A power supply housing

Abstract

The utility model relates to the field of switching power supplies, and in particular to a power supply housing, comprising a housing, wherein an accommodating space for placing a PCB board is arranged on the housing, at least four mounting positions are arranged on the bottom of the housing, at least two mounting positions are provided with mounting through holes, machine screw columns are penetrated through the mounting through holes, and the machine screw columns are provided with internal threads; the remaining mounting positions are provided with mounting convex hulls protruding outward, and the mounting convex hulls are provided with internal thread channels; the PCB board is placed on the machine screw columns and the mounting convex hulls, the machine screw columns of the mounting through holes are located at both ends of the diagonal of the PCB board to play a main limiting role, the mounting convex hulls are distributed at the remaining peripheral positions of the bottom of the PCB board to play a supporting auxiliary limiting role, and the thread pitch of the machine screw is controlled to be 0.4-0.7mm, so as to effectively improve the stability of the connection between the PCB board and the housing, and reduce the frequency of the screen flashing phenomenon caused by the loosening of the PCB board due to vibration during use.

Description

Technical Field

[0001] The utility model relates to the field of switching power supplies, in particular to a power supply housing. Background Art

[0002] A switching power supply is a high-frequency power conversion device, also known as a switching power supply or a switching converter. Its main function is to convert electrical energy from one form to another, especially to convert the input AC power or DC power into a DC voltage that meets the requirements of the equipment. The working principle of a switching power supply is to convert the input DC power into a high-frequency AC power through a high-speed switching tube, and then process it through a transformer, a rectifier circuit, and a filter circuit to finally obtain a stable low-ripple DC voltage for power supply. In this process, the switching power supply switches the input voltage into a pulse signal at a high frequency through the switching action of the switch tube, and then converts it into a DC voltage output through a rectifier and filter circuit.

[0003] The input and output ends of the switching power supply are generally connected in series with a high-voltage ceramic capacitor to the earth, which is mainly used to prevent high-frequency interference at the input and output ends. In full-color LED display applications, one leg of the high-voltage ceramic capacitor is connected to the earth pad, and the other leg is connected to the input or output end; then the earth pad is locked with the power supply housing to connect them to the ground. However, the bottom of the existing power supply housing is stamped to form a convex connection structure, which is locked with self-tapping screws, but the locking effect of the self-tapping bolt plus the convex structure is poor. The switching power supply has slight vibrations when in use, and it is easy to loosen after long-term use, resulting in poor contact of the high-voltage ceramic capacitor. The high-frequency interference generated by the switching power supply will cause the LED screens of different colors to produce afterglow, thereby causing the screen to flicker. Utility Model Content

[0004] The utility model aims to provide a power supply housing, aiming to improve the problem that the fixing effect of the convex bulge structure plus the self-tapping screws is poor, the loosening phenomenon is easy to occur, and the LED screen flashes.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A power supply housing comprises a housing, wherein the housing is provided with a receiving space for placing a PCB board.

[0007] The bottom of the shell is provided with at least four mounting positions, at least two of the mounting positions are provided with mounting through holes, the mounting through holes are distributed on the diagonal lines of the bottom of the shell, the mounting through holes are penetrated by machine screw columns, the machine screw columns extend upward into the accommodation space, the machine screw columns are interference fitted with the mounting through holes, and the machine screw columns are provided with internal threads;

[0008] The remaining installation positions are provided with installation convex bumps protruding outward, and the installation convex bumps are provided with internal thread channels;

[0009] The PCB board is placed on the machine screw column and the mounting convex bump, and the PCB board is threadedly connected with the machine screw column and the mounting convex bump at the bottom of the shell through the machine screw; the thread pitch of the machine screw is 0.4-0.7mm.

[0010] Furthermore, it also includes an upper cover, and at least two connecting plates extending downward are arranged on both sides of the upper cover;

[0011] The inner upper part of the shell has at least two connection positions, and the connection positions and the connection plates correspond one to one. At least one connection position is provided with a first connection hole, and at least one connection plate is provided with a second connection hole. The second connection hole and the first connection hole are connected to each other, and the first connection hole and the second connection hole are penetrated by fixing parts, and clamping parts are arranged between the remaining connection plates and the connection positions.

[0012] Furthermore, the clamping member includes a clamping protrusion, and a clamping groove communicating with the outside is opened on one side of the corresponding connecting plate. The opening directions of the clamping grooves are the same, and the clamping protrusion is embedded in the clamping groove.

[0013] Furthermore, the upper cover is provided with honeycomb heat dissipation holes.

[0014] Furthermore, an upwardly protruding heat sink is provided on the inner bottom surface of the shell, a buffer sheet is fitted and fixed on the heat sink, and the buffer sheet and the PCB board are fitted to each other.

[0015] Furthermore, a plurality of strip-shaped heat dissipation channels arranged in sequence are provided on the side surface of the shell, and the bottoms of the strip-shaped heat dissipation channels extend to the bottom surface of the shell.

[0016] Furthermore, an inwardly recessed boss is provided on the outer side surface of the shell, the boss extends into the interior of the accommodation space, a MOS tube is attached to the boss, a pin of the MOS tube extends downward and is electrically connected to the PCB board, and there is a spacing between the pin of the MOS tube and the inner side surface of the shell;

[0017] A limiting plate is fixed on the boss, and the limiting plate is in contact with the outer side surface of the MOS tube.

[0018] Furthermore, a heat dissipation opening is provided on the top of the boss.

[0019] Furthermore, a spring washer is sleeved on the machine screw, and two side surfaces of the spring washer are respectively in contact with the top of the machine screw and the top of the PCB board.

[0020] After adopting the above technical solution, the utility model has the following advantages compared with the background technology:

[0021] 1. In this solution, the machine screw columns for installing through holes are located at both ends of the diagonal of the PCB board to play a major limiting role, and the installation convex bumps are distributed at the remaining peripheral positions at the bottom of the PCB board to play a supporting auxiliary limiting role, and the thread pitch of the machine screw is controlled at 0.4-0.7mm, which effectively improves the stability of the connection between the PCB board and the housing, and reduces the frequency of screen flashing caused by loosening of the PCB board due to vibration during use.

[0022] 2. In this solution, the spring washer is used to buffer the PCB board between the machine screws and the PCB board, further reducing the possibility of the PCB board loosening due to vibration during use, thereby ensuring the stability of the power supply during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A top view of the housing of the power supply device of the utility model;

[0024] Figure 2 This is a front view of the housing of the power supply of the utility model;

[0025] Figure 3 This is a rear view of the housing of the power supply of the utility model;

[0026] Figure 4 It is a side view of the housing of the power supply unit of the utility model;

[0027] Figure 5 It is a schematic diagram of the side cross-sectional structure of the housing of the power supply housing of the utility model;

[0028] Figure 6 It is a top view of the cover of the power supply housing of the utility model;

[0029] Figure 7 This is a front view of the cover of the power supply housing of the utility model;

[0030] Figure 8 It is a side view of the cover of the power supply housing of the utility model.

[0031] Description of reference numerals:

[0032] 1. Shell; 11. Accommodating space; 12. Mounting position; 13. Mounting through hole; 14. Machine screw column; 141. Protruding eaves; 142. Internal thread; 15. Mounting convex bump; 151. Internal thread channel; 16. Groove; 17. Heat dissipation platform; 18. Strip heat dissipation channel; 19. Boss; 191. Heat dissipation port; 20. Connection position; 201. Snap-on convex block; 202. First connection hole;

[0033] 3. Upper cover; 31. Connecting plate; 311. Connecting groove; 312. Second connecting hole; 32. Honeycomb heat dissipation hole. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0035] In addition, it should be noted that the terms "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element of the present invention must have a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0036] When an element is referred to as being “fixed to” or “disposed on” or “provided on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0037] Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.

[0038] Example

[0039] Please refer to Figure 1-8As shown, this embodiment provides a power supply housing, including a housing 1 and an upper cover 3, and the housing 1 is provided with a receiving space 11 for placing a PCB board (not shown in the drawings). The bottom of the housing 1 is provided with at least four mounting positions 12, wherein at least two mounting positions 12 are provided with mounting through holes 13, and the mounting through holes 13 are distributed on the diagonal line of the bottom of the housing 1; the remaining mounting positions 12 are provided with mounting convex bumps 15 protruding outward. A machine thread screw column 14 is passed through the mounting through hole 13, and the machine thread screw column 14 extends upward into the receiving space 11. The machine thread screw column 14 is provided with an internal thread 142, and the mounting convex bump 15 is provided with an internal thread channel 151, and the machine thread screw column 14 and the mounting convex bump 15 are fixedly connected to the PCB board through the internal thread 142 and the internal thread channel 151 respectively. The machine thread screw column 14 and the mounting through hole 13 are interference-fitted, ensuring that the machine thread screw column 14 and the bottom of the housing 1 have good connection strength, and ensuring the stability of the connection between the housing 1 and the PCB board during the use of the power supply. Please refer to Figure 5As shown, in this embodiment, an inwardly recessed groove 16 is provided on the bottom surface of the housing 1, and the groove 16 surrounds the through hole opening of the installation through hole 13. The bottom of the machine screw column 14 is provided with an outwardly protruding convex 141, and the convex 141 is embedded in the groove 16. The groove 16 positions the machine screw column 14 to ensure that the extension direction of the machine screw column 14 is perpendicular to the bottom of the housing 1. In this embodiment, the top surface of the machine screw column 14 and the top surface of the installation convex bump 15 are located on the same horizontal plane, and the groove 16 limits the machine screw column 14 to prevent the machine screw column 14 from extending too far toward the accommodating space 11, affecting the accuracy of the top surface position of the machine screw column 14, thereby ensuring the stability of the PCB board installation. The PCB board is placed on the machine screw column 14 and the installation convex 15. The PCB board is threadedly connected to the machine screw column 14 and the installation convex 15 at the bottom of the housing 1 through the machine screw. The same PCB board can be threadedly connected to the installation convex 15 through self-tapping screws. The machine screw column 14 plays a main fixing role, and the installation convex 15 plays an auxiliary fixing role, which effectively reduces the cost. The thread pitch of the machine screw is 0.4-0.7mm. In this embodiment, the thread pitch of the machine screw is 0.5mm. Similarly, the thread pitch of the machine screw can also be 0.4mm or 0.7mm. A smaller thread pitch is set to maximize the stability of the connection between the machine screw and the machine screw column 14. In this embodiment, the number of mounting positions 12 is five, the number of mounting through holes 13 is two, and the number of mounting protrusions is three. Among them, two mounting through holes 13 are respectively opened at the two ends of the diagonal at the bottom of the housing 1. During connection, the machine screw columns 14 of the mounting through holes 13 are located at both ends of the diagonal of the PCB board and play a major limiting role. The mounting convex bumps 15 are distributed at the remaining peripheral positions at the bottom of the PCB board and play a supporting auxiliary limiting role. The thread pitch of the machine screw is controlled at X, which effectively improves the stability of the connection between the PCB board and the housing 1 and reduces the frequency of screen flashing caused by loosening of the PCB board due to vibration during use.

[0040] The machine screw is provided with a spring washer (not shown in the attached figure), and the two sides of the spring washer are respectively in contact with the top of the machine screw and the top of the PCB. The spring washer is between the machine screw and the PCB to buffer the PCB, further reducing the possibility of the PCB being loosened due to vibration during use, thereby ensuring the stability of the power supply during use.

[0041] Please refer to Figure 1As shown, a heat sink 17 protruding upward is provided on the inner bottom surface of the housing 1, and a buffer sheet is fixed on the heat sink 17, and the buffer sheet and the PCB board are mutually attached. In this embodiment, the heat sink 17 corresponds to the position of the large components on the PCB board, and the heat sink 17 supports the large components through the buffer sheet to prevent the large components from vibrating during use and affecting the working stability of the PCB board. At the same time, the large components are raised to increase the distance between the components and the bottom of the housing 1, which is convenient for heat dissipation.

[0042] Please refer to Figure 1-3 As shown, a plurality of strip-shaped heat dissipation channels 18 are arranged in sequence on the side of the housing 1, and the bottom of the strip-shaped heat dissipation channel 18 extends to the bottom surface of the housing 1. On the premise of ensuring the good structural strength of the housing 1, the strip-shaped heat dissipation channel 18 extends to the bottom surface of the housing 1, maximizing the heat dissipation drive and improving the heat exchange efficiency between the inside and outside of the housing 1.

[0043] Please refer to Figure 1-5 As shown, an inwardly recessed boss 19 is provided on the outer surface of the shell 1, and the boss 19 extends to the inside of the accommodating space 11. A MOS tube is attached to the boss 19, and the pins of the MOS tube extend downward and are electrically connected to the PCB board. There is a spacing between the pins of the MOS tube and the inner side surface of the shell 1. A limiting plate is fixed on the boss 19, and the limiting plate and the outer side surface of the MOS tube are attached to each other. The limiting plate limits the MOS tube to ensure the stability of the MOS tube installed on the boss 19. The boss 19 controls the position of the MOS tube. In this embodiment, the thickness of the boss 19 is 3.3mm, which ensures that there is a gap between the pins of the MOS tube and the inner side surface of the shell 1, avoiding the sparking problem caused by insufficient creepage distance between the pins of the MOS tube and the inner wall of the shell 1. In this embodiment, a heat dissipation port 191 is provided on the top of the boss 19 to reduce the temperature of the boss 19, thereby achieving the purpose of cooling the MOS tube.

[0044] Please refer to Figure 6-8As shown, at least two connecting plates 31 extending downward are provided on both sides of the upper cover 3; the inner upper part of the housing 1 has at least two connecting positions 20, the connecting positions 20 and the connecting plates 31 correspond to each other, at least one connecting position 20 is provided with a first connecting hole 202, at least one connecting plate 31 is provided with a second connecting hole 312, the second connecting hole 312 and the first connecting hole 202 are connected to each other, the first connecting hole 202 and the second connecting hole 312 are penetrated by fixing members, and the remaining connecting plates 31 and the connecting positions 20 are provided with a clamping member. In this embodiment, the number of connecting plates 31 and the number of connecting positions 20 are both six; one of the six connecting positions 20 is provided with a first connecting hole 202, and one of the six connecting plates 31 is provided with a second connecting hole 312, and the first connecting hole 202 and the second connecting hole 312 correspond to each other. One position is fixedly connected, and the other positions are detachably limited. During assembly, only one fixing part needs to be installed and fixed. Under the premise of ensuring the connection stability between the upper cover 3 and the shell 1, the assembly difficulty is minimized and the assembly efficiency is improved. Similarly, two connection positions 20 and the connection plate 31 can be provided with the first connection hole 202 and the second connection hole 312, or even more connection positions 20 and the connection plate 31 can be provided with the first connection hole 202 and the second connection hole 312, so as to achieve a better fixing effect according to the assembly requirements.

[0045] The clamping member includes a clamping protrusion 201, and a clamping groove 311 communicating with the outside is opened on one side of the corresponding connecting plate 31. The opening direction of the clamping groove 311 is the same, and the protrusion is embedded in the clamping groove 311. During the assembly process, the clamping protrusion 201 enters the clamping groove 311 from the same direction, the assembly difficulty is low, and the assembly efficiency is high. The clamping groove 311 limits the clamping protrusion 201 to prevent the upper cover 3 from being separated from the outer shell from the direction of the five connecting plates 31, which affects the covering effect.

[0046] The upper cover 3 is provided with honeycomb heat dissipation holes 32 , which are located above the PCB board, so as to facilitate heat exchange between the top of the PCB board and the outside, thereby achieving a good cooling effect.

[0047] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A power supply housing, characterized in that: The device comprises a housing, wherein the housing is provided with a receiving space for placing a PCB board. The bottom of the shell is provided with at least four mounting positions, at least two of the mounting positions are provided with mounting through holes, the mounting through holes are distributed on the diagonal lines of the bottom of the shell, the mounting through holes are penetrated by machine screw columns, the machine screw columns extend upward into the accommodation space, the machine screw columns are interference fitted with the mounting through holes, and the machine screw columns are provided with internal threads; The remaining installation positions are provided with installation convex bumps protruding outward, and the installation convex bumps are provided with internal thread channels; The PCB board is placed on the machine screw column and the mounting convex bump, and the PCB board is threadedly connected with the machine screw column and the mounting convex bump at the bottom of the shell through the machine screw; the thread pitch of the machine screw is 0.4-0.7mm.

2. The power supply housing according to claim 1, characterized in that: It also includes an upper cover, and at least two connecting plates extending downward are arranged on both sides of the upper cover; The inner upper part of the shell has at least two connection positions, and the connection positions and the connection plates correspond one to one. At least one connection position is provided with a first connection hole, and at least one connection plate is provided with a second connection hole. The second connection hole and the first connection hole are connected to each other, and the first connection hole and the second connection hole are penetrated by fixing parts, and clamping parts are arranged between the remaining connection plates and the connection positions.

3. The power supply housing according to claim 2, characterized in that: The clamping member comprises a clamping protrusion, and a clamping groove communicating with the outside is opened on one side of the corresponding connecting plate. The opening directions of the clamping grooves are the same, and the clamping protrusion is embedded in the clamping groove.

4. The power supply housing according to claim 2, characterized in that: The upper cover is provided with honeycomb heat dissipation holes.

5. The power supply housing according to claim 1, characterized in that: An upwardly protruding heat sink is provided on the inner bottom surface of the shell, a buffer sheet is fixedly attached to the heat sink, and the buffer sheet and the PCB board are attached to each other.

6. The power supply housing according to claim 1, characterized in that: A plurality of strip-shaped heat dissipation channels arranged in sequence are provided on the side surface of the shell, and the bottoms of the strip-shaped heat dissipation channels extend to the bottom surface of the shell.

7. The power supply housing according to claim 1, characterized in that: An inwardly recessed boss is provided on the outer side of the shell, the boss extends to the inside of the accommodation space, a MOS tube is attached to the boss, a pin of the MOS tube extends downward and is electrically connected to the PCB board, and there is a distance between the pin of the MOS tube and the inner side of the shell; A limiting plate is fixed on the boss, and the limiting plate is in contact with the outer side surface of the MOS tube.

8. The power supply housing according to claim 7, characterized in that: A heat dissipation opening is provided on the top of the boss.

9. The power supply housing according to claim 1, characterized in that: A spring washer is sleeved on the machine screw, and two side surfaces of the spring washer are respectively in contact with the top of the machine screw and the top of the PCB board.

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