CN117355122A - Electrical apparatus box and air conditioning unit - Google Patents

Abstract

The invention discloses an electric appliance box and an air conditioning unit, wherein the electric appliance box comprises: the box body is internally provided with an accommodating space; the first partition plate is arranged in the accommodating space and divides the accommodating space into a first layer space and a second layer space which are communicated with each other; the multi-component device is arranged in the accommodating space and comprises a first component, and the heat dissipation priority of the first component is highest; the fan assembly is arranged in the first layer space and drives air flow to enable the first layer space and the second layer space to form a circulating air channel; the first component is arranged in the first layer space, and the fan assembly is arranged corresponding to the first component and radiates heat to the first component preferentially. The electric box and the air conditioning unit effectively solve the problem that the heat dissipation effect of the electric box in the prior art cannot meet the heat dissipation requirement under the closed structure.

Description

Electrical apparatus box and air conditioning unit

Technical Field

The invention relates to the technical field of electric boxes, in particular to an electric box and an air conditioning unit.

Background

Various heating devices including a PCB, a frequency conversion module, a power transformer, various scattered switching devices/voltage stabilizing devices and the like are arranged in an electric box of the air conditioner, and if high protection performance such as water resistance, dust resistance and the like is required to be ensured, the electric box structure is required to be sealed. However, the sealing is closed, and meanwhile, the problem of component temperature rise is caused by no external heat dissipation. Therefore, it is a difficult problem how to ensure that the temperature rise of the electronic components in the box does not exceed the standard under the condition that the electrical box is closed (the external ventilation holes are not formed).

There are some solutions in the prior art, such as adding an evaporator and a fan to the electrical box: according to the scheme, an evaporator box is additionally arranged outside the electric appliance box, the electric appliance box is regarded as an internal machine load, cold air is sucked out of the evaporator by a fan, and the cold air is blown into the electric appliance box to dissipate heat from components. Its advantages are high heat radiation effect, controllable temp of device, high cost, and high sealing performance.

Still another solution, the electrical box uses a microchannel heat sink and a fan: according to the scheme, an original refrigerant radiator in the electric box is changed into a micro-channel radiator, after the original refrigerant radiator is changed into the micro-channel radiator, the temperature of the refrigerant in the micro-channel is reduced, and then the air in the electric box is circulated through the micro-channel by using the fan, so that the temperature of the air in the electric box is reduced, and the heat dissipation of components is realized. The micro-channel radiator has the advantages of no condensed water, complex processing technology, excessive welding spots and easy coolant leakage, and the coolant temperature in the micro-channel cannot be reduced to be lower than the ambient temperature, so that the micro-channel radiator has a general radiating effect on components and is high in cost.

In conclusion, in the prior art, under the closed structure, the heat dissipation effect of the electrical box cannot meet the heat dissipation requirement.

Disclosure of Invention

The embodiment of the invention provides an electric box and an air conditioning unit, which are used for solving the problem that the heat dissipation effect of the electric box in the prior art cannot meet the heat dissipation requirement under a closed structure.

To achieve the above object, the present invention provides an electrical box comprising: the box body is internally provided with an accommodating space; the first partition plate is arranged in the accommodating space and divides the accommodating space into a first layer space and a second layer space which are communicated with each other; the multi-component device is arranged in the accommodating space and comprises a first component device, and the heat dissipation priority of the first component device is highest; the fan assembly is arranged in the first layer space, and drives air flow to enable the first layer space and the second layer space to form a circulating air channel; the first component is arranged in the first layer space, and the fan assembly is arranged corresponding to the first component and radiates heat to the first component preferentially.

Further, the multi-component device further comprises a second component device, and the heat dissipation priority of the second component device is lower than that of the first component device; the second component is arranged in the first layer space, the second component is arranged in the circulating air duct, and the air flow after heat dissipation of the first component flows through the second component.

Further, the method further comprises the following steps: a reactor located within the first layer space; the second partition plate is arranged in the first layer space and separates the reactor, and the space where the reactor is positioned is communicated with the second layer space; and the air flow after heat dissipation of the second component enters the second layer space after part of the air flow flows through the reactor, part of the air flow directly enters the second layer space, and part of the air flow flows back to the first layer space for internal circulation.

Further, the electrical box further comprises a first PCB and a second PCB which are arranged at intervals; the components of the first component are respectively connected to the first PCB and the second PCB;

the fan assembly comprises a first fan and a second fan, the first fan is arranged corresponding to the first PCB, and the second fan is arranged corresponding to the second PCB;

the air inlet of the first fan faces the first PCB, and the first fan blows air towards the second component;

the second fan directly blows air towards the second PCB, and the air flow part passing through the second PCB blows air towards the first PCB and enters the air inlet of the first fan.

Further, the second component comprises a plurality of common mode chokes, and the common mode chokes are distributed on a plurality of PCB boards.

Further, a circulation opening is formed between the first partition plate and the box body, and the first layer space and the second layer space are communicated through the circulation opening; the second component is positioned at the position of the circulation opening, the air flow passing through the second component enters the second layer space from the circulation opening, and the air flow in the second layer space returns to the air inlet of the second fan.

Further, the electrical box further comprises a third PCB and a fourth PCB which are arranged at intervals, and the common mode choke coil is respectively connected to the third PCB and the fourth PCB; the first fan directly blows air towards the third PCB board position; and one part of the air flow passing through the third PCB enters the second layer space through the fourth PCB, and the other part of the air flow directly enters the second layer space.

Further, a first air inlet opening is formed between the first partition plate and the box body, the first air inlet opening is arranged corresponding to the first fan, and the first air inlet opening avoids the capacitor on the first PCB.

Further, a second air inlet opening is formed between the first partition plate and the box body, the second air inlet opening is correspondingly arranged with the second fan, and the second air inlet opening is connected with the first air inlet opening;

the second fan is arranged at the edge position of the second PCB, and the second air inlet opening is positioned at the second fan.

According to another aspect of the present invention, there is provided an air conditioning unit including the above electrical box.

The electric box is internally provided with the first partition board, the first partition board divides a single space in the electric box into a first layer of space and a second layer of space which are communicated, a fan assembly is additionally arranged, a circulating air channel with strong convection is formed, and the circulating air channel dissipates heat of multiple components. Furthermore, the fan assembly is arranged corresponding to the first component, and the first component with the highest heat dissipation priority is subjected to preferential heat dissipation, so that the component with low temperature resistance and highest heat dissipation priority can be subjected to preferential cooling, and the heat dissipation requirement of the component is met. Other components with low temperature resistance and high heat dissipation priority can radiate heat in a stepped way in the circulating air duct, so that the components with low temperature resistance and the components with high temperature resistance can radiate heat fully, the heat radiation requirements of all the components are met, and the use stability of the electrical box is effectively improved.

Drawings

FIG. 1 is a schematic perspective view of an electrical box according to an embodiment of the present invention;

fig. 2 is a perspective schematic view of an internal structure of an electrical box according to an embodiment of the present invention;

FIG. 3 is a schematic view of the flow of wind fields in the first and second layer spaces of the electrical box according to an embodiment of the present invention;

FIG. 4 is a schematic view of the flow of wind fields in a portion of the first layer space and all of the second layer space of the electrical box according to an embodiment of the present invention; and

fig. 5 is a schematic view showing an internal structure of an electrical box according to an embodiment of the present invention in one direction;

fig. 6 is a schematic view of the internal structure of the electrical box in another direction according to the embodiment of the present invention;

fig. 7 is a schematic view of a part of the structure of an electrical box according to an embodiment of the present invention;

fig. 8 is a schematic layout diagram of a first component of the electrical box on a PCB board according to an embodiment of the present invention;

fig. 9 is a schematic structural view of a first partition of an electrical box according to an embodiment of the present invention;

fig. 10 is a schematic structural view of a first partition and a second partition of an electrical box according to an embodiment of the present invention.

Detailed Description

The invention will now be described in further detail with reference to the drawings and specific examples, which are not intended to limit the invention thereto.

Referring to fig. 1 to 10, according to an embodiment of the present invention, there is provided an electrical box including a box body 10, a first partition 21, a multi-component device, and a fan assembly 40, the box body 10 having an accommodating space formed therein; the first partition 21 is disposed in the accommodation space, and the first partition 21 divides the accommodation space into a first-layer space A1 and a second-layer space A2 that are communicated. The multiple components are arranged in the accommodating space, the multiple components comprise a first component 31, and the heat dissipation priority of the first component 31 is highest. The fan assembly 40 is disposed in the first layer space A1, and the fan assembly 40 drives air flow to form a circulating air channel between the first layer space A1 and the second layer space A2; the first component 31 is disposed in the first layer space A1, and the fan assembly 40 is disposed corresponding to the first component 31 and preferably dissipates heat to the first component 31.

In the electric box, a first partition plate is arranged in an inner closed space, the first partition plate divides a single space in the inner part into a first layer of space A1 and a second layer of space A2 which are communicated, and a fan assembly is additionally arranged, so that a circulating air channel with strong convection is formed, and the circulating air channel dissipates heat of a plurality of components. Furthermore, the fan assembly 40 is arranged corresponding to the first component 31, and the first component with the highest heat dissipation priority is subjected to preferential heat dissipation, so that the component with low temperature resistance and highest heat dissipation priority can be subjected to preferential cooling, and the heat dissipation requirement of the component is met. Other components with low temperature resistance and high heat dissipation priority can radiate heat in a stepped way in the circulating air duct, so that the components with low temperature resistance and the components with high temperature resistance can radiate heat fully, the heat radiation requirements of all the components are met, and the use stability of the electrical box is effectively improved.

The multi-component device further comprises a second component device 32, and the heat dissipation priority of the second component device 32 is lower than that of the first component device 31;

the second component 32 is disposed in the first layer space A1, the second component 32 is disposed in the circulation duct, and the air flow after heat dissipation by the first component 31 flows through the second component 32.

The second component 32 is also important, and although the heat dissipation priority of the second component is lower than that of the first component, heat dissipation is also required in time, so that the second component 32 is disposed downstream of the first component 31, and the air flow passing through the first component 31 dissipates heat through the second component.

The electric box further comprises a reactor 50 and a second partition board 22, wherein the reactor 50 is positioned in the first layer space A1; the second partition 22 is disposed in the first-layer space A1, the second partition 22 partitions the reactor 50, and the space where the reactor 50 is located communicates with the second-layer space A2;

the air flow after heat dissipation of the second component 32 flows partially through the reactor 50 into the second-layer space A2, partially directly into the second-layer space A2, and partially flows back into the first-layer space A1 for internal circulation.

The reactor is higher in temperature resistance, so that the third priority bit row is lower than the first component and the second component. As shown in fig. 4 and 10, two reactors 50 are located in the first-stage space A1 (lower-stage space), and the two reactors are isolated by a right-angle folded plate structure formed by two second separators 22, and the upper part of the space where the reactors are located is open and communicates with the second-stage space A2 (upper-stage space). The air flow after heat dissipation by the second component 32 partially flows through the upper part of the space where the reactor is located to remove heat, and then enters the second layer space A2. The advantage of setting like this lies in, can dispel the heat to the reactor, prevents that the reactor temperature from being too high, can also reduce the reactor heat and produce the influence to other components and parts of first layer space A1. Further, when the first-layer space A1 and the second-layer space A2 form a strong convection region, a weak convection region is formed at the junction between the two reactors and the second-layer space A2.

As shown in fig. 3 and 7, the electrical box further includes a first PCB 61 and a second PCB 62 disposed at intervals; the components of the first component 31 are respectively connected to the first PCB 61 and the second PCB 62;

the fan assembly 40 includes a first fan 41 and a second fan 42, the first fan 41 is disposed corresponding to the first PCB 61, and the second fan 42 is disposed corresponding to the second PCB 62;

the air inlet of the first fan 41 faces the first PCB 61, and the first fan 41 faces the second component 32;

the second fan 42 directly blows air toward the second PCB 62, and the air flow passing through the second PCB 62 is partially blown toward the first PCB 61 and enters the air inlet of the first fan 41.

Through the arrangement of the first fan and the second fan and the design of the air field, all the first component parts 31 arranged on the first PCB 61 and the second PCB 62 are subjected to the highest-priority blowing heat dissipation, and the heat of the first component parts 31 is blown away from the surface at the first time. Referring to fig. 8, the heat sources of the first component 31 are distributed on the first PCB board or the second PCB board, and the heat sources are also separately arranged to prevent the heat from concentrating to damage the components or the PCB boards. The components on the first PCB or the second PCB have the highest heat dissipation priority because the components control the operation of key components of the unit.

In this embodiment, the second component 32 includes a plurality of common mode chokes distributed on a plurality of PCBs. The second priority of heat dissipation of the common mode choke coil is that the common mode choke coil belongs to important parts in heat dissipation of the electric box, so that heat dissipation is performed preferentially.

Referring to fig. 4, a flow opening B1 is formed between the first partition 21 and the case 10, and the first space A1 and the second space A2 are communicated through the flow opening B1;

the second component 32 is located at the position of the ventilation opening B1, the air flow passing through the second component 32 enters the second-layer space A2 from the ventilation opening B1, and the air flow in the second-layer space A2 returns to the air inlet of the second fan 42.

The second component is arranged at the position of the circulation opening B1, so that heat dissipation of the second component is facilitated, the inner space of the electrical box is utilized to the greatest extent, and the heat dissipation and cooling efficiency is improved in a limited space.

Preferably, the electrical box further comprises a third PCB 63 and a fourth PCB 64 which are arranged at intervals, and the common mode choke coil is respectively connected to the third PCB 63 and the fourth PCB 64;

the first fan 41 directly blows air towards the position of the third PCB 63; a part of the airflow passing through the third PCB 63 flows through the fourth PCB 64 to enter the second-layer space A2, and another part directly enters the second-layer space A2.

With reference to fig. 3, through the design of the air inlet and the air outlet of the first fan 41 and the matching relationship between the third PCB 63 and the fourth PCB 64, the heat dissipation requirement of the common mode choke coil in the second component can be satisfied while the heat dissipation of the first component 32 is ensured.

Further preferably, a first air inlet opening 71 is formed between the first partition 21 and the box 10, the first air inlet opening 71 is disposed corresponding to the first fan 41, and the first air inlet opening 71 is away from the capacitor 311 on the first PCB 61.

As can be seen from fig. 4, 9 and 10, the design of the first air inlet opening 71 is to reserve an air inlet space for the first fan, and the height of the first air inlet opening needs to exceed the capacitance 311 (bus capacitor), so that air flow can directly enter the air inlet of the first fan without blocking the capacitance, the air inlet quantity is increased, and the heat dissipation efficiency is improved.

Preferably, a second air inlet opening 72 is formed between the first partition 21 and the box 10, the second air inlet opening 72 is disposed corresponding to the second fan 42, the second air inlet opening 72 is connected to the first air inlet opening 71, the second fan 42 is disposed at an edge position of the second PCB 62, and the second air inlet opening 72 is disposed at the second fan 42.

As can be seen from fig. 4, 9 and 10, the first partition 21 extends only to the lower edge of the second PCB, and the second air inlet opening 72 is designed to provide an air inlet space for the second fan, so as to increase the air output. The second air inlet 72 is only at the lower edge of the second PCB board, so that the lower layer forms beam current at the lower edge, and heat dissipation is better.

In this embodiment, the first layer space A1 is a lower layer space, and the second layer space A2 is an upper layer space. The second space A2 is used as an upper space in which a small amount of electric control components (not shown) with little heat generation are arranged, and the first space A1 is used as a lower space in which components with larger heat generation are arranged, including a first component and a second component. The upper and lower circulating flow fields are constructed by matching the partition plates in the electrical box with the placement positions of the fan assemblies and the air outlet angles, see fig. 3 and 4. Meanwhile, the distribution and the priority design of the heat sources are utilized to reduce the return air temperature, and meanwhile, the heat dissipation requirements of all the heat sources are considered.

The heat dissipation process of the internal air duct of the electric appliance box is as follows:

the air-out of the first fan 41 directly sends forced convection to the two common mode chokes, and the air-out of the second fan 42 can be better aligned to the heat source (part of the components of the first component) on the second PCB. The second fan 42 can effectively dissipate heat of all the components on the second PCB, and when the air flows upward, the air is blocked by the bus capacitor (one of the heat sources), wherein about 50% of the air flows forward in the x-axis direction and enters the air inlet of the first fan, that is, much of the air flows sent by the second fan also dissipates heat of the first PCB.

The first fan 41 continues to pump air upwards in relay, part of air quantity can pass through the right side of the bus capacitor, heat is dissipated to the common mode choke coil upwards, and air at the third PCB and the fourth PCB is promoted to rise to the upper layer of the electrical box. The air outlet of the first fan 41 mainly has three directions: a part of the air passes around the two common mode chokes to form circulation only at the lower layer (the first layer space A1) of the electric box, a part of the air passes through the upper layer (the second layer space A2) of the electric box to return air to the lower side respectively, and the other part of the air passes through the upper layer of the electric box to the upper layer of the reactor.

Because almost no heat source exists in the return air path of the two-layer space A2 and the return air is very dispersed, when the two airflows reach the lower side of the electric box, the temperature of the airflows is reduced, and the airflows reenter the lower layer (the first-layer space A1) of the electric box through the designed first air inlet opening and the second air inlet opening to dissipate heat of the heat source, so that the circulating air duct is realized.

The invention also provides an embodiment of the air conditioning unit, and the air conditioning unit comprises the electrical box of the embodiment.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or described herein.

Of course, the above is a preferred embodiment of the present invention. It should be noted that it will be apparent to those skilled in the art that several modifications and adaptations can be made without departing from the general principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.

Claims (10)

1. An electrical box, comprising:

the box body (10), the said box body (10) forms the accommodation space inside;

a first partition plate (21), wherein the first partition plate (21) is arranged in the accommodating space, and the accommodating space is divided into a first layer space (A1) and a second layer space (A2) which are communicated with each other by the first partition plate (21);

the multi-component device is arranged in the accommodating space and comprises a first component device (31), and the heat dissipation priority of the first component device (31) is highest;

a fan assembly (40), wherein the fan assembly (40) is arranged in the first layer space (A1), and the fan assembly (40) drives air flow to enable the first layer space (A1) and the second layer space (A2) to form a circulating air channel;

the first component (31) is arranged in the first layer space (A1), and the fan assembly (40) is arranged corresponding to the first component (31) and radiates heat to the first component (31) preferentially.

2. The electrical box according to claim 1, wherein,

the multi-component device further comprises a second component device (32), and the heat dissipation priority of the second component device (32) is lower than that of the first component device (31);

the second component (32) is arranged in the first layer space (A1), the second component (32) is arranged in the circulating air duct, and the air flow after heat dissipation of the first component (31) flows through the second component (32).

3. The electrical box of claim 2, further comprising:

-a reactor (50), said reactor (50) being located within said first layer space (A1);

a second separator (22), wherein the second separator (22) is arranged in the first layer space (A1), the second separator (22) separates the reactor (50), and the space where the reactor (50) is positioned is communicated with the second layer space (A2);

and one part of the air flow subjected to heat dissipation through the second component (32) flows through the reactor (50) to enter the second-layer space (A2), the other part directly enters the second-layer space (A2), and the other part flows back to the first-layer space (A1) for internal circulation.

4. The electrical box according to claim 2, wherein,

the electrical box further comprises a first PCB (61) and a second PCB (62) which are arranged at intervals; a plurality of components of the first component (31) are respectively connected to the first PCB (61) and the second PCB (62);

the fan assembly (40) comprises a first fan (41) and a second fan (42), the first fan (41) is arranged corresponding to the first PCB (61), and the second fan (42) is arranged corresponding to the second PCB (62);

an air inlet of the first fan (41) faces the first PCB (61), and the first fan (41) blows air towards the second component (32);

the second fan (42) directly blows towards the second PCB (62), and the air flow part passing through the second PCB (62) blows towards the first PCB (61) and enters the air inlet of the first fan (41).

5. The electrical box according to claim 4, wherein,

the second set of components (32) includes a plurality of common mode chokes distributed across a plurality of PCBs.

6. The electrical box according to claim 5, wherein,

a circulation opening (B1) is formed between the first partition plate (21) and the box body (10), and the first layer space (A1) and the second layer space (A2) are communicated through the circulation opening (B1);

the second component (32) is located at the position of the circulation opening (B1), air flow passing through the second component (32) enters the second layer space (A2) from the circulation opening (B1), and air flow in the second layer space (A2) returns to the air inlet of the second fan (42).

7. The electrical box according to claim 6, wherein,

the electrical box further comprises a third PCB (63) and a fourth PCB (64) which are arranged at intervals, and the common mode choke coil is respectively connected to the third PCB (63) and the fourth PCB (64);

the first fan (41) directly blows air towards the position of the third PCB (63); and one part of the air flow passing through the third PCB (63) flows through the fourth PCB (64) to enter the second-layer space (A2), and the other part directly enters the second-layer space (A2).

8. The electrical box according to claim 6, wherein,

first air inlet opening (71) is formed between first baffle (21) and box body (10), first air inlet opening (71) with first fan (41) correspond the setting, electric capacity (311) on first PCB board (61) are dodged to first air inlet opening (71).

9. The electrical box according to claim 8, wherein,

a second air inlet opening (72) is formed between the first partition plate (21) and the box body (10), the second air inlet opening (72) is arranged corresponding to the second fan (42), and the second air inlet opening (72) is connected with the first air inlet opening (71);

the second fan (42) is arranged at the edge position of the second PCB (62), and the second air inlet opening (72) is positioned at the second fan (42).

10. An air conditioning unit comprising the electrical box of any one of claims 1 to 9.