Variable frequency converter cabinet and cold water air conditioning unit

Abstract

The utility model discloses a kind of frequency converter cabinet and cold water air conditioning unit, and frequency converter cabinet cabinet body includes first installation cavity, second installation cavity, third installation cavity and fourth installation cavity being arranged along the transverse side-by-side of cabinet body;Circuit breaker is arranged in the upper region of first installation cavity;Direct-current reactor is arranged in first installation cavity, below circuit breaker;Rectifier bridge module is arranged in second installation cavity;Electrolytic capacitor module is arranged in third installation cavity;IGBT module, main control module are arranged in fourth installation cavity;The shell of cabinet body on the first installation cavity corresponding is equipped with incoming line part, and the shell of cabinet body on the fourth installation cavity corresponding is equipped with outgoing line part;Rectifier bridge radiator, IGBT radiator are equipped on the shell of cabinet body.The utility model frequency converter cabinet electrical arrangement is reasonable, space is fully utilized, structure is more compact, it is favorable to reduce volume and weight, more favorable in cold water air conditioning unit on airborne type fixed installation, and cost is low, and heat dissipation effect is good.

Description

Technical Field

[0001] This utility model relates to the field of air conditioner technology, and in particular to a frequency converter cabinet for a chilled water air conditioning unit and a chilled water air conditioning unit. Background Technology

[0002] With the development of industrial technology, frequency converters are widely used in fields such as motors and compressors that require frequency conversion regulation and control.

[0003] For chilled water air conditioning units in central air conditioning systems, the inverter is usually a cabinet-type structure and is fixedly installed on the heat exchanger assembly of the chilled water air conditioning unit.

[0004] In related technologies, the inverter cabinet of chilled water air conditioning unit is usually purchased externally. On the one hand, the cost is high, and on the other hand, the size of the inverter cabinet and the layout of the internal electrical components are fixed, making it difficult to adapt well to the installation space on the chilled water air conditioning unit, and it is difficult to meet the current design requirements for the compact and miniaturized structure of the inverter cabinet. At the same time, the heat dissipation structure of the inverter cabinet is simple and the heat dissipation effect is limited.

[0005] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Summary of the Invention

[0006] In response to the problems pointed out in the background art, this utility model proposes a frequency converter cabinet and a chilled water air conditioning unit. The frequency converter cabinet has a reasonable layout of electrical components, a compact structure, good heat dissipation, and low cost.

[0007] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: In some embodiments of this application, a frequency converter cabinet is provided, including: The cabinet has an internal space comprising a first mounting cavity, a second mounting cavity, a third mounting cavity, and a fourth mounting cavity arranged side by side along the horizontal direction of the cabinet. A circuit breaker is located in the upper region of the first mounting cavity; A DC reactor is disposed in the first mounting cavity and located on the bottom plate of the cabinet shell corresponding to the first mounting cavity, and the DC reactor is located below the circuit breaker; The rectifier bridge module is located inside the second mounting cavity; An electrolytic capacitor module is disposed within the third mounting cavity; The IGBT module is located within the fourth mounting cavity; The main control module is located inside the fourth mounting cavity; The cabinet housing corresponding to the first mounting cavity is provided with an inlet section, and the cabinet housing corresponding to the fourth mounting cavity is provided with an outlet section; The cabinet housing corresponding to the second mounting cavity is equipped with a rectifier bridge heat sink, and the cabinet housing corresponding to the fourth mounting cavity is equipped with an IGBT heat sink.

[0008] The inverter cabinet in the above technical solution has the following advantages or beneficial effects: By dividing the internal space of the cabinet into a first mounting cavity, a second mounting cavity, a third mounting cavity, and a fourth mounting cavity along the horizontal direction of the cabinet, and taking into account the size, function, and current flow of the main electrical components of the inverter cabinet (circuit breaker, DC reactor, rectifier bridge module, electrolytic capacitor module, IGBT module, and main control module), they are installed in appropriate positions in the above four mounting cavities for reasonable arrangement, making full use of the internal space of the cabinet, making the inverter cabinet structure more compact, which is conducive to reducing the overall size and weight of the inverter cabinet, and thus facilitating air-mounted fixed installation on chiller air conditioning units; compared with purchased inverter cabinets, the inverter cabinet in the above technical solution has a lower cost; for high-power heat-generating devices such as rectifier bridge modules and IGBT modules, corresponding rectifier bridge heat sinks and IGBT heat sinks are provided to ensure good heat dissipation effect.

[0009] In some embodiments of this application, the inverter cabinet further includes: A DC contactor is connected between the DC reactor and the electrolytic capacitor module, and the DC contactor is located in the lower region of the second mounting cavity.

[0010] The inverter cabinet in the above technical solution has the following advantages or beneficial effects: connecting a DC contactor between the DC reactor and the electrolytic capacitor module can control and protect the circuit, reduce the bus current, and ensure the reliable operation of the electrolytic capacitor module.

[0011] In some embodiments of this application, the IGBT module and the main control module are arranged longitudinally and longitudinally of the cabinet, with the IGBT module close to the cabinet housing back plate corresponding to the fourth mounting cavity, and the main control module located in front of the IGBT module.

[0012] The inverter cabinet in the above technical solution has the following advantages or beneficial effects: it can make full use of the longitudinal space of the fourth mounting cavity, further improving the structural compactness.

[0013] In some embodiments of this application, the main control module includes a first main control module and a second main control module arranged longitudinally and longitudinally along the cabinet. The first main control module is located in front of the second main control module. One side of the first main control module is hinged to the cabinet shell corresponding to the fourth mounting cavity to realize the flip-out setting of the first main control module.

[0014] The inverter cabinet in the above technical solution has the following advantages or beneficial effects: by setting the main control module separately, that is, including the first main control module and the second main control module, the longitudinal space of the fourth mounting cavity is fully utilized on the one hand, and the arrangement of various electrical components on the main control module is convenient on the other hand, which facilitates fixing and wiring.

[0015] In some embodiments of this application, the rectifier bridge module is located in the upper region of the second mounting cavity and close to the cabinet housing back plate corresponding to the second mounting cavity, and the rectifier bridge heat sink is detachably disposed on the outer surface of the cabinet housing back plate corresponding to the second mounting cavity.

[0016] The inverter cabinet in the above technical solution has the following advantages or beneficial effects: the rectifier bridge heat sink is detachable, making it convenient to disassemble and replace.

[0017] In some embodiments of this application, the IGBT heat sink is detachably mounted on the outer surface of the cabinet housing back plate corresponding to the fourth mounting cavity.

[0018] The inverter cabinet in the above technical solution has the following advantages or beneficial effects: the IGBT heat sink is detachable, making it convenient to disassemble and replace.

[0019] In some embodiments of this application, a rectifier bridge heat dissipation passage is formed on the back plate of the cabinet corresponding to the second mounting cavity; The rectifier bridge radiator includes a radiator body and an air duct cover. The radiator body is attached to and fixed on the outer surface of the cabinet shell back panel corresponding to the second mounting cavity, and covers the rectifier bridge heat dissipation through part. The air duct cover is attached to and fixed on the outer surface of the cabinet shell back panel corresponding to the second mounting cavity, and surrounds the outside of the radiator body. The air duct cover has a fan mounting port and an air outlet, and a cooling fan is installed in the fan mounting port.

[0020] The inverter cabinet in the above technical solution has the following advantages or beneficial effects: by adopting the above rectifier bridge heat sink structure, the external cooling fan and the heat sink body can be combined to enhance the heat dissipation of the rectifier bridge module and improve the heat dissipation effect.

[0021] In some embodiments of this application, a partition is provided inside the first mounting cavity to divide the first mounting cavity into a first upper mounting cavity and a first lower mounting cavity. The circuit breaker is located in the first upper mounting cavity, and the DC reactor is located in the first lower mounting cavity. A first fan is provided on the cabinet shell side panel corresponding to the first lower mounting cavity. A second fan is provided on one side of the electrolytic capacitor module, the second fan being close to the side where the second mounting cavity is located and facing the first upper mounting cavity. A third fan is provided on the cabinet shell side panel corresponding to the first upper mounting cavity. The first fan is configured to blow outside air into the cabinet through the first lower mounting cavity, and the second fan and the third fan are configured to blow air out of the cabinet through the first upper mounting cavity.

[0022] The inverter cabinet in the above technical solution has the following advantages or beneficial effects: by adding a partition to the top of the DC reactor to divide the first mounting cavity into a first upper mounting cavity and a first lower mounting cavity, the heat dissipation airflow inside the cabinet can be defined for the area where the electrolytic capacitor module and the DC reactor are located. The first fan blows outside air into the cabinet, and the second and third fans blow the air inside the cabinet out of the cabinet, realizing the circulation of air inside the cabinet and timely removing the heat inside the cabinet, thus effectively dissipating heat from the electrolytic capacitor module and the DC reactor.

[0023] In some embodiments of this application, the circuit breaker is provided with a first inlet cover plate on its top, and a plurality of wiring holes are formed on the first inlet cover plate, through which the inlet end of the circuit breaker extends to the top of the first inlet cover plate; The cable inlet includes a cable inlet passage on the top plate of the cabinet housing corresponding to the first mounting cavity and a second cable inlet cover plate covering the cable inlet passage. The second cable inlet cover plate is provided with multiple cable inlet holes, and the first cable inlet cover plate is located below the second cable inlet cover plate.

[0024] The inverter cabinet in the above technical solution has the following advantages or beneficial effects: the second inlet cover can be removed to facilitate the installation of the inlet cable, and the second inlet cover can also protect the inlet terminal of the circuit breaker; by setting the first inlet cover, external debris can be prevented from entering the cabinet through the inlet hole.

[0025] In some embodiments of this application, a chilled water air conditioning unit is also proposed, including the inverter cabinet described above.

[0026] The inverter cabinet in the above technical solution has the following advantages or beneficial effects: Since the inverter cabinet in this embodiment has a compact structure and small size, it can reduce the installation space requirements when it is fixedly installed on the chilled water air conditioning unit, and improve the convenience of installation.

[0027] Other features and advantages of this utility model will become clearer after reading the detailed embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a structural schematic diagram of the inverter cabinet according to an embodiment from one perspective; Figure 2 This is a structural schematic diagram of the inverter cabinet according to another perspective of an embodiment; Figure 3 This is a structural schematic diagram of the inverter cabinet according to an embodiment, omitting the rear view of the door. Figure 4 This is a structural schematic diagram of the inverter cabinet according to an embodiment, omitting the door. Figure 5 This is a schematic diagram of the inverter cabinet according to an embodiment, omitting the door and the top plate of the cabinet housing; Figure 6 for Figure 5 Top view; Figure 7 This is a schematic diagram of the inverter cabinet according to the embodiment, omitting the rectifier bridge heat sink, IGBT heat sink, and second incoming line cover. Figure 8 This is a schematic diagram of the rectifier bridge heat sink from one perspective according to an embodiment; Figure 9 This is a structural schematic diagram of the rectifier bridge heat sink according to an embodiment from another perspective; Figure 10 This is a schematic diagram of the air duct cover structure of the rectifier bridge heat sink according to an embodiment.

[0030] Figure label: 100. Cabinet; 110. First mounting cavity; 111. First upper mounting cavity; 112. First lower mounting cavity; 120. Second mounting cavity; 130. Third mounting cavity; 140. Fourth mounting cavity; 150. Power indicator light; 160. Handle; 170. Manual actuator; 180. Lifting eye nut; 190. Cable inlet; 191. Cable through section; 192. Second cable inlet cover; 193. First cable inlet cover. 194. Cable inlet; 195. Cable routing hole; 1100. Cable outlet; 1101. Cable outlet through-hole; 1102. Protective cover; 1200. Cabinet top plate; 1300. Cabinet bottom plate; 1400. Cabinet back plate; 1500. Cabinet left side plate; 1600. Cabinet right side plate; 1700. Rectifier bridge heat dissipation through-hole; 1800. IGBT heat dissipation through-hole; 1900. Partition; 200. Door body; 300. Circuit breaker; 400. DC reactor; 500. Rectifier bridge module; 600. Electrolytic capacitor module; 700, IGBT module; 800. Main control module; 810. First main control module; 820. Second main control module; 830. Vertical beam; 840. Hinge; 900. Rectifier bridge heat sink; 910. Heat sink body; 911. Heat sink base; 912. Heat sink fins; 920. Air duct cover; 921. Fan mounting port; 922. Air inlet; 923. Flange flange; 930. Cooling fan; 1000, IGBT heatsink; 2000, DC contactor; 3000, First Fan; 4000, Second Fan; 5000, third fan; 6000, Secondary control loop module; 7000, airflow gap; 8000, incoming copper busbar; 9000, copper busbars for wiring; 10000, Outgoing copper busbar. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this application.

[0033] 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. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0034] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0035] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0037] The air conditioner involved in this application performs a refrigeration cycle by using a compressor, condenser, expansion valve, and evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation to cool or heat an indoor space.

[0038] Low-temperature, low-pressure refrigerant enters the compressor, which compresses it into a high-temperature, high-pressure refrigerant gas and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0039] The expansion valve expands the high-temperature, high-pressure liquid refrigerant that condenses in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the expanded refrigerant in the expansion valve and returns the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves its cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the cycle, the air conditioner regulates the temperature of the indoor space.

[0040] The outdoor unit of an air conditioner refers to the part of the refrigeration cycle that includes the compressor and the outdoor heat exchanger. The indoor unit of an air conditioner includes the indoor heat exchanger, and an expansion valve can be provided in either the indoor or outdoor unit.

[0041] The indoor and outdoor heat exchangers function as either condensers or evaporators. When the indoor heat exchanger is used as a condenser, the air conditioner functions as a heater in heating mode; when the indoor heat exchanger is used as an evaporator, the air conditioner functions as a cooler in cooling mode.

[0042] Variable frequency centrifugal chiller units primarily use a compressor to apply energy to refrigerant vapor, increasing its pressure and temperature. After condensation and throttling, it becomes a low-pressure medium. The low-temperature refrigerant liquid evaporates in the evaporator, simultaneously absorbing heat from the surrounding environment (cooling agent) and lowering its temperature, thus achieving the purpose of cooling. Variable frequency centrifugal heat pump units primarily use a compressor to apply energy to refrigerant vapor, increasing its pressure and temperature. After condensation and throttling, it becomes a low-pressure medium. The gaseous refrigerant condenses in the condenser, simultaneously releasing heat to the surrounding environment (cooling agent) and raising its temperature, thus achieving the purpose of heating.

[0043] Specifically, the compressor adjusts the amount of refrigerant entering the compressor by adjusting the frequency and the opening of the inlet guide vanes. The low-temperature, low-pressure gaseous refrigerant evaporated from the evaporator is compressed by the first-stage impeller of the compressor. After mixing with the medium-temperature, medium-pressure saturated gas from the economizer, it is further compressed by the second-stage impeller, becoming a high-temperature, high-pressure gaseous refrigerant. This gaseous refrigerant then enters the condenser, where it is cooled by the cooling water and transforms into a high-temperature, high-pressure liquid refrigerant. The high-temperature, high-pressure liquid refrigerant is then reduced in pressure by the first-stage throttling process and enters the economizer, where it is separated into saturated liquid refrigerant and flashed gaseous refrigerant. The gaseous refrigerant enters the second-stage impeller of the compressor through the make-up gas line to continue the compression process. The liquid refrigerant, after being reduced in pressure by the second-stage throttling process, enters the evaporator, becoming a low-temperature, low-pressure liquid refrigerant, thus forming a main cycle.

[0044] The chilled water air conditioning unit disclosed in this application is specifically a variable frequency centrifugal chilled water air conditioning unit, which includes a condenser, evaporator and compressor, which are the main components of a central air conditioning system.

[0045] Chiller units include inverter cabinets. Figure 1This is a structural schematic diagram of the inverter cabinet from the front view. Figure 2 This is a structural schematic diagram from the rear view of the inverter cabinet. Figure 3 This is a structural diagram of the inverter cabinet without the doors; Figure 4 This is a structural schematic diagram from another perspective, omitting the inverter cabinet door.

[0046] Reference Figures 1 to 4 In some embodiments of this application, the inverter cabinet includes a cabinet 100, the cabinet 100 is equipped with a door 200, the door 200 is located on the front side of the cabinet 100, and the internal space of the cabinet 100 includes a first mounting cavity 110, a second mounting cavity 120, a third mounting cavity 130 and a fourth mounting cavity 140 arranged side by side along the horizontal direction of the cabinet 100.

[0047] by Figures 1 to 4 Taking the perspective shown as an example, the inverter cabinet is set as a double-door structure. The power indicator light 150 is placed on the left door panel, and the handle 160 for controlling the switch of the door 200 is placed on the right door panel. At the same time, the right door panel is equipped with a manual actuator 170 for external control of the circuit breaker 300. A lifting eye nut 180 for hoisting the cabinet 100 is installed around the top plate 1200 of the cabinet shell.

[0048] The inverter cabinet is installed on-board, with multiple screw holes (not shown due to viewing angle) around the bottom plate 1300 of the cabinet housing for screw fixing to the chilled water air conditioning unit.

[0049] The cabinet 100 is rectangular in shape, and the first mounting cavity 110, the second mounting cavity 120, the third mounting cavity 130 and the fourth mounting cavity 140 are arranged from right to left.

[0050] In some embodiments of this application, the frequency converter cabinet includes a circuit breaker 300, a DC reactor 400, a rectifier bridge module 500, an electrolytic capacitor module 600, an IGBT module 700, and a main control module 800. The above-mentioned electrical components are commonly used electrical components in frequency converter cabinets, and their functions are the same as those in the prior art, and will not be described in detail here.

[0051] like Figure 3 and Figure 4 As shown, the circuit breaker 300 is located in the upper region of the first mounting cavity 110; the DC reactor 400 is also located in the first mounting cavity 110 and on the cabinet housing bottom plate 1300 corresponding to the first mounting cavity 110, with the DC reactor 400 located below the circuit breaker 300; the rectifier bridge module 500 is located in the second mounting cavity 120; the electrolytic capacitor module 600 is located in the third mounting cavity 130; the IGBT module 700 is located in the fourth mounting cavity 140; and the main control module 800 is also located in the fourth mounting cavity 140.

[0052] The cabinet housing corresponding to the first mounting cavity 110 is provided with an inlet section 190, and the cabinet housing corresponding to the fourth mounting cavity 140 is provided with an outlet section 1100.

[0053] The cabinet housing corresponding to the second mounting cavity 120 is provided with a rectifier bridge heat sink 900 for heat dissipation of the rectifier bridge, and the cabinet housing corresponding to the fourth mounting cavity 140 is provided with an IGBT heat sink 1000 for heat dissipation of the IGBT module 700.

[0054] Specifically, the power supply line of the inverter cabinet is connected to the input terminal of the circuit breaker 300 through the input section 190 on the cabinet housing. The output terminal of the circuit breaker 300 is connected to the input terminal of the rectifier bridge module 500. The rectifier bridge module 500 rectifies the AC power into DC power. The positive terminal of the output terminal of the rectifier bridge module 500 is connected to the input terminal of the DC reactor 400. The output terminal of the DC reactor 400 is connected to the positive terminal of the electrolytic capacitor module 600. That is, the DC reactor 400 filters the DC power output from the rectifier bridge module 500 and then transmits it to the electrolytic capacitor module 600. The negative terminal of the output terminal of the rectifier bridge module 500 is connected to the negative terminal of the electrolytic capacitor module 600. The electrolytic capacitor module 600 is connected to the IGBT module 700. The IGBT module 700 then converts the DC power back into AC power, which is output from the output terminal of the IGBT module 700 to power the compressor.

[0055] By dividing the internal space of the cabinet 100 into a first mounting cavity 110, a second mounting cavity 120, a third mounting cavity 130, and a fourth mounting cavity 140 along the horizontal direction of the cabinet 100, and taking into account the size, function, and current flow of the circuit breaker 300, DC reactor 400, rectifier bridge module 500, electrolytic capacitor module 600, IGBT module 700, and main control module 800, they are installed in appropriate positions in the above four mounting cavities for a reasonable arrangement. This makes full use of the internal space of the cabinet, making the inverter cabinet structure more compact, the overall volume of the inverter cabinet smaller, and the weight lighter, which is more conducive to the air-mounted fixed installation on chilled water air conditioning units.

[0056] Compared to purchased inverter cabinets, the inverter cabinets in some embodiments of this application have lower costs.

[0057] For high-power heat-generating devices such as the rectifier bridge module 500 and IGBT module 700, corresponding rectifier bridge heat sink 900 and IGBT heat sink 1000 are provided to ensure good heat dissipation.

[0058] In some embodiments of this application, the circuit breaker 300 is mounted on the cabinet back plate 1400 corresponding to the first mounting cavity 110 via sheet metal fixing bracket screws; the DC reactor 400 is mounted on the cabinet bottom plate 1300 corresponding to the first mounting cavity 110 via sheet metal fixing bracket screws; the rectifier bridge module 500 includes multiple rectifier bridges spaced vertically, and the multiple rectifier bridges are uniformly fixed on a rectifier bridge fixing plate, which is fixed on the cabinet back plate 1400 corresponding to the second mounting cavity 120 with screws; the electrolytic capacitor module 600 is suspended and fixedly connected to the cabinet top plate 1200 corresponding to the third mounting cavity 130 via a sheet metal fixing bracket at its top.

[0059] In some embodiments of this application, the inverter cabinet also includes a DC contactor 2000, which is connected between the DC reactor 400 and the electrolytic capacitor module 600. The DC contactor 2000 can control and protect the circuit, reduce the bus current, and ensure the reliable operation of the electrolytic capacitor module 600. At the same time, the DC contactor 2000 is installed in the lower region of the second mounting cavity 120, which can make full use of the space of the second mounting cavity 120.

[0060] Figure 5 This is a schematic diagram of the inverter cabinet according to an embodiment, omitting the door and the top plate of the cabinet housing; Figure 6 for Figure 5 The top view. In some embodiments of this application, the IGBT module 700 and the main control module 800 are arranged longitudinally and longitudinally in the fourth mounting cavity 140. The IGBT module 700 is close to the cabinet housing back plate 1400 corresponding to the fourth mounting cavity 140, and the main control module 800 is located in front of the IGBT module 700. This can make full use of the longitudinal space of the fourth mounting cavity 140 and further improve the structural compactness.

[0061] In some embodiments of this application, the main control module 800 includes a first main control module 810 and a second main control module 820. The first main control module 810 and the second main control module 820 are arranged longitudinally and longitudinally along the cabinet 100, with the first main control module 810 located in front of the second main control module 820. By separating the main control module 800 into two parts, namely the first main control module 810 and the second main control module 820, the longitudinal space of the fourth mounting cavity 140 can be fully utilized, and the distributed arrangement of various electrical components on the main control module 800 can be facilitated, thereby simplifying fixing and wiring.

[0062] One side of the first main control module 810 is hinged to the cabinet housing corresponding to the fourth mounting cavity 140 to realize the flip-out setting of the first main control module 810. By flipping the first main control module 810, it is convenient to fix the second main control module 820 on the rear side and to connect the wiring.

[0063] like Figure 4 As shown, a vertical beam 830 is fixed on the cabinet shell side panel (i.e., the cabinet shell left side panel 1500) corresponding to the fourth mounting cavity 140. The first main control module 810 is fixed on the sheet metal bracket. The side of the sheet metal bracket is hinged to the vertical beam 830 through a hinge 840 to realize the flip installation of the first main control module 810. The second main control module 820 is fixedly connected to the cabinet shell top plate 1200 corresponding to the fourth mounting cavity 140 through the sheet metal bracket located above it. Openings are designed at corresponding positions on the sheet metal brackets corresponding to the first main control module 810 and the second main control module 820 to facilitate wiring.

[0064] In some embodiments of this application, the rectifier bridge module 500 is located in the upper region of the second mounting cavity 120 and close to the cabinet housing back plate 1400 corresponding to the second mounting cavity 120. Specifically, it can be fixed to the cabinet housing back plate 1400 corresponding to the second mounting cavity 120 with screws using the aforementioned rectifier bridge fixing plate. The rectifier bridge heat sink 900 is detachably mounted on the outer surface of the cabinet housing back plate 1400 corresponding to the second mounting cavity 120. The rectifier bridge heat sink 900 is detachable, thus facilitating disassembly and replacement.

[0065] Similarly, in some embodiments of this application, the IGBT heat sink 1000 is detachably mounted on the outer surface of the cabinet housing back plate 1400 corresponding to the fourth mounting cavity 140, so as to facilitate disassembly and replacement.

[0066] Figure 7 A schematic diagram of the inverter cabinet after omitting the rectifier bridge heat sink, IGBT heat sink, and first incoming line cover; Figure 8 A schematic diagram of the rectifier bridge heat sink from one perspective; Figure 9 This is a structural schematic diagram of the rectifier bridge heat sink from another perspective. Figure 10 This is a schematic diagram of the air duct cover structure of the rectifier bridge heat sink.

[0067] In some embodiments of this application, reference is made to Figures 7 to 10 At the same time, combined Figure 2 The second mounting cavity 120 has a rectifier bridge heat dissipation passage 1700 formed on the cabinet shell back plate 1400, and the rectifier bridge heat dissipation passage 1700 corresponds to the position of the rectifier bridge heat sink 900.

[0068] The rectifier bridge heat sink 900 includes a heat sink body 910 and an air duct cover 920. The heat sink body 910 is attached to the outer surface of the cabinet shell back plate 1400 corresponding to the second mounting cavity 120 and covers the rectifier bridge heat dissipation through part 1700. The air duct cover 920 is attached to the outer surface of the cabinet shell back plate 1400 corresponding to the second mounting cavity 120 and surrounds the outside of the heat sink body 910. The air duct cover 920 has a fan mounting port 921 and an air inlet 922. A cooling fan 930 is installed in the fan mounting port 921.

[0069] By designing the rectifier bridge heat sink 900 to include a heat sink body 910 and an air duct cover 920, the air duct cover 920 can form a heat dissipation air duct with the cabinet shell back plate 1400 corresponding to the second mounting cavity 120. One end of the heat dissipation air duct is connected to the space inside the second mounting cavity 120 where the rectifier bridge module 500 is located through the rectifier bridge heat dissipation through part 1700, and the other end is connected to the outside through the air inlet 922.

[0070] The cooling fan 930 is specifically an intake fan. When it is working, the heat generated by the rectifier bridge module 500 is drawn into the cooling duct through the rectifier bridge cooling passage 1700, flows through the heat sink body 910, and is then discharged by the cooling fan 930. The low-temperature outside air is drawn into the cooling duct through the air inlet 922 and flows through the heat sink body 910, which can dissipate heat from the heat sink body 910, thereby enhancing the heat dissipation of the rectifier bridge module 500 and improving the heat dissipation effect.

[0071] The inverter cabinet in the above technical solution has the following advantages or beneficial effects: by adopting the above-mentioned rectifier bridge heat sink 900 structure, the external cooling fan 930 and the heat sink body 910 can be combined to enhance the heat dissipation of the rectifier bridge module 500 and improve the heat dissipation effect.

[0072] In some embodiments of this application, the fan mounting port 921 and the air inlet 922 are arranged opposite to each other. Multiple fan mounting ports 921 are arranged along the height direction of the air duct cover plate 920, and each fan mounting port 921 is equipped with a cooling fan 930.

[0073] Similarly, such as Figure 7 As shown, and in combination Figure 2 An IGBT heat dissipation passage 1800 is formed on the cabinet shell back plate 1400 corresponding to the fourth mounting cavity 140, and the IGBT heat dissipation passage 1800 corresponds to the position of the IGBT heat sink 1000.

[0074] In some embodiments of this application, the structure of the IGBT heat sink 1000 is the same as that of the rectifier bridge heat sink 900, and will not be described again here. In the installed state, the air inlet of the IGBT heat sink 1000 is opposite to the air inlet 922 of the rectifier bridge heat sink 900, and the cooling fan of the IGBT heat sink 1000 is opposite to the cooling fan 930 of the rectifier bridge heat sink 900 to avoid interference of cooling airflow.

[0075] In some embodiments of this application, the heat sink bodies 910 of the rectifier bridge heat sink 900 and the IGBT heat sink 1000 are finned heat sinks, including a heat sink base 911 and a plurality of heat sink fins 912. The heat sink base 911 of the rectifier bridge heat sink 900 is embedded in the rectifier bridge heat dissipation through-hole 1700, and the heat sink base of the IGBT heat sink 1000 is embedded in the IGBT heat dissipation through-hole 1800, so as to fit and contact the rectifier bridge module 500 and the IGBT module 700 respectively, thereby improving the heat dissipation effect. The periphery of the air duct cover 920 has a flange 923, which is fixed to the cabinet housing back plate 1400 by screw fastening.

[0076] To dissipate heat from the electrolytic capacitor module 600 and the DC reactor 400, and to enhance the heat dissipation effect of the inverter cabinet in this application, in some embodiments of this application, such as Figure 1 , Figures 3 to 6 As shown, a partition 1900 is provided inside the first mounting cavity 110, which divides the first mounting cavity 110 into a first upper mounting cavity 111 and a first lower mounting cavity 112.

[0077] The circuit breaker 300 is located in the first upper mounting cavity 111, and the DC reactor 400 is located in the first lower mounting cavity 112. The cabinet housing side plate (i.e., the cabinet housing right side plate 1600) corresponding to the first lower mounting cavity 112 is provided with a first fan 3000. The electrolytic capacitor module 600 is provided with a second fan 4000 on one side. The second fan 4000 is close to the side where the second mounting cavity 120 is located and faces the first upper mounting cavity 111.

[0078] A third fan 5000 is provided on the cabinet shell side panel (i.e., the cabinet shell right side panel 1600) corresponding to the first upper mounting cavity 111.

[0079] The first fan 3000 is configured to blow outside air into the cabinet 100 through the first lower mounting cavity 112, and the second fan 4000 and the third fan 5000 are configured to blow air from inside the cabinet 100 out of the cabinet 100 through the first upper mounting cavity 111. That is, the first fan 3000 is a blower fan, and the second fan 4000 and the third fan 5000 are suction fans.

[0080] By adding a partition 1900 to the top of the DC reactor 400 to divide the first mounting cavity 110 into a first upper mounting cavity 111 and a first lower mounting cavity 112, a heat dissipation airflow channel can be defined in the area where the electrolytic capacitor module 600 and the DC reactor 400 are located. The first fan 3000 blows outside air into the cabinet 100, and the second fan 4000 and the third fan 5000 blow the air inside the cabinet 100 out of the cabinet 100, so as to realize the circulation of air inside the cabinet and carry away the heat inside the cabinet 100 in time, and effectively dissipate heat from the electrolytic capacitor module 600 and the DC reactor 400.

[0081] In some embodiments of this application, such as Figure 5 and Figure 6 As shown, an airflow gap 7000 is left between the electrolytic capacitor module 600 and the cabinet shell back plate 1400 corresponding to the third mounting cavity 130, thereby increasing the contact area between the electrolytic capacitor module 600 and the heat dissipation airflow, improving the smoothness of air circulation inside the cabinet, and further improving the heat dissipation effect.

[0082] In some embodiments of this application, the inverter cabinet further includes a secondary control loop module 6000, which is disposed within the third mounting cavity 130 and located below the electrolytic capacitor module 600 to fully utilize the space of the third mounting cavity 130. The secondary control loop module 6000 includes a secondary control module, a switching power supply, and terminal blocks. The switching power supply is used to supply power to the cooling fan 930, the first fan 3000, the second fan 4000, and the third fan 5000. The secondary control module controls the operating state of the switching power supply to supply or de-energize the cooling fan 930, the first fan 3000, the second fan 4000, and the third fan 5000. The terminal blocks are used to connect to the electrical control cabinet of the chiller unit to realize signal transmission between the inverter cabinet and the electrical control cabinet of the chiller unit.

[0083] In some embodiments of this application, such as Figures 1 to 7 As shown, the circuit breaker 300 has a first inlet cover plate 193 on its top, and a plurality of wiring holes 195 are formed on the first inlet cover plate 193. The inlet end of the circuit breaker 300 extends through the wiring holes 195 to the top of the first inlet cover plate 193.

[0084] For the cable inlet 190 of the cabinet housing corresponding to the first mounting cavity 110, such as Figures 1 to 7 As shown, the cable inlet 190 includes a cable inlet passage 191 and a second cable inlet cover 192 provided on the cabinet housing top plate 1200 corresponding to the first mounting cavity 110. The second cable inlet cover 192 is fixed to the cabinet housing top plate 1200 corresponding to the first mounting cavity 110 by screws or clips and covers the cable inlet passage 191. The second cable inlet cover 192 is provided with a plurality of cable inlet holes 194. The first cable inlet cover 193 is located below the second cable inlet cover 192.

[0085] The first inlet cover plate 193 and the second inlet cover plate 192 can form an inlet cavity. The inlet installation can be facilitated by disassembling the second inlet cover plate 192, and the second inlet cover plate 192 can also protect the inlet terminal of the circuit breaker 300. By setting the first inlet cover plate 193, external debris can be prevented from entering the cabinet 100 through the inlet hole 194 on the second inlet cover plate 192.

[0086] In some embodiments of this application, the wiring outlet 1100 on the cabinet housing corresponding to the fourth mounting cavity 140 is also as follows: Figures 1 to 7 As shown, it includes a cabinet housing side panel (with) located in the fourth mounting cavity 140. Figures 1 to 7 From the shown perspective, this section shows the cable outlet 1101 and protective cover 1102 on the left side panel 1500 of the cabinet housing. The protective cover 1102 has multiple cable outlet holes (not shown due to perspective). The protective cover 1102 is fixed to the cabinet housing side panel corresponding to the fourth mounting cavity 140 by screws or clips, and covers the cable outlet 1101. The cable outlet of the IGBT module 700 extends through the cable outlet 1101 into the space covered by the protective cover 1102, and the wiring harness connecting to the compressor is led out through the multiple cable outlet holes. The protective cover 1102 protects the cable outlet of the IGBT module 700.

[0087] In some embodiments of this application, the cable outlet on the protective cover 1102 is located on the bottom surface of the protective cover 1102 to provide a certain degree of waterproof and dustproof function.

[0088] In some embodiments of this application, copper busbars are used for electrical connections between various electrical components. For example, the incoming terminal of circuit breaker 300 is connected to incoming copper busbar 8000, circuit breaker 300 is connected to rectifier bridge module 500 through routing copper busbar 9000, the outgoing terminal of IGBT module 700 is outgoing copper busbar 10000, the incoming and outgoing terminals of DC reactor 400 are also copper busbars, and the incoming and outgoing terminals of DC contactor 2000 are also copper busbars. Using copper busbars for connections offers high current carrying capacity, facilitates multi-layer layout and flexible wiring, and is also cost-effective, providing high stability and safety.

[0089] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0090] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A frequency converter cabinet, characterized in that, include: The cabinet has an internal space comprising a first mounting cavity, a second mounting cavity, a third mounting cavity, and a fourth mounting cavity arranged side by side along the horizontal direction of the cabinet. A circuit breaker is located in the upper region of the first mounting cavity; A DC reactor is disposed in the first mounting cavity and located on the bottom plate of the cabinet shell corresponding to the first mounting cavity, and the DC reactor is located below the circuit breaker; The rectifier bridge module is located inside the second mounting cavity; An electrolytic capacitor module is disposed within the third mounting cavity; The IGBT module is located within the fourth mounting cavity; The main control module is located inside the fourth mounting cavity; The cabinet housing corresponding to the first mounting cavity is provided with an inlet section, and the cabinet housing corresponding to the fourth mounting cavity is provided with an outlet section; The cabinet housing corresponding to the second mounting cavity is equipped with a rectifier bridge heat sink, and the cabinet housing corresponding to the fourth mounting cavity is equipped with an IGBT heat sink.

2. The frequency converter cabinet according to claim 1, characterized in that, Also includes: A DC contactor is connected between the DC reactor and the electrolytic capacitor module, and the DC contactor is located in the lower region of the second mounting cavity.

3. The frequency converter cabinet according to claim 1, characterized in that, The IGBT module and the main control module are arranged longitudinally and longitudinally along the cabinet, with the IGBT module close to the cabinet shell back panel corresponding to the fourth mounting cavity, and the main control module located in front of the IGBT module.

4. The frequency converter cabinet according to claim 3, characterized in that, The main control module includes a first main control module and a second main control module arranged longitudinally and longitudinally along the cabinet. The first main control module is located in front of the second main control module. One side of the first main control module is hinged to the cabinet shell corresponding to the fourth mounting cavity to realize the flip-out setting of the first main control module.

5. The frequency converter cabinet according to claim 1, characterized in that, The rectifier bridge module is located in the upper region of the second mounting cavity and close to the cabinet housing back plate corresponding to the second mounting cavity. The rectifier bridge heat sink is detachably mounted on the outer surface of the cabinet housing back plate corresponding to the second mounting cavity.

6. The frequency converter cabinet according to claim 3, characterized in that, The IGBT heat sink is detachably mounted on the outer surface of the cabinet housing back plate corresponding to the fourth mounting cavity.

7. The frequency converter cabinet according to claim 5 or 6, characterized in that, A rectifier bridge heat dissipation passage is formed on the back panel of the cabinet corresponding to the second mounting cavity; The rectifier bridge radiator includes a radiator body and an air duct cover. The radiator body is attached to and fixed on the outer surface of the cabinet shell back panel corresponding to the second mounting cavity, and covers the rectifier bridge heat dissipation through part. The air duct cover is attached to and fixed on the outer surface of the cabinet shell back panel corresponding to the second mounting cavity, and surrounds the outside of the radiator body. The air duct cover has a fan mounting port and an air outlet, and a cooling fan is installed in the fan mounting port.

8. The frequency converter cabinet according to claim 1, characterized in that, The first mounting cavity is provided with a partition to divide it into a first upper mounting cavity and a first lower mounting cavity. The circuit breaker is located in the first upper mounting cavity, and the DC reactor is located in the first lower mounting cavity. A first fan is provided on the cabinet shell side panel corresponding to the first lower mounting cavity. A second fan is provided on one side of the electrolytic capacitor module, which is close to the side where the second mounting cavity is located and faces the first upper mounting cavity. A third fan is provided on the cabinet shell side panel corresponding to the first upper mounting cavity. The first fan is configured to blow outside air into the cabinet through the first lower mounting cavity, and the second fan and the third fan are configured to blow air out of the cabinet through the first upper mounting cavity.

9. The frequency converter cabinet according to claim 1, characterized in that, The circuit breaker is provided with a first inlet cover plate on its top. Multiple wiring holes are formed on the first inlet cover plate. The inlet end of the circuit breaker extends through the wiring holes to the top of the first inlet cover plate. The cable inlet includes a cable inlet passage on the top plate of the cabinet housing corresponding to the first mounting cavity and a second cable inlet cover plate covering the cable inlet passage. The second cable inlet cover plate is provided with multiple cable inlet holes, and the first cable inlet cover plate is located below the second cable inlet cover plate.

10. A chilled water air conditioning unit, characterized in that, The inverter cabinet includes any one of claims 1 to 9.

Images