Electrical box, air conditioner

Abstract

The present invention provides an electrical box and an air conditioner. The electrical box includes a box body, on which a first type of components and a second type of components are arranged, wherein the heat generation of the first type of components is higher than the heat generation of the second type of components, the second type of components are arranged inside the box body and are upstream of the heat dissipation airflow flow direction inside the box body, and the first type of components are arranged inside the box body and are downstream of the heat dissipation airflow flow direction inside the box body. According to an electrical box and an air conditioner of the present invention, the second type of components and the first type of components are arranged in different regions upstream and downstream of the heat dissipation airflow, which can significantly improve the temperature rise in the box.

Description

Technical Field

[0001] The invention belongs to the technical field of electric appliance box manufacturing, and in particular relates to an electric appliance box and an air conditioner. Background Art

[0002] Industries involving various electronic equipment applications include the air conditioning industry. Since various power components inside the electrical box generate heat when powered on, heat dissipation in the electrical box has become a very important issue in the industry.

[0003] Natural convection cooling is widely used in the field of heat dissipation due to its advantages of low cost and high reliability. However, as electronic equipment develops towards miniaturization and integration, the heat generation power and heat flux density are increasing. The traditional natural convection method has a very low air flow rate and a low heat transfer coefficient, which makes the heat dissipation problem more serious.

[0004] In the existing natural convection heat dissipation electrical box design, the design is mostly based on whether the wiring in the electrical box is convenient, the separation of strong and weak electricity, whether the electromagnetic shielding is qualified, as well as weight reduction, screw tightening position, process and other aspects. The heat dissipation of the electrical box is mostly achieved by setting corresponding heat dissipation fins, and very little attention is paid to the differences in heat consumption of various components inside the electrical box for reasonable layout inside the box. The inventor has found through research that arranging the components in the box according to the differences in heat consumption of the components can significantly improve the temperature rise in the box. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to provide an electrical box and an air conditioner, in which the second type of components and the first type of components are arranged in the upstream and downstream of the heat dissipation airflow in different areas, which can significantly improve the temperature rise in the box.

[0006] In order to solve the above problems, the present invention provides an electrical box, including a box body, on which a first type of components and a second type of components are arranged, wherein the heat generated by the first type of components is higher than the heat generated by the second type of components, the second type of components are arranged on the inside of the box body and are upstream of the flow direction of the heat dissipation airflow inside the box body, and the first type of components are arranged on the inside of the box body and are downstream of the flow direction of the heat dissipation airflow inside the box body.

[0007] Preferably, the temperature resistance of the first category components is higher than the temperature resistance of the second category components.

[0008] Preferably, heat dissipation fins are provided on the outside of the box body, and third-type components are also provided on the inside of the box body. The heat flux density of the third-type components is higher than the heat flux density of the first-type components and the second-type components. The third-type components are bonded and connected to the first wall of the box body corresponding to the heat dissipation fins.

[0009] Preferably, the third category components are located in a middle area of ​​the first wall facing the inner side of the box body.

[0010] Preferably, the first category of components includes at least one of a PFC inductor, an AC filter inductor, a DC filter inductor, and a DC contactor, and / or the second category of components includes capacitors and relays, and / or the third category of components includes an IGBT power module.

[0011] Preferably, there are gaps between the components of the first category and / or the second category, and the through-extending direction of the gaps is parallel to the flow direction of the heat dissipation airflow.

[0012] Preferably, a fan is further provided in the box body, and the box body has a first installation area and a second installation area corresponding to the first category components and the second category components respectively, and the fan is located adjacent to the first installation area and the second installation area.

[0013] Preferably, the box body is an aluminum-plastic box body; and / or the box body is a sealed structure.

[0014] Preferably, the box body has a length L in the flow direction of the heat dissipation airflow, and a width W in a direction perpendicular to the flow direction of the heat dissipation airflow, and 1≤L / W≤2.

[0015] The present invention also provides an air conditioner, comprising the above-mentioned electrical appliance box.

[0016] The present invention provides an electrical box and an air conditioner, in which electronic components to be installed in the electrical box are first classified into first-category components and second-category components according to their heat output, and on this basis, the first-category components with high heat output are arranged downstream of the second-category components with low heat output, thereby effectively preventing the prior art from preventing the components with high heat output from being located upstream of the heat dissipation airflow, causing the heat dissipation airflow temperature to be high and thus causing adverse effects on the heat dissipation of the components with low heat output, thereby facilitating controlling the temperature rise in the electrical box and ensuring the performance reliability of the electronic components. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the internal component layout of an electrical box in the prior art;

[0018] Figure 2 A schematic diagram of the internal component layout of an electrical box according to an embodiment of the present invention;

[0019] Figure 3 An electrical box and an Figure 1 The comparison chart of temperature measurement test results in the electrical box is shown.

[0020] The reference numerals are:

[0021] 1. Box body; 11. Heat sink fins; 21. PFC inductor; 22. AC filter inductor; 23. DC filter inductor; 24. DC contactor; 31. Capacitor; 32. Relay; 41. IGBT power module; 5. Fan; 1', box body; 21', PFC inductor; 22', AC filter inductor; 23', DC filter inductor; 24', DC contactor; 31', capacitor; 32', relay; 41', IGBT power module; 5', fan. DETAILED DESCRIPTION

[0022] Figure 1 FIG. 1 shows a schematic diagram of the layout of components (electronic components) in an electrical box in the prior art. As can be seen from the figure, the box body 1' is provided with 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'. The arrangement of these components is not arranged in accordance with the optimal heat dissipation requirements, resulting in a high temperature rise in the electrical box body 1', which is not conducive to the performance and reliability of the electronic components. It is found that the specific reasons for the high temperature rise are as follows: (1) Components with high heat generation, such as the AC filter inductor 22', the DC filter inductor 23', and the DC contactor 24' are arranged on the air inlet side of the fan 5', while components with low heat generation, such as the capacitor 31' and the relay 32', are arranged on the air inlet side of the fan 5'. On the air outlet side, this causes the heat dissipation airflow to be always in a relatively high temperature range as the fan 5' is driven and circulated. The heat of the components with high heat generation located upstream of the heat dissipation airflow has an adverse effect on the heat dissipation of the components with low heat generation located downstream of the heat dissipation airflow. (2) In order to achieve the compactness of the structure of the box body 1', multiple components such as the PFC inductor 21' and the capacitor 31' are close to each other, and the heat dissipation area is small, which is not conducive to the flow of the heat dissipation airflow. (3) In the flow direction of the heat dissipation airflow, there is shielding between the upstream and downstream components. For example, the AC filter inductor 22' is on the same straight line, resulting in a large temperature difference between the components arranged in front and behind. (4) The box body 1' is designed as a long and narrow structure, and the thermal cascade phenomenon is serious at the heat dissipation fins, which is not conducive to natural convection heat dissipation. (5) Components with high heat flux density, such as the IGBT power module 41', are arranged at the edge of the wall of the box body 1', and the diffusion thermal resistance is large, which is not conducive to their heat dissipation.

[0023] In order to at least improve the heat dissipation effect of the electrical box in the prior art and thus control the temperature rise inside the electrical box, the inventors proposed the technical solution of the present invention after conducting relevant research, and combined with reference to Figure 2As shown, the arrows in the figure show the approximate flow direction of the heat dissipation airflow. According to an embodiment of the present invention, an electrical box is provided, including a box body 1, on which a first type of components and a second type of components are arranged, wherein the heat generation of the first type of components is higher than the heat generation of the second type of components, the second type of components are arranged inside the box body 1 and are located upstream of the heat dissipation airflow flow direction inside the box body 1, and the first type of components are arranged inside the box body 1 and are located downstream of the heat dissipation airflow flow direction inside the box body 1. In this technical solution, the electronic components to be installed in the electrical box are first classified into first type of components and second type of components according to the heat generation, and on this basis, the first type of components with large heat generation are arranged downstream of the second type of components with small heat generation, thereby effectively eliminating the existing technology in which the components with large heat generation are located upstream of the heat dissipation airflow, resulting in a high temperature of the heat dissipation airflow and thus causing an adverse effect on the heat dissipation of the components with small heat generation, thereby facilitating the control of the temperature rise in the electrical box and ensuring the performance reliability of the electronic components.

[0024] Best of all, the temperature resistance of the first category of components is higher than that of the second category of components, that is, components with high heat generation and strong temperature resistance are placed downstream of the heat dissipation airflow. In this way, the stability of the working performance of the components can still be guaranteed when the heat dissipation airflow accumulates on the downstream side.

[0025] The first type of components includes 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 includes at least one of a capacitor 31 and a relay 32 .

[0026] Preferably, the outer side of the box body 1 is provided with a heat dissipation fin 11, and the inner side of the box body 1 is also provided with a third type of components, the heat flux density of the third type of components is higher than the heat flux density of the first type of components and the second type of components, the third type of components is bonded and connected to the first wall of the box body 1 corresponding to the heat dissipation fin 11, and the third type of components includes an IGBT power module 41. In this technical solution, the third type of components is bonded to the first wall, so that the heat dissipation fin 11 can be used to conduct heat to the third type of components more efficiently to achieve heat dissipation. Furthermore, the third type of components is located in the middle area of ​​the first wall facing the inner side of the box body 1. Placing the third type of components in the middle area can effectively reduce the heat dissipation thermal resistance between the third type of components and the heat dissipation fin 11, thereby meeting the heat dissipation requirements of the third type of components.

[0027] There are gaps between each component in the first category of components and / or the second category of components, and the through-extension direction of the gaps is parallel to the flow direction of the heat dissipation airflow, thereby ensuring that the heat dissipation airflow can flow between each component, increasing the heat exchange area of ​​each component, and improving the heat dissipation effect.

[0028] It can be understood that the box body 1 has a first installation area and a second installation area corresponding to the first type of components and the second type of components respectively. The box body 1 is also provided with a fan 5, and the fan 5 is located at the junction of the first installation area and the second installation area. At this time, the heat dissipation airflow in the box body 1 flows from the second installation area to the first installation area under the action of the fan 5.

[0029] The box body 1 is an aluminum-plastic box body; and / or, the box body 1 is a sealed structure.

[0030] The box body 1 has a length L in the flow direction of the heat dissipation airflow and a width W in the direction perpendicular to the flow direction of the heat dissipation airflow, 1≤L / W≤2. In this technical solution, the length-to-width ratio of the box body 1 is limited, which effectively prevents the occurrence of thermal cascade caused by the excessive length-to-width ratio of the box body 1, which is beneficial to improving the natural convection heat dissipation effect of the heat dissipation fins 11.

[0031] In order to verify the actual temperature rise of the electrical box using the technical solution of the present invention, the inventor compared it with the electrical box in the prior art ( Figure 1 ) were tested and compared, and the temperature results of the measuring points are as follows Figure 3 As shown in the figure, the original solution refers to Figure 1 The solution shown, the optimized solution is Figure 2 The technical solution of the present invention is shown as follows: Figure 3 It can be seen that the temperature of the IGBT power module, the most core component in the electrical box, is reduced by 3-6°C, the temperature of the PFC inductor is reduced by 4-5°C, and the temperature of the capacitor is reduced by 2-4°C; the temperature of other components and the internal air remains basically the same, and the temperature rise of the components inside the electrical box is significantly improved.

[0032] According to an embodiment of the present invention, there is also provided an air conditioner, comprising the above-mentioned electrical appliance box.

[0033] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0034] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. An electrical box, characterized in that: The invention comprises a box body (1), wherein the box body (1) is provided with a first type of components and a second type of components, wherein the heat generation of the first type of components is higher than the heat generation of the second type of components, the second type of components are arranged on the inner side of the box body (1) and are located upstream of the heat dissipation airflow flow direction of the inner side of the box body (1), and the first type of components are arranged on the inner side of the box body (1) and are located downstream of the heat dissipation airflow flow direction of the inner side of the box body (1); the outer side of the box body (1) is provided with a heat dissipation fin (11), and the inner side of the box body (1) is also provided with a third type of components, wherein the heat flux density of the third type of components is higher than that of the first type of components. The third type of components are fitted and connected to the first wall of the box body (1) corresponding to the heat dissipation fins (11), and the third type of components are located in the middle area of ​​the first wall facing the inner side of the box body (1); a fan (5) is also provided in the box body (1), and the box body (1) has a first installation area and a second installation area corresponding to the first type of components and the second type of components, respectively, the fan (5) is located at the junction of the first installation area and the second installation area, and the third type of components are located between the second type of components and the fan (5).

2. The electrical box according to claim 1, characterized in that: The temperature resistance of the first category of components is higher than that of the second category of components.

3. The electrical box according to claim 1, characterized in that: The first category of components includes 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 category of components includes at least one of a capacitor (31) and a relay (32), and / or the third category of components includes an IGBT power module (41).

4. The electrical box according to claim 1, characterized in that: There are gaps between the components of the first category and / or the second category, and the through-extending direction of the gaps is parallel to the flow direction of the heat dissipation airflow.

5. 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 sealed structure.

6. The electrical box according to claim 1, characterized in that: The box body (1) has a length L in the flow direction of the heat dissipation airflow, and a width W in a direction perpendicular to the flow direction of the heat dissipation airflow, and 1≤L / W≤2.

7. An air conditioner, comprising an electrical box, characterized in that: The electrical appliance box is the electrical appliance box according to any one of claims 1 to 6.

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