Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
  • B60H1/00—Heating, cooling or ventilating [HVAC] devices
  • B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
  • B60H1/2215—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant the heat being derived from electric heaters
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
  • B60H1/00—Heating, cooling or ventilating [HVAC] devices
  • B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
  • B60H1/2215—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant the heat being derived from electric heaters
  • B60H1/2226—Electric heaters using radiation
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
  • B60H1/00—Heating, cooling or ventilating [HVAC] devices
  • B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
  • B60H1/2215—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant the heat being derived from electric heaters
  • B60H1/2227—Electric heaters incorporated in vehicle trim components, e.g. panels or linings

Definitions

• Radiant panel comprising a member modulating the heating power
• the field of the present invention is that of radiant panels installed in a passenger compartment of a vehicle, in particular an automobile.
• a radiant panel provides heating by emitting radiation.
• This radiation emission heating has the advantage of being less subject to fluctuations and temperature gradients than heating by hot air, while being quieter than this one.
• the use of radiant panels also makes it possible to achieve the same thermal comfort as that obtained with heating by hot air, while providing an air temperature inside the passenger compartment lower than that of the hot air heating, and this in a faster way.
• the electrical consumption dedicated to the heating of a vehicle interior can be reduced by the exclusive use of radiant panels or by the use of radiant panels in combination with the heating by hot air.
• radiant panels has the disadvantage of generating a heterogeneous heating by having, for example hot spots at the walls defining the passenger compartment.
• the integration of radiant panels in the cabin is not easy especially in terms of shapes and dimensions. Indeed, the radiant panels interfere with many other organs, functions, constraints and layout of the cabin, which does not facilitate their integration.
• the object of the present invention is therefore to provide a heat treatment assembly, intended to equip a vehicle interior, allowing heating more homogeneous radiant panel and offering a simple and inexpensive integration.
• the subject of the invention is a heat treatment assembly intended to be installed in a vehicle cabin, comprising:
• a radiant panel configured to emit at least one infrared radiation
• the reflective element (s) has an infrared reflectivity, the reflective element (s) being located opposite the radiant panel so as to generate at least a reflection of said infrared radiation.
• Such an arrangement of the element (s) reflecting (s) relative to the radiant panel allows to multiply at a lower cost sources of infrared radiation, which provides a better distribution of infrared radiation, a more homogeneous heating through a reduction hot spots.
• the presence of reflective element (s) offers ease of implantation superior to that of an additional radiant panel and is less expensive.
• the radiant panel may have a lower emission surface to the emission surfaces of the radiant panels of the prior art while providing the same thermal comfort.
• the implantation of a reflective element is easier because the element can conform to the support that adjoins the radiant panel.
• a vehicle interior is defined as a part of the vehicle in which the vehicle users, such as the driver and the passengers, settle.
• the arrangement of the radiant panel facing the at least one reflecting element means that the radiation emitted by the radiant panel is at least partly directly received by the reflective element (s).
• the arrangement of the radiant panel facing the at least one reflecting element allows at least a portion of the infrared radiation emitted by the radiant panel to reach the reflective element without crossing an intermediate along its trajectory.
• the element (s) reflective (s) has a reflectivity greater than 70% in the infrared.
• Said reflection is configured to heat-treat an area of the passenger compartment.
• the radiant panel emits, in addition to infrared radiation, a radiation in the visible.
• the visible radiation comprises wavelengths between 400 nm and 800 nm.
• the radiant panel emits, in addition to infrared radiation, a thermal radiation.
• the thermal radiation comprises wavelengths between 100 nm and 100,000 nm.
• the radiant panel emits only infrared radiation.
• the infrared radiation includes wavelengths between 750 nm and 1000 nm.
• At least part of the infrared radiation, and possibly thermal and / or visible, emitted by the radiant panel is directed directly towards an area to be heat treated and at least another part of this infrared radiation, and optionally thermal and / or visible, is reflected by the element (s) reflecting (s) towards an area of the cabin to be heat treated.
• the radiant panel is located opposite the reflective element (s) so that a factor of view between the radiant panel and the reflective element or between the radiant panel and each reflecting element is greater than 5% ⁇
• the factor of view, also called form factor, of a first surface emitting a radiation towards a second receiving surface of the radiation corresponds to the proportion of the radiation emitted by the first surface, which is captured by the second surface.
• the proportion of radiation emitted is usually expressed as a percentage.
• the radiation captured by the second surface can then be transmitted by passing for example through the second surface, absorbed by heating for example the second surface, or be reflected by the second surface.
• the form factor depends exclusively on geometric criteria. It can be measured in two different ways either by geometric calculations, or by varying the temperature of the first surface and measuring the influence on the heating of the second surface.
• the view factor between the radiant panel and the reflective element or between the radiant panel and each reflecting element is greater than 20%.
• the view factor between the radiant panel and the reflective element or between the radiant panel and each reflecting element is less than 50%.
• the radiant panel is distant from the reflective element (s). By this is meant that the radiant panel is not in contact with the single reflective element or the set of reflective elements when there are several.
• a single radiant panel is next to a single reflective element.
• the reflective element comprises a reflecting surface having an area less than an area of an emission surface of the radiant panel. In the case of a plurality of reflective elements, the sum of the areas of the reflective surfaces is smaller than the area of the emission surface of the radiant panel. Alternatively, the reflective element comprises a reflective surface having an area greater than an area of an emission surface of the radiant panel. In the case of a plurality of reflecting elements, the sum of the areas of the reflective surfaces is greater than the area of the emission surface of the radiant panel.
• the radiant panel comprises a transmitting surface of rectangular shape.
• At least one of the reflecting elements, or all the reflecting elements, comprises a reflective surface of rectangular shape.
• a rectangular shape has the advantage of being easily manufactured on a production line.
• the heat treatment assembly further comprises a sun visor flap.
• the sunshade component incorporates the radiant panel or the at least one reflecting element.
• the at least one reflective element is transparent for wavelengths between 400 nm and 800 nm.
• the element (s) reflective (s) is transparent in the visible.
• the reflective element (s) has a low emissivity in the visible.
• Such a reflective element can be applied to side windows of the vehicle or on a windshield or a rear window, without impeding the visibility of users.
• such a reflective element also makes it possible to adapt to the style of the passenger compartment in a more discreet manner.
• the at least one reflecting element (2) is reflective in the visible.
• the reflective element (s) behaves like a mirror in the visible.
• the reflective element (s) has a reflectivity greater than 70%, in addition to the infrared, in the visible. The reflective element can thus be exploited as a courtesy mirror.
• the invention also relates to a motor vehicle comprising a passenger compartment, characterized in that it comprises at least one heat treatment assembly as defined above, said heat treatment assembly being disposed in the passenger compartment.
• the radiant panel is located on a roof of the vehicle and in that the at least one reflective element is located on a shutter of a sun visor.
• the reflective element (s) is (are) located on an inner face of the shutter of the sun visor, facing the radiant panel.
• the radiant panel is located on the shutter of the sun visor and the reflective element (s) are located on the roof of the vehicle.
• the motor vehicle comprising uprights extending between a roof of the vehicle and a lower body, the radiant panel is located on at least one of the uprights and in that the at least one reflective element is located on at least a portion of a glazed element of the vehicle.
• the glazed element is a windshield, a rear window or a side window.
• the at least a portion of the glazed element is adjacent to the amount comprising the radiant panel.
• the reflective element located on the glazed element is transparent in the visible, that is to say for wavelengths between 400 nm and 800 nm.
• the presence of the reflective element does not affect the visibility of the user of the vehicle while allowing to heat an upper body.
• the reflective element occupies between 1% and 15% of the glazed element. More specifically, the reflective element extends along a border of the upright and has a width of between 0.5 cm and 10 cm.
• the motor vehicle comprising at least one cellar with feet is characterized in that the radiant panel is located on one of the walls forming the cellar with feet and in that the at least one reflecting element is located on one or more other wall (s) forming the cellar with feet.
• the cellar with feet is formed by at least five walls, including a wall forming a floor of the vehicle, a bottom wall, and at least three side walls.
• the radiant panel is disposed on the bottom wall of the cellar and the at least one reflective element is located on at least one of the side walls.
• FIG. 1 is a schematic representation of a heat treatment assembly according to the present invention
• FIG. 2 is a schematic representation of a portion of a passenger compartment of a motor vehicle, here at the level of a sun visor, incorporating the heat treatment assembly, according to a first embodiment of the invention
• FIG. 3 is a schematic representation of a portion of a passenger compartment of a motor vehicle, here at the level of an amount of the vehicle, incorporating the heat treatment assembly, according to a second embodiment of the invention
• - Figure 4 is a schematic representation of a portion of a passenger compartment of a motor vehicle, here at a cellar with feet, incorporating the heat treatment assembly, according to a third embodiment of the invention.
• FIG. 1 shows, schematically, a heat treatment assembly 10 comprising a radiant panel 1 and a reflective element 2.
• This heat treatment assembly 10 is intended to be installed in a vehicle interior, as will be described later.
• the radiant panel 1 is configured to emit infrared radiation, that is to say that the radiant panel 1 emits waves of wavelengths between 750 nanometers and 1000 nanometers (nm).
• the radiant panel 1 can emit, in addition to infrared waves, thermal waves having wavelengths between 100 nm and 100,000 nm.
• the radiant panel 1 can emit, in addition to infrared waves, visible waves of between 400 nm and 800 nm, or other types of waves.
• the radiant panel 1 emits only infrared radiation 3
• the radiation 3 emitted by the radiant panel 1 achieves a heating temperature of between 30 degrees Celsius (° C) and 80 ° C. This heating temperature is measured in contact with the radiant panel 1. However, to avoid the risk of burns, the heating temperature is preferably less than or equal to 60 ° C. Of course, the heating temperature is adjustable according to the needs of the user.
• the radiant panel 1 comprises a radiant surface from which the radiation 3 is emitted. According to the exemplary embodiments described below, this radiant surface is of rectangular shape. Of course, other forms of radiant surface are possible, for example the radiant panel 1 could have a radiant surface square or circular.
• Reflective element 2 has reflectivity in the infrared. This reflectivity is greater than or equal to 70% in the infrared. The reflectivity represents the ability of the reflecting element 2 to reflect the waves, here infrared, having wavelengths between 750 nm and 1000 nm. A reflectivity of at least 70% means that on one hundred rays incident at least seventy rays are reflected by the reflecting element 2. According to an alternative embodiment, the reflecting element 2 has a reflectivity of greater than or equal to 70% for other wavelengths, in addition to the infrared. According to an advantageous embodiment, the reflective element 2 presents a low emissivity in the visible so as to be transparent. The emissivity and reflectivity of a given surface are related to the characteristics of the material forming the given surface. One can also speak of reflectance or reflection factor corresponding to the proportion of light reflected by the surface of the panels.
• Reflective element 2 comprises a reflective surface obtained, for example, by a thin layer or particle deposition of an infrared reflective material.
• the material used is of metal type, such as aluminum. Since this deposit is capable of modifying the visible appearance and the optical characteristics of the reflecting element 2, preference will be given to the implantation of the reflecting element 2 in areas of the passenger compartment that are not likely to disturb the users.
• the reflecting element 2 is in the form of a reflective film that can be positioned on a support of the passenger compartment facing the radiant panel 1.
• the reflecting surface is rectangular.
• the reflecting element 2 could have a square or circular reflective surface.
• the reflecting surface of the reflecting element 2 is curved towards the radiant panel 1. In other words, the reflecting element 2 is convex as seen from the radiant panel 1
• the radiant panel 1 and the reflecting element 2 are arranged such that at least a portion of the radiation 3 emitted by the radiant panel 1 is received directly by the reflecting element 2 to be reflected.
• the radiation 3 emitted by the radiant panel 1 encounters no other obstacle before reaching the reflecting element 2.
• the reflecting element 2 is located opposite the radiant panel 1 so as to generate at least one reflection of the radiation 3 emitted by the radiant panel 1. It should be noted that by “opposite”, it is understood that there is at least one view factor between the radiant panel 1 and the reflective element 2 as will be detailed below in connection with FIG.
• the reflection of the radiation 3 emitted from a surface Si of the radiant panel 1 on a surface S2 of the reflecting element 2 generates a reflected radiation 4 intended to be directed towards at least one zone of the passenger compartment to be thermally treated Z, as will be described later.
• the radiation 3 emitted by the surface Si of the radiant panel 1 can also be directed towards the zone of the passenger compartment to be thermally treated Z.
• the totality of the radiation emitted by the surface Si of the radiant panel 1 is reflected. by the reflective element 2. It should be noted that the emitted ray 3 and the reflected ray 4, schematically represented in FIG.
• the reflecting element 2 may have a reflecting surface S2 smaller than the radiant surface Si of the radiant panel 1.
• the sum of the reflective surfaces S2 of the reflective elements 2 situated opposite the radiant panel 1 is smaller than the radiant surface Si of the radiant panel 1.
• the reflecting element 2 may have a reflecting surface S2 greater than the Radiant surface If the radiant panel 1 and in the case of a plurality of reflecting elements 2, the sum of the reflective surfaces S2 of the reflecting elements 2 located opposite the radiant panel 1 is greater than the radiant surface Si of the radiant panel 1.
• the center of the radiant panel 1 is located at a distance D from the center of the reflecting element 2. Depending on the layout in the passenger compartment, this distance D may vary. It should be noted that the radiant panel 1 is distant from the reflecting element 2, in the sense that the radiant panel 1 is not in contact with one or more of the reflective elements 2.
• the radiation 3 from the center of the radiant panel 1 is emitted in all directions, at least a portion of which is emitted to the reflecting element 2 and possibly another part is emitted to the area to be heat treated.
• the view factor also called the form factor, is then defined between the radiant panel 1 and the reflecting element 2 calculated as follows:
• the first and the second surfaces S1, S2 are decomposed into small areas d1 and d2 so that the small areas d1 and d2 are negligible in area compared to the first surface S1 and the second surface S2, respectively.
• the ratio S1 / dS1 between the first surface Si and the first small area dS1 is greater than one thousand. It is the same for the ratio S2 / dS2 between the second surface S2 and the second small surface dS2.
• An angle ⁇ is then defined between the normal to the first small area dS1 and the normal to the second small area dS2 and an angle ⁇ 2 between the normal to the second small area dS2 and the normal to the first small area dS1.
• the distance D defined above also represents the distance between the first small surface dS1 and the second small surface dS2.
• the view factor of the first surface Si towards the second surface S2 is denoted F and is expressed according to the following formula:
• the view factor F when the surface S2 of the reflecting element 2 is relatively close to the radiant panel 1 and the angles ⁇ and & 2 are less than 90 degrees, the view factor F will be non-zero.
• the positioning of the reflecting surface S2 with respect to the radiant surface Si of the radiant panel 1 is chosen to verify a view factor of greater than or equal to 5% ⁇
• the view factor is less than or equal to 50 %.
• An optimal view factor is between 20% and 50%.
• Such an arrangement of the reflective element 2 with respect to the radiant panel 1 makes it possible to distribute radiation sources, especially infrared, at a lower cost, which offers better coverage of the infrared radiation by increasing its homogeneity and avoiding hot spots.
• the presence of the reflective element 2 provides an ease of implantation greater than that of an additional radiant panel 1.
• a passenger compartment is defined as a part of the vehicle in which the users, such as the driver and the passengers, settle.
• FIG. 2 shows part of a passenger compartment 5, here of a motor vehicle, comprising a sun visor 6.
• the sun visor 6 comprises at least one ball 61 and a flap 62 movable around this ball 61.
• the flap 62 is movable between a closed position, where its inner face 63 is pressed against a horn 7 delimiting the passenger compartment 5, and an open position, where its outer face 64 is closer to a windshield. of the vehicle.
• the flap 62 defines on the roof 7 a zone 8 facing the flap 62, shown by dashed lines in the figures. Specifically, the zone 8 facing the flap 62 corresponds to a projection of the flap 62 on the roof 7 ⁇ Thus the zone 8 facing the flap 62 has characteristics, such as a shape, contours and an area, identical to those of part 62.
• the roof 7 integrates the radiant panel 1 of the heat treatment unit 10. More specifically, the radiant panel 1 is entirely located in the zone 8 facing the flap 62 as defined above. Thus, the radiant panel 1 comprises a radiant surface 15 less than or equal to the area of the zone 8 facing the flap 62. According to an alternative embodiment, the radiant surface 15 of the radiant panel 1 is greater than the zone 8 opposite. the flap 62 and is greater than the surface of the flap 62. Of course, it is possible to provide more than one radiant panel 1 on the roof 7 occupying the zone 8 facing the flap 62.
• the shutter 62 of the sun visor 6 here comprises a single reflecting element 2 of the heat treatment assembly 10, located opposite the radiant panel 1. More specifically, the reflecting element 2 is disposed on the inner face 63 of the shutter 62 Of course, it is possible to predict more than one reflective element 2 on the flap 62. Thus, in the closed position, the radiant panel 1 and the reflective element 2 are found at least partly face-to-face.
• the reflecting element 2 behaves in the visible like a mirror. In other words, the reflecting element 2 is reflective in the visible, ie for a wavelength between 400 nm and 800 nm. It should be noted that, according to this exemplary embodiment, the reflecting surface 25 of the reflecting element 2 is greater than the radiant surface 15 of the radiant panel 1.
• the radiation 3 emitted by the radiant panel 1 is reflected by the reflecting element 2 in reflected rays 4 directed towards an area to be thermally treated Z.
• the zone to be heat treated Z corresponds, here , at the top of a seat, so as to heat the face and upper body of a user installed on this seat.
• the radiant panel 1 when the radiant panel 1 is in operation, the user lowers the sun visor 6 to take advantage of the reflected rays 4 on the face and the upper body, these reflected rays 4 being partially adjustable according to the position of the sun visor 6
• the radiant panel 1 also directly participates in the heating of the area to be thermally treated Z.
• the positions of the radiant panel 1 and the reflective element or elements 2 can be reversed.
• the radiant panel 1 is integrated with the inner face 63 of the flap 62 and the reflective element or elements 2 are integrated in the horn 7 ⁇
• the assembly formed by the radiant panel 1, the reflective element 2, and possibly the sun visor 6 can be the subject of an available module to be attached to the flag 7 ⁇
• FIG. 3 illustrates another example of implantation in the passenger compartment 5 that can be substituted for the preceding example or complete it.
• This second embodiment shows the implementation of the heat treatment unit 10 in a post 9 of the vehicle, here an amount of a windshield 11 of a motor vehicle.
• the radiant panel 1 of the heat treatment unit 10 is integrated with the upright 9 and several reflecting elements 2 of the heat treatment unit 10 are arranged on the windows located at the edge of the upright 9 comprising the radiant panel 1, such as the windshield 11 or the side window 12.
• a single reflective element 2 could be provided on one of the windows 11, 12 located at the edge of the upright 9 ⁇
• the set of uprights 9 of the vehicle can be equipped with thermal assembly 10.
• Each reflective surface of the reflective element 2 is made on the panes, for example, by a low-emissivity reflective deposit over a width of 0.5 to 10 centimeters at the edge of the upright 9 ⁇ More precisely, the width from 0.5 to 10 centimeters is measured from the upright 9 and perpendicular thereto.
• the reflective surface forms, for example, a strip of a width of 2 cm extending from top to bottom of the windshield. By “bordering the amount 9 ", it is understood that the reflective surface is adjacent to the upright 9 ⁇
• a low-emissivity reflective deposit has the advantage of being transparent in the visible and reflecting in the infrared. Thus, the reflective element 2 is transparent and the users can see through.
• the radiation 3 emitted by the radiant panel 1 is partly reflected by the reflecting element 2 in reflected rays 4 directed towards an area to be heat treated Z.
• the zone to be heat treated Z corresponds to here, at the top of a seat, so as to heat the face and the upper body of a user installed on this seat. It should be noted that part of the radiation 3 emitted is directed directly to the zone to be heat treated Z.
• the radiant panel 1 when the radiant panel 1 is in operation, the user benefits from both the emitted radiation 3 and the reflected radiation 4 on the face and upper body.
• the radiant panel extends over the roof of the vehicle above a door of the vehicle, with reflective elements located on the window of said door and a width of 0.5 to 10 centimeters in border of the pavilion. More specifically, the radiant panel may extend parallel to the floor of the vehicle or perpendicularly.
• FIG. 4 illustrates another example of implantation in the passenger compartment 5, which can substitute or complete at least one of the preceding examples of implantation.
• This third embodiment shows the implementation of a heat unit 10 in a cellar with feet 13 of the vehicle, here automobile.
• the cabin comprises at least two cellars with feet 13, one of which is dedicated to the driver and the other is dedicated to the passenger.
• the cellar with feet 13 is formed of at least one bottom wall 140, for example located under the pedals 14 when they are present, and side walls 130 bordering the bottom wall 140.
• a second bottom wall 140 is shown and plays the role of footrest.
• the side walls 130 form a stop with at least one of the bottom walls 140.
• the cellar 13 has six walls with two walls. 140 bottom and four side walls 130 thus defining a heat treatment zone Z in which the user can extend his feet.
• the number of walls of the cellar with feet 13 may vary from one vehicle to another.
• the radiant panel 1 is integrated with one of the bottom walls 140, here that located behind the pedals 14, and three reflecting elements 2 are situated on three different lateral walls 130, facing each other. of the radiant panel 1.
• the radiant panel 1 is protected by the pedals 14 when they are present, and the reflective elements 2 are arranged on the underside of the dashboard, on a door foot trim and on a side wall of a center console or a central portion of a dashboard.
• the side wall 130 forming the floor of the vehicle is devoid of reflective element 2 or radiant panel 1 so as not to disturb the user.
• a single reflecting element 2 could be provided on one of the side walls 130 facing the radiant panel 1 located on one of the bottom walls 140.
• the radiant panel 1 could be located on a side wall 130 while a reflecting element 2 is, optionally, located on another side wall 130 and / or on the bottom wall 140. All of the foot cellars 13 of the vehicle can be equipped with this heat assembly 10.
• the radiation 3 emitted by the radiant panel 1 is partly reflected by the reflecting elements 2 in reflected rays 4 directed towards an area to be thermally treated Z.
• the area to be heat treated Z corresponds to here, the volume defined by the cellar with feet 13 and the bottom of a seat, so as to heat the feet and legs of a user installed on this seat.
• part of the radiation 3 emitted is directed directly to the zone to be heat treated Z.
• the surfaces incorporating the radiant panels 1 are insulated so as to avoid thermal losses to the outside of the vehicle.

Landscapes

• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
• Air-Conditioning For Vehicles (AREA)
• Surface Heating Bodies (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=59253731

Family Applications (1)

Country Status (4)

Family Cites Families (5)

• 2017
  • 2017-04-26 FR FR1753645A patent/FR3065672B1/fr active Active
• 2018
  • 2018-04-17 WO PCT/FR2018/050960 patent/WO2018197779A1/fr unknown
  • 2018-04-17 EP EP18720340.1A patent/EP3615361A1/de not_active Withdrawn
  • 2018-04-17 CN CN201890000765.7U patent/CN211844025U/zh active Active

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