CN115066165A - Heat radiation structure and centralized contravariant all-in-one of outdoor equipment - Google Patents

Abstract

The invention discloses a heat dissipation structure of outdoor equipment and a centralized inversion all-in-one machine. The heat dissipation problem of connecting the copper bar and connecting the cavity between inverter and the transformer has not only been solved, but also the cross-sectional dimension of copper bar can be reduced simultaneously. The temperature of the connecting copper bar and the connecting cavity between the inverter and the transformer is reduced, and the service life of internal devices is prolonged.

Description

A heat dissipation structure for outdoor equipment and a centralized inverter integrated machine

technical field

The invention belongs to the technical field of power transmission and transformation equipment, and in particular relates to a heat dissipation structure for outdoor equipment and a centralized inverter integrated machine.

Background technique

With the development of 1500V outdoor inverters, the power level of a single centralized inverter has basically reached its peak, which cannot meet the capacity requirements of a large square-array photovoltaic power station. Therefore, most manufacturers begin to design reverse centralized inverters. Change the design concept, learn from the design idea of the string inverter, adopt the modular parallel method, carry out the single-unit modular design of the high-power centralized inverter, and achieve a higher power level by connecting multiple units in parallel. The modular design of a single inverter can meet the needs of large-scale photovoltaic power stations for high-power centralized inverters by using multiple parallel devices.

At present, the high-power centralized inverter integrated machine (inverter and transformer are placed together when leaving the factory) are mainly products in the domestic market. The centralized integrated machine includes one or more centralized inverter units and a matching transformer. In order to save the construction cost and material cost of the power station, the owner requires the inverter and the transformer to be placed on a base and connected by copper bars. The use of copper bars to connect the inverter and the transformer saves project construction and material costs, but it brings new problems, that is, the three-phase copper bars are placed in a closed space without heat dissipation, and the copper bars and the cavity are not radiated. The temperature will continue to rise. If the transformers and cables installed inside it work in a high-temperature environment for a long time, the insulation material will deteriorate more rapidly, and there may be a risk of fire for a long time. Therefore, how to dissipate the waste heat in the connecting copper bars of the inverter and the transformer and inside the cavity is a new problem. At present, the heat dissipation of the connecting copper bars and connecting cavities of the outdoor high-power inverter all-in-one machine mainly includes the following forms.

(1) Increase the size of the copper bar connecting the inverter and the transformer to reduce the resistance of the copper bar, thereby reducing the heat generation;

(2) Add a fan outside the connection cavity between the inverter and the transformer, and use forced air cooling to dissipate heat;

(3) An elbow is added to the upper part of the connection cavity between the inverter and the transformer to connect the connection cavity with the external environment, and use the "chimney effect" to dissipate heat by natural convection;

(4) Add a small radiator to the copper bar connecting the inverter and the transformer to dissipate the heat on the copper bar.

The above and other heat dissipation methods have the following problems.

(1) Although increasing the size of the copper bar can solve the heating problem of the copper bar and thereby reduce the internal temperature of the connection cavity, the cost of the copper bar is relatively high, which will increase the cost of the whole machine;

(2) Adding a cooling fan at the lower part of the connection cavity of the inverter and the transformer or adding an elbow convection heat dissipation at the upper part will make the connection cavity communicate with the outside, so that the protection level inside the entire connection cavity cannot meet the requirements;

(3) Although adding a small heat sink to the connecting copper bar can reduce the heat of the copper bar, the heat generated by the copper bar will still accumulate inside the connecting cavity and cannot be dissipated, and the temperature of the entire connecting cavity will continue to rise.

SUMMARY OF THE INVENTION

The invention provides a heat dissipation structure for outdoor equipment and a centralized inverter integrated machine, which can dissipate heat from the copper bars connected to the inverter and the transformer and inside the cavity without increasing the cost of the copper bars.

In order to achieve the above purpose, the present invention provides a heat dissipation structure for outdoor equipment, including a heat dissipation fan and a connection cavity, the connection cavity is used to accommodate the connection copper bars, one end of the connection cavity is communicated with the inverter, and the inverter is installed on the inverter. There is a heat exchanger; the cooling fan is arranged on the side connected with the connecting cavity in the inverter, and a return air hole is arranged under the cooling fan.

Further, the connecting cavity is provided with a baffle, the length of the baffle is less than the length of the connecting cavity, the upper part of the baffle is the upper cavity, the lower part is the lower cavity, and the upper cavity and the horizontal axis of the cooling fan are on the same plane. , the lower cavity and the horizontal axis of the air return hole are on the same plane.

Further, the height of the upper cavity is greater than the height of the lower cavity.

Further, the connecting copper bars are located in the upper cavity.

Further, the main part of the connecting cavity is a shell with two ends open, including four side plates connected end to end in sequence, a circle of connecting plates are arranged on the outer sides of both ends of the main body, and the connecting plates are provided with threaded holes.

A centralized inverter integrated machine, comprising one or more parallel inverters, a transformer and a connecting copper bar; a heat exchanger is installed on the inverter; a connecting cavity is arranged outside the connecting copper bar, and the connecting copper One end of the row is connected to the three-phase AC output copper bar of the inverter, and the other end is connected to the three-phase input copper bar of the transformer; the first end of the connection cavity is connected to the inverter, and the second end is connected to the transformer; the inverter is connected to the connection cavity A cooling fan is arranged on the inner wall of the body connection, and a return air hole is arranged under the cooling fan.

Further, there are two cooling fans, which are respectively arranged on both sides of the three-phase AC output copper bars of the inverter.

Further, the air return hole is a rectangular hole.

Further, the first end of the connection cavity is fixedly connected with the inverter docking flange, and the second end is fixedly connected with the transformer docking flange.

Compared with the prior art, the present invention has at least the following beneficial technical effects:

The invention includes a connecting cavity, a cooling fan and a return air hole, the heat generated by the copper bars is discharged into the inverter, the cooling fan and the return air hole enter the heat exchanger, and the waste heat is discharged to the outside through the heat exchanger, thereby solving the problem of solving the problem. The heat dissipation problem of the connecting copper bars and the connecting cavity between the inverter and the transformer, the decrease of the temperature of the connecting copper bars and the connecting cavity, improves the service life of the internal components, and at the same time reduces the amount of the connecting copper bars, making the whole machine Costs are further reduced.

Further, a baffle is arranged in the connection cavity, so that the air flows according to the optimal heat dissipation path, and the heat dissipation effect is improved.

Further, two cooling fans are arranged at the lower part of the inverter, which can effectively pump the air flow in the connecting cavity to the inverter, so that it enters the heat exchanger for heat dissipation.

In the high-power centralized inverter integrated machine of the present invention, the copper bars are connected between the inverter and the transformer, and the connection cavity is communicated with the internal cavity of the AC side of the inverter, and the heat generated by the copper bars is discharged into the inverter. , make full use of the heat exchanger inside the inverter to discharge the waste heat to the external environment. It not only solves the heat dissipation problem of the connecting copper bar between the inverter and the transformer and the connecting cavity, but also reduces the cross-sectional size of the copper bar. The reduction of the temperature of the connecting copper bars and the connecting cavity between the inverter and the transformer improves the service life of the internal devices. And in the whole high-power centralized inverter integrated machine, there is no direct airflow exchange between the connection cavity between the inverter and the transformer and the outside, and the protection performance is higher.

Description of drawings

Fig. 1 is the overall layout diagram of the present invention;

Figure 2a is a schematic diagram of one side of the connection between the inverter and the connection cavity of the present invention;

Fig. 2b is a schematic diagram of the internal heat dissipation diagram of the inverter of the present invention;

Fig. 3 is the schematic diagram of the three-phase input terminal and the connection flange of the transformer according to the present invention;

FIG. 4 is a diagram showing the connection between the inverter and the transformer and the connection of the copper bar and the connection cavity;

FIG. 5 is a diagram showing the heat dissipation of the connecting copper bars and the cavity of the inverter and the transformer of the present invention.

In the drawings: 1. Transformer, 2. Inverter, 3. Connecting cavity, 4. Connecting copper bar, 5. Heat exchanger, 6. Cooling fan, 7. Inverter three-phase AC output copper bar, 8 , Transformer three-phase input copper bar, 9, Inverter docking flange, 10, Transformer docking flange, 11, Return air hole, 31, Upper chamber, 32, Lower chamber, 33, Partition, 34, Side board, 35, connecting board.

Detailed ways

In order to make the purpose and technical solutions of the present invention clearer and easier to understand. The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

In the description of the present invention, it should be understood that the terms "center", "portrait", "horizontal", "top", "bottom", "front", "rear", "left", "right", " The orientation or positional relationship indicated by vertical, horizontal, top, bottom, inner, outer, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and The description is simplified rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first" or "second" may expressly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "plurality" means two or more. In the description of the present invention, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

In order to overcome the heat dissipation problem of connecting copper bars and connecting cavities between the inverter and the transformer in the existing high-power centralized inverter integrated machine, the patent of the present invention provides a simple structure, ingenious design, reliable performance and good protection. , Heat dissipation scheme with high heat dissipation efficiency.

The layout diagram of the high-power centralized inverter integrated machine described in the present invention provides a heat dissipation structure with simple structure, ingenious design, reliable performance, good protection and high heat dissipation efficiency.

Example 1

Referring to FIG. 1 , the high-power centralized inverter integrated machine of the present invention is mainly composed of one or more parallel inverters 2 , a matching transformer 1 , and a connecting copper bar 4 between the inverter 2 and the transformer 1 . , and a closed connection cavity 3 that protects the connection copper bars. One end of the connecting copper bar 4 between the inverter 2 and the transformer 2 is connected to the three-phase AC output copper bar 7 of the inverter, and the other end is connected to the three-phase input copper bar 8 of the transformer. The connection cavity 3 is arranged in the inverter 2 Between the transformer 1, the first end is communicated with the transformer 1, the second end is communicated with the inverter 2, the first end is connected with the inverter docking flange 9 by screws, and the second end is connected with the transformer docking flange 10. Screw fixed connection, the connection copper bar 4 between the inverter 2 and the transformer 1 is arranged inside the connection cavity 3 .

Referring to Figure 2a, the inverter AC side is provided with an inverter three-phase AC output copper bar 7 and an inverter docking flange 9 docking with the connecting cavity 3, and the inverter docking flange 9 is inside the inverter three-phase inverter. A cooling fan 6 is installed on both sides of the AC output copper bar 7, and the cooling fan 6 realizes the heat dissipation of the connection copper bar 4 and the connection cavity 3; the cooling fan 6 and the lower part of the three-phase AC output copper bar 7 are provided with two return air Hole 11; the inverter docking flange 9 and the connection cavity 3 are connected by screws.

Referring to Figure 2b, the internal cavity of the high-power outdoor inverter uses an external heat exchanger to dissipate heat from the internal devices. Under the action of the circulating fan in the heat exchanger 5, the airflow circulates inside the inverter 2 to transfer heat. To the heat exchanger 5, the heat exchanger 5 circulates the heat outside the inverter to realize heat dissipation.

3 is a schematic diagram of the transformer three-phase input copper bar 8 and the transformer docking flange 10 of the present invention, the transformer three-phase input copper bar 8 is connected to the second end of the connecting copper bar 4, and the transformer docking flange 10 and the connection cavity 3 are connected by screws .

4 is a schematic diagram of the connection copper bar 4 and the connection cavity 3 between the inverter and the transformer of the present invention. The connection copper bar 4 between the inverter 2 and the transformer 1 is arranged inside the connection cavity 3, and one end is connected to the inverter. The three-phase AC output copper bar 7 of the inverter is connected, and one end is connected to the three-phase input copper bar 8 of the transformer; The main part of the connection cavity 3 is a shell with two ends open, including four side plates 34 connected end to end in sequence, and a circle of connecting plates 35 are provided on the outer sides of both ends of the main body. The connecting plates are provided with threaded holes for It is connected with the inverter docking flange 9 or the transformer docking flange 10 by screws. The connecting cavity 3 is provided with a partition 33 . The upper cavity 31 is located above the partition 33 and the lower cavity 32 is located below. The height of the upper cavity 31 is greater than that of the lower cavity 32 . The connecting copper bar 4 is located in the upper cavity 31. The upper cavity 31 is aligned with the fan inside the inverter flange and the three-phase AC output copper bar 7 of the inverter and communicates with the AC side of the inverter. The lower cavity 32 is connected to the inverter. The return air hole 11 at the lower part of the three-phase AC output copper bar 7 of the inverter is connected to the AC side of the inverter; the length of the partition plate 33 is less than the length of the connecting cavity 3, which is the flow channel for the air to flow out. When the cooling fan 6 is running The air flow inside the cavity connecting the copper bars 4 can be realized, so as to achieve the purpose of heat dissipation.

Fig. 5 is the heat dissipation diagram of the inverter and the transformer connected to the copper bar 4 and the cavity of the present invention. The internal cavity of the high-power outdoor inverter adopts the external heating exchange method to dissipate heat from the internal devices. Under the action of the circulating fan in the heat exchanger 5 , the air circulates inside the inverter to transfer the heat to the heat exchanger 5, and the heat exchanger 5 circulates the heat outside the inverter; the AC end of the inverter is provided with three-phase AC output copper bars and the inverter is connected Flange 9, the upper part of the inner side of the inverter docking flange 9 is installed with a cooling fan 6, and the lower part is provided with a return air hole 11. There is a partition 33 inside the connection cavity 3, which divides the connection cavity 3 into upper and lower parts. The copper bar 4 is located in the upper cavity 31, the upper cavity 31 is aligned with the fan inside the inverter flange and the three-phase AC output copper bar and communicates with the AC side of the inverter, and the lower cavity 32 is connected with the fan and the three-phase inverter. The return air hole 11 at the lower part of the AC output copper bar 7 communicates with the AC side of the inverter; the middle partition 33 of the connection cavity 3 has a hole on the side close to the transformer. When the fan inside the inverter flange is running, The air flow inside the connection cavity 3 can be realized, so as to achieve the purpose of dissipating heat to the connection copper bar 4 and the connection cavity 3 .

Example 2

A heat dissipation structure for an inverter integrated machine, comprising a heat exchanger 5, a cooling fan 6 and a connection cavity 3, the inverter integrated machine includes one or more centralized inverters 2 and a matching transformer 1, The transformer 1 and the inverter are connected by connecting copper bars 4 ; the first end of the connecting cavity 3 is connected with the inverter 2 , and the second end is connected with the transformer 1 .

The main part of the connection cavity 3 is a shell with two ends open, including four side plates connected end to end in sequence, a circle of connecting plates are arranged on the outer sides of the two ends of the main body, and the connecting plates are provided with threaded holes for connecting with the reverse. inverter or transformer for connection. Two cooling fans 6 are arranged at the lower part of the inverter 2 , and two rectangular air return holes 11 are arranged below the cooling fans 6 . The connecting cavity 3 is provided with a partition 33 , the upper cavity 31 is located above the partition 33 , and the lower cavity 32 is located below. The connecting copper bar 4 is located in the upper cavity 31, the upper cavity 31 is aligned with the cooling fan in the inverter and the three-phase AC output copper bar 7 of the inverter and communicates with the AC side of the inverter, and the lower cavity 32 is connected to the inverter. The return air hole 11 at the lower part of the three-phase AC output copper bar 7 of the inverter is connected to the AC side of the inverter; the length of the partition plate 33 is less than the length of the connecting cavity 3, which is the flow channel for the air to flow out. When the cooling fan 6 is running , the air flow of the inverter enters the lower cavity 32 from the return air hole 11, flows to the side of the connecting cavity 3 close to the transformer, and flows to the upper cavity 31 through the channel between the partition plate and the side wall of the transformer, and then dissipates heat. Under the action of the fan, it flows from the upper cavity 31 to the heat exchanger, and dissipates heat through the heat exchanger.

The above content is only to illustrate the technical idea of the present invention, and cannot limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention all fall within the scope of the claims of the present invention. within the scope of protection.

Claims (9)

1. The heat dissipation structure of the outdoor equipment is characterized by comprising a heat dissipation fan (6) and a connecting cavity (3), wherein the connecting cavity (3) is used for accommodating a connecting copper bar (4), one end of the connecting cavity (3) is communicated with an inverter (2), and a heat exchanger (5) is installed on the inverter (2); the heat dissipation fan (6) is arranged in the inverter (2) and on one side connected with the connecting cavity (3), and an air return hole (11) is formed below the heat dissipation fan (6).

2. The heat dissipation structure of outdoor equipment according to claim 1, wherein a partition (33) is disposed in the connection cavity (3), the length of the partition (33) is smaller than that of the connection cavity (3), an upper cavity (31) is above the partition (33), a lower cavity (32) is below the partition (33), the upper cavity (31) and the horizontal axis of the heat dissipation fan (6) are on the same plane, and the lower cavity (32) and the horizontal axis of the return air hole (11) are on the same plane.

3. A heat dissipating structure of an outdoor unit according to claim 2, characterized in that the height of the upper cavity (31) is greater than the height of the lower cavity (32).

4. The heat dissipation structure of an outdoor device according to claim 1 or 3, wherein the connecting copper bar (4) is located in the upper cavity (31).

5. The heat dissipation structure of outdoor equipment according to claim 1, wherein the main body portion of the connection cavity (3) is a shell with two open ends, and comprises four side plates (34) connected end to end in sequence, a circle of connection plate (35) is arranged outside the two ends of the main body, and the connection plate is provided with a threaded hole.

6. A centralized inversion all-in-one machine is characterized by comprising one or more inverters (2) connected in parallel, a transformer (1) and a connecting copper bar (4); a heat exchanger (5) is arranged on the inverter (2); a connecting cavity (3) is arranged outside the connecting copper bar (4), one end of the connecting copper bar (4) is connected with the inverter three-phase alternating current output copper bar (7), and the other end of the connecting copper bar is connected with the transformer three-phase input copper bar (8); the first end of the connecting cavity (3) is communicated with the inverter (2), and the second end of the connecting cavity is connected with the transformer (1); the inner wall that inverter (2) and connection cavity (3) are connected is provided with radiator fan (6), radiator fan (6) below is provided with return air hole (11).

7. The integrated centralized inversion all-in-one machine as claimed in claim 6, wherein two cooling fans (6) are respectively arranged on two sides of the inverter three-phase alternating current output copper bar (7).

8. A centralized inversion all-in-one machine as claimed in claim 6, wherein the return air hole (11) is a rectangular hole.

9. A centralized inversion integrated machine according to claim 6, wherein the first end of the connection cavity (3) is fixedly connected with the inverter docking flange (9), and the second end is fixedly connected with the transformer docking flange (10).

Images