WO2016197704A1

WO2016197704A1 - Heat dissipation structure applied to photovoltaic inverter

Info

Publication number: WO2016197704A1
Application number: PCT/CN2016/079785
Authority: WO
Inventors: 王栋; 刘爱龙; 黄创盛; 李星
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-01-05
Filing date: 2016-04-20
Publication date: 2016-12-15
Also published as: CN205356166U

Abstract

A heat dissipation structure, applied to a photovoltaic inverter. The heat dissipation structure comprises: a cabinet, and a fan assembly arranged within the cabinet and used for forming a heat dissipation air passage, an air inlet and an air outlet of the heat dissipation air passage being respectively located at a bottom portion and a top portion of the cabinet. The heat dissipation structure also comprises: a reactor and a power assembly arranged within the cabinet and located within the heat dissipation air passage, the position of the air inlet of the heat dissipation air passage being lower than the positions of the reactor and the power assembly within the cabinet. The present solution enables an inverter to effectively use the heat dissipation air passage to perform heat dissipation on the reactor and the power assembly, thereby effectively increasing the heat dissipation efficiency of the inverter.

Description

Heat dissipation structure applied to photovoltaic inverter

Technical field

The application relates to, but is not limited to, the field of solar photovoltaic power generation technology, and in particular to a heat dissipation structure applied to a photovoltaic inverter.

Background technique

Currently, photovoltaic grid-connected inverters are used when applying solar photovoltaic technology. In the photovoltaic grid-connected inverter, the power module and the reactor are the main heat sources of the inverter, so when the R&D personnel design the inverter, the two modules are the power module and the reactor. The heat dissipation structure is designed.

Summary of the invention

The following is an overview of the topics detailed in this document. This Summary is not intended to limit the scope of the claims.

The application provides a heat dissipation structure applied to a photovoltaic inverter, which can improve heat dissipation efficiency.

The embodiment of the present invention provides a heat dissipation structure, which is applied to a photovoltaic inverter, and the heat dissipation structure includes: a cabinet and a fan assembly disposed in the cabinet for forming a heat dissipation air duct, wherein the heat dissipation air passage is The air inlet and the air outlet are respectively located at the bottom and the top of the cabinet, and the heat dissipation structure further includes: a reactor and a power component disposed in the cabinet and located in the heat dissipation air duct, wherein the heat dissipation air duct advances The tuyere is positioned lower than the reactor and the power assembly.

Optionally, at least two of the reactors are disposed in the cabinet.

Optionally, the at least two reactors are dislocated and disposed in the heat dissipation air duct in a horizontal direction.

Optionally, the position of the fan assembly and the power assembly within the cabinet is higher than a position of the reactor within the cabinet.

Optionally, the fan assembly is located within the cabinet at an upper or lower portion of the power assembly.

Optionally, the power component includes a heat sink and a capacitor component, the heat sink is located at an upper portion of the capacitor component, a tuyere of the fan component is adjacent to a tuyere of the capacitor component, a tuyere of the heat sink, and / or the air outlet of the heat dissipation air passage is opposite.

Optionally, the air inlet of the heat dissipation air duct communicates with the air inlet of the cabinet, and the air inlet of the heat dissipation air channel is higher than the air inlet of the cabinet.

Optionally, the air inlet of the cabinet is located on a side of the bottom of the cabinet; or the air inlet of the cabinet is located on a side and a bottom surface of the bottom of the cabinet.

Optionally, the heat dissipation air channel is a straight air channel.

Optionally, an air filter is disposed at the air inlet of the cabinet, the fan component is a centrifugal fan, and a power distribution component of the heat dissipation structure is disposed in the cabinet and located at a front of the reactor.

The beneficial effects of the application are:

The heat dissipation structure of the embodiment of the present invention forms a forced heat dissipation duct from the bottom of the cabinet to the top of the cabinet under the action of the fan assembly. Since the reactor and the power component are disposed in the forced air duct, and the position of the air inlet of the forced air duct is lower than the position of the reactor and the power component in the cabinet, the cold air outside the cabinet enters the cabinet, Under the action of the air guiding effect of the cooling air duct and the negative pressure of the fluid, it is forced to flow through the reactor and the power component placed in the heat dissipating duct, so that the reactor and the power component can be sufficiently cooled and dissipated, and the reactor is improved. The service life, while effectively improving the heat dissipation efficiency of the whole machine.

Other aspects will be apparent upon reading and understanding the drawings and detailed description.

BRIEF abstract

1 is a schematic diagram of a heat dissipation structure of an inverter in the related art;

2 is a schematic structural view of an embodiment of a heat dissipation structure provided by the present application;

3 is a schematic structural view of another embodiment of a heat dissipation structure provided by the present application;

4 is a schematic structural view of another embodiment of a heat dissipation structure provided by the present application.

Preferred embodiment of the invention

The present application will be described in detail below with reference to the accompanying drawings and embodiments.

It should be noted that, if not conflicting, the embodiments of the present invention and the various features in the embodiments may be combined with each other, and are all within the protection scope of the present application.

In the related art, many heat dissipation structures of inverters have appeared. As shown in FIG. 1, it is a heat dissipation structure of an inverter in the related art. The heat dissipation structure of the inverter shown in FIG. 1 includes: a cabinet; a radiator 11 of an IGBT (Insulated Gate Bipolar Transistor) module, which is disposed at the top of the cabinet; and a forward centrifugal fan module 12, which is disposed Below the radiator 11 of the IGBT module, and through the air duct, the radiator 11 is connected; and the reactor 13 is disposed at a center of the bottom of the cabinet. In addition, air inlets 14 are formed on both sides of the bottom of the cabinet.

The heat dissipation structure of the inverter shown in FIG. 1 is such that the reactor 13 is disposed at the bottom of the cabinet, such that the reactor 13 cannot be sufficiently disposed in the air passage (for example, the reactor 13 is substantially located below the air inlet of the air duct) ), resulting in poor heat dissipation and short service life; and such design will also result in high air inlet temperature of the IGBT module heat sink 11 and high heat sink requirements, which will result in a generally high cost of the inverter cabinet.

In view of this, the heat dissipation structure applied to the photovoltaic inverter provided by the present application includes the heat dissipation structure described in the embodiments shown in FIG. 2 to FIG. 4 described below. Hereinafter, the heat dissipation structure provided by the embodiment of the present invention will be described in detail with reference to FIGS. 2 to 4.

As shown in FIG. 2 to FIG. 4, the heat dissipation structure applied to the photovoltaic inverter includes: a cabinet 21 and a fan assembly 22 disposed in the cabinet 21 for forming a heat dissipation air passage. The air inlet 23 of the heat dissipation air duct is located at the bottom of the cabinet 21, for example, can be disposed under the front side of the cabinet 21, and the air outlet 24 of the heat dissipation air duct is located at the top of the cabinet 21, thereby forming a bottom air inlet top air outlet in the entire cabinet 21. Straight air duct, that is, the forced air duct from the bottom of the cabinet to the top of the cabinet. The heat dissipation structure further includes: a reactor 25 and a power component 26 disposed in the cabinet 21 and located in the heat dissipation duct, wherein the position of the air inlet 23 of the heat dissipation air duct is lower than the position of the reactor 25 and the power component 26 in the cabinet 21 .

The air inlet 23 of the heat dissipation air duct communicates with the air inlet 27 of the cabinet 21, and the air inlet 23 of the heat dissipation air duct is higher than the air inlet 27 of the cabinet 21, so that the outside cold air enters the cabinet 21 and is inside the heat dissipation air duct. Under the action of the fan assembly 22, it will flow into the heat dissipation air passage. The air inlet 27 of the cabinet 21 may be disposed in the vicinity of the air inlet 23 of the heat dissipation air duct. For example, the air inlet 27 of the cabinet 21 may be located on the side of the bottom of the cabinet 21, or the air inlet 27 of the cabinet 21 may also be Located on the side and bottom of the bottom of the cabinet 21. As shown in FIG. 3 and FIG. 4 , the position of the air inlet 27 of the cabinet 21 can also be disposed at other positions of the cabinet 21 according to the air volume and the specific implementation environment, as long as the position of the air inlet 27 of the cabinet 21 is lower than the heat dissipation. The position of the air inlet 23 of the duct can be. In the implementation, an air filter can be disposed at the air inlet 27 of the cabinet 21 for dusting the cold air entering the outside, and the fan assembly 22 can select the centrifugal fan. At the same time, the power distribution component 28 of the heat dissipation structure does not need to dissipate heat, so it can be disposed in the cabinet 21 and located at the front of the reactor 25, that is, the power distribution component 28 is not disposed in the heat dissipation air duct, and the purpose is to reduce the distribution as much as possible. The electrical component 28 blocks the cold air, ensures that more cold air enters the heat dissipation air passage, flows to the reactor 25 and the power component 26, and improves the heat dissipation of the heat dissipation structure.

When the heat dissipation structure of the embodiment is in operation, under the action of the fan assembly 22, a heat dissipation air passage is formed at the bottom of the cabinet and the wind is exhausted at the top, and the heat dissipation air passage is a straight air passage. Moreover, since the position of the air inlet 23 of the heat dissipation air duct is lower than the position of the reactor 25 and the power component 26 in the cabinet 21, the cold air outside the cabinet 21 enters the cabinet 21, and the air guiding effect and fluid in the heat dissipation air duct Under the action of the negative pressure, it is forced to flow through the reactor 25 and the power component 26 placed in the heat dissipation duct, so that the reactor 25 and the power component 26 can be sufficiently cooled and dissipated to improve the service life of the reactor 25 while Effectively improve the heat dissipation efficiency of the whole machine.

Optionally, the number of reactors 25 disposed in the cabinet may be at least two, and the at least two reactors 25 are all dislocated and disposed in the heat dissipation air duct in a horizontal direction, or the reactor 25 is laterally disposed. In the cooling air duct. The purpose of such an arrangement is to increase the amount of wind on the surface of the reactor 25, thereby enabling sufficient cooling of the reactor 25 and improving the heat dissipation capability of the reactor 25.

In an alternative embodiment, the position of the fan assembly 22, the reactor 25, and the power assembly 26 located in the heat dissipation duct of the cabinet 21 may be such that the fan assembly 22 and the power assembly 26 are positioned high in the heat dissipation duct of the cabinet 21. The position of the reactor 25 in the heat dissipation air passage of the cabinet 21. After the cold air enters the cabinet 21 from the air inlet 27 of the cabinet at the bottom of the cabinet 21, under the action of the air guiding effect of the heat dissipation air passage and the negative pressure of the fluid, it is forced to flow from the air inlet 23 of the heat dissipation air duct and placed in the heat dissipation air passage. Reactor 25, then as the fluid negative pressure and lift force increase, the cold air will slowly flow upward, so that the temperature of the air inlet into the power component 26 is low, so that the power component 26 needs to have a low heat dissipation capability, which can be to some extent. Reduce costs.

As shown in FIGS. 3-4, in another embodiment, the position of the fan assembly 22 within the cabinet 21 may be located at the upper or lower portion of the power assembly 26, and the air duct assembly between the fan assembly 22 and the power assembly 26 The connections are such that the fan assembly 22 adequately dissipates the power assembly 26. The power module 26 includes a heat sink 261 and a capacitor assembly 262. The heat sink 261 is located at an upper portion of the capacitor assembly 262. The air outlet of the fan assembly 22 is in the air outlet of the capacitor assembly 262, the air outlet of the heat sink 261, and the air outlet of the heat dissipation air duct. The one or more tuyere/air outlets adjacent to the tuyere of 22 are opposite to each other, and the purpose is to prevent the cold air from being blocked as much as possible, to better form a straight heat dissipation air passage, and to improve the heat dissipation efficiency of the heat dissipation air passage.

As shown in FIG. 3, when the fan assembly 22 is located at the lower portion of the power assembly 26, the air outlet of the fan assembly 22 is opposite to the air inlet of the capacitor assembly 262, and the air outlet of the capacitor assembly 262 is opposite to the air inlet of the heat sink 261. The air outlet of the 261 is opposite to the air outlet 24 of the heat dissipation air duct. When the heat dissipation structure is working, the wind direction in the heat dissipation air duct is: after the cold air enters the cabinet 21 from the air inlet 27 of the cabinet at the bottom of the cabinet 21, it is forced to flow from the heat dissipation air passage under the action of the air guiding effect of the heat dissipation air passage and the negative pressure of the fluid. The air inlet 23 flows in, flows through the reactor 25 placed in the heat dissipation duct, and then as the fluid negative pressure and the lift force increase, the cold air slowly flows upward, and under the action of the fan assembly 22, the airflow quickly enters the fan assembly. 22, the fan assembly 22 accelerates the airflow to form a high-speed airflow, enters the heat sink 261 and the capacitor assembly 262 in the power assembly 26 through the air duct, carries away heat from the power assembly 26, and finally from the air outlet 24 at the top of the cabinet. discharge.

As shown in FIG. 4, when the fan assembly 22 is located at the upper portion of the power assembly 26, the air outlet of the capacitor assembly 262 is opposite to the air inlet of the heat sink 261, and the air outlet of the heat sink 261 is opposite to the air inlet of the fan assembly 22, and the fan assembly The air outlet of 22 is opposite to the air outlet 24 of the heat dissipation duct. When the heat dissipation structure is working, the wind direction in the heat dissipation air duct is: after the cold air enters the cabinet 21 from the air inlet 27 at the bottom of the cabinet 21, under the action of the air guiding effect of the heat dissipation air passage and the negative pressure of the fluid, it is forced to enter from the heat dissipation air passage. The tuyere 23 flows in, flows through the reactor 25 disposed in the heat dissipating duct, and then as the fluid negative pressure and the buoyancy increase, the cold air gradually flows upward, flowing into the radiator 261 of the power assembly 26 and the capacitor assembly 262, in the fan Under the action of the exhaust of the assembly 22, the heat of the power assembly 26 is removed and finally discharged from the air outlet 24 at the top of the cabinet.

In summary, in the heat dissipation structure described in this embodiment, the power component 26 and the reactor 25 in the inverter are placed in the same heat dissipation air channel for uniform layout, and the whole adopts the air intake at the bottom of the cabinet. The cooling air duct structure of the air outlet makes a reasonable layout for each heat-generating part inside the inverter, and the inverter can effectively utilize the heat-dissipating air passage, increase the surface air volume of the reactor, and achieve sufficient cooling of the reactor, and the airflow passes through After the fan assembly 22 is accelerated, for example, the centrifugal fan is formed to form a high-speed air flow, and flows into the power component 26 to intensify heat dissipation of the power component 26, thereby effectively improving the heat dissipation efficiency of the whole machine, having high power density, compact structure, high heat dissipation efficiency, and heat dissipation. The advantage of low cost.

The above is only the embodiment of the present invention, and thus does not limit the scope of the patent application, and the equivalent structure or equivalent process transformation made by using the specification and the drawings of the present application, or directly or indirectly applied to other related The technical field is equally included in the scope of patent protection of the present application.

Industrial applicability

Claims

A heat dissipation structure is applied to a photovoltaic inverter, and the heat dissipation structure includes: a cabinet and a fan assembly disposed in the cabinet for forming a heat dissipation air duct, wherein the air inlet and the air outlet of the heat dissipation air channel are respectively located The heat dissipation structure further includes: a reactor and a power component disposed in the cabinet and located in the heat dissipation air duct, wherein a position of the air inlet of the heat dissipation air duct is lower than the bottom The reactor and the location of the power assembly within the cabinet.
The heat dissipation structure according to claim 1, wherein at least two of said reactors are disposed in said cabinet.
The heat dissipation structure according to claim 2, wherein the at least two of the reactors are misaligned and disposed in a horizontal direction in a longitudinal direction.
The heat dissipation structure of claim 1 wherein said fan assembly and said power assembly are positioned within the cabinet above a location of said reactor within said cabinet.
The heat dissipation structure of claim 4 wherein said fan assembly is located within said cabinet at an upper or lower portion of said power assembly.
The heat dissipation structure according to claim 5, wherein the power component comprises a heat sink and a capacitor assembly, the heat sink is located at an upper portion of the capacitor assembly, and a tuyere of the fan assembly and a tuyere of the adjacent capacitor assembly The tuyere of the radiator and/or the air outlet of the heat dissipating air passage are opposite.
The heat dissipation structure according to any one of claims 1 to 6, wherein an air inlet of the heat dissipation air duct communicates with an air inlet of the cabinet, and an air inlet of the heat dissipation air duct is higher than a cabinet inlet tuyere.
The heat dissipation structure according to claim 7, wherein an air inlet of the cabinet is located on a side of a bottom of the cabinet;

Alternatively, the air inlet of the cabinet is located on a side and a bottom surface of the bottom of the cabinet.
The heat dissipation structure according to any one of claims 1 to 6, wherein the heat dissipation air passage is a straight air passage.
The heat dissipation structure according to any one of claims 1 to 6, wherein a dustproof net is disposed at an air inlet of the cabinet, the fan assembly is a centrifugal fan, and a power distribution component of the heat dissipation structure is disposed at the Inside the cabinet and at the front of the reactor.