CN111655008A

CN111655008A - Electrical apparatus box, air conditioner

Info

Publication number: CN111655008A
Application number: CN202010588896.5A
Authority: CN
Inventors: 刘怀灿; 于博; 王京; 赵万东
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2020-06-24
Filing date: 2020-06-24
Publication date: 2020-09-11

Abstract

The invention provides an electric appliance box and an air conditioner. The electrical box comprises a box body, be equipped with first type components and parts, second type components and parts on the box body, wherein the calorific capacity of first type components and parts is higher than the calorific capacity of second type components and parts, second type components and parts set up in the box body is inboard and be in the upper reaches of the inboard heat dissipation air current flow direction of box body, first type components and parts set up in the inboard of box body just first type components and parts are in the low reaches of the inboard heat dissipation air current flow direction of box body. According to the electrical box and the air conditioner, the second type of components and the first type of components are arranged on the upstream and the downstream of the heat dissipation airflow in a regional mode, and the temperature rise condition in the box can be obviously improved.

Description

Electrical apparatus box, air conditioner

Technical Field

The invention belongs to the technical field of manufacturing of electrical boxes, and particularly relates to an electrical box and an air conditioner.

Background

The industries related to various electronic equipment applications comprise the air conditioning industry, and the heat dissipation of the electric appliance box becomes a problem which is very important in the industry because various power components inside the electric appliance box are electrified and generate heat.

The natural convection heat dissipation mode has the advantages of low cost and high reliability, and is widely applied to the heat dissipation field. However, as electronic devices are miniaturized and integrated, the heating power and the heat flux density are increased, the air flow rate is very low and the heat transfer coefficient is low in the conventional natural convection mode, so that the heat dissipation problem is more serious.

In the design of the existing natural convection heat dissipation electric appliance box, the design is mostly based on the aspects of whether wiring in the electric appliance box is convenient, strong and weak current separation, whether electromagnetic shielding is qualified, weight reduction, screw fastening positions, processes and the like, the heat dissipation of the electric appliance box is mostly realized by arranging corresponding heat dissipation fins, the difference of all components in the electric appliance box in the aspect of heat consumption is rarely concerned to carry out reasonable layout in the box, and the inventor finds that the components in the box are arranged according to the heat consumption difference of the components, so that the temperature rise condition in the box can be obviously improved.

Disclosure of Invention

Therefore, the technical problem to be solved by the present invention is to provide an electrical box and an air conditioner, wherein the second type of components and the first type of components are arranged upstream and downstream of the heat dissipation airflow in a partitioned manner, so that the temperature rise condition in the box can be obviously improved.

In order to solve the above problems, the present invention provides an electrical box, which includes a box body, wherein the box body is provided with a first type component and a second type component, wherein the heat productivity of the first type component is higher than that of the second type component, the second type component is arranged inside the box body and is located at the upstream of the flowing direction of the heat dissipation airflow inside the box body, the first type component is arranged inside the box body and is located at the downstream of the flowing direction of the heat dissipation airflow inside the box body.

Preferably, the temperature resistance of the first type of component is higher than that of the second type of component.

Preferably, the outside of box body is equipped with radiating fin, the box body inboard still is equipped with third type components and parts, the heat flux density of third type components and parts is higher than the heat flux density of first type components and parts and second type components and parts, third type components and parts laminating connect in the box body with on the first wall body that radiating fin corresponds.

Preferably, the third component is located in a middle area of the first wall body on the side facing the inner side of the box body.

Preferably, the first component includes at least one of a PFC inductor, an AC filter inductor, a DC filter inductor, and a DC contactor, and/or the second component includes a capacitor, a relay, and/or the third component includes an IGBT power module.

Preferably, gaps are formed among the first type components and/or the second type components, and the through extending direction of the gaps is parallel to the flowing direction of the heat dissipation airflow.

Preferably, a fan is further arranged in the box body, a first mounting area and a second mounting area which are in one-to-one correspondence with the first type of component and the second type of component are arranged in the box body, and the fan is located at the position where the first mounting area is adjacent to the second mounting area.

Preferably, the box body is an aluminum plastic box body; and/or the box body is a sealing structure.

Preferably, the box body has a length L in the flowing direction of the heat dissipation airflow and a width W in the direction perpendicular to the flowing direction of the heat dissipation airflow, and L/W is more than or equal to 1 and less than or equal to 2.

The invention also provides an air conditioner which comprises the electrical box.

According to the electrical box and the air conditioner, the electronic components to be installed in the electrical box are firstly classified according to the heat productivity to form the first type of components and the second type of components, on the basis, the first type of components with large heat productivity are arranged at the downstream of the second type of components with small heat productivity, and therefore the adverse influence of high temperature of radiating airflow caused by the fact that the components with large heat productivity are located at the upstream of the radiating airflow in the prior art on the heat radiation of the components with small heat productivity is effectively avoided, the temperature rise in the electrical box is favorably controlled, and the performance reliability of the electronic components is guaranteed.

Drawings

Fig. 1 is a schematic layout diagram of internal components of an electrical box in the prior art;

fig. 2 is a schematic layout diagram of internal components of the electrical box according to the embodiment of the present invention;

fig. 3 is a comparison chart of the temperature measurement test results of the electric box adopting the technical scheme of the invention and the electric box shown in fig. 1.

The reference numerals are represented as:

1. a box body; 11. a heat dissipating fin; 21. a PFC inductance; 22. an AC filter inductance; 23. a DC filter inductor; 24. a DC contactor; 31. a capacitor; 32. a relay; 41. an IGBT power module; 5. a fan; 1', a box body; 21', PFC inductance; 22', an AC filter inductance; 23', a DC filter inductor; 24', a dc contactor; 31', a capacitor; 32', a relay; 41', an IGBT power module; 5', fan.

Detailed Description

Fig. 1 shows a layout schematic diagram of components (electronic components) in an electrical box in the prior art, and it can be seen from the diagram that a PFC inductor 21 ', an AC filter inductor 22', a DC filter inductor 23 ', a DC contactor 24', a capacitor 31 ', a relay 32', an IGBT power module 41 ', and a fan 5' are arranged in a box body 1 ', and the arrangement of the above components is not necessarily arranged according to the optimal requirement of heat dissipation, so that the temperature rise in the box body 1' of the electrical box is high, which is not beneficial to performance exertion and reliability guarantee of the electronic components, and researches find that the specific reason for the high temperature rise is in the following aspects: (1) components with large heat productivity such as the AC filter inductor 22 ', the DC filter inductor 23', the DC contactor 24 'and the like are arranged on the air inlet side of the fan 5', while components with small heat productivity such as the capacitor 31 'and the relay 32' are arranged on the air outlet side of the fan 5 ', which causes the heat dissipation airflow to be always in a high temperature range along with the driving cycle of the fan 5', and the heat of the components with large heat productivity on the upstream of the heat dissipation airflow has a negative influence on the heat dissipation of the components with small heat productivity on the downstream of the heat dissipation airflow; (2) for the compactness of the box body 1 ', a plurality of components such as the PFC inductor 21 ' and the capacitor 31 ' are close to each other, so that the heat dissipation area is small, and the heat dissipation airflow is not favorable to flow; (3) in the flowing direction of the heat dissipation airflow, the upstream and downstream components have shielding conditions, for example, the AC filter inductors 22' are located on the same straight line, which results in a large temperature difference between the components arranged in front and behind; (4) the box body 1' is designed to be a long and narrow structure, and the heat cascade phenomenon at the radiating fins is serious, so that the box body is not beneficial to natural convection heat dissipation; (5) the components with high heat flux density, such as the IGBT power module 41 ', are arranged at the edge of the wall surface of the case 1', and the diffusion thermal resistance is large, which is not favorable for heat dissipation.

In order to at least improve the heat dissipation effect of the electrical box in the prior art and further control the internal temperature rise of the electrical box, after performing related research, the inventor proposes a technical scheme of the present invention, and with reference to fig. 2, an arrow in the figure shows an approximate flow direction of a heat dissipation airflow, according to an embodiment of the present invention, there is provided an electrical box, including a box body 1, where a first type of component and a second type of component are disposed on the box body 1, where the heat generation amount of the first type of component is higher than that of the second type of component, the second type of component is disposed inside the box body 1 and upstream of the flow direction of the heat dissipation airflow inside the box body 1, the first type of component is disposed inside the box body 1, and the first type of component is downstream of the flow direction of the heat dissipation airflow inside the box body 1. According to the technical scheme, the electronic components to be installed in the electrical box are firstly classified according to the heat productivity to form the first type of components and the second type of components, on the basis, the first type of components with large heat productivity are arranged at the downstream of the second type of components with small heat productivity, and therefore the adverse influence of high temperature of heat dissipation airflow and heat dissipation on the components with small heat productivity caused by the fact that the components with large heat productivity are located at the upstream of the heat dissipation airflow in the prior art is effectively avoided, and therefore the temperature rise in the electrical box is favorably controlled, and the performance reliability of the electronic components is guaranteed.

Preferably, the temperature resistance of the first type of component is higher than that of the second type of component, that is, the component with large self-heating value and strong temperature resistance is arranged at the downstream of the heat dissipation airflow, so that the stability of the working performance of the component can still be ensured under the condition that the heat dissipation airflow is accumulated at the downstream side.

The first type of components comprise at least one of a PFC inductor 21, an AC filter inductor 22, a DC filter inductor 23 and a DC contactor 24, and/or the second type of components comprise at least one of a capacitor 31 and a relay 32.

Preferably, the outside of box body 1 is equipped with radiating

fin

11, 1 inboard of box body still is equipped with third type of components and parts, the heat flux density of third type of components and parts is higher than the heat flux density of first type of components and parts and second type of components and parts, the laminating of third type of components and parts connect in box body 1 with on the first wall body that radiating fin 11 corresponds, third type of components and parts include IGBT power module 41, among this technical scheme, will the laminating of third type of components and parts in on the first wall body, and then can pass through radiating fin 11 is right third type of components and parts carry out more efficient heat-conduction and realize the heat dissipation. Furthermore, the third component is located in a middle area of the first wall body facing to the inner side of the box body 1, and the third component is arranged in the middle area, so that the heat dissipation thermal resistance between the third component and the heat dissipation fins 11 can be effectively reduced, and the heat dissipation requirements of the third component are further met.

Gaps are formed among the first type components and the second type components, and the through extending direction of the gaps is parallel to the flowing direction of the heat dissipation airflow, so that the heat dissipation airflow can flow among the components, the heat exchange area of each component is increased, and the heat dissipation effect is improved.

It can be understood that the box body 1 is internally provided with a first mounting area and a second mounting area which are respectively in one-to-one correspondence with the first type of components and the second type of components, the box body 1 is internally provided with a fan 5, the fan 5 is positioned at the adjacent position of the first mounting area and the second mounting area, and at the moment, the heat dissipation airflow in the box body 1 flows to the first mounting area from the second mounting area under the action of the fan 5.

The box body 1 is an aluminum plastic box body; and/or the box body 1 is a sealing structure.

The box body 1 is provided with a length L in the flowing direction of the heat dissipation airflow and a width W in the direction perpendicular to the flowing direction of the heat dissipation airflow, wherein L/W is more than or equal to 1 and less than or equal to 2.

In order to verify the actual temperature rise condition of the electric box adopting the technical scheme of the invention, the inventor performs experimental comparison on the temperature rise condition of the electric box (shown in figure 1) in the prior art, the temperature measurement result is shown in figure 3, in the figure, the original scheme refers to the scheme shown in figure 1, and the optimized scheme refers to the technical scheme adopting the invention shown in figure 2, and as can be seen from figure 3, the temperature of an IGBT power module serving as the most core component in the electric box is reduced by 3-6 ℃, the temperature of a PFC inductance is reduced by 4-5 ℃, and the temperature of a capacitance is reduced by 2-4 ℃; the temperature of other components and the temperature of the internal air are basically kept flat, and the temperature rise condition of the components in the electric box is obviously improved.

According to an embodiment of the invention, an air conditioner is also provided, which comprises the electrical box.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides an electrical box, its characterized in that, includes box body (1), be equipped with first type components and parts, second type components and parts on box body (1), wherein the calorific capacity of first type components and parts is higher than the calorific capacity of second type components and parts, second type components and parts set up in box body (1) inboard just is in the upper reaches of box body (1) inboard heat dissipation air current flow direction, first type components and parts set up in the inboard just of box body (1) first type components and parts are in the low reaches of box body (1) inboard heat dissipation air current flow direction.

2. The electrical box of claim 1, wherein the temperature resistance of the first type of component is higher than the temperature resistance of the second type of component.

3. The electrical box according to claim 1 or 2, characterized in that a heat dissipation fin (11) is arranged on the outer side of the box body (1), a third type of component is further arranged on the inner side of the box body (1), the heat flux density of the third type of component is higher than that of the first type of component and that of the second type of component, and the third type of component is attached to the first wall body corresponding to the heat dissipation fin (11) of the box body (1).

4. The electrical box according to claim 3, characterized in that the third component is located in the middle area of the first wall body on the side facing the inside of the box body (1).

5. The electrical box according to claim 3 or 4, characterized in that the first type of components comprises at least one of a PFC inductance (21), an AC filter inductance (22), a DC filter inductance (23), a DC contactor (24), and/or the second type of components comprises at least one of a capacitance (31), a relay (32), and/or the third type of components comprises an IGBT power module (41).

6. The electrical box according to claim 3, wherein gaps are formed between the first type of component and/or the second type of component, and the through extending direction of the gaps is parallel to the flowing direction of the heat dissipation airflow.

7. The electrical box according to claim 1, characterized in that a fan (5) is further arranged in the box body (1), a first mounting area and a second mounting area which are in one-to-one correspondence with the first type of component and the second type of component are arranged in the box body (1), and the fan (5) is located at the adjacent position of the first mounting area and the second mounting area.

8. The electrical box according to claim 1, characterized in that the box body (1) is an aluminum-plastic box body; and/or the box body (1) is a sealing structure.

9. The electrical apparatus box according to claim 1, wherein the box body (1) has a length L in the direction of the flow of the heat dissipating air flow, and has a width W in the direction perpendicular to the direction of the flow of the heat dissipating air flow, L/W being 1 ≦ L ≦ 2.

10. An air conditioner comprising an electrical box, characterized in that the electrical box is as claimed in any one of claims 1 to 9.