Piping structure, refrigerant switching device, and heating, ventilation, and air conditioning system

Abstract

The present application discloses a piping structure, a refrigerant switching device, and a heating, ventilation, and air conditioning system. The piping structure comprises multiple metal refrigerant pipes and a metal connector pipe. Each metal refrigerant pipe comprises a connecting pipe segment; the metal connector pipe comprises a main pipe body; the main pipe body is provided with multiple connection branches; and each connection branch is connected to a corresponding connecting pipe segment, so that a heat exchange medium inside an internal flow channel of the main pipe body can flow, at each connection branch, into and out of an internal flow channel of a corresponding metal refrigerant pipe. The hardness of the connecting pipe segments is H1, and the hardness of the connection branches is H2, wherein H2≥H1. By providing connection branches to support connecting pipe segments, the connections between the connecting pipe segments and the connection branches are not prone to deformation due to various stresses even when a metal connector pipe is relatively long, such that multiple metal refrigerant pipes are integrally assembled with the metal connector pipe in advance to achieve batch assembly, and then are connected to other pipes, thereby effectively improving the assembly efficiency and assembly stability.

Description

Pipeline structure, refrigerant switching device and heating and ventilation system

[0001] Related applications

[0002] This application claims priority to the following Chinese patent applications:

[0003] Application No. 202410865453.4, filed on June 28, 2024, and entitled "Pipeline structure, refrigerant switching device and heating and ventilation system";

[0004] Application No. 202421521356.5, filed on June 28, 2024, and entitled "Pipeline structure, refrigerant switching device and heating and ventilation system";

[0005] The above patents are hereby incorporated by reference in their entirety. TECHNICAL FIELD

[0006] The present application relates to the technical field of air conditioners, and in particular to a pipeline structure, a refrigerant switching device and a heating and ventilation system. BACKGROUND

[0007] The refrigerant switching device is part of a heating and ventilation system, and is used to deliver low-temperature heat exchange medium to an indoor unit for refrigeration or to deliver high-temperature heat exchange medium to the indoor unit for heating.

[0008] The refrigerant switching device includes a pipeline structure for delivering heat exchange medium, and multiple delivery pipelines of the pipeline structure are respectively in communication with corresponding gas pipes and liquid pipes to form refrigerant passages that communicate the indoor unit and the outdoor unit. Among them, the number of delivery pipelines that communicate with each gas pipe and liquid pipe is large, which is difficult to assemble in position, and after assembly, various stresses can cause the pipeline structure to be unstable, affecting the use of the refrigerant switching device. SUMMARY

[0009] The present application provides a pipeline structure, a refrigerant switching device and a heating and ventilation system, which can solve the problem of unstable assembly of the pipeline structure of the refrigerant switching device.

[0010] In a first aspect, the present application provides a pipeline structure for a refrigerant switching device, the pipeline structure comprising:

[0011] a plurality of metal refrigerant pipes, each of the metal refrigerant pipes comprising a butt joint pipe section; and

[0012] a metal interface pipe comprising a main pipe body having a plurality of adapter branches, each of the adapter branches being connected to one of the butt joint pipe sections, so that heat exchange medium in an internal flow passage of the main pipe body can enter and exit an internal flow passage of each of the metal refrigerant pipes at each of the adapter branches;

[0013] The connecting pipe has a hardness H1, and the adapter branch has a hardness H2, H2≥H1.

[0014] In some exemplary embodiments, the main pipe body comprises a main pipe section, and the adapter branch is an adapter flange protruding from the outer circumferential wall surface of the main pipe section, and the adapter flange has an adapter channel communicating with the internal flow channel of the main pipe body.

[0015] The connecting pipe section is sleeved with the adapter flange to make the internal flow channel of the main pipe body communicate with the internal flow channel of the metal refrigerant pipe.

[0016] In some exemplary embodiments, the connecting pipe section is inserted into the adapter branch, or the connecting pipe section is sleeved with the outer circumferential wall surface of the adapter flange.

[0017] In some exemplary embodiments, the end of the connecting pipe section is in contact with the outer circumferential wall surface of the main pipe section.

[0018] In some exemplary embodiments, the adapter flange is integrally arranged with the main pipe section, the material of the adapter flange is stainless steel, the material of the main pipe section is stainless steel, and the material of the connecting pipe section is at least one of stainless steel, copper alloy, copper, aluminum alloy, and aluminum.

[0019] In some exemplary embodiments, the metal interface pipe comprises an adapter end pipe arranged at the end of the main pipe body, and further comprises a filter mounted on the adapter end pipe, and the filter comprises a filter screen for filtering the heat exchange medium entering or exiting the main pipe body.

[0020] In some exemplary embodiments, the filter is arranged inside the adapter end pipe, or the filter is arranged between the adapter end pipe and the main pipe body.

[0021] In some exemplary embodiments, the filter is arranged between the adapter end pipe and the main pipe body.

[0022] The metal interface pipe further comprises a first transition portion arranged at the axial end of the main pipe body, the material of the main pipe body is stainless steel, and the material of the first transition portion is different from stainless steel.

[0023] The filter has a first joint, the first joint is radially overlapped with the first transition portion, the radially overlapped part of the first joint and the radially overlapped part of the first transition portion have the same material or the same main component.

[0024] In some example embodiments, the material of the radially overlapping portion of the first joint is one of copper or a copper alloy, the material of the radially overlapping portion of the first transition is one of copper or a copper alloy; or the material of the radially overlapping portion of the first joint is one of aluminum or an aluminum alloy, the material of the radially overlapping portion of the first transition is one of aluminum or an aluminum alloy.

[0025] In some example embodiments, the filter includes a second joint radially overlappingly connected with the adapter pipe, the material of the radially overlapping portion of the second joint is the same as or substantially the same as the material of the radially overlapping portion of the adapter pipe.

[0026] In some example embodiments, the material of the radially overlapping portion of the second joint is one of copper or a copper alloy, the material of the radially overlapping portion of the adapter pipe is one of copper or a copper alloy; or the material of the radially overlapping portion of the second joint is one of aluminum or an aluminum alloy, the material of the radially overlapping portion of the adapter pipe is one of aluminum or an aluminum alloy.

[0027] In some example embodiments, the adapter pipe includes a main pipe portion and a second transition connected with the main pipe portion, the material of the main pipe portion is stainless steel, the material of the second transition is different from stainless steel, and the second transition is radially overlappingly connected with the second joint.

[0028] In some example embodiments, the material of the radially overlapping portion of the second joint is one of copper or a copper alloy, the material of the adapter pipe is one of copper or a copper alloy, and the axial end portion of the adapter pipe is radially overlappingly connected with the second joint by solder; or the material of the radially overlapping portion of the second joint is one of aluminum or an aluminum alloy, the material of the adapter pipe is one of aluminum or an aluminum alloy, and the axial end portion of the adapter pipe is radially overlappingly connected with the second joint by solder.

[0029] In some example embodiments, the filter includes a can body, the material of the can body is stainless steel, the first joint and the second joint are respectively welded to the axial two ends of the can body, and the main component material of the first joint and the second joint is copper.

[0030] In some example embodiments, the material of the main pipe body is stainless steel, the material of the butt pipe segment is at least one of copper, a copper alloy, aluminum, and an aluminum alloy, and the metal interface pipe further includes:

[0031] The first transition part is arranged at an axial end of the main pipe body, and is made of any one of copper, copper alloy, aluminum and aluminum alloy.

[0032] The adapter end pipe is connected with the first transition part.

[0033] In some exemplary embodiments, the axial end of the adapter end pipe is connected with the first transition part in a radial overlap manner, and the material of the radially overlapped part of the axial end of the adapter end pipe is the same as that of the radially overlapped part of the first transition part.

[0034] In some exemplary embodiments, the adapter end pipe is entirely made of any one of copper, copper alloy, aluminum and aluminum alloy.

[0035] In some exemplary embodiments, the adapter end pipe comprises a main pipe part and a second transition part, the main pipe part is made of stainless steel, the second transition part is made of the same material or the same main component material as the first transition part, and the first transition part and the second transition part are radially overlapped.

[0036] In some exemplary embodiments, the metal interface pipe comprises an adapter end pipe arranged at an end of the main pipe body, and further comprises a filter installed on the adapter end pipe, the filter comprises a filter screen, which is protruded from the adapter end pipe towards the main pipe body, so as to filter the heat exchange medium entering or leaving the main pipe body.

[0037] In some exemplary embodiments, the filter is arranged inside the adapter end pipe; or, the filter is arranged between the adapter end pipe and the main pipe body.

[0038] In some exemplary embodiments, the pipeline structure comprises a plurality of metal interface pipes.

[0039] The main pipe bodies of the plurality of metal interface pipes are parallel, and are arranged side by side and spaced apart in a direction perpendicular to the length direction of the main pipe bodies.

[0040] The adapter pipe section comprises a first section connected with the main pipe body, the first section is a straight pipe, and the first sections of the plurality of metal refrigerant pipes connected with the same metal interface pipe are arranged in parallel.

[0041] In some exemplary embodiments, the pipeline structure comprises a first gas interface pipe, and the metal refrigerant pipes comprise first refrigerant pipes connected with the first gas interface pipe, each of the first refrigerant pipes is used to communicate with an indoor unit, so as to deliver high-temperature gaseous heat exchange medium to the indoor unit.

[0042] The pipeline structure comprises a first liquid interface pipe, the metal refrigerant pipe comprises a second refrigerant pipe connected with the first liquid interface pipe, and each second refrigerant pipe is used for communicating with an indoor unit to receive the medium of medium-temperature liquid heat exchange returned by the indoor unit.

[0043] The pipeline structure comprises a second liquid interface pipe, the metal refrigerant pipe comprises a third heat exchange pipe connected with the second liquid interface pipe, and each third heat exchange pipe is used for communicating with an indoor unit to deliver the medium of low-temperature liquid heat exchange to the indoor unit.

[0044] The pipeline structure comprises a second gas interface pipe, the metal refrigerant pipe comprises a fourth heat exchange pipe connected with the second gas interface pipe, and each fourth heat exchange pipe is used for communicating with an indoor unit to receive the medium of high-temperature gaseous heat exchange returned by the indoor unit.

[0045] At least one of the first gas interface pipe, the second gas interface pipe, the first liquid interface pipe and the second liquid interface pipe is formed by the metal interface pipe.

[0046] In some exemplary embodiments, the metal refrigerant pipe used for communicating with the same indoor unit comprises the first refrigerant pipe and the second refrigerant pipe.

[0047] The first refrigerant pipe is multiplexed as the fourth heat exchange pipe, and the metal refrigerant pipe further comprises a first auxiliary pipe, one end of the first auxiliary pipe communicates with the first refrigerant pipe, and the other end of the first auxiliary pipe communicates with the second gas interface pipe.

[0048] The second refrigerant pipe is multiplexed as the third heat exchange pipe, and the metal refrigerant pipe further comprises a second auxiliary pipe, one end of the second auxiliary pipe communicates with the second liquid interface pipe, and the other end of the second auxiliary pipe communicates with the second refrigerant pipe.

[0049] In a second aspect, the application provides a refrigerant switching device, comprising a refrigerant switching shell and a pipeline structure as described above, and the pipeline structure is arranged in the internal space of the refrigerant switching shell.

[0050] In a third aspect, the application provides a heating and ventilation system, comprising an outdoor unit, an indoor unit and a refrigerant switching device as described above, the pipeline structure of the refrigerant switching device communicates the outdoor unit and the indoor unit, and forms a heating cycle and a refrigeration cycle.

[0051] In some exemplary embodiments, the heating cycle comprises an outdoor unit-first gas interface pipe-first refrigerant pipe-indoor unit-second refrigerant pipe-first liquid interface pipe-outdoor unit connected in sequence.

[0052] The refrigeration cycle comprises the outdoor unit-second liquid interface pipe-third heat exchange pipe-indoor unit-fourth heat exchange pipe-second gas interface pipe-outdoor unit connected in sequence;

[0053] At least one of the first gas interface pipe, the second gas interface pipe, the first liquid interface pipe and the second liquid interface pipe is formed by the metal interface pipe, and the first refrigerant pipe, the second refrigerant pipe, the third heat exchange pipe and the fourth heat exchange pipe are formed by the metal refrigerant pipe.

[0054] Based on the pipeline structure, the refrigerant switching device and the heating and ventilation system, the adapter branch provides support for the butt joint pipe section, so that the connection between the butt joint pipe section and the adapter branch is not easy to deform. Even in the case that the length of the metal interface pipe is relatively long, the connection between the butt joint pipe section and the adapter branch is not easy to be affected by various stresses, and the good connection stability can still be maintained. In this way, the structural stability of the pipeline structure applied to the refrigerant switching device can be improved, so as to maintain the stable operation of the refrigerant switching device in the frequent heat exchange environment, and the multiple metal refrigerant pipes and the metal interface pipe can be assembled into one body in advance during the assembly of the pipeline structure. After batch assembly, the other pipelines are connected, and the assembly efficiency is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0055] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed in the embodiment or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0056] Fig. 1 is a perspective structural schematic view of the pipeline structure of an embodiment of the present application;

[0057] Fig. 2 is a front structural schematic view of the metal refrigerant pipe installed in the metal interface pipe of an embodiment of the present application;

[0058] Fig. 3 is a front structural schematic view of the adapter pipe section connected to the butt joint pipe section of an embodiment of the present application;

[0059] Fig. 4 is a front structural schematic view of the filter installed between the main pipe body and the adapter end pipe of an embodiment of the present application;

[0060] Fig. 5 is a front structural schematic view of the filter installed in the adapter end pipe of an embodiment of the present application;

[0061] Fig. 6 is a sectional view of the filter installed between the main pipe body and the adapter end pipe of an embodiment of the present application;

[0062] Figure 7 is a cross-sectional view of a filter connected to a main pipe body according to an embodiment of the present application;

[0063] Figure 8 is a cross-sectional view of a first joint connected to a first transition pipe and a second joint connected to a second transition pipe according to an embodiment of the present application;

[0064] Figure 9 is a cross-sectional view of a second joint connected to an adapter end pipe according to an embodiment of the present application;

[0065] Figure 10 is a cross-sectional view of an adapter end pipe connected to a first transition pipe according to an embodiment of the present application;

[0066] Figure 11 is a cross-sectional view of a second transition pipe connected to a first transition pipe according to an embodiment of the present application;

[0067] Figure 12 is a schematic view of a heat exchange medium flowing through a pipe structure in a full heating mode according to an embodiment of the present application;

[0068] Figure 13 is a schematic view of a heat exchange medium flowing through a pipe structure in a full cooling mode according to an embodiment of the present application;

[0069] Figure 14 is a schematic view of a heat exchange medium flowing through a pipe structure in a main heating mode according to an embodiment of the present application;

[0070] Figure 15 is a schematic view of a heat exchange medium flowing through a pipe structure in a main cooling mode according to an embodiment of the present application.

[0071] Reference signs: 10, pipe structure; 20, outdoor unit; 30, indoor unit; 100, metal interface pipe; 110, main pipe body; 111, main pipe section; 112, adapter branch; 1121, adapter flange; 120, adapter end pipe; 121, main pipe section; 122, second transition pipe; 130, filter; 131, first joint; 132, second joint; 133, tank body; 140, first transition section; 200, metal refrigerant pipe; 210, mating pipe section; 211, first section; 212, second section; 213, transition section; 220, adapter pipe section; 101, first gas interface pipe; 102, second gas interface pipe; 103, first liquid interface pipe; 104, second liquid interface pipe; 201, first refrigerant pipe; 202, second refrigerant pipe; 203, first auxiliary pipe; 204, second auxiliary pipe; 205, first liquid pipe; 206, second liquid pipe; 300, heat exchanger; 310, first flow path; 320, second flow path; 400, electronic expansion valve; 500, pressure relief pipe. DETAILED DESCRIPTION

[0072] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0073] The inventor found that the refrigerant switching device can communicate with multiple indoor units for regulating the multiple indoor units to switch between the cooling mode and the heating mode, and therefore, the number of branch pipes of the pipe structure of the refrigerant switching device is very large. The pipe structure of the refrigerant switching device includes gas pipes and liquid pipes, which respectively communicate with multiple branch pipes to split and collect the heat exchange medium, so that the heat exchange medium can flow smoothly in each branch pipe in the relevant mode. However, due to the large number of branch pipes, the multiple branch pipes have a complex layout, and multiple valve bodies are required to control the on-off of the related pipes, which makes the assembly of the pipe structure of the refrigerant switching device very inconvenient, and the stability of the pipe structure of the refrigerant switching device is affected by the pipe deformation, the pulling between pipes, the thermal expansion and contraction, the weight of the pipe itself and other forces. Based on this, the embodiments of the present application provide a pipe structure, a refrigerant switching device and a heating and ventilation system.

[0074] As shown in FIG. 1, it is a perspective structure schematic diagram of the pipe structure 10 of an embodiment of the present application, which is used for a refrigerant switching device to communicate the indoor unit and the outdoor unit of a heating and ventilation system, and then to regulate the heating and ventilation system to switch between the cooling mode and the heating mode.

[0075] The pipe structure 10 of the embodiments of the present application can be used to communicate one outdoor unit with at least one indoor unit. When the pipe structure 10 communicates one outdoor unit with multiple indoor units, by controlling the on-off of each pipe, it can realize that part of the indoor units are in the heating mode, another part of the indoor units are in the heating mode, or all the indoor units are in the heating mode, or all the indoor units are in the cooling mode.

[0076] As shown in FIG. 1, the pipe structure 10 includes a metal refrigerant pipe 200 for communicating with the indoor unit, and the number of the metal refrigerant pipes 200 communicating with the same indoor unit is multiple. The pipe structure 10 further includes a metal interface pipe 100 communicating with the metal refrigerant pipe 200, and the heat exchange medium in the pipe structure 10 can flow in the internal flow passages of both the metal refrigerant pipe 200 and the metal interface pipe 100. Each metal interface pipe 100 communicates with multiple metal refrigerant pipes 200 to split and collect the heat exchange medium, thereby realizing the communication of one outdoor unit with at least one indoor unit.

[0077] In the embodiment of the present application, the number of metal refrigerant pipes 200 connected with the same metal interface pipe 100 is large, and a certain width needs to be reserved between the adjacent two metal refrigerant pipes 200, and meanwhile, the relative positions between the various structural members of the pipeline structure 10 also need to be considered, which requires very high machining precision and alignment precision of the metal refrigerant pipes 200 and the metal interface pipe 100. The more the number of metal refrigerant pipes 200 is, the higher the probability of pipeline misalignment is. Misalignment of any position of the metal refrigerant pipes 200 and the metal interface pipe 100 will affect the connection stability of the pipeline structure 10, and in the frequent heat exchange environment, the pipeline structure 10 is more likely to be aged, and even the pipeline may be damaged. In addition, the large number of metal refrigerant pipes 200 connected with the same metal interface pipe 100 makes the length of the metal interface pipe 100 need to be set longer, and under the action of gravity of the metal interface pipe 100 and the heat exchange medium, the metal interface pipe 100 is prone to deformation, which is not convenient for assembly, and also makes the metal interface pipe 100 prone to poor connection at the butt joint position with the metal refrigerant pipe 200.

[0078] As shown in FIG. 1, each metal refrigerant pipe 200 includes a butt joint pipe segment 210, and the metal interface pipe 100 includes a main pipe body 110 having a plurality of adapter branches 112, each adapter branch 112 is connected with one butt joint pipe segment 210, so that the heat exchange medium in the internal flow passage of the main pipe body 110 can enter and exit the internal flow passage of the corresponding metal refrigerant pipe 200 at each adapter branch 112. The butt joint pipe has a hardness H1, the adapter branch 112 has a hardness H2, and H2≥H1. In the embodiment of the present application, the hardness of each metal pipe is counted by Brinell hardness.

[0079] In the embodiment of the present application, the adapter branch 112 provides support for the butt joint pipe segment 210, so that the connection between the butt joint pipe segment 210 and the adapter branch 112 is not prone to deformation. Even if the length of the metal interface pipe 100 is relatively long, the connection between the butt joint pipe segment 210 and the adapter branch 112 is also not prone to be affected by various stresses, and can still maintain good connection stability. In this way, not only can the structural stability of the pipeline structure 10 applied to the refrigerant switching device be improved to maintain stable operation of the refrigerant switching device in the frequent heat exchange environment, but also the plurality of metal refrigerant pipes 200 and the metal interface pipe 100 can be assembled into one body in advance during the assembly of the pipeline structure 10, and after batch assembly, the metal refrigerant pipes 200 and the metal interface pipe 100 are connected with other pipelines, which effectively improves the assembly efficiency.

[0080] In the embodiment of the present application, the adapter branch 112 provides support for the butt joint pipe segment 210, so that the connection between the butt joint pipe segment 210 and the adapter branch 112 is not prone to deformation. Even if the length of the metal interface pipe 100 is relatively long, the connection between the butt joint pipe segment 210 and the adapter branch 112 is also not prone to be affected by various stresses, and can still maintain good connection stability. In this way, not only can the structural stability of the pipeline structure 10 applied to the refrigerant switching device be improved to maintain stable operation of the refrigerant switching device in the frequent heat exchange environment, but also the plurality of metal refrigerant pipes 200 and the metal interface pipe 100 can be assembled into one body in advance during the assembly of the pipeline structure 10, and after batch assembly, the metal refrigerant pipes 200 and the metal interface pipe 100 are connected with other pipelines, which effectively improves the assembly efficiency.

[0081] In the embodiments of the present application, the metal refrigerant pipe 200 and the metal interface pipe 100 are both made of metal material, the connection part of the metal refrigerant pipe 200 and the metal interface pipe 100 can be fixed by welding, and the gap at the joint of the metal refrigerant pipe 200 and the metal interface pipe 100 is sealed. The connection part of the metal refrigerant pipe 200 and other pipelines, and the connection part of the metal interface pipe 100 and other pipelines can all be fixed by welding.

[0082] It should be noted that in the embodiments of the present application, as long as the structure of connecting multiple pipes with one pipe is involved, the structure of connecting multiple metal refrigerant pipes 200 with the metal interface pipe 100 can be adopted.

[0083] As shown in FIG. 2, the main pipe body 110 of the metal interface pipe 100 includes a main pipe segment 111, and the metal refrigerant pipe 200 is fixed to the main pipe segment 111 to fix the relative positions of the metal interface pipe 100 and the metal refrigerant pipe 200. Optionally, the main pipe segment 111 is a stainless steel flute pipe, which has good structural strength, can bear multiple metal refrigerant pipes 200 connected thereto and is not easy to deform, thereby improving the connection stability. In addition, the stainless steel material has good corrosion resistance, which can effectively resist the corrosion of the heat exchange medium in the environment of frequent heat exchange. In other embodiments, the main pipe segment 111 can also be made of other materials, as long as the material of the main pipe segment 111 can bear the weight and is not easy to deform, and has good corrosion resistance, which is suitable for the present application.

[0084] Optionally, the adapter branch 112 is an adapter opening opened in the outer peripheral wall surface of the main pipe segment 111, the adapter opening is in communication with the internal flow channel of the main pipe segment 111, the adapter pipe segment 210 of the metal refrigerant pipe 200 is inserted into the adapter opening and is fixedly connected with the main pipe segment 111, wherein the wall surface of the main pipe segment 111 defining the adapter opening can be used to provide support for the adapter pipe segment 210, thereby improving the connection stability at this position. At this time, the hardness of the main pipe segment 111 is H2, and the hardness of the main pipe segment 111 is greater than the hardness of the adapter pipe segment 210, so as to provide support for the adapter pipe segment 210.

[0085] Optionally, as shown in FIG. 2, the adapter branch 112 is an adapter flange 1121 protruding from the outer circumferential wall of the main pipe segment 111. The adapter flange 1121 has an adapter channel that communicates with the internal flow channel of the main pipe body 110. The adapter pipe segment 210 is sleeved with the adapter flange 1121 so that the internal flow channel of the main pipe body 110 communicates with the internal flow channel of the metal refrigerant pipe 200. For example, the adapter pipe segment 210 is inserted into the adapter channel, and then the adapter pipe segment 210 and the adapter flange 1121 are sealingly connected. Alternatively, the adapter pipe segment 210 can be sleeved outside the adapter flange 1121, and then the adapter pipe segment 210 and the adapter flange 1121 are sealingly connected. In this way, the area of interaction between the adapter branch 112 and the adapter pipe segment 210 is increased, and the connection between the adapter branch 112 and the adapter pipe segment 210 is less likely to be loose or deformed, thereby further improving the connection stability of the connection between the adapter branch 112 and the adapter pipe segment 210.

[0086] In the embodiments of the present application, the adapter flange 1121 is integrally arranged with the main pipe segment 111, so that the connection between the adapter flange 1121 and the main pipe segment 111 has good structural strength and is less likely to be deformed. For example, the adapter flange 1121 is integrally punched and formed from the circumferential wall of the main pipe segment 111, or the adapter flange 1121 is integrally welded with the main pipe segment 111. When the number of adapter flanges 1121 connected to the same main pipe segment 111 is multiple, all the adapter flanges 1121 are integrally arranged with the main pipe segment 111.

[0087] In addition, the adapter flange 1121 also needs to have good structural strength and be less likely to be deformed. Optionally, the material of the adapter flange 1121 is stainless steel. In other embodiments, the adapter flange 1121 can also be made of other materials as long as the hardness of the adapter flange 1121 is greater than that of the adapter pipe segment 210. Further, the adapter flange 1121 and the main pipe segment 111 can be made of the same material to strengthen the connection structural strength of the adapter flange 1121 and the main pipe segment 111. For example, the adapter flange 1121 is a stainless steel flange, and the material of the main pipe segment 111 is stainless steel.

[0088] Optionally, the material of the butt joint pipe section 210 is at least one of stainless steel, copper alloy, copper, aluminum alloy, and aluminum, so as to facilitate welding of the butt joint pipe section 210 and the main pipe body 110 into one body. When the adapter branch 112 is made of stainless steel, the butt joint pipe section 210 is a stainless steel butt joint pipe, and the two are made of the same stainless steel material, so that the hardness H2 of the adapter branch 112 is equal to the hardness H1 of the butt joint pipe section 210. When the butt joint pipe section 210 is a copper butt joint pipe, the hardness H2 of the adapter branch 112 is greater than the hardness H1 of the butt joint pipe section 210. Both copper and stainless steel have good corrosion resistance, and when the heat exchange medium enters the gap between the butt joint pipe section 210 and the main pipe body 110, the pipe wall will not be easily eroded.

[0089] As shown in FIG. 3, the metal refrigerant pipe 200 further includes an adapter pipe section 220 connected to the butt joint pipe section 210, and the internal flow channels of the two are in communication. The adapter pipe section 220 is used to butt joint with the relevant pipe interfaces, valve body interfaces, and other pipe interfaces of the pipe structure 10, or can also be used to butt joint with other pipe interfaces outside the refrigerant switching device, so as to conduct the relevant flow channels of the heating and ventilation system and form a smooth heat exchange medium transmission channel. The adapter pipe section 220 can be bent at least once based on the position of the pipe interface connected thereto to meet the positioning requirements. The shape and connection position of the adapter pipe section 220 are not limited in the embodiments of the present application, and can be selected according to actual needs.

[0090] Both the butt joint pipe section 210 and the adapter pipe section 220 are made of metal materials, so as to be integrally welded, and facilitate the integration of the pipe structure 10 and the connection with other structures. The materials of the butt joint pipe section 210 and the adapter pipe section 220 can be the same or different. For example, both the butt joint pipe section 210 and the adapter pipe section 220 are made of copper, or both are made of stainless steel, or the butt joint pipe section 210 is made of stainless steel and the adapter pipe section 220 is made of copper.

[0091] Of course, in some other embodiments, the metal refrigerant pipe 200 can not include the adapter pipe section 220, and the metal refrigerant pipe 200 only includes the butt joint pipe section 210. The butt joint pipe section 210 is connected with the corresponding pipe interface, and is bent in a multi-section structure based on the position of the relevant pipe interface, so as to butt joint with the pipe.

[0092] In addition to the metal refrigerant pipe 200, the metal interface pipe 100 of the embodiments of the present application can also be used to butt joint with other pipe interfaces outside the refrigerant switching device. The metal interface pipe 100 can include an adapter end pipe 120 arranged at the end of the main pipe body 110, and the adapter end pipe 120 is connected to the other pipe interface to be butt jointed, so as to connect the internal flow channel of the main pipe body 110 with the other pipe interface.

[0093] In addition, considering that the heat exchange medium entering or leaving the internal flow passage of the main body 110 also needs to be filtered, the metal interface pipe 100 further comprises a filter 130, which comprises a filter screen for filtering the heat exchange medium entering or leaving the main body 110. The filter 130 can be arranged such that one end of the filter 130 is connected to the end of the adapter end pipe 120, and the other end of the filter 130 is connected to another pipe interface outside the refrigerant switching device to be connected. Alternatively, as shown in FIG. 4, the filter 130 can be arranged to be connected between the adapter end pipe 120 and the main body 110. Alternatively, as shown in FIG. 3 or FIG. 5, the filter screen of the filter 130 is arranged inside the adapter end pipe 120.

[0094] The assembly mode in which the filter 130 is arranged inside the adapter end pipe 120 includes, but is not limited to, that the filter 130 is crimped inside the adapter end pipe 120, or that the edge structure of the filter 130 is embedded at the connection between the adapter end pipe 120 and the main body 110, and the filter screen covers the internal flow passage of the adapter end pipe 120 in the flow direction of the heat exchange medium inside the adapter end pipe 120. In addition, based on the filtering requirement, the size of the filter screen of the selected filter 130 is greater than or equal to the flow passage of the internal flow passage of the main body 110, at which time the inner diameter of the relevant position of the adapter end pipe 120 where the filter screen is installed can be designed to meet the installation requirement of the filter screen. The material of the adapter end pipe 120 is also selected to be the same as the material of the pipe interface to be connected, which can be selected according to actual requirements.

[0095] The heat exchange medium can enter or leave the main body 110 from both ends of the main pipe section 111 of the main body 110. The metal interface pipe 100 comprises at least one filter 130, and preferably comprises two filters 130. Correspondingly, the metal interface pipe 100 further comprises two adapter end pipes 120 installed one by one corresponding to the two filters 130. The two filters 130 are arranged at opposite ends of the main pipe section 111, and the adapter branch 112 is located between the two filters 130, so as to more fully filter the heat exchange medium entering or leaving the main body 110, and also to filter the heat exchange medium entering or leaving the metal refrigerant pipe 200, without the need to further arrange a filter on the metal refrigerant pipe 200, thereby reducing the flow resistance inside the pipe structure 10.

[0096] As shown in FIG. 6, the filter 130 is arranged between the adapter end pipe 120 and the main body 110, wherein the composition of the filter 130, the adapter end pipe 120 and the main body 110 has multiple embodiments.

[0097] First embodiment

[0098] Optionally, as shown in FIG. 7, the material of the main pipe body 110 is stainless steel, the material of the main body part of the filter 130 and the adapter end pipe 120 is stainless steel, and the two ends of the filter 130 are welded to the main pipe body 110 and the adapter end pipe 120 respectively. At this time, the welding between the main pipe body 110, the filter 130 and the adapter end pipe 120 is stainless steel-stainless steel welding, which is formed by furnace welding, and is free from manual work such as torch brazing.

[0099] Second embodiment

[0100] Optionally, as shown in FIG. 8, the filter 130 is arranged between the adapter end pipe 120 and the main pipe body 110, the material of the main pipe body 110 is stainless steel, and the material of the main body part of the filter 130 and the main body part of the adapter end pipe 120 is stainless steel.

[0101] The metal interface pipe 100 further comprises a first transition part 140 arranged at the axial end of the main pipe body 110, wherein the material of the main pipe body 110 is stainless steel, and the material of the first transition part 140 is different from stainless steel, and the main pipe body 110 and the first transition part 141 are formed by furnace welding with solder.

[0102] The filter 130 has a first joint 131 and a second joint 132, and the material of the first joint 131 and the second joint is different from stainless steel, wherein the filter 130 and the first joint 131, and the filter 130 and the second joint are formed by furnace welding with solder.

[0103] The first joint 131 is connected to the first transition portion 140 in radial overlap, and the radially overlapped portion of the first joint 131 and the radially overlapped portion of the first transition portion 140 are made of the same material or the same material of the main component. Alternatively, the radially overlapped portion of the first joint 131 is made of one of copper or a copper alloy, and the radially overlapped portion of the first transition portion 140 is made of one of copper or a copper alloy. Alternatively, the radially overlapped portion of the first joint 131 is made of one of aluminum or an aluminum alloy, and the radially overlapped portion of the first transition portion 140 is made of one of aluminum or an aluminum alloy. The first joint 131 and the first transition portion 140 are brazed by manual work such as torch brazing, and the melting point of the brazing material between the first joint 131 and the first transition portion 140 is lower than the melting point of the brazing material between the first joint 131 and the filter 130, so that the first joint 131 can be separated from the first transition portion 140 by a work method of field melting. Because the melting point of the brazing material between the first joint 131 and the filter 130 is higher, when the first joint 131 is melted and separated from the first transition portion 140, the brazing material between the first joint 131 and the filter 130 has not yet melted, and the two are in a fixed welded state, so that the filter 130 with the first joint 131 can be removed for replacement and maintenance. When the filter 130 needs to be connected to the main pipe body 110, the first joint 131 is re-welded to the first transition portion 140.

[0104] The second joint 132 is connected to the adapter end pipe 120 in radial overlap, and the radially overlapped portion of the second joint 132 and the radially overlapped portion of the adapter end pipe 120 are made of the same material or the same material of the main component. Alternatively, the radially overlapped portion of the second joint 132 is made of one of copper or a copper alloy, and the radially overlapped portion of the adapter end pipe 120 is made of one of copper or a copper alloy. Alternatively, the radially overlapped portion of the second joint 132 is made of one of aluminum or an aluminum alloy, and the radially overlapped portion of the adapter end pipe 120 is made of one of aluminum or an aluminum alloy.

[0105] At this time, as shown in FIG. 8, the adapter end pipe 120 includes a main pipe portion 121 and a second transition portion 122 connected to the main pipe portion 121, the material of the main pipe portion 121 is stainless steel, and the material of the second transition portion 122 is different from stainless steel. The second transition portion 122 is connected to the second joint 132 in radial overlap, so as to be welded to the second joint 132.

[0106] Third embodiment

[0107] Optionally, as shown in FIG. 8, the filter 130 is arranged between the adapter end pipe 120 and the main pipe body 110, the material of the main pipe body 110 is stainless steel, the main body part of the filter 130 is stainless steel, and the material of the main body part of the adapter end pipe 120 is copper or aluminum.

[0108] Fourth embodiment

[0109] The filter 130 is arranged between the adapter end pipe 120 and the main pipe body 110, the material of the main pipe body 110 is stainless steel, the material of the main body part of the filter 130 is any one of copper, copper alloy, aluminum, and aluminum alloy, and the material of the main body part of the adapter end pipe 120 is any one of copper, copper alloy, aluminum, and aluminum alloy.

[0110] Fifth embodiment

[0111] The filter 130 is arranged between the adapter end pipe 120 and the main pipe body 110, the material of the main pipe body 110 is stainless steel, the material of the main body part of the filter 130 is any one of copper, copper alloy, aluminum, and aluminum alloy, and the material of the main body part of the adapter end pipe 120 is stainless steel.

[0112] Alternatively, as shown in FIG. 9, the material of the radially overlapped part of the second joint 132 is one of copper and copper alloy, the material of the adapter end pipe 120 is one of copper and copper alloy, and the axial end part of the adapter end pipe 120 is connected to the second joint 132 by radially overlapping and welding. Optionally, the material of the radially overlapped part of the second joint 132 is one of aluminum and aluminum alloy, the material of the adapter end pipe 120 is one of aluminum and aluminum alloy, and the axial end part of the adapter end pipe 120 is connected to the second joint 132 by radially overlapping and welding.

[0113] The filter 130 includes a tank body 133, and an interface part (not shown) formed by contracting from both ends of the tank body 133, and the first joint 131 and the second joint 132 are arranged on the inner circumferential wall surface (or the outer circumferential wall surface) of the interface part in the fluid flow direction inside the filter 130, and the flow area of the flow passage inside the tank body 133 is greater than the flow area of the flow passage inside the first joint 131 and the flow area of the flow passage inside the second joint 132. Optionally, the material of the tank body 133 is stainless steel, the first joint 131 and the second joint 132 are welded to the axial two ends of the tank body 133, the first joint 131 and the second joint 132 are pipe materials or plating layers, the main component material of the pipe materials or plating layers is copper, or the main component material of the pipe materials or plating layers is aluminum.

[0114] In some other embodiments, the filter can also not be arranged between the main pipe body 110 and the adapter pipe 120. Optionally, the material of the main pipe body 110 is stainless steel, and the material of the adapter pipe 120 is at least one of copper, copper alloy, aluminum, and aluminum alloy. The metal pipe joint 100 further comprises a first transition portion 140 arranged at the axial end of the main pipe body 110. The material of the first transition portion 140 is any one of copper, copper alloy, aluminum, and aluminum alloy. As shown in FIG. 10, the adapter pipe 120 is connected to the first transition portion 140, that is, the adapter pipe 120 can be directly connected to the main pipe body 110 through the first transition portion 140. At this time, the filter 130 can be arranged inside the adapter pipe 120.

[0115] The axial end of the adapter pipe 120 is radially overlapped with the first transition portion 140. The radially overlapped part of the axial end of the adapter pipe 120 and the radially overlapped part of the first transition portion 140 have the same main component. Optionally, as shown in FIG. 10, the adapter pipe 120 is entirely made of any one of copper, copper alloy, aluminum, and aluminum alloy. Optionally, as shown in FIG. 11, the adapter pipe 120 comprises a main pipe portion 121 and a second transition portion 122. The material of the main pipe portion 121 is stainless steel, and the material of the second transition portion 122 is the same as or has the same main component as that of the first transition portion 140. The first transition portion 140 is radially overlapped with the second transition portion 122.

[0116] The main pipe segment 111 of the main pipe body 110 is a straight pipe, and the length direction of the main pipe segment 111 is the length direction of the main pipe body 110. The pipe structure 10 comprises a plurality of metal pipe joints 100. The main pipe bodies 110 of the plurality of metal pipe joints 100 are parallel. In a direction perpendicular to the length direction of the main pipe body 110, the main pipe bodies 110 of the plurality of metal pipe joints 100 are arranged side by side and spaced apart. In this way, in the case where a plurality of metal refrigerant pipes 200 are connected to the same main pipe body 110, the plurality of metal refrigerant pipes 200 can be orderly arranged, and the entire pipe structure 10 can be compact.

[0117] The connecting pipe segment 210 comprises a first segment 211 connected to the main pipe body 110. The first segment 211 is a straight pipe. The first segments 211 of the plurality of metal refrigerant pipes 200 connected to the same metal pipe joint 100 are arranged in parallel. The plurality of metal refrigerant pipes 200 can be orderly arranged, which facilitates assembly and helps to reduce the size of the pipe structure 10. The length direction of the first segment 211 forms an angle with the length direction of the main pipe body 110. Preferably, the length direction of the first segment 211 is perpendicular to the length direction of the main pipe body 110.

[0118] The adapter pipe section 210 further comprises a second section 212 connected to the adapter pipe section 220, the second section 212 also being a straight pipe, and the second section 212 is coaxially arranged with the first section 211, so that the adapter pipe section 210 as a whole is a straight pipe; or the adapter pipe section 210 further comprises a transition section 213 connected between the second section 212 and the first section 211, and the transition section 213 is arranged at an angle with the second section 212 and the first section 211 respectively, so that the adapter pipe section 210 is a curved pipe, so as to be matched with the adapter pipe section 220 to meet the pipe arrangement requirement. The above is only an exemplary introduction to the shape of the adapter pipe section 210, and the shape of the adapter pipe section 210 is not limited in the embodiments of the present application, and can be selected according to actual requirements.

[0119] Please refer to FIG. 1 again, the pipe structure 10 of the embodiments of the present application at least comprises four pipe bodies of the first gas interface pipe 101, the second gas interface pipe 102, the first liquid interface pipe 103 and the second liquid interface pipe 104, and at least realizes the flow collection and flow distribution of the pipe structure 10 through the four pipe bodies, and realizes the cooperation of the indoor unit and the outdoor unit to switch between the cooling mode and the heating mode. At least one of the first gas interface pipe 101, the second gas interface pipe 102, the first liquid interface pipe 103 and the second liquid interface pipe 104 is formed by the metal interface pipe 100. As shown in FIGS. 12-15, when the pipe structure 10 has the first gas interface pipe 101, the second gas interface pipe 102, the first liquid interface pipe 103 and the second liquid interface pipe 104 in the related embodiments, the flow path of the heat exchange medium is shown.

[0120] Specifically, as shown in FIG. 12, the first gas interface pipe 101 is used to communicate with the pipe connection interface A of the outdoor unit to receive the high-temperature gaseous heat exchange medium delivered by the outdoor unit, the metal refrigerant pipe 200 comprises a first refrigerant pipe 201 connected with the first gas interface pipe 101, and the first refrigerant pipe 201 is used to communicate with the indoor unit to deliver the high-temperature gaseous heat exchange medium to the indoor unit. The metal refrigerant pipe 200 comprises a second refrigerant pipe 202 used to communicate with the pipe connection interface A of the indoor unit to receive the medium-temperature liquid heat exchange medium backflowing from the indoor unit, and the second refrigerant pipe 202 communicates with the first liquid interface pipe 103, and the first liquid interface pipe 103 communicates with the pipe connection interface B of the outdoor unit to deliver the medium-temperature liquid heat exchange medium to the outdoor unit. In this way, the outdoor unit-the first gas interface pipe 101-the first refrigerant pipe 201-the indoor unit-the second refrigerant pipe 202-the first liquid interface pipe 103-the outdoor unit are sequentially communicated, and then a heating cycle of the air conditioning system is formed.

[0121] As shown in FIG. 11, the second liquid interface pipe 104 is used to communicate with the pipe connection interface B of the outdoor unit to receive the low-temperature liquid heat exchange medium delivered by the outdoor unit, the metal refrigerant pipe 200 includes a third heat exchange pipe in communication with the second liquid interface pipe 104, which is used to communicate with the indoor unit to deliver the low-temperature liquid heat exchange medium to the indoor unit. The pipe structure 10 includes a second gas interface pipe 102, and the metal refrigerant pipe 200 includes a fourth heat exchange pipe used to communicate with the indoor unit to receive the medium-temperature gaseous heat exchange medium backflowing from the indoor unit, and the fourth heat exchange pipe is also in communication with the second gas interface pipe 102, and the second gas interface pipe 102 is in communication with the pipe connection interface C of the outdoor unit to deliver the medium-temperature gaseous heat exchange medium to the outdoor unit. In this way, the outdoor unit-second liquid interface pipe 104-third heat exchange pipe-indoor unit-fourth heat exchange pipe-second gas interface pipe 102-outdoor unit are sequentially communicated, thereby forming a refrigeration cycle of the heating and ventilation system.

[0122] As shown in FIG. 13, in the embodiment of the present application, in order to simplify the number of pipes, the first refrigerant pipe 201 is reused as the fourth heat exchange pipe, and the metal refrigerant pipe 200 further includes a first auxiliary pipe 203, one end of which is in communication with the first refrigerant pipe 201 and the other end of which is in communication with the second gas interface pipe 102, and the second refrigerant pipe 202 is reused as the third heat exchange pipe, and the metal refrigerant pipe 200 further includes a second auxiliary pipe 204, one end of which is in communication with the second liquid interface pipe 104 and the other end of which is in communication with the second refrigerant pipe 202. When the number of indoor units is multiple, the first refrigerant pipes 201 of the multiple indoor units are connected to the same first gas interface pipe 101, the second refrigerant pipes 202 of the multiple indoor units are connected to the same first liquid interface pipe 103, the multiple first auxiliary pipes 203 connected one by one with the multiple first refrigerant pipes 201 are connected to the same second gas interface pipe 102, and the multiple second auxiliary pipes 204 connected one by one with the multiple second refrigerant pipes 202 are connected to the same second liquid interface pipe 104.

[0123] As shown in FIG. 13, the metal refrigerant pipe 200 further includes a first liquid pipe 205 in communication with the outdoor unit, the first liquid pipe 205 is in communication with the first liquid interface pipe 103 to deliver the heat exchange medium between the first liquid interface pipe 103 and the outdoor unit, and the first liquid pipe 205 is also in communication with the second liquid interface pipe 104 to deliver the heat exchange medium between the second liquid interface pipe 104 and the outdoor unit. In this way, the heat exchange medium is collected and distributed through the first liquid pipe 205, the first gas interface pipe 101, the first liquid interface pipe 103, the second gas interface pipe 102, and the second liquid interface pipe 104, thereby realizing that the heating and ventilation system can have a full heating mode and a full cooling mode.

[0124] Further, the pipeline structure 10 further comprises a heat exchanger 300 and an electronic expansion valve 400, the heat exchanger 300 has a first flow path 310 and a second flow path 320, the electronic expansion valve 400 is arranged in the second flow path 320 to cool the heat exchange medium in the second flow path 320, and the heat exchange medium in the second flow path 320 is used to cool the heat exchange medium in the first flow path 310.

[0125] The first flow path 310 is connected to the first liquid pipe 205 at one end and connected to the pipe section between the first liquid pipe 205 and the pipeline interface B of the outdoor unit, and the other end of the first flow path 310 is connected to the second liquid interface pipe 104, so that the first liquid pipe 205 is connected to the second liquid interface pipe 104 through the first flow path 310. One end of the second flow path 320 is connected to the second liquid interface pipe 104, and the other end is connected to the pipeline interface C of the outdoor unit, so that part of the heat exchange medium in the first flow path 310 enters the indoor unit through the second liquid interface pipe 104, and the other part of the heat exchange medium flows back to the outdoor unit through the second flow path 320. Optionally, the metal refrigerant pipe 200 further comprises a second liquid pipe 206, one end of the second liquid pipe 206 is connected to the second flow path 320 of the heat exchanger 300, and the other end is connected to the end of the second gas interface pipe 102 for communication with the pipeline interface C of the outdoor unit, so as to simplify the number of pipelines of the pipeline structure 10 for communication with the outdoor unit. In this way, by adding the heat exchanger 300, the second liquid pipe 206 and the electronic expansion valve 400, the heat exchange medium is collected and distributed, so that the heating and ventilation system also has a main heating mode and a main cooling mode.

[0126] The following describes the flow path of the heat exchange medium in the heating and ventilation system under four working modes of full heating mode, full cooling mode, main heating mode and main cooling mode, taking a heating and ventilation system comprising four indoor units, one outdoor unit and one refrigerant switching device as an example. Among them, all the first refrigerant pipes 201 corresponding to the four indoor units are connected to the first gas interface pipe 101, all the second refrigerant pipes 202 corresponding to the four indoor units are connected to the first liquid interface pipe 103, all the first auxiliary pipes 203 corresponding to the four indoor units are connected to the second gas interface pipe 102, and all the second auxiliary pipes 204 corresponding to the four indoor units are connected to the second liquid interface pipe 104.

[0127] As shown in Fig. 12, it is a schematic diagram of the flow path of the heat exchange medium in the piping structure 10 in the full heating mode, in which the four indoor units of the heating and ventilation system are all used for heating. Specifically, the high-temperature gaseous heat exchange medium delivered by the piping interface A of the outdoor unit enters the first gas interface pipe 101 and flows back to the outdoor unit according to the arrow direction of line 1 shown in Fig. 12. The flow path of the heat exchange medium corresponding to a single indoor unit is line 1: piping interface A of the outdoor unit - first gas interface pipe 101 - first refrigerant pipe 201 - indoor unit (high-temperature gaseous heat exchange medium releases heat to form medium-temperature liquid heat exchange medium) - second refrigerant pipe 202 - first liquid interface pipe 103 - first liquid pipe 205 - piping interface B of the outdoor unit. Among them, the high-temperature gaseous heat exchange medium entering the first gas interface pipe 101 enters the four indoor units from the four first refrigerant pipes 201 respectively, and the medium-temperature liquid heat exchange medium output by the four indoor units enters the same first liquid interface pipe 103 from the four second refrigerant pipes 202 and flows back to the outdoor unit.

[0128] As shown in Fig. 13, it is a schematic diagram of the flow path of the heat exchange medium in the piping structure 10 in the full cooling mode, in which the four indoor units of the heating and ventilation system are all used for cooling. Specifically, the low-temperature liquid heat exchange medium delivered by the outdoor unit enters the first liquid pipe 205 and flows back to the outdoor unit according to the arrow direction of line 2 shown in Fig. 13. The flow path of the heat exchange medium corresponding to a single indoor unit is line 2: piping interface B of the outdoor unit - first liquid pipe 205 - first flow path 310 of the heat exchanger 300 - second liquid interface pipe 104 - second auxiliary pipe 204 - second refrigerant pipe 202 - indoor unit (low-temperature liquid heat exchange medium absorbs heat to form medium-temperature gaseous heat exchange medium) - first refrigerant pipe 201 - first auxiliary pipe 203 - second gas interface pipe 102 - piping interface C of the outdoor unit.

[0129] As shown in Fig. 14, it is a schematic diagram of the flow path of the heat exchange medium in the pipeline structure 10 in the main heating mode. In this mode, three of the indoor units of the air conditioning system are used for heating, and the other indoor unit is used for cooling. At this time, the heat exchange medium flowing through each heating indoor unit flows according to the flow path before the first liquid pipe 205 in line 1. After entering the first liquid pipe 205, part of the medium is directly returned to the pipeline interface B of the outdoor unit through the first liquid pipe 205, and the other part of the medium enters the first flow path 310 of the heat exchanger 300. Part of the medium flowing out of the first flow path 310 of the heat exchanger 300 enters the second flow path 320 of the heat exchanger 300, and is cooled by the electronic expansion valve 400 to cool the medium in the first flow path 310 of the heat exchanger 300. The other part of the medium flowing out of the first flow path 310 of the heat exchanger 300 enters the second liquid interface pipe 104, and flows through the cooling indoor unit according to the flow path after the second liquid interface pipe 104 in line 2, and then returns to the pipeline interface C of the outdoor unit.

[0130] As shown in Fig. 15, it is a schematic diagram of the flow path of the heat exchange medium in the pipeline structure 10 in the main cooling mode. In this mode, three of the indoor units of the air conditioning system are used for cooling, and the other indoor unit is used for heating. At this time, the heat exchange medium flowing through each cooling indoor unit flows according to the flow path in line 2. The low-temperature liquid heat exchange medium flowing out of the first flow path 310 of the heat exchanger 300 is also divided into two parts, one part enters the second flow path 320 of the heat exchanger 300, and is cooled by the electronic expansion valve 400 to cool the low-temperature liquid heat exchange medium in the first flow path 310 of the heat exchanger 300. In this mode, the heat exchange medium flowing through the heating indoor unit flows according to the flow path before the first liquid pipe 205 in line 1, and after entering the first liquid pipe 205, it is combined with the low-temperature liquid heat exchange medium in the first liquid pipe 205 to enter the first flow path 310 of the heat exchanger 300, and then enters the second liquid interface pipe 104.

[0131] The above only exemplarily introduces the flow path of the refrigerant switching device and the four indoor units connected thereto. The number of indoor units connected to the same refrigerant switching device in the embodiment of the present application can also be two, three, five, or other numbers of indoor units. The number of indoor units connected to the same refrigerant switching device can be selected according to actual needs, which is not limited in the present application.

[0132] The pipeline structure 10 of the embodiment of the present application further comprises a one-way valve and an on-off valve body for controlling the pipeline to be disconnected. The one-way valve is used to control the one-way pipeline to be disconnected, and the on-off valve body is used to control the pipeline to be disconnected in both directions. For example, the first auxiliary pipeline 203 is provided with a first one-way valve for controlling the one-way conduction from the first refrigerant pipeline 201 to the second gas interface pipeline 102, the pipeline where the first refrigerant pipeline 201 is located between the first auxiliary pipeline 203 and the first gas interface pipeline 101 is provided with a second one-way valve for controlling the one-way conduction from the first gas interface pipeline 101 to the indoor unit, the pipeline where the first refrigerant pipeline 201 is located between the first auxiliary pipeline 203 and the indoor unit is provided with a first on-off valve body, the pipeline where the second refrigerant pipeline 202 is located between the second auxiliary pipeline 204 and the indoor unit is provided with a second on-off valve body, the pipeline where the second refrigerant pipeline 202 is located between the second auxiliary pipeline 204 and the first liquid interface pipeline 103 is provided with a third one-way valve for controlling the one-way conduction from the indoor unit to the first liquid interface pipeline 103, and the second auxiliary pipeline 204 is provided with a fourth one-way valve for controlling the one-way conduction from the second liquid interface pipeline 104 to the first refrigerant pipeline 201. The above is only an exemplary introduction to the setting mode of the one-way valve and the on-off valve body, and the specific selection can be made according to the actual needs, which is not limited in the present application.

[0133] The metal refrigerant pipeline 200 can further comprise a pressure relief pipeline 500, one end of which is communicated with the indoor unit and the other end of which is communicated with the second gas interface pipeline 102. The pressure relief pipeline 500 is used to conduct the indoor unit and the second gas interface pipeline 102 when the pressure of the indoor unit is abnormal, so as to adjust the pressure of the indoor unit.

[0134] The embodiment of the present application further provides a refrigerant switching device, which comprises a refrigerant switching shell and the pipeline structure 10 as described above, and the pipeline structure 10 is arranged in the internal space of the refrigerant switching shell.

[0135] The pipeline segment of the pipeline structure 10 for communicating with the external pipeline interface can extend out of the refrigerant switching shell and be fixedly installed on the refrigerant switching shell, so that the pipeline structure 10 is assembled with the external pipeline interface. The external pipeline interface can comprise the pipeline interface of the heating and ventilation system such as the indoor unit, the outdoor unit or the hydraulic module.

[0136] The refrigerant switching device further comprises a support member arranged in the internal space of the refrigerant switching shell, and the metal refrigerant pipeline 200 and the metal interface pipeline 100 of the pipeline structure 10 can be supported or fixedly installed on the support member. The support member provides support for the metal refrigerant pipeline 200 and the metal interface pipeline 100 to prevent deformation.

[0137] The embodiment of the present application further provides a heating and ventilation system, which comprises an outdoor unit, an indoor unit and the refrigerant switching device as described above. The pipeline structure 10 of the refrigerant switching device communicates the outdoor unit and the indoor unit and forms a heating cycle and a refrigeration cycle.

[0138] The heating cycle comprises the outdoor unit, the first gas interface pipe 101, the first refrigerant pipe 201, the indoor unit, the second refrigerant pipe 202, the first liquid interface pipe 103, and the outdoor unit connected in sequence.

[0139] The refrigeration cycle comprises the outdoor unit, the second liquid interface pipe 104, the third heat exchange pipe, the indoor unit, the fourth heat exchange pipe, the second gas interface pipe 102, and the outdoor unit connected in sequence.

[0140] At least one of the first gas interface pipe 101, the second gas interface pipe 102, the first liquid interface pipe 103, and the second liquid interface pipe 104 is formed by the metal interface pipe 100, and the first refrigerant pipe 201, the second refrigerant pipe 202, the third heat exchange pipe, and the fourth heat exchange pipe are formed by the metal refrigerant pipe 200.

[0141] Optionally, the heating and ventilation system comprises one outdoor unit, multiple indoor units, and one refrigerant switching device, the refrigerant switching device collects and divides the heat exchange medium between the one outdoor unit and the multiple indoor units, so that the heating and ventilation system has four working modes, i.e., the full heating mode, the full refrigeration mode, the main heating mode, and the main refrigeration mode.

[0142] In the drawings of the embodiments, the same or similar reference numerals correspond to the same or similar components; in the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the terms describing the positional relationships in the drawings are only used for exemplary illustration, and cannot be understood as a limitation on the present patent, for those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0143] The above description is only the preferred embodiments of the present application, and is not intended to limit the present application, any modification, equivalent replacement, and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A pipeline structure, characterized in that, For a refrigerant switching device, the piping structure includes: Multiple metal refrigerant pipes, each of which includes a connecting pipe section; and A metal interface pipe includes a main body with multiple transition branches, each of which is connected to a connecting pipe section, so that the heat exchange medium in the internal flow channel of the main body can enter and exit the internal flow channel of the corresponding metal refrigerant pipe at each of the transition branches. The connecting pipe section has a hardness of H1, and the transition branch has a hardness of H2, where H2 ≥ H1.

2. The pipeline structure according to claim 1, characterized in that, The main body includes a main section, and the transition support is a transition flange protruding from the outer peripheral wall of the main section; The connecting pipe section is sleeved with the transition flange so that the internal flow channel of the main pipe is connected to the internal flow channel of the metal refrigerant pipe.

3. The pipeline structure according to claim 2, characterized in that, The connecting pipe section is inserted into the transition branch; or... The connecting pipe section is fitted around the outer periphery of the transition flange.

4. The pipeline structure according to claim 2, characterized in that, The end of the connecting pipe section is in contact with the outer peripheral wall of the main pipe section.

5. The pipeline structure according to claim 2, characterized in that, The transition flange is integrally formed with the main pipe section; The material of the transition flange is stainless steel; The main pipe section is made of stainless steel. The material of the connecting pipe section is at least one of stainless steel, copper alloy, copper, aluminum alloy, and aluminum.

6. The pipeline structure according to claim 1, characterized in that, The metal interface pipe includes a transition end pipe disposed at the end of the main body, and the metal interface pipe also includes a filter installed on the transition end pipe, the filter including a filter screen to filter the heat exchange medium entering and leaving the main body.

7. The pipeline structure according to claim 6, characterized in that, The filter is located inside the adapter pipe; or, The filter is located between the adapter pipe and the main pipe.

8. The pipeline structure according to claim 7, characterized in that, The filter is located between the adapter pipe and the main pipe. The metal interface tube further includes a first transition portion, which is located at the axial end of the main body. The main body is made of stainless steel, while the first transition portion is made of a material different from stainless steel. The filter has a first connector that is radially overlapped with the first transition portion. The radially overlapping portion of the first connector and the radially overlapping portion of the first transition portion are made of the same material or have the same main component material.

9. The pipeline structure according to claim 8, characterized in that, The material of the radially overlapping portion of the first joint is copper or a copper alloy, and the material of the radially overlapping portion of the first transition portion is copper or a copper alloy; or The material of the radially overlapping portion of the first joint is either aluminum or an aluminum alloy, and the material of the radially overlapping portion of the first transition portion is either aluminum or an aluminum alloy.

10. The pipeline structure according to claim 8, characterized in that, The filter includes a second connector that is radially overlapped with the adapter tube. The radially overlapping portion of the second connector and the radially overlapping portion of the adapter tube are made of the same material or have the same main components.

11. The pipeline structure according to claim 10, characterized in that, The material of the radially overlapping portion of the second connector is either copper or a copper alloy, and the material of the radially overlapping portion of the adapter tube is either copper or a copper alloy; or The material of the radially overlapping portion of the second connector is either aluminum or an aluminum alloy, and the material of the radially overlapping portion of the adapter tube is either aluminum or an aluminum alloy.

12. The pipeline structure according to claim 11, characterized in that, The adapter tube includes a main pipe and a second transition section connected to the main pipe. The main pipe is made of stainless steel, and the second transition section is made of a different material than stainless steel. The second transition section is radially overlapped with the second connector.

13. The pipeline structure according to claim 11, characterized in that, The radially overlapping portion of the second connector is made of copper or a copper alloy, and the adapter tube is also made of copper or a copper alloy. The axial end of the adapter tube is radially overlapped with the second connector via solder; or The material of the radially overlapping portion of the second connector is either aluminum or an aluminum alloy, and the material of the adapter tube is either aluminum or an aluminum alloy. The axial end of the adapter tube is radially overlapped with the second connector by solder.

14. The pipeline structure according to claim 10, characterized in that, The filter includes a tank made of stainless steel. The first connector and the second connector are respectively welded to the two axial ends of the tank. The main component of the first connector and the second connector is copper.

15. The pipeline structure according to claim 1, characterized in that, The main body is made of stainless steel, and the connecting pipe section is made of at least one of copper, copper alloy, aluminum, and aluminum alloy. The metal interface pipe further includes: A first transition section is provided at the axial end of the main body, and the material of the first transition section is any one of copper, copper alloy, aluminum, and aluminum alloy; The adapter tube is connected to the first transition section.

16. The pipeline structure according to claim 15, characterized in that, The axial end of the adapter tube is radially overlapped with the first transition portion, and the radially overlapping portion of the axial end of the adapter tube and the radially overlapping portion of the first transition portion are made of the same material.

17. The pipeline structure according to claim 16, characterized in that, The adapter tube is made of any one of copper, copper alloy, aluminum, or aluminum alloy.

18. The pipeline structure according to claim 15, characterized in that, The adapter tube includes a main section and a second transition section. The main section is made of stainless steel, and the second transition section is made of the same material as the first transition section or has the same main component material. The first transition section and the second transition section overlap radially.

19. The pipeline structure according to claim 1, characterized in that, The pipeline structure includes multiple metal interface pipes; The main bodies of the multiple metal interface pipes are parallel and arranged side by side with intervals in a direction perpendicular to the length direction of the main body; The connecting pipe section includes a first section connected to the main pipe body. The first section is a straight pipe, and the first sections of multiple metal refrigerant pipes connected to the same metal interface pipe are arranged in parallel.

20. The pipeline structure according to any one of claims 1 to 19, characterized in that, The piping structure includes a first gas interface pipe, and the metal refrigerant pipe includes a first refrigerant pipe connected to the first gas interface pipe. Each of the first refrigerant pipes is connected to the indoor unit to deliver a high-temperature gaseous heat exchange medium to the indoor unit. The piping structure includes a first liquid interface pipe, and the metal refrigerant pipe includes a second refrigerant pipe connected to the first liquid interface pipe. Each second refrigerant pipe is used to communicate with the indoor unit to receive the medium-temperature liquid heat exchange medium returned by the indoor unit. The piping structure includes a second liquid interface pipe, and the metal refrigerant pipe includes a third heat exchange pipe connected to the second liquid interface pipe. Each of the third heat exchange pipes is used to communicate with the indoor unit to deliver a low-temperature liquid heat exchange medium to the indoor unit. The piping structure includes a second gas interface pipe, and the metal refrigerant pipe includes a fourth heat exchange pipe connected to the second gas interface pipe. Each of the fourth heat exchange pipes is used to communicate with the indoor unit to receive the high-temperature gaseous heat exchange medium returned by the indoor unit. Wherein, at least one of the first gas interface tube, the second gas interface tube, the first liquid interface tube, and the second liquid interface tube is formed of the metal interface tube.

21. The pipeline structure according to claim 20, characterized in that, The metal refrigerant pipe used to communicate with the same indoor unit includes the first refrigerant pipe and the second refrigerant pipe; The first refrigerant pipe is reused as the fourth heat exchange pipe. The metal refrigerant pipe also includes a first auxiliary pipe, one end of which is connected to the first refrigerant pipe and the other end of which is connected to the second gas interface pipe. The second refrigerant pipe is reused as the third heat exchange pipe. The metal refrigerant pipe also includes a second auxiliary pipe, one end of which is connected to the second liquid interface pipe and the other end of which is connected to the second refrigerant pipe.

22. A pipeline structure, characterized in that, For a refrigerant switching device, the piping structure includes: Multiple metal refrigerant pipes, each of which includes a connecting pipe section; and A metal interface pipe includes a main body with multiple transition branches, each transition branch being connected to a connecting pipe section, so that the heat exchange medium in the internal flow channel of the main body can enter and exit the internal flow channel of the corresponding metal refrigerant pipe at each transition branch; wherein, the connecting pipe section is made of stainless steel.

23. A refrigerant switching device, characterized in that, include: Refrigerant switching housing; and The piping structure as described in any one of claims 1-22, wherein the piping structure is disposed within the internal space of the refrigerant switching housing.

24. A heating, ventilation, and air conditioning system, characterized in that, include: Outdoor unit; Indoor unit; and The refrigerant switching device as described in claim 23, wherein the piping structure of the refrigerant switching device connects the outdoor unit and the indoor unit, and forms a heating cycle and a cooling cycle.

25. The HVAC system according to claim 24, characterized in that, The heating cycle includes an outdoor unit connected in sequence: a first gas interface pipe, a first refrigerant pipe, an indoor unit, a second refrigerant pipe, a first liquid interface pipe, and an outdoor unit. The refrigeration cycle includes an outdoor unit, a second liquid interface pipe, a third heat exchange pipe, an indoor unit, a fourth heat exchange pipe, a second gas interface pipe, and an outdoor unit connected in sequence. At least one of the first gas interface pipe, the second gas interface pipe, the first liquid interface pipe, and the second liquid interface pipe is formed of the metal interface pipe, and the first refrigerant pipe, the second refrigerant pipe, the third heat exchange pipe, and the fourth heat exchange pipe are formed of the metal refrigerant pipe.

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