Vehicle-mounted direct-current switching power supply

Abstract

The utility model discloses a vehicle-mounted direct-current switching power supply, which relates to the technical field of switching power supplies and comprises a power supply box, a bottom plate connected with a vehicle and a screw inserted in a screw hole, a threaded hole is formed in the bottom plate, a plurality of positioning blocks are uniformly distributed on the periphery of the power supply box, springs are fixedly connected with the bottoms of the positioning blocks, and the springs are connected with the power supply box. A counterbore is formed in the positioning block, a screw sleeve is vertically and slidably installed in the counterbore, a screw hole is formed in the center of the screw sleeve, a limiting groove is formed in the top of the screw sleeve, and a limiting piece is fixed to the outer wall of the screw. According to the utility model, the screw cannot rotate through the limitation of the limiting sheet, the bolt is prevented from loosening or falling off due to bumping or irregular vibration, and the spring at the bottom of the power supply box can also provide buffering and damping effects for the whole power supply box, so that the impact on internal elements of the power supply box is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of switching power supplies, in particular to a vehicle-mounted direct current switching power supply. Background Art

[0002] The basic principle of the vehicle-mounted DC switching power supply is to use the high-speed switching of the switch tube to convert DC power into high-frequency AC power, and then obtain the required output voltage or current through circuits such as transformers and rectification and filtering.

[0003] At present, the existing vehicle-mounted switching power supplies are mostly fixed with screws during installation. However, the situation during vehicle driving is complex and changeable. Long-term bumps during driving may cause the screws to loosen or even fall off, which may cause the switching power supply to have the risk of disconnection, affecting normal use. Utility Model Content

[0004] The purpose of the utility model is to provide a vehicle-mounted DC switching power supply to solve at least one technical problem existing in the above-mentioned prior art.

[0005] To achieve the above object, the utility model provides the following technical solutions: a vehicle-mounted DC switching power supply, comprising a power box and a bottom plate connected to the vehicle, wherein the bottom plate is provided with a threaded hole, a plurality of positioning blocks are evenly distributed around the power box, a spring is fixedly connected to the bottom of the positioning block, a countersunk hole is provided in the positioning block, a screw sleeve is vertically slidably installed in the countersunk hole, a screw hole is provided in the center of the screw sleeve, a limiting groove is provided on the top, and the cross section of the limiting groove is a regular polygon;

[0006] It also includes a screw rod inserted into the screw rod hole, a limiting piece is fixed on the outer wall of the screw rod, and the cross section of the limiting piece is the same as the cross section of the limiting groove.

[0007] Preferably, four positioning blocks are provided, corresponding to the four corners of the power box respectively.

[0008] Preferably, a ring groove is provided on the top of the limiting plate, and a pull ring is rotatably installed in the ring groove.

[0009] Preferably, a spring sleeve is fixed to the bottom of the positioning block, and the spring sleeve is on the outer ring of the spring sleeve.

[0010] Preferably, a flat key groove is formed on the inner wall of the countersunk hole, and a flat key which can slide in the flat key groove is fixed on the outer wall of the screw sleeve.

[0011] Preferably, the cross-section of the limiting groove and the limiting piece is a regular hexagon.

[0012] Preferably, the top notch of the flat keyway is flush with the top of the positioning block.

[0013] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0014] The utility model prevents the screw rod from rotating by limiting the position limiting plate, thereby preventing the bolt from loosening or falling off due to bumps or irregular vibrations. At the same time, the spring at the bottom of the power box can also provide buffering and shock absorption effects for the power box as a whole, thereby avoiding impact on the internal components of the power box. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a side perspective structural schematic diagram of the utility model;

[0016] Figure 2 It is a front structural schematic diagram of the utility model;

[0017] Figure 3 For this utility model Figure 2 Partial cross-sectional view along AA;

[0018] Figure 4 It is an exploded schematic diagram of the internal structure of the positioning block of the utility model.

[0019] In the figure: 1. power box; 2. positioning block; 3. bottom plate; 4. spring sleeve; 5. spring; 6. threaded hole; 7. screw; 8. screw sleeve; 9. flat keyway; 10. countersunk hole; 11. flat key; 12. screw hole; 13. limiting groove; 14. limiting plate; 15. ring groove; 16. pull ring. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figures 1 to 4 The utility model provides a technical solution: a vehicle-mounted DC switching power supply, comprising a power box 1 and a bottom plate 3 connected to a vehicle, a threaded hole 6 is provided in the bottom plate 3, and the characteristics are: a plurality of positioning blocks 2 are evenly distributed around the power box 1, a spring 5 is fixedly connected to the bottom of the positioning block 2, a countersunk hole 10 is provided in the positioning block 2, a screw sleeve 8 is vertically slidably installed in the countersunk hole 10, a screw hole 12 is provided in the center of the screw sleeve 8, a limiting groove 13 is provided on the top of the screw sleeve 8, and the cross section of the limiting groove 13 is a regular polygon and also includes a screw 7 inserted in the screw hole 12, a limiting piece 14 is fixed on the outer wall of the screw 7, and the cross section of the limiting piece 14 is the same as the cross section of the limiting groove 13;

[0022] During installation, the screw rod 7 can be inserted into the screw sleeve 8, and the screw sleeve 8 and the screw rod 7 can be placed in the countersunk hole 10 together. At this time, the limiting piece 14 is inserted into the limiting groove 13 to prevent the screw rod 7 from moving further downward, and the screw sleeve 8 is embedded in the countersunk hole 10 to fix the limiting groove 13. The mutual coordination and positioning of each component not only increases the structural stability, but also facilitates removal during disassembly or installation, and is flexible to assemble;

[0023] Then place the above components in the positioning block 2, align the spring 5 with the threaded hole 6, press the power box 1 to compress the spring 5, so that the thread at the end of the screw 7 is inserted into the threaded hole 6, and the limiting piece 14 slides out of the limiting groove 13, releases the rotation lock of the screw 7, and then rotates the screw 7 by external force to screw it into the threaded hole 6, and loosens the power box 1. Under the action of the spring 5, the upward movement of the positioning block 2 will drive the screw sleeve 8 to move upward, so that the limiting piece 14 is re-embedded in the limiting groove 13, and the limiting piece 14 is locked;

[0024] In this way, the screw 7 cannot rotate by restricting the limit plate 14, thereby preventing the bolt from loosening or falling off due to bumps or irregular vibrations. At the same time, the spring 5 at the bottom of the power box 1 can also provide a buffering and shock-absorbing effect for the power box 1 as a whole, avoiding impact on the internal components of the power box 1.

[0025] Furthermore, four positioning blocks 2 are provided, corresponding to four corners of the power box 1 respectively.

[0026] By fixing the four sides of the power box 1 to increase its stability, an even number of 6 or 8 can be set and symmetrically distributed on both sides of the power box 1.

[0027] Furthermore, a ring groove 15 is formed on the top of the limiting piece 14 , and a pull ring 16 is rotatably installed in the ring groove 15 .

[0028] When the screw rod 7 is rotated, the pull ring 16 can be rotated, which is more convenient to use. In addition, the pull ring 16 can be rotated into the ring groove 15 through the rotating shaft when idle, which reduces space occupation and provides certain protection for the fragile pull ring 16.

[0029] Furthermore, a spring sleeve 4 is fixed to the bottom of the positioning block 2 , and a spring 5 is sleeved on the outer ring of the spring sleeve 4 .

[0030] The spring sleeve 4 can fix the spring 5 on its outer ring to prevent the center of gravity of the spring 5 from shifting slightly when it is vibrated, thereby failing to provide shock-absorbing protection for the power box 1 .

[0031] Furthermore, a flat key groove 9 is formed on the inner wall of the countersunk hole 10 , and a flat key 11 which can slide in the flat key groove 9 is fixed on the outer wall of the screw sleeve 8 .

[0032] After the flat key 11 slides into the flat key slot 9 under the action of the spring 5, the screw sleeve 8 cannot rotate, further improving the self-locking effect.

[0033] Furthermore, the cross-sections of the limiting groove 13 and the limiting piece 14 are regular hexagons.

[0034] Reduce the angle and space required for twisting, and reduce the difficulty of operation.

[0035] Furthermore, the top notch of the flat key slot 9 is flush with the top of the positioning block 2 .

[0036] The screw sleeve 8 is fully inserted into the positioning block 2 and the top plane is flush with the top of the positioning block 2.

[0037] The standard parts used in this embodiment can be purchased directly from the market, and the non-standard structural components recorded in the specification and the drawings can also be directly processed according to the existing technical common sense. At the same time, the connection method of each component adopts the mature conventional means in the prior art, and the machinery, parts and equipment all adopt the conventional models in the prior art, so no specific description will be given here.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A vehicle-mounted DC switching power supply, comprising a power supply box (1) and a bottom plate (3) connected to a vehicle, wherein a threaded hole (6) is provided in the bottom plate (3), and characterized in that: A plurality of positioning blocks (2) are evenly distributed around the power box (1), a spring (5) is fixedly connected to the bottom of the positioning block (2), a countersunk hole (10) is provided in the positioning block (2), a screw sleeve (8) is vertically slidably installed in the countersunk hole (10), a screw hole (12) is provided at the center of the screw sleeve (8), a limiting groove (13) is provided at the top of the screw sleeve (8), and the cross-section of the limiting groove (13) is a regular polygon; It also includes a screw (7) inserted into the screw hole (12), a limiting plate (14) is fixed to the outer wall of the screw (7), and the cross section of the limiting plate (14) is the same as the cross section of the limiting groove (13).

2. The vehicle-mounted DC switching power supply according to claim 1, characterized in that: There are four positioning blocks (2), which respectively correspond to the four corners of the power box (1).

3. The vehicle-mounted DC switching power supply according to claim 1, characterized in that: The top of the limiting piece (14) is provided with an annular groove (15), and a pull ring (16) is rotatably installed in the annular groove (15).

4. The vehicle-mounted DC switching power supply according to claim 2, characterized in that: A spring sleeve (4) is fixed to the bottom of the positioning block (2), and the spring (5) is sleeved on the outer ring of the spring sleeve (4).

5. The vehicle-mounted DC switching power supply according to any one of claims 1 to 4, characterized in that: The inner wall of the countersunk hole (10) is provided with a flat key groove (9), and the outer wall of the screw sleeve (8) is fixed with a flat key (11) which can slide in the flat key groove (9).

6. The vehicle-mounted DC switching power supply according to claim 2, characterized in that: The cross-sections of the limiting groove (13) and the limiting piece (14) are regular hexagons.

7. The vehicle-mounted DC switching power supply according to claim 5, characterized in that: The top notch of the flat keyway (9) is flush with the top of the positioning block (2).

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