CN203797469U - Convection heat radiation type high-power LED (light emitting diode) street lamp - Google Patents
Convection heat radiation type high-power LED (light emitting diode) street lamp Download PDFInfo
- Publication number
- CN203797469U CN203797469U CN201420149787.3U CN201420149787U CN203797469U CN 203797469 U CN203797469 U CN 203797469U CN 201420149787 U CN201420149787 U CN 201420149787U CN 203797469 U CN203797469 U CN 203797469U
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- heat radiation
- light source
- heat
- led
- street lamp
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- Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
Abstract
The utility model relates to the technical field of LED (light emitting diode) illumination, in particular to a convection heat radiation type high-power LED street lamp. The convection heat radiation type high-power LED street lamp comprises a lamp holder component, an LED light source component and a heat radiation substrate. One end of the lamp holder component is integrally fixed with the heat radiation substrate through a fixing part, and the heat radiation substrate comprises a light source fixing portion in the middle and heat radiation portions on two sides of the light source fixing portion. The heat radiation substrate serves as both a lamp cavity and a heat radiation cavity, the LED light source component is fixed onto the light source fixing portion through the fixing part, and accordingly the heat radiation area between the LED light source component and the heat radiation substrate is widened; a plurality of heat radiation strips which are integrally formed with the heat radiation portions are arrayed on the heat radiation portions, heat radiation holes are formed among adjacent heat radiation strips, and the heat radiation areas of the heat radiation strips are large and further widened due to the heat radiation holes, so that rapid heat radiation is facilitated even in severe environments, and the service life of the lamp is prolonged.
Description
Technical field
The utility model relates to LED lighting technical field, refers in particular to a kind of high-power LED street lamp of convection type heat radiation.
Background technology
LED is energy-efficient, safe and reliable with it, the superiority of long service life obtains social accreditation and application widely, along with the appearance of high light large power LED, the application of LED is expanded to road lighting from the lamp of giving instruction, instrument board.But there is the problem of dissipation of heat difficulty, the service life of seriously having reduced LED in LED large power road lamp at present.
For solving this drawback, must solve the heat dissipation problem of light fixture.The radiator of tradition LED street lamp is normally vertically installed in the top of LED light source, and is exposed to housing outside, the easy ponding of this structure, is easily covered by dust, affects radiating effect.On the other hand, traditional LED street lamp casing, great majority adopt die casting aluminum hull, and LED light source is contained in the inside cavity of large volume, with oil lamp cover cover, and radiator is contained on housing, and this construction weight is large, and area of dissipation cannot ensure, easily causes dispelling the heat bad.Therefore generally adopt light fixture cavity Air Flow to take away heat, improve heat radiation.Its heat abstractor adopting has air inlet and gas outlet, communicates or directly communicate with atmosphere by conduit with atmosphere, has air inlet below conduit, and there is gas outlet top, and heat radiation chamber forms by fin is airtight.Its weak point is owing to adopting one or two radiating tube to serve as heat radiation chamber, the area of air and radiating tube heat exchange is large not, and the heat of taking away when Air Flow is few, makes the efficiency of heat exchange not high, heat-dissipating cavity is airtight form in addition, and air is difficult for forming free convection mode.
In actual applications, atrocious weather is as haze weather, extreme hot weather, violent typhoon weather etc., in the time that traditional LED street lamp is faced this environment, radiating effect is had a greatly reduced quality, LED be can accelerate and light decay or dead lamp occurred, larger by the LED street lamp windage of aluminium alloy heat radiator, there is safety problem.
Utility model content
The utility model provides a kind of high-power LED street lamp of convection type heat radiation for the problem of prior art, have good heat dispersion, to extend the service life of street lamp
In order to solve the problems of the technologies described above, the utility model adopts following technical scheme:
A kind of high-power LED street lamp of convection type heat radiation, comprise lamp adapter assembly, LED light source assembly and heat-radiating substrate, one end of described lamp adapter assembly is fixedly connected with heat-radiating substrate by fixture, described heat-radiating substrate comprises the radiating part that is positioned at its middle light source fixed part and is positioned at its both sides, described LED light source assembly is fixedly installed on light source fixed part, described radiating part is array and is provided with integrated multiple heat radiation strip shape bodies with it, between adjacent heat radiation strip shape body, forms louvre.
Further, described heat radiation strip shape body comprises lower bending heat sink strip and upper arch heat sink strip, and described lower bending heat sink strip and upper arch heat sink strip are spaced distribution between two, and lower bending heat sink strip and upper arch heat sink strip form heat dissipation channel jointly.
Wherein, the radiating part of described light source fixed part and both sides forms Baltimore groove, is provided with the fixed head mating with it on described Baltimore groove, and one end of described fixed head and one end of lamp adapter assembly removably connect, and the below of fixed head is fixedly connected with light source fixed part.
Wherein, the top of described heat-radiating substrate is provided with the case that the radiating part of both sides can be covered completely, and described case and heat-radiating substrate removably connect, and states case and is provided with many row's air vents corresponding to louvre place.
Wherein, described lamp adapter assembly includes upper cover body and lower cover, between upper cover body and lower cover, is connected to form a power supply cavity by screw, and is fixedly installed driving power in described power supply cavity; Described upper cover body is provided with electric wire chamber, and described electric wire is provided with a wire connector in chamber, and the input power cord of civil power input power cord and LED light source assembly is all communicated with driving power by wire connector.
Further, the top open part in described electric wire chamber is provided with waterproof flange collar and electric wire cover plate, and described electric wire cover plate and electric wire chamber are fastened and connected, and the upper surface butt of the lower surface of electric wire cover plate and waterproof flange collar.
Further, the other end of described lamp adapter assembly is provided with rotating connector, and described connector comprises sleeve and arc contiguous block, and described arc contiguous block is located at one end of sleeve and the inwall of arc contiguous block is provided with location teeth groove; Corresponding described arc contiguous block is provided with joint pin in described power supply cavity, is provided with and the location tooth bar of locating teeth groove and cooperatively interacting in one end of joint pin; On described arc contiguous block, be provided with spacing hole, described arc contiguous block passes spacing hole by securing member and is connected with joint pin is adjustable.
Wherein, described LED light source assembly comprises LED chip, for LED substrate and the diffuser of LED chip are installed, and described diffuser is fixedly installed on the below of LED chip light-emitting area; Described heat-radiating substrate is provided with light source fixed head corresponding to described LED substrate place coupling, and described light source fixed head passes heat-radiating substrate by fixture and LED substrate in combination is fixed, and the upper surface of LED chip directly contacts with the lower surface of heat-radiating substrate.
Further, between described LED substrate, light source fixed head and heat-radiating substrate, be provided with the sealing ring for waterproof, on described LED substrate, light source fixed head, be respectively arranged with the sealed groove for accommodating sealing ring, after described LED substrate, light source fixed head and heat-radiating substrate are fixing, described sealing ring is fixed and clamped in sealed groove.
Further, on described sealing ring, be evenly provided with multiple positioning convex strips, and positioning convex strip and sealing ring one-body molded; The corresponding described positioning convex strip of described sealed groove is provided with multiple positioning through hole, and after described sealing ring is pressed in sealed groove, some length of described positioning convex strip passes positioning through hole.
The beneficial effects of the utility model:
The high-power LED street lamp of a kind of convection type heat radiation provided by the utility model, comprise lamp adapter assembly, LED light source assembly and heat-radiating substrate, one end of lamp adapter assembly is fixed together by fixture and heat-radiating substrate, and heat-radiating substrate comprises the radiating part that is positioned at its middle light source fixed part and is positioned at its both sides; Heat-radiating substrate of the present utility model is that light fixture cavity is heat radiation chamber again, and LED light source assembly is fixed on light source fixed part by fixture, has increased the area of dissipation between LED light source assembly and heat-radiating substrate; On radiating part, be array and be provided with integrated multiple heat radiation strip shape bodies with it, between adjacent heat radiation strip shape body, form louvre.The area of dissipation of heat radiation strip shape body is larger, and louvre has also increased area of dissipation, though in environment more severe, these are all conducive to scattering and disappearing fast of heat, extend the service life of light fixture.
Brief description of the drawings
Fig. 1 is the structural representation one of the high-power LED street lamp of a kind of convection type heat radiation of the utility model;
Fig. 2 is the structural representation two of the high-power LED street lamp of a kind of convection type heat radiation of the utility model;
Fig. 3 is the structural representation three of the high-power LED street lamp of a kind of convection type heat radiation of the utility model;
Fig. 4 is the high-power LED street lamp of a kind of convection type of the utility model heat radiation structural representation in the time concealing case;
Fig. 5 is the STRUCTURE DECOMPOSITION schematic diagram of the high-power LED street lamp of a kind of convection type heat radiation of the utility model;
Fig. 6 is the structural representation that in the high-power LED street lamp of a kind of convection type of the utility model heat radiation, LED light source assembly and heat-radiating substrate combine;
Fig. 7 is the front view that in the high-power LED street lamp of a kind of convection type of the utility model heat radiation, LED light source assembly and heat-radiating substrate combine.
Reference numeral in Fig. 1 to Fig. 7 comprises:
1-lamp adapter assembly, 11-upper cover body, 12-lower cover, 13-electric wire chamber
14-wire connector, 15-waterproof flange collar, 16-electric wire cover plate, 2-LED light source assembly
21-LED chip, 22-LED substrate, 23-diffuser, 24-light source fixed head
3-heat-radiating substrate, 31-light source fixed part, 32-radiating part 33-heat radiation strip shape body
331-lower bending heat sink strip 332-upper arch heat sink strip 34-louvre 35-Baltimore groove
4-fixed head, 5-case, 51-air vent, 6-connector
61-sleeve, 62-arc contiguous block 63-location teeth groove 64-spacing hole
7-sealing ring, 8-sealed groove, 9-positioning convex strip, 10-positioning through hole.
Detailed description of the invention
For the ease of those skilled in the art's understanding, below in conjunction with embodiment and accompanying drawing, the utility model is further described, the content that embodiment is mentioned is not to restriction of the present utility model.Referring to Fig. 1 to Fig. 7, below in conjunction with accompanying drawing, the utility model is described in detail.
The high-power LED street lamp of a kind of convection type heat radiation provided by the utility model, comprise lamp adapter assembly 1, LED light source assembly 2 and heat-radiating substrate 3, one end of described lamp adapter assembly 1 is fixed together by fixture and heat-radiating substrate 2, and described fixture is screw in the present embodiment.As shown in Figure 1, heat-radiating substrate 3 is not only as being light fixture cavity but also conduct heat radiation chamber, described heat-radiating substrate 3 comprises the radiating part 32 that is positioned at its middle light source fixed part 31 and is positioned at its both sides, described LED light source assembly 2 is fixed on light source fixed part 31 by fixture (being screw), has increased the contact area between LED light source assembly 2 and heat-radiating substrate 3; On described radiating part 31, be array and be provided with integrated multiple heat radiation strip shape bodies 33 with it, between adjacent heat radiation strip shape body 33, form louvre 34.Further, described heat radiation strip shape body 33 comprises lower bending heat sink strip 331 and upper arch heat sink strip 332, described lower bending heat sink strip 331 and upper arch heat sink strip 332 are spaced distribution between two, and lower bending heat sink strip 331 and the common heat dissipation channel that forms of upper arch heat sink strip 332.Because the area of dissipation of heat radiation strip shape body 331 is larger, louvre 34 has also increased area of dissipation, even if the present environment of this high-power LED street lamp is more severe, these are all conducive to scattering and disappearing fast of heat, can extend the service life of light fixture.In addition, the radiating part 32 of the heat-radiating substrate 3 in the utility model is positioned at its both sides, and traditional LED radiator is generally the aluminium radiator of die cast, and its heat radiation is more concentrated, and the radiating rate of the relative the utility model heat-radiating substrate 3 of its radiating rate is slow.
Because LED light source assembly 2 is installed on heat-radiating substrate 3, therefore heat-radiating substrate 3 has born the gravitational load of LED light source assembly 2.As shown in Figure 5, described light source fixed part 31 forms Baltimore groove 35 with the radiating part 32 of both sides, on described Baltimore groove 35, be provided with the fixed head 4 mating with it, one end of one end of described fixed head 4 and lamp adapter assembly 1 removably connects, and the below of fixed head 4 is fixedly connected with light source fixed part 31.In the present embodiment, two groups of LED light source assemblies 2 and heat-radiating substrate 3 are installed on fixed head 4, fixed head 4 is played a supporting role to heat-radiating substrate 3 and LED light source assembly 2, is convenient to the assembling of LED light source assembly 2 and heat-radiating substrate 3; And heat-radiating substrate 3 and LED light source assembly 2 are combined closely, make heat transmission between the two faster.
As another preferred embodiment, the top of described heat-radiating substrate 3 is provided with the case 5 that the radiating part of both sides 32 can be covered completely, and described case 5 removably connects with heat-radiating substrate 32, states case 5 and is provided with many row's air vents 51 corresponding to louvre 34 places.LED street lamp provided by the utility model is the both sides of highway being applied under the environment that day Sai drenches with rain, therefore case 5 is set on heat-radiating substrate 3 can avoid heat-radiating substrate 3 to be exposed to the sun by day and cause material accelerated ageing, case 5 can make rainwater on lamp body along the ground of dripping on rainy day, has avoided heat-radiating substrate 3 to occur ponding situation.
In the present embodiment, described lamp adapter assembly 1 includes upper cover body 11 and lower cover 12, between upper cover body 11 and lower cover 12, is connected to form a power supply cavity by screw, and is fixedly installed driving power (not marking in the drawings) in described power supply cavity; Described upper cover body 11 is provided with electric wire chamber 13, is provided with a wire connector 14 in described electric wire chamber 13, and the input power cord of civil power input power cord and LED light source assembly 2 is all communicated with driving power by wire connector 14.Further, the top open part in described electric wire chamber 13 is provided with waterproof flange collar 15 and electric wire cover plate 16, and described electric wire cover plate 16 is fastened and connected with electric wire chamber 13, and the upper surface butt of the lower surface of electric wire cover plate 16 and waterproof flange collar 15.The electric power connection line of street lamp that tradition is used is generally positioned at lamp body outside, and the joint of connecting line is exposed to outside and has potential safety hazard.The civil power input power cord of LED street lamp of the present utility model and the input power cord of LED light source assembly 2 are all connected in the electric wire chamber 13 with water-proof function, and be to carry out solidus connection by wire connector 14, not only solve the potential safety hazard of the joint of connecting line, and be convenient to carry out fast-wiring.
Further, the other end of described lamp adapter assembly 1 is provided with rotating connector 6, and described connector 6 comprises sleeve 61 and arc contiguous block 62, and described arc contiguous block 62 is located at one end of sleeve 61 and the inwall of arc contiguous block 62 is provided with location teeth groove 63; Described sleeve 61 is one-body molded with arc contiguous block 62 in the present embodiment, and this makes arc contiguous block 62 have higher intensity, can easily not occur bending and deformation; And sleeve 61 both can coordinate square lamp stand use also can coordinate circular lamp stand to use.Corresponding described arc contiguous block 62 is provided with joint pin (not marking in the drawings) in described power supply cavity, is provided with and the location tooth bar of locating teeth groove 63 and cooperatively interacting in one end of joint pin; On described arc contiguous block 62, be provided with spacing hole 64, described arc contiguous block 62 is connected with joint pin is adjustable through spacing hole 64 by securing member (this securing member is preferably hex bolts in the present embodiment).
In the time that high-power LED street lamp described in the utility model is installed, arc contiguous block 62 passes spacing hole 64 by hex bolts and pre-fixes with joint pin, then the location teeth groove of arc contiguous block 62 63 and the location tooth bar of joint pin intermeshed and turn to a certain predetermined angular, then hex bolts further tightens together arc contiguous block 62 with joint pin.In the time that needs are adjusted lighting angle, only need unclamp a little hex bolts, after then lamp adapter assembly 1 rotates a certain angle around the location teeth groove 63 of connector 6, fix once again hex bolts, reach the lighting angle of quick adjustment LED street lamp.
Please refer to Fig. 5 to Fig. 7, in the present embodiment, described LED light source assembly 2 comprises LED chip 21, for LED substrate 22 and the diffuser 23 of LED chip 21 are installed, and described diffuser 23 is fixedly installed on the below of LED chip 21 light-emitting areas; Described heat-radiating substrate 3 is provided with light source fixed head 24 corresponding to described LED substrate 22 place's couplings, described light source fixed head 4 is fixing with 22 combinations of LED substrate through the light source fixed part 31 of heat-radiating substrate 3 by fixture (being screw), and the upper surface of LED chip 21 directly contacts with light source fixed part 31 lower surfaces of heat-radiating substrate 3.The heat that LED chip 21 produces in the time of work is directly passed to light source fixed part 31, then diffuses to the radiating part 32 of both sides, makes scattering and disappearing fast of heat, extends the service life of street lamp.
Further, between described LED substrate 22, light source fixed head 24 and heat-radiating substrate 3, be provided with the sealing ring 7 for waterproof, on described LED substrate 22, light source fixed head 24, be respectively arranged with the sealed groove 8 for accommodating sealing ring 7, after described LED substrate 22, light source fixed head 24 are fixed with heat-radiating substrate 3, described sealing ring 3 is fixed and clamped in sealed groove 8.Because LED chip 21 is core components of whole LED street lamp, the security of LED chip 21 is vital; Between LED substrate 22 and heat-radiating substrate 3, be respectively arranged with a sealing ring 7 for waterproof between light source fixed head 24 and heat-radiating substrate 3, there is very strong water resistance, even if LED street lamp is under the bad weather such as violent typhoon, heavy rain environment, still can not be subject to the intrusion of rainwater, effectively ensure safety and the service life of LED street lamp.
Further, on described sealing ring 7, be evenly provided with multiple positioning convex strips 9, and positioning convex strip 9 is one-body molded with sealing ring 7; The corresponding described positioning convex strip 9 of described sealed groove 8 is provided with multiple positioning through hole 10, and after described sealing ring 7 is pressed in sealed groove 8, described positioning convex strip 9 some length pass positioning through hole 10.Can effectively ensure that by positioning convex strip 9 and positioning through hole 10 sealing ring 7 is pressed in sealed groove 8, there will not be sealing ring 7 to be shifted, avoid causing losing sealing effectiveness.
Above content is only preferred embodiment of the present utility model, for those of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications, this description should not be construed as restriction of the present utility model.
Claims (10)
1. the high-power LED street lamp of a convection type heat radiation, comprise lamp adapter assembly, LED light source assembly and heat-radiating substrate, one end of described lamp adapter assembly is fixedly connected with heat-radiating substrate, it is characterized in that: described heat-radiating substrate comprises the radiating part that is positioned at its middle light source fixed part and is positioned at its both sides, described LED light source assembly is fixedly installed on light source fixed part, described radiating part is array and is provided with integrated multiple heat radiation strip shape bodies with it, between adjacent heat radiation strip shape body, forms louvre.
2. the high-power LED street lamp of a kind of convection type heat radiation according to claim 1, it is characterized in that: described heat radiation strip shape body comprises lower bending heat sink strip and upper arch heat sink strip, described lower bending heat sink strip and upper arch heat sink strip are spaced distribution between two, and lower bending heat sink strip and upper arch heat sink strip form heat dissipation channel jointly.
3. the high-power LED street lamp of a kind of convection type heat radiation according to claim 1, it is characterized in that: the radiating part of described light source fixed part and both sides forms Baltimore groove, on described Baltimore groove, be provided with the fixed head mating with it, one end of described fixed head and one end of lamp adapter assembly removably connect, and the below of fixed head is fixedly connected with light source fixed part.
4. the high-power LED street lamp of a kind of convection type heat radiation according to claim 1, it is characterized in that: the top of described heat-radiating substrate is provided with the case that the radiating part of both sides can be covered completely, described case and heat-radiating substrate removably connect, and described case is provided with many row's air vents corresponding to louvre place.
5. the high-power LED street lamp of a kind of convection type heat radiation according to claim 1, it is characterized in that: described lamp adapter assembly includes upper cover body and lower cover, between upper cover body and lower cover, be connected to form a power supply cavity by screw, and be provided with driving power in described power supply cavity; Described upper cover body is provided with electric wire chamber, and described electric wire is provided with a wire connector in chamber, and the input power cord of civil power input power cord and LED light source assembly is all communicated with driving power by wire connector.
6. the high-power LED street lamp of a kind of convection type heat radiation according to claim 5, it is characterized in that: the other end of described lamp adapter assembly is provided with rotating connector, described connector comprises sleeve and arc contiguous block, and described arc contiguous block is located at one end of sleeve and the inwall of arc contiguous block is provided with location teeth groove; Corresponding described arc contiguous block is provided with joint pin in described power supply cavity, is provided with and the location tooth bar of locating teeth groove and cooperatively interacting in one end of joint pin; On described arc contiguous block, be provided with spacing hole, described arc contiguous block passes spacing hole by securing member and is connected with joint pin is adjustable.
7. the high-power LED street lamp of a kind of convection type heat radiation according to claim 5, it is characterized in that: the top open part in described electric wire chamber is provided with waterproof flange collar and electric wire cover plate, described electric wire cover plate and electric wire chamber are fastened and connected, and the upper surface butt of the lower surface of electric wire cover plate and waterproof flange collar.
8. the high-power LED street lamp of a kind of convection type heat radiation according to claim 1, it is characterized in that: described LED light source assembly comprises LED chip, for LED substrate and the diffuser of LED chip are installed, described diffuser is fixedly installed on the below of LED chip light-emitting area; Described heat-radiating substrate is provided with light source fixed head corresponding to described LED substrate place coupling, and described light source fixed head passes heat-radiating substrate by fixture and LED substrate in combination is fixed, and the upper surface of LED chip directly contacts with the lower surface of heat-radiating substrate.
9. the high-power LED street lamp of a kind of convection type heat radiation according to claim 8, it is characterized in that: between described LED substrate, light source fixed head and heat-radiating substrate, be provided with the sealing ring for waterproof, on described LED substrate, light source fixed head, be respectively arranged with the sealed groove for accommodating sealing ring, after described LED substrate, light source fixed head and heat-radiating substrate are fixing, described sealing ring is fixed and clamped in sealed groove.
10. the high-power LED street lamp of a kind of convection type heat radiation according to claim 9, is characterized in that: on described sealing ring, be evenly provided with multiple positioning convex strips, and positioning convex strip and sealing ring one-body molded; The corresponding described positioning convex strip of described sealed groove is provided with multiple positioning through hole, and after described sealing ring is pressed in sealed groove, described positioning convex strip passes positioning through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420149787.3U CN203797469U (en) | 2014-03-31 | 2014-03-31 | Convection heat radiation type high-power LED (light emitting diode) street lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420149787.3U CN203797469U (en) | 2014-03-31 | 2014-03-31 | Convection heat radiation type high-power LED (light emitting diode) street lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203797469U true CN203797469U (en) | 2014-08-27 |
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ID=51379678
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420149787.3U Withdrawn - After Issue CN203797469U (en) | 2014-03-31 | 2014-03-31 | Convection heat radiation type high-power LED (light emitting diode) street lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203797469U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103939797A (en) * | 2014-03-31 | 2014-07-23 | 东莞勤上光电股份有限公司 | Large power LED street lamp capable of achieving convection type heat radiating |
-
2014
- 2014-03-31 CN CN201420149787.3U patent/CN203797469U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103939797A (en) * | 2014-03-31 | 2014-07-23 | 东莞勤上光电股份有限公司 | Large power LED street lamp capable of achieving convection type heat radiating |
| CN103939797B (en) * | 2014-03-31 | 2016-07-06 | 东莞勤上光电股份有限公司 | A kind of high-power LED street lamp of convection type heat radiation |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140827 Effective date of abandoning: 20160706 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |