A heat dissipation sealing structure of a control box with a circuit board

Abstract

The utility model relates to a heat dissipation sealing structure of control box with circuit board, including box body, be provided with circuit board in the box body, be provided with aluminium heat dissipation spare on the circuit board, aluminium heat dissipation spare has heat dissipation channel, and the wall of box body is opened and has heat dissipation import, heat dissipation export, the both ends of heat dissipation channel and heat dissipation import, heat dissipation export sealed butt joint, the utility model reaches the beneficial effect is: good heat dissipation effect, excellent waterproof effect.

Description

Technical Field

[0001] This utility model relates to the field of control box technology with circuit board, and in particular to a heat dissipation and sealing structure for a control box with circuit board. Background Technology

[0002] In existing control boxes, circuit boards are housed inside the box; to increase heat dissipation, flat ventilation holes are usually made on the box. This makes it very easy for dust to accumulate inside the box, and its waterproof performance is even worse.

[0003] Some customers, due to the special operating environment, require both good heat dissipation and a certain degree of waterproofing. Currently, control boxes on the market are assembled and sealed with sealing rings, achieving relatively good waterproofing; some control boxes also achieve relatively good heat dissipation; however, they cannot simultaneously provide excellent waterproofing and excellent heat dissipation.

[0004] Based on this, our company has designed a new type of heat dissipation and sealing structure for the control box. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a heat dissipation and sealing structure for a control box with a circuit board, which solves the problem that ordinary control boxes cannot simultaneously achieve heat dissipation and waterproof performance, and has the functions of good heat dissipation and excellent waterproof performance.

[0006] The purpose of this utility model is achieved through the following technical solution: a heat dissipation and sealing structure for a control box with a circuit board, including a box body, and a circuit board disposed inside the box body;

[0007] The circuit board is equipped with an aluminum heat sink;

[0008] The aluminum heat sink has a heat dissipation channel, and a heat dissipation inlet and a heat dissipation outlet are opened on the wall of the box; the two ends of the heat dissipation channel are sealed and connected to the heat dissipation inlet and the heat dissipation outlet.

[0009] In a preferred embodiment of this application, sealing grooves are formed on the outer rings of both end faces of the heat dissipation channel, and sealing rings are placed in the sealing grooves. The heat dissipation channel is sealed and connected to the corresponding heat dissipation inlet and outlet through the sealing rings and the application of rubber sealing grease. The rubber sealing grease forms an oil film at the gaps, thereby preventing water from entering through the gaps.

[0010] Furthermore, an expanded zinc component is placed at the bottom of the sealing groove. When the expanded zinc component expands due to heat, it compresses the sealing ring to form a sealing structure. The expanded zinc component is made of zinc metal, and zinc has a greater coefficient of thermal expansion than aluminum. When heat is generated in the heat dissipation channel, the zinc expands and presses the sealing ring against the wall of the box, ensuring a good sealing effect.

[0011] In a preferred embodiment of this application, the heat dissipation channel has two openings, one larger and one smaller. The smaller opening connects to the heat dissipation inlet, and the larger opening connects to the heat dissipation outlet, forming a structure that facilitates the outward flow of hot air within the heat dissipation channel. When cooler air enters the heat dissipation channel, it is heated and expands. The expanded air then exits along the larger opening.

[0012] In a preferred embodiment of this application, the heat dissipation channel is provided with multiple heat sinks, with gaps forming between the heat sinks along the direction from the heat dissipation inlet to the heat dissipation outlet. The heat sinks improve the heat dissipation effect.

[0013] In a preferred embodiment of this application, the box body includes a lower box and an upper cover, and a circuit board is installed on the inner bottom surface of the lower box; the end face of the upper edge of the lower box is stepped, the upper cover is fastened on the step, and an L-shaped sealing strip is provided at the step; after the lower box and the upper cover are assembled by screws, the assembled lower box forms the bottom wall and side wall of the box body, and the upper cover forms the upper wall of the box body.

[0014] In a preferred embodiment of this application, the aluminum heat sink is also fixed to the top cover vertically by screws.

[0015] In a preferred embodiment of this application, the housing is threaded with a cable connector, which is stepped; a locking nut is screwed onto the cable connector, and the locking nut and the step of the ladder clamp the wall of the housing, with an O-ring provided at the step of the cable connector. This improves the sealing effect at the cable connector.

[0016] This utility model has the following advantages:

[0017] (1) The box itself has a good sealing effect after assembly;

[0018] The box body is assembled with a lower box and an upper cover using an L-shaped sealing strip. Compared with the traditional flat sealing strip, the L-shaped sealing strip can improve the sealing effect. The cable connectors are sealed with O-rings, which can also ensure the sealing effect.

[0019] (2) While ensuring waterproofing, it can also effectively dissipate heat from the circuit board.

[0020] An aluminum heat sink is attached to the circuit board. The aluminum heat sink has a heat dissipation channel, which is aligned with the heat dissipation inlet and outlet on the housing. Heat dissipation blades are also provided inside the heat dissipation channel.

[0021] During operation, the heat generated on the circuit board is transferred to the aluminum heat sink, and then cooled by the outside cold air at the heat dissipation channel (the traditional heat dissipation design only opens heat dissipation holes on the box, which can dissipate heat but has poor waterproof performance).

[0022] Because outside air / water only flows within the heat dissipation channel and does not enter the box, it has good waterproof performance;

[0023] (3) The heat dissipation channel of the aluminum heat sink and the docking structure of the heat dissipation inlet and outlet on the box can ensure the sealing effect at the docking point;

[0024] A sealing groove is made circumferentially on the outer side of the heat dissipation channel. An expanded zinc component and a sealing ring are placed in the sealing groove, with the expanded zinc component located at the bottom of the sealing groove. At room temperature, there is a rubber sealing silicone grease film in the gap between the sealing ring and the wall of the box, thus ensuring the sealing effect. When there is a certain amount of heat in the heat dissipation channel, both the aluminum heat sink and the sealing ring will undergo thermal expansion deformation. Since their coefficients of thermal expansion are different, slight displacement changes may occur. However, when the expanded zinc component expands after being heated, it can press the sealing ring against the wall of the box, thus ensuring a good seal even at temperatures higher than room temperature.

[0025] (4) The two ends of the heat dissipation channel are larger at one end and smaller at the other, which facilitates the flow of most of the internal hot air in one direction and improves the heat dissipation effect; the design of the heat sink can also improve the heat dissipation effect. Attached Figure Description

[0026] Figure 1 This is a structural schematic diagram of the present invention viewed from the front.

[0027] Figure 2 This is a structural schematic diagram of the present invention viewed from the rear.

[0028] Figure 3 This is a schematic diagram of the structure between the circuit board and the aluminum heat sink.

[0029] Figure 4 This is a structural diagram showing the circuit board and the aluminum heat sink from another angle.

[0030] Figure 5 This is a schematic diagram of the structure of an aluminum heat sink.

[0031] Figure 6 This is a schematic diagram of the aluminum heat sink from another angle.

[0032] Figure 7 A schematic diagram of the aluminum heat sink from a bottom-view angle;

[0033] Figure 8 This is a schematic diagram of the cable connector structure;

[0034] In the diagram: 1-box body, 11-heat dissipation inlet, 12-heat dissipation outlet, 13-lower box, 14-top cover, 2-circuit board, 3-aluminum heat sink, 31-heat dissipation channel, 32-heat sink, 5-expanded zinc plate, 6-cable connector, 61-locking nut, 62-O-ring. Detailed Implementation

[0035] The present invention will be further described below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description.

[0036] It should be noted that the orientation or positional relationship indicated by terms such as "left" and "right" is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of this invention is usually placed in during use, or the orientation or positional relationship that is commonly understood by those skilled in the art. Such terms are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0037] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0038] like Figures 1-7 As shown, the heat dissipation and sealing structure of the control box with circuit board proposed in this embodiment includes a box body 1 and an aluminum heat sink 3; a circuit board 2 is provided inside the box body 1, and a heat dissipation inlet 11 and a heat dissipation outlet 12 are opened on the wall of the box body 1.

[0039] Among them, an aluminum heat sink 3 is attached to the circuit board 2, and the aluminum heat sink 3 has a heat dissipation channel 31; the two ends of the heat dissipation channel 31 are sealed and connected to the heat dissipation inlet 11 and the heat dissipation outlet 12, and the three are in a straight line after the connection.

[0040] Furthermore, multiple heat sinks 32 are provided in the heat dissipation channel 31, and gaps are formed between the heat sinks 32 along the direction from the heat dissipation inlet 11 to the heat dissipation outlet 12;

[0041] During operation, the heat generated on the circuit board 2 is transferred to the aluminum heat sink 3 and the heat sink 32; the outside cold air is connected through the same straight line "heat inlet 11-heat channel 31-heat outlet 12", which can enter the heat channel 31 well and flow quickly along the straight path, thereby achieving a good heat dissipation effect.

[0042] Since the cold air from the outside flows along the heat dissipation channel 31, it does not come into contact with the components inside the box 1; similarly, if there is water in the outside, it will not affect the components inside the box, thus providing good waterproofing.

[0043] See Figures 3-6 To further improve the heat dissipation effect of the heat dissipation channel 31, the two ends of the heat dissipation channel 31 are wider at one end and narrower at the other. The smaller channel opening connects to the heat dissipation inlet 11, and the larger channel opening connects to the heat dissipation outlet 12. When cold air from the outside enters the heat dissipation channel 31, it is heated and expands. More of the expanded air is discharged along the larger channel opening; this facilitates the flow of cold air from the outside into the heat dissipation channel 31 from the smaller channel opening.

[0044] See Figure 1 and Figure 2 As shown, in order to prevent water from entering through the gaps in the assembly of the box body 1, the box body 1 includes a lower box 13 and an upper cover 14. A circuit board 2 is installed on the inner bottom surface of the lower box 13. The end face of the upper edge of the lower box 13 is stepped, and the upper cover 14 is fastened on the stepped platform. An L-shaped sealing strip is provided at the stepped platform.

[0045] After the lower box 13 and the upper cover 14 are assembled by screws, the lower box 13 forms the bottom wall and side wall of the box body 1, and the upper cover 14 forms the upper wall of the box body 1; the L-shaped sealing strip has a better sealing effect than the ordinary flat strip.

[0046] See Figure 8 To prevent water from entering through the gaps in the cable connector 6 on the housing 1, a cable connector 6 is threaded onto the housing 1. The cable connector 6 is stepped. A locking nut 61 is screwed onto the cable connector 6. The locking nut and the step of the step clamp the wall of the housing 1. An O-ring 62 is provided at the step of the cable connector 6.

[0047] See Figure 5 and Figure 6 In order to ensure a sealed connection between the heat dissipation channel 31 and the heat dissipation inlet 11 and the heat dissipation outlet 12, a sealing groove is provided on both end faces of the aluminum heat sink 3 and on the outer ring of the heat dissipation channel 31. An expanded zinc component 5 and a sealing ring are placed in the sealing groove, and the expanded zinc component 5 is located at the bottom of the groove.

[0048] During installation, apply rubber sealing grease to press the sealing ring against the wall of the box 1; then use screws to pass through the top cover 12 to fix the aluminum heat sink 3 in the vertical direction.

[0049] During operation, at room temperature, a rubber sealing silicone grease film exists in the gap between the sealing ring and the wall of the box, thus ensuring the sealing effect. When there is a certain amount of heat in the heat dissipation channel, the expansion zinc part will expand after being heated, and after expansion, it will press the sealing ring against the wall of box 1 to ensure a good seal at temperatures higher than room temperature.

[0050] It should be noted that, for reference Figure 7In this embodiment, the aluminum heat sink 3 is a snap-on cover, which is attached to the circuit board 2 through a sealing gasket opening; and there are no electronic components on the circuit board 2 at the snap-on position.

[0051] When the entire heat dissipation and sealing structure of the control box with circuit boards is in operation:

[0052] The upper cover 14 and lower box 13 of the box body 1 are sealed by an L-shaped sealing gasket, and the cable connector 6 is sealed by an O-ring 62; the end of the aluminum heat sink 3 is sealed to the wall of the box body 1 by an expanded zinc part 5, a sealing ring, and rubber sealing grease; thus ensuring a good sealing effect.

[0053] When heat is generated on circuit board 2, the heat directly enters the heat dissipation channel 31; outside cold air enters the heat dissipation channel 31 and exchanges heat with the heat. The cold air is heated into hot air, and the hot air escapes along the heat dissipation channel 31 to other places outside, thus taking away the heat.

[0054] During the cooling process, the cold air will not come into contact with the electronic components inside the housing 1; similarly, when the outside environment is watery, the water will only flow along the heat dissipation channel 31 and will not enter the housing 1.

[0055] The above embodiments only illustrate preferred implementation methods, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model.

Claims

1. A heat dissipation and sealing structure for a control box with a circuit board, comprising a box body (1) and a circuit board (2) disposed inside the box body (1), characterized in that: An aluminum heat sink (3) is provided on the circuit board (2); The aluminum heat sink (3) has a heat dissipation channel (31) and a heat dissipation inlet (11) and a heat dissipation outlet (12) are opened on the wall of the box (1); the two ends of the heat dissipation channel (31) are sealed and connected to the heat dissipation inlet (11) and the heat dissipation outlet (12).

2. The heat dissipation and sealing structure of a control box with a circuit board according to claim 1, characterized in that: The heat dissipation channel (31) has a sealing groove on the outer ring of both ends, and a sealing ring (4) is placed in the sealing groove. The heat dissipation channel (31) is sealed and connected to the corresponding heat dissipation inlet (11) and heat dissipation outlet (12) by a sealing ring (4) and a rubber sealing grease.

3. The heat dissipation and sealing structure of a control box with a circuit board according to claim 2, characterized in that: An expanded zinc component (5) is placed at the bottom of the sealing groove. When the expanded zinc component (5) is heated and expands, it squeezes the sealing ring (4) to form a sealing structure.

4. The heat dissipation and sealing structure of a control box with a circuit board according to claim 1, characterized in that: The heat dissipation channel (31) has two ends with one end larger and the other end smaller. The smaller channel opening is connected to the heat dissipation inlet (11), and the larger channel opening is connected to the heat dissipation outlet (12), forming a structure that facilitates the outward flow of hot air in the heat dissipation channel (31).

5. The heat dissipation and sealing structure of a control box with a circuit board according to claim 1, characterized in that: The heat dissipation channel (31) is provided with a plurality of heat dissipation fins (32), and gaps are formed between the heat dissipation fins (32) along the direction from the heat dissipation inlet (11) to the heat dissipation outlet (12).

6. The heat dissipation and sealing structure of a control box with a circuit board according to claim 1, characterized in that: The box body (1) includes a lower box (13) and an upper cover (14), and a circuit board (2) is installed on the inner bottom surface of the lower box (13). The upper edge of the lower box (13) is stepped, and the upper cover (14) is fastened on the stepped platform. An L-shaped sealing strip is provided at the stepped platform. After the lower box (13) and the upper cover (14) are assembled by screw locking, the lower box (13) forms the bottom wall and side wall of the box body (1), and the upper cover (14) forms the upper wall of the box body (1).

7. The heat dissipation and sealing structure of a control box with a circuit board according to claim 1, characterized in that: The aluminum heat sink (3) is also fixed to the top cover (14) in the vertical direction by screws.

8. The heat dissipation and sealing structure of a control box with a circuit board according to claim 1, characterized in that: The box (1) is threaded with a cable connector (6), which is stepped. The cable connector (6) is screwed with a locking nut (61), which clamps the wall of the box (1) with the step of the ladder, and an O-ring (62) is provided at the step of the cable connector (6).

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