JP2024513318A - Fitting assemblies, four-way valve assemblies and air conditioning systems - Google Patents

Abstract

The Company provides fitting assemblies, four-way valve assemblies and air conditioning systems. Here, the fitting assembly includes a first pipe fitting (10), a second pipe fitting (20), a first connecting sleeve (30) connected to one end of the first pipe fitting (10), and a second pipe fitting (10). a second connecting sleeve (40) connected to one end of the fitting (20) and connected to the first connecting sleeve (30), where the first connecting sleeve (30) is a first straight pipe; , the second connecting sleeve (40) is a second straight pipe nested with the first straight pipe, or the first connecting sleeve (30) is a first variable diameter pipe and the second connecting sleeve (40) is a second variable diameter pipe nested with the first variable diameter pipe. This technical aspect effectively solves the problem that welding between the stainless steel tube group and the copper tube group is restricted due to the limited volume of the welding furnace.
[Selection diagram] Figure 1

Description

This application claims priority to a Chinese patent application whose filing date is April 13, 2021, whose application number is 202120752797.6, and whose invention is titled "Joint assembly, four-way valve assembly and air conditioning system". do.

TECHNICAL FIELD This application relates to the technical field of heat exchange systems, and specifically to coupling assemblies, four-way valve assemblies, and air conditioning systems.

In air conditioning systems, a group of stainless steel tubes and a group of copper tubes are usually connected, but in order to make welding easier for air conditioning manufacturers, generally a single copper joint is provided in a group of stainless steel tubes and welded with a group of copper tubes. Make it easier.

Normally, copper joints and stainless steel tubes are welded in a welding furnace, but since the volume of the welding furnace is limited, if the space occupied by the stainless steel tubes is relatively large, welding of the copper joints and stainless steel tubes will be difficult. You will be restricted.

Application summary

The main purpose of this application is to provide a joint assembly, a four-way valve assembly, and an air conditioning system to solve the related art problem of the limited volume of a welding furnace and the limited length of stainless steel pipes. shall be.

To achieve the above object, according to one aspect of the present application, a first pipe fitting, a second pipe fitting, a first connecting sleeve connected to one end of the first pipe fitting, and a second pipe fitting are provided. a second connecting sleeve connected to one end and connected to the first connecting sleeve, wherein the first connecting sleeve is the first straight pipe and the second connecting sleeve is nested with the first straight pipe. Alternatively, the first connecting sleeve is a first variable diameter pipe, and the second connecting sleeve is a second variable diameter pipe nested with the first variable diameter pipe. A fitting assembly is provided.

Further, when the first connecting sleeve is a first straight pipe and the second connecting sleeve is a second straight pipe, the first pipe fitting is a third variable diameter pipe, and the second pipe fitting is a fourth variable diameter pipe. The first pipe fitting and the first connection sleeve are provided in a nested manner, and the second connection sleeve and the second pipe fitting are provided in a nested manner.

Further, the first pipe fitting includes a first linear segment, a first enlarged diameter segment, and a second linear segment connected in order, and the second pipe fitting includes a third linear segment, a second enlarged diameter segment connected in order. and a fourth linear segment, the first connecting sleeve is fitted onto the exterior of the second connecting sleeve, the second connecting sleeve is fitted onto the outside of the first connecting sleeve, and the third linear segment is fitted onto the exterior of the second connecting sleeve. Fitted externally, the end of the second connecting sleeve abuts the second enlarged diameter segment.

Further, the included angle between the outer wall of the first enlarged diameter segment and the outer wall of the first linear segment is greater than or equal to 120 degrees.

Additionally, the length of the first connecting sleeve is greater than the length of the second connecting sleeve, and the length of the second connecting sleeve is greater than the length of the fourth straight segment.

Further, one end of the first connecting sleeve located inside the second pipe fitting protrudes from the first pipe fitting, and one end of the second connecting sleeve located inside the second pipe fitting protrudes from the first pipe fitting. .

Furthermore, the first pipe fitting includes a fifth linear segment, a first diameter reducing segment, and a sixth linear segment connected in order, and the second pipe fitting includes a seventh linear segment, a third diameter increasing segment connected in order. and an eighth straight segment, the first connecting sleeve being fitted onto the outside of the fifth straight segment, the end of the first connecting sleeve abutting the first reduced diameter segment, and the second connecting sleeve being connected to the first connecting sleeve. The eighth straight segment is fitted on the outside of the sleeve, and the eighth linear segment is fitted on the outside of the second connecting sleeve, and the end of the second connecting sleeve abuts the third enlarged diameter segment.

Furthermore, the included angle between the outer wall of the first reduced diameter segment and the outer wall of the fifth linear segment is 120 degrees or more.

Further, when the first connecting sleeve is a first variable diameter pipe and the second connecting sleeve is a second variable diameter pipe, the first pipe fitting is a third straight pipe, and the second pipe fitting is a fourth straight pipe. and the first end of the first connecting sleeve and the one end of the first pipe fitting are nested, and the second end of the first connecting sleeve and the first end of the second connecting sleeve are nested. The second end of the second connecting sleeve and the one end of the second pipe fitting are nested.

Further, the first connecting sleeve includes a ninth linear segment, a second reducing diameter segment, a tenth linear segment, a fourth expanding diameter segment, and an eleventh linear segment connected in order, and the second connecting sleeve includes a ninth linear segment connected in order. a twelfth linear segment, a fifth enlarged diameter segment and a thirteenth linear segment, the ninth linear segment being fitted onto the exterior of one end of the first pipe fitting, and the end of the first pipe fitting being connected to the second reduced diameter segment. , one end of the twelfth straight segment is nested within the eleventh straight segment, an end of the twelfth straight segment is abutted against the fourth enlarged diameter segment, and one end of the second pipe fitting is nested within the eleventh straight segment; Nested within the thirteenth straight segment, the end of the second pipe fitting abuts the fifth enlarged diameter segment.

Further, the material of the first pipe joint and the second pipe joint is stainless steel, and the material of the first connection sleeve and the second connection sleeve is copper.

According to another aspect of the present application, a four-way valve assembly is provided that includes a four-way valve and a fitting assembly, the fitting assembly being a fitting assembly as described above.

According to another aspect of the present application, an air conditioning system is provided that includes a four-way valve assembly, the four-way valve assembly being a four-way valve assembly as described above.

Applying the technical aspects of the present application, the fitting assembly includes a first pipe fitting, a second pipe fitting, a first connecting sleeve and a second connecting sleeve. A first connecting sleeve is connected to one end of the first pipe fitting. A second connecting sleeve is connected to one end of the second pipe fitting. The first connection sleeve and the second connection sleeve are connected. Here, the first connecting sleeve is a first straight pipe, and the second connecting sleeve is a second straight pipe nested with the first straight pipe. Alternatively, the first connecting sleeve is a first variable diameter pipe, and the second connecting sleeve is a second variable diameter pipe nested with the first variable diameter pipe. In this way, both the first connecting sleeve and the second connecting sleeve are relatively short, and the first pipe fitting and the first connecting sleeve are first connected inside the welding furnace, and the second pipe fitting and the second connecting sleeve are connected to each other inside the welding furnace. It can be connected to a connecting sleeve. Thereafter, the first pipe joint and the second pipe joint are further connected by the first connecting sleeve and the second connecting sleeve outside the welding furnace. In this way, the technical aspect of the present application eliminates the need to consider that the welding furnace is too small, and that the connection length between the first pipe fitting and the second pipe fitting that are connected to each other is limited. To avoid. Therefore, the technical aspects of the present application effectively solve the problem in the related art that the volume of the welding furnace is limited and the length of the stainless steel tube is limited. Moreover, the second straight pipe and the first straight pipe are provided in a nested manner so that the connection strength between the first connecting sleeve and the second connecting sleeve can be increased, or the first variable diameter pipe is connected to the first straight pipe. The structural strength of the pipe joint itself can be increased, and the second variable diameter pipe can increase the structural strength of the second pipe joint itself. In this way, the strength of the connection between the first pipe joint and the second pipe joint can be increased, and the quality of the connection between the first pipe joint and the second pipe joint can be ensured.

The drawings in the specification forming part of the present application are for the purpose of providing a further understanding of the present application, and the schematic embodiments of the present application and their descriptions are for the purpose of interpreting the present application. and are not intended to unduly limit this application.

1 shows a front schematic view of Example 1 of a coupling assembly according to the present application; FIG. 2 shows a schematic cross-sectional view of the coupling assembly of FIG. 1; FIG. FIG. 3 shows an enlarged schematic view of location A of the joint assembly in FIG. 2. FIG. FIG. 3 shows a schematic front view of Example 2 of the joint assembly according to the present application. 5 shows a schematic cross-sectional view of the fitting assembly of FIG. 4; FIG. FIG. 6 shows an enlarged schematic view of location B of the joint assembly in FIG. 5; FIG. 3 shows a front schematic view of Example 3 of a coupling assembly according to the present application. Figure 8 shows a cross-sectional schematic view of the fitting assembly of Figure 7; FIG. 9 is an enlarged schematic diagram of location C of the joint assembly in FIG. 8;

Here, the following symbols are included in the above-mentioned drawings.
10 first pipe fitting, 11 first linear segment, 12 first expanding diameter segment, 13 second linear segment, 14 fifth linear segment, 15 first reducing diameter segment, 16 sixth straight segment, 20 second pipe fitting, 21 third straight segment, 22 second expanded diameter segment, 23 fourth straight segment, 24 seventh straight segment, 25 third expanded diameter segment, 26 eighth straight segment, 30 first connection sleeve, 31 ninth straight segment, 32 second reduced diameter segment, 33 tenth linear segment, 34 fourth enlarged diameter segment, 35 eleventh linear segment, 40 second connection sleeve, 41 twelfth linear segment, 42 fifth enlarged diameter segment, 43 thirteenth linear segment .

Hereinafter, technical aspects in the embodiments of the present application will be clearly and completely described with reference to drawings in the embodiments of the present application, but the described embodiments are merely some embodiments of the present application, Obviously, not all implementations are possible. The following description of at least one exemplary embodiment is only illustrative in nature and is in no way limiting to the present application and its application or use.

As shown in FIGS. 1 to 3, the fitting assembly of Example 1 includes a first pipe fitting 10, a second pipe fitting 20, a first connecting sleeve 30, and a second connecting sleeve 40. The first connecting sleeve 30 is connected to one end of the first pipe fitting 10. The second connecting sleeve 40 is connected to one end of the second pipe fitting 20. The first connection sleeve 30 and the second connection sleeve 40 are connected. Here, the first connecting sleeve 30 is a first straight pipe, and the second connecting sleeve 40 is a second straight pipe nested with the first straight pipe.

Applying the technical aspect of the first embodiment, both the first connecting sleeve 30 and the second connecting sleeve 40 are relatively short, and the first pipe fitting 10 and the first connecting sleeve 30 are first connected inside the welding furnace. The second pipe joint 20 and the second connection sleeve 40 can be connected by this. Thereafter, the first pipe fitting 10 and the second pipe fitting 20 are further connected by the first connecting sleeve 30 and the second connecting sleeve 40 outside the welding furnace. In this way, the technical aspect of the present application does not require consideration that the welding furnace is too small, and the connection length between the first pipe fitting 10 and the second pipe fitting 20 that are connected to each other is limited. avoid that. Therefore, the technical aspect of Example 1 effectively solves the problem in the related technology that the volume of the welding furnace is limited and the length of the stainless steel tube is limited. Furthermore, the second straight pipe and the first straight pipe are nested, so that the strength of the connection between the first connection sleeve 30 and the second connection sleeve 40 can be increased. In this way, the strength of the connection between the first pipe joint 10 and the second pipe joint 20 can be increased, and the quality of the connection between the first pipe joint 10 and the second pipe joint 20 can be ensured. Since the welding furnace is too small, the first pipe fitting 10 or the second pipe fitting 20 may be cut into multiple segments.

In the first embodiment, the first connecting sleeve 30 and one end of the first pipe fitting 10 are formed by furnace welding, using a copper-based welding material, and having a melting point of 1000 degrees or more. The second connecting sleeve 40 adopts furnace welding, adopts a copper-based welding material, has a melting point of 1000 degrees or more, and is connected to one end of the second pipe joint 20. The first connection sleeve 30 and the second connection sleeve 40 are welded using flame, using phosphor copper welding material, and the welding temperature is 900 degrees or less. In this way, it is possible to ensure that the respective welding positions are not affected by the melting points of different welding materials at different connection positions.

As shown in FIGS. 2 and 3, when the first connecting sleeve 30 is a first straight pipe and the second connecting sleeve 40 is a second straight pipe, the first pipe fitting 10 is a third variable diameter pipe. The second pipe joint 20 is a fourth variable diameter pipe. The first pipe fitting 10 and the first connection sleeve 30 are provided in a nested manner, and the second connection sleeve 40 and the second pipe fitting 20 are provided in a nested manner. In this way, the first pipe fitting 10, the first connection sleeve 30, the second connection sleeve 40, and the second pipe fitting 20 are stacked in this order, and contact is established between the first pipe fitting 10 and the second pipe fitting 20. This greatly increases the connection strength between the first pipe joint 10 and the second pipe joint 20.

As shown in FIGS. 2 and 3, the first pipe fitting 10 includes a first straight segment 11, a first enlarged diameter segment 12, and a second straight segment 13 connected in sequence. The second pipe fitting 20 includes a third straight segment 21, a second enlarged diameter segment 22, and a fourth straight segment 23 connected in sequence. The first connecting sleeve 30 is fitted on the outside of the second straight segment 13, the second connecting sleeve 40 is fitted on the outside of the first connecting sleeve 30, and the third straight segment 21 is fitted on the outside of the second connecting sleeve 40. When fitted, the end of the second connecting sleeve 40 abuts the second enlarged diameter segment 22 . In this way, the stability of the connection points between the first connection sleeve 30 and the second straight line segment 13 can be increased, and the second straight line segment 13, the first connection sleeve 30, the second connection sleeve 40 and the fourth It is also possible to increase the stability of the connection points between the straight segments 23.

As shown in FIG. 3, the included angle between the outer wall of the first enlarged diameter segment 12 and the outer wall of the first straight segment 11 is 120 degrees or more. In this way, stress concentration is less likely to occur at the transition location between the outer wall of the first enlarged diameter segment 12 and the outer wall of the first linear segment 11, and processing becomes easier. Preferably, the included angle between the outer wall of the first enlarged diameter segment 12 and the outer wall of the first straight segment 11 is 120 degrees or 150 degrees.

As shown in FIG. 3, in order to ensure the stability of the connection between the first pipe fitting 10 and the second pipe fitting 20, the length of the first connecting sleeve 30 is longer than the length of the second connecting sleeve 40. , and the length of the second connecting sleeve 40 is longer than the length of the fourth straight segment 23.

As shown in FIG. 3, one end of the first connecting sleeve 30 located inside the second pipe fitting 20 protrudes from the first pipe fitting 10, and one end of the second connecting sleeve 40 is located inside the second pipe fitting 20. One end of the pipe protrudes from the first pipe fitting 10 . In this way, the circulating substance (for example, gas or liquid) inside the second straight segment 13 flows to the inside of the third straight segment 21, reducing the influence of the second enlarged diameter segment 22 on the second flow capacity. be able to.

In Example 1, the material of the first pipe joint 10 and the second pipe joint 20 is stainless steel, and the material of the first connection sleeve 30 and the second connection sleeve 40 is copper.

Embodiment 2 of the fitting assembly of the present application differs from Embodiment 1 in the structural shape of the first pipe fitting. As shown in FIGS. 4 to 6, in the second embodiment, the first pipe fitting 10 includes a fifth linear segment 14, a first diameter-reducing segment 15, and a sixth linear segment 16 connected in sequence. The second pipe fitting 20 includes a seventh linear segment 24, a third enlarged diameter segment 25, and an eighth linear segment 26 connected in sequence. The first connecting sleeve 30 is fitted on the outside of the fifth linear segment 14 , the end of the first connecting sleeve 30 abuts the first reduced diameter segment 15 , and the second connecting sleeve 40 is fitted on the outside of the fifth straight segment 14 . Fitted externally, the eighth linear segment 26 is fitted externally to the second connecting sleeve 40 , and the end of the second connecting sleeve 40 abuts the third enlarged diameter segment 25 . In this way, the stability of the connection point between the first connection sleeve 30 and the fifth linear segment 14 can be increased, and the stability of the connection point between the first connection sleeve 30 and the fifth linear segment 14 can be increased, and It is also possible to increase the stability of the connection points between straight segments 26.

As shown in FIGS. 5 and 6, the included angle between the outer wall of the first reduced diameter segment 15 and the outer wall of the fifth linear segment 14 is 120 degrees or more. In this way, stress concentration is less likely to occur at the transition location between the first diameter-reduced segment 15 and the outer wall of the fifth linear segment 14, and processing becomes easier. The included angle between the outer wall of the first reduced diameter segment 15 and the outer wall of the fifth straight segment 14 is 120 degrees or 150 degrees.

Embodiment 3 of the fitting assembly of the present application differs from Embodiment 1 in the structural shapes of the first pipe fitting, the first connecting sleeve, the second connecting sleeve, and the second pipe fitting. As shown in FIGS. 7 to 9, in the third embodiment, when the first connection sleeve 30 is a first variable diameter pipe and the second connection sleeve 40 is a second variable diameter pipe, the first pipe joint 10 is a third straight pipe, the second pipe joint 20 is a fourth straight pipe, the first end of the first connection sleeve 30 and one end of the first pipe joint 10 are nested, and the first connection The second end of the sleeve 30 and the first end of the second connection sleeve 40 are nested, and the second end of the second connection sleeve 40 and one end of the second pipe fitting 20 are nested. . The first variable diameter pipe can increase the structural strength of the first pipe joint 10 itself, and the second variable diameter pipe can increase the structural strength of the second pipe joint 20 itself. In this way, the strength of the connection between the first pipe joint 10 and the second pipe joint 20 can be increased, and the quality of the connection between the first pipe joint 10 and the second pipe joint 20 can be ensured. At the same time, when flame welding the first pipe fitting and the first connection sleeve, it is possible to avoid burning up to the first pipe fitting during flame welding, so that the first pipe fitting has good corrosion resistance, and the first pipe fitting has good corrosion resistance. Extend the service life of the connection sleeve.

As shown in FIG. 9, the first connection sleeve 30 includes a ninth linear segment 31, a second reduced diameter segment 32, a tenth linear segment 33, a fourth enlarged diameter segment 34, and an eleventh linear segment 35 connected in order. including. The second connecting sleeve 40 includes a twelfth linear segment 41, a fifth enlarged diameter segment 42, and a thirteenth linear segment 43 connected in sequence. The ninth straight segment 31 is fitted onto the outside of one end of the first pipe fitting 10 . In this way, the stability of the connection between the ninth straight segment 31 and one end of the first pipe joint 10 can be ensured. The end of the first pipe fitting 10 abuts the second reduced diameter segment 32 , and one end of the twelfth straight segment 41 is nested inside the eleventh straight segment 35 . In this way, the stability of the connection between one end of the twelfth straight segment 41 and the eleventh straight segment 35 can be ensured. The end of the twelfth straight segment 41 abuts the fourth enlarged diameter segment 34 , one end of the second pipe fitting 20 is nested inside the thirteenth straight segment 43 , and the end of the second pipe fitting 20 is nested inside the thirteenth straight segment 43 . is abutted against the fifth enlarged diameter segment 42. In this way, the stability of the connection between the end of the second pipe joint 20 and the thirteenth straight segment 43 can be ensured.

The present application further provides a four-way valve assembly, and the four-way valve assembly of this embodiment includes a four-way valve and a coupling assembly, where the coupling assembly is the coupling assembly described above. Because the above-mentioned fitting assembly can solve the problem of the limited volume of the welding furnace and the limited length of the stainless steel tube in the related art, the four-way valve assembly including this fitting assembly can be used in the same technology. Able to solve problems.

The present application further provides an air conditioning system, and the air conditioning system of this embodiment includes a four-way valve assembly, and the four-way valve assembly is the four-way valve assembly described above. The above-mentioned four-way valve assembly can solve the problem of the limited volume of the welding furnace and the limited length of the stainless steel tube in the related technology, so the air conditioning system including this four-way valve assembly can be used in the same technology. Able to solve problems.

What has been described above are only preferred embodiments of the present application and are not intended to limit the present application, and the present application is capable of various modifications and variations to those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this application.

Claims (13)

a first pipe joint (10);
a second pipe joint (20);
a first connection sleeve (30) connected to one end of the first pipe fitting (10);
a second connection sleeve (40) connected to one end of the second pipe fitting (20) and connected to the first connection sleeve (30);
including;
Here, the first connecting sleeve (30) is a first straight pipe, and the second connecting sleeve (40) is a second straight pipe nested with the first straight pipe, or The first connecting sleeve (30) is a first variable diameter pipe, and the second connecting sleeve (40) is a second variable diameter pipe nested with the first variable diameter pipe. . When the first connecting sleeve (30) is the first straight pipe and the second connecting sleeve (40) is the second straight pipe, the first pipe fitting (10) is a third variable diameter pipe. The second pipe joint (20) is a fourth variable diameter pipe, the first pipe joint (10) and the first connection sleeve (30) are nested, and the second pipe joint (20) is a fourth variable diameter pipe. The fitting assembly of claim 1, wherein (40) and the second pipe fitting (20) are nested. The first pipe fitting (10) includes a first linear segment (11), a first enlarged diameter segment (12) and a second linear segment (13) connected in sequence, and the second pipe fitting (20) includes , a third linear segment (21), a second enlarged diameter segment (22) and a fourth linear segment (23) connected in sequence, the first connecting sleeve (30) being connected to the second linear segment (13). The second connecting sleeve (40) is fitted externally to the first connecting sleeve (30), and the third straight segment (21) is externally fitted to the second connecting sleeve (40). 3. A fitting assembly according to claim 2, wherein the end of the second connecting sleeve (40) abuts the second enlarged diameter segment (22). A fitting assembly according to claim 3, wherein the included angle between the outer wall of the first enlarged diameter segment (12) and the outer wall of the first straight segment (11) is greater than or equal to 120 degrees. The length of the first connecting sleeve (30) is longer than the length of the second connecting sleeve (40), and the length of the second connecting sleeve (40) is longer than the length of the fourth straight segment (23). 4. The fitting assembly of claim 3. One end of the first connecting sleeve (30) located inside the second pipe fitting (20) protrudes from the first pipe fitting (10), and one end of the first connecting sleeve (30) is located inside the second pipe fitting (20), and one end of the first connecting sleeve (30) is protruded from the first pipe fitting (10). A fitting assembly according to claim 2, wherein one end located inside the pipe fitting (20) projects from the first pipe fitting (10). The first pipe fitting (10) includes a fifth linear segment (14), a first reduced diameter segment (15) and a sixth linear segment (16) connected in sequence, and the second pipe fitting (20) includes , a seventh linear segment (24), a third enlarged diameter segment (25) and an eighth linear segment (26) connected in sequence, the first connecting sleeve (30) being connected to the fifth linear segment (14). Fitted externally, the end of the first connecting sleeve (30) abuts the first reduced diameter segment (15), and the second connecting sleeve (40) is connected to the first connecting sleeve (30). The eighth linear segment (26) is fitted externally to the second connecting sleeve (40), and the end of the second connecting sleeve (40) is connected to the third enlarged diameter segment (25). 3. The fitting assembly according to claim 2, wherein the fitting assembly is abutted against the fitting assembly. The fitting assembly of claim 7, wherein the included angle between the outer wall of the first reduced diameter segment (15) and the outer wall of the fifth straight segment (14) is greater than or equal to 120 degrees. When the first connecting sleeve (30) is the first variable diameter pipe and the second connecting sleeve (40) is the second variable diameter pipe, the first pipe fitting (10) is the third straight pipe. and the second pipe joint (20) is a fourth straight pipe, and the first end of the first connection sleeve (30) and one end of the first pipe joint (10) are nested. , the second end of the first connection sleeve (30) and the first end of the second connection sleeve (40) are nested, and the second end of the second connection sleeve (40) and the first end of the second connection sleeve (40) are nested. 2. A fitting assembly according to claim 1, wherein the fitting assembly is nested with one end of the two-pipe fitting (20). The first connection sleeve (30) has a ninth linear segment (31), a second reduced diameter segment (32), a tenth linear segment (33), a fourth enlarged diameter segment (34), and an eleventh linear segment connected in order. The second connection sleeve (40) includes a twelfth straight segment (41), a fifth enlarged diameter segment (42) and a thirteenth straight segment (43) connected in sequence, A ninth straight segment (31) is fitted onto the outside of one end of the first pipe fitting (10), and the end of the first pipe fitting (10) abuts the second reduced diameter segment (32). , one end of the twelfth linear segment (41) is nested within the eleventh linear segment (35), and an end of the twelfth linear segment (41) is nested within the fourth enlarged diameter segment (34). , one end of the second pipe fitting (20) is nested inside the thirteenth linear segment (43), and an end of the second pipe fitting (20) is abutted against the fifth enlarged diameter. Joint assembly according to claim 9, abutted on the segment (42). The first pipe fitting (10) and the second pipe fitting (20) are made of stainless steel, and the first connection sleeve (30) and the second connection sleeve (40) are made of copper. 1. The fitting assembly according to 1. A four-way valve assembly comprising a four-way valve and a fitting assembly, the fitting assembly being a fitting assembly according to any one of claims 1 to 11. An air conditioning system comprising a four-way valve assembly, wherein the four-way valve assembly is the four-way valve assembly of claim 12.

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