Energy-saving stepless linear speed regulation lithium battery hair dryer

Abstract

The invention belongs to the technical field of hair driers, and particularly relates to an energy-saving stepless linear speed regulation lithium battery hair dryer which comprises a handle, an air duct, a fan assembly and a heating element, a heat recovery assembly, a thermal expansion element and a wiping assembly are arranged in the air duct, and the heat recovery assembly preheats cold air through a circulating pipe and a heat exchange fin plate to improve the heat energy utilization efficiency; the energy consumption is reduced, the thermal expansion element is driven in the heating process of the heat exchange fin plate, a user does not need to manually adjust the wiping assembly, the operation process is simplified, abrasion is reduced, the service life is prolonged, a cold air notch ensures synchronous output of hot air and cold air, the shell is prevented from being overheated, and the use safety is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of hair dryers, and in particular relates to an energy-saving stepless linear speed-regulating lithium-electric hair dryer. Background Art

[0002] The hair dryer is composed of a group of electric heating wires and a small high-speed fan. When powered on, the electric heating wires will generate heat. At this time, the wind sucked by the fan will pass through the electric heating wires, thus heating the air. However, the existing hair dryers have the following problems:

[0003] 1) When the traditional hair dryer is in operation, it directly heats the inhaled cold air and then blows out hot air. The heat generated inside the hair dryer is not reused, which causes the heating element to consume more energy to heat up, resulting in higher overall energy consumption, which is not conducive to energy saving and environmental protection;

[0004] 2) After long-term use, the fan blades and internal structure of the existing hair dryer are prone to dust accumulation, which not only affects the efficiency of the hair dryer, but also may shorten its service life, and needs to be disassembled for cleaning;

[0005] 3) The existing hair dryers have a relatively simple air duct design, with only one air duct for blowing out hot air. While blowing out hot air, there is a lack of sufficient cold air flow for temperature balance, which causes the hair dryer shell to deform due to overheating, posing a safety hazard. Summary of the invention

[0006] The present invention overcomes the shortcomings of the prior art and provides an energy-saving stepless linear speed-regulating lithium-electric hair dryer. The circulating pipe and the heat exchange fin plate are used to effectively preheat the cold air, significantly improve the thermal energy utilization rate, reduce energy consumption, and achieve environmental protection and energy saving. The heat exchange fin plate drives the thermal expansion element to be linked with the wiping component, and automatically adjusts the wiping position according to the temperature, which simplifies the operation process and extends the life of the component. At the same time, the cold air notch on the ring plate ensures that cold air is released while blowing out hot air, prevents the hair dryer from overheating, ensures user safety, and avoids deformation of the shell.

[0007] The technical solution adopted by the present invention is as follows: This solution provides an energy-saving stepless linear speed-adjustable lithium-electric hair dryer, comprising a handle, a wind tube, a fan assembly and a heating element; the wind tube is fixedly connected to the top of the handle, and the wind tube has an air outlet and an air inlet for blowing out air flow, and the heating element and the fan assembly are fixedly arranged in the inner cavity of the wind tube from front to back;

[0008] The air duct is provided with a heat recovery component, a heat expansion element and a wiping component, the heat expansion element is fixedly arranged on the inner wall of the air duct, and the wiping component is fixedly arranged on the driving end of the heat expansion element; the heat recovery component includes a ring plate, a closed airway and a heat exchange frame; the outer periphery of the ring plate is fixedly connected to the inner wall of the air duct, the closed airway is fixedly arranged on the rear wall of the ring plate, and the inner cavity of the air duct is divided into a hot air cavity and a cold air cavity front and back; the fan component is fixedly installed on the rear wall of the closed airway, the heating element is fixedly installed on the inner wall of the closed airway, and the heat exchange frame The frame is fixedly connected to the front wall of the ring plate, a cold air inlet pipe is fixedly arranged at the bottom end of the heat exchange frame, the cold air inlet pipe passes through the ring plate and is connected with the cold air cavity, a preheating air outlet pipe is fixedly arranged at the top end of the heat exchange frame, the preheating air outlet pipe passes through the ring plate and is connected with the closed airway inner cavity, a circulation pipe connecting the cold air inlet pipe and the preheating air outlet pipe is fixedly arranged in the heat exchange frame, a plurality of heat exchange fins are fixedly arranged in an array on the outer surface of the circulation pipe; the temperature sensing end of the thermal expansion element extends into the inner cavity of the air duct and contacts with the outer surface of the preheating fin, and the wiping assembly is arranged on the rear side of the fan blades of the fan assembly.

[0009] Furthermore, the thermal expansion element includes a temperature sensing tube, an airbag and a push plate; the temperature sensing tube is fixedly arranged on the outer wall of the wind tube, and the extension of the temperature sensing tube to the inner cavity of the wind tube contacts the outer surface of the heat exchange fin; the airbag is fixedly arranged on the rear wall of the closed airway, and the other end of the temperature sensing tube is connected to the inner cavity of the airbag; the push plate is slidably engaged with the inner wall of the airbag, a return spring is arranged between the rear wall of the push plate and the inner wall of the airbag, and a push rod extending to the outside of the airbag is fixedly arranged on the rear wall of the push plate, and the push rod is located above the fan assembly.

[0010] Furthermore, the wiping assembly includes a driven rod and a cleaning head; the driven rod is fixedly connected to the rear end of the push rod, and the cleaning head is arranged at the bottom end of the driven rod.

[0011] Furthermore, a diverter assembly is also provided on the inner wall of the wind duct, and the diverter assembly includes a diverter plate, a cover plate and a baffle; the diverter plate is fixedly provided on the wind duct and located at the air outlet, the cover plate is fixedly provided on the outer wall of the wind duct, and two of them are symmetrically provided, a rotating groove is provided on the inner wall of the cover plate, a gas pipeline connected to the rotating groove is passed through the cover plate, and the gas pipeline is connected to the driving rod in an arc-shaped sliding connection, a pressure dividing tube is fixedly provided on the outer wall of the wind duct, and the two ends of the pressure dividing tube are respectively connected to the temperature sensing tube and the gas pipeline, and the baffle is rotatably connected to the inner wall of the wind duct through a rotating shaft, the baffle is provided on the rear side of the diverter plate, and the two ends of the rotating shaft extend through the wind duct wall into the rotating groove and a pressure plate is fixedly provided on the outer wall, and a reset torsion spring is fixedly provided on the inner wall of the rotating groove, and the other end of the reset torsion spring contacts the pressure plate for resetting the baffle after cooling.

[0012] As a further preferred embodiment of the present invention, a cold air slot is provided through the outer periphery of the ring plate, and a plurality of the cold air slots are distributed around the circumference for outputting a cold air flow to avoid overheating of the air duct housing.

[0013] The beneficial effects achieved by the present invention using the above structure are as follows:

[0014] (1) By using the heat exchange fins and the circulation tube, during the operation of the hair dryer, the heat of the high-temperature airflow is transferred to the cold air in the circulation tube through the heat exchange fins, thereby preheating the cold air, effectively utilizing the heat inside the hair dryer, reducing the energy consumption of the heating element, and improving the utilization efficiency of thermal energy, thereby achieving the purpose of energy saving and environmental protection. At the same time, the temperature rise process of the heat exchange fins is used to drive the thermal expansion element, and the user does not need to manually adjust the wiping component, which simplifies the operation process;

[0015] (2) The displacement of the wiping component is driven by the pressure of the temperature-sensitive agent, which avoids the continuous contact between the wiping component and the fan blades during normal use, reduces the wear time of the wiping component, prolongs the service life, and avoids the noise generated by the contact between the wiping component and the fan blades, thereby improving the user experience;

[0016] (3) During the heating process of the heat exchange fin plate, the cleaning head first cleans the fan blades, and the dust is discharged from the lower air outlet along with the air flow. When the cleaning head is completely away from the fan blades, the upper air outlet is opened and the lower air outlet is closed, thus realizing the separation of dust removal and drying, providing a visual effect, reducing the air outlet area, and enhancing the drying effect;

[0017] (4) The cold air slot allows the cold air to continuously overflow while the hot air is blown out, entraining the internal hot air to be ejected synchronously, thereby effectively avoiding the risk of overheating of the front side of the hair dryer and scalding the user and the risk of deformation of the shell, thereby improving the safety of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of an energy-saving stepless linear speed-regulating lithium electric hair dryer proposed by the present invention. Figure 1 ;

[0019] Figure 2 This is a schematic diagram of the structure of an energy-saving stepless linear speed-regulating lithium electric hair dryer proposed by the present invention. Figure 2 ;

[0020] Figure 3 A schematic diagram of the internal structure of an energy-saving stepless linear speed-regulating lithium-ion hair dryer proposed by the present invention;

[0021] Figure 4 A schematic diagram of the internal structure of an energy-saving, stepless linear speed-regulating lithium-ion hair dryer proposed by the present invention;

[0022] Figure 5For the present invention Figure 4 A partial enlarged view of the middle part;

[0023] Figure 6 For the present invention Figure 4 A partial enlarged view of part B in the middle;

[0024] Figure 7 This is a schematic diagram of the structure of the ring plate and the heat exchange frame proposed by the present invention;

[0025] Figure 8 A schematic diagram of the three-dimensional structure of the ring plate, the closed air passage and the heat exchange frame proposed in the present invention;

[0026] Fig. 9 A schematic diagram of the internal structure of the heat exchange frame proposed by the present invention;

[0027] Fig.10 This is a schematic diagram of the diversion component result proposed by the present invention;

[0028] Fig.11 This is a schematic diagram of the internal structure of the cover plate proposed by the present invention;

[0029] Fig.12 This is a schematic diagram of the pressure agent pipeline structure proposed by the present invention.

[0030] Among them, 1. handle, 2. air cylinder, 21. air outlet, 22. air flow inlet, 3. fan assembly, 4. heating element, 5. heat recovery assembly, 51. ring plate, 511. cold air slot, 52. closed airway, 53. heat exchange frame, 531. cold air inlet pipe, 532. preheating air outlet pipe, 533. circulation pipe, 534. heat exchange fin plate, 6. thermal expansion element, 61. temperature sensing tube, 62. air bag, 63. push plate, 64. reset spring, 65. push rod, 7. wiping assembly, 71. driven rod, 72. cleaning head, 8. diverter assembly, 81. diverter plate, 82. cover plate, 821. rotating groove, 822. gas pipeline, 823. driving rod, 83. baffle, 831. rotating shaft, 832. pressure plate, 833. reset torsion spring, 84. pressure divider.

[0031] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0033] Example 1: Please refer to Figure 1-Figure 12 The present embodiment provides an energy-saving stepless linear speed-regulating lithium-electric hair dryer, comprising a handle 1, a wind tube 2, a fan assembly 3 and a heating element 4; the wind tube 2 is fixedly connected to the top of the handle 1, and the wind tube 2 has an air outlet 21 and an air inlet 22 for blowing out air flow, and the heating element 4 and the fan assembly 3 are fixedly arranged in the inner cavity of the wind tube 2 from front to back;

[0034] The air duct 2 is provided with a heat recovery component 5, a heat expansion element 6 and a wiping component 7, the heat expansion element 6 is fixedly arranged on the inner wall of the air duct 2, and the wiping component 7 is fixedly arranged on the driving end of the heat expansion element 6; the heat recovery component 5 includes a ring plate 51, a closed air duct 52 and a heat exchange frame 53; the outer periphery of the ring plate 51 is fixedly connected to the inner wall of the air duct 2, the closed air duct 52 is fixedly arranged on the rear wall of the ring plate 51, and the inner cavity of the air duct 2 is divided into a hot air cavity and a cold air cavity front and back, the fan component 3 is fixedly installed on the rear wall of the closed air duct 52, the fan component 3 includes a stepless linear speed regulation motor electrically connected to the lithium battery in the inner cavity of the handle 1 and a fan blade transmission-connected to the stepless linear speed regulation motor, the heating element 4 is fixedly installed on the inner cavity of the closed air duct 52, the heating element 4 includes a M-shaped mounting plate and an electric heating wire, the M-shaped mounting plate and The inner wall of the closed airway 52 is fixedly connected, the electric heating wire is fixedly arranged on the M-shaped mounting plate, the electric heating wire is electrically connected to the lithium battery inside the handle 1, the heat exchange frame 53 is fixedly connected to the front wall of the ring plate 51, a cold air inlet pipe 531 is fixedly arranged at the bottom end of the heat exchange frame 53, the cold air inlet pipe 531 passes through the ring plate 51 and is connected to the cold air cavity, a preheating air outlet pipe 532 is fixedly arranged at the top end of the heat exchange frame 53, the preheating air outlet pipe 532 passes through the ring plate 51 and is connected to the inner cavity of the closed airway 52, a circulation pipe 533 connecting the cold air inlet pipe 531 and the preheating air outlet pipe 532 is fixedly arranged in the heat exchange frame 53, and 50 heat exchange fins 534 are fixedly arranged on the outer surface of the circulation pipe 533; the temperature sensing end of the thermal expansion element 6 extends into the inner cavity of the air cylinder 2 and contacts the outer surface of the preheating fin, and the wiping component 7 is arranged on the rear side of the fan blade;

[0035] In this embodiment, after the fan assembly 3 is running, cold air from the outside is pumped into the air duct 2 from the air inlet 22, and the heating element 4 starts to heat the surrounding air flow. When the fan blades of the fan assembly 3 rotate, the wiping assembly 7 completes the dust cleaning of the fan blades. After the air flow enters the cold air cavity, it passes through the cold air inlet pipe 531, the circulation pipe 533, and the preheating air outlet pipe 532 and enters the closed air duct 52. After being heated by the heating element 4, it passes through the heat exchange fin plate 534 and is blown out from the air outlet 21. The heat exchange fin plate 534 conducts the heat of the high-temperature air flow to the The cold air in the circulation pipe 533 is preheated, and the heat inside the hair dryer is used to preheat the inhaled air, thereby reducing the energy consumption of the heating element 4, improving the utilization efficiency of thermal energy, and reducing energy waste; the temperature-sensing end of the thermal expansion element 6 deforms when it senses the heating of the heat exchange fin 534, and pushes the wiping assembly 7 to move backward, so that the wiping assembly 7 is away from the fan blades, avoiding contact with the fan blades when the hair dryer is preheated and used normally, reducing the wear time of the wiping assembly 7, and increasing the service life of the wiping mechanism, while avoiding noise.

[0036] Example 2: This example is based on Example 1. Please refer to Figure 1-Figure 9 , the difference is that, in this embodiment, the thermal expansion element 6 includes a temperature sensing tube 61, an air bag 62 and a push plate 63; the temperature sensing tube 61 is fixedly arranged on the outer wall of the wind tube 2, the temperature sensing end of the temperature sensing tube 61 extends to the inner cavity of the wind tube 2 and contacts the outer surface of the heat exchange fin 534, the air bag 62 is fixedly arranged on the rear wall of the closed airway 52, the other end of the temperature sensing tube 61 is communicated with the inner cavity of the air bag 62, the push plate 63 is slidably engaged with the inner wall of the air bag 62, a return spring 64 is arranged between the rear wall of the push plate 63 and the inner wall of the air bag 62, a push rod 65 extending to the outside of the air bag 62 is fixedly arranged on the rear wall of the push plate 63, and the push rod 65 is located above the fan assembly 3;

[0037] The wiping assembly 7 includes a driven rod 71 and a cleaning head 72; the driven rod 71 is fixedly connected to the rear end of the push rod 65, and the cleaning head 72 is arranged at the bottom end of the driven rod 71;

[0038] The cavity of the temperature sensing tube 61 is filled with a temperature sensing agent. When the heat exchange fin 534 begins to heat up, the pressure of the temperature sensing agent in the temperature sensing tube 61 increases. Under the action of pressure, the push plate 63 moves backward, and the push rod 65 drives the driven rod 71 and the cleaning head 72 away from the fan blades to avoid normal use of the hair dryer after preheating. When the hair dryer is used up, the heat exchange fin 534 and the temperature sensing agent cool down, the pressure of the temperature sensing agent drops, and the reset spring 64 drives the push plate 63 to return.

[0039] Example 3: This example is based on Example 2, please refer to Figure 1-Figure 12, the difference is that, in this embodiment, a flow dividing assembly 8 is further provided on the inner wall of the wind tube 2, and the flow dividing assembly 8 includes a flow dividing plate 81, a cover plate 82 and a baffle 83; the flow dividing plate 81 is fixedly provided on the wind tube 2 and is located at the air outlet 21, the cover plate 82 is fixedly provided on the outer wall of the wind tube 2, and two of them are symmetrically provided, a rotation groove 821 is provided on the inner wall of the cover plate 82, a gas pipeline 822 connected to the rotation groove 821 is penetrated in the cover plate 82, and an arc-shaped sliding connection is provided in the gas pipeline 822 Driving rod 823, a pressure dividing tube 84 is fixedly arranged on the outer wall of the wind tube 2, and the two ends of the pressure dividing tube 84 are respectively connected to the temperature sensing tube 61 and the gas pipeline 821, the baffle 83 is rotatably connected to the inner wall of the wind tube 2 through the rotating shaft 831, the baffle 83 is arranged on the rear side of the diverter plate 81, the two ends of the rotating shaft 831 pass through the wall of the wind tube 2 and extend into the rotating groove 821 and a pressure plate 832 is fixedly arranged on the outer wall, and a return torsion spring 833 is fixedly arranged on the inner wall of the rotating groove 821, and the other end of the return torsion spring 833 contacts the pressure plate 832;

[0040] During the heating process of the heat exchange fin 534, the fan blades are cleaned before the cleaning head 72 is completely away from the fan blades, and the dust is discharged from the separated lower air outlet with the air flow. When the temperature sensing agent releases the maximum pressure, the cleaning head 72 is completely pushed away from the fan blades under the action of pressure. At the same time, the pressure divider tube 84 applies pressure to the driving rod 823 in the gas pipeline 822, and the driving rod 823 slides in the gas pipeline 822 to apply pressure to the pressure plate 832, and the pressure plate 832 drives the rotating shaft 831 and the baffle 83 to rotate. After rotating 110 degrees, the upper air outlet is completely opened and the lower air outlet 21 is completely closed, realizing the separation of dust removal and drying, providing a visual effect, reducing the area of ​​the air outlet 21, and enhancing the drying effect. After the heat exchange fin 534 is cooled, the pressure is reduced, and the elastic force of the reset torsion spring 833 applies pressure to the pressure plate 832, driving the baffle 83 and the driving rod 823 to reset.

[0041] Embodiment 4: This embodiment is based on the above embodiment, please refer to Figure 1-8 The difference is that, in this embodiment, 20 cold air slots 511 distributed in a circle are arranged on the outer periphery of the ring plate 51. While blowing hot air outward, cold air flows continuously from the cold air slots 511, and the cold air flow carries with it the internal hot air flow and is ejected synchronously. The cold air flow on the outside can well protect the front side of the wind tube 2, and effectively avoid the probability of overheating of the front side of the wind tube 2 to scald the user and deformation of the shell.

[0042] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. An energy-saving stepless linear speed-regulating lithium-ion hair dryer, comprising a handle (1), a wind tube (2), a fan assembly (3) and a heating element (4); the wind tube (2) is fixedly connected to the top of the handle (1), the wind tube (2) has an air outlet (21) and an air inlet (22) for blowing out air, the heating element (4) and the fan assembly (3) are fixedly arranged in the inner cavity of the wind tube (2) from front to back, and is characterized in that: The air duct (2) is provided with a heat recovery component (5), a heat expansion element (6) and a wiping component (7); the heat expansion element (6) is fixedly arranged on the inner wall of the air duct (2), and the wiping component (7) is fixedly arranged on the driving end of the heat expansion element (6); the heat recovery component (5) comprises a ring plate (51), a closed air duct (52) and a heat exchange frame (53); the outer periphery of the ring plate (51) is fixedly connected to the inner wall of the air duct (2), the closed air duct (52) is fixedly arranged on the rear wall of the ring plate (51), the fan component (3) is fixedly installed on the rear wall of the closed air duct (52), the heating element (4) is fixedly installed on the inner wall of the closed air duct (52), the heat exchange frame (53) is fixedly connected to the front wall of the ring plate (51), and the heat exchange frame (53) is fixedly installed on the rear wall of the closed air duct (52). A cold air inlet pipe (531) is fixedly arranged at the bottom end of the frame (53), and the cold air inlet pipe (531) passes through the ring plate (51) and is connected to the air flow inlet (22). A preheating air outlet pipe (532) is fixedly arranged at the top end of the heat exchange frame (53), and the preheating air outlet pipe (532) passes through the ring plate (51) and is connected to the inner cavity of the closed air duct (52). A circulation pipe (533) connecting the cold air inlet pipe (531) and the preheating air outlet pipe (532) is fixedly arranged in the heat exchange frame (53), and a plurality of heat exchange fins (534) are fixedly arranged in an array on the outer surface of the circulation pipe (533); the temperature sensing end of the thermal expansion element (6) extends into the inner cavity of the air cylinder (2) and contacts the outer surface of the heat exchange fin (534); and the wiping assembly (7) is arranged on the rear side of the fan blade of the fan assembly (3).

2. The energy-saving stepless linear speed-regulating lithium electric hair dryer according to claim 1, characterized in that: The thermal expansion element (6) includes a temperature sensing tube (61), an air bag (62) and a push plate (63); the temperature sensing tube (61) is fixedly arranged on the outer wall of the wind tube (2), the temperature sensing end of the temperature sensing tube (61) extends to the inner cavity of the wind tube (2) and contacts the outer surface of the heat exchange fin (534), the air bag (62) is fixedly arranged on the rear wall of the closed airway (52), the other end of the temperature sensing tube (61) is connected to the inner cavity of the air bag (62), the push plate (63) is slidably engaged with the inner wall of the air bag (62), a return spring (64) is arranged between the rear wall of the push plate (63) and the inner wall of the air bag (62), and a push rod (65) extending to the outside of the air bag (62) is fixedly arranged on the rear wall of the push plate (63), and the push rod (65) is located above the fan assembly (3).

3. According to the energy-saving stepless linear speed-regulating lithium-electric hair dryer described in claim 2, the wiping assembly (7) comprises a driven rod (71) and a cleaning head (72); the driven rod (71) is fixedly connected to the rear end of the push rod (65).

4. The energy-saving stepless linear speed-regulating lithium-ion hair dryer according to claim 3, characterized in that: A flow dividing assembly (8) is further provided on the inner wall of the wind tube (2), and the flow dividing assembly (8) comprises a flow dividing plate (81), a cover plate (82) and a baffle plate (83); the flow dividing plate (81) is fixedly provided on the wind tube (2) and is located at the air outlet (21); the cover plate (82) is fixedly provided on the outer wall of the wind tube (2), and two of them are symmetrically provided; a rotation groove (821) is provided on the inner wall of the cover plate (82); a gas pipeline (822) communicating with the rotation groove (821) is penetrated in the cover plate (82); a driving rod (823) is slidably connected in an arc shape in the gas pipeline (822); A pressure dividing tube (84) is fixedly arranged on the outer wall of the wind tube (2), and the two ends of the pressure dividing tube (84) are respectively connected to the temperature sensing tube (61) and the gas pipeline (821). The baffle plate (83) is rotatably connected to the inner wall of the wind tube (2) via a rotating shaft (831). The baffle plate (83) is arranged on the rear side of the diverter plate (81). The two ends of the rotating shaft (831) pass through the wall of the wind tube (2) and extend into the rotating groove (821). A pressure plate (832) is fixedly arranged on the outer wall. A return torsion spring (833) is fixedly arranged on the inner wall of the rotating groove (821), and the other end of the return torsion spring (833) contacts the pressure plate (832).

5. The energy-saving stepless linear speed-regulating lithium electric hair dryer according to claim 4, characterized in that: A cooling air slot (511) is provided through the outer circumference of the ring plate (51), and a plurality of cooling air slots (511) are distributed around the circumference.

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