Centralized photovoltaic inverter and photovoltaic power station

Abstract

The invention discloses a centralized photovoltaic inverter and a photovoltaic power station, an air inlet and an air outlet of a heat exchange device of the centralized photovoltaic inverter are horizontally arranged, the top of a shell can be closed, and sand is not easy to accumulate. The two heat exchange units are symmetrically arranged in the shell, the two heat dissipation fans are oppositely arranged on the two first side walls or the two second side walls correspondingly and correspond to the two air inlets or the two air outlets, and the heat exchange structure corresponding to each heat dissipation fan comprises two heat exchange parts which are arranged in an included angle mode. The two heat exchange structures are arranged in the shell, so that air flow can enter from the two first side walls of the shell, fully exchanges heat with the four heat exchange parts of the two heat exchange structures, then turns to be exhausted from the air outlets in the two second side walls, and therefore the large air volume and the high heat exchange efficiency are achieved; and the air inlet and the air outlet are arranged along different directions, and the hot air outlet is not arranged on the combined cabinet surface, so that the problem of mutual airflow interference can be well avoided when a plurality of cabinets are used to form a photovoltaic power station.

Description

Technical Field

[0001] This invention relates to the field of heat dissipation in electrical equipment, and more specifically to a centralized photovoltaic inverter and a photovoltaic power station. Background Technology

[0002] Centralized photovoltaic inverters, large-scale energy storage converters, and other high-power electrical equipment typically have high heat dissipation requirements.

[0003] In the field of energy storage, existing technologies often use a combination of air cooling and liquid cooling to dissipate heat from electrical equipment. For example, in patent CN117641836A, a liquid cooling unit is installed in the top air passage cavity, and a heat exchange device is placed within the air passage cavity with two heat exchange sections. These two heat exchange sections intersect at one end horizontally and are separated by the other end. The air passage ducts of the heat exchange sections are horizontal. To avoid the heat island effect caused by the dense arrangement of electrical equipment in the energy storage power station, and to ensure that the airflow completely passes through the two heat exchange sections, the cooling fan is arranged horizontally with the heat exchange sections and installed at the top exhaust port. However, in practical applications, the diameter of the cooling fan cannot be designed too large due to limitations in the depth and width of the electrical equipment. Consequently, the airflow of the heat exchange device is relatively insufficient, and the overall heat dissipation efficiency and capacity of the heat exchange device are relatively low. Clearly, this design sacrifices heat dissipation efficiency and capacity to ensure top-outlet airflow.

[0004] In the photovoltaic field, especially in large-scale photovoltaic power plants, the density of high-power equipment such as centralized photovoltaic inverters is relatively relaxed compared to energy storage power plants, resulting in a smaller impact from the heat island effect. Furthermore, photovoltaic power plants are typically built in areas prone to tornadoes or sandstorms, bringing greater risks of sand and dust accumulation. Therefore, liquid-cooled units for energy storage converters with top-outlet airflow are not suitable for photovoltaic inverters. It's worth noting that while centralized photovoltaic inverters do not have scenarios where two cabinets are closely fitted together, there are still situations where two or more cabinets are used side-by-side, with a distance of approximately several meters between them. Therefore, when designing liquid-cooled units for centralized photovoltaic inverters, the potential airflow interference issues arising from side-by-side cabinets spaced several meters apart still need to be considered. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned defects or problems in the background technology and provide a centralized photovoltaic inverter and photovoltaic power station with strong heat dissipation capacity and high heat dissipation efficiency, and in the case of multiple cabinets, it can better avoid the problem of airflow interference between them.

[0006] To achieve the above objectives, the present invention and its preferred embodiments employ the following technical solutions, but the embodiments are not limited to the following solutions:

[0007] Technical Solution 1 and its related embodiments provide a centralized photovoltaic inverter, including a cabinet and a heat exchange device fixed in the cabinet; the cabinet has a parallel surface perpendicular to the horizontal X-axis direction; the heat exchange device includes: a shell, which has first sidewalls arranged parallel to each other and opposite to each other along the X-axis direction, and second sidewalls arranged parallel to each other and opposite to each other along the horizontal Y-axis direction, both first sidewalls are provided with air inlets, and both second sidewalls are provided with air outlets; and two heat exchange units, which are symmetrically arranged in the shell along the horizontal direction; each heat exchange unit includes a heat exchange structure and a cooling fan; the heat exchange structure includes two heat exchange parts that are angled to each other to form an open end, each heat exchange part extends along the vertical Z-axis direction and is provided with a cooling part and several air passages along the horizontal direction; the cooling fan is arranged corresponding to the open end of the heat exchange structure, and the two cooling fans are respectively arranged opposite to each other on the two first sidewalls or the two second sidewalls, for driving airflow from the air inlet through the air passages of each heat exchange part to the air outlet. Based on technical solution one, there is also technical solution two. In technical solution two and its related embodiments, there is also a coolant pipe; two cooling fans are respectively installed at two air outlets; two heat exchange units are arranged at intervals along the Y-axis and both abut against the top wall of the shell; each heat exchange unit is provided with a supply end and a return end; the supply ends of the two heat exchange units are connected through the coolant pipe to form a total input end, and the return ends of the two heat exchange units are connected through the coolant pipe to form a total output end; the coolant pipe passes through the gap between the two heat exchange units.

[0008] Based on technical solution one, there is also technical solution two. In technical solution two and its related embodiments, the heat exchange device is placed on the top of the cabinet, the cabinet and the shell are sized to match, and their lengths along the Y-axis are both greater than their lengths along the X-axis.

[0009] Based on technical solution two, there is also technical solution three. In technical solution three and its related embodiments, the heat exchange device further includes a coolant pipe; two cooling fans are respectively installed at the two second side walls; two heat exchange units are arranged at intervals along the Y-axis and both abut against the top wall of the shell; each heat exchange unit has a supply end and a return end, the supply ends of the two heat exchange units are connected through the coolant pipe to form a total input end, and the return ends of the two heat exchange units are connected through the coolant pipe to form a total output end; the coolant pipe passes through the gap between the two heat exchange units.

[0010] Based on technical solution three, there is also technical solution four. In technical solution four and its related embodiments, one of the two heat exchange sections is defined as a first heat exchange section and the other as a second heat exchange section. The first heat exchange section is parallel to the Y-axis direction and forms a first gap with the first sidewall. The second heat exchange section is inclined relative to both the X-axis direction and the Y-axis direction. The total input end and the total output end are both located in one of the first gaps and close to the second sidewall.

[0011] Based on technical solution four, there is also technical solution five. In technical solution five and its related embodiments, the two first heat exchange sections are far apart from each other along the X-axis; the air inlet includes a sub-air inlet corresponding to each heat exchange unit.

[0012] Based on technical solution four, technical solution six is ​​also provided. In technical solution six and its related embodiments, each heat exchange structure further includes a connecting plate, which extends vertically and connects the ends of the two heat exchange sections away from the cooling fan. The heat exchange device also includes a coolant delivery component and an electrical connector located within the housing. The coolant delivery component includes two pumps, which are respectively located in two air outlet channels and connected to the total input end and the total output end through the coolant pipe, driving coolant to flow from the total input end to the total output end. The coolant pipe passes through the connecting plate. The electrical connector is used to realize the electrical connection between the heat exchange device and the cabinet, and it is placed in another first interval near the second side wall. The replenishing component is located in the same first interval as the total input end and the total output end. Based on technical solution six, technical solution seven is also provided. In technical solution seven and its related embodiments, an electrical connector is also included. The electrical connector is used to realize the electrical connection between the heat exchange device and the outside, and it is placed in another first interval near the second side wall. The replenishing component is located in the same first interval as the total input end and the total output end.

[0013] Based on technical solution six, technical solution seven is also provided. In technical solution seven and its related embodiments, the heat exchange device further includes a liquid replenishment component located in one of the first intervals. The coolant pipe is provided with a liquid replenishment end in the first interval where the liquid replenishment component is located. The liquid replenishment component is provided with a liquid replenishment port communicating with the liquid replenishment end. The liquid replenishment port is higher than the liquid replenishment end. An expansion cap is provided at the top of the liquid replenishment component. A pressure relief valve is provided on the expansion cap. The distance between the highest water level of the liquid in the liquid replenishment component and the top wall of the liquid replenishment component is greater than a first value.

[0014] Based on technical solution seven, technical solution eight is also provided. In technical solution eight and its related embodiments, the first heat exchange section is formed by at least two third heat exchange sections attached along its thickness direction, and the second heat exchange section is formed by at least two fourth heat exchange sections attached along its thickness direction. Each third heat exchange section and each fourth heat exchange section are provided with an inlet section, a section to be cooled, and an outlet section in sequence along its length direction. The section to be cooled is provided with alternating coolant flow channels and air passages along the Z-axis direction. The inlet section is provided with an inlet end, and the outlet section is provided with an outlet end. The inlet sections of two adjacent third heat exchange sections are far apart from each other so that each third heat exchange section is connected in series, and the inlet sections of two adjacent fourth heat exchange sections are far apart from each other so that each fourth heat exchange section is connected in series. The inlet ends of the first heat exchange section and the second heat exchange section are connected in parallel to form the supply end of the heat exchange unit, and the outlet ends of the first heat exchange section and the second heat exchange section are connected in parallel to form the return end of the heat exchange unit. The supply ends of the two heat exchange units are connected in parallel to form the total input end, and the return ends are connected in parallel to form the total output end.

[0015] Based on any one of technical solutions one to eight, a technical solution nine is also provided. In technical solution nine and its related embodiments, the centralized photovoltaic inverter further includes a phase change heat pipe heat exchanger; the phase change heat pipe heat exchanger has a cold side and a hot side, the hot side extending into the cabinet body; the cold side extends into the housing and is disposed near one of the first side walls, so as to use the cold air entering the corresponding air inlet to dissipate heat from the airflow inside the cabinet body.

[0016] Technical solution ten and its related embodiments provide a photovoltaic power station, which includes at least two centralized photovoltaic inverters as described in any one of technical solutions one to nine; the at least two centralized photovoltaic inverters are arranged at a distance of D meters along the X-axis direction; and D is less than 10.

[0017] As can be seen from the above description of the present invention and its preferred embodiments, compared with the prior art, the technical solution of the present invention and its preferred embodiments have the following beneficial effects due to the adoption of the following technical means:

[0018] In technical solution one and its preferred embodiment, the air inlet and outlet of the heat exchange device are horizontally arranged, the air passage of the heat exchange section is horizontal, and the top of the shell can be sealed, so sand and dust are not easily allowed to enter the heat exchange device from the air outlet, and sand accumulation is not easy. Two heat exchange units are symmetrically arranged in the shell, and two cooling fans are respectively installed opposite to each other on the two first side walls or the two second side walls, corresponding to the two air inlets or the two air outlets. The heat exchange structure corresponding to each cooling fan includes two heat exchange sections arranged at an angle, so that the airflow can enter from the two first side walls of the shell, and after fully exchanging heat with the four heat exchange sections of the two heat exchange structures, it is then turned and discharged through the air outlets on the two second side walls.

[0019] Therefore, compared to setting up only one large heat exchange section, multiple heat exchange sections are set at an angle to the inlet airflow, resulting in a larger heat exchange area and higher heat exchange efficiency. Furthermore, since there are multiple heat exchange sections, and each pair of heat exchange sections is equipped with a cooling fan, the diameter of the cooling fan can be set according to the size of the air inlet or outlet. The size of the air inlet can be set according to the length of the casing along the Y-axis, and the size of the air outlet can be set according to the length of the casing along the X-axis. This avoids the drawback of having to place the cooling fan in the corner of the casing to ensure that the airflow passes fully through a large heat exchange section. The cooling fan can have a larger diameter, thus having a larger airflow. Therefore, each heat exchange unit has high heat dissipation efficiency and a large heat dissipation capacity.

[0020] Furthermore, the cabinet's parallel surface is perpendicular to the X-axis. The air inlet draws in cold air along the X-axis, and the air outlet discharges hot air along the Y-axis. The air inlet and outlet are positioned in different directions, and the hot air outlet is not located on the parallel surface. This prevents short-circuiting of hot airflow when multiple centralized photovoltaic inverters are used in parallel, avoiding situations where hot air from one cabinet blows along the X-axis to the cold air inlet of another, or where hot air from two cabinets blows against each other along the X-axis and then disperses to both sides along the Y-axis before being drawn back into their respective air inlets. It also eliminates the need to create A and B mirror machines for every two parallel centralized photovoltaic inverters to avoid such hot airflow short-circuiting, with their air outlets discharging hot air to opposite sides along the X-axis. Therefore, this design effectively avoids airflow interference issues when centralized photovoltaic inverters are used in multi-cabinet scenarios.

[0021] In the second technical solution and its preferred embodiment, the length of the cabinet along the Y-axis is greater than its length along the X-axis. Therefore, when multiple centralized photovoltaic inverters are used together, they are often arranged in parallel cabinets at intervals along the X-axis. In this way, the spacing between the centralized photovoltaic inverters only needs to meet the air intake requirements of two adjacent centralized photovoltaic inverters, which facilitates the arrangement of multiple centralized photovoltaic inverters.

[0022] In technical solution three and its preferred embodiments, two cooling fans are respectively installed on the two second side walls, corresponding to the two air outlets. Compared with installing them at the air inlet, this results in lower wind resistance and higher heat dissipation efficiency. The coolant pipe passes through the gap between the two heat exchange units, making installation convenient. Compared to laying coolant pipes on top of the heat exchange section to connect the supply or return ends of the two heat exchange units, the heat exchange section has a higher height along the Z-axis, given a fixed height of the casing, thus improving heat exchange efficiency. The air inlet is located on the first side wall, and the air outlet is located on the second side wall. The cooling fans are installed at the air outlets, thus creating a larger gap between the heat exchange units and the first side wall. This gap allows for the placement of other parts of the heat exchange device, making the heat exchange device modular.

[0023] In technical solution four and its preferred embodiments, the first heat exchange section is parallel to the Y-axis and forms a gap with the first sidewall. The second heat exchange section is inclined relative to both the X-axis and Y-axis. The total input end and the total output end are located in one of the first gaps and close to the second sidewall. This makes the external coolant pipe connection of the entire heat exchange device more concentrated, which facilitates connection with other heat-generating components that need heat dissipation, and makes installation and maintenance more convenient. Moreover, with this setting, since the wind direction conversion angle of the first heat exchange section is larger than that of the second heat exchange section, the wind resistance of the first heat exchange section is also larger than that of the second heat exchange section. The above setting makes the length of the second heat exchange section longer than that of the first heat exchange section, thereby achieving a good balance between the air passage efficiency of the first heat exchange section and the second heat exchange section, thus ensuring the air passage in the angled area of ​​the heat exchange unit.

[0024] In technical solution five and its preferred embodiment, the two first heat exchange sections are far apart from each other along the X-axis, which makes the interval between the two heat exchange units along the Y-axis larger, which is more conducive to the installation of the coolant pipe; the air inlet includes a sub-air inlet corresponding to each heat exchange unit, so that each heat exchange unit has a large air volume in the X-axis direction and high heat dissipation efficiency.

[0025] In technical solution six and its preferred embodiments, the coolant delivery component includes two pumps, each located in one of two air outlet channels. Compared to a single pump, this not only improves the coolant delivery efficiency but also enhances the utilization of space within the casing. Furthermore, placing the electrical connectors connecting the heat exchanger to external electrical components within the first interval, compared to placing them around external electrical connectors, provides better protection for the external connectors, facilitates maintenance and operation, and allows for modular electrical wiring.

[0026] In technical solution seven and its preferred embodiments, the electrical connector is placed near the second sidewall within another first interval, and the liquid replenishment component is located within the same first interval as the main input and main output terminals. This facilitates maintenance of the liquid replenishment component and achieves water-electricity separation as much as possible. Furthermore, the liquid replenishment port of the liquid replenishment component is higher than the liquid replenishment end, placing the liquid replenishment component at the highest point of the liquid path, thus enabling automatic liquid replenishment to the liquid replenishment end under gravity, simplifying operation. The replenishing unit is equipped with an expansion cap, which has a pressure relief valve. The distance between the highest liquid level in the replenishing unit and the top wall of the replenishing unit is greater than a first value. Therefore, when the pressure in the coolant pipe is high, the pressure in the coolant pipe can flow to the replenishing unit, causing the liquid level in the replenishing unit to rise and compress the gas above the liquid, thus opening the pressure relief valve on the expansion cap. In other words, the pressure relief valve on the expansion cap can relieve pressure in the coolant pipe, preventing excessive pressure in the coolant pipe. When the pressure in the coolant pipe is low, the replenishing unit can replenish liquid to the replenishing position under the action of gravity. Thus, the replenishing unit integrates the functions of a replenishing water tank and an expansion tank, ensuring that the coolant pipe operates under a relatively stable pressure. Therefore, there is no need to set up an expansion tank in the heat exchange device, reducing the volume of the heat exchange device and making the structure of the heat exchange device compact and simple.

[0027] In technical solution eight and its preferred embodiments, the first heat exchange section is formed by at least two third heat exchange sections attached along its thickness direction, and the second heat exchange section is formed by at least two fourth heat exchange sections attached along its thickness direction. This allows the thickness of the first and second heat exchange sections to be adjusted according to heat dissipation requirements, resulting in a wider range of applications and lower costs. The liquid inlet sections of two adjacent third heat exchange sections are far apart from each other to connect them in series, and the liquid inlet sections of two adjacent fourth heat exchange sections are far apart from each other to connect them in series. The liquid inlet ends of the first and second heat exchange sections are connected in parallel to form the liquid supply end of the heat exchange unit, and the liquid outlet ends of the first and second heat exchange sections are connected in parallel to form the liquid return end of the heat exchange unit. This makes the laying of coolant pipes more convenient. The liquid supply ends of the two heat exchange units are connected in parallel to form a total input end, and the liquid return ends are connected in parallel to form a total output end. This results in low flow resistance and consistent pipe temperature rise, thereby reducing pump power.

[0028] In technical solution nine and its preferred embodiments, the centralized photovoltaic inverter also includes a phase change heat pipe heat exchanger, which utilizes the phase change heat transfer medium within the heat pipe to dissipate heat from the airflow inside the cabinet, thereby reducing the ambient temperature inside the cabinet. Specifically, the heat pipe of the phase change heat pipe heat exchanger has a cold side and a hot side, both of which can be equipped with heat sinks to facilitate sufficient heat exchange between the airflow at the corresponding location and the phase change heat transfer medium within the heat pipe. The hot side and cold side are located inside the cabinet and shell, respectively, allowing for the reduction of the ambient temperature inside the cabinet without introducing external ambient airflow into the cabinet and ensuring the cabinet's protective effect. The cold airflow from the air inlet on the cold side, which extends into the shell and shares the first sidewall with the heat exchange structure, can be fully utilized, facilitating the installation of the phase change heat pipe heat exchanger.

[0029] Technical solution ten has the technical advantages of any one of technical solutions one through nine. The photovoltaic power station includes multiple centralized photovoltaic inverters arranged in cabinets at intervals of several meters. Due to the above structural design, it can better avoid the problem of airflow interference between them. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments are briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of a centralized photovoltaic inverter according to an embodiment of the present invention;

[0032] Figure 2 This is a top view of the heat exchange device with its top wall hidden, according to Embodiment 1 of the present invention.

[0033] Figure 3 A side chamber diagram of the heat exchange device of Embodiment 1 of the present invention, showing one of the first side walls hidden;

[0034] Figure 4 A side view of the heat exchange device of Embodiment 1 of the present invention, concealing the other first sidewall;

[0035] Figure 5 This is a top view of the heat exchange device in Embodiment 2 of the present invention, showing the hidden top wall.

[0036] Figure 6 This is a partial top view of the heat exchange device with its hidden top wall in Embodiment 3 of the present invention.

[0037] Explanation of key figure labels:

[0038] Cabinet 100; Shell 10; First side wall 11; Second side wall 12; Air inlet 13; Sub-air inlet 131; Air outlet 14; Heat exchange unit 20; Cooling fan 21; Heat exchange section 22; Liquid inlet section 23; Cooling section 24; Liquid outlet section 25; Connecting plate 26; First heat exchange section 27; Third heat exchange section 271; Second heat exchange section 28; Fourth heat exchange section 281; Total input terminal 01; Total output terminal 02; Coolant pipe 30; Liquid replenishment terminal 31; Coolant delivery component 40; Pump 41; Liquid replenishment component 50; Liquid replenishment port 51; Expansion cap 52; Electrical connector 60; Phase change heat pipe heat exchanger 200. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are preferred embodiments of the present invention and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0040] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and accompanying drawings of this invention is for distinguishing different objects and not for describing a specific order.

[0041] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this invention, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing the invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific scope of protection of this invention.

[0042] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this invention should be interpreted broadly to refer to any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection by other means or components.

[0043] In the claims, description and accompanying drawings of this invention, the terms "comprising," "having," and variations thereof are used to mean "including but not limited to."

[0044] In the claims and the description other than the embodiments, the terms "X-axis direction," "Y-axis direction," and "Z-axis direction" only refer to a feature having one of the aforementioned directions being perpendicular to a feature having another direction, and do not require that they be implemented according to the "X-axis direction," "Y-axis direction," and "Z-axis direction" described in the embodiments. In the embodiments, the X-axis direction is perpendicular to both the Y-axis direction and the Z-axis direction. The X-axis direction can be divided into left and right, the Y-axis direction into front and back, and the Z-axis direction into up and down.

[0045] Example 1

[0046] See Figure 1-5 , Figure 1-5 A centralized photovoltaic inverter is shown, including a cabinet 100 and a heat exchange device mounted on the top of the cabinet 100.

[0047] See Figure 1 The cabinet 100 is rectangular, with its length along the Y-axis greater than its length along the X-axis. A cavity for housing electrical components is formed within the cabinet 100. It is worth noting that the cavity primarily houses the inverter power module capable of DC / AC conversion, which includes semiconductor power devices such as IGBTs and generates significant heat during operation. In this embodiment, the heat exchange device, configured as a liquid-cooled unit, delivers coolant to the liquid-cooled plate within the cavity. This coolant carries away the heat from the IGBTs attached to the liquid-cooled plate and returns to the heat exchange section of the heat exchange device. Finally, a cooling fan blows away the heat from the coolant in the heat exchange section, achieving overall heat exchange.

[0048] In the specific structure, the projection of the heat exchange device along the Z-axis overlaps the projection of the cabinet 100 along the Z-axis. In this embodiment, the length of the heat exchange device is the same as the length of the cabinet 100, and the width of the heat exchange device is the same as the width of the cabinet 100, that is, the cabinet 100 and the shell 10 are sized to match. Since the length of the cabinet 100 along the Y-axis is greater than its length along the X-axis, when multiple centralized photovoltaic inverters are used together, the maintenance surfaces of the multiple centralized photovoltaic inverters are usually set on the shorter side, that is, the front and back perpendicular to the Y-axis, while the longer left and right sides perpendicular to the X-axis are used as the parallel cabinet surfaces. This allows the multiple centralized photovoltaic inverters to be arranged at intervals of several meters along the X-axis. Thus, the spacing between the centralized photovoltaic inverters only needs to meet the air intake requirements of two adjacent centralized photovoltaic inverters, which facilitates the arrangement of multiple centralized photovoltaic inverters. Specifically, the interval between multiple centralized photovoltaic inverters is usually no more than 10 meters.

[0049] See Figure 1-5 The heat exchange device includes a shell 10, two heat exchange units 20, a coolant pipe 30, a coolant conveying component 40, a coolant replenishment component 50, and an electrical connector 60.

[0050] The housing 10 is rectangular in shape, with first sidewalls 11 arranged parallel to each other along the horizontal X-axis and second sidewalls 12 arranged parallel to each other along the horizontal Y-axis. Each of the first sidewalls 11 has an air inlet 13, and each of the two second sidewalls 12 has an air outlet 14. In this embodiment, the length of the housing 10 along the Y-axis is greater than its length along the X-axis. The air inlet 13 includes two sub-air inlets 131.

[0051] Two heat exchange units 20 are symmetrically arranged in the housing 10 along the horizontal direction (Y-axis direction in this embodiment); each heat exchange unit 20 includes a heat exchange structure and a cooling fan 21; the two heat exchange structures are arranged along the Y-axis direction and form air outlet channels corresponding to two air outlets 14 respectively; each heat exchange structure includes two heat exchange parts 22 arranged along the X-axis direction, the two heat exchange parts 22 are at an angle to each other and form an open end; each heat exchange part 22 extends along the vertical Z-axis direction and is provided with a cooling part 24 and several air passages along the horizontal direction; the distance between the two heat exchange parts 22 gradually increases along the direction closer to their corresponding air outlets 14; each heat exchange part 22 Along its length direction, there are sequentially arranged a liquid inlet section 23, a cooling section 24, and a liquid outlet section 25. The liquid inlet section 23 has a liquid inlet end, and the liquid outlet section 25 has a liquid outlet end. The cooling section 24 is provided with alternating coolant flow channels and air passages along the Z-axis direction. The two ends of each coolant flow channel are connected to the liquid inlet section 23 and the liquid outlet section 25, respectively. Two cooling fans 21 are provided at the opening end and are respectively provided on the two first side walls (11) or the two second side walls (12), that is, corresponding to the two air inlets 13 or the two air outlets 14. They are used to drive the airflow from the air inlets 13 on both sides through the air passages of the four heat exchange sections 22 to the air outlets 14.

[0052] In this embodiment, two cooling fans 21 are respectively installed at two air outlets 14, and two heat exchange units 20 are arranged in the housing 10 along the Y-axis direction, with each heat exchange unit 20 corresponding to a sub-air inlet 131. Each heat exchange unit 20 also includes a connecting plate 26, which extends vertically and connects the ends of the two heat exchange parts 22 away from the cooling fans 21. In this embodiment, the cross-section of the connecting plate 26 is U-shaped, with its opening facing the cooling fans 21, and its two sides are respectively connected to the two heat exchange parts 22.

[0053] In this embodiment, the air outlet 14 discharges air horizontally, and the air passage of the heat exchange section 22 allows air to pass horizontally, making it difficult for sand and dust to enter the heat exchange device from the air outlet 14 and preventing sand accumulation. Compared to setting only one large heat exchange unit, the arrangement of two heat exchange units results in a larger heat exchange area and higher heat exchange efficiency. Since each pair of heat exchange sections is equipped with a cooling fan 21, and the two cooling fans 21 are respectively installed at the two air inlets 13 or the two air outlets 14, the diameter of the cooling fan 21 can be set according to the size of the air inlet 13 or the air outlet 14. The size of the air inlet 13 can be set according to the length of the shell along the Y-axis, and the size of the air outlet 14 can be set according to the length of the shell along the X-axis. This allows the cooling fan 21 to have a larger diameter, thereby having a larger air volume. Therefore, each heat exchange unit has a high heat dissipation efficiency.

[0054] In this embodiment, two cooling fans 21 are respectively installed at two air outlets 14, resulting in lower wind resistance and higher heat dissipation efficiency compared to installation at the air inlet 13. The air inlet 13 is located on the first sidewall 11, and the air outlet 14 is located on the second sidewall 12, thus creating a larger gap between the heat exchange unit 20 and the first sidewall 11. This gap allows for the placement of other parts of the heat exchange device, thereby modularizing the heat exchange device. The air inlet 13 includes sub-air inlets 131 corresponding to each heat exchange unit 20, ensuring that each heat exchange unit 20 has a large air intake in the X-axis direction, resulting in high heat dissipation efficiency.

[0055] In practical applications, each inlet end can be connected in parallel or series via coolant pipes 30 to form the supply end of the heat exchange unit 20, and each outlet end can be connected in parallel or series via coolant pipes 30 to form the return end of the heat exchange unit 20. That is, each heat exchange unit 20 has a supply end and a return end. The supply ends of two heat exchange units 20 are connected via coolant pipes 30 to form a total input end 01, and the return ends of two heat exchange units 20 are connected via coolant pipes 30 to form a total output end 02.

[0056] In this embodiment, two heat exchange units 20 are spaced apart along the Y-axis and both abut against the top wall of the housing 10. The spacing does not need to be too large, and the coolant pipe 30 passes through the spacing. This makes the installation of the coolant pipe 30 convenient. Compared to laying the coolant pipe 30 on the top of the heat exchange section 22 to connect the supply or return ends of the two heat exchange units 20, the heat exchange section 22 has a higher height along the Z-axis when the height of the housing 10 along the Z-axis is constant, thereby improving the heat exchange efficiency.

[0057] Coolant delivery component 40 is placed inside housing 10. Figure 2In the coolant delivery component 40, there are two pumps 41, which are located in two air outlet channels and connected to the main input end 01 and the main output end 02 through the coolant pipe 30. The pumps 41 drive the coolant to flow from the main input end 01 to the main output end 02. The coolant pipe 30 passes through the connecting plate 26. The air outlet channel here is the area enclosed by the two heat exchange parts 22, the connecting plate 26 and the cooling fan 21. This arrangement improves the coolant delivery efficiency and the space utilization within the housing 10.

[0058] See also Figure 2 One of the two heat exchange sections 22 is defined as a first heat exchange section 27, and the other as a second heat exchange section 28. The first heat exchange section 27 is parallel to the Y-axis and forms a first gap with the first sidewall 11. The second heat exchange section 28 is inclined with respect to both the X-axis and Y-axis directions. The two first heat exchange sections 27 are far apart from each other along the X-axis. The total input terminal 01 and the total output terminal 02 are located within one of the first gaps and close to the second sidewall 12. This arrangement makes the external coolant pipes 30 of the entire heat exchange device more concentrated, facilitating connection to other heat-generating components and simplifying installation and maintenance. Furthermore, because the airflow reversal angle of the first heat exchange section 27 is larger than that of the second heat exchange section 28, the air resistance of the first heat exchange section 27 is also greater than that of the second heat exchange section 28. This arrangement, however, results in the second heat exchange section 28 being longer than the first heat exchange section 27, effectively balancing the airflow efficiency of the two heat exchange sections 27 and 28, thus ensuring adequate airflow in the angled area of ​​the heat exchange units 20. The two first heat exchange sections 27 are further apart along the X-axis, resulting in a larger interval between the two heat exchange units 20 along the Y-axis, further facilitating the installation of the coolant pipes 30.

[0059] The fluid replenishment component 50 is located within one of the first intervals. In this embodiment, the fluid replenishment component 50 is located within the same first interval as the total input terminal 01 and the total output terminal 02. See also Figure 3The coolant pipe 30 has a replenishment end 31 within the first interval where the replenishment component 50 is located. The replenishment component 50 has a replenishment port 51 communicating with the replenishment end 31, and the replenishment port 51 is higher than the replenishment end 31. The top of the replenishment component 50 has an expansion cap 52, and the expansion cap 52 has a pressure relief valve. The pressure relief valve is prior art and will not be described in detail in this embodiment. The distance between the highest water level of the liquid in the replenishment component 50 and the top wall of the replenishment component 50 is greater than a first value. This facilitates the maintenance of the replenishment component 50. The replenishment port 51 of the replenishment component 50 is higher than the replenishment end 31, so that the replenishment component 50 is located at the highest position of the liquid path, thereby realizing the automatic replenishment function to the replenishment end 31 under the action of gravity, which is simple to operate. The replenishing component 50 is equipped with an expansion cap 52, which has a pressure relief valve. The distance between the highest liquid level in the replenishing component 50 and the top wall of the replenishing component 50 is greater than a first value. Therefore, when the pressure in the coolant pipe 30 is high, the pressure in the coolant pipe 30 can flow to the replenishing component 50, causing the liquid level in the replenishing component 50 to rise and compress the gas above the liquid, thus opening the pressure relief valve on the expansion cap 52. In other words, the pressure relief valve on the expansion cap 52 can relieve the pressure in the coolant pipe 30, preventing the pressure in the coolant pipe 30 from becoming too high. When the pressure in the coolant pipe 30 is low, the replenishing component 50 can replenish liquid to the replenishing position under the action of gravity. Thus, the replenishing component 50 integrates the functions of a replenishing water tank and an expansion tank, ensuring that the coolant pipe 30 operates under a relatively stable pressure. Therefore, there is no need to install an expansion tank in the heat exchange device, reducing the volume of the heat exchange device and making the structure of the heat exchange device compact and simple.

[0060] See Figure 2 and Figure 4 The electrical connector 60 is used to connect the heat exchanger to an external electrical source, and it is located near the second sidewall 12 within another first compartment. Placing the electrical connector 60 within the first compartment, compared to placing it around external electrical connectors, is more beneficial for protecting the connector and facilitates maintenance and operation. Furthermore, the placement of the electrical connector 60 near the second sidewall 12 within another first compartment, along with the liquid replenishment component 50, the main input terminal 01, and the main output terminal 02, within the same first compartment, achieves water and electricity separation as much as possible and facilitates modular electrical wiring.

[0061] When the centralized photovoltaic inverter of this application is connected in a cabinet along the X-axis, the hot air outlet direction is the Y-axis, which makes it less likely for hot airflow to short-circuit and eliminates the need for mirror settings to prevent hot airflow short-circuit.

[0062] Example 2

[0063] Example 2 is basically the same as Example 1, except that, see [link to example]. Figure 5The first heat exchange section 27 is formed by at least two third heat exchange sections 271 attached together along its thickness direction, and the second heat exchange section 28 is formed by at least two fourth heat exchange sections 281 attached together along its thickness direction. Each third heat exchange section 271 and each fourth heat exchange section 281 is provided with a liquid inlet section 23, a cooling section 24 and a liquid outlet section 25 arranged sequentially along its length direction. The cooling section 24 is provided with alternating coolant flow channels and air passages along the Z-axis direction. The liquid inlet section 23 is provided with a liquid inlet end, and the liquid outlet section 25 is provided with a liquid outlet end. The liquid inlet sections 23 of two adjacent third heat exchange sections 271 are far apart from each other so that each third heat exchange section 271 is connected in series. The liquid inlet sections 23 of two adjacent fourth heat exchange sections 281 are far apart from each other so that each fourth heat exchange section 281 is connected in series. Figure 5 The first heat exchange section 27 includes two third heat exchange sections 271, and the second heat exchange section 28 includes two fourth heat exchange sections 281. The liquid inlet ends of the first heat exchange section 27 and the second heat exchange section 28 are connected in parallel to form the liquid supply end of the heat exchange unit 20, and the liquid outlet ends of the first heat exchange section 27 and the second heat exchange section 28 are connected in parallel to form the liquid return end of the heat exchange unit 20. The liquid supply ends of the two heat exchange units 20 are connected in parallel to form the total input end 01, and the liquid return ends are connected in parallel to form the total output end 02.

[0064] The above configuration allows for adjustment of the thickness of the first heat exchange section 27 according to heat dissipation requirements, resulting in a wider range of applications and lower costs. The liquid inlet sections 23 of two adjacent third heat exchange sections 271 are spaced far apart to connect them in series, and the liquid inlet sections 23 of two adjacent fourth heat exchange sections 281 are also spaced far apart to connect them in series, making the laying of the coolant pipes 30 more convenient. The liquid inlet ends of the first heat exchange section 27 and the second heat exchange section 28 are connected in parallel to form the liquid supply end of the heat exchange unit 20, and the liquid outlet ends of the first heat exchange section 27 and the second heat exchange section 28 are connected in parallel to form the liquid return end of the heat exchange unit 20. The liquid supply ends of the two heat exchange units 20 are connected in parallel to form the total input end 01, and the liquid return ends are connected in parallel to form the total output end 02. This results in low flow resistance and consistent pipe temperature rise, thereby reducing the power of the pump 41.

[0065] Example 3

[0066] Example 3 has a structure that is basically the same as that of Example 1, except that, see [link to example]. Figure 6 In Embodiment 3, the two heat exchange sections 22 have the same length and are both inclined relative to the X-axis and Y-axis directions. The liquid replenishment component 50 and the electrical connector 60 are respectively placed within the gap between the heat exchange unit 20 and the first sidewall 11. This arrangement facilitates the processing of the heat exchange section 22 and the installation of the heat exchange unit 20. Furthermore, it results in a larger heat exchange area, higher heat exchange efficiency, and higher heat dissipation efficiency.

[0067] Preferably, the centralized photovoltaic inverter of Embodiment 3 further includes a phase change heat pipe heat exchanger 200, which has a cold side and a hot side, the hot side extending into the cabinet. The cold side extends into the housing 10 and is disposed near one of the first sidewalls 11, so as to dissipate heat from the airflow inside the cabinet by using the cold air entering the corresponding air inlet 13. Of course, the phase change heat pipe heat exchanger can also be provided in other embodiments.

[0068] Example 4

[0069] Example 4 also provides a photovoltaic power station including at least two centralized photovoltaic inverters as described in the preceding examples, wherein the at least two centralized photovoltaic inverters are arranged at a distance of D meters along the X-axis direction; where D is less than 10. The photovoltaic power station includes multiple centralized photovoltaic inverters arranged in parallel cabinets at intervals of several meters. Due to the above-mentioned structural design of the centralized photovoltaic inverters, the photovoltaic power station can better avoid the problem of airflow interference between them.

[0070] The foregoing description of the specifications and embodiments is intended to explain the scope of protection of this invention, but does not constitute a limitation on the scope of protection of this invention. Modifications, equivalent substitutions, or other improvements to the embodiments of this invention or a portion thereof that can be obtained by those skilled in the art through logical analysis, reasoning, or limited experimentation, based on the teachings of this invention or the foregoing embodiments, in conjunction with common knowledge, general technical knowledge, and / or existing technology, should all be included within the scope of protection of this invention.

Claims

1. A centralized photovoltaic inverter, characterized in that, Includes a cabinet (100) and a heat exchange device fixed to the cabinet (100); the cabinet has a parallel surface perpendicular to the horizontal X-axis direction; the heat exchange device includes: The housing (10) has first sidewalls (11) arranged parallel to each other along the X-axis and second sidewalls (12) arranged parallel to each other along the horizontal Y-axis. Both first sidewalls (11) have air inlets (13), and both second sidewalls (12) have air outlets (14). Two heat exchange units (20) are symmetrically arranged in the housing (10) along the horizontal direction. Each heat exchange unit (20) includes a heat exchange structure and a cooling fan (21). The heat exchange structure includes two heat exchange sections (22) that are angled to each other to form an open end. Each heat exchange section (22) extends along the vertical Z-axis and is provided with a cooling section (24) and several air passages along the horizontal direction. The cooling fan (21) is provided corresponding to the open end of the heat exchange structure. The two cooling fans (21) are respectively arranged opposite to each other on the two first sidewalls (11) or the two second sidewalls (12) to drive the airflow from the air inlet (13) through the air passages of each heat exchange section (22) to the air outlet (14).

2. A centralized photovoltaic inverter as described in claim 1, characterized in that, The heat exchange device is placed on top of the cabinet (100). The cabinet (100) and the shell (10) are sized to match, and their lengths along the Y-axis are both greater than their lengths along the X-axis.

3. A centralized photovoltaic inverter as described in claim 2, characterized in that, The heat exchange device also includes a coolant pipe (30); two cooling fans (21) are respectively installed at the two second side walls (12); two heat exchange units (20) are arranged at intervals along the Y-axis and both abut against the top wall of the shell (10); each heat exchange unit (20) is provided with a liquid supply end and a liquid return end, the liquid supply ends of the two heat exchange units (20) are connected through the coolant pipe (30) to form a total input end (01), and the liquid return ends of the two heat exchange units (20) are connected through the coolant pipe (30) to form a total output end (02); the coolant pipe (30) passes through the gap between the two heat exchange units (20).

4. A centralized photovoltaic inverter as described in claim 3, characterized in that, a definition is provided. One of the two heat exchange sections (22) is a first heat exchange section (27) and the other is a second heat exchange section (28). The first heat exchange section (27) is parallel to the Y-axis direction and forms a first gap with the first sidewall (11). The second heat exchange section (28) is inclined relative to both the X-axis direction and the Y-axis direction. The total input terminal (01) and the total output terminal (02) are both located in one of the first gaps and close to the second sidewall (12).

5. A centralized photovoltaic inverter as described in claim 4, characterized in that, The two first heat exchange sections (27) are far apart from each other along the X-axis; the air inlet (13) includes a sub-air inlet (131) corresponding to each heat exchange unit (20).

6. A centralized photovoltaic inverter as described in claim 4, characterized in that, Each heat exchange structure also includes a connecting plate (26) that extends vertically and connects the two heat exchange sections (22) away from the end of the cooling fan (21); The heat exchange device also includes a coolant delivery component (40) and an electrical connection component (60) located within the housing (10); The coolant delivery component (40) includes two pumps (41); the two pumps (41) are located in two air outlet channels respectively and are connected to the main input end (01) and the main output end (02) through the coolant pipe (30), driving the coolant to flow from the main input end (01) to the main output end (02); the coolant pipe (30) passes through the connecting plate (26); The electrical connector (60) is used to realize the electrical connection between the heat exchange device and the cabinet, and it is placed in another first interval near the second side wall (12).

7. A centralized photovoltaic inverter as described in claim 6, characterized in that, The heat exchange device further includes a liquid replenishment component (50) located in the same first interval as the total input end (01) and the total output end (02). The coolant pipe (30) is provided with a liquid replenishment end (31) in the first interval where the liquid replenishment component (50) is located. The liquid replenishment component (50) is provided with a liquid replenishment port (51) communicating with the liquid replenishment end (31). The liquid replenishment port (51) is higher than the liquid replenishment end (31). The top of the liquid replenishment component (50) is provided with an expansion cap (52). The expansion cap (52) is provided with a pressure relief valve. The distance between the highest water level of the liquid in the liquid replenishment component (50) and the top wall of the liquid replenishment component (50) is greater than a first value.

8. A centralized photovoltaic inverter as described in claim 7, characterized in that, The first heat exchange section (27) is formed by at least two third heat exchange sections (271) attached along its thickness direction, and the second heat exchange section (28) is formed by at least two fourth heat exchange sections (281) attached along its thickness direction. Each third heat exchange section (271) and each fourth heat exchange section (281) is provided with an inlet section (23), a section to be cooled (24), and an outlet section (25) in sequence along its length. The section to be cooled (24) is provided with alternating coolant flow channels and air passages along the Z-axis. The inlet section (23) is provided with an inlet end, and the outlet section (25) is provided with an outlet end. The inlet sections (23) of two adjacent third heat exchange sections (271) are far apart from each other so that each third heat exchange section (271) is connected in series. The liquid inlet (23) of each fourth heat exchange section (281) is far apart from each other so that each fourth heat exchange section (281) is connected in series; the liquid inlet ends of the first heat exchange section (27) and the second heat exchange section (28) are connected in parallel to form the liquid supply end of the heat exchange unit (20), and the liquid outlet ends of the first heat exchange section (27) and the second heat exchange section (28) are connected in parallel to form the liquid return end of the heat exchange unit (20); the liquid supply ends of the two heat exchange units (20) are connected in parallel to form the total input end (01), and the liquid return ends are connected in parallel to form the total output end (02).

9. A centralized photovoltaic inverter as described in any one of claims 1-8, characterized in that, The centralized photovoltaic inverter also includes a phase change heat pipe heat exchanger; the phase change heat pipe heat exchanger has a cold side and a hot side, the hot side extending into the cabinet (100); the cold side extending into the housing (10) and located near one of the first side walls (11) to dissipate heat from the airflow inside the cabinet by using the cold air entering the corresponding air inlet (13).

10. A photovoltaic power station, characterized in that, It includes at least two centralized photovoltaic inverters as described in any one of claims 1-9; the at least two centralized photovoltaic inverters are arranged at a distance of D meters along the X-axis direction; where D is less than 10.

Images