CN203940390U

CN203940390U - The cold junction heat pipe LED light fixture that directly dispels the heat

Info

Publication number: CN203940390U
Application number: CN201420055829.7U
Authority: CN
Inventors: 邱玉燕
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-01-28
Filing date: 2014-01-28
Publication date: 2014-11-12
Anticipated expiration: 2024-01-28

Abstract

The cold junction heat pipe LED light fixture that directly dispels the heat, comprise heat pipe, LED, driving power, with extraneous electrical connection interface and control system, it it is characterized in that the hot end surface of heat pipe, and the non-light-emitting area of LED matches and the non-light-emitting area of LED is connected with heat pipe hot junction direct heat transfer.The utility model cold junction directly dispels the heat, and its heat pipe hot junction of heat pipe LED light fixture is direct conducts heat and is connected with LED, in the situation that directly dispelling the heat with heat pipe cold junction, the shortest heat transfer glue or elastic conducting hotting mask and the heat pipe only comprising between LED and heat pipe of its heat transfer path from LED to environment.By make the pleated area of dissipation that can increase considerably at heat pipe cold junction, meet the requirement to radiator heat-dissipation area.

Description

Cold end direct heat radiation heat pipe LED lamp

Technical Field

The utility model relates to a cold junction direct heat dissipation heat pipe LED lamps and lanterns. The LED is an english abbreviation of laser light emitting diode, and can be regarded as a recognized technical term in the technical field.

Background

The LED lamp adopting the gravity heat pipe has a general structure that a plurality of LEDs are connected to a hot end below the heat pipe in a heat transfer mode. The main role of the heat pipe in this case is to achieve heat flux density conversion and heat dissipation. The associated heat flux density transitions from approximately 0.5 watts per square centimeter to approximately 0.06 watts per square centimeter.

Considering the existing LED lamp, for one of the LEDs with a length and width of 5 × 7 mm, a total power of 0.6 w, an efficiency of 21%, and energy except for light emission all conducted to the environment through the surface, the total surface area of the LED is 1 cm 2 (0.5 × 0.7 × 2+0.1.25 (7 +5+7+ 5)), and the heat flux density of the heat dissipation load is 0.6 (1-0.21)/1 = 0.474 w/cm 2. Without the use of a heat sink, the surface temperature of the LED may exceed 100 ℃.

In addition, for an LED with a heat sink having a heat dissipation load of 10W, the heat dissipation power density was 0.05W/cm 2 in terms of a heat dissipation area 200 parallel square cm on the surface of the heat sink. As a control reference: the peak intensity of the sunlight exposure is about 1 kilowatt per square meter and 0.1 watt per centimeter 2. A25 watt incandescent bulb having a surface area of 170 cm 2 causes a significant temperature rise at the surface of the glass envelope due to the infrared blocking and absorbing effect of the glass envelope. Here, taking 10 watts of heat dissipation power through the glass bulb, the density of the heat dissipation power conducted through the glass bulb is 10/170 ≈ 0.0588 watts/cm 2.

The calculation formula of the object heat dissipation power and the heat dissipation surface temperature rise is as follows:

Q=K*ΔT*S…………

in the formula 1, Q is heat dissipation power, and the dimension is tile; k is the heat transfer coefficient from the surface of the cold end of the heat pipe to air, and the dimension is tile/(° c square meter); delta T is the temperature rise of heated air, and the dimension is K or; and S is the area of the cold end of the heat pipe in contact with air, and the dimension is square meter.

Substituting Q =10, K =23 watts per square meter (C), and S =0.02 square meter; the temperature rise delta T of the heat dissipation model is obtained to be approximately equal to 21.74 ℃. When S =0.017 square meters, the temperature rise delta T is approximately equal to 25.58 ℃. All heat dissipation loads here enter the environment by heat exchange with the air at an almost average temperature. In practice, the value of the heat transfer coefficient K is also related to the surface conditions, including the cleaning state and the emissivity.

For LED fixtures, the heat dissipation path from the LED to the air is much more complex than for incandescent lamps. The temperature rise value of the surface of the LED lamp radiator relative to the ambient temperature of 30 ℃ is 21.74 ℃, the temperature drop of the heat conducting material between the LED and the hot end of the heat pipe is 2 ℃, the temperature drop of the pipe wall of the hot end of the heat pipe is 2 ℃, the temperature drop of two-phase flow heat exchange from the hot end of the heat pipe to the cold end is negligible, and the temperature drop of the pipe wall of the cold end of the heat pipe is 1 ℃, so that the surface temperature of the LED can reach 30+21.74+1+2+2=56.74 ℃. In view of the fact that the surface temperature of an LED varies with ambient temperature and its own heat flux density. When the highest value of the set environment temperature is 30 ℃, the heat transfer coefficient is set to be 23 and the highest temperature of the LED is 64 ℃, the area of the cold end of the heat pipe required by each watt of heat dissipation power is at least 15 square centimeters; the corresponding heat flux density was 0.0667 watts/cm 2. Under the working condition, the light attenuation of the LED10 for ten thousand hours is expected to be lower than 20 percent; and the light attenuation of the few poor LED lamps in the prior art can reach more than 50% only in summer.

Chinese patent 2008200495178 discloses a high-power heat pipe LED lighting device, which includes an LED, a base, a heat pipe, and a heat dissipation device, wherein one side of the base is provided with one or more LEDs, one end, i.e., a hot end, of the heat pipe is connected to the base, and the other end, i.e., a cold end, of the heat pipe is connected to the heat dissipation device. The heat pipe and the base are directly welded or filled with heat-conducting silicone grease without other intermediate heat transfer media, so that the heat resistance is relatively low and the heat transfer efficiency is high. The heat dissipation structure has the characteristics of simple structure, good heat dissipation effect and reliable work. But the base is adopted to be connected with the LED in a heat transfer way, and an electric insulation layer is required to be arranged to realize electric isolation; the cold end of the metal heat pipe is provided with the heat dissipation fin plate as a heat exchange interface with air, and because the temperature between the cold end of the heat pipe and the heat dissipation fin plate is also reduced and the surface temperature of the heat dissipation fin plate is uneven, a heat dissipation link and heat exchange thermal resistance with air are increased; heat sinks are costly and not easily cleaned; an insulating layer with higher pressure resistance is needed between the hot end of the metal heat pipe and the LED, and the insulating layer has thermal resistance. The surface of the LED has much larger temperature drop because of the large heat flow density and the same thermal resistance. Since LEDs are sensitive to temperature, LEDs will decay faster at temperatures above 65 ℃. Therefore, the reduction of the heat transfer link and the reduction of the thermal resistance of the heat transfer link have important significance.

Disclosure of Invention

The utility model aims at providing a cold junction directly dispels heat pipe LED lamps and lanterns.

The utility model discloses realize the technical scheme of its purpose: a cold end direct heat dissipation heat pipe LED lamp is manufactured and comprises a heat pipe, an LED, a driving power supply and an electrical connection interface with the outside. And a heat transfer substrate is contained or not contained between the heat pipe and the LED. The heat pipe comprises a pipe shell, an exhaust pipe, a working medium and a liquid absorption core net. The cold end of the heat pipe may or may not be pleated. The electrical connection interface with the outside comprises a two-core wire or a bulb screw connector. When the color or the color temperature of the LEDs is constant, the LEDs forming the color or the color temperature comprise three-primary-color LEDs and can be electrically connected with the outside only by one group of two leads; when the color or the color temperature of the LEDs is adjustable, the LEDs forming the color or the color temperature comprise three-primary-color LEDs and are respectively electrically connected with the outside by adopting a group of two leads. All parts of the heat pipe shell are seamlessly fused, sealed and connected into a whole; the surface of the hot end of the heat pipe is matched with the non-luminous surface of the LED, and the non-luminous surface of the LED is directly connected with the hot end of the heat pipe in a heat transfer way; the cold end of the heat pipe is not provided with a fin plate.

The outer side of the hot end of the heat pipe can also contain an LED circuit board. The inner side surface of the LED circuit board is matched with the outer surface of the hot end of the heat pipe. The LED circuit board comprises an insulating substrate, and a conducting circuit, an LED connecting interface, a circuit board reinforcing layer and meshes which are manufactured on the insulating substrate. The LED connection interface comprises a solder interface. The LED connecting interface is used for connecting an LED; and a heat insulation design is adopted between the LED connecting interface and the heat pipe. The reinforcing layer comprises a porous steel plate or an elastic mesh plate embedded in the insulating substrate. The rigidity and the stability of the LED circuit board can be obviously enhanced by adopting the reinforcing layer. Proper mesh can reduce the wrapping of the heat pipe, which is beneficial to heat dissipation. The LED circuit board and the driving power supply are connected through a plurality of cables, and the connection of the LED circuit board and the driving power supply comprises mechanical connection, electrical connection and binding connection of the heat pipes at the same time. The connection of the LED circuit board and the driving power supply comprises the realization of a cable connection interface around the LED circuit board or the driving power supply; the cable connection interface includes a cable-winding stub. Typically, the cable is adhesively secured to the heat pipe with an adhesive material, and sometimes the cable may also employ a narrow strip of metal foil to reduce protrusion from the surface of the heat pipe. Or, the driving power supply adopts a structure that the driving power supply main body is connected with a driving power supply base. The drive power supply main body is provided with a contact piece, and the drive power supply base is provided with a cable clamping groove. After the driving power supply main body is connected with the driving power supply base in a matched mode, the contact piece is electrically connected with the cable clamping groove. And a quick-connect cable with a cable clamping end and an elastic member connected in series/parallel is adopted. The series connection means that the elastic part is connected with a cable in series and the elastic part flows the same current as the cable; the connection means that both ends of the elastic member are connected to a cable having a sufficient length and the connection member may pass no current or less current. The quick-connection cable has high enough tensile strength; the resilient member comprises a length of spring. And the cable clamping end is connected with the cable clamping groove in a clamping manner. The connection between the LED circuit board and the quick-connection cable comprises welding connection or quick-assembly connection. The quick-assembly connection comprises the clamping connection.

The LED circuit board can also comprise a plurality of LED holes, and the edge of each LED hole comprises more than two connecting interfaces with the LEDs; the LED is arranged in the LED hole and is in heat transfer connection with the hot end of the heat pipe through heat conducting materials including an elastic heat conducting film and a transparent heat conducting bonding material.

The LED connecting interface on the LED circuit board can also be a stainless steel sheet arranged on the circuit board; both ends of the LED respectively comprise a stainless steel sheet stitch welding flat sheet with a corrugated transition section; the two stainless steel sheets, namely the stainless steel sheet on the circuit board and the stitch welding flat sheet are mutually overlapped and contain welding connection parts of laser stitch welding.

The LED circuit board may also be made to include a flexible circuit board.

The surface of the LED in heat transfer connection with the hot end of the heat pipe is provided with an elastic heat-conducting film with the shape matched with the surface of the hot end of the heat pipe; the heat pipe comprises a connecting interface with the LED circuit board and the driving power supply or the driving power supply base, and the connecting interface comprises a threaded connecting interface with the LED circuit board and the driving power supply or the driving power supply base; the connecting interface also comprises more than one positioning step which protrudes outwards, and the surfaces of the LED circuit board and the driving power supply or the driving power supply base respectively comprise connecting interfaces which are matched with the surfaces of the positioning steps; or,

adopting a plurality of attached radiating fins or attached radiating fin groups which are in heat transfer connection with the cold ends of the heat pipes; the surface of the LED in heat transfer connection with the hot end of the heat pipe and the surface of the contact part of the attached radiating fin or the attached radiating fin group and the heat pipe contain heat-conducting glue or an elastic heat-conducting film with the shape matched with the surface of the hot end of the heat pipe; the heat pipe comprises a connecting interface with the LED circuit board and the driving power supply or the driving power supply base, and the connecting interface comprises a threaded connecting interface with the LED circuit board and the driving power supply or the driving power supply base; the connecting interface also comprises more than one positioning step which protrudes outwards, and the surfaces of the LED circuit board and the driving power supply or the driving power supply base respectively comprise connecting interfaces which are matched with the surfaces of the positioning steps.

The LED circuit board can also comprise a quick-connection cable which is provided with a sleeve buckle at one end and is not connected with the elastic piece in series; the driving power supply base comprises a telescopic spring hook; the quick-connection cable is sleeved with the spring hook to realize electrical and mechanical connection between the quick-connection cable and the spring hook; or the LED circuit board comprises a quick-connection cable with a sleeve buckle at one end and not connected with the elastic piece in series; the driving power supply base comprises a flexible springboard hook; the quick connection cable is sleeved with the elastic plate hook to realize electrical and mechanical connection between the quick connection cable and the elastic plate hook.

The two ends of the LED can also respectively contain a heat pipe shell clamp spring piece, the clamp spring piece comprises two spring pieces, and the free end of each spring piece respectively contains more than one contact pin. The clamp spring piece is connected with the hot end of the heat pipe in a heat transfer way; the contact pin can be inserted into a contact pin base to realize the electrical connection between the contact pin and the contact pin base.

The cold end direct heat radiation heat pipe LED lamp of the utility model can also comprise a light homogenizing sheet; the hot end or the boundary of the hot end of the heat pipe and the inner side of the uniform light sheet respectively comprise a uniform light sheet magnetic connecting interface; the magnetic connecting interface comprises the following materials: paramagnetic material + permanent magnetic material or permanent magnetic material + permanent magnetic material; the two uniform light sheet magnetic connecting interfaces are magnetically connected.

More than one heat pipe can be adopted, including a heat pipe with more than one cold end, a U-shaped tubular heat pipe with two cold ends, and a multi-cold-end heat pipe with a main cold end, two U-shaped main cold ends and a branch cold end which is connected with the main cold end in a bypass mode; each cold end comprises a cold end which is straight upwards, spirally bent upwards and snakelike bent upwards; all the LEDs are uniformly distributed at the hot end of each heat pipe according to the heat dissipation load.

The cold end of the heat pipe does not contain a special radiating fin; or the cold end of the heat pipe has a large surface area surface including folds.

The utility model has the advantages that: the utility model discloses its heat pipe cold junction of cold junction direct heat dissipation heat pipe LED lamps and lanterns directly dispels the heat, and its heat transfer route from LED to the environment is the shortest only to include heat transfer glue or elastic insulation heat conduction membrane and heat pipe between LED and the heat pipe. The practical effect is as follows: on the premise that the manufacturing cost of the heat pipe radiator, even the radiator, is averagely reduced by 50 to 70 percent, the service life of 20 percent of light attenuation is prolonged to more than 7 years from the average 2 to 3 years of the existing heat pipe radiator or cast aluminum radiator product. The casting of nonferrous metals related to the cast aluminum radiator is a major pollution source; the heat pipe processing has a negligible environmental load and obvious environmental benefits. The cold end of the heat pipe with the large specific surface area comprises folds at the cold end of the heat pipe, so that the heat dissipation area can be greatly increased, the working temperature of the LED is further reduced, and the manufacturing cost is minimally increased.

The utility model discloses the direct heat pipe LED lamps and lanterns that dispel the heat of cold junction do not adopt the fin only to rely on the heat pipe cold junction heat dissipation to compare with the heat pipe LED lamps and lanterns that adopt the fin and have the easy clear advantage in surface. The titanium dioxide photocatalyst coating is coated on the pipe wall of the heat pipe, so that organic dirt contacting with the titanium dioxide coating can be continuously decomposed by utilizing light of a lamp, and the effect of automatic cleaning is achieved.

The heat pipe LED lamp adopts a quick-connection cable to form a detachable structure, so that different shapes including the heat pipe simulating the animal and plant shapes can be conveniently replaced, and the entertainment interest is increased. The inside of the high-transparency heat pipe can obtain a brand-new experience by utilizing the flow of steam or setting some new contents.

The LED circuit board provides an integrated platform for heat transfer connection between the LED and the heat pipe and electrical connection between the LED and the outside.

The LED holes are formed in the LED circuit board, so that the LEDs can be directly connected with the heat pipe in a heat transfer mode, and the minimization of heat transfer resistance is facilitated. The LED is firmly welded by laser welding, can be realized at normal temperature, and has small thermal shock to the pipe wall of the heat pipe in the welding process.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a schematic structural diagram of a heat pipe LED lamp using a single heat pipe.

Fig. 2 is a schematic structural diagram of an LED circuit board of a heat pipe LED lamp, which is a front view of the LED circuit board of fig. 1.

Fig. 3 is a schematic structural diagram of a heat pipe with a truncated cone-shaped cold end, which is a special description of the heat pipe in fig. 1.

Fig. 4 is a schematic front view of a heat pipe LED lamp using a laser stitch welding LED stitch welding plain film.

Fig. 5 is a schematic top view of a heat pipe LED lamp using a laser stitch welding LED stitch welding flat sheet.

FIG. 6 is a schematic structural view of a heat pipe LED lamp with a heat pipe having an interface connecting a driving power supply base and an LED circuit board.

Fig. 7 is a specific illustration of the heat pipe of fig. 6.

Fig. 8 is a schematic view of a quick connect cable connected to a snap hook.

Fig. 9 is a schematic view of a quick connect cable connected to a springboard hook.

Fig. 10 is a schematic front view of a heat pipe snap heat transfer connection of a snap spring member of an LED and an electrical connection of a hub.

FIG. 11 is a side view of the heat pipe snap fit heat transfer connection of a snap spring member of an LED and the electrical connection of a hub.

FIG. 12 is a schematic structural diagram of a multi-cold end heat pipe LED lamp.

FIG. 13 is an expanded view of a heat pipe of a U-shaped variable tubular heat pipe LED lamp with two serpentine bends towards the upper cold end.

FIG. 14 is a schematic top view of a U-shaped tube-shaped heat pipe LED lamp with two serpentine bends for upward cooling ends.

FIG. 15 is an expanded view of a heat pipe of a U-shaped tapered tubular heat pipe LED lamp with two equal-angle inclined upward cold ends.

FIG. 16 is a schematic top view of a U-shaped tapered tubular heat pipe LED lamp with two equal-angle inclined upward cold ends.

Fig. 17 and 18 are a schematic top view and a schematic front view of a jacketed heat pipe LED lamp, respectively.

FIG. 19 is a schematic view of a heat pipe LED spotlight.

Fig. 20 is a schematic structural diagram of an LED wall lamp.

FIG. 21 is a schematic structural diagram of an LED crystal-imitated ceiling lamp array.

FIG. 22 is a schematic view of a composite structure of an LED ceiling lamp, with a top view; the lower part is a front view.

FIG. 23 is a schematic side view of a heat pipe LED traffic signal.

FIG. 24 is a schematic rear view of a heat pipe LED traffic signal.

FIG. 25 is a schematic view of a top half parabolic rotator jacketed heat pipe LED lamp.

Fig. 26 is a schematic structural diagram of an inverted parabolic rotator heat pipe LED lamp.

Fig. 27 is a schematic front view of a plate-shaped heat pipe LED lamp.

FIG. 1 illustrates a heat pipe; 2, an LED; 3. a drive power supply base; 4. a driving power supply main body; 5. an electrical connection interface with the outside; 6. light homogenizing; 7. an exhaust pipe; an LED circuit board; 12. a conductive circuit; 14. a cable clamping groove; LED connection interface; 16. a cable clamping end; 17. an elastic member; 18. quickly connecting a cable; an LED hole; 20. a contact piece; 21. a magnetic connector; 22. a conductive adhesive material; 23. a corrugated transition section; 24. stitch welding flat sheets; 26. 27, positioning a step; 28. a mating connection interface; 30. attaching a radiating fin; 31. a wire spring; 32. a spring hook; 33. a springboard hook; 34. a clamp spring member; 35. inserting a pin; 36. a needle inserting seat; 38. a hot end; 39. a primary cold end; 40. a cold end; 41. clamping a hoop; 42. a drive power supply; 43. folding; 44. a condenser lens; 45. a housing; 46. a guide rail foundation; 47. a connecting surface; 49. a chute; 50. an upper half paraboloid rotator jacket; 51. a lower half paraboloid of revolution; 52. a parabolic rotating body jacket; 53. a wick net; 54. a support member; 55. a bubble.

Detailed Description

Fig. 1 to 3 together show a first exemplary embodiment of the invention.

In fig. 1 to 3, the heat pipe LED lamp includes a heat pipe 1, an LED2, a driving power supply base 3, a driving power supply main body 4, an electrical connection interface 5 with the outside, a light homogenizing sheet 6, and a control system 13. The heat pipe 1 comprises a pipe shell, an exhaust pipe 7 and a working medium. If necessary, a wick net may be provided inside the heat pipe 1. The working medium comprises water and ethanol. If the product is possibly frozen in the use occasions and the storage and transportation processes, ethanol can be selected as the working medium. The electric connection interface 5 with the outside adopts a bulb screw and a wire which can use a screw lamp holder. All parts of the pipe shell of the heat pipe 1 are seamlessly fused, sealed and connected into a whole. The hot end surface of the heat pipe 1 is coincident with the surface of the LED 2. The cold end of the heat pipe 1 is not creased and does not use a heat sink. The LED2 is in heat transfer connection with the hot end of the heat pipe 1. In fig. 1 to 3, the arrows side by side and inwards indicate the hot ends of the heat pipes, which absorb heat energy; the side-by-side outward arrows indicate the cold ends of the heat pipes, which release heat energy.

The outer side of the hot end of the heat pipe 1 contains an LED circuit board 11. The LED circuit board 11 includes an insulating substrate, and a conductive circuit 12, a cable clamping groove 14, an LED connection interface 15 and a reinforcing layer formed on the insulating substrate. The reinforcing layer is embedded in the insulating substrate by adopting a porous steel plate. The porous steel plate reinforcing layer is light in weight and guaranteed in strength, and the hollow part of the porous steel plate reinforcing layer does not influence the conductor to penetrate through the LED circuit board 11. At least two or more of the conductive traces 12 are not directly electrically connected to each other. The inner side surface of the LED circuit board 11 is matched with the outer surface of the hot end of the heat pipe 1. The peripheries of the LED circuit board 11 and the driving power base 3 contain a plurality of cable clamping grooves 14. And the cable clamping ends 16 are connected with the LED circuit board 11 and the cable clamping grooves 14 on the driving power supply base 3 in a clamping manner, so that the electrical connection between the LED circuit board 11 and the driving power supply base 3, the mechanical connection between the LED circuit board 11, the driving power supply base 3 and the heat pipe 1 are realized. The LED connection interface 15 is for electrical connection with the LED2 including a soldered connection. The quick-connect cable 18 may be adhesively secured to the heat pipe 1 using an adhesive material, including a transparent adhesive paper.

The LED circuit board 11 contains a number of LED holes 19, and LEDs 2 are placed in the LED holes 19. The edge of each LED hole 19 contains two LED connection interfaces 15. The LED connecting interface 15 and the heat pipe 1 adopt a heat insulation design. The LED2 is disposed in the LED hole 19 and is in heat transfer connection with the hot end of the heat pipe 1 via an elastic heat-conducting film or a heat-conducting adhesive material.

The drive power supply main body 4 is connected with the drive power supply base 3 by a screw thread. After the driving power supply main body 4 is connected with the driving power supply base 3, the driving power supply main body 4 is electrically connected with the cable clamping groove 14 on the driving power supply base 3 through the contact piece 20; turning on the lit LED 2.

The light homogenizing sheet 6 is magnetically attracted with the permanent magnetic connecting piece 21 arranged on the heat pipe 1 through the permanent magnetic connecting piece 21 arranged on the light homogenizing sheet 6 to realize the connection with the heat pipe 1. The setting includes pre-embedding and bonding of injection molding.

The LED connection interface 15 in embodiment 1 can also refer to embodiment 2 of fig. 4 and 5.

Fig. 4 and 5 show a second embodiment of the present invention.

In fig. 4 and 5, an LED circuit board 11 is attached to the hot end of the heat pipe 1. The LED circuit board 11 is provided with a conductive circuit 12 and a cable clamping groove 14, and the cable clamping groove 14 is clamped and connected with a cable clamping end 16 of a quick-connection cable 18. The LED circuit board 11 is also provided with an LED hole 19 for mounting the LED 2.

The LED connection interface 15 made on the LED circuit board 11 is a stainless steel sheet on the circuit board with a thickness of 0.4 mm. The thermal insulation design is adopted between the LED connecting interface 15 and the glass heat pipe 1 so as to reduce thermal shock and heat transfer to the glass heat pipe 1. The contact surface of the LED2 and the glass heat pipe 1 is coated with the heat-conducting binding material 22. The two ends of the LED2 are respectively overlapped with the stainless steel thin plate on the circuit board of the LED connecting interface 15 through the stitch welding flat sheet 24 with the corrugated transition section 23. And (3) stitch welding is carried out on two overlapped stainless steel plates with the thickness of 0.4 mm by adopting laser. The thickness of the stainless steel sheet on the stitch bonding pad 24 and the circuit board of the connection interface 15 can be adjusted. The stainless steel sheet on the LED connection interface 15 board is subjected to laser welding, so the reinforcing layer embedded in the LED circuit board 11 below it should remain a steel sheet.

The reliability of the solder connection may be increased by using a multi-spot stitch such as the 3-spot stitch on the stitch plate 24 depicted in fig. 5. The use of the stitch bonded flat sheet 24 with the corrugated transition section 23 may mitigate the negative effects of potentially harmful stresses between the LED2 and the LED circuit board 11, and may mitigate adverse mechanical forces, thermal shock, and heat transfer to the glass heat pipe 1.

Fig. 6 and 7 show a third embodiment of the present invention.

In fig. 6 and 7, the heat pipe LED lamp includes a heat pipe 1, an LED2, a driving power supply base 3, a driving power supply main body 4, and an electrical connection interface 5 with the outside. The outer side of the hot end of the heat pipe 1 contains an LED circuit board 11. The surface of the LED2 mounted on the LED circuit board 11 in contact with the heat pipe 1 contains an elastic heat conductive film. The elastic heat conducting film is arranged for maintaining good heat conducting conditions between the heat pipe 1 and the LED after the heat pipe 1 is replaced for multiple times. The heat pipe 1 has one or more positioning steps 26 and 27 protruding outward as a connection interface at a portion contacting the driving power supply base 3 and the LED circuit board 11. The positioning steps 26 and 27 may be circular in shape or other shapes. The driving power supply base 3 and the LED circuit board 11 have mating connection interfaces 28, 29 with the positioning steps 26 and 27 of the heat pipe 1, respectively. The locating steps 26 and 27 and mating connection interfaces 28, 29 may also be deformed into interfitting threaded connection interfaces. The periphery of the driving power supply base 3 adopts a plurality of cable clamping grooves 14. And the quick-connection cables 18 are electrically connected with the LED circuit board 11, are provided with cable clamping ends 16 and are connected with the elastic pieces 17 in series, and are clamped and connected with the cable clamping grooves 14 on the driving power supply base 3 through the cable clamping ends 16, so that the connection among the driving power supply base 3, the LED circuit board 11 and the heat pipe 1 and the electrical connection among the driving power supply base 3 and the LED circuit board are realized.

Adopt the cable joint of the embodiment of fig. 6 and 7 to connect the mode soon, can make things convenient for junior middle school to change heat pipe 1 by hand. The structure that the driving power supply base 3 and the driving power supply main body 4 are connected is also used for upgrading the LED lamp, namely, software and hardware of the LED lamp can be upgraded only by replacing the driving power supply main body 4. The LED, the LED circuit board and the heat pipe with higher value can be reserved when the LED lamp is upgraded.

In the embodiments of fig. 6 and 7, an attached heat sink 30 or a group of attached heat sinks may be further added on the outer surface of the cold end of the heat pipe 1 and is hooped by a steel wire thin spring 31 for fixing. The contact position of the attached radiating fin 30 and the heat pipe 1 contains heat conducting glue or is provided with an elastic heat conducting film.

Fig. 8 shows a fourth embodiment of the present invention.

In fig. 8, a quick connect cable 18 with a sleeve buckle at one end is sleeved on a spring hook 32 to realize electrical and mechanical connection with the spring hook 32 when the spring hook 32 which is connected with a driving power base and has elasticity is pulled down. Here, the quick-connect cable 18 omits to use the elastic member 17 in embodiment 3.

Fig. 9 shows a fifth embodiment of the present invention.

In fig. 9, a snap-in cable 18 with a sleeve buckle at one end is sleeved on a spring plate hook 33 to realize electrical and mechanical connection with the spring plate hook 33 when the spring plate hook 33 which is connected with a driving power supply base and has elasticity is pulled down. Here, the quick-connect cable 18 omits to use the elastic member 17 in embodiment 3.

The embodiment of fig. 8 and 9 is convenient for the utility model discloses fast-assembling, maintenance, upgrading and the style diversification of heat pipe LED lamps and lanterns.

Fig. 10 and 11 together show a sixth embodiment of the present invention.

In fig. 10 and 11, two ends of the LED2 each include a heat pipe shell spring member 34, the spring member 34 includes two springs, and the free ends of the springs each include a pin 35. The clamp spring element 34 is connected with the hot end of the heat pipe 1 in a heat transfer way. To improve heat transfer efficiency, the surfaces of the LEDs 2 in contact with the heat pipes may be coated with a thermally conductive bonding material or provided with a flexible thermally conductive film. The pin 35 may be inserted into a mating receptacle 36 to make electrical connection with the receptacle 36.

Advantages of the snap spring member 34 include the simplification or omission of the LED circuit board. The embodiment of fig. 10 and 11 is also suitable for long-strip LED lamps, in which case the LEDs 2 with the snap spring element 34 are distributed at the hot end of a long heat pipe.

Fig. 12 shows a seventh embodiment of the present invention.

In fig. 12, the heat pipe LED lamp includes a heat pipe 1, an LED2, and an electrical connection interface 5 with the outside. The hot end 38 of the heat pipe 1 is in a disc shape, and the upper end surface of the hot end 38 is provided with a hole and is connected with the main cold end 39 in a melting and sealing mode. The main cold end 39 is connected with a plurality of branch cold ends 40 by side to form a multi-cold-end heat pipe 1. The LED circuit board 11 is fixedly connected with the periphery of the hot end 38 of the heat pipe 1 by a plurality of clips 41. The electrical connection interface 5 with the outside is provided above the primary cold end 39. The exhaust pipes of heat pipes 1 are arranged at the upper ports of primary and cold ends 39.

The multi-cold-end heat pipe LED lamp in the embodiment of FIG. 12 can take a smaller volume while maintaining a certain cold end area. Since a 150 mm diameter tube has the same external surface area of the cylindrical portion as 5 tubes of 30 mm diameter, but the volumes of the two can differ by many times.

Fig. 13 and 14 show an eighth embodiment of the present invention.

In fig. 13 and 14, the hot end 38 of the U-shaped tapered tubular heat pipe 1 with the cold ends 40 of the two serpentine segments is in heat transfer connection with an LED 2. The narrower cold end 40 of the inner heat pipe is indicated by the lighter color. The outer layer cold end 40 is shown as being wider in color. Each hot side 38 may be thermally coupled to more than one LED 2. All of the LEDs 2 are equally spaced on the hot end 38 of the heat pipe 1 according to the heat dissipation load. The exhaust pipe can be arranged at the upper port of any cold end of the inner layer or the outer layer.

The 4U-shaped tubular heat pipes 1 with two serpentine cold ends 40 in fig. 13 are symmetrically arranged to form a cylindrical body, i.e., each U-shaped tubular heat pipe 1 with two serpentine cold ends 40 occupies about a quarter of a circumferential angle of the cylindrical body, which is more visually seen in the top view of the schematic structural diagram of fig. 14.

Likewise, it is also possible to have the U-shaped modified tubular heat pipes 1 of the embodiment of fig. 13 and 14 with two serpentine segments of cold ends 40 each occupying about one-half or one-third or one-fifth or one-sixth of the circumferential angle of the cylindrical body.

The height of the LED lamp with the serpentine upward cold end 40 can be only 30% of the height of the upward cold end.

The heat pipe LED lamp of the embodiment of fig. 13 and 14 may also use only a single heat pipe 1 and extend its hot end 38 to approximate a circle, with a plurality of LEDs 2 disposed on the hot end 38 of the heat pipe.

Fig. 15 and 16 show a ninth embodiment of the present invention.

In fig. 15 and 16, the hot end 38 of the U-shaped tubular heat pipe 1 with two cold ends 40 extending at equal angles upward is in heat transfer connection with an LED 2. The inner layer of heat pipe cold end 40 is shown in light color. The outer heat pipe cold ends 40 are shown in dark color. Each hot side 38 may be thermally coupled to more than one LED 2. All of the LEDs 2 are equally spaced on the hot end 38 of the heat pipe 1 according to the heat dissipation load. The height of the LED lamp adopting the equal-angle inclined upper cold end 40 can be only 30% of that of the straight upper cold end.

It is also possible to expand the number of U-shaped tubular heat pipes 1 with two serpentine segments of the cold ends 40 in the embodiment of fig. 15 and 16 to a plurality and to nest them in a uniform spacing with their own cylinders each occupying about one-half or one-third or one-fourth or one-fifth of the circumferential angle of the own cylinder.

The heat pipe LED lamp of the two embodiments of FIGS. 13 and 14 and FIGS. 15 and 16 is suitable for manufacturing an LED shadowless lamp. Shadowless lamps need to change their spatial state continuously. Even if the shadowless lamp lighting surface is inclined by 29 degrees in a positive and negative way, the working medium at the cold end can still be ensured to normally flow back by adopting the plurality of U-shaped deformed tubular heat pipes. The heat pipe manufactured by adopting the bent pipe is suitable for mass production and has high yield. And the whole machine can still work when part of the heat pipe or the LED is damaged.

The heat pipe LED light fixture of the embodiment of fig. 15 and 16 may also have its heat pipe hot end 38 elongated to approximate a circle and have a plurality of LEDs 2 disposed on the hot end 38.

Fig. 17 and 18 together show a tenth embodiment of the invention.

In fig. 17 and 18, the heat pipe LED lamp includes a heat pipe 1, an LED2, a driving power supply 42, and an electrical connection interface 5 with the outside. The outer side of the hot end of the heat pipe 1 contains an LED circuit board 11. The heat pipe 1 is of a jacket structure with two open ends, and is beneficial to accelerating the rising of hot air in a hollow part to enhance the heat exchange of the surface of a cold end. The surface of the inner jacket tube as the cold end 40 contains a plurality of folds 43. The driving power source 42 is disposed inside the heat pipe 1, and may be connected to the heat pipe 1 by an adhesive connection. The exhaust pipe 7 of the heat pipe 1 is arranged on the inner wall of the jacket.

The folds in the inner tube of the embodiment of fig. 17 and 18 can increase the heat dissipation area by up to approximately 30%, and can reduce the temperature of the LED2 by as much as 4 to 6 ℃.

Fig. 19 shows an eleventh embodiment of the present invention.

In fig. 19, the heat pipe LED spot lamp includes a heat pipe 1, an LED2, a driving power supply 42, an electrical connection interface 5 with the outside, a condenser lens 44, and a housing 45. The electrical connection interface 5 with the outside is a twisted pair. The heat pipe 1 is machined at the hot end 38 to have a rectangular cross-section for improved heat transfer efficiency with the LEDs 2. The cold end 40 of the heat pipe 1 is bent in a serpentine shape to extend monotonically upward and to accommodate the integral bending of the condenser lens 44 and the housing 45 to ensure working fluid return. The heat pipe 1 is arranged on the rear side of the condenser lens 44 within the housing 45 together with the driving power source 42. The condenser lens 44 collects the lamp light to form a spot effect.

It is important to emphasize that: the utility model discloses the hot junction surface of heat pipe can be processed into the plane or be similar to the plane for improving with LED 2's heat transfer efficiency partially. In this case, the cross-section of the heat pipe case processed to be flat or approximately flat may include a straight line corresponding to the flat surface and various other shapes.

Fig. 20 shows a twelfth embodiment of the present invention.

In fig. 20, the LED wall lamp includes a jacketed heat pipe 1, an LED2, an electrical connection interface 5 with the outside, and a driving power source 42. The light emitting surface of the LED2 and the hot end of the jacketed heat pipe 1 are bonded with a transparent adhesive such as silicone. The light emitting surface of the LED2 is bonded with the hot end of the heat pipe 1. The light emitted by the LED2 is radiated through the wall of the two-layer heat pipe 1. More than one of the four surfaces of the two layers of pipe walls of the heat pipe 1 is subjected to frosting treatment to achieve the effect of light homogenizing.

Fig. 21 shows a thirteenth embodiment of the present invention.

In fig. 21, the LED crystal-like pendant lamp array includes a heat pipe 1, an LED2, a cup-shaped light homogenizing sheet 6 and a driving power supply 42, and is connected to an external power supply by a flexible wire.

The embodiment of fig. 21 has slow light decay because the LEDs always maintain good operating conditions. Thus helping to maintain light color consistency over long periods of time. The crystal ceiling lamp can give people a feeling of extremely high quality.

Fig. 22 shows a fourteenth embodiment of the present invention.

In fig. 22, the LED ceiling lamp includes a heat pipe 1, an LED2, a driving power supply 42, and a housing 45. The hot end 38 of the heat pipe 1 is bent into a rounded rectangle arranged along the inner side of the perimeter of the housing 45 and in heat transfer connection with the LEDs 2. The two cold ends 40 of the heat pipe 1 are respectively wound upwards for more than one turn in the form of a rounded rectangle from the two ends of the hot end 38. The cold end 40 is shown in two views as thicker and thinner solid and dashed lines, respectively. The finished product of the embodiment of fig. 21, an LED fixture with 40 watts power, a height that can be only 35 mm, is reduced in weight from 3.2 kg for the same specification cast aluminum heat sink fixture to 0.9 kg; the heat dissipation capability is also greatly improved.

Fig. 23 and 24 show a fifteenth embodiment of the present invention.

In fig. 23 and 24, the heat pipe LED traffic signal includes a heat pipe 1, an LED2, a drive power supply 42, a housing 45, a rail base 46, and a heat pipe chute-type mounting interface. The heat pipe 1 comprises plane hot ends 38 and a rod-shaped cold end 40 with a horizontal inclination angle, wherein the plane hot ends 38 are spliced to form a large vertical plane, and the front surface of each plane hot end 38, namely the front surface is bonded with an LED2 to form a display interface. The sliding groove type mounting interface is an aluminum profile component and comprises a connecting surface 47 which can be bonded with the back surface of the plane hot end 38 of the heat pipe 1 and two sliding grooves 49 which are arranged on two sides and can be matched and slidably connected with the two guide rail bases 46 on the two sides. During maintenance, the heat pipe chute-type mounting interface can be pulled out directly along the guide rail base 46. The heat pipe 1 is bonded to the joint surface 47. The LED2 is adhered to the front of the hot end of the heat pipe 1 by heat conducting glue. The hot end of a heat pipe 1 may have multiple LEDs 2 bonded thereto, including LEDs 2 that emit different colors of light. When the hot end of a glass heat pipe 1 is bonded with three LEDs 2 with different colors, a traffic signal lamp with three colors can be manufactured. The traffic signal lamp integrated by three colors saves materials.

The heat pipe 1 in the embodiment of fig. 23 and 24 adopts the rod-shaped cold end 40 which extends backwards, so that the heat can be sufficiently and uniformly dissipated, and the requirement of large-area dense installation of the traffic signal lamp LEDs 2 is met.

Fig. 25 shows a sixteenth embodiment of the present invention.

In fig. 25, the upper half parabolic rotator jacket heat pipe LED lamp includes an upper half parabolic rotator jacket 50, i.e., a heat pipe 1, an LED2, a lower half parabolic rotator 51, and a driving power source 42. The inner half jacket of the heat pipe 1 of the upper half paraboloid rotator jacket 50 is in the shape of a substantially paraboloid rotator which forms a complete substantially paraboloid rotator together with the lower half paraboloid rotator 51 and on which the mirror surface for converting the light emitted from the point light source LED2 into a substantially light column is coated.

The embodiment of fig. 25 utilizes the upper half paraboloid of revolution solid jacket 50 as a heat pipe to achieve a heat dissipation area of 100 to 300 square centimeters, suitable for 8 to 25 watt LED lighting including mining lights, automotive lights and small projector lighting. The lower half-rotating body 51 can be made of plastic or metal. The parabolic rotating body may be appropriately deformed as necessary.

Fig. 26 shows a seventeenth embodiment of the present invention.

In fig. 26, the inverted parabolic spinner heat pipe LED lamp includes an inverted parabolic spinner jacket 52, i.e., heat pipe 1, LED2 and drive power supply 42. Inside the inverted parabolic rotator jacket 52 is a parabolic rotator with mirrors fabricated thereon for converting the light from the point source LED2 into a general column of light. The rim of the parabolic spinner jacket 52 is smooth and has a width comparable to the width of the LED2 for heat transfer connection with the LED 2. The electrical connection interface 5 is a two-wire.

The embodiment of fig. 26 uses the inverted paraboloidal rotator jacket 52 as the heat pipe 1, which can obtain a heat dissipation area of 100 to 600 square centimeters, and is suitable for an 8 to 50 watt LED lamp with a light emitting area, i.e. the rim of the paraboloidal rotator jacket 52 is a circle and can be horizontally arranged. When the liquid absorption core net is arranged in the heat pipe 1, the liquid absorption core net is insensitive to the change of the inclination angle of the heat pipe, and the edge of the parabolic rotating body jacket 52 of the light-emitting area can work normally within the horizontal inclination angle range of plus or minus 10 degrees. Fig. 27 is a schematic structural diagram of a plate-shaped heat pipe LED lamp.

Fig. 27 shows an eighteenth embodiment of the present invention.

In fig. 27, the plate-shaped heat pipe LED lamp includes one plate-shaped heat pipe 1, an LED2, and a driving power supply 42. The electrical connection interface 5 is a two-wire. The LEDs 2 of the embodiment of fig. 27 are uniformly distributed under the plate-shaped heat pipe 1, and a planar lighting effect can be obtained. When the wick net 53 is arranged inside the plate-shaped heat pipe 1, the plate-shaped heat pipe 1 can be made to normally operate within a horizontal inclination angle range of plus or minus 10 ° or more. When the liquid absorbing capacity of the liquid absorbing core net 53 can ensure that the working medium of the plate-shaped heat pipe 1 is conveyed to each LED2 through capillary action to be evaporated by the heat emission of the LEDs 2, even the light emitting surfaces of the evenly distributed LEDs 2 can be upward and normally work within the horizontal inclination angle range of plus or minus 10 degrees or more. In order to overcome the pressure difference between the two sides of the tube wall of the plate-shaped heat pipe 1, i.e. the difference between about 0.1 atmosphere inside and 1 atmosphere outside, a support 54 is arranged inside the plate-shaped heat pipe 1 to support the two inner walls of the plate-shaped heat pipe 1 from the inside. The outward convex bubble 55 on the wall of the plate-shaped heat pipe 1 without the LED2 can greatly increase the area of the cold end of the plate-shaped heat pipe 1.

The wall thickness of the heat pipe with the bubble 55 is reduced. The heat pipe cleaning with the bubble 55 is somewhat cumbersome. The titanium dioxide photocatalyst coating is coated on the pipe wall of the heat pipe 1, and organic dirt contacting with the titanium dioxide coating can be continuously decomposed by utilizing the light of a lamp to form simple molecules such as nitrogen, carbon dioxide, water and the like. Coating the titanium dioxide photocatalyst coating on the pipe wall of the heat pipe 1 can be realized by referring to the prior art.

The front profile of the heat pipe of the embodiment of fig. 27 may be other than a rounded rectangle, such as an oval above fig. 27. Thus, the good compression resistance of the arch structure can be utilized, the size can be miniaturized, the capillary action section of the liquid absorption core net is not too long, and the slightly arched luminous surface irradiation angle is superior to that of a plane.

The plate-shaped heat pipe 1 of the embodiment of fig. 27 can be manufactured by referring to the contents of the first two embodiments 16 and 17.

Claims

1. The cold end direct heat dissipation heat pipe LED lamp comprises a heat pipe, an LED, a driving power supply and an electrical connection interface with the outside, wherein the heat pipe comprises a pipe shell, an exhaust pipe, a working medium and a liquid absorption core network; the cold end of the heat pipe is provided with or not provided with folds; the electric connection interface with the outside comprises a two-core electric wire or a bulb screw connector; when the color or the color temperature of the LEDs is constant, the LEDs forming the color or the color temperature comprise three-primary-color LEDs and can be electrically connected with the outside only by one group of two leads; when the color or the color temperature of the LEDs is adjustable, the LEDs forming the color or the color temperature respectively adopt a group of two leads to realize the electrical connection with the outside, and the LED color or the color temperature is adjustable; the cold end of the heat pipe is not provided with a fin plate.

2. The LED lamp with the direct heat-dissipation heat pipe at the cold end according to claim 1, wherein an LED circuit board is arranged on the outer side of the hot end of the heat pipe, and the inner side surface of the LED circuit board is matched with the outer surface of the hot end of the heat pipe; the LED circuit board comprises an insulating substrate, and a conductive circuit, an LED connecting interface, a circuit board reinforcing layer and meshes which are manufactured on the insulating substrate; the LED connection interface comprises a soldering interface; the reinforcing layer comprises a porous steel plate or an elastic screen plate embedded in the insulating substrate; the LED circuit board and the driving power supply are connected through a plurality of cables, and the connection of the LED circuit board and the driving power supply comprises mechanical connection, electrical connection and binding connection of the heat pipes at the same time; the connection of the LED circuit board and the driving power supply comprises the realization of a cable connection interface around the LED circuit board or the driving power supply; the cable connection interface includes a cable-wound stub; or, the driving power supply adopts a structure that a driving power supply main body is connected with a driving power supply base; the driving power supply main body is provided with a contact piece, the driving power supply base is provided with a cable clamping groove, and the contact piece and the cable clamping groove are electrically connected after the driving power supply main body and the driving power supply base are connected in a matched mode; and a quick-connection cable with a cable clamping end and an elastic piece connected in series/parallel is adopted; the quick-connection cable has high enough tensile strength; the elastic piece comprises a section of spring, and the cable clamping end is connected with the cable clamping groove in a clamping manner; the connection between the LED circuit board and the quick-connection cable comprises welding connection or quick-connection, and the quick-connection comprises the clamping connection.

3. The cold-end direct heat dissipation heat pipe LED lamp of claim 2, wherein the LED circuit board comprises a plurality of LED holes, and the edge of each LED hole comprises more than two connecting interfaces with the LED; the LED is arranged in the LED hole and is in heat transfer connection with the hot end of the heat pipe through heat conducting materials including an elastic heat conducting film and a transparent heat conducting bonding material.

4. The cold-end direct heat dissipation heat pipe LED lamp of claim 2, wherein the LED connection interface on the LED circuit board is a stainless steel sheet arranged on the circuit board; both ends of the LED respectively comprise a stainless steel sheet stitch welding flat sheet with a corrugated transition section; the two stainless steel sheets, namely the stainless steel sheet on the circuit board and the stitch welding flat sheet are mutually overlapped and contain welding connection parts of laser stitch welding.

5. The cold-end direct heat dissipation heat pipe LED lamp of claim 2, wherein the LED circuit board comprises a flexible circuit board;

the surface of the LED in heat transfer connection with the hot end of the heat pipe contains an elastic heat-conducting film with the shape matched with the surface of the hot end of the heat pipe; the heat pipe comprises a connecting interface with the LED circuit board and the driving power supply or the driving power supply base, and the connecting interface comprises a threaded connecting interface with the LED circuit board and the driving power supply or the driving power supply base; the connecting interface also comprises more than one positioning step which protrudes outwards, and the surfaces of the LED circuit board and the driving power supply or the driving power supply base respectively comprise connecting interfaces which are matched with the surfaces of the positioning steps; or,

the heat pipe comprises a plurality of attached radiating fins or attached radiating fin groups which are in heat transfer connection with the cold ends of the heat pipes; the surface of the LED in heat transfer connection with the hot end of the heat pipe and the surface of the contact part of the attached radiating fin or the attached radiating fin group and the heat pipe contain heat-conducting glue or an elastic heat-conducting film with the shape matched with the surface of the hot end of the heat pipe; the heat pipe comprises a connecting interface with the LED circuit board and the driving power supply or the driving power supply base, and the connecting interface comprises a threaded connecting interface with the LED circuit board and the driving power supply or the driving power supply base; the connecting interface also comprises more than one positioning step which protrudes outwards, and the surfaces of the LED circuit board and the driving power supply or the driving power supply base respectively comprise connecting interfaces which are matched with the surfaces of the positioning steps.

6. The cold-end direct heat dissipation heat pipe LED lamp of claim 2, wherein the LED circuit board comprises a quick-connect cable with a sleeve buckle at one end and without being connected in series with an elastic piece; the driving power supply base comprises a telescopic spring hook; the quick-connection cable is sleeved with the spring hook to realize electrical and mechanical connection between the quick-connection cable and the spring hook; or the LED circuit board comprises a quick-connection cable with a sleeve buckle at one end and not connected with the elastic piece in series; the driving power supply base comprises a flexible springboard hook; the quick connection cable is sleeved with the elastic plate hook to realize electrical and mechanical connection between the quick connection cable and the elastic plate hook.

7. The cold end direct heat dissipation heat pipe LED lamp of claim 1, wherein both ends of the LED each comprise a heat pipe shell snap spring member, the snap spring member comprises two spring plates, and the free end of each spring plate comprises more than one pin; the clamp spring piece is connected with the hot end of the heat pipe in a heat transfer way; the contact pin can be inserted into a contact pin base to realize the electrical connection between the contact pin and the contact pin base.

8. The cold end direct heat dissipation heat pipe LED lamp of claim 1, further comprising a light homogenizing sheet; the hot end or the boundary of the hot end of the heat pipe and the inner side of the uniform light sheet respectively comprise a uniform light sheet magnetic connecting interface; the magnetic connecting interface comprises the following materials: paramagnetic material + permanent magnetic material or permanent magnetic material + permanent magnetic material; the two uniform light sheet magnetic connecting interfaces are magnetically connected.

9. The cold-end direct heat dissipation heat pipe LED lamp as claimed in claim 1, 2, 7 or 8, wherein the LED lamp comprises more than one heat pipe, including a heat pipe with more than one cold end, a U-shaped tubular heat pipe with two cold ends, and a multi-cold-end heat pipe with a main cold end comprising two main cold ends of a U-shaped tubular heat pipe and a branch cold end connected to the main cold end in a bypass manner; each cold end comprises a cold end which is straight upwards, spirally bent upwards and snakelike bent upwards; all the LEDs are uniformly distributed at the hot end of each heat pipe according to the heat dissipation load.

10. The cold-end direct heat dissipation heat pipe LED lamp as claimed in claim 1, 2, 7 or 8, wherein the cold end of the heat pipe does not contain a dedicated heat sink; or the cold end of the heat pipe has a large surface area surface including folds.