Power conversion device

Abstract

The embodiment of the invention provides power conversion equipment, and relates to the technical field of energy. The power conversion equipment comprises a shell, a power module and a radiator, the radiator comprises a substrate, a radiating pipe, a first protective plate and a liquid injection pipe; a gas-liquid channel is arranged in the base plate, a cooling working medium for gas-liquid conversion is arranged in the gas-liquid channel, the radiating pipe is fixed on one plate surface of the base plate, and an internal channel of the radiating pipe is communicated with the gas-liquid channel; the shell is provided with a mounting opening, the substrate and the heat dissipation pipe are both located outside the shell, the power module penetrates through the mounting opening to make contact with the plate face, away from the heat dissipation pipe, of the substrate, or the substrate is located in the shell and makes contact with the power module, and the heat dissipation pipe penetrates through the mounting opening to stretch out of the shell; the first protection plate and the heat dissipation pipe are arranged in the first direction, and the first direction is perpendicular to the thickness direction of the base plate; an internal channel of the liquid injection pipe communicates with the gas-liquid channel, and at least part of the liquid injection pipe is located between the first protection plate and the heat dissipation pipe. According to the technical scheme, the possibility that the liquid injection pipe is damaged can be reduced.

Description

Technical Field

[0001] The present application relates to the field of energy technology, and in particular to a power conversion device. Background Art

[0002] In recent years, the demand for heat dissipation of power conversion equipment has increased dramatically. In order to solve the heat dissipation of power modules inside power conversion equipment, two-phase radiators have received more and more attention. Among them, a two-phase radiator is a radiator that uses phase change of working fluid to achieve efficient heat dissipation. Since two-phase working fluid needs to be injected into the radiator, a liquid injection pipe needs to be reserved, and after the injection is completed, the liquid injection pipe needs to be sealed.

[0003] In the related art, in order to facilitate liquid injection, the liquid injection pipe is usually arranged close to the outer side of the radiator. During the installation and transportation of the radiator, the liquid injection pipe may be damaged due to collision. Summary of the invention

[0004] The present application provides a power conversion device, which can reduce the possibility of damage to a liquid injection pipe during the installation and transportation of the radiator and extend the life of the radiator.

[0005] In order to achieve the above objectives, this application adopts the following technical solutions:

[0006] The present application provides a power conversion device, which includes a shell, a power module and a radiator. The shell is used to accommodate the power module, and the power module is used to convert direct current from a photovoltaic module or an energy storage battery into alternating current; the radiator includes a substrate, a heat dissipation pipe, a first protective plate and a liquid injection pipe; the substrate is fixed to the shell, and has a gas-liquid channel in the substrate, and has a cooling medium for gas-liquid conversion in the gas-liquid channel, the heat dissipation pipe is fixed to one of the board surfaces of the substrate, and the internal channel of the heat dissipation pipe is connected to the gas-liquid channel; the shell has a mounting port, the substrate and the heat dissipation pipe are both located outside the shell, the power module passes through the mounting port and contacts with the board surface of the substrate away from the heat dissipation pipe, or the substrate is located in the shell and contacts the power module, and the heat dissipation pipe extends out of the shell through the mounting port; the first protective plate and the heat dissipation pipe are fixed to the same board surface of the substrate, the first protective plate and the heat dissipation pipe are arranged along a first direction, and the first direction is perpendicular to the thickness direction of the substrate; one end of the liquid injection pipe is fixed to the substrate, the internal channel of the liquid injection pipe is connected to the gas-liquid channel, and the liquid injection pipe is at least partially located between the first protective plate and the heat dissipation pipe.

[0007] The power module is a device that generates more heat in the power conversion equipment. The radiator dissipates heat for the power module to make the heat dissipation efficiency of the power conversion equipment higher. The heat dissipation principle of the radiator is that the liquid cooling medium accumulates in the substrate. Under the heating of the power module, the liquid cooling medium will become gaseous, and at least part of the gaseous cooling medium will flow into the heat dissipation pipe. Since the heat dissipation pipe is located outside the shell as a whole or in part, the heat dissipation pipe can exchange heat with the air outside the shell. After cooling, the gaseous cooling medium in the heat dissipation pipe will turn into liquid cooling medium again. At least part of the liquid cooling medium will flow back to the substrate, and then continue to absorb the heat of the power module, and then turn into gaseous cooling medium again, and then dissipate heat in the heat dissipation pipe, so as to achieve uninterrupted heat dissipation of the power module. Since the cooling medium needs to be injected into the substrate from the outside, an injection pipe is connected to the substrate, and the cooling medium can be injected into the gas-liquid channel of the substrate through the injection pipe. At least a portion of the liquid injection pipe is arranged between the first protective plate and the heat dissipation pipe, so that the liquid injection pipe can be protected by the first protective plate, thereby reducing the possibility of damage to the liquid injection pipe during the installation and transportation of the radiator.

[0008] In an optional implementation, the liquid injection pipe is located between the first protective plate and the heat dissipation pipe, and the first protective plate has an opening, and the opening penetrates the first protective plate along a first direction.

[0009] In the case where it is necessary to inject liquid into the substrate through the injection tube, the injection tube can be pulled out from between the first guard plate and the heat dissipation tube. The pulled-out injection tube can pass through the opening and extend to the side of the first guard plate away from the heat dissipation tube, or the initially installed injection tube has a portion extending to the side of the first guard plate away from the heat dissipation tube. By injecting liquid into the injection tube, the cooling medium (cooling medium capable of gas-liquid conversion) can be injected into the gas-liquid channel of the substrate. After the injection is completed, the port of the injection tube is blocked, and then the injection tube is readjusted to between the first guard plate and the heat dissipation tube, thereby completing the injection operation of the radiator. The injection tube located between the first guard plate and the heat dissipation tube is less at risk of damage under the protection of the first guard plate.

[0010] In an optional embodiment, in the first direction, the opening is directly opposite to the injection tube.

[0011] Since the opening is directly opposite to the injection tube, after the operation of injecting liquid into the substrate through the injection tube is completed, it is convenient to adjust the injection tube to between the first guard plate and the heat dissipation tube, thereby reducing the difficulty of bending the injection tube.

[0012] In an optional embodiment, the distance between the edge of the opening facing away from the substrate and the substrate is greater than the distance between the end of the injection tube facing away from the substrate and the substrate.

[0013] In some cases, the injection tube is a harder tube (for example, a metal tube) and has poor flexibility. In this case, the edge of the opening facing away from the substrate is farther away from the substrate than the end of the injection tube. This helps to retract the injection tube from the opening to between the first guard plate and the heat dissipation tube, thereby reducing the possibility of the first guard plate interfering with the movement of the injection tube.

[0014] In an optional implementation, the radiator further includes a baffle, which is fixed to the first protective plate and is used to block the opening.

[0015] After the injection pipe is adjusted to between the first guard plate and the heat dissipation pipe, the baffle is installed on the first guard plate, and the opening on the first guard plate is blocked by the baffle to seal the opening. The cooperation of the baffle and the first guard plate further protects the injection pipe, reducing the possibility of damage to the injection pipe.

[0016] In an optional embodiment, the first protective plate has an opening that penetrates the first protective plate along a first direction, a portion of the injection tube is located between the first protective plate and the heat dissipation tube, and another portion of the injection tube extends through the opening to a side of the first protective plate away from the injection tube.

[0017] That is, the injection tube always passes through the opening and extends to the side of the first guard plate away from the heat dissipation tube. By injecting liquid into the injection tube, the cooling medium (cooling medium capable of gas-liquid conversion) can be injected into the gas-liquid channel of the substrate. After the injection is completed, the tube mouth of the injection tube is blocked without the need to readjust the injection tube to between the first guard plate and the heat dissipation tube, thereby reducing the processing steps and improving production efficiency. In the above case, a part of the injection tube is located between the first guard plate and the heat dissipation tube. Under the protection of the first guard plate, the possibility of damage to the injection tube can also be reduced.

[0018] In an optional embodiment, the radiator also includes a protective cover, which is fixed to the first protective plate. The protective cover is at least partially located on the side of the first protective plate away from the heat dissipation pipe, and the part of the injection pipe extending to the side of the first protective plate away from the injection pipe is located inside the protective cover.

[0019] After the liquid injection is completed, the pipe opening of the liquid injection pipe is blocked, and the protective cover is installed on the first protective plate, and the portion of the liquid injection pipe located on the side of the first protective plate away from the heat dissipation pipe is protected by the protective cover. In this way, the portion of the liquid injection pipe located between the first protective plate and the heat dissipation pipe is protected by the first protective plate, and the portion of the liquid injection pipe located on the side of the first protective plate away from the heat dissipation pipe is protected by the protective cover. With the cooperation of the first protective plate and the protective cover, the risk of damage to the liquid injection pipe is further reduced.

[0020] In an optional embodiment, the first guard plate has two edges opposite to each other in the second direction, and the first direction, the second direction and the thickness direction of the substrate are perpendicular to each other; the opening extends to one of the edges of the first guard plate, and of the two edges of the first guard plate, the injection tube is closer to the edge where the opening is provided.

[0021] The opening extends to one edge of the first guard plate in the second direction, that is, one edge of the first guard plate is penetrated by the opening, which facilitates the installation of the first guard plate on the outside of the injection tube. In addition, when the injection tube needs to be adjusted between the first guard plate and the heat dissipation tube, the opening penetrates the edge of the first guard plate, so that the injection tube can also be twisted between the first guard plate and the heat dissipation tube through the edge of the first guard plate penetrated by the opening, making the twisting or bending of the injection tube more convenient.

[0022] In an optional embodiment, the radiator further includes a first fin, the first fin is fixed between the first guard plate and the heat dissipation pipe, and the first fin avoids the liquid injection pipe.

[0023] The first fin can assist the heat dissipation of the heat pipe. After the heat is transferred to the heat pipe and the first guard plate, the heat on the heat pipe and the first guard plate can also be transferred to the first fin, and heat is exchanged with the outside air through the first fin, further improving the heat dissipation efficiency of the radiator. In addition, the first fin avoids the injection pipe, which can reduce the possibility of interference between the first fin and the injection pipe, which is conducive to the assembly of the radiator.

[0024] In an optional embodiment, the heat dissipation pipe includes a plurality of heat dissipation sub-tubes and a plurality of second fins, the plurality of heat dissipation sub-tubes are arranged along a first direction, a gap is provided between two adjacent heat dissipation sub-tubes, and a plurality of second fins are fixed between at least two adjacent heat dissipation sub-tubes.

[0025] The gaps between the plurality of heat dissipating sub-tubes enable sufficient heat exchange between the heat dissipating sub-tubes and the air. In addition, the second fins can assist the heat dissipating sub-tubes in heat dissipation. After the heat is transferred to the heat dissipating sub-tubes, the heat on the heat dissipating sub-tubes can be transferred to the second fins and exchange heat with the outside air through the second fins, thereby further improving the heat dissipation efficiency of the radiator.

[0026] In an optional embodiment, the radiator further includes a second guard plate, and the second guard plate and the first guard plate are fixed on the same plate surface of the substrate, and in the first direction, the heat dissipation pipe is located between the first guard plate and the second guard plate.

[0027] The first guard plate and the second guard plate are located on both sides of the heat dissipation pipe, and jointly protect the heat dissipation pipe, thereby reducing the possibility of damage to the heat dissipation pipe. In addition, when the heat dissipation pipe is protected, the first guard plate can also provide protection for the injection pipe.

[0028] In an optional embodiment, the radiator further includes a busbar, the heat dissipation tube is located between the substrate and the busbar, a busbar has a busbar cavity therein, and the busbar cavity is connected to an internal channel of the heat dissipation tube.

[0029] The manifold can be a hollow plate-like structure, one end of the heat dissipation tube is connected to the gas-liquid channel, and the other end is connected to the manifold cavity. The gaseous cooling medium in the heat dissipation tube can flow into the manifold and become a liquid cooling medium in the manifold. In addition, the gaseous cooling medium in the heat dissipation tube can also flow into the manifold after becoming a liquid, and the liquid cooling medium in the manifold will accumulate at the bottom of the manifold and then flow back from the heat dissipation tube to the substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of the structure of a photovoltaic system provided in an embodiment of the present application;

[0031] Figure 2 A schematic diagram of the external structure of a power conversion device provided in an embodiment of the present application;

[0032] Figure 3 A schematic diagram of the internal structure of a power conversion device provided in an embodiment of the present application;

[0033] Figure 4 A schematic diagram of a disassembled structure of a power conversion device provided in an embodiment of the present application;

[0034] Figure 5 A schematic diagram of the internal structure of another power conversion device provided in an embodiment of the present application;

[0035] Figure 6 A schematic diagram of the structure of a radiator provided in an embodiment of the present application;

[0036] Figure 7 A position relationship diagram of a power module and a heat sink provided in an embodiment of the present application;

[0037] Figure 8 A schematic diagram of the structure of a liquid injection tube provided in an embodiment of the present application;

[0038] Fig. 9 A position relationship diagram of a liquid injection pipe and a heat dissipation pipe provided in an embodiment of the present application;

[0039] Fig.10 A schematic diagram of the structure of an opening provided in an embodiment of the present application;

[0040] Fig.11 A schematic diagram of the structure of a baffle provided in an embodiment of the present application;

[0041] Fig.12A schematic diagram of the structure of a card slot provided in an embodiment of the present application;

[0042] Fig.13 A schematic diagram of the structure of another liquid injection tube provided in an embodiment of the present application;

[0043] Fig.14 A schematic diagram of the structure of a protective cover provided in an embodiment of the present application;

[0044] Fig.15 A schematic diagram of the structure of a second guard plate provided in an embodiment of the present application;

[0045] Fig.16 A schematic diagram of the structure of a first fin provided in an embodiment of the present application;

[0046] Fig.17 A position relationship diagram of a first fin and a liquid injection pipe provided in an embodiment of the present application;

[0047] Fig.18 A schematic diagram of the internal structure of another power conversion device provided in an embodiment of the present application.

[0048] Reference numerals:

[0049] 100-PV system; 101-power conversion equipment; 102-PV module; 103-switch box; 104-box substation; 105-grid; 1-housing; 11-installation port; 12-air inlet; 13-air outlet; 2-power module; 3-circuit board; 31-other electronic components; 32-inductor; 4-heat exchanger; 5-radiator; 51-substrate; 511-gas-liquid channel; 512-cooling Cooling medium; 52-heating pipe; 521-heating sub-tube; 5211-flow channel; 522-second fin; 53-conveyor plate; 531-conveyor chamber; 54-first guard plate; 541-opening; 55-liquid injection pipe; 56-baffle; 561-slot; 57-protective cover; 58-second guard plate; 59-first fin; 50-third fin; 6-blowing structure; 7-heating cover; 71-air inlet; 72-air outlet. DETAILED DESCRIPTION

[0050] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0051] In the drawings of the embodiments of the present application, solid structures such as components and assemblies are represented by guide lines; hollow structures such as openings, holes, spaces, and cavities are represented by guide lines with arrows.

[0052] The embodiment of the present application provides a power conversion device 101. In an example, the power conversion device 101 may be an inverter. In this example, the power conversion device 101 is used in a photovoltaic system 100. Figure 1 The structure of a photovoltaic system 100 is shown as an example. Figure 1 The photovoltaic module 102 directly converts solar energy into electrical energy using the photovoltaic effect, wherein the photovoltaic module 102 generally includes multiple (the multiple in this application refers to two or more) solar cells connected in series or in parallel to achieve a certain rated output power and voltage. The power conversion device 101 (for example, a photovoltaic inverter) is used to convert the direct current from the photovoltaic module 102 into alternating current, which is then sent to the box-type substation 104 for voltage transformation after passing through the switch box 103 for controlling the on and off, and then output to the power grid 105 or other loads.

[0053] In another example, the power conversion device 101 may be a power conversion system (PCS). In this example (not shown in the drawings), the power conversion device 101 is used in an energy storage system, and the DC source of the power conversion device 101 includes an energy storage battery. The power conversion device 101 is used to convert the DC power from the energy storage battery into AC power and output it to the power grid 105 or other loads. In addition, the power conversion device 101 (energy storage converter) can also convert the AC power of the power grid 105 into DC power to charge the energy storage battery.

[0054] Figure 2 The external structure of a power conversion device 101 is shown as an example. Figure 3 The example shows Figure 2 The internal structure of the power conversion device 101 is shown in FIG. Figure 2 and Figure 3 The power conversion device 101 includes a housing 1, a circuit board 3 and a power module 2. The housing 1 has a space for placing devices and apparatuses. The circuit board 3 may be a printed circuit board (PCB). The circuit board 3 is fixed in the inner space of the housing 1. The power module 2 is used to convert direct current from the photovoltaic module 102 or the energy storage battery into alternating current. The power module 2 is located in the housing 1 and fixed on the circuit board 3. That is, the circuit board 3 and the power module 2 are both located in the housing 1.

[0055] In some examples, the power module 2 is provided with one, and in other examples, the power module 2 is provided with multiple, Figure 3 A power module 2 on a circuit board 3 is shown in the figure, and the subsequent description is carried out by taking the power module 2 as an example.

[0056] In addition, in addition to the power module 2, other electronic components 31 (capacitors, inductors, etc.) may also be arranged on the circuit board 3, for example, Figure 3 In some examples, the other electronic components 31 mentioned above can be arranged on different surfaces of the circuit board 3 from the power module 2, for example, referring to Figure 3 , the power module 2 is arranged on one of the surfaces of the circuit board 3, and the other electronic components 31 are arranged on the other surface of the circuit board 3. In other examples, the other electronic components 31 can be arranged on the same surface of the circuit board 3 as the power module 2. In other examples, a part of the other electronic components 31 is arranged on the same surface of the circuit board 3 as the power module 2, and another part of the other electronic components is arranged on a different surface of the circuit board 3 as the power module 2, and the present application does not impose any specific limitation on this.

[0057] In some examples, electronic components that generate relatively high heat, such as the inductor 32, can be arranged outside the housing 1 and fixed to the housing 1, so that the electronic components that generate relatively high heat can dissipate heat outside the housing 1, and the electronic components outside the housing 1 (for example, the attached Figure 3 The inductor 32 in the circuit board 3 is electrically connected to the circuit board 3 through a lead (not shown in the drawings).

[0058] In order to cool down the inside of the shell 1 , in some examples, the power conversion device 101 further includes a heat exchanger 4 , which is disposed outside the shell 1 and fixed on the side wall of the shell 1 , and has a heat exchange channel inside the heat exchanger 4 . Figure 4 The schematic diagram of the split structure of a power conversion device 101 is shown as an example. Figure 4 The housing 1 is provided with an air inlet 12 and an air outlet 13. One end of the heat exchange channel of the heat exchanger 4 is connected to the air inlet 12, and the other end is connected to the air outlet 13. A driving member (for example, a fan or blower) may also be provided in the housing 1. The driving member is not shown in the drawings of the present application. The air in the housing 1 can be sent from the air inlet 12 into the heat exchanger 4 through the driving member, and heat is exchanged with the air outside the housing 1 in the heat exchanger 4, and then discharged from the air outlet 13 and returned to the housing 1 to achieve cooling in the housing 1. In some other examples, the power conversion device 101 may also not include the heat exchanger 4.

[0059] In addition, the power module 2 is a device that generates relatively serious heat in the power conversion device 101. Figure 3 and Figure 4The power conversion device 101 also includes a radiator 5, which can dissipate heat for the power module 2 in a targeted manner, so that the heat dissipation efficiency of the power conversion device 101 is higher. In the case where the power conversion device 101 also includes a heat exchanger 4, the heat exchanger 4 and the radiator 5 are staggered in the second direction. In order to enable the radiator 5 to contact the power module 2, a mounting port 11 is provided on the housing 1, and the power module 2 is located on the board surface of the circuit board 3 facing the mounting port 11.

[0060] In one example, referring to Figure 3 , the heat sink 5 is located outside the housing 1, and the power module 2 contacts the heat sink 5 through the mounting opening 11 (or is fixedly connected to the heat sink 5). It should be noted that in this example, the power module 2 is also arranged in the housing 1. For example, the heat sink 5 is close to the side wall of the housing 1 where the mounting opening 11 is arranged, and the heat sink 5 blocks the mounting opening 11. The power module 2 passing through the mounting opening 11 does not mean that the power module 2 extends out of the housing 1 through the mounting opening 11, but means that the power module 2 extends to the mounting opening 11, and the contact position between the power module 2 and the heat sink 5 is located at the mounting opening 11.

[0061] Reference Figure 3 and Figure 4 The radiator 5 includes a substrate 51 and a heat dissipation pipe 52. Both the substrate 51 and the heat dissipation pipe 52 are located outside the shell 1. The substrate 51 is fixed on the shell 1 and blocks the mounting port 11. The power module 2 is in contact with or connected to the substrate 51. The heat dissipation pipe 52 is fixed on the surface of the substrate 51 that is away from the power module 2.

[0062] In some other examples, a portion of the heat sink 5 may be located inside the housing 1 and in contact with the power module 2, and another portion may extend outside the housing 1. For example, Figure 5 The internal structure of another power conversion device 101 is shown as an example. Figure 5 The substrate 51 is located in the housing 1 and contacts the power module 2 , and the heat dissipation pipe 52 extends out of the housing 1 through the mounting opening 11 .

[0063] Figure 6 The structure of a heat sink 5 is shown as an example. Figure 6 The substrate 51 may be a hollow plate-like structure, and the substrate 51 has a gas-liquid channel 511 in it, and the gas-liquid channel 511 has a cooling medium 512 for gas-liquid conversion, and the heat dissipation pipe 52 is fixed on one of the plate surfaces of the substrate 51, and the internal channel of the heat dissipation pipe 52 is connected to the gas-liquid channel 511. Figure 6In the example shown, the heat pipe 52 includes a plurality of heat dissipation sub-tubes 521, and the plurality of heat dissipation sub-tubes 521 are arranged along a first direction, wherein the first direction is perpendicular to the thickness direction (third direction) of the substrate 51, and each heat dissipation sub-tube 521 is a flat tube, and each heat dissipation sub-tube 521 has a plurality of flow channels 5211, and each flow channel 5211 is connected to the gas-liquid channel 511, that is, the internal channel of the heat dissipation pipe 52 includes the plurality of flow channels 5211 of each heat dissipation sub-tube 521, or in other words, the plurality of flow channels 5211 of the plurality of heat dissipation sub-tubes 521 together constitute the internal channel of the heat dissipation pipe 52.

[0064] exist Figure 6 In the example shown, each heat dissipation sub-tube 521 is a micro-channel flat tube (the heat dissipation sub-tube 521 includes multiple flow channels 5211). In some other examples, each heat dissipation sub-tube 521 is a single-channel flat tube, and there is only one flow channel 5211 inside such heat dissipation sub-tube 521. In some other examples, the heat dissipation tube 52 may also be a complete pipe.

[0065] The cooling medium 512 can be converted between gaseous and liquid states. The liquid cooling medium 512 is stored in the gas-liquid channel 511 of the substrate 51. When the power module 2 is heated, the liquid cooling medium 512 will become gaseous, and at least part of the gaseous cooling medium 512 will flow into the heat pipe 52. Since the heat pipe 52 is entirely or partially located outside the shell 1, the heat pipe 52 can exchange heat with the air outside the shell 1. After cooling, the gaseous cooling medium 512 in the heat pipe 52 will be converted back into liquid cooling medium 512. The liquid cooling medium 512 will flow back into the substrate 51, and then absorb the heat of the power module 2, and become gaseous cooling medium 512 again, and flow into the heat pipe 52 to dissipate heat, so as to realize uninterrupted heat dissipation of the power module 2 through this cycle.

[0066] In some examples, in order to allow more liquid cooling medium 512 to flow back into the substrate 51, the radiator 5 may further include a manifold 53, the heat dissipation tube 52 is located between the substrate 51 and the manifold 53, the manifold 53 may be a hollow plate-like structure, and the manifold 53 has a manifold cavity 531, the manifold cavity 531 is connected to the internal channel of the heat dissipation tube 52, that is, one end of the heat dissipation tube 52 in the third direction is connected to the gas-liquid channel 511, and the other end is connected to the manifold cavity 531. The gaseous cooling medium 512 in the heat dissipation tube 52 can flow into the manifold 53 and become a liquid cooling medium 512 in the manifold 53. In addition, after becoming liquid, the gaseous cooling medium 512 in the heat dissipation tube 52 can also flow into the manifold 53, and the liquid cooling medium 512 in the manifold 53 will accumulate at the bottom of the manifold 53, and then flow back from the heat dissipation tube 52 to the substrate 51.

[0067] In some other examples (not shown in the drawings), the heat dissipation pipe 52 may also be arranged to be inclined so that the cooling medium 512 inside the heat dissipation pipe 52 can smoothly flow back to the substrate 51 in a liquid state.

[0068] Return to reference Figure 3 and Figure 4 In order to facilitate heat exchange between the radiator 5 and the air outside the housing 1, the power conversion device 101 may further include a blowing structure 6 (for example, a fan or blower), which is located outside the housing 1 and can blow air toward the radiator 5. In the example where the power conversion device 101 also includes a heat exchanger 4, the blowing structure 6 will also blow air to the heat exchanger 4, thereby cooling the radiator 5 and the heat exchanger 4. For example, after the power conversion device 101 is installed, the blowing structure 6 is located below the radiator 5 and the heat exchanger 4. In some other examples, the power conversion device 101 may also not include the blowing structure 6.

[0069] In addition, refer to Figure 3 and Figure 4 The power conversion device 101 may further include a heat dissipation cover 7, which is located outside the housing 1 and covers the radiator 5, the heat exchanger 4 and the blowing structure 6, wherein the heat dissipation cover 7 may be provided with an air inlet 71 and an air outlet 72, the air outlet 6 is closer to the air inlet 71, and the radiator 5 and the heat exchanger 4 are located between the air inlet 71 and the air outlet 72. Auxiliary reference Figure 6 The wind blown into the protective cover 57 from the air inlet 71 will flow between two adjacent heat dissipation sub-tubes 521 and then blown out from the air outlet 72.

[0070] Figure 7 The positional relationship between the power module 2 and the heat sink 5 is shown as an example. Figure 7 The second direction in is perpendicular to the first direction (auxiliary reference Figure 6 ), and the second direction is also perpendicular to the thickness direction (third direction) of the substrate 51. For example, when the power conversion device 101 is installed at a specified position and is in use, the second direction can be the direction of gravity. In some examples, the substrate 51 protrudes toward the bottom of the heat pipe 52 along the second direction. After the radiator 5 is installed on the housing 1, the power module 2 is connected to the substrate 51 of the radiator 5, and the power module 2 (the power module 2 indicated by the solid line frame) can be located as a whole below the heat pipe 52. In other examples, a portion of the power module 2 (the power module 2 indicated by the dotted line frame) is located below the heat pipe 52, and the other portion overlaps with the heat pipe 52 in the third direction.

[0071] In some other examples, the substrate 51 does not protrude significantly below the heat pipe 52. In this example, the power module 2 is not located below the heat pipe 52, and the power module 2 in this example overlaps with the heat pipe 52 in the third direction.

[0072] Since the cooling medium 512 needs to be injected into the substrate 51 from the outside, the heat sink 5 further includes a liquid injection pipe 55. Figure 8 The structure of a liquid injection tube 55 is shown as an example. The liquid injection tube 55 can be a metal tube, a plastic tube or a rubber tube, and the present application does not impose any specific restrictions on this. One end of the liquid injection tube 55 is fixed on the substrate 51, and the internal channel of the liquid injection tube 55 is connected to the gas-liquid channel 511 of the substrate 51. The cooling medium 512 can be injected into the gas-liquid channel 511 of the substrate 51 through the liquid injection tube 55. After the liquid injection is completed, the port of the liquid injection tube 55 can be blocked, reducing the possibility of the cooling liquid in the substrate 51 leaking from the liquid injection tube 55.

[0073] In addition, the radiator 5 further includes a first guard plate 54, the first guard plate 54 and the heat dissipation tube 52 are fixed on the same plate surface of the substrate 51, the first guard plate 54 and the heat dissipation tube 52 are arranged along a first direction, and the injection tube 55 is at least partially located between the first guard plate 54 and the heat dissipation tube 52. For example, Fig. 9 The positional relationship between a liquid injection pipe 55 and a heat dissipation pipe 52 is shown as an example. The liquid injection pipe 55 is located as a whole between the first protective plate 54 and the heat dissipation pipe 52, wherein the first protective plate 54 may be a hard plate, for example, the first protective plate 54 may be a metal plate, a plastic plate or other solid plate-like structure. The liquid injection pipe 55 is arranged between the first protective plate 54 and the heat dissipation pipe 52, and the liquid injection pipe 55 can be protected by the first protective plate 54, which reduces the possibility of damage to the liquid injection pipe 55 during the installation and transportation of the radiator 5.

[0074] Return to reference Figure 8 In the example where the injection tube 55 is located between the first protective plate 54 and the heat dissipation tube 52, the first protective plate 54 has an opening 541, and the opening 541 can be a square opening, a circular opening, or a special-shaped opening. The opening 541 penetrates the first protective plate 54 along the first direction, and in the first direction, the opening 541 is directly opposite to the injection tube 55. The above-mentioned opening 541 directly opposite to the injection tube 55 means that along the first direction, the opening 541 can expose the injection tube 55 to the outside, so that it is convenient to pull the injection tube 55 out from the opening 541 to the side of the first protective plate 54 away from the heat dissipation tube 52.

[0075] When it is necessary to inject liquid into the substrate 51 through the injection tube 55, the injection tube 55 can be pulled out from between the first protective plate 54 and the heat dissipation tube 52, and the pulled-out injection tube 55 can pass through the opening 541, and the pulled-out portion of the injection tube 55 extends to the side of the first protective plate 54 away from the heat dissipation tube 52, and the cooling medium 512 can be injected into the substrate 51 by injecting liquid into the injection tube 55. After the injection is completed, the port of the injection tube 55 is blocked, and then the injection tube 55 is readjusted (for example, bent or turned) between the first protective plate 54 and the heat dissipation tube 52, and the injection operation of the radiator 5 is completed.

[0076] The opening 541 may be disposed at any suitable location, for example, Figure 8 The first guard plate 54 has two edges opposite to each other in the second direction, edge a and edge b, and the opening 541 extends to one edge of the first guard plate 54 (eg, Figure 8 In other words, one of the edges (edge ​​b) of the first guard plate 54 is penetrated by the opening 541. Among the two edges of the first guard plate 54, the injection tube 55 is closer to the edge provided with the opening 541, and the opening 541 exposes the injection tube 55 to the outside. When the position of the injection tube 55 needs to be adjusted, for example, the injection tube 55 is adjusted to between the first guard plate 54 and the heat dissipation tube 52, or a part of the injection tube 55 is pulled out to the side of the first guard plate 54 away from the heat dissipation tube 52, and the opening 541 penetrates the edge of the first guard plate 54, so that the movement path of the injection tube 55 can also pass through the edge of the first guard plate 54 penetrated by the opening 541. In this way, the movement of the injection tube 55 is more convenient.

[0077] In some other examples, the opening 541 extends to the edge a of the first guard plate 54 , that is, the edge a of the first guard plate 54 is penetrated by the opening 541 .

[0078] In some other examples, Fig.10 Another structure of the opening 541 is shown as an example. Fig.10, the opening 541 is located in the middle area of ​​the first guard plate 54, that is, the opening 541 does not extend to any edge of the first guard plate 54. In this example, the opening 541 exposes the injection tube 55 to the outside, and the opening 541 can be a square opening, and the distance (L1) between the edge of the opening 541 away from the substrate 51 and the substrate 51 is greater than the distance (L2) between the end of the injection tube 55 away from the substrate 51 and the substrate 51. For example, in the case where the injection tube 55 is a relatively hard tube body (for example, a metal tube), the injection tube 55 is less flexible, and the edge of the opening 541 away from the substrate 51 is farther from the substrate 51 than the end of the injection tube 55. This is conducive to retracting the injection tube 55 through the opening 541 to between the first guard plate 54 and the heat dissipation tube 52, thereby reducing the possibility of the first guard plate 54 interfering with the movement of the injection tube 55.

[0079] exist Fig.10 In the example shown, if the size of the opening 541 allows the normal movement of the injection tube 55 (for example, bending between the first protective plate 54 and the heat dissipation pipe 52), the size of the opening 541 may not be limited. For example, the distance between the edge of the opening 541 away from the substrate 51 and the substrate 51 (L1) may be less than or equal to the distance between the end of the injection tube 55 away from the substrate 51 and the substrate 51 (L2).

[0080] Regarding the size of the opening 541, Figure 8 In the example shown, since the switch extends to the edge of the first guard plate 54, the injection tube 55 can be adjusted from the edge of the first guard plate 54 to between the first guard plate 54 and the injection tube 55, and the adjustment of the bending degree of the injection tube 55 does not depend on the size of the opening 541. Figure 8 In the example shown, the distance between the edge of the opening 541 facing away from the substrate 51 and the substrate 51 may be smaller than, equal to, or larger than the distance between the end of the injection tube 55 facing away from the substrate 51 and the substrate 51 .

[0081] In addition, the radiator 5 may further include a baffle 56. Fig.11 The structure of a baffle 56 is shown as an example. Fig.11 , the baffle 56 is fixed on the first guard plate 54, and the baffle 56 is used to block the opening 541. The baffle 56 is installed later, that is, after the injection of the injection tube 55 is completed, the injection tube 55 is adjusted between the first guard plate 54 and the heat dissipation tube 52, and then the baffle 56 is installed on the first guard plate 54, and the baffle 56 blocks the opening 541 on the first guard plate 54, so as to block the opening 541, further protect the injection tube 55, and reduce the possibility of damage to the injection tube 55.

[0082] The baffle 56 may be of any suitable structure, and may be fixed to the opening 541 in any suitable manner. For example, the baffle 56 may be fixed to the first guard plate 54 by bolts or screws; for another example, the baffle 56 may be bonded or welded to the first guard plate 54; for another example, the baffle 56 may be clamped to the first guard plate 54, or the baffle 56 may be first clamped to the first guard plate 54 and then reinforced by bolts. In the example where the baffle 56 is clamped to the first guard plate 54, a clamping groove 561 is provided on the baffle 56. Fig.12 The structure of a slot 561 is exemplarily shown. After the baffle 56 is installed on the first guard plate 54 , the portion of the first guard plate 54 surrounding the opening 541 is inserted into the slot 561 to fix the first guard plate 54 .

[0083] In another example, the injection pipe 55 is not entirely located between the first guard plate 54 and the heat dissipation pipe 52, but a portion of the injection pipe 55 is located between the first guard plate 54 and the heat dissipation pipe 52, and another portion of the injection pipe 55 is located on the side of the first guard plate 54 away from the heat dissipation pipe 52. For example, Fig.13 The structure of another injection tube 55 is shown by way of example. The injection tube 55 is bent, and the first protective plate 54 has an opening 541. The opening 541 penetrates the first protective plate 54 along a first direction. A portion of the injection tube 55 is located between the first protective plate 54 and the heat dissipation tube 52, and another portion of the injection tube 55 extends through the opening 541 to a side of the first protective plate 54 that is away from the heat dissipation tube 52.

[0084] That is, the injection tube 55 always passes through the opening 541 and extends to the side of the first protective plate 54 away from the heat dissipation tube 52. By injecting liquid into the injection tube 55, the cooling medium 512 can be injected into the gas-liquid channel 511 in the substrate 51. After the injection is completed, the tube mouth of the injection tube 55 is blocked without readjusting the injection tube 55 to between the first protective plate 54 and the heat dissipation tube 52. In this example, a part of the injection tube 55 is located between the first protective plate 54 and the heat dissipation tube 52, and the first protective plate 54 protects this part, which can also reduce the possibility of damage to the injection tube 55.

[0085] In addition, in this example, reference Fig.13 , the opening 541 may also extend to the edge of the first guard plate 54. In some other examples, the opening 541 may also be located in the middle area of ​​the first guard plate 54, as long as the opening 541 can allow the injection tube 55 to pass through.

[0086] In the example where the injection pipe 55 passes through the first protective plate 54, the radiator 5 further includes a protective cover 57. Fig.14The structure of a protective cover 57 is shown as an example. The protective cover 57 is fixed on the first protective plate 54, and the protective cover 57 is at least partially located on the side of the first protective plate 54 away from the heat dissipation pipe 52. For example, Fig.14 In the embodiment, the protective cover 57 is entirely located on the side of the first protective plate 54 away from the heat dissipation tube 52, and the portion of the injection tube 55 extending to the side of the first protective plate 54 away from the heat dissipation tube 52 is located inside the protective cover 57. In another example (not shown in the drawings), a portion of the protective cover 57 is located on the side of the first protective plate 54 away from the heat dissipation tube 52, and another portion is located between the first protective plate 54 and the heat dissipation tube 52. In this example, the protective cover 57 is also provided outside the injection tube 55 to protect the portion of the injection tube 55 extending to the side of the first protective plate 54 away from the heat dissipation tube 52.

[0087] Among them, the protective cover 57 can be fixed to the first guard plate 54 in any suitable manner. For example, the protective cover 57 can be locked on the first guard plate 54 by screws, and the protective cover 57 can also be fixed to the first guard plate 54 by bonding, welding or clamping. The protective cover 57 can also be first clamped on the first guard plate 54 and then reinforced by bolts. The present application does not impose any specific restrictions on this.

[0088] After the injection is completed, the nozzle of the injection tube 55 is sealed, the protective cover 57 is installed on the first protective plate 54, and the portion of the injection tube 55 located on the side of the first protective plate 54 away from the heat dissipation pipe 52 is protected by the protective cover 57. In this way, the portion of the injection tube 55 located between the first protective plate 54 and the heat dissipation pipe 52 is protected by the first protective plate 54, and the portion of the injection tube 55 located on the side of the first protective plate 54 away from the heat dissipation pipe 52 is protected by the protective cover 57. The protective cover 57 cooperates with the first protective plate 54 to further reduce the risk of damage to the injection tube 55.

[0089] In some examples, the radiator 5 further includes a second guard plate 58. Fig.15 The structure of the second guard plate 58 is shown as an example. Fig.15 , the second guard plate 58 and the first guard plate 54 are fixed on the same plate surface of the substrate 51, and in the first direction, the heat dissipation pipe 52 is located between the first guard plate 54 and the second guard plate 58. That is, the first guard plate 54 and the second guard plate 58 are respectively located on different sides of the heat dissipation pipe 52, and jointly protect the heat dissipation pipe 52, thereby reducing the possibility of damage to the heat dissipation pipe 52. In addition, when protecting the heat dissipation pipe 52, the first guard plate 54 can also provide protection for the injection pipe 55. Among them, the second guard plate 58 can be a hard plate, for example, the second guard plate 58 can be a metal plate, a plastic plate or other solid plate-like structures.

[0090] Reference Fig.15In an example where the heat dissipation tube 52 includes a plurality of heat dissipation sub-tubes 521, the heat dissipation tube 52 may further include a plurality of second fins 522, the plurality of heat dissipation sub-tubes 521 are arranged along the first direction, a gap is provided between two adjacent heat dissipation sub-tubes 521, and a plurality of second fins 522 are fixed between at least two adjacent heat dissipation sub-tubes 521. Fig.15 In the example shown, a plurality of second fins 522 are fixed between every two adjacent heat dissipation sub-tubes 521. The gaps between the plurality of heat dissipation sub-tubes 521 enable the heat dissipation sub-tubes 522 to efficiently exchange heat with the air. In addition, the second fins 522 can assist the heat dissipation sub-tubes 521 in heat dissipation, that is, the heat on the heat dissipation sub-tubes 521 can be transferred to the second fins 522, and heat is exchanged with the outside air through the second fins 522, further improving the heat dissipation efficiency of the radiator 5.

[0091] In some examples, fins may also be provided between the first guard plate 54 and the heat dissipation pipe 52. For example, the radiator 5 further includes a first fin 59. Fig.16 The structure of the first fin 59 is shown as an example. Fig.16 A plurality of first fins 59 may be provided, and the plurality of first fins 59 are fixed between the first guard plate 54 and the heat dissipation tube 52. Since a liquid injection tube 55 is provided between the first guard plate 54 and the heat dissipation tube 52, the first fins 59 avoid the liquid injection tube 55. Fig.17 The positional relationship between the first fin 59 and the injection pipe 55 is shown as an example. Fig.17 The first guard plate 54 in the figure is indicated by a shadow, referring to Fig.17 The injection tube 55 is close to one of the edges of the first guard plate 54 in the second direction (for example, edge b), and the first fin 59 is shorter in the second direction, thereby reducing the possibility of mutual interference between the first fin 59 and the injection tube 55, which is beneficial to the assembly of the radiator 5.

[0092] In some other examples, the first fins 59 may be provided on both sides of the injection tube 55 , and the injection tube 55 is located between the first fins 59 on both sides, so that the first fins 59 on both sides avoid the injection tube 55 located in the middle.

[0093] A first fin 59 is arranged between the first guard plate 54 and the heat dissipation pipe 52. The first fin 59 can assist the heat dissipation pipe 52 in heat dissipation. That is, the heat on the heat dissipation pipe 52 and the first guard plate 54 can be transferred to the first fin 59 and exchange heat with the outside air through the first fin 59, thereby further improving the heat dissipation efficiency of the radiator 5.

[0094] In addition, refer to Fig.17In the example where the radiator 5 includes a second guard plate 58, a plurality of third fins 50 may also be provided between the second guard plate 58 and the heat pipe 52, that is, the heat on the heat pipe 52 and the second guard plate 58 can be transferred to the third fins 50, and heat is exchanged with the outside air through the third fins 50, thereby further improving the heat dissipation efficiency of the radiator 5.

[0095] In some other examples, the heat sink 5 includes the first fin 59 and the third fin 50, but does not include the second fin 522. In some other examples, the heat sink 5 includes the first fin 59, but does not include the second fin 522 and the third fin 50.

[0096] In some examples, the power conversion device 101 includes a plurality of heat sinks 5, Fig.18 The internal structure of another power conversion device 101 is shown as an example. Fig.18 The power conversion device 101 includes two heat sinks 5, and the two heat sinks 5 are arranged along the second direction, and the two heat sinks 5 are both located in the space surrounded by the heat dissipation cover 7 and the housing 1. In this example, at least two power modules 2 are provided, and at least two power modules 2 have a height difference in the second direction. The substrate 51 of each heat sink 5 contacts at least one power module 2, and the two heat sinks 5 dissipate heat for multiple power modules 2 with a height difference in the second direction.

[0097] In addition, refer to Fig.18 A liquid injection pipe 55 is provided between the first guard plate 54 and the heat dissipation pipe 52 of each radiator 5. Fig.18 In the example shown, the injection pipe 55 is entirely located between the first guard plate 54 and the heat dissipation pipe 52. In some other examples, the injection pipe 55 is not entirely located between the first guard plate 54 and the heat dissipation pipe 52, but a portion of the injection pipe 55 is located between the first guard plate 54 and the heat dissipation pipe 52, and another portion is located on the side of the first guard plate 54 away from the heat dissipation pipe 52.

[0098] In some other examples (not shown in the drawings), when the power conversion device 101 includes multiple radiators 5, the power conversion device 101 may also include multiple heat exchangers 4, the multiple heat exchangers 4 are arranged along the second direction, and the multiple heat exchangers 4 and the multiple radiators 5 are staggered in the second direction.

[0099] When the power conversion device 101 is installed at a designated location and in use, the first direction and the thickness direction of the substrate 51 (the third direction) may be two mutually perpendicular horizontal directions, and the second direction may be the gravity direction (or vertical direction).

[0100] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A power conversion device, characterized in that: It includes a housing, a power module and a heat sink, wherein the housing is used to accommodate the power module, and the power module is used to convert direct current from a photovoltaic module or an energy storage battery into alternating current; The radiator comprises a base plate, a radiating pipe, a first protective plate and a liquid injection pipe; The substrate is fixed to the housing, the substrate has a gas-liquid channel, the gas-liquid channel has a cooling medium for gas-liquid conversion, the heat dissipation pipe is fixed to one of the plate surfaces of the substrate, and the internal channel of the heat dissipation pipe is connected to the gas-liquid channel; The housing has a mounting opening, the substrate and the heat dissipation pipe are both located outside the housing, the power module passes through the mounting opening and contacts the surface of the substrate facing away from the heat dissipation pipe, or the substrate is located inside the housing and contacts the power module, and the heat dissipation pipe passes through the mounting opening and extends outside the housing; The first guard plate and the heat dissipation pipe are fixed to the same plate surface of the substrate, and the first guard plate and the heat dissipation pipe are arranged along a first direction, and the first direction is perpendicular to the thickness direction of the substrate; One end of the liquid injection tube is fixed to the base plate, the inner channel of the liquid injection tube is communicated with the gas-liquid channel, and the liquid injection tube is at least partially located between the first protective plate and the heat dissipation tube.

2. The power conversion device according to claim 1, characterized in that: The injection pipe is located between the first guard plate and the heat dissipation pipe. The first guard plate has an opening. The opening penetrates the first guard plate along the first direction. In the first direction, the opening faces the injection pipe.

3. The power conversion device according to claim 2, characterized in that: The distance between the edge of the opening away from the substrate and the substrate is greater than the distance between the end of the liquid injection tube away from the substrate and the substrate.

4. The power conversion device according to claim 2 or 3, characterized in that: The radiator further comprises a baffle, which is fixed to the first guard plate and is used to block the opening.

5. The power conversion device according to claim 1, characterized in that: The first guard plate has an opening, which passes through the first guard plate along the first direction. A portion of the injection tube is located between the first guard plate and the heat dissipation tube, and another portion of the injection tube extends through the opening to a side of the first guard plate away from the injection tube.

6. The power conversion device according to claim 5, characterized in that: The radiator also includes a protective cover, which is fixed to the first protective plate. The protective cover is at least partially located on the side of the first protective plate away from the heat dissipation pipe, and the part of the injection pipe extending to the side of the first protective plate away from the injection pipe is located inside the protective cover.

7. The power conversion device according to any one of claims 2 to 6, characterized in that: The first guard plate has two edges opposite to each other in a second direction, and the first direction, the second direction and the thickness direction of the substrate are perpendicular to each other; The opening extends to one of the edges of the first guard plate, and the injection pipe is closer to the edge of the two edges where the opening is provided.

8. The power conversion device according to any one of claims 1 to 7, characterized in that: The radiator further comprises a first fin, which is fixed between the first guard plate and the heat dissipation pipe, and the first fin avoids the liquid injection pipe.

9. The power conversion device according to any one of claims 1 to 8, characterized in that: The radiator further includes a second guard plate, which is fixed to the same plate surface of the substrate as the first guard plate. In the first direction, the heat dissipation pipe is located between the first guard plate and the second guard plate.

10. The power conversion device according to any one of claims 1 to 9, characterized in that: The heat dissipation pipe includes a plurality of heat dissipation sub-tubes and a plurality of second fins. The plurality of heat dissipation sub-tubes are arranged along the first direction. There is a gap between two adjacent heat dissipation sub-tubes. A plurality of second fins are fixed between at least two adjacent heat dissipation sub-tubes. The internal channel of the heat dissipation pipe includes the internal channel of each of the heat dissipation sub-tubes.

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