, Cu: 46%–50%, Ni: 9%–11%, Si: 0.04%–0.25%, with the remainder consisting of Zn and unavoidable impurities. The flux used when using the first solder 91 contains, by weight, 60%–80% boric acid, 5%–15% fluoride, and 10%–20% potassium borate. The melting temperature t1 when using the first solder 91 satisfies: 910℃≤t1≤935℃. The brazing temperature t2 when using the first solder 91 satisfies: 950℃≤t2≤975℃.

[0216] In the second example of this application, the four-way valve assembly 100 includes a third welded tube 83 and a fourth welded tube 84 welded together. The third welded tube 83 is a flexible stainless steel tube integrally formed, and the fourth welded tube 84 is a copper tube or a copper alloy tube. The third welded tube 83 and the fourth welded tube 84 are welded together by a second solder 92. The second solder 92 contains, by weight, Cu: 57%-61%, Sn: 1.0%-1.5%, Si: 0.05%-0.2%, with the remainder consisting of Zn and unavoidable impurities. The flux used when using the second solder 92 contains, by weight, 60%-80% boric acid, 5%-15% fluoride, and 10%-20% potassium borate. The melting temperature t1 when using the second solder 92 satisfies: 880℃≤t1≤890℃. The brazing temperature t2 when using the second solder 92 satisfies: 920℃≤t2≤930℃.

[0217] In the third example of this application, the four-way valve assembly 100 includes a fifth welded pipe 85 and a sixth welded pipe 86 welded together. The fifth welded pipe 85 has a first sleeve 87 welded to its end, and the sixth welded pipe 86 has a second sleeve 88 welded to its end. The first sleeve 87 and the second sleeve 88 are welded together by a third solder 93 or a fourth solder 94. The first sleeve 87 is a copper sleeve or a copper alloy sleeve; the second sleeve 88 is a copper sleeve or a copper alloy sleeve; the third solder 93 is a tin bronze solder; and the fourth solder 94 is a silver copper solder.

[0218] For the three examples above, the first welded pipe 81, the second welded pipe 82, the third welded pipe 83, the fourth welded pipe 84, the fifth welded pipe 85, and the sixth welded pipe 86 can be any pipe body in the four-way valve assembly 100. For example, the first welded pipe 81 is a shut-off valve pipe, and the second welded pipe 82 is a first piping; for example, the first welded pipe 81 is a valve connecting pipe, and the second welded pipe 82 is a second piping. Only two examples are given here for illustration and should not be used as a limitation of this application. In addition, this application will not elaborate on the examples of other pipe bodies.

[0219] According to an example of this application, referring to Figures 1-19, one or both ends of the first suction pipe 400 and / or the second suction pipe 401 are connected to external piping. The first suction pipe 400, the second suction pipe 401, and the external piping are all integrally formed flexible stainless steel pipes. The first suction pipe 400 and the external piping, and the second suction pipe 401 and the external piping are welded together by a first solder 91, wherein the first solder 91 contains Cu of 46% to 50% by weight. Ni: 9%–11%, Si: 0.04%–0.25%, with the remainder consisting of Zn and unavoidable impurities; the flux used when using the first solder 91 contains 60%–80% boric acid, 5%–15% fluoride, and 10%–20% potassium borate, calculated as Wt%; the melting temperature t1 when using the first solder 91 satisfies: 910℃≤t1≤935℃; the brazing temperature t2 when using the first solder 91 satisfies: 950℃≤t2≤975℃.

[0220] Specifically, for brazing, flame welding or high-frequency welding technology can be selected, which results in a wider welding activity range, less post-weld residue, stronger corrosion resistance and better reliability at the weld, and a significant reduction in welding costs; the welding temperature requirement is low, making it less likely to burn the base material; the solder has good fluidity and filling properties, allowing for more relaxed requirements on pipe diameter and fitting clearance, high stability and strong reliability; and it does not require an ammonia decomposition furnace, thus requiring lower processing precision.

[0221] The return pipe and external piping can be welded using brazing or fusion welding techniques with the first solder 91 and flux. For brazing, flame welding or high-frequency welding techniques can be selected, and flux is used, which has a wider activity range and less residue after welding. For fusion welding, argon arc welding techniques can be selected, with the weld position 0cm to 2cm from the interface, the weld width 2mm to 10mm, and the weld strength not less than 80% of the base material. It has more relaxed requirements on the weld position and the size of the weld area.

[0222] According to an example of this application, referring to Figures 1-19, one or both ends of the first suction pipe 400 and / or the second suction pipe 401 are connected to external pipes. The first suction pipe 400 and the second suction pipe 401 are both integrally formed stainless steel pipes made of flexible stainless steel. The external pipes are copper pipes or copper alloy pipes. The first suction pipe 400 and the external pipes, and the second suction pipe 401 and the external pipes are welded together by a second solder 92.

[0223] The second solder 92 contains, by weight (wt%), Cu: 57%-61%, Sn: 1.0%-1.5%, Si: 0.05%-0.2%, with the remainder consisting of Zn and unavoidable impurities; the flux used when using the second solder 92 contains, by weight (wt%), 60%-80% boric acid, 5%-15% fluoride, and 10%-20% potassium borate; the melting temperature t3 when using the second solder 92 satisfies: 880℃≤t1≤890℃; the brazing temperature t4 when using the second solder 92 satisfies: 920℃≤t2≤930℃.

[0224] It is understandable that when the materials of the first intake pipe 1011 and the external pipe are different, the solder required for welding the first intake pipe 1011 and the external pipe will also be different.

[0225] Flexible stainless steel is a type of stainless steel material with high ductility and flexibility. It can adapt to complex shape changes and bending requirements without losing its corrosion resistance and mechanical strength. Even after a complex forming process, it can still maintain good mechanical strength and compressive strength. Flexible stainless steel is easy to process by bending, welding and connecting.

[0226] According to an example of this application, as shown in Figures 1-3 and 9-14, the compressor assembly 1000 further includes a four-way valve 10. The four-way valve 10 includes a main body pipe 1 and four valve connecting pipes 2. The four valve connecting pipes of the four-way valve 10 are a first valve pipe 21, a second valve pipe 22, a third valve pipe 23, and a fourth valve pipe 24. The first valve pipe 21 is connected to the first exhaust pipe 300, the second valve pipe 22 is connected to the first intake pipe 400, the third valve pipe 23 is connected to the first outlet pipe 700, and the fourth valve pipe 24 is connected to the second outlet pipe 600. At least one of the first valve pipe 21, the second valve pipe 22, the third valve pipe 23, and the fourth valve pipe 24 is a flexible stainless steel pipe.

[0227] As shown in Figures 1-3 and 9-14, at least one of the first valve tube 21, the second valve tube 22, the third valve tube 23 and the fourth valve tube 24 has a bent tube 3 connected to its other end. The bent tube 3 is a flexible stainless steel tube.

[0228] As shown in Figures 1-3 and 9-14, in one example, the other end of the first valve pipe 21 is connected to the exhaust pipe 300 of the compressor 200, and the bent pipe 3 is connected between the first valve pipe 21 and the exhaust pipe 300; the other end of the second valve pipe 22 is connected to the first suction pipe 400 of the compressor 200, and the bent pipe 3 is connected between the second valve pipe 22 and the first suction pipe 400; the other end of the third valve pipe 23 is connected to the first outlet pipe 700, and the bent pipe 3 is connected between the third valve pipe 23 and the first outlet pipe 700; the other end of the fourth valve pipe 24 is connected to the second outlet pipe 600, and the bent pipe 3 is connected between the fourth valve pipe 24 and the second outlet pipe 600.

[0229] Optionally, the outer diameter of the valve pipe connected to the bent pipe 3 is d, and the bending radius of the bent pipe 3 is r, satisfying: 1.2d≤r≤1.5d.

[0230] According to one example of this application, at least one of the first valve pipe 21, the second valve pipe 22, the third valve pipe 23 and the fourth valve pipe 24 has a sleeve welded to its opening, and the sleeve is a copper sleeve or a copper alloy sleeve.

[0231] According to one example of this application, a sleeve is welded to the end of the exhaust pipe 300 facing the four-way valve 10. The sleeve is a copper sleeve or a copper alloy sleeve.

[0232] According to one example of this application, a sleeve is welded to the end of the first intake pipe 400 facing the four-way valve 10. The sleeve is a copper sleeve or a copper alloy sleeve.

[0233] Optionally, all pipelines in this application, regardless of whether they are made of flexible stainless steel, can have sleeves welded at the pipe ends. The sleeves can be copper sleeves or copper alloy sleeves, so that when welding two adjacent pipelines, indirect welding can be performed through the sleeves. When two adjacent pipelines are both made of flexible stainless steel, the sleeves can be selected or not selected depending on the actual situation. If the sleeves are not selected, the flexible stainless steel can be directly welded to the flexible stainless steel. The welding method can be brazing. The solder and flux have been described in the above examples and will not be repeated here.

[0234] According to one example of this application, the four-way valve 10 is a flexible stainless steel valve.

[0235] According to an example of this application, as shown in Figures 14 and 17, the compressor assembly includes a first welded tube 81 and a second welded tube 82 welded together. Both the first welded tube 81 and the second welded tube 82 are made of flexible stainless steel. The first welded tube 81 and the second welded tube 82 are welded together by a first solder 91, wherein the first solder 91 contains, by weight, Cu: 46%–50%, Ni: 9%–11%, Si: 0.04%–0.25%, with the remainder consisting of Zn and unavoidable impurities; the flux used when using the first solder 91 contains, by weight, 60%–80% boric acid, 5%–15% fluoride, and 10%–20% potassium borate; the melting temperature t1 when using the first solder 91 satisfies: 910℃≤t1≤935℃; the brazing temperature t2 when using the first solder 91 satisfies: 950℃≤t2≤975℃.

[0236] According to an example of this application, as shown in Figures 15 and 18, the compressor assembly includes a third welded tube 83 and a fourth welded tube 84 welded together. The third welded tube 83 is a flexible stainless steel tube integrally formed, and the fourth welded tube 84 is a copper tube or a copper alloy tube. The third welded tube 83 and the fourth welded tube 84 are welded together by a second solder 92. The second solder 92 contains, by weight, Cu: 57%-61%, Sn: 1.0%-1.5%, Si: 0.05%-0.2%, with the remainder consisting of Zn and unavoidable impurities. The flux used when using the second solder 92 contains, by weight, 60%-80% boric acid, 5%-15% fluoride, and 10%-20% potassium borate. The melting temperature t1 when using the second solder 92 satisfies: 880℃≤t1≤890℃. The brazing temperature t2 when using the second solder 92 satisfies: 920℃≤t2≤930℃.

[0237] According to an example of this application, as shown in Figures 13 and 16, the compressor assembly includes a fifth welded tube 85 and a sixth welded tube 86 welded together. The end of the fifth welded tube 85 is welded with a first sleeve 87, and the end of the sixth welded tube 86 is welded with a second sleeve 88. The first sleeve 87 and the second sleeve 88 are welded together by a third solder 93 or a fourth solder 94, wherein the first sleeve 87 is a copper sleeve or a copper alloy sleeve; the second sleeve 88 is a copper sleeve or a copper alloy sleeve; the third solder 93 is a tin bronze solder; and the fourth solder 94 is a silver copper solder.

[0238] For the three examples above, the first welded pipe 81, the second welded pipe 82, the third welded pipe 83, the fourth welded pipe 84, the fifth welded pipe 85, and the sixth welded pipe 86 can be any pipe body in the compressor assembly 1000. For example, the first welded pipe 81 is a shut-off valve pipe, and the second welded pipe 82 is a first piping; for example, the first welded pipe 81 is a valve connecting pipe, and the second welded pipe 82 is a second piping. Only two examples are given here for illustration and should not be used as a limitation of this application. In addition, this application will not elaborate on the examples of other pipe bodies.

[0239] According to an example of this application, referring to Figures 1-19, one or both ends of the first intake pipe 400 and / or the second intake pipe 401 are connected to external piping. One or both ends of the first intake pipe 400 and / or the second intake pipe 401 are provided with a first sleeve 87. The end of the external piping near the first intake pipe 1011 is provided with a second sleeve 88. The first sleeve 87 and the second sleeve 88 are welded together by a third solder 53 or a fourth solder 54. The first sleeve 87 and the second sleeve 88 are both copper pipes or copper alloy pipes; the third solder 53 is tin bronze solder; and the fourth solder 54 is silver copper solder.

[0240] According to an example of this application, referring to Figures 1-19, a first sleeve 87 is welded to one end of the first intake pipe 400 and the second intake pipe 401, and a second sleeve 88 is provided at the end of the external piping near the first intake pipe 400 or the second intake pipe 401. The first sleeve 87 and the second sleeve 88 are copper pipes or copper alloy pipes. Through the bridging effect of the first sleeve 87 and the second sleeve 88, and by adjusting the model of the first sleeve 87 and the second sleeve 88 of the external piping, the model of the first sleeve 87 can be adapted to match the model of the second sleeve 88 of the external piping, thus realizing the connection between the first intake pipe 400 or the second intake pipe 401 and different models of external piping, thereby reducing the difficulty of product design. When the return pipe 10 is assembled into the equipment, the external piping is connected to the components on the equipment. During the product design process, the size or shape of the external piping can be adjusted, so that the return pipe 10 can be adapted to more models of equipment.

[0241] In a specific example, when welding the return gas pipe 10 to the external piping, if the external piping is also made of stainless steel, the return gas pipe 10 is directly welded to the external piping. The welding of the return gas pipe 10 to the external piping uses brazing or fusion welding techniques with solder and flux. For brazing, flame welding or high-frequency welding can be selected, using flux, which has a wider activity range and less residue after welding. For fusion welding, argon arc welding can be selected, with the weld position 0cm to 2cm from the interface, the weld width 2mm to 10mm, and the weld strength not less than 80% of the base material. It has more relaxed requirements on the weld position and the size of the weld area.

[0242] For example, the composition and mass percentage of the solder for welding stainless steel pipes are as follows: Cu: 46%-50%, Ni: 9%-11%, Si: 0.04%-0.25%, with the remainder being Zn; melting temperature range: 910℃-935℃; recommended brazing temperature: 950℃-975℃. The composition and mass percentage of the flux are as follows: boric acid: 60%-80%, fluoride: 5%-15%, potassium borate: 10%-20%.

[0243] This application also proposes a heat source unit 5000.

[0244] According to an example of the heat source unit 5000 of this application, by providing the four-way valve assembly 100 of the above embodiment, by making at least a portion of the first pipe structure 30 a flexible stainless steel part, the first pipe structure 30 can be bent or the local structural strength of the first pipe structure 30 can be improved according to actual needs, or the welding difficulty of the first pipe structure 30 can be reduced, thereby improving the welding efficiency of the first pipe structure 30.

[0245] According to an example of the heat source unit 5000 of this application, by providing the compressor assembly 1000 of the above embodiment, and by making the exhaust pipe 300 or the first suction pipe 400 a stainless steel pipe, the exhaust pipe 300 or the first suction pipe 400 can be bent and extended in a better way, so that the exhaust pipe 300 or the first suction pipe 400 can save space and optimize the arrangement of the heat source unit 5000. Furthermore, since the exhaust pipe 300 or the first suction pipe 400 still has good mechanical strength and pressure resistance after bending, it can stably transport the refrigerant medium, which is beneficial to the stability of the operation of the compressor 200 and the heat source unit 5000.

[0246] Other configurations and operations of the valve unit, four-way valve assembly 100, compressor assembly 1000, and heat source unit 5000 according to an example of this application are known to those skilled in the art and will not be described in detail here.

[0247] According to one example of this application, the four-way valve assembly 100 or the compressor assembly 1000 can also be used in heat pumps, refrigerators and other thermal management products, and this application does not impose any restrictions.

[0248] The stainless steel pipe involved in this application has significantly higher mechanical properties than copper, thus greatly increasing the possibility of using high-pressure flammable new refrigerants in piping compared to copper pipes.

[0249] The stainless steel pipe involved in this application has significantly higher mechanical properties than copper, and therefore can withstand stronger high-frequency vibrations caused by the compressor 200 and refrigerant impact compared to copper pipes.

[0250] The stainless steel pipe involved in this application has significantly higher mechanical properties than copper, so the pipe wall thickness can be reduced by 10-30% compared to copper pipe in the same application scenario.

[0251] The stainless steel pipe involved in this application has a lower wall thickness than the copper pipe in the same application scenario, while the outer diameter remains the same. Therefore, the refrigerant flow channel diameter is larger and the pressure loss of refrigerant circulation is lower.

[0252] The stainless steel pipe involved in this application has a lower pitting corrosion potential, lower pitting corrosion weight loss and lower martensitic transformation temperature due to the addition of Cr and Ni elements. This makes it more difficult for the stainless steel pipe to undergo martensitic phase transformation during processing, thereby achieving stronger resistance to pitting corrosion and stress corrosion, and it can be directly flame welded without annealing.

[0253] The flexible stainless steel pipe involved in this application has a lower carbon content, making it more difficult for it to pass through the material sensitization range during hot working and welding. This effectively controls the formation of M23C6, thereby achieving stronger resistance to intergranular corrosion and effectively reducing welding defects.

[0254] According to an example of this application, the heat source unit 5000 further includes a third piping, and the compressor assembly has a seventh welded pipe welded to the third piping, wherein both the seventh welded pipe and the third piping are stainless steel pipes made of flexible stainless steel, and the seventh welded pipe and the third piping are welded together by a first solder 91, wherein the first solder 91 contains, by weight, Cu: 46%–50%, Ni: 9%–11%, Si: 0.04%–0.25%, with the remainder consisting of Zn and unavoidable impurities; the flux used when using the first solder 91 contains, by weight, 60%–80% boric acid, 5%–15% fluoride, and 10%–20% potassium borate; the melting temperature t1 when using the first solder 91 satisfies: 910℃≤t1≤935℃; the brazing temperature t2 when using the first solder 91 satisfies: 950℃≤t2≤975℃.

[0255] According to an example of this application, the heat source unit 5000 further includes a fourth piping, and the compressor assembly has an eighth welded pipe welded to the fourth piping. The end of the eighth welded pipe is welded to a third sleeve, and the end of the fourth piping is welded to a fourth sleeve. The third sleeve and the fourth sleeve are welded together by a third solder 93 or a fourth solder 94, wherein the third sleeve is a copper sleeve or a copper alloy sleeve; the fourth sleeve is a copper sleeve or a copper alloy sleeve; the third solder 93 is a tin bronze solder; and the fourth solder 94 is a silver copper solder.

[0256] According to an example of this application, the heat source unit 5000 further includes a fifth piping, and the compressor assembly has a ninth welded pipe welded to the fifth piping. One of the fifth piping and the ninth welded pipe is a flexible stainless steel pipe integrally formed, and the other is a copper pipe or a copper alloy pipe. The fifth piping and the ninth welded pipe are welded together by a second solder 92, wherein the second solder 92 contains, by weight, Cu: 57%-61%, Sn: 1.0%-1.5%, Si: 0.05%-0.2%, with the remainder consisting of Zn and unavoidable impurities; the flux used when using the second solder 92 contains, by weight, 60%-80% boric acid, 5%-15% fluoride, and 10%-20% potassium borate; the melting temperature t1 when using the second solder 92 satisfies: 880℃≤t1≤890℃; the brazing temperature t2 when using the second solder 92 satisfies: 920℃≤t2≤930℃.

[0257] The third, fourth, and fifth pipes, as well as the seventh, eighth, and ninth welded pipes in the above example, can be any of the weldable pipe bodies in the heat source unit 5000 of this application, and this application does not impose any restrictions.

[0258] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.

Claims

1. A compressor assembly (1000), wherein, include: A compressor (200) has an exhaust port (201), a return port (202), an exhaust pipe assembly, and an intake pipe assembly. One end of the exhaust pipe assembly is connected to the exhaust port (201) of the compressor (200), and one end of the intake pipe assembly is connected to the intake port of the compressor (200). At least one of the exhaust pipe assembly and the intake pipe assembly is a stainless steel pipe made of flexible stainless steel, and the material composition of the flexible stainless steel includes at least Cu.

2. The compressor assembly (1000) according to claim 1, wherein, The flexible stainless steel comprises at least copper and nickel, with the following mass percentages: Ni: 9-11%, Cu: 2-4%.

3. The compressor assembly (1000) according to claim 1, wherein, The exhaust pipe assembly is a stainless steel pipe made of the flexible stainless steel, and the exhaust pipe assembly has multiple bending positions, and / or the intake pipe assembly is a stainless steel pipe made of the flexible stainless steel, and the intake pipe assembly has multiple bending positions.

4. The compressor assembly (1000) according to claim 1, wherein, It also includes: a four-way valve assembly (100), which includes a four-way valve (10), a shut-off valve (20) and a first pipe structure (30), wherein the first pipe structure (30) connects the four-way valve (10) and the shut-off valve (20), and at least a portion of the first pipe structure (30) is a flexible stainless steel integrally formed stainless steel part.

5. The compressor assembly (1000) according to claim 4, wherein, The first pipe structure (30) includes a filter (61), and the piping between the filter (61) and the shut-off valve (20) is a first piping (62), which is a stainless steel pipe integrally formed from flexible stainless steel.

6. The compressor assembly (1000) according to claim 5, wherein, The shut-off valve (20) includes a shut-off valve tube, which is a stainless steel tube integrally formed from the flexible stainless steel, and the shut-off valve tube is welded to the first piping (62).

7. The compressor assembly (1000) according to claim 4, wherein, The first pipe structure (30) includes a filter (61), and the piping between the four-way valve (10) and the filter (61) is a second piping (63), which is a stainless steel pipe integrally formed from flexible stainless steel.

8. The compressor assembly (1000) according to claim 7, wherein, The four-way valve (10) includes a valve connector, which is a stainless steel pipe integrally formed from the flexible stainless steel, and the valve connector is welded to the second piping (63).

9. The compressor assembly (1000) according to any one of claims 4-8, wherein, The valve connector of the four-way valve (10) is welded with a sleeve, which is a copper sleeve or a copper alloy sleeve.

10. The compressor assembly (1000) according to any one of claims 4-8, wherein, The first pipe structure (30) has a sleeve welded to the end of the pipe facing the four-way valve (10), and the sleeve is a copper pipe or a copper alloy pipe.

11. The compressor assembly (1000) according to any one of claims 4-8, wherein, The first pipe structure (30) is welded with a sleeve facing the port of the shut-off valve (20), and the sleeve is a copper pipe or a copper alloy pipe.

12. The compressor assembly (1000) according to any one of claims 4-8, wherein, The valve port of the shut-off valve (20) is welded with a sleeve, which is a copper pipe or a copper alloy pipe.

13. The compressor assembly (1000) according to claim 4, wherein, The first pipe structure (30) includes a filter (61) and a first pipe (62) and a second pipe (63) connected to both ends of the filter (61). The first pipe (62) and the second pipe (63) are both stainless steel pipes integrally formed from the flexible stainless steel. The first pipe (62) has at least one bent section with a bending radius of r. The outer diameter d of the first pipe (62) or the second pipe (63) satisfies: 1.2d≤r≤1.5d.

14. The compressor assembly (1000) according to claim 4, wherein, The four-way valve (10) includes a valve connector, and the valve connector and the first pipe structure (30) are integrally formed from the flexible stainless steel.

15. The compressor assembly (1000) according to claim 4, wherein, The shut-off valve (20) includes a shut-off valve tube, and the shut-off valve tube and the first tube structure (30) are integral parts formed by the flexible stainless steel.

16. The compressor assembly (1000) according to claim 1, wherein, It also includes a valve unit, the valve unit comprising: Main tube (1); At least one first valve connector (2), the first valve connector (2) includes a first connecting pipe (201) and a second connecting pipe (202), the first connecting pipe (201) is located between the main pipe (1) and the second connecting pipe (202), the second connecting pipe (202) is connected to an external piping, wherein the second connecting pipe (202) is a bent pipe (3), the first connecting pipe (201) and the second connecting pipe (202) are integrally formed stainless steel pipes of flexible stainless steel, and the composition of the flexible stainless steel includes at least copper.

17. The compressor assembly (1000) according to claim 16, wherein, The outer diameter of the bent tube (3) is d, and the bending radius of the bent tube (3) is r, satisfying: 1.2d≤r≤1.5d.

18. The compressor assembly (1000) according to claim 16, wherein, The second connecting pipe (202) includes a first straight pipe section (301), a bent section (303), and a second straight pipe section (302) connected in sequence. The first straight pipe section (301) and the second straight pipe section (302) are arranged in parallel. The bending radius of the bent section (303) is r. The outer diameter d of the first straight pipe section (301) or the second straight pipe section (302) satisfies: 1.2d≤r≤1.5d.

19. The compressor assembly (1000) according to claim 16, wherein, The main tube (1) is a stainless steel tube integrally formed from flexible stainless steel.

20. The compressor assembly (1000) according to claim 16, wherein, The main tube (1) and the first valve tube (2) are stainless steel parts integrally formed from the flexible stainless steel.

21. The compressor assembly (1000) according to claim 16, wherein, The first connecting pipe (201) is a straight pipe (4).

22. The compressor assembly (1000) according to claim 16, wherein, The valve unit further includes at least one second valve connector (2'), which includes a third connecting pipe (201') and a fourth connecting pipe (202'). The third connecting pipe (201') is located between the main pipe (1) and the fourth connecting pipe (202'), and the fourth connecting pipe (202') is connected to an external piping. The fourth connecting pipe (202') is a straight pipe (4), and the third connecting pipe (201') and the fourth connecting pipe (202') are integrally formed stainless steel pipes of flexible stainless steel.

23. The compressor assembly (1000) according to claim 22, wherein, The third connecting pipe (201') is a straight pipe (4).

24. The compressor assembly (1000) according to claim 22, wherein, The second connecting pipe (202) has a first retractable portion (51) at its end away from the first connecting pipe (201), the outer diameter of which is smaller than the outer diameter of the first connecting pipe (201); or, the second connecting pipe (202) has a first expanding portion (52) at its end away from the first connecting pipe (201), the outer diameter of which is larger than the outer diameter of the first connecting pipe (201); and / or, The fourth connecting pipe (202') has a second retractable portion (51) at the end away from the third connecting pipe (201'), and the outer diameter of the second retractable portion (51) is smaller than the outer diameter of the third connecting pipe (201'); or, the fourth connecting pipe (202') has a second expanding portion (52) at the end away from the third connecting pipe (201'), and the outer diameter of the second expanding portion (52) is larger than the outer diameter of the third connecting pipe (201').

25. The compressor assembly (1000) according to claim 24, wherein, In the direction from the first connecting pipe (201) to the second connecting pipe (202), the outer diameter of the first retractable portion (51) gradually decreases, or the outer diameter of the first expanding portion (52) gradually increases; and / or, In the direction from the third connecting pipe (201') to the fourth connecting pipe (202'), the outer diameter of the second retracted portion (51) gradually decreases, or the outer diameter of the second expanded portion (52) gradually increases.

26. The compressor assembly (1000) according to claim 22, wherein, The valve unit is a four-way valve (10), and the valve unit includes a first valve pipe (21), a second valve pipe (22), a third valve pipe (23), and a fourth valve pipe (24), wherein, At least one of the first valve pipe (21), the second valve pipe (22), the third valve pipe (23), and the fourth valve pipe (24) is the first valve pipe (2), or, At least one of the first valve pipe (21), the second valve pipe (22), the third valve pipe (23), and the fourth valve pipe (24) is the second valve pipe (2'), or, A portion of the first valve tube (21), the second valve tube (22), the third valve tube (23), and the fourth valve tube (24) is the first valve tube (2), and the remainder is the second valve tube (2').

27. The compressor assembly (1000) according to claim 26, wherein, The exhaust pipe assembly includes a second exhaust pipe (301), the intake pipe assembly includes a first intake pipe (400), the first valve pipe (21) is connected to the second exhaust pipe (301), the second valve pipe (22) is connected to the first intake pipe (400), the third valve pipe (23) is connected to the first outlet pipe (700), and the fourth valve pipe (24) is connected to the second outlet pipe (600). At least one of the first valve tube (21), the second valve tube (22), the third valve tube (23), and the fourth valve tube (24) is a stainless steel tube made of the flexible stainless steel.

28. The compressor assembly (1000) according to claim 27, wherein, The second exhaust pipe (301) and the first valve pipe (21) are both integrally formed stainless steel pipes made of flexible stainless steel. The second exhaust pipe (301) and the first valve pipe (21) are welded together by a first solder (91), and / or, The first suction pipe (400) and the second valve pipe (22) are both integrally formed flexible stainless steel pipes, and are welded together by a first solder (91); and / or, Both the first outlet pipe (700) and the third valve pipe (23) are integrally formed flexible stainless steel pipes, and the first intake pipe (400) and the third valve pipe (23) are welded together by a first solder (91); and / or, The second outlet pipe (600) and the fourth valve pipe (24) are both integrally formed stainless steel pipes made of flexible stainless steel. The second outlet pipe (600) and the fourth valve pipe (24) are welded together by the first solder (91).

29. The compressor assembly (1000) according to claim 27, wherein, One of the second exhaust pipe (301) and the first valve pipe (21) is a flexible stainless steel pipe integrally formed, and the other is a copper pipe or a copper alloy pipe. The exhaust pipe (300) and the first valve pipe (21) are welded together by a second solder (92), and / or, One of the first intake pipe (400) and the second valve pipe (22) is a flexible stainless steel pipe integrally formed, and the other is a copper pipe or a copper alloy pipe. The first intake pipe (400) and the second valve pipe (22) are welded together by a second solder (92); and / or, One of the first outlet pipe (700) and the third valve pipe (23) is a flexible stainless steel pipe integrally formed, and the other is a copper pipe or a copper alloy pipe. The first outlet pipe (700) and the third valve pipe (23) are welded together by a second solder (92); and / or, One of the second outlet pipe (600) and the fourth valve pipe (24) is a flexible stainless steel pipe integrally formed, and the other is a copper pipe or a copper alloy pipe. The second outlet pipe (600) and the fourth valve pipe (24) are welded together by a second solder (92).

30. The compressor assembly (1000) according to claim 1, wherein, The suction pipe assembly includes a first suction pipe (400) and a second suction pipe (401). The second suction pipe (401) is connected between the gas-liquid separator (200) and the four-way valve assembly (100). The first suction pipe (400) and / or the second suction pipe (401) have multiple bends (3011). The second suction pipe (401) is a flexible stainless steel pipe integrally formed, and the material composition of the flexible stainless steel includes at least copper.

31. The compressor assembly (1000) according to claim 30, wherein, The first intake tube (400) and / or the second intake tube (401) include a plurality of intake straight tubes (103), and the bend (3011) is connected between two adjacent intake straight tubes (103).

32. The compressor assembly (1000) according to claim 30, wherein, The bend (3011) is an arc.

33. The compressor assembly (1000) according to claim 30, wherein, The first intake pipe (400) includes a first intake pipe (1011) and a second intake pipe (2011) connected together. The first intake pipe (1011) includes a first intake straight pipe (1012), a second intake straight pipe (1013) and an intake bend pipe (1014). The intake bend pipe (1014) is connected between the first intake straight pipe (1012) and the second intake straight pipe (1013). One end of the second intake straight pipe (1013) away from the intake bend pipe (1014) is connected to the second intake pipe (2011).

34. The compressor assembly (1000) according to claim 33, wherein, The bend (3011) is provided between the second intake pipe (2011) and the first intake pipe (1011).

35. The compressor assembly (1000) according to claim 33, wherein, The outer diameters of the first intake straight pipe (1012) and the second intake straight pipe (1013) are both d, and the bending radius of the intake bent pipe (1014) is r, satisfying 1.2d≤r≤1.5d.

36. The compressor assembly (1000) according to claim 30, wherein, The second inhalation tube (401) includes multiple tube segments, and the bend (3011) is connected between two adjacent tube segments. The multiple tube segments are a first inhalation tube segment (2012), a second inhalation tube segment (2013), a third inhalation tube segment (2014), a fourth inhalation tube segment (2015), and a fifth inhalation tube segment (2016) connected in sequence. The first inhalation tube segment (2012), the third inhalation tube segment (2014), and the fifth inhalation tube segment (2016) all extend along a first direction, and the second inhalation tube segment (2013) and the fifth inhalation tube segment (2016) extend along a second direction. The first direction and the second direction are perpendicular to each other.

37. The compressor assembly (1000) according to claim 33, wherein, An expansion tube is provided at one end of the first intake tube (400) and / or the second intake tube (401), the diameter of which is larger than the diameter of the intake straight tube (103). A retraction tube is provided at the other end of the first intake tube (400) and / or the second intake tube (401), the diameter of which is smaller than the diameter of the intake straight tube (103); or, an expansion tube is provided at both ends of the first intake tube (400) and / or the second intake tube (401), the diameter of which is larger than the diameter of the intake straight tube (103); or, a retraction tube is provided at both ends of the first intake tube (400) and / or the second intake tube (401), the diameter of which is smaller than the diameter of the intake straight tube (103).

38. The compressor assembly (1000) according to claim 37, wherein, The expansion tube includes at least one sub-expansion tube. When there are multiple sub-expansion tubes, the multiple sub-expansion tubes are connected in sequence, and the diameter of the multiple sub-expansion tubes increases in sequence in the direction from the bend (3011) to the intake straight tube (103); and / or, the retraction tube includes at least one sub-retraction tube. When there are multiple sub-retraction tubes, the multiple sub-retraction tubes are connected in sequence, and the diameter of the multiple sub-retraction tubes decreases in sequence in the direction from the bend (3011) to the intake straight tube (103).

39. The compressor assembly (1000) according to claim 38, wherein, One end of the first intake pipe (400) and / or the second intake pipe (401) has a limiting part that cooperates with the external piping; or, both ends of the first intake pipe (400) and / or the second intake pipe (401) have limiting parts that cooperate with the external piping.

40. The compressor assembly (1000) according to claim 39, wherein, The limiting part is a convex hull or an annular protrusion extending around the axis of the intake straight pipe (103).

41. The compressor assembly (1000) according to claim 39, wherein, The first suction pipe (400), the second suction pipe (401) and the external piping are all integrally formed stainless steel pipes made of flexible stainless steel. The first suction pipe (400) or the second suction pipe (401) and the external piping are welded together by a first solder (91).

42. The compressor assembly (1000) according to claim 30, wherein, One or both ends of the first suction pipe (400) or the second suction pipe (401) are connected to external pipes. The first suction pipe (400) and the second suction pipe (401) are stainless steel pipes integrally formed from flexible stainless steel. The external pipes are copper pipes or copper alloy pipes. The first suction pipe (400) or the second suction pipe (401) and the external pipes are welded together by a second solder (92).

43. The compressor assembly (1000) according to claim 30, wherein, One or both ends of the first suction pipe (400) or the second suction pipe (401) are connected to external piping. One or both ends of the first suction pipe (400) and the second suction pipe (401) are provided with a first sleeve (87). One or both ends of the first suction pipe (400) or the second suction pipe (401) are provided with a second sleeve (88). The first sleeve (87) and the second sleeve (88) are welded together by a third solder (93) or a fourth solder (94).

44. The compressor assembly (1000) according to any one of claims 1-43, wherein, The yield strength of the flexible stainless steel is 140-180 MPa; and / or, the tensile strength of the flexible stainless steel is reduced to 400-600 MPa; and / or, the elongation of the flexible stainless steel is 50-80%; and / or, the yield strength ratio of the flexible stainless steel is less than 0.4; and / or, the hardness of the flexible stainless steel material is 90-120 Hv.

45. The compressor assembly (1000) according to any one of claims 1-43, wherein, The flexible stainless steel is composed of the following components by weight percentage: C: less than 0.02%, Si: 0.5% to 1%, Mn: 1 to 2%, Cr: 16 to 18%, Ni: 9 to 11%, Cu: 2 to 4%, Mo: 0 to 0.02%, P: less than 0.03%; S: less than 0.03%, the remainder consists of Fe and unavoidable impurities.

46. ​​The compressor assembly (1000) according to any one of claims 1-43, wherein, The Md30 of the flexible stainless steel is -50℃ to -80℃.

47. The compressor assembly (1000) according to any one of claims 1-43, wherein, The flexible stainless steel is austenitic stainless steel, and the average grain size of the flexible stainless steel is 20μm to 40μm.

48. The compressor assembly (1000) according to any one of claims 1-43, wherein, The wall thickness of stainless steel pipes is 1.2mm to 1.5mm.

49. The compressor assembly (1000) according to any one of claims 1-43, wherein, The compressor assembly (1000) includes a first welded tube (81) and a second welded tube (82) welded together, both the first welded tube (81) and the second welded tube (82) being made of the flexible stainless steel, and the first welded tube (81) and the second welded tube (82) being welded together by a first solder (91), wherein, The first solder (91) contains Cu: 46%–50%, Ni: 9%–11%, Si: 0.04%–0.25% by Wt%, with the remainder consisting of Zn and unavoidable impurities; The flux used when the first solder (91) is used contains 60%-80% boric acid, 5%-15% fluoride and 10%-20% potassium borate, in Wt% quantity. The melting temperature t1 when using the first solder (91) satisfies: 910℃≤t1≤935℃; When using the first solder (91), the brazing temperature t2 satisfies: 950℃≤t2≤975℃.

50. The compressor assembly (1000) according to any one of claims 1-43, wherein, The compressor assembly (1000) includes a third welded tube (83) and a fourth welded tube (84) welded together. The third welded tube (83) is a stainless steel tube integrally formed from flexible stainless steel, and the fourth welded tube (84) is a copper tube or a copper alloy tube. The third welded tube (83) and the fourth welded tube (84) are welded together by a second solder (92). The second solder (92) contains Cu: 57%-61%, Sn: 1.0%-1.5%, Si: 0.05%-0.2% by Wt%, with the remainder consisting of Zn and unavoidable impurities; The flux used when using the second solder (92) consists of 60%-80% boric acid, 5%-15% fluoride, and 10%-20% potassium borate, calculated in Wt%. The melting temperature t1 when using the second solder (92) satisfies: 880℃≤t1≤890℃; When using the second solder (92), the brazing temperature t2 satisfies: 920℃≤t2≤930℃.

51. The compressor assembly (1000) according to any one of claims 1-43, wherein, The compressor assembly (1000) includes a fifth welded tube (85) and a sixth welded tube (86) welded together. The fifth welded tube (85) has a first sleeve (87) welded to its end, and the sixth welded tube (86) has a second sleeve (88) welded to its end. The first sleeve (87) and the second sleeve (88) are welded together using a third solder (93) or a fourth solder (94). The first sleeve (87) is a copper sleeve or a copper alloy sleeve; The second sleeve (88) is a copper sleeve or a copper alloy sleeve; The third solder (93) is a tin bronze solder; The fourth solder (94) is a silver-copper solder.

52. A heat source unit, wherein, Includes the compressor assembly (1000) according to any one of claims 1-51.

53. The heat source unit according to claim 52, wherein, It also includes a third piping, wherein the compressor assembly (1000) has a seventh welded pipe welded to the third piping, wherein, Both the seventh welded pipe and the third piping are stainless steel pipes made of the flexible stainless steel, and the seventh welded pipe and the third piping are welded together by a first solder (91). The first solder (91) contains Cu: 46%–50%, Ni: 9%–11%, Si: 0.04%–0.25% by Wt%, with the remainder consisting of Zn and unavoidable impurities; The flux used when the first solder (91) is used contains 60%-80% boric acid, 5%-15% fluoride and 10%-20% potassium borate, in Wt% quantity. The melting temperature t1 when using the first solder (91) satisfies: 910℃≤t1≤935℃; When using the first solder (91), the brazing temperature t2 satisfies: 950℃≤t2≤975℃.

54. The heat source unit according to claim 52, wherein, It also includes a fourth piping, wherein the compressor assembly (1000) has an eighth welded pipe welded to the fourth piping, the end of the eighth welded pipe being welded to a third sleeve, the end of the fourth piping being welded to a fourth sleeve, and the third sleeve and the fourth sleeve being welded together by a third solder (93) or a fourth solder (94), wherein, The third sleeve is a copper sleeve or a copper alloy sleeve; The fourth sleeve is a copper sleeve or a copper alloy sleeve; The third solder (93) is tin bronze solder; the fourth solder (94) is silver copper solder.

55. The heat source unit according to claim 52, wherein, It also includes a fifth piping, the compressor assembly (1000) having a ninth welded pipe welded to the fifth piping, one of the fifth piping and the ninth welded pipe being an integrally formed stainless steel pipe of the flexible stainless steel, and the other being a copper pipe or a copper alloy pipe, the fifth piping and the ninth welded pipe being welded together by a second solder (92), wherein, The second solder (92) contains Cu: 57%-61%, Sn: 1.0%-1.5%, Si: 0.05%-0.2% by Wt%, with the remainder consisting of Zn and unavoidable impurities; The flux used when using the second solder (92) consists of 60%-80% boric acid, 5%-15% fluoride, and 10%-20% potassium borate, calculated in Wt%. The melting temperature t1 when using the second solder (92) satisfies: 880℃≤t1≤890℃; When using the second solder (92), the brazing temperature t2 satisfies: 920℃≤t2≤930℃.

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