Refrigerant switching device and heating and ventilation equipment

Abstract

The utility model provides a refrigerant switching device and heating and ventilation equipment, the refrigerant switching device comprises a shell and a piping assembly, the piping assembly is installed on the shell, and the piping assembly comprises a main pipe assembly, multiple sets of branch pipe units and a filtering module; the header pipe assembly is used for communicating with an outdoor unit. Each branch pipe unit comprises a branch pipe and an expansion valve arranged on the branch pipe, and the branch pipe is communicated with the main pipe assembly and used for being communicated with an indoor unit; the filtering module is arranged in the main pipe assembly and used for filtering refrigerants entering the multiple sets of branch pipe units and filtering refrigerants flowing out of the multiple sets of branch pipe units. The refrigerant switching device is small in occupied space and low in manufacturing cost.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and in particular to a refrigerant switching device and HVAC equipment using the refrigerant switching device. Background Technology

[0002] Currently, multi-split central air conditioning systems are commonly used in some small and medium-sized buildings and public buildings, such as office buildings. A multi-split central air conditioning system refers to a system where one outdoor unit is connected to two or more indoor units via piping. A typical multi-split central air conditioning system includes an outdoor unit, a refrigerant switching device, and multiple indoor units. The main function of the refrigerant switching device is to allow the indoor units to switch between different modes. The outdoor unit is connected to the refrigerant switching device via liquid lines, low-pressure gas lines, and high-pressure gas lines, and each indoor unit is connected to the refrigerant switching device via liquid lines and gas lines.

[0003] In related technologies, a refrigerant switching device includes a housing and a refrigerant switching device disposed on the housing. The refrigerant switching device has a main pipe and branch pipes. The main pipe is connected to the outdoor unit, and the branch pipes are connected to the main pipe. The cooling or heating mode of the corresponding indoor unit is realized by the refrigerant flow in each branch pipe. In order to control the refrigerant flow in the branch pipes, an electronic expansion valve is usually installed on each branch pipe. Moreover, in order to maintain the performance of the electronic expansion valve, filters are installed on both the upstream and downstream sides of the electronic expansion valve.

[0004] However, in the aforementioned refrigerant switching device, the presence of filters on both the upstream and downstream sides of each electronic expansion valve results in a larger space requirement and higher manufacturing costs. Utility Model Content

[0005] This application provides a refrigerant switching device and HVAC equipment to solve the problem in related technologies that the refrigerant switching device occupies a large space and has a high manufacturing cost due to the filter setting of the electronic expansion valve.

[0006] On one hand, this application provides a refrigerant switching device, including a housing and a piping assembly. The piping assembly is installed in the housing and includes a main pipe assembly, multiple branch pipe units, and a filter module. The main pipe assembly is used to connect to an outdoor unit. Each branch pipe unit includes a branch pipe and an expansion valve installed on the branch pipe. The branch pipe is connected to the main pipe assembly and is used to connect to an indoor unit. The filter module is disposed in the main pipe assembly and is used to filter the refrigerant entering the multiple branch pipe units and to filter the refrigerant flowing out of the multiple branch pipe units.

[0007] As an optional implementation, the main pipe assembly includes multiple main pipes, each including a liquid pipe, a low-pressure gas pipe, and a high-pressure gas pipe; the filter module includes three filter elements: a first filter element, a second filter element, and a third filter element. The first filter element is disposed within the liquid pipe, the second filter element is disposed within the low-pressure gas pipe, and the third filter element is disposed within the high-pressure gas pipe. Specifically, the first filter element is used to filter refrigerant entering the multiple branch pipe units, or to filter refrigerant flowing out of the multiple branch pipe units, or to filter refrigerant entering and flowing out of some of the multiple branch pipe units; the second filter element is used to filter refrigerant flowing out of the multiple branch pipe units; and the third filter element is used to filter refrigerant entering the multiple branch pipe units.

[0008] In this way, when each indoor unit is in different modes, the filter module can also filter the refrigerant flowing into and out of the multiple branch pipe units.

[0009] As an alternative implementation, each main pipe includes a main body and two connectors respectively connected to opposite ends of the main body, the connectors passing through the housing; in a main pipe, the main body is connected and communicates with multiple sets of branch pipe units, and a filter element is provided in one of the two connectors.

[0010] This allows the filter element to be placed in an appropriate position based on the material selection of the connector and the main body.

[0011] As an optional implementation, the filter element includes an annular connecting plate and a filter screen connected to the annular connecting plate; the annular connecting plate is connected to the inner wall of the connector.

[0012] This allows for the connection between the filter element and the connector.

[0013] As an optional implementation, a positioning structure is provided between the annular connecting plate and the inner wall of the connector, the positioning structure being used to limit the position of the filter element in the axial direction of the main pipe.

[0014] This allows for the determination of the filter element's position along the main pipe's axial direction, thereby improving the reliability of the connection between the filter element and the main pipe.

[0015] As an optional implementation, the positioning structure includes two first positioning parts, both of which are connected to the inner wall of the connector and are spaced apart along the axial direction of the main pipe; at least two opposite sides of the annular connecting plate are sandwiched between the two first positioning parts.

[0016] In this way, the position of the filter element can be defined by setting two first positioning parts.

[0017] As an alternative implementation, the first positioning part is in a closed loop along the circumference of the main pipe.

[0018] This not only makes the installation efficiency of the filter element higher, but also makes the assembly efficiency of the refrigerant switching device provided in this application higher.

[0019] As an optional implementation, the first positioning part includes a plurality of first positioning blocks arranged at circumferential intervals along the main pipe.

[0020] This reduces the weight of the piping assembly, and further reduces the weight of the refrigerant switching device provided in this application.

[0021] As an optional implementation, the connector includes a first connector segment and a second connector segment, with the first connector segment connected between the main body and the second connector segment; the positioning structure includes a second positioning part formed within the first connector segment, and at least two opposite sides of the annular connecting plate are sandwiched between the second connector segment and the second positioning part.

[0022] In this way, even when the joint is long, the position of the filter element can still be limited.

[0023] As an optional implementation, the second positioning part is in a closed loop along the circumference of the first connector section.

[0024] This not only makes the installation efficiency of the filter element higher, but also makes the assembly efficiency of the refrigerant switching device provided in this application higher.

[0025] As an optional implementation, the second positioning part includes a plurality of second positioning blocks arranged circumferentially spaced along the first joint section.

[0026] This reduces the weight of the piping assembly, and further reduces the weight of the refrigerant switching device provided in this application.

[0027] As an optional implementation, the second positioning part is in a closed loop along the circumference of the first connector section; the first connector section includes a first pipe section, a second pipe section, and a third pipe section, the first pipe section is connected to the main body, and the second pipe section is connected between the first pipe section and the third pipe section; wherein, the diameter of the first pipe section is smaller than the diameter of the third pipe section, and the diameter of the second pipe section gradually increases in the direction from the first pipe section to the third pipe section, so that the inner wall of the second pipe section forms the second positioning part; the second connector section extends into the third pipe section and connects with the third pipe section, so that the annular connecting plate is clamped between the second connector section and the second positioning part.

[0028] In this way, the shape of the first connector section itself can be used to form the second positioning part, which can reduce the installation cost of the filter element and improve the installation efficiency of the filter element, thereby further reducing the assembly cost of the refrigerant switching device provided in this application and improving the assembly efficiency of the refrigerant switching device provided in this application.

[0029] As an optional implementation, the diameters of both the low-pressure and high-pressure air pipes are larger than the diameter of the liquid pipe; the filter module is installed inside the low-pressure and high-pressure air pipes.

[0030] This results in a lower manufacturing cost for the refrigerant switching device provided in this application.

[0031] As an alternative implementation, the piping assembly also includes a support beam; the support beam is connected to the housing and is used to mount the main pipe assembly and multiple branch pipe units.

[0032] This not only enables the main pipe assembly and multiple branch pipe units to bear loads, but also allows the piping assembly to be modularly designed, making it easy to assemble onto the housing and improving the assembly efficiency of the refrigerant switching device provided in this application.

[0033] On the other hand, this application provides a heating, ventilation and air conditioning (HVAC) device, including the aforementioned refrigerant switching device.

[0034] In the refrigerant switching device and HVAC equipment provided in this application embodiment, by setting the filter module in the main pipe assembly, the refrigerant flowing to each expansion valve and the refrigerant flowing out of each expansion valve are filtered. Compared with the prior art, the space for setting the filter is reduced, and the use cost of the filter module is reduced by setting the filter module only in the main pipe assembly, thereby reducing the manufacturing cost of the refrigerant switching device provided in this embodiment. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 An exploded view of the refrigerant switching device provided in the embodiments of this application;

[0037] Figure 2 This is a schematic diagram of a partial structure of the refrigerant switching device provided in an embodiment of this application;

[0038] Figure 3A schematic diagram of a partial structure of the piping assembly in the refrigerant switching device provided in this application embodiment;

[0039] Figure 4 for Figure 3 A schematic diagram of the planar structure along direction A;

[0040] Figure 5 A simplified schematic diagram of the piping assembly in the refrigerant switching device provided in the embodiments of this application;

[0041] Figure 6 A diagram showing the refrigerant flow direction of each indoor unit in the HVAC equipment provided in this application embodiment, all in cooling mode;

[0042] Figure 7 A diagram showing the refrigerant flow direction of each indoor unit in heating mode in the HVAC equipment provided in this application embodiment;

[0043] Figure 8 A diagram showing the refrigerant flow direction of a majority of indoor units in the cooling state in the HVAC equipment provided in this application embodiment;

[0044] Figure 9 A diagram showing the refrigerant flow direction of a majority of indoor units in heating mode in an embodiment of this application;

[0045] Figure 10 A schematic diagram illustrating one installation method between the main pipe and the filter element in the refrigerant switching device provided in this application embodiment;

[0046] Figure 11 for Figure 10 Enlarged schematic diagram of the local structure at point B;

[0047] Figure 12 A schematic diagram illustrating another installation method between the main pipe and the filter element in the refrigerant switching device provided in this application embodiment;

[0048] Figure 13 for Figure 12 A magnified schematic diagram of the local structure at point C.

[0049] Explanation of reference numerals in the attached figures:

[0050] 1. Housing; 2. Piping assembly; 3. Sensor; 4. Electrical control module; 5. Filter module; 6. Positioning structure;

[0051] 11. Top plate; 12. Chassis; 13. First side plate; 14. Second side plate; 15. Mounting cavity; 21. Main pipe assembly; 22. Branch pipe unit; 23. First branch liquid pipe; 24. Second branch liquid pipe; 25. Third branch liquid pipe; 26. Plate heat exchanger; 27. Refrigerator; 28. Support beam; 51. First filter element; 52. Second filter element; 53. Third filter element; 61. First positioning part; 62. Second positioning part;

[0052] 151. First cavity; 152. Second cavity; 211. Liquid pipe; 212. Low-pressure gas pipe; 213. High-pressure gas pipe; 210. Main body; 220. Connector; 221. Branch pipe; 222. Expansion valve; 223. First check valve; 224. Second check valve; 225. Pressure relief valve; 510. Annular connecting plate; 520. Filter screen; 611. First stop surface; 621. Second stop surface;

[0053] 2201, First connector section; 2202, Second connector section; 2203, First pipe section; 2204, Second pipe section; 2205, Third pipe section; 2211, Liquid pipe branch pipe; 2212, Bypass liquid pipe branch pipe; 2213, Gas pipe branch pipe; 2214, Bypass gas pipe branch pipe; 2215, Pressure relief branch pipe. Detailed Implementation

[0054] The principles and features of this application are described below with reference to the accompanying drawings. The examples given are only for explaining this application and are not intended to limit the scope of this application.

[0055] Currently, multi-split central air conditioning systems are commonly used in some small and medium-sized buildings and public buildings, such as office buildings. A multi-split central air conditioning system refers to a system where one outdoor unit is connected to two or more indoor units via piping. A typical multi-split central air conditioning system includes an outdoor unit, a refrigerant switching device, and multiple indoor units. The main function of the refrigerant switching device is to allow the indoor units to switch between different modes. The outdoor unit is connected to the refrigerant switching device via liquid lines, low-pressure gas lines, and high-pressure gas lines, and each indoor unit is connected to the refrigerant switching device via liquid lines and gas lines.

[0056] In related technologies, a refrigerant switching device includes a housing and a refrigerant switching mechanism disposed within the housing. The refrigerant switching mechanism has a main pipe and branch pipes. The main pipe connects to the outdoor unit, and the branch pipes are connected to the main pipe. The flow of refrigerant within each branch pipe controls the cooling or heating mode of the corresponding indoor unit. To control the refrigerant flow in the branch pipes, electronic expansion valves are typically installed on each branch pipe. Furthermore, to maintain the performance of the electronic expansion valves, filters are installed on both the upstream and downstream sides of each valve. However, in the aforementioned refrigerant switching device, the presence of filters on both the upstream and downstream sides of each electronic expansion valve results in a larger space requirement and higher manufacturing costs.

[0057] Therefore, this application provides a refrigerant switching device and HVAC equipment. By integrating the filter element inside the main pipe, the amount of filter element used is reduced, which improves the internal structural compactness of the refrigerant switching device and reduces the manufacturing cost of the refrigerant switching device.

[0058] The HVAC equipment provided in this embodiment includes an outdoor unit, a refrigerant switching device, and multiple indoor units. The refrigerant switching device is installed between the outdoor unit and the multiple indoor units to transfer refrigerant, thereby enabling the indoor units to switch between different modes.

[0059] It should be noted that the refrigerant switching device will be described in detail in the following implementation methods.

[0060] The refrigerant switching device provided in the embodiments of this application will be described in detail below with reference to the accompanying drawings and specific implementation details.

[0061] Please see Figures 1 to 4 , Figure 1 This is an exploded view of the refrigerant switching device provided in the embodiments of this application. Figure 2 This is a schematic diagram of a partial structure of the refrigerant switching device provided in an embodiment of this application. Figure 3 This is a schematic diagram of a partial structure of the piping assembly in the refrigerant switching device provided in an embodiment of this application. Figure 4 for Figure 3 A schematic diagram of the planar structure along direction A. As shown in the figure, this embodiment provides a refrigerant switching device, including a housing 1. The housing 1 includes a top plate 11, a chassis 12, two first side plates 13, and two second side plates 14. The top plate 11 and the chassis 12 are arranged opposite each other along the height direction of the refrigerant switching device, and the top plate 11 is located above the chassis 12. The two first side plates 13 are arranged opposite each other along the length direction of the refrigerant switching device, and the two second side plates 14 are arranged opposite each other along the width direction of the refrigerant switching device. The two first side plates 13 and the two second side plates 14 surround the periphery of the top plate 11 and are detachably connected to the chassis 12 to form an installation cavity 15.

[0062] Please combine Figure 5 , Figure 5 This is a piping structure diagram of the piping assembly in the refrigerant switching device provided in this embodiment. To facilitate refrigerant delivery, the refrigerant switching device provided in this embodiment should also include a piping assembly 2 installed on the housing 1. The piping assembly 2 includes a main pipe assembly 21 and multiple branch pipe units 22. The main pipe assembly 21 is used to connect to the outdoor unit. Each branch pipe unit 22 includes a branch pipe 221 and an expansion valve 222 installed on the branch pipe 221. The branch pipe 221 connects to the main pipe assembly 21 and is used to connect to an indoor unit.

[0063] Specifically, the main pipe assembly 21 includes multiple main pipes, including a liquid pipe 211, a low-pressure gas pipe 212, and a high-pressure gas pipe 213.

[0064] Furthermore, in order to connect the main pipe assembly 21 with multiple branch pipe units 22, a first branch liquid pipe 23 is connected to the liquid pipe 211. In order to improve the cooling effect of the indoor unit in cooling mode and increase the subcooling of the entire system, a plate heat exchanger 26 is connected to the first branch liquid pipe 23 through an inlet pipe. The plate heat exchanger 26 is connected to the second branch liquid pipe 24 through an outlet pipe and an inlet pipe, and the plate heat exchanger 26 is connected to the third branch liquid pipe 25 through an outlet pipe.

[0065] Each branch pipe 221 in each branch pipe unit 22 includes a liquid pipe branch pipe 2211 that connects the first branch liquid pipe 23 to the liquid pipe of the indoor unit. The liquid pipe branch pipe 2211 and the second branch liquid pipe 24 are connected through a bypass liquid pipe branch pipe 2212. A first one-way valve 223 is provided on the liquid pipe branch pipe 2211 at the joint with the first branch liquid pipe 23 and at the joint with the bypass liquid pipe branch pipe 2212. A second one-way valve 224 is provided on the bypass liquid pipe branch pipe 2212. The high-pressure gas pipe 213 is connected to the gas pipe of the indoor unit through the gas pipe branch pipe 2213, and the gas pipe branch pipe 2213 is connected to the low-pressure gas pipe 212 through a bypass gas pipe branch pipe 2214.

[0066] Expansion valves 222 are installed on the liquid pipe branch 2211, the gas pipe branch 2213 and the bypass gas pipe branch 2214 to regulate the flow rate of the refrigerant.

[0067] Furthermore, a cooler 27 is provided between the second branch liquid pipe 24 and the plate heat exchanger 26. The cooler 27 is provided to cool the refrigerant flowing in the second branch liquid pipe 24 to the refrigerant flowing in the third branch liquid pipe 25.

[0068] In addition, a pressure relief branch pipe 2215 is connected between the liquid pipe branch pipe 2211 and the low-pressure gas pipe 212. A pressure relief valve 225 is installed on the pressure relief branch pipe 2215. When the pressure of the indoor unit is high, the pressure relief valve 225 will open.

[0069] Understandably, in order to install the piping assembly 2 onto the housing 1, the piping assembly 2 may also include a support beam 28, with both ends of the support beam 28 connected to two first side plates 13 along its own extension direction, and the support beam 28 is used to support the main pipe assembly 21 and multiple sets of branch pipe units 22. In this way, not only can the main pipe assembly 21 and multiple sets of branch pipe units 22 be supported, but the piping assembly 2 also has a modular design, facilitating installation onto the housing 1, thereby improving the assembly efficiency of the refrigerant switching device provided in this embodiment.

[0070] It should be noted that in this embodiment, there may be two support beams 28. One of the two support beams 28 is used to carry the pipes for supplying liquid refrigerant in the main pipe assembly 21 and the multiple sets of branch pipe units 22, and the other is used to carry the pipes for supplying gaseous refrigerant in the main pipe assembly 21 and the multiple sets of branch pipe units 22.

[0071] To prevent refrigerant leakage, the refrigerant switching device provided in this embodiment can also be equipped with a sensor 3 for refrigerant detection. When the sensor 3 detects a refrigerant leak, the ventilation system can be activated. No limitations are placed on the ventilation system.

[0072] Furthermore, to enable the opening and closing of the expansion valve 222, the refrigerant switching device provided in this embodiment should also include an electronic control module 4. The mounting cavity 15 is formed with a first cavity 151 and a second cavity 152 spaced apart. Partial structures of the plate heat exchanger 26 and the piping assembly 2 are housed within the first cavity 151, and the electronic control module 4 is housed within the second cavity 152. The first cavity 151 and the second cavity 152 are distributed along the width direction of the refrigerant switching device. This ensures a certain distance between the plate heat exchanger 26 and the piping assembly 2 and the electronic control module 4, which can, to a certain extent, prevent refrigerant flowing in the plate heat exchanger 26 and the piping assembly 2 from leaking onto the electronic control module 4, ensuring the normal performance of the electronic control module 4.

[0073] Among them, the electronic control module 4 is a modular design, that is, the electronic control module 4 can be installed or disassembled separately from the housing 1. In other words, the electronic control module 4 can be composed of mounting parts, circuit boards and electrical components, etc. The mounting parts are installed between the top plate 11 and the chassis 12. The mounting parts, housing 1 and chassis 12 together form a cavity to accommodate the circuit board and electrical components.

[0074] It should be noted that a partition can also be provided on the chassis 12 or the top plate 11 to separate the first cavity 151 and the second cavity 152. In this case, the electronic control module can consist only of circuit boards and electrical components. Here, there are no restrictions on the specific implementation of the electronic control module 4.

[0075] It is understandable that during the use of the refrigerant switching device provided in this embodiment, if the refrigerant is not filtered during its flow, the expansion valve 222 will become clogged, thus affecting its performance. Therefore, in related technologies, filters are installed on both the upstream and downstream sides of the expansion valve on any branch pipe with an expansion valve. This results in both a larger space requirement and higher manufacturing costs for the refrigerant switching device.

[0076] Therefore, in order to achieve filtration of the refrigerant during its flow, the refrigerant switching device provided in this embodiment should also include a filter module 5. The filter module 5 is disposed in the main pipe assembly 21 and is used to filter the refrigerant entering the multiple branch pipe units 22 and to filter the refrigerant flowing out of the multiple branch pipe units 22. In this way, by placing the filter module in the main pipe assembly 21, the refrigerant flowing to and from each expansion valve 222 is filtered. Compared with the prior art, this reduces the space required for setting up filters, and by placing the filter module 5 only in the main pipe assembly 21, the cost of using the filter module 5 is reduced, thereby reducing the manufacturing cost of the refrigerant switching device provided in this embodiment.

[0077] Furthermore, the filter module 5 includes three filter elements: a first filter element 51, a second filter element 52, and a third filter element 53. The first filter element 51 is disposed in the liquid pipe 211, the second filter element 52 is disposed in the low-pressure gas pipe 212, and the third filter element 53 is disposed in the high-pressure gas pipe 213. The first filter element 51 is used to filter the refrigerant entering the multi-branch pipe unit 22, or to filter the refrigerant flowing out of the multi-branch pipe unit 22, or to filter the refrigerant entering and exiting a portion of the multi-branch pipe unit 22. The second filter element 52 is used to filter the refrigerant flowing out of the multi-branch pipe unit 22. The third filter element 53 is used to filter the refrigerant entering the multi-branch pipe unit 22.

[0078] The functions of the first filter element 51, the second filter element 52, and the third filter element 53 will be described in detail below based on the indoor unit in different modes and the direction of refrigerant flow.

[0079] Please combine Figures 6 to 9 , Figure 6 This is a refrigerant flow diagram showing the refrigerant flow of each indoor unit in the HVAC equipment provided in the embodiments of this application, all in cooling mode. Figure 7 A refrigerant flow diagram for each indoor unit in heating mode in the HVAC equipment provided in this application embodiment. Figure 8 This application provides a diagram showing the refrigerant flow direction of most indoor units in cooling mode within an HVAC system, as shown in the embodiments of this application. Figure 9 This is a diagram showing the refrigerant flow direction of a typical indoor unit in heating mode within an HVAC system provided in an embodiment of this application. For ease of description, [the diagram is shown here]. Figure 6 The operating mode of the indoor unit shown is called full cooling mode. Figure 7 The indoor unit shown is operating in a mode called full heating mode. Figure 8 The operating mode of the indoor unit shown is called the main cooling mode. Figure 9 The operating mode of the indoor unit shown is called the main heating mode.

[0080] like Figure 6 As shown, in full cooling mode, for each indoor unit, the first one-way valve 223 in its corresponding branch pipe unit 22 is closed, and the second one-way valve 224 is open. The refrigerant flow direction is: outdoor unit → first filter element 51 → liquid pipe 211 → plate heat exchanger 26 → second branch liquid pipe 24 → bypass liquid pipe branch pipe 2212 → liquid pipe branch pipe 2211 → indoor unit liquid pipe → indoor unit → indoor unit gas pipe → gas pipe branch pipe 2213 → bypass gas pipe branch pipe 2214 → low-pressure gas pipe 212 → second filter element 52 → outdoor unit. This completes one cooling cycle. In other words, in full cooling mode, the first filter element 51 and the second filter element 52 perform filtering functions. The first filter element 51 filters the refrigerant entering the multiple branch pipe units 22, and the second filter element 52 filters the refrigerant flowing out of the multiple branch pipe units 22.

[0081] like Figure 7 As shown, in full heating mode, for each indoor unit, the first one-way valve 223 in its corresponding branch pipe unit 22 is open, and the second one-way valve 224 is closed. The refrigerant flow direction is: outdoor unit → high-pressure gas pipe 213 → third filter 53 → gas pipe branch pipe 2213 → indoor unit gas pipe → indoor unit → indoor unit liquid pipe → liquid pipe branch pipe 2211 → first branch liquid pipe 23 → liquid pipe 211 → first filter 51 → outdoor unit. In this way, a heating cycle is completed. That is to say, in full cooling mode, the third filter 53 and the first filter 51 perform filtering functions. The third filter 53 is used to filter the refrigerant entering the multiple branch pipe units 22, and the first filter 51 is used to filter the refrigerant flowing out of the multiple branch pipe units 22.

[0082] like Figure 8As shown, in the main cooling mode, for the indoor unit in heating mode, the first one-way valve 223 in its corresponding branch pipe unit 22 is open, and the second one-way valve 224 is closed. The refrigerant flows as follows: outdoor unit → third filter 53 → high-pressure gas pipe 213 → gas pipe branch pipe 2213 → indoor unit gas pipe → indoor unit → indoor unit liquid pipe → liquid pipe branch pipe 2211 → first branch liquid pipe 23 → liquid pipe 211 → first filter 51 → outdoor unit. This completes one heating cycle. In other words, in the main cooling mode, for the indoor unit in heating mode, the third filter 53 filters the refrigerant entering the corresponding branch pipe unit 22 of the indoor unit, and the first filter 51 filters the refrigerant flowing out of the corresponding branch pipe unit 22 of the indoor unit.

[0083] For the indoor unit in cooling mode, the first one-way valve 223 in the corresponding branch pipe unit 22 is closed, and the second one-way valve 224 is open. The refrigerant flows in the following direction: outdoor unit → first filter element 51 → liquid pipe 211 → plate heat exchanger 26 → second branch liquid pipe 24 → bypass liquid pipe branch pipe 2212 → liquid pipe branch pipe 2211 → indoor unit liquid pipe → indoor unit → indoor unit gas pipe → gas pipe branch pipe 2213 → bypass gas pipe branch pipe 2214 → low-pressure gas pipe 212 → second filter element 52 → outdoor unit. After the refrigerant flows out from the plate heat exchanger 26, a portion of it will flow along the cooler 27 → third branch liquid pipe 25 → low-pressure gas pipe 212 → second filter element 52 → outdoor unit. Thus, a cooling cycle is completed. That is, in the main heating mode, for the indoor unit in cooling mode, the first filter 51 is used to filter the refrigerant entering the branch pipe unit 22 corresponding to the indoor unit, and the second filter 52 is used to filter the refrigerant flowing out of the branch pipe unit 22 corresponding to the indoor unit.

[0084] like Figure 9 As shown, in the main heating mode, for the indoor unit in heating mode, the first one-way valve 223 in its corresponding branch pipe unit 22 is open, and the second one-way valve 224 is closed. The refrigerant flows as follows: outdoor unit → third filter 53 → high-pressure gas pipe 213 → gas pipe branch pipe 2213 → indoor unit gas pipe → indoor unit → indoor unit liquid pipe → liquid pipe branch pipe 2211 → first branch liquid pipe 23 → liquid pipe 211 → first filter 51 → outdoor unit. This completes one heating cycle. In other words, in the main heating mode, for the indoor unit in heating mode, the third filter 53 filters the refrigerant entering the corresponding branch pipe unit 22 of the indoor unit, and the first filter 51 filters the refrigerant flowing out of the corresponding branch pipe unit 22 of the indoor unit.

[0085] For the indoor unit in cooling mode, during the operation of the indoor unit in heating mode, when the refrigerant flows to the liquid pipe 211, a portion will be diverted to the plate heat exchanger 26. The refrigerant flow direction is as follows: plate heat exchanger 26 → second branch liquid pipe 24 → bypass liquid pipe branch pipe 2212 → liquid pipe branch pipe 2211 → indoor unit liquid pipe → indoor unit → indoor unit gas pipe → gas pipe branch pipe 2213 → bypass gas pipe branch pipe 2214 → low-pressure gas pipe 212 → second filter element 52 → outdoor unit. After the refrigerant flows out of the plate heat exchanger 26, a portion of the refrigerant will flow to the cooler 27 → third branch liquid pipe 25 → low-pressure gas pipe 212 → second filter element 52 → outdoor unit. Thus, a cooling cycle is completed. That is, in the main heating mode, for the indoor unit in cooling mode, the first filter 51 is used to filter the refrigerant entering the branch pipe unit 22 corresponding to the indoor unit, and the second filter 52 is used to filter the refrigerant flowing out of the branch pipe unit 22 corresponding to the indoor unit.

[0086] It should be noted that, taking the four indoor units in this embodiment as an example, in the main cooling mode, three indoor units can be cooling and one indoor unit can be heating; in the main heating mode, three indoor units can be heating and one indoor unit can be cooling. No specific restrictions are placed on the number of indoor units or the actual cooling mode.

[0087] The specific structure of the filtering module 5 in this embodiment will be described in detail below.

[0088] Please combine Figures 10 to 13 , Figure 10 This is a schematic diagram illustrating one installation method between the main pipe and the filter element in the refrigerant switching device provided in this application embodiment. Figure 11 for Figure 10 A magnified view of the local structure at point B. Figure 12 This is a schematic diagram illustrating another installation method between the main pipe and the filter element in the refrigerant switching device provided in this application embodiment. Figure 13 for Figure 12 A magnified schematic diagram of the local structure at point C.

[0089] As shown in the figure, each main pipe includes a main body 210 and two connectors 220 connected to opposite ends of the main body 210. The connectors 220 can be welded to the main body 210 and pass through the first side plate 13 of the housing 1. In a main pipe, the main body 210 is connected and communicates with the branch pipes 221 in multiple sets of branch pipe units 22. A filter element is provided in one of the two connectors 220.

[0090] It should be noted that in this embodiment, since the pipe connecting the outdoor unit to the connector 220 is made of copper, the connector 220 is also made of copper. However, because stainless steel is less expensive than copper, the main body 210 is made of stainless steel. Since copper has lower hardness (i.e., relatively softer and more ductile), it is easier to install a filter inside the connector 220 than inside the main body 210. Therefore, in this specific embodiment, the filter is installed inside the connector 220.

[0091] Specifically, the filter element includes an annular connecting plate 510 and a filter screen 520 connected to the annular connecting plate 510; the annular connecting plate 510 is connected to the inner wall of the connector portion 220. In this way, the filter element can be installed inside the main pipe.

[0092] It should be noted that the annular connecting plate 510 and the filter screen 520 can be welded together. Considering cost and hardness, both the annular connecting plate 510 and the filter screen 520 can be made of stainless steel. This not only reduces the manufacturing cost of the refrigerant switching device provided in this embodiment but also prevents damage to the filter screen 520 from the impact force of the refrigerant. In some other embodiments, the annular connecting plate 510 and the filter screen 520 can also be connected by other methods such as bonding, and the annular connecting plate 510 and the filter screen 520 can also be made of other materials, such as copper. Here, no specific limitations are made on the connection method and manufacturing material between the annular connecting plate 510 and the filter screen.

[0093] In order to install the filter element into the main pipe, in some embodiments, a positioning structure 6 can be provided between the annular connecting plate 510 and the inner wall of the connector 220 to restrict the position of the filter element in the axial direction of the main pipe. In this way, a reliable connection between the filter element and the main pipe can be achieved.

[0094] like Figure 11 As shown, in one embodiment, the positioning structure 6 may include two first positioning parts 61, both of which are connected to the inner wall of the connector 220 and are spaced apart along the axial direction of the main pipe; at least two opposite sides of the annular connecting plate 510 are sandwiched between the two first positioning parts 61. Thus, when the opposite sides of the annular connecting plate 510 are sandwiched between the two first positioning parts 61, the position of the filter element in the axial direction of the main pipe can be defined, improving the connection reliability between the filter element and the connector 220 of the main pipe.

[0095] Specifically, in the actual manufacturing process, a first positioning part 61 is first formed on the inner wall of the connector 220 to form a first stop surface 611. Then, the filter element is pressed into the connector 220, so that the annular connecting plate 510 abuts against the first stop surface 611. Then, another first positioning part 61 is manufactured and formed on the outside, pressed onto the annular connecting plate 510, and welded to the inner wall of the connector 220. In this way, the installation of the filter element can be completed.

[0096] It is understandable that the first positioning part 61 can be in a closed loop along the circumference of the main pipe, that is, the first positioning part 61 can also be in the shape of an annular plate. This method makes the assembly efficiency of the filter element higher.

[0097] Alternatively, the first positioning part 61 may also include a plurality of first positioning blocks (not shown in the figure) arranged circumferentially along the main pipe. That is, the two first positioning parts 61 are divided into multiple small blocks. This results in lower assembly efficiency of the filter element, but requires less material, making the overall weight of the refrigerant switching device provided in this embodiment lighter and easier to install and transport. In this embodiment, the specific shape of the first positioning part 61 is not limited.

[0098] like Figure 12 and Figure 13 As shown, in some embodiments, if the outdoor unit is far from the refrigerant switching device, the required length of the connector 220 will be longer. In this case, the connector 220 may include a first connector segment 2201 and a second connector segment 2202, with the first connector segment 2201 connected between the main body 210 and the second connector segment 2202. The positioning structure 6 includes a second positioning part 62 formed within the first connector segment 2201, with at least two opposite sides of the annular connecting plate 510 sandwiched between the second connector segment 2202 and the second positioning part 62. This also allows for the limitation of the axial position of the filter element in the connector 220, improving the connection reliability between the filter element and the connector 220.

[0099] Specifically, in the actual manufacturing process, a second positioning part 62 is first formed on the inner wall of the first connector section 2201 to form a second stop surface 621. Then, the filter element is pressed into the first connector section 2201, so that the annular connecting plate 510 abuts against the second stop surface 621. Then, the second connector section 2202 is pressed onto the annular connecting plate 510 and welded to the inner wall of the first connector section 2201. In this way, the installation of the filter element can be completed.

[0100] It is understandable that the second positioning part 62 can be in a closed loop along the circumference of the first connector section 2201. In other words, the second positioning part 62 can also be in the shape of an annular plate. This method makes the assembly efficiency of the filter element higher.

[0101] Alternatively, the second positioning part 62 may include a plurality of second positioning blocks spaced circumferentially along the first connector section 2201. In other words, the second positioning part 62 is divided into multiple small blocks. This results in lower assembly efficiency for the filter element, but requires less material, making the overall weight of the refrigerant switching device provided in this embodiment lighter and facilitating installation and transportation. In this embodiment, the specific shape of the second positioning part 62 is not limited.

[0102] When the second positioning part 62 is in a closed loop along the circumference of the first connector section 2201, the first connector section 2201 may include a first pipe section 2203, a second pipe section 2204, and a third pipe section 2205. The first pipe section 2203 is connected to the main body 210, and the second pipe section 2204 is connected between the first pipe section 2203 and the third pipe section 2205. The diameter of the first pipe section 2203 is smaller than the diameter of the third pipe section 2205, and the diameter of the second pipe section 2204 gradually increases in the direction from the first pipe section 2203 to the third pipe section 2205, so that the inner wall of the second pipe section 2204 forms the second positioning part 62. The second connector section 2202 extends into the third pipe section 2205 and connects with the third pipe section 2205, so that the annular connecting plate 510 is clamped between the second connector section 2202 and the second positioning part 62.

[0103] In this way, it is not necessary to set a separate second positioning part 62 in the first connector section 2201. The second positioning part 62 can be formed by the shape of the first connector section 2201 itself. On the one hand, it can reduce the installation cost of the filter element, and on the other hand, it can improve the installation efficiency of the filter element. This can reduce the installation cost of the refrigerant switching device provided in this embodiment and improve the assembly efficiency of the refrigerant switching device provided in this embodiment.

[0104] It is understandable that the diameters of both the low-pressure gas pipe 212 and the high-pressure gas pipe 213 are larger than the diameter of the liquid pipe 211. In other words, it is more difficult to place the filter element inside the liquid pipe 211. Therefore, in order to control the manufacturing cost of the refrigerant switching device provided in this embodiment, the filter module 5 is only placed inside the low-pressure gas pipe 212 and the high-pressure gas pipe 213. That is, it is sufficient to place the second filter element 52 inside the low-pressure gas pipe 212 and the third filter element 53 inside the high-pressure gas pipe 213.

[0105] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0106] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0107] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0108] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0109] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0110] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A refrigerant switching device characterized by comprising: The application relates to a refrigerant pipe assembly. The application relates to a refrigerant pipe assembly. The application relates to a refrigerant pipe assembly. The application relates to a refrigerant pipe assembly. The application relates to a refrigerant pipe assembly. The application relates to a refrigerant pipe assembly. The application relates to a refrigerant pipe assembly.

2. The refrigerant switching device according to claim 1, characterized by The application relates to a refrigerant pipe assembly. The application relates to a refrigerant pipe assembly. The application relates to a refrigerant pipe assembly. The application relates to a refrigerant pipe assembly. The application relates to a refrigerant pipe assembly.

3. The refrigerant switching device according to claim 2, characterized by The application relates to a refrigerant pipe assembly. The application relates to a refrigerant pipe assembly.

4. The refrigerant switching device according to claim 3, characterized by The application relates to a refrigerant pipe assembly. The application relates to a refrigerant pipe assembly.

5. The refrigerant switching device according to claim 4, characterized by The application relates to a refrigerant pipe assembly.

6. The refrigerant switching device according to claim 5, characterized by The application relates to a refrigerant pipe assembly. The application relates to a refrigerant pipe assembly.

7. The refrigerant switching device according to claim 6, characterized by The application relates to a refrigerant pipe assembly. The application relates to a refrigerant pipe assembly.

8. The refrigerant switching device according to claim 5, characterized by The application relates to a refrigerant pipe assembly. The application relates to a refrigerant pipe assembly.

9. The refrigerant switching device according to claim 8, characterized by The application relates to a refrigerant pipe assembly.

10. The refrigerant switching device according to claim 9, characterized in that, The application relates to a refrigerant pipe assembly. The application relates to a refrigerant pipe assembly. The application relates to a refrigerant pipe assembly. The application relates to a refrigerant pipe assembly. The application relates to a refrigerant pipe assembly. The application relates to a refrigerant pipe assembly. The application relates to a refrigerant pipe assembly. The application relates to a refrigerant pipe assembly. The application relates to a refrigerant pipe assembly. The application relates to a refrigerant pipe assembly. The application relates to a refrigerant pipe assembly. The application relates to a refrigerant pipe assembly. The application relates to a refrigerant pipe assembly. The application relates to a refrigerant pipe assembly. The application relates to a refrigerant pipe assembly. The application relates to a refrigerant pipe assembly. 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11. The refrigerant switching device according to any one of claims 2 to 10, characterized in that, The pipe diameters of the low-pressure gas pipe and the high-pressure gas pipe are greater than the pipe diameter of the liquid pipe; The filter module is arranged in the low-pressure gas pipe and the high-pressure gas pipe.

12. The refrigerant switching device according to any one of claims 1 to 10, characterized in that, The pipe assembly further comprises a support cross beam; The support cross beam is connected with the shell, and the support cross beam is used for carrying the main pipe assembly and the plurality of groups of branch pipe units.

13. A heating and ventilation device, characterized in that The refrigerant switching device according to any one of claims 1 to 12.

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