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, a chassis, a piping assembly and a plate heat exchanger, and the chassis is arranged at the bottom of the shell and detachably connected with the shell; the piping assembly is used for communicating the outdoor unit with the indoor unit and is mounted on the shell; the plate heat exchanger communicates with the piping assembly and is installed on the piping assembly or the shell, and the plate heat exchanger is used for increasing the supercooling degree of the refrigerant flowing through the piping assembly. According to the refrigerant switching device, the internal piping assembly can be checked or overhauled conveniently.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioners, and particularly relates to a refrigerant switching device and a heating, ventilation and air conditioning (HVAC) device applying the refrigerant switching device. Background Art

[0002] Currently, in some small and medium-sized buildings and some public buildings, such as office buildings, the use of multi-connected central air conditioners is relatively common. A multi-connected central air conditioner refers to an outdoor unit connected to two or more indoor units through pipes. A multi-connected central air conditioner generally includes an outdoor unit, a refrigerant switching device, and multiple indoor units. The main function of the refrigerant switching device is to achieve the switching of indoor units in different modes. Among them, the outdoor unit is connected to the refrigerant switching device through a liquid pipe, a low-pressure gas pipe, and a high-pressure gas pipe, and each indoor unit is connected to the refrigerant switching device through a liquid pipe and a gas pipe.

[0003] Generally, in order to avoid the "flashing" phenomenon of the refrigerant during the flowing process, a plate heat exchanger is arranged in the refrigerant switching device to increase the subcooling degree. In the related art, the housing structure of the refrigerant switching device includes a top shell and a chassis. An installation cavity for accommodating pipes is formed by enclosing between the top shell and the chassis, and the plate heat exchanger is arranged on the chassis.

[0004] However, in the above refrigerant switching device, since the chassis cannot be disassembled separately, if it is necessary to repair the internal pipes, etc., the entire refrigerant switching device needs to be removed before the internal pipes can be repaired. In this way, not only the inspection or repair efficiency of the pipes will be reduced, but also the inspection or repair cost will be increased. Summary of the Utility Model

[0005] Embodiments of the present application provide a refrigerant switching device and an HVAC device, which are used to solve the problems of low efficiency and high cost when inspecting or repairing the internal pipes of the refrigerant switching device in the related art.

[0006] On the one hand, the present application provides a refrigerant switching device, which includes a housing, a chassis, a pipe assembly, and a plate heat exchanger. The chassis is arranged at the bottom of the housing and is detachably connected to the housing; the pipe assembly is used to connect the outdoor unit and the indoor unit and is installed in the housing; the plate heat exchanger is connected to the pipe assembly and is installed on the pipe assembly or the housing, and the plate heat exchanger is used to increase the subcooling degree of the refrigerant flowing through the pipe assembly.

[0007] As an optional implementation manner, the housing is in a cover structure and forms an open end facing downward, and the chassis covers the open end to enclose an installation cavity with the housing; part of the structures of the plate heat exchanger and the pipe assembly are arranged in the installation cavity.

[0008] In this way, by setting the housing-type shell, an installation cavity for accommodating part of the structures of the plate heat exchanger and the piping assembly can be formed, facilitating the installation of the plate heat exchanger, the piping assembly, and the shell.

[0009] As an alternative embodiment, the piping assembly includes a support crossbeam and a piping module. The support crossbeam is connected to the shell and is used to carry the piping module. The piping module is used to connect the outdoor unit and the indoor unit, and the plate heat exchanger is connected to the piping module and fixed on the support crossbeam.

[0010] With such a setting, the support crossbeam not only has the function of carrying the piping module but also can mount the plate heat exchanger on it. Thus, while ensuring that the chassis can be detached separately, the structure in the piping assembly can be reasonably utilized, reducing the setting cost of the plate heat exchanger.

[0011] As an alternative embodiment, the support crossbeam includes a first beam body and a second beam body distributed at intervals. The piping module includes a liquid pipe piping module and a gas pipe piping module. The first beam body is used to carry the liquid pipe piping module, and the second beam body is used to carry the gas pipe piping module. Among them, the plate heat exchanger is installed on either the first beam body or the second beam body.

[0012] With such a setting, there are more installation positions for the plate heat exchanger, and the installation position of the plate heat exchanger can be reasonably selected in combination with the pipe routing of the internal piping module.

[0013] As an alternative embodiment, the plate heat exchanger is installed on the side of the first beam body facing away from the second beam body, or the plate heat exchanger is installed on the side of the second beam body facing away from the first beam body.

[0014] With such a setting, when the distance between the first beam body and the second beam body is small, the plate heat exchanger can also be installed on the first beam body or the second beam body. On the premise that the chassis can be detached separately, the plate heat exchanger is installed at a more appropriate position.

[0015] As an alternative embodiment, the shell includes a top plate and a plurality of side plates surrounding the periphery of the top plate. The top plate is arranged opposite to the chassis, and the plurality of side plates define an opening. The support crossbeam has two connection ends arranged oppositely and respectively connected to two oppositely arranged side plates. The plate heat exchanger is arranged closer to one connection end compared to the contact position between the piping module and the support crossbeam.

[0016] With such a setting, it can, to a certain extent, avoid the influence of the change in the position of the plate heat exchanger on the pipe routing in the piping module. In this way, when the chassis can be detached separately, by limiting the installation position of the plate heat exchanger, the influence on the pipe routing of the piping module is avoided, ensuring the smooth flow of the refrigerant.

[0017] As an alternative embodiment, the housing includes a top plate and a plurality of side plates surrounding the periphery of the top plate, and the plurality of side plates define an open end; the piping assembly includes a support cross beam, and opposite ends of the support cross beam are respectively connected to two relatively arranged side plates; wherein, the plate heat exchanger is fixed to the inner wall surface of one of the side plates.

[0018] With such an arrangement, when the chassis can be detached separately, the plate heat exchanger can be installed on the side plate, which can reduce the great influence on the size of the refrigerant switching device in the height direction due to the installation of the plate heat exchanger. In this way, the structural compactness of the refrigerant switching device in the height direction is relatively strong.

[0019] As an alternative embodiment, the refrigerant switching device provided in the present application further includes an electronic control module; a first cavity and a second cavity are formed at intervals in the installation cavity, part of the structures of the plate heat exchanger and the piping assembly are accommodated in the first cavity, and the electronic control module is accommodated in the second cavity.

[0020] In this way, to a certain extent, the plate heat exchanger, the piping assembly and the electronic control module can be isolated, and the refrigerant flowing in the plate heat exchanger and the piping assembly can be prevented from affecting the electronic control module.

[0021] As an alternative embodiment, the housing includes a top plate and a plurality of side plates surrounding the periphery of the top plate, the top plate is arranged opposite to the chassis, and the plurality of side plates define a downwardly arranged open end; wherein, the plate heat exchanger is fixed to the outer wall surface of one of the side plates and is communicated with the piping assembly through a connecting pipe passing through the side plate.

[0022] In this way, the plate heat exchanger can be fixed outside the housing, and the chassis can also be detached separately.

[0023] As an alternative embodiment, a connecting bracket is further included, and the plate heat exchanger is connected to the piping assembly or the housing through the connecting bracket.

[0024] In this way, on the one hand, it is convenient to connect the plate heat exchanger to the piping assembly or the housing, and on the other hand, the service performance of the plate heat exchanger can be kept normal.

[0025] As an alternative embodiment, the connecting bracket includes a first connecting portion and a second connecting portion connected together; the first connecting portion is connected to the plate heat exchanger, and the second connecting portion is connected to the piping assembly or the housing.

[0026] In this way, through the structural limitation of the connecting bracket, the connection between the plate heat exchanger and the piping assembly or the housing can be realized.

[0027] As an alternative embodiment, the first connecting portion is detachably connected to the plate heat exchanger; and / or, the second connecting portion is detachably connected to the piping assembly or the housing.

[0028] In this way, by adopting a detachable connection method, the assembly efficiency between the plate heat exchanger and the piping assembly or the housing can be improved.

[0029] As an alternative embodiment, the second connecting portion is connected to the piping assembly. The piping assembly has a first mounting surface for connecting to the second connecting portion, and the extending direction of the second connecting portion is the same as the extending direction of the first mounting surface.

[0030] In this way, the structural compactness inside the refrigerant switching device can be improved.

[0031] As an alternative embodiment, the second connecting portion is connected to the housing. The housing has a second mounting surface for connecting to the second connecting portion, and the extending direction of the second connecting portion is the same as the extending direction of the second mounting surface.

[0032] In this way, the structural compactness inside the refrigerant switching device can be improved.

[0033] As an alternative embodiment, the connecting bracket is an integral structure.

[0034] In this way, it is convenient to process and form the connecting bracket, improving the manufacturing efficiency of the connecting bracket and the manufacturing efficiency of the refrigerant switching device at the same time.

[0035] On the other hand, the present application provides a heating and ventilation equipment including the above-mentioned refrigerant switching device.

[0036] In the refrigerant switching device and the heating and ventilation equipment provided by the embodiments of the present application, the refrigerant switching device includes a housing, a chassis, a piping assembly, and a plate heat exchanger. Among them, the chassis is detachably connected to the housing, the piping assembly is installed in the housing, and the plate heat exchanger is installed on the piping assembly or the housing. In this way, no matter whether the plate heat exchanger is installed on the piping assembly or the housing, the separate disassembly of the chassis can be ensured. When checking or repairing the piping assembly, the chassis can be directly removed, which not only makes the checking or repairing efficiency of the piping assembly relatively high, but also makes the checking or repairing cost of the piping assembly relatively low. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0038] Figure 1 It is an exploded view of the refrigerant switching device provided by the embodiment of the present application;

[0039] Figure 2Explosion diagram of the first partial structure of the refrigerant switching device provided by the embodiment of the present application;

[0040] Figure 3 Schematic plan view of the second partial structure of the refrigerant switching device provided by the embodiment of the present application;

[0041] Figure 4 For Figure 3 Enlarged schematic view of the partial structure at A in

[0042] Figure 5 For Figure 3 Cross-sectional view of

[0043] Figure 6 Schematic diagram of the first installation method of the plate heat exchanger in the refrigerant switching device provided by the embodiment of the present application;

[0044] Figure 7 Schematic diagram of the second installation method of the plate heat exchanger in the refrigerant switching device provided by the embodiment of the present application;

[0045] Figure 8 Schematic diagram of the third installation method of the plate heat exchanger in the refrigerant switching device provided by the embodiment of the present application;

[0046] Figure 9 Schematic diagram of the fourth installation method of the plate heat exchanger in the refrigerant switching device provided by the embodiment of the present application;

[0047] Figure 10 Refrigerant flow diagram when each indoor unit in the heating and ventilation equipment provided by the embodiment of the present application is in the cooling mode;

[0048] Figure 11 Refrigerant flow diagram when each indoor unit in the heating and ventilation equipment provided by the embodiment of the present application is in the heating mode;

[0049] Figure 12 Refrigerant flow diagram when the majority of the indoor units in the heating and ventilation equipment provided by the embodiment of the present application are in the cooling state;

[0050] Figure 13 Refrigerant flow diagram when the majority of the indoor units in the heating and ventilation equipment provided by the embodiment of the present application are in the heating state.

[0051] Explanation of reference numerals:

[0052] 1. Housing; 2. Chassis; 3. Pipe assembly; 4. Plate heat exchanger; 5. Installation cavity; 6. Electric control module; 7. Connecting bracket; 8. Branch unit;

[0053] 11. Top plate; 12. Side plate; 31. Support cross beam; 32. Pipeline module; 51. First cavity; 52. Second cavity; 71. First connection part; 72. Second connection part; 81. Branch liquid pipe; 82. Bypass liquid pipe; 83. First one-way valve; 84. Second one-way valve; 85. Branch air pipe; 86. Bypass air pipe; 87. Electronic expansion valve; 88. Refrigerator; 89. Pressure relief pipe;

[0054] 121. First side plate; 122. Second side plate; 311. First beam body; 312. Second beam body; 313. Connection end; 321. Liquid pipe pipeline module; 322. Air pipe pipeline module; 323. Main liquid pipe; 324. Low-pressure air pipe; 325. High-pressure air pipe; 326. First branch liquid pipe; 327. Second branch liquid pipe; 328. Third branch liquid pipe; 810. Pressure relief valve; 820. Filter; 830. Sensor;

[0055] 1211. Second installation surface; 3121. First installation surface; 313a. First connection end; 313b. Second connection end. Detailed implementation manners

[0056] The principles and features of the present application will be described below in conjunction with the accompanying drawings. The examples given are only used to explain the present application and are not intended to limit the scope of the present application.

[0057] Currently, in some medium and small-sized buildings and some public buildings, such as office buildings, the use of multi-connected central air conditioners is relatively common. A multi-connected central air conditioner refers to an outdoor unit connected to two or more indoor units through pipes. A multi-connected central air conditioner generally includes an outdoor unit, a refrigerant switching device, and multiple indoor units. The main function of the refrigerant switching device is to achieve the switching of indoor units in different modes. Among them, the outdoor unit is connected to the refrigerant switching device through a liquid pipe, a low-pressure air pipe, and a high-pressure air pipe, and each indoor unit is connected to the refrigerant switching device through a liquid pipe and an air pipe. Specifically, when the indoor unit is in the cooling mode, the refrigerant switching device connects the indoor unit liquid pipe and the outdoor unit liquid pipe, and connects the indoor unit air pipe and the outdoor unit low-pressure air pipe to achieve the cooling operation of the indoor unit; when the indoor unit is in the heating mode, the refrigerant switching device connects the indoor unit liquid pipe and the outdoor unit liquid pipe, and connects the indoor unit air pipe and the outdoor unit high-pressure air pipe to achieve the heating operation of the indoor unit.

[0058] Generally, in order to avoid the "flashing" phenomenon of the refrigerant during the flow process, a plate heat exchanger is provided in the refrigerant switching device to increase the subcooling degree. In the related art, the housing structure of the refrigerant switching device includes a top shell and a chassis. An installation cavity for accommodating the piping is formed by enclosing between the top shell and the chassis, and the plate heat exchanger is arranged on the chassis. However, in the above-mentioned refrigerant switching device, since the chassis cannot be disassembled separately, if it is necessary to repair the internal piping, etc., the entire refrigerant switching device needs to be removed before the internal piping can be repaired. In this way, not only will the inspection or repair efficiency of the piping be reduced, but also the inspection or repair cost will be increased.

[0059] Therefore, the embodiments of the present application provide a refrigerant switching device and a heating, ventilation, and air conditioning (HVAC) equipment. By improving the installation position of the plate heat exchanger, the problems of low efficiency and high cost in inspecting or repairing the internal piping of the refrigerant switching device in the related art are solved.

[0060] It should be noted that the above-mentioned "flashing" phenomenon means the phenomenon that a part of the liquid refrigerant vaporizes when the pressure suddenly drops, generating gas.

[0061] In addition, the refrigerant switching device provided in this embodiment can be installed in the ceiling like an indoor unit, or can be arranged in an independent electrical control space. Here, the installation environment of the refrigerant switching device is not specifically limited.

[0062] The following will introduce the embodiments of the present application in detail in conjunction with the drawings and specific implementation manners.

[0063] Please refer to Figure 1 and Figure 2 , Figure 1 which is the exploded view of the refrigerant switching device provided by the embodiment of the present application, Figure 2 and which is the exploded view of the first partial structure of the refrigerant switching device provided by the embodiment of the present application. As shown in the figure, the present embodiment provides a refrigerant switching device, including a housing 1 and a chassis 2. Among them, the housing 1 has a cover structure and includes a top plate 11 and a plurality of side plates 12 surrounding the periphery of the top plate 11. The top plate 11 is disposed opposite to the chassis 2. The plurality of side plates 12 define an open end facing downward. The chassis 2 is covered at the open end and is detachably connected to the housing 1. The chassis 2 and the housing 1 enclose an installation cavity 5.

[0064] Regarding the detachable connection between the chassis 2 and the housing 1, it can be the connection between the chassis 2 and the plurality of side plates 12. Specifically, protruding connection ears or other structures can be provided on the chassis 2, and the structure can be detachably connected to the chassis 2 through threaded structures such as screws to achieve the detachable connection between the chassis 2 and the housing 1.

[0065] Specifically, it is defined that the refrigerant switching device has a length direction and a width direction. The plurality of side plates 12 may include two first side plates 121 oppositely arranged along the length direction and two second side plates 122 oppositely arranged along the width direction. The two second side plates 122 are connected between the ends of the two first side plates 121 to enclose the above-mentioned opening with the two first side plates 121.

[0066] Among them, the length direction is consistent with Figure 1 and Figure 2 the x-x axis direction in Figure 1 and Figure 2 the y-y axis direction in.

[0067] In order to achieve the connection between the outdoor unit and the indoor unit and transfer the refrigerant, the refrigerant switching device provided in this embodiment should further include a pipe assembly 3. The pipe assembly 3 is used to connect the outdoor unit and the indoor unit and is installed on the housing 1. For example, it can be installed between the two first side plates 121 or between the two second side plates 122. The connection manner between the pipe assembly 3 and the first side plate 121 or the second side plate 122 can be a detachable connection, specifically, it can be connected by screw fasteners such as screws. In the following embodiments, the connection between the pipe assembly 3 and the housing 1 will be further introduced.

[0068] As can be seen from the above, a part of the liquid refrigerant will vaporize and generate gas when the pressure suddenly drops, that is, the "flashing" phenomenon. In order to avoid this phenomenon of the refrigerant, a plate heat exchanger 4 is usually provided in the refrigerant switching device. The plate heat exchanger 4 is connected to the pipe assembly 3 and is used to increase the subcooling degree of the refrigerant flowing through the pipe assembly 3. In this way, the "flashing" phenomenon of the refrigerant can be avoided, thereby improving the refrigeration effect of the indoor unit.

[0069] In the related art, since the plate heat exchanger 4 is installed on the chassis 2, at this time, if it is necessary to check or repair the pipe assembly 3, the chassis 2 cannot be disassembled alone, and the entire refrigerant switching device needs to be disassembled before the internal pipe assembly 3 can be checked or repaired. On the one hand, the efficiency will be reduced, and on the other hand, the cost will be increased.

[0070] Therefore, in this embodiment, the installation position of the plate heat exchanger 4 is improved. Thus, in this embodiment, the plate heat exchanger 4 can be installed on the piping assembly 3 or the housing 1. In this way, on the basis that the piping assembly 3 is installed on the housing 1, whether the plate heat exchanger 4 is installed on the piping assembly 3 or on the housing 1, the separate disassembly of the chassis 2 can be ensured. When checking or overhauling the piping assembly 3, the chassis 2 can be directly removed, which not only makes the checking or overhauling efficiency of the piping assembly 3 relatively high, but also makes the checking or overhauling cost of the piping assembly 3 relatively low.

[0071] It can be understood that when the plate heat exchanger 4 is installed on the piping assembly 3, some structures of the plate heat exchanger 4 and the piping assembly 3 are both located in the installation cavity 5; when the plate heat exchanger 4 is installed on the housing 1, the plate heat exchanger 4 can be located in the installation cavity 5 or outside the housing 1. The following will introduce these three methods in detail.

[0072] Please refer to Figures 3 to 5 , Figure 3 which is a schematic plan view of the second partial structure of the refrigerant switching device provided in the embodiment of the present application. Figure 4 is Figure 3 a schematic enlarged view of the partial structure at A in Figure 5 and is Figure 3 a cross-sectional view of . As shown in the figure, in an alternative embodiment, the plate heat exchanger 4 is installed on the piping assembly 3.

[0073] Specifically, the piping assembly 3 includes a support cross beam 31 and a pipeline module 32. The support cross beam 31 is connected to the housing 1 and is used to carry the pipeline module 32. Specifically, the opposite ends of the support cross beam 31 are respectively connected to two first side plates 121; the pipeline module 32 is used to connect the outdoor unit and the indoor unit. The plate heat exchanger 4 is connected to the pipeline module 32 and fixed on the support cross beam 31. Specifically, the plate heat exchanger 4 is connected to the pipeline module 32 through an inlet pipe adapter and an outlet pipe adapter.

[0074] It can be understood that the pipeline module 32 includes a liquid pipe pipeline module 321 and a gas pipe pipeline module 322. When multiple indoor units are in multiple states, the plate heat exchanger 4 is connected to the liquid pipe pipeline module 321 through an inlet pipe adapter, and the plate heat exchanger 4 is connected to the liquid pipe pipeline module 321 and / or the gas pipe pipeline module 322 through an outlet pipe adapter. The detailed introduction of this part will be reflected in the following introduction of the refrigerant flow direction of the indoor unit in different modes.

[0075] In order to carry the liquid pipe line module 321 and the gas pipe line module 322 respectively, in some specific embodiments, the support cross beam 31 includes a first beam body 311 and a second beam body 312 that are spaced apart along the width direction of the refrigerant switching device; the first beam body 311 is used to carry the liquid pipe line module 321, and the second beam body 312 is used to carry the gas pipe line module 322; wherein, the plate heat exchanger 4 is installed on any one of the first beam body 311 and the second beam body 312. In this way, the plate heat exchanger 4 can be installed on the piping assembly 3, making the plate heat exchanger 4 and the piping assembly 3 integrally modularized, which is convenient for installing the plate heat exchanger 4 and the piping assembly 3 as a whole on the housing 1.

[0076] Specifically, when installing the piping assembly 3, the plate heat exchanger 4 and the housing 1:

[0077] When the plate heat exchanger 4 is installed on the first beam body 311, first install the liquid pipe line module 321 on the first beam body 311, then install the plate heat exchanger 4 on the first beam body 311. After the assembly is completed, install the gas pipe line module 322 on the second beam body 312. After the assembly is completed, place this part on the structure composed of the already installed liquid pipe line module 321, the plate heat exchanger 4 and the first beam body 311. After the placement is completed, install them together on the housing 1;

[0078] When the plate heat exchanger 4 is installed on the second beam body 312, first install the liquid pipe line module 321 on the first beam body 311. After the assembly is completed, install the gas pipe line module 322 on the second beam body 312 and install the plate heat exchanger 4 on the second beam body 312. After the assembly is completed, place this part on the structure composed of the already installed liquid pipe line module 321 and the first beam body 311. After the placement is completed, install them together on the housing 1.

[0079] It can be understood that in order to improve the structural compactness inside the refrigerant replacement device, the distance between the first beam body 311 and the second beam body 312 is generally set to be small. Therefore, it is difficult to arrange the plate heat exchanger 4 between the first beam body 311 and the second beam body 312. Thus, please combine Figure 6 and Figure 7 , Figure 6 FIG. Figure 7 is a schematic diagram of the first installation method of the plate heat exchanger in the refrigerant switching device provided by the embodiment of the present application, Figure 6 FIG. Figure 7As shown, in some other alternative embodiments, the plate heat exchanger 4 is installed on the side of the second beam body 312 away from the first beam body 311. In this way, it will neither affect the structure of the piping assembly 3 between the first beam body 311 and the second beam body 312, and moreover, the chassis 2 can be disassembled separately to facilitate the inspection or maintenance of the piping assembly 3.

[0080] It should be noted that since the plate heat exchanger 4 will be installed on the first beam body 311 or the second beam body 312, therefore, in order to form an installation space for accommodating the plate heat exchanger 4, when the plate heat exchanger 4 is installed on the first beam body 311, the extension length of the first beam body 311 should be greater than the extension length of the second beam body 312; when the plate heat exchanger 4 is installed on the second beam body 312, the extension length of the second beam body 312 should be greater than the extension length of the first beam body 311.

[0081] It can be understood that if the plate heat exchanger 4 is installed in the middle of the first beam body 311 or the second beam body 312 in the length direction of the refrigerant switching device, it will not only affect the routing of the pipeline module 32, but also make the connection pipes between the plate heat exchanger and the pipeline module 32 more cumbersome. Therefore, in this embodiment, the support cross beam 31 has two connection ends 313 arranged oppositely and respectively connected to two oppositely arranged first side plates 121, and the plate heat exchanger 4 is arranged closer to one connection end 313 than the contact point between the pipeline module 32 and the support cross beam 31. In this way, the plate heat exchanger 4 is located on one side of the refrigerant switching device along the length direction compared with the pipeline module 32, which can not only avoid affecting the routing of the pipeline module 32, but also ensure the smoothness of the pipe routing of the plate heat exchanger 4 itself.

[0082] Specifically, the first beam body 311 has two oppositely arranged first connection ends 313a, and the second beam body 312 has two oppositely arranged second connection ends 313b. When the plate heat exchanger 4 is installed on the first beam body 311, the plate heat exchanger 4 is arranged closer to one first connection end 313a than the contact point between the pipeline module 32 and the support cross beam 31; when the plate heat exchanger 4 is installed on the second beam body 312, the plate heat exchanger 4 is arranged closer to one second connection end 313b than the contact point between the pipeline module 32 and the support cross beam 31.

[0083] Please combine Figure 8 , Figure 8This is a schematic diagram of the third installation method of the plate heat exchanger in the refrigerant switching device provided by the embodiment of the present application. In another alternative embodiment, when the plate heat exchanger 4 is located in the installation cavity 5, the plate heat exchanger 4 can also be installed on the housing 1. Specifically, the plate heat exchanger 4 can be fixed to the inner wall surface of one side plate 12. In the specific implementation of this embodiment, the plate heat exchanger 4 can be fixed to the inner wall surface of the first side plate 121. With such a setting, it is also possible to separately disassemble the chassis 2 to view or repair the pipeline module 32. In addition, when the plate heat exchanger 4 is installed on the first side plate 121, in the height direction, the occupied size of the plate heat exchanger 4 and the occupied size of the piping assembly 3 can have a certain degree of overlap, so that the refrigerant switching device can have a higher structural compactness in the height direction of the refrigerant switching device.

[0084] Wherein, the height direction of the refrigerant switching device is the same as Figure 1 and Figure 2 the z-z axis direction in

[0085] It can be understood that, in order to realize the opening or closing of the electronic expansion valve in the refrigerant switching device, the refrigerant switching device provided by this embodiment should also include an electronic control module 6. The installation cavity 5 is formed with a first cavity 51 and a second cavity 52 arranged at intervals. When the plate heat exchanger 4 is located in the housing 1, part of the structures of the plate heat exchanger 4 and the piping assembly 3 are accommodated in the first cavity 51, and the electronic control module 6 is accommodated in the second cavity 52, and the first cavity 51 and the second cavity 52 are distributed along the width direction of the refrigerant switching device. In this way, there is a certain distance between the plate heat exchanger 4 and the piping assembly 3 and the electronic control module 6, which can, to a certain extent, prevent the refrigerant flowing in the plate heat exchanger 4 and the pipeline module 32 from leaking onto the electronic control module 6 and ensure the normal use performance of the electronic control module 6.

[0086] Wherein, the electronic control module 6 is of a modular design, that is, the electronic control module 6 can be installed or disassembled separately compared with the housing 1 and / or the chassis 2 as a whole. That is to say, the electronic control module 6 can be composed of a mounting part, a circuit board, and electrical components, etc. The mounting part is installed between the housing 1 and the chassis 2, and a cavity for accommodating the circuit board and electrical components is formed by the mounting part, the housing 1, and the chassis 2 together.

[0087] It should be noted that a partition can also be provided on the chassis 2 or the housing 1 to separate the first cavity 51 and the second cavity 52 by the partition. At this time, the electronic control module can only include a circuit board and electrical components, etc. Here, the specific implementation form of the electronic control module 6 is not limited.

[0088] Please refer to Figure 9 , Figure 9This is a schematic diagram of the fourth installation method of the plate heat exchanger in the refrigerant switching device provided by the embodiment of the present application. As Figure 9 shown, of course, the plate heat exchanger 4 can also be installed outside the housing 1. At this time, the plate heat exchanger 4 is fixed on the outer wall surface of one side plate 12, for example, the outer wall surface of the first side plate 121, and the plate heat exchanger 4 is communicated with the piping assembly 3 through a connecting pipe passing through the side plate 12. That is to say, the plate heat exchanger 4 is located outside the first cavity 51 and is installed on a first side plate 121. At this time, the inlet pipe connecting pipe and the outlet pipe connecting pipe connected to the plate heat exchanger 4 pass through the first side plate 121 and are communicated with the pipeline module 32. In this way, the plate heat exchanger 4 can be installed outside the housing 1 so that the chassis 2 can be independently disassembled.

[0089] It should be noted that when the plate heat exchanger 4 is installed outside the housing 1, the positions of the inlet pipe connecting pipe and the outlet pipe connecting pipe connected to the plate heat exchanger 4 are closer to a first connection end 313a than the contact position between the pipeline module 32 and the support cross beam 31. In this way, the routing of the pipeline module 32 can be avoided to a certain extent.

[0090] Whether the plate heat exchanger 4 is installed on the piping assembly 3 or on the housing 1, directly fixing the plate heat exchanger 4 on the piping assembly 3 or the housing 1 not only has a large cost, but also may affect the performance of the plate heat exchanger 4. Therefore, in this embodiment, in order to install the plate heat exchanger 4, an intermediate connection bracket 7 needs to be provided, and the plate heat exchanger 4 is connected to the piping assembly 3 or the housing 1 through the connection bracket 7. In this way, on the one hand, the plate heat exchanger 4 can be installed on the piping assembly 3 or the housing 1, on the other hand, the installation cost of the plate heat exchanger 4 is small, and the service performance of the plate heat exchanger 4 is good.

[0091] Specifically, the connection bracket 7 may include a first connection portion 71 and a second connection portion 72 connected together; the first connection portion 71 is connected to the plate heat exchanger 4, and the second connection portion 72 is connected to the piping assembly 3 or the housing 1. In this way, by providing the connection bracket 7 including the first connection portion 71 and the second connection portion 72, the plate heat exchanger 4 can be installed on the housing 1 or the piping assembly 3 through the connection bracket 7.

[0092] Among them, in order to facilitate the assembly of the connection bracket 7, in some alternative embodiments, the first connection portion 71 is detachably connected to the plate heat exchanger 4, and the second connection portion 72 is detachably connected to the piping assembly 3 or the housing 1. In this way, it is convenient to connect the connection bracket 7 to the plate heat exchanger 4, and it is also convenient to connect the connection bracket 7 to the piping assembly 3 or the housing 1.

[0093] It should be noted that the first connecting portion 71 and the plate heat exchanger 4 can be connected by threaded fasteners such as screws, and the second connecting portion 72 and the piping assembly 3 or the housing 1 can also be connected by threaded fasteners such as screws.

[0094] In order to further improve the compactness of the internal structure of the refrigerant switching device provided in this embodiment, in some embodiments, the shape of the second connecting portion 72 can be restricted to a certain extent.

[0095] Specifically, when the plate heat exchanger 4 is installed on the piping assembly 3, the second connecting portion 72 is connected to the piping assembly 3, that is, the second connecting portion 72 is connected to the first beam body 311 or the second beam body 312. Refer to Figure 7 , when the second connecting portion 72 is connected to the second beam body 312, the second beam body 312 has a first mounting surface 3121 for connecting with the second connecting portion 72, and the extending direction of the second connecting portion 72 is the same as the extending direction of the first mounting surface 3121.

[0096] Among them, the first mounting surface 3121 can be the top surface of the second beam body 312, and the top surface of the second beam body 312 extends in the horizontal direction. At this time, if the extending direction of the second connecting portion 72 is the same as the extending direction of the first mounting surface 3121, the structural compactness of the refrigerant switching device in its height direction is stronger.

[0097] Furthermore, when the plate heat exchanger 4 is installed on the housing 1, the second connecting portion 72 is connected to the housing 1, that is, the second connecting portion 72 is connected to the first side plate 121. At this time, the inner plate surface or the outer plate surface of the first side plate 121 forms a second mounting surface 1211 for connecting with the second connecting portion 72, and the extending direction of the second connecting portion 72 is the same as the extending direction of the second mounting surface 1211. Among them, the extending direction of the plate surface of the first side plate 121 is the same as the vertical direction. In this way, the structural compactness of the refrigerant switching device provided in this embodiment in its length direction is stronger.

[0098] In order to facilitate the machining and manufacturing of the connection bracket 7, the connection bracket 7 is an integral structure. In this way, the manufacturing efficiency of the connection bracket 7 is relatively high, and thus the manufacturing and assembly efficiency of the refrigerant switching device provided in this embodiment is relatively high.

[0099] This embodiment also provides a heating and ventilation equipment, including the refrigerant switching device in the above embodiment. Among them, the structure of the refrigerant switching device has been introduced in detail in the above embodiment and will not be elaborated here.

[0100] In addition, the heating and ventilation equipment provided in this embodiment should also include an outdoor unit and multiple indoor units. Taking four indoor units as an example, the refrigerant flow conditions of the heating and ventilation equipment provided in this embodiment in different modes will be introduced in detail below.

[0101] Please refer to Figures 10 to 13 and Figure 10 which are the refrigerant flow diagrams of each indoor unit in the HVAC equipment provided by the embodiments of this application in the cooling mode, Figure 11 and Figure 12 which are the refrigerant flow diagrams of most of the indoor units in the HVAC equipment provided by the embodiments of this application in the cooling state, Figure 13 and Figure 10 which are the refrigerant flow diagrams of most of the indoor units in the HVAC equipment provided by the embodiments of this application in the heating state. For the convenience of description, the operation mode of the indoor unit shown in Figure 11 is called the full cooling mode, the operation mode of the indoor unit shown in Figure 12 is called the main cooling mode, the operation mode of the indoor unit shown in Figure 13 is called the full heating mode, and the operation mode of the indoor unit shown in

[0102] Before introducing the refrigerant flow in each mode, the pipelines in the pipeline module 32 will be introduced first. Specifically, the pipeline module 32 has a main liquid pipe 323, a low-pressure gas pipe 324, and a high-pressure gas pipe 325 that are connected to the outdoor unit. A first branch liquid pipe 326 is connected to the main liquid pipe 323, and a plate heat exchanger 4 is connected through an inlet pipe. The plate heat exchanger 4 is connected to the second branch liquid pipe 327 through an outlet pipe and an inlet pipe, and the plate heat exchanger 4 is connected to the third branch liquid pipe 328 through an outlet pipe. For the four indoor units, each indoor unit corresponds to a branch unit 8. The branch unit 8 includes a branch liquid pipe 81 that connects the first branch liquid pipe 326 and the liquid pipe of the indoor unit. The branch liquid pipe 81 is connected to the second branch liquid pipe 327 through a bypass liquid pipe 82. A first one-way valve 83 is provided between the joint of the branch liquid pipe 81 and the first branch liquid pipe 326 and the joint of the bypass liquid pipe 82. A second one-way valve 84 is provided on the bypass liquid pipe 82. The high-pressure gas pipe 325 is connected to the gas pipe of the indoor unit through a branch gas pipe 85, and the branch gas pipe 85 is connected to the low-pressure gas pipe 324 through a bypass gas pipe 86.

[0103] It should be noted that the above liquid pipe pipeline module 321 includes the main liquid pipe 323, the first branch liquid pipe 326, the second branch liquid pipe 327, the third branch liquid pipe 328, the branch liquid pipe 81, and the bypass liquid pipe 82, and the above gas pipe pipeline module 322 includes the low-pressure gas pipe 324, the high-pressure gas pipe 325, the branch gas pipe 85, and the bypass gas pipe 86.

[0104] Among them, electronic expansion valves 87 are provided on the branch liquid pipe 81, the branch gas pipe 85, and the bypass gas pipe 86 to adjust the flow rate of the refrigerant; of course, in order to filter the refrigerant, filters 820 can be provided on the branch liquid pipe 81, the branch gas pipe 85, and the bypass gas pipe 86.

[0105] Further, a cooler 88 is provided between the second branch liquid pipe 327 and the plate heat exchanger 4. By providing the cooler 88, the refrigerant flowing in the second branch liquid pipe 327 is cooled to the refrigerant flowing in the third branch liquid pipe 328.

[0106] In addition, a pressure relief pipe 89 is also connected between the branch liquid pipe 81 and the low-pressure gas pipe 324. A pressure relief valve 810 is provided on the pressure relief pipe 89. When the pressure in the indoor unit is relatively high, the pressure relief valve 810 opens.

[0107] In order to avoid refrigerant leakage, a sensor 830 for detecting refrigerant can also be provided in the refrigerant switching device provided in this embodiment. When the sensor 830 detects refrigerant leakage, the ventilation system can be started. Here, the ventilation system is not limited.

[0108] As Figure 10 shown, in the full cooling mode, for each indoor unit, the first one-way valve 83 in its corresponding branch unit 8 is closed and the second one-way valve 84 is opened. The flow direction of the refrigerant is always outdoor unit → main liquid pipe 323 → plate heat exchanger 4 → second branch liquid pipe 327 → bypass liquid pipe 82 → branch liquid pipe 81 → indoor unit liquid pipe → indoor unit → indoor unit gas pipe → branch gas pipe 85 → bypass gas pipe 86 → low-pressure gas pipe 324 → outdoor unit. In this way, a refrigeration cycle is completed;

[0109] As Figure 11 shown, in the full heating mode, for each indoor unit, the first one-way valve 83 in its corresponding branch unit 8 is opened and the second one-way valve 84 is closed. The flow direction of the refrigerant is always outdoor unit → high-pressure gas pipe 325 → branch gas pipe 85 → indoor unit gas pipe → indoor unit → indoor unit liquid pipe → branch liquid pipe 81 → first branch liquid pipe 326 → main liquid pipe 323 → outdoor unit. In this way, a heating cycle is completed;

[0110] As Figure 12 shown, in the main cooling mode, for the indoor unit in the heating mode, the first one-way valve 83 in its corresponding branch unit 8 is opened and the second one-way valve 84 is closed. The flow direction of the refrigerant is outdoor unit → high-pressure gas pipe 325 → branch gas pipe 85 → indoor unit gas pipe → indoor unit → indoor unit liquid pipe → branch liquid pipe 81 → first branch liquid pipe 326 → main liquid pipe 323 → outdoor unit. In this way, a heating cycle is completed;

[0111] For the indoor unit in the cooling mode, the first one-way valve 83 in the corresponding branch pipe unit 8 is closed, and the second one-way valve 84 is open. The flow direction of the refrigerant is always: outdoor unit → main liquid pipe 323 → plate heat exchanger 4 → second branch liquid pipe 327 → bypass liquid pipe 82 → branch liquid pipe 81 → indoor unit liquid pipe → indoor unit → indoor unit gas pipe → branch gas pipe 85 → bypass gas pipe 86 → low-pressure gas pipe 324 → outdoor unit. After the refrigerant flows out of the plate heat exchanger 4, a part of it will be diverted along the cooler 88 → third branch liquid pipe 328 → low-pressure gas pipe 324 → outdoor unit. In this way, a cooling cycle is completed;

[0112] As Figure 13 shown, in the main heating mode, for the indoor unit in the heating mode, the first one-way valve 83 in the corresponding branch pipe unit 8 is open, and the second one-way valve 84 is closed. The flow direction of the refrigerant is: outdoor unit → high-pressure gas pipe 325 → branch gas pipe 85 → indoor unit gas pipe → indoor unit → indoor unit liquid pipe → branch liquid pipe 81 → first branch liquid pipe 326 → main liquid pipe 323 → outdoor unit. In this way, a heating cycle is completed;

[0113] For the indoor unit in the cooling mode, during the operation of the indoor unit in the heating mode, when the refrigerant flows to the main liquid pipe 323, a part of it will be diverted to the plate heat exchanger 4, and the flow direction of the refrigerant is: plate heat exchanger 4 → second branch liquid pipe 327 → bypass liquid pipe 82 → branch liquid pipe 81 → indoor unit liquid pipe → indoor unit → indoor unit gas pipe → branch gas pipe 85 → bypass gas pipe 86 → low-pressure gas pipe 324 → outdoor unit. After the refrigerant flows out of the plate heat exchanger 4, a part of it will be diverted along the cooler 88 → third branch liquid pipe 328 → low-pressure gas pipe 324 → outdoor unit. In this way, a cooling cycle is completed.

[0114] 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 in the cooling mode and one indoor unit can be in the heating mode; in the main heating mode, three indoor units can be in the heating mode and one indoor unit can be in the cooling mode. Here, the number of indoor units and the actual cooling mode are not specifically limited.

[0115] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application.

[0116] In addition, 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 quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0117] In the present application, unless otherwise clearly defined and limited, terms such as "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0118] In the present application, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0119] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0120] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A refrigerant switching device, characterized in that, Comprising: A housing; A chassis, disposed at the bottom of the housing and detachably connected to the housing; A piping assembly for connecting an outdoor unit and an indoor unit and installed in the housing; And A plate heat exchanger, connected to the piping assembly and installed on the piping assembly or the housing, and the plate heat exchanger is used to increase the subcooling degree of the refrigerant flowing through the piping assembly.

2. The refrigerant switching device according to claim 1, wherein The housing has a cover structure and forms an open end facing downward, and the chassis covers the open end to enclose an installation cavity with the housing; Part of the structures of the plate heat exchanger and the piping assembly are disposed in the installation cavity.

3. The refrigerant switching device according to claim 2, wherein The piping assembly includes a support cross beam and a piping module, the support cross beam is connected to the housing and is used to carry the piping module; The piping module is used to connect the outdoor unit and the indoor unit, and the plate heat exchanger is connected to the piping module and fixed on the support cross beam.

4. The refrigerant switching device according to claim 3, characterized in that The support cross beam includes a first beam body and a second beam body that are spaced apart; The piping module includes a liquid pipe piping module and a gas pipe piping module, the first beam body is used to carry the liquid pipe piping module, and the second beam body is used to carry the gas pipe piping module; Wherein, the plate heat exchanger is installed on any one of the first beam body and the second beam body.

5. The refrigerant switching device according to claim 4, wherein The plate heat exchanger is installed on a side of the first beam body facing away from the second beam body, or the plate heat exchanger is installed on a side of the second beam body facing away from the first beam body.

6. The refrigerant switching device according to claim 3, wherein The housing includes a top plate and a plurality of side plates surrounding the periphery of the top plate, the top plate is disposed opposite to the chassis, and the plurality of side plates define the open end; The support cross beam has two connection ends that are oppositely disposed and respectively connected to two oppositely disposed side plates, and the plate heat exchanger is disposed closer to one of the connection ends compared to the contact portion of the piping module with the support cross beam.

7. The refrigerant switching device according to claim 2, wherein The housing includes a top plate and a plurality of side plates surrounding the periphery of the top plate, and the plurality of side plates define the open end; The piping assembly includes a support cross beam, and opposite ends of the support cross beam are respectively connected to two oppositely disposed side plates; Wherein, the plate heat exchanger is fixed to the inner wall surface of one of the side plates.

8. The refrigerant switching device according to claim 2, characterized in that It further includes an electric control module; A first cavity and a second cavity are formed at intervals in the installation cavity, part of the structures of the plate heat exchanger and the piping assembly are accommodated in the first cavity, and the electric control module is accommodated in the second cavity.

9. The refrigerant switching device according to claim 1, characterized in that, The housing includes a top plate and a plurality of side plates surrounding the periphery of the top plate, the top plate is disposed opposite to the chassis, and the plurality of side plates define an open end facing downward; Wherein, the plate heat exchanger is fixed on the outer wall surface of one of the side plates and is connected to the piping assembly through a connecting pipe passing through the side plate.

10. The refrigerant switching device according to claim 1, characterized in that, It further includes a connecting bracket, and the plate heat exchanger is connected to the piping assembly or the housing through the connecting bracket.

11. The refrigerant switching device according to claim 10, wherein The connecting bracket includes a first connecting portion and a second connecting portion connected together; The first connecting portion is connected to the plate heat exchanger, and the second connecting portion is connected to the piping assembly or the housing.

12. The refrigerant switching device according to claim 11, wherein The first connecting portion is detachably connected to the plate heat exchanger; and / or, The second connecting portion is detachably connected to the piping assembly or the housing.

13. The refrigerant switching device according to claim 11, characterized in that, The second connecting portion is connected to the piping assembly, the piping assembly has a first mounting surface for connecting with the second connecting portion, and the extending direction of the second connecting portion is the same as that of the first mounting surface.

14. The refrigerant switching device according to claim 11, wherein The second connecting portion is connected to the housing, the housing has a second mounting surface for connecting with the second connecting portion, and the extending direction of the second connecting portion is the same as that of the second mounting surface.

15. The refrigerant switching device according to any one of claims 11 to 14, characterized in that, The connecting bracket is of an integral structure.

16. A heating, ventilation and air conditioning (HVAC) device, characterized in that, It includes the refrigerant switching device according to any one of claims 1 to 15.

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