Telescopic power line for energy-saving LED lamp and energy-saving LED lamp

Abstract

The telescopic power line comprises a power line body and a winding unit, and the winding unit comprises an outer cylinder part, an inner cylinder part, a fixing seat, a first fixing ring, a second fixing ring, a third fixing ring, a plurality of first connecting rods, a plurality of second connecting rods and three guide wheel units. According to the telescopic power line, the extending length can be adjusted according to actual requirements, so that the installation problem caused by improper length is avoided. And the wire body is uniformly distributed in the outer cylinder part and can be prevented from being wound, so that heat accumulation is reduced, potential safety hazards caused by overheating are reduced, and the service life of the power line is prolonged. According to the LED lamp, the first fixing ring, the second fixing ring and the third fixing ring are all provided with the holes, when the LED lamp works, convection airflow can enter the interior of the LED lamp holder shell through the holes, the heat dissipation effect on the wire body is achieved, and stable operation of the lamp is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of lamps, and more specifically, to a retractable power cord for an energy-saving LED lamp and an energy-saving LED lamp. Background Art

[0002] LED lamps have been widely used in the modern lighting field due to the energy-saving nature of the LED light-emitting source. Compared with traditional incandescent lamps and fluorescent lamps, LED lamps have significant advantages in terms of energy consumption, lifespan, environmental protection, etc., and have become the mainstream choice for green lighting. With continuous technological innovation, LED lighting will play an important role in more fields and contribute to sustainable development.

[0003] When an LED lamp head is connected to the mains power or solar power supply, a power cord is required. However, in actual installation processes, due to different specifications of lamp heads, as well as factors such as the lamp head brackets used and the installation locations, the actual length of the power cord required is different. For some non-standard installation scenarios, this demand is even more obvious. Existing power cords cannot be adjusted according to the actual required length, which may lead to the smooth progress of the installation work being affected. And although some are set to be of a longer structure, the excess length of the power cord is prone to entanglement and accumulation, which will also cause heat to accumulate. Being in such a high-temperature environment for a long time will accelerate the aging of the insulating layer of the power cord, reduce the insulation performance, and thus increase potential safety hazards. Summary of the Invention

[0004] The present invention aims to overcome the defects of the prior art and provides a retractable power cord for an energy-saving LED lamp and an energy-saving LED lamp.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a power cord, comprising a wire body and a winding unit, wherein the winding unit comprises an outer cylinder, an inner cylinder, a fixing seat fixedly connected to the outer cylinder, a first fixing ring fixedly connected to the inner cylinder, a second fixing ring fixedly connected to the inner cylinder, a third fixing ring fixedly connected to the first fixing ring through a plurality of first connecting rods, a plurality of second connecting rods connecting the second fixing ring and the third fixing ring, and three guide wheel units, wherein the guide wheel unit comprises a limiting plug rod, a fixed pulley installed at the end of the limiting plug rod, and a first ratchet fixed to the limiting plug rod, and the third fixing ring has three limiting sockets cooperating with the limiting plug rod; the three guide wheel units are respectively a first guide wheel unit close to the second fixing ring, a second guide wheel unit close to the first fixing ring, and a third guide wheel unit close to the first fixing ring. The guide wheel unit and the third guide wheel unit close to the second fixed ring; the first fixing ring has two limit plates, the second fixing ring has a limit plate, and the limit plate has a plurality of second ratchet teeth cooperating with the first ratchet teeth; the inner cylinder has a first through hole and a second through hole, the first fixing ring has a first through hole and a second through hole, the fixing seat has a third through hole, and the third fixing ring has a first through hole, a second through hole, a third through hole and a fourth through hole; the electric wire body passes through the first through hole, the first through hole, the fixed pulley of the first guide wheel unit, the second through hole, the fixed pulley of the second guide wheel unit, the third through hole, the fixed pulley of the third guide wheel unit, the fourth through hole, the second through hole, the first through hole, the second through hole and the third through hole in sequence.

[0006] Furthermore, the cross section of the limiting rod is rectangular.

[0007] Furthermore, the first through hole is close to the first fixing ring and is located outside the first fixing ring.

[0008] Furthermore, the second through hole is close to the second fixing ring and is located outside the second fixing ring.

[0009] Furthermore, it also includes an inner rotating ring that surrounds the third fixed ring and is located in the outer cylinder part, and two toggle rods are fixed on the side of the inner rotating ring close to the first fixed ring, and one toggle rod is fixed on the side close to the second fixed ring; the end of the limit plate is fixed with a wedge block that can abut the toggle rod; the three toggle rods correspond one-to-one to the wedge blocks of the three limit plates; the outer cylinder part has a circular groove, the circular groove has an outer rotating ring installed in the circular groove, the circular groove has an arc-shaped through groove, the inner rotating ring has a threaded hole, the outer rotating ring has a bolt through hole, and the bolt through hole is installed with a fixing bolt that passes through the arc through groove and cooperates with the threaded hole.

[0010] Furthermore, as the inner rotating ring rotates, the three toggle rods can abut against the three wedge blocks to cause the three limiting plates to expand outwards.

[0011] As a result, there is a spacing between the first ratchet tooth and the second ratchet tooth, making it easier to pull the wire body.

[0012] Further, the toggle lever includes an L-shaped rod fixedly connected to the inner rotating ring and a contact rod fixedly connected to the L-shaped rod.

[0013] Further, a first annular slide rail is provided on the outer circumferential surface of the inner cylinder part, and a second annular slide rail is provided on the inner circumferential surface of the inner cylinder part; a circular annular protrusion is provided on the outer cylinder part, and the circular annular protrusion has a first circular annular sliding groove adapted to the first annular slide rail; the fixing seat includes a first annular seat fixedly connected to the outer cylinder part and a second annular seat fixedly connected to the first annular seat, and the second annular seat has a second circular annular sliding groove adapted to the second annular slide rail.

[0014] Further, the part of the wire body located between the inner cylinder part and the outer cylinder part is spiral.

[0015] Further, a plurality of strip-shaped through grooves are provided on the outer circumferential surface of the inner cylinder part and are evenly distributed in an annular shape at equal intervals, and the length direction of the strip-shaped through grooves is the same as the length direction of the inner cylinder part.

[0016] As a result, the wire body located between the inner cylinder part and the outer cylinder part can dissipate heat better.

[0017] Further, the end of the outer cylinder part is connected with an end ring through a plurality of end rods; a protrusion part is fixed at the end ring, and a first wire threading seat is installed at the protrusion part through a rotating shaft, and the first wire threading seat has a plurality of first locking bolts for locking the relative positions of the wire body and the first wire threading seat.

[0018] As a result, the first wire threading seat can rotate relative to the protrusion part, so that in the subsequent operation of rotating the inner cylinder part, the first wire threading seat has better adaptability in terms of direction.

[0019] Further, a second wire threading seat is fixed at the fixing seat, and the second wire threading seat has second locking bolts for locking the relative positions of the wire body and the second wire threading seat.

[0020] Further, an annular contact plate is fixed at one end of the inner cylinder part, and a third locking bolt capable of contacting the annular contact plate to lock the relative positions of the first annular seat and the annular contact plate is installed at the first annular seat.

[0021] As a result, the relative positions of the inner cylinder part and the outer cylinder part can be locked.

[0022] Further, the second wire threading seat is fixedly connected to the first annular seat.

[0023] Further, the first wire threading seat has a first wire threading channel; the second wire threading seat has a second wire threading channel.

[0024] Further, the first through hole, the second through hole, the third through hole, and the fourth through hole at the third fixing ring are distributed at equal intervals in a ring shape.

[0025] Further, the end of the inner cylinder part has a plurality of first anti-slip protrusions.

[0026] Thus, the first anti-slip protrusions increase the friction force, making it more convenient to rotate the inner cylinder part.

[0027] Further, the outer rotating ring has a plurality of second anti-slip protrusions.

[0028] Thus, the second anti-slip protrusions increase the friction force, making it more convenient to rotate the outer rotating ring.

[0029] Further, the two limiting plates at the first fixing ring are respectively a first limiting plate that cooperates with the limiting insertion rod of the first guide wheel unit and a third limiting plate that cooperates with the limiting insertion rod of the third guide wheel unit; the limiting plate at the second fixing ring is a second limiting plate that cooperates with the limiting insertion rod of the second guide wheel unit.

[0030] Further, the number of the first connecting rods is four, and they are distributed at equal intervals in a ring shape.

[0031] Further, the number of the second connecting rods is four, and they are distributed at equal intervals in a ring shape.

[0032] Further, the third fixing ring has a third circular sliding rail, and the inner rotating ring has a third circular sliding groove that cooperates with the third circular sliding rail.

[0033] Further, both ends of the wire body are connected with wire joint units.

[0034] Further, the wire body sequentially includes an outer protective layer, a flame retardant layer, and a plurality of wire cores from outside to inside, and the wire cores include an insulating layer and a conductor located inside the insulating layer.

[0035] This application also discloses an energy-saving LED lamp, including an LED lamp head, an installation tube fixedly connected to the LED lamp head, and the telescopic power cord described in any one of the above; the installation tube has a locking bolt, the telescopic power cord is installed inside the installation tube, and the locking bolt locks the relative positions of the installation tube and the outer cylinder part.

[0036] Further, one of the wire joint units at the wire body extends into the shell of the LED lamp head, and the other wire joint unit extends out of the end of the installation tube.

[0037] Further, the lamp head of the LED lamp head has a top cover.

[0038] Thus, it is convenient to open the top cover and connect the power cord.

[0039] Advantageous effects:

[0040] 1. The retractable power cord of the present application can adjust the extended length according to actual needs, thus avoiding installation problems caused by improper length.

[0041] 2. For the retractable power cord of the present application, the wire body is evenly distributed in the outer cylinder part and can avoid entanglement, thereby reducing heat accumulation, reducing potential safety hazards caused by overheating, and extending the service life of the power cord.

[0042] 3. For the LED lamp of the present application, the first, second, and third fixing rings are all provided with holes. When the LED lamp is working, the convective air flow can enter the inside of the LED lamp head housing through them, playing a role in dissipating heat from the wire body and ensuring the stable operation of the lamp. Description of the drawings

[0043] Figure 1 is a schematic diagram of the separation of the power cord, the LED lamp head, and the installation pipe;

[0044] Figure 2 is a schematic diagram of the power cord when a part of the inner cylinder part and the outer cylinder part is cut off;

[0045] Figure 3 is an enlarged view of area A;

[0046] Figure 4 is Figure 2 a schematic diagram of another perspective of;

[0047] Figure 5 is an enlarged view of area B;

[0048] Figure 6 is an enlarged view of area C;

[0049] Figure 7 is a schematic diagram of the separation of the outer cylinder part and the inner cylinder part;

[0050] Figure 8 is a schematic diagram of the separation of the inner cylinder part and the outer cylinder part when a part of the inner cylinder part and the outer cylinder part is cut off;

[0051] Figure 9 is an enlarged view of area D;

[0052] Figure 10 is an enlarged view of area E;

[0053] Figure 11 is an enlarged view of area F;

[0054] Figure 12 is an enlarged view of area G;

[0055] Figure 13 for Figure 5 Schematic diagram from another perspective;

[0056] Figure 14 This is an enlarged view of the H region;

[0057] Figure 15 This is an enlarged view of area I.

[0058] Explanation of the reference numerals: wire body 1; outer sheath 1.1; flame retardant layer 1.2; insulating layer 1.3; conductor 1.4; outer cylinder 2; fixing seat 2.1; third through hole 2.1.1; first annular seat 2.1.2; second annular seat 2.1.3; second annular slide 2.1.4; third locking bolt 2.1.5; annular groove 2.2; arc-shaped through groove 2.3; first annular slide 2.4; end rod 2.5; end ring 2.6; raised portion 2.7; inner cylinder 3; first fixing ring 3.1; first through hole 3.1.1; second through hole 3.1.2; second fixing ring 3.2; third fixing ring 3.3; first through hole 3.3.1; second through hole 3.3.2; third through hole 3.3.3; fourth through hole 3.3.4; first Connecting rod 3.4; second connecting rod 3.5; first through hole 3.6; second through hole 3.7; first annular slide rail 3.8; second annular slide rail 3.9; first anti-slip protrusion 3.10; first guide wheel unit 4.1; second guide wheel unit 4.2; third guide wheel unit 4.3; limiting plug rod 4.4; fixed pulley 4.5; limiting plate 5; second ratchet 5.1; wedge block 5.2; inner rotating ring 6; toggle rod 6.1; threaded hole 6.2; outer rotating ring 7; fixing bolt 7.1; second anti-slip protrusion 7.2; first threading seat 8; first locking bolt 8.1; second threading seat 9; second locking bolt 9.1; annular abutment plate 10; wire connector unit 11; LED lamp holder 12; top cover 12.1; mounting tube 13; locking bolt 13.1. DETAILED DESCRIPTION

[0059] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0060] Example 1

[0061] This embodiment provides a retractable power cord for energy-saving LED lamps as shown in the figure, including a wire body 1 and a winding unit, the winding unit including an outer cylinder 2, an inner cylinder 3, a fixing seat 2.1 fixedly connected to the outer cylinder 2, a first fixing ring 3.1 fixedly connected to the inner cylinder 3, a second fixing ring 3.2 fixedly connected to the inner cylinder 3, a third fixing ring 3.3 fixedly connected to the first fixing ring 3.1 through a plurality of first connecting rods 3.4, and a plurality of third fixing rings 3.3 connecting the second fixing ring 3.2 and the third fixing ring 3.3. Two connecting rods 3.5 and three guide wheel units, each of which includes a limit rod 4.4, a fixed pulley 4.5 mounted on the end of the limit rod 4.4, and a first ratchet fixed to the limit rod 4.4. The third fixing ring 3.3 has three limit holes that cooperate with the limit rod 4.4. The three guide wheel units are a first guide wheel unit 4.1 close to the second fixing ring 3.2, a second guide wheel unit 4.2 close to the first fixing ring 3.1, and a third guide wheel unit 4.3 close to the second fixing ring 3.2. The first fixing ring 3.1 has two limit plates 5, the second fixing ring 3.2 has a limit plate 5, and the limit plate 5 has a plurality of second ratchet teeth 5.1 that cooperate with the first ratchet teeth; the inner cylinder 3 has a first through hole 3.6 and a second through hole 3.7, the first fixing ring 3.1 has a first through hole 3.1.1 and a second through hole 3.1.2, the fixing seat 2.1 has a third through hole 2.1.1, and the third fixing ring 3.3 has a first through hole 3.3.1 and a second through hole 3.3.2. Through hole 3.3.2, third through hole 3.3.3 and fourth through hole 3.3.4; the wire body 1 passes through the first through hole 3.1.1, the first through hole 3.3.1, the fixed pulley of the first guide wheel unit 4.1, the second through hole 3.3.2, the fixed pulley of the second guide wheel unit 4.2, the third through hole 3.3.3, the fixed pulley of the third guide wheel unit 4.3, the fourth through hole 3.3.4, the second through hole 3.1.2, the first through hole 3.6, the second through hole 3.7 and the third through hole 2.1.1 in sequence. The retractable power cord also includes an inner rotating ring 6 that surrounds the third fixing ring 3.3 and is located in the outer cylinder 2. Two toggle rods 6.1 are fixed on the side of the inner rotating ring 6 close to the first fixing ring 3.1, and a toggle rod 6.1 is fixed on the side close to the second fixing ring 3.2; the end of the limiting plate 5 is fixed with a wedge block 5.2 that can abut against the toggle rod 6.1; the three toggle rods 6.1 correspond one to one with the wedge blocks 5.2 of the three limiting plates 5; the outer cylinder 2 has a circular groove 2.2, and an outer rotating ring 7 is installed in the circular groove 2.2, the circular groove 2.2 has an arc-shaped through groove 2.3, the inner rotating ring 6 has a threaded hole 6.2, and the outer rotating ring 7 has a bolt through hole, and the bolt through hole is installed with a fixing bolt 7.1 that passes through the arc-shaped through groove 2.3 and cooperates with the threaded hole.

[0062] The shifting lever 6.1 includes an L-shaped lever fixedly connected to the inner rotating ring 6 and an abutting lever fixedly connected to the L-shaped lever. The outer circumferential surface of the inner cylinder part 3 has a first annular slide rail 3.8, and the inner circumferential surface of the inner cylinder part 3 has a second annular slide rail 3.9; the outer cylinder part 2 has an annular protrusion, and the annular protrusion has a first annular chute 2.4 that cooperates with the first annular slide rail 3.8; the fixed seat 2.1 includes a first annular seat 2.1.2 fixedly connected to the outer cylinder part 2 and a second annular seat 2.1.3 fixedly connected to the first annular seat, and the second annular seat 2.1.3 has a second annular chute 2.1.4 that cooperates with the second annular slide rail 3.9. The part of the wire body 1 located between the inner cylinder part 3 and the outer cylinder part 2 is spiral; the inner cylinder part 3 has a plurality of strip-shaped through grooves that are annularly and equally spaced, and the length direction of the strip-shaped through grooves is the same as the length direction of the inner cylinder part 3. The end of the outer cylinder part 2 is connected with an end ring 2.6 through a plurality of end rods 2.5; a protrusion part 2.7 is fixed at the end ring 2.6, and a first wire threading seat 8 is installed at the protrusion part 2.7 through a rotating shaft. The first wire threading seat 8 has a plurality of first locking bolts 8.1 for locking the relative positions of the wire body 1 and the first wire threading seat 8; a second wire threading seat 9 is fixed at the fixed seat 2.1, and the second wire threading seat 9 has a second locking bolt 9.1 for locking the relative positions of the wire body 1 and the second wire threading seat 9; one end of the inner cylinder part 3 is fixed with an annular abutting plate 10, and the first annular seat 2.1.2 is installed with a third locking bolt 2.1.5 that can abut against the annular abutting plate 10 to lock the relative positions of the first annular seat 2.1.2 and the annular abutting plate 10. The first through hole 3.3.1, the second through hole 3.3.2, the third through hole 3.3.3, and the fourth through hole 3.3.4 at the third fixing ring 3.3 are annularly and equally spaced; the end of the inner cylinder part 3 has a plurality of first anti-slip protrusions 3.10; the outer rotating ring 7 has a plurality of second anti-slip protrusions 7.2. The two limiting plates 5 at the first fixing ring 3.1 are respectively a first limiting plate that cooperates with the limiting insertion rod of the first guide wheel unit 4.1 and a third limiting plate that cooperates with the limiting insertion rod of the third guide wheel unit 4.3; the limiting plate 5 at the second fixing ring 3.2 is a second limiting plate that cooperates with the limiting insertion rod of the second guide wheel unit 4.2; the number of the first connecting rods 3.4 is four, and they are annularly and equally spaced; the number of the second connecting rods 3.5 is four, and they are annularly and equally spaced; the third fixing ring 3.3 has a third annular slide rail, and the inner rotating ring 6 has a third annular chute that cooperates with the third annular slide rail. Both ends of the wire body 1 are connected with wire joint units 11; the wire body 1 sequentially includes an outer protective layer 1.1, a flame retardant layer 1.2, and a plurality of wire cores from outside to inside, and the wire cores include an insulating layer 1.3 and a conductor 1.4 located inside the insulating layer.

[0063] Working principle: After adjusting the required length, the retractable power cord of the present application can be installed in the installation tube of the LED lamp head, so that the wire body extends out an appropriate length, and the wire body located in the outer cylinder part is relatively evenly distributed, thus avoiding heat accumulation caused by the wire body being wound together. And because the first fixing ring, the second fixing ring and the third fixing ring all have holes, when the LED lamp works, the convective air flow can still enter the inside of the LED lamp head housing through the first, second and third fixing rings, thus playing a role in dissipating heat from the LED lamp head.

[0064] For the power cord of the present application, since the wire body is reciprocally arranged in the three guide wheel units and the inner cylinder part and the outer cylinder part can also be wound spirally, the length of the wire body that can be pulled out is longer without increasing the volume, so the applicable occasions are more extensive. The specific installation and adjustment method is as follows. In the initial state, the fixing bolt at the outer rotating ring is fixedly connected to the threaded hole at the inner rotating ring. At this time, rotate the outer rotating ring (only rotate it slightly and keep the outer rotating ring in the rotated position to facilitate pulling the wire body), so that the outer rotating ring drives the inner rotating ring to rotate through the fixing bolt, and the inner rotating ring drives several lever arms to rotate, so that the lever arms abut against the wedge-shaped blocks, causing the three limiting plates to bend away from the corresponding limiting insertion rods, so that there is a certain distance between the first ratchet tooth and the second ratchet tooth. At this time, since the first ratchet tooth and the second ratchet tooth do not contact, it is relatively easy to pull the wire body. At this time, first pull the first wire joint unit (the wire joint unit close to the first fixing ring is called the first wire joint unit). After pulling it to an appropriate length, use the first locking bolt to lock the positions of the first wire threading seat and the wire body (when performing the locking operation, the outer rotating ring can be restored to the initial state, and at this time the first ratchet tooth and the second ratchet tooth cooperate to lock).

[0065] Next, repeat the operation of rotating the outer rotating ring above to pull the second wire connector unit (the wire connector unit close to the second fixed ring is called the second wire connector unit). After pulling it to an appropriate length, restore the outer rotating ring to its initial position, and use the second locking bolt to lock the positions of the wire body and the second wire threading seat. And at this time, remove the fixing bolt. When installing the second wire connector unit at this time, there may still be some extra length after installation, which is not good when exposed outside. At this time, the second locking bolt can be loosened, and the inner cylinder part can be rotated (at this time, the first, second, and third fixed rings and the 3 guide wheel units rotate with the inner cylinder part). Thus, based on the principle of a reel for the inner cylinder part, the wire body with the extra length can be retracted back between the inner cylinder part and the outer cylinder part (at this time, due to the limitation of the first ratchet tooth and the second ratchet tooth, the positions of the three guide wheel units will not change). After all the extra length is retracted between the inner cylinder part and the outer cylinder part (usually the extra length pulled out is not too much, and the inner cylinder part can be rotated half a turn to several turns), use the second locking bolt to lock the positions of the wire body and the second wire threading seat, and then use the third locking bolt to lock the relative positions of the inner cylinder part and the outer cylinder part. And although the inner cylinder part rotates relative to the outer cylinder part, due to the limitation of the first wire threading seat, one end of the first wire connector unit of the wire body basically remains in the same position, and the first wire threading seat can rotate at the convex part, so as to better adapt to the direction of the wire body at this time. In this way, when the wire body connects the power supply unit and the power consumption unit, the extended wire body can be kept at an appropriate length, the extra length can be stored in the outer cylinder part, and the wire body will not be wound together to cause heat accumulation. Moreover, air convection can pass through the first fixed ring, the second fixed ring, and the third fixed ring, so as to realize the heat dissipation of the internal wire body.

[0066] Embodiment 2

[0067] This embodiment provides an energy-saving LED lamp, which includes an LED lamp head 12, an installation pipe 13 fixedly connected to the LED lamp head 12, and the retractable power cord described in any one of the claims; a locking bolt 13.1 is provided at the installation pipe 13, the retractable power cord is installed in the installation pipe 13, and the locking bolt 13.1 locks the relative positions of the installation pipe 13 and the outer cylinder part 2. One of the wire connector units 11 at the wire body 1 extends into the shell of the LED lamp head, and the other wire connector unit 11 extends out of the end of the installation pipe 13. Thus, the power cord of this application can be used to connect and supply power between the driving power supply in the LED lamp head and the power supply unit through the two wire connector units.

[0068] Although the present invention has been illustrated and described with respect to the preferred embodiments, those skilled in the art should understand that various changes and modifications can be made to the present invention as long as they do not exceed the scope defined by the claims of the present invention.

Claims

1. A telescopic power cord for an energy-saving LED lamp, characterized in that, The present invention relates to a wire winding unit, wherein the wire winding unit comprises an outer cylinder, an inner cylinder, a fixing seat fixedly connected to the outer cylinder, a first fixing ring fixedly connected to the inner cylinder, a second fixing ring fixedly connected to the inner cylinder, a third fixing ring fixedly connected to the first fixing ring through a plurality of first connecting rods, a plurality of second connecting rods connecting the second fixing ring and the third fixing ring, and three guide wheel units, wherein the guide wheel unit comprises a limiting plug rod, a fixed pulley installed at the end of the limiting plug rod and a first ratchet fixed to the limiting plug rod, and the third fixing ring has three limiting plug holes that cooperate with the limiting plug rod; the three guide wheel units are respectively a first guide wheel unit close to the second fixing ring, a second guide wheel unit close to the first fixing ring, and a third guide wheel unit close to the second fixing ring. The third guide wheel unit; the first fixing ring has two limit plates, the second fixing ring has a limit plate, and the limit plate has a plurality of second ratchet teeth cooperating with the first ratchet teeth; the inner cylinder has a first through hole and a second through hole, the first fixing ring has a first through hole and a second through hole, the fixing seat has a third through hole, and the third fixing ring has a first through hole, a second through hole, a third through hole and a fourth through hole; the electric wire body passes through the first through hole, the first through hole, the fixed pulley of the first guide wheel unit, the second through hole, the fixed pulley of the second guide wheel unit, the third through hole, the fixed pulley of the third guide wheel unit, the fourth through hole, the second through hole, the first through hole, the second through hole and the third through hole in sequence.

2. The retractable power cord for the energy-saving LED lamp according to claim 1, characterized in that, It also includes an inner rotating ring that surrounds the third fixing ring and is located in the outer cylinder part, and two toggle rods are fixed to the side of the inner rotating ring close to the first fixing ring, and a toggle rod is fixed to the side close to the second fixing ring; the end of the limit plate is fixed with a wedge block that can abut the toggle rod; the three toggle rods correspond one-to-one to the wedge blocks of the three limit plates; the outer cylinder part has a circular groove, the circular groove has an outer rotating ring installed in the circular groove, the circular groove has an arc-shaped through groove, the inner rotating ring has a threaded hole, the outer rotating ring has a bolt through hole, and the bolt through hole is installed with a fixing bolt that passes through the arc through groove and cooperates with the threaded hole.

3. The retractable power cord for the energy-saving LED lamp according to claim 2, wherein The toggle rod comprises an L-shaped rod fixedly connected to the inner rotating ring and an abutting rod fixedly connected to the L-shaped rod.

4. The retractable power cord for an energy-saving LED lamp according to claim 2, wherein, The outer circumferential surface of the inner cylinder part is provided with a first annular slide rail, and the inner circumferential surface of the inner cylinder part is provided with a second annular slide rail; the outer cylinder part is provided with an annular protrusion, and the annular protrusion has a first annular slide groove that cooperates with the first annular slide rail; the fixed seat includes a first annular seat fixedly connected to the outer cylinder part and a second annular seat fixedly connected to the first annular seat, and the second annular seat has a second annular slide groove that cooperates with the second annular slide rail.

5. The retractable power cord for the energy-saving LED lamp according to claim 2, characterized in that, The portion of the wire body located between the inner cylinder and the outer cylinder is spiral-shaped; the inner cylinder has a plurality of strip-shaped through grooves distributed in an annular shape with equal intervals, and the length direction of the strip-shaped through grooves is consistent with the length direction of the inner cylinder.

6. The retractable power cord for energy-saving LED lamps according to claim 4, wherein, The end of the outer cylinder part is connected with an end ring through a plurality of end rods; a convex part is fixed at the end ring, a first wire threading seat is installed at the convex part through a rotating shaft, and a plurality of first locking bolts for locking the relative positions of the wire body and the first wire threading seat are provided at the first wire threading seat; a second wire threading seat is fixed at the fixed seat, and a second locking bolt for locking the relative positions of the wire body and the second wire threading seat is provided at the second wire threading seat; a ring-shaped abutting plate is fixed at one end of the inner cylinder part, and a third locking bolt capable of abutting against the ring-shaped abutting plate to lock the relative positions of the first ring-shaped seat and the ring-shaped abutting plate is installed at the first ring-shaped seat.

7. The retractable power cord for the energy-saving LED lamp according to claim 2, characterized in that, The first through hole, the second through hole, the third through hole and the fourth through hole at the third fixing ring are annularly and equally spaced; a plurality of first anti-slip protrusions are provided at the end of the inner cylinder part; a plurality of second anti-slip protrusions are provided at the outer rotating ring.

8. The retractable power cord for the energy-saving LED lamp according to claim 2, wherein The two limiting plates at the first fixing ring are respectively a first limiting plate for cooperating with the limiting insertion rod of the first guide wheel unit and a third limiting plate for cooperating with the limiting insertion rod of the third guide wheel unit; the limiting plate at the second fixing ring is a second limiting plate for cooperating with the limiting insertion rod of the second guide wheel unit; the number of the first connecting rods is four and they are annularly and equally spaced; the number of the second connecting rods is four and they are annularly and equally spaced; a third circular sliding rail is provided at the third fixing ring, and a third circular sliding groove for cooperating with the third circular sliding rail is provided at the inner rotating ring.

9. The retractable power cord for an energy-saving LED lamp according to claim 2, wherein, Both ends of the wire body are connected with wire joint units; the wire body sequentially includes an outer protective layer, a flame retardant layer and a plurality of wire cores from outside to inside, and each wire core includes an insulating layer and a conductor located inside the insulating layer.

10. An energy-saving LED lamp, characterized in that, It includes an LED lamp head, an installation pipe fixedly connected with the LED lamp head and the retractable power cord according to any one of claims 1-9; a locking bolt is provided at the installation pipe, the retractable power cord is installed in the installation pipe, and the locking bolt locks the relative positions of the installation pipe and the outer cylinder part.

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