46results about How to "Avoid canceling each other out" patented technology

This invention discloses an air-source thermal pump device used in summer and winter including a compressor, an outdoor heat-exchanger, a user heat-exchanger, a throttle unit and a four-way valve. This invention adds an outer door second heat exchanger, a throttle unit and a four-way valve, which absorbs heat from outdoor air when defrosting in winter to realize defrosting to hot gas and avoid counteract of cold and hot volume and reduce energy cost in the process and increase performance of hot pump device, besides, this invention can realize super-cooling of cooling agent.

The invention discloses a planar motor adopting groove-type coil, which is mainly used in the field of mechanical production devices and robots. The planer motor comprises a rotor and a stator, wherein, the rotor is composed of four one-dimensional coil arrays, and the arraying directions of the adjacent coil arrays are in 90 degrees; each one-dimensional coil array is formed by stagger arrangement of a rectangular coil without iron cores and a rectangular groove-type coil without iron cores, and the two short edges of the rectangular groove-type coil without iron cores form a groove type; the long edge of an adjacent groove-type coil is inserted between two long edges of each rectangular coil, or one long edge of each of a left adjacent groove-type coil and a right adjacent groove-type coil is inserted between two long edges of each rectangular coil; the long edges of two kinds of coils are both arranged on one plane; and the stator is composed of a permanent magnet array. Compared with a coil array composed of rectangular coils without iron cores, the coil array can generate bigger thrust in the periodic magnetic field of the permanent magnet array so as to improve the thrust and the accelerated speed of the planer motor.

The invention provides a noise reduction structure of a vertical air purifier. The noise reduction structure of the vertical air purifier mainly comprises an outer shell, an air passage, an air guide plate, a motor, a motor support, a wind wheel and an air inlet flange disk. The air guide plate, the motor, the wind wheel and the air inlet flange disk are sequentially arranged inside the outer shell from top to bottom. The bottom surface of the wind wheel is arranged in a flange hole. The wall of the flange hole of the air inlet flange disk is a curved surface protruding towards the wind wheel. By means of the noise reduction structure of the vertical air purifier, air in the air passage is prevented from being interfered or counteracted, and collision between the air and the shell is reduced, so that the noise generated when the air purifier operates is lowered, and meanwhile the purification efficiency is improved.

The invention discloses a stirring barrel of a canned food mixer, which is used for solving the problem that food is easily damaged by the impact effect of a stirring blade of the mixer to food. The stirring barrel comprises a cylindrical inner case and an outer case, a cavity of the stirring barrel is formed by cooperating and connecting the inner case and the outer case; a nozzle is arranged in the cavity, a through hole is opened on the inner case, the through hole is arranged on the inner case along a spiral line, a nozzle orifice of the nozzle is mutually adapted to the through hole, and the nozzle is communicated to the compressed air outside the stirring barrel through a pipeline. The stirring barrel is capable of reducing the impact of stirring blades to the food, minimizing the damage to food, and increasing the stirring efficiency.

The invention relates to the terahertz signal detection field, and especially to a room temperature terahertz detector based on a gallium nitride high electron mobility transistor and a preparation method thereof. The detector includes a gallium nitride high electron mobility transistor provided with a source electrode, a gate electrode, and a drain electrode, and also includes a nanometer antenna. The nanometer antenna is located between the source electrode and the drain electrode of the gallium nitride high electron mobility transistor and at one side of the gate electrode. The nanometer antenna is arranged at a distance from the gate electrode. One side of the gate electrode, adjacent to the nanometer antenna, is provided with a protrusion array having the corresponding shape and interval as the nanometer antenna. The protrusion array and the nanometer antenna form a tip-to-tip structure for increasing a terahertz electric field. The room temperature terahertz detector based on the gallium nitride high electron mobility transistor employs a unique nanometer antenna structure and combines a special gate electrode structure, effectively improves the coupling efficiency of the detector to a terahertz electromagnetic wave, and realizes the detection of the room temperature of the terahertz electromagnetic wave, and the high sensitive and low equivalent noise power.

The invention relates to an LED (Light-Emitting Diode) lamp technology, in particular to an LED lamp bulb with high lighting effect, comprising a lamp head, a lamp shade and a power supply, wherein a radiating metal shell is clamped between the lamp head and the lamp shade; the top of the radiating metal shell is positioned in the lamp shade; a radiating substrate is clamped and fixed at the top of the radiating metal shell; LED light-emitting columns are plugged in and fixed on the radiating substrate and are uniformly arranged at intervals; and the LED light-emitting columns are arranged ina rotating way relative to the center of the radiating substrate. As the LED light-emitting columns are arranged in a rotating way relative to the center of the radiating substrate, counteracting of large parts of light rays among the LED light-emitting columns can be avoided, and the light rays emitted by the LED light-emitting columns are fully utilized, so that the brightness of the whole LED lamp bulb is improved and the LED lamp bulb with high lighting efficiency is realized.

The invention discloses an LED bulb with an efficient heat dissipation function. The LED bulb comprises a light source, a transparent lamp cover, a lamp body and a power supply. A light source is fixedly arranged on the upper portion of the lamp body, is electrically connected with the power supply arranged in the lamp body and is a columnar light-emitting column, and a plurality of SMD LED lamp beads are distributed on the radial surface of the light source. The edge of the upper portion of the lamp body is covered by the transparent lamp cover. The bulb further comprises a reflective cover, and the reflective cover comprises a barrel body and a bottom plate. The barrel body is arranged on the light-emitting column in a sleeved mode. Light-permeable holes are formed in positions, corresponding to the LED lamp beads, of the barrel body. The top end of the barrel body protrudes out of the transparent lamp cover and is provided with a ventilating hole. A horn-shaped bottom plate for covering the lamp body stretches outwards from the edge of the bottom end of the barrel body in the radial direction. A protrusion part is arranged on the bottom plate and corresponds to the light-permeable holes. A heat dissipation channel penetrating through the LED bulb is further arranged in the LED bulb. The LED bulb is high in brightness and good in heat dissipation effect, and light emitted by the LED bulb is soft and uniform.

The invention discloses a food stirring device.The food stirring device comprises a base, a stirring bucket, a stirring device body, a protection body, a barrel-shaped inner shell and a barrel-shaped outer shell.The stirring bucket is installed on the base, the protection body is installed on the right side of the base, and a sealing cover is arranged at the top of the stirring bucket; the inner shell and the outer shell are matched and connected to form a cavity of the stirring bucket; a spraying head is arranged in the cavity, a through hole is formed in the inner shell along a spiral line, nozzles of the spraying head and the through hole are adapted, and the spraying head is communicated with compressed air outside the stirring bucket through a pipe; the stirring device body comprises a stirring shaft, a stirring shaft sleeve, stirring shaft supporting rods and cutter fixing discs; the stirring shaft sleeve is rotationally connected to the upper end of the stirring shaft; one ends of the stirring shaft supporting rods are rotationally connected with the edge of the stirring shaft sleeve, and the other ends of the stirring shaft supporting rods are connected into sliding grooves in a sliding mode; the stirring shaft sleeve is rotationally connected with the upper end of the stirring shaft.

The invention provides a piezoelectric type micro acceleration sensor. The sensor comprises a sensitive chip and an upper glass plate and a lower glass plate. The sensitive chip adopts an annular structure which is symmetrical in structure. The sensitive chip comprises eight upper electrodes, eight lower electrodes, eight piezoelectric layers, a supporting membrane and a mass block in total. The eight lower electrodes are arranged on the supporting membrane. The eight piezoelectric layers are arranged on the lower electrodes. The eight upper electrodes are arranged on the piezoelectric layers. The mass block is suspended below the lower electrodes and fixedly connected with the supporting membrane. The mass block is suspended below the supporting membrane so that a movable part of the sensitive chip is formed. Circular rings formed by the electrodes and the piezoelectric layers respectively are concentric with the mass block. The sensitive chip and the upper glass plate and the lower glass plate are respectively connected via bonding. An inherent frequency of the piezoelectric type micro acceleration sensor is greater than 14.8KHz, and sensitivity is 0.62pC / g.

The invention discloses a power generation device for a vaneless wind turbine. The power generation device comprises a support rod, a base, a plurality of movable magnet discs, a plurality of fixed magnet disc, a movable coil, a fixed coil, a coil fixing frame I and a coil fixing frame II; a wind tower is mounted at the upper end of the support rod; the middle of the support rod is fixed at the upper part of the base through a spherical hinged seat; the base is hollow; the bottom of the base is fixed on the ground through a ground support; the lower end of the support rod stretches into the base; the movable magnet discs and the coil fixing frame I are fixedly arranged at the lower end of the support rod; the movable coil is wound on the coil fixing frame I; the fixed magnet discs and thecoil fixing frame II are fixedly arranged on the inner wall of the base; and the fixed coil is wound on the coil fixing frame II. The working condition of the power generation device can be adjusted;and the power generation device is simple in structure, fewer in components, and free of a transmission mechanism, can increase the utilization ratio of an electric generator and also can reduce the manufacturing, mounting and maintaining cost of the wind turbine.

The invention provides an electric driver for an air vehicle and a ship. The electric driver comprises a motor output shaft; the electric driver further comprises a first rotor system, a second rotor system and a synchronous output system; the first rotor system comprises a first rotor and a first stator which are coaxially arranged; the second rotor system comprises a second rotor and a second stator which are coaxially arranged, and the first rotor and the second rotor are coaxially arranged; the synchronous output system comprises a sun gear, planet gears, planet carriers and a gear ring; the planet gears surround the sun gear and are meshed with the sun gear; the gear ring is arranged outside the planet gears in a sleeving mode and meshed with the planet gears; the planet gears are supported on the planet carriers; the sun gear, the gear ring and the planet gears have a two-input one-output relation, that is to say, any two of the sun gear, the gear ring and the planet gears are driven by the first rotor and the second rotor to rotate respectively, and the rest one is fixedly connected with the motor output shaft. According to the electric driver, by arranging the synchronous output system, rotating of the first rotor and rotating of the second rotor are synchronously output to the motor output shaft, mutual counteracting of output torque of the first rotor and the second rotor is avoided, the motor efficiency is significantly improved, and not only is the power higher, but also energy is effectively saved. The invention further provides the air vehicle and the ship applying the electric driver.

The invention aims at providing an asymmetric double axle helicopter with small volume, compact structure and good performance and a flying method thereof. The asymmetric double axle helicopter comprises a helicopter body, a first power output shaft and a second power output shaft; the first power output shaft and the second power output shaft are both mounted in the helicopter body in a matched manner; the first power output shaft is arranged in the vertical direction of the helicopter body; the second power output shaft is arranged in a direction having a certain angle with the vertical lineof the helicopter body; the first power output shaft and the second power output shaft synchronously rotate; the asymmetric double axle helicopter further comprises two groups of rotors; the two groups of rotors are correspondingly mounted on the first power output shaft and the second power output shaft in a matched manner; the two groups of rotors do not collide with the first power output shaft and the second power output shaft in the rotating process; and operating levers are connected to blades of the rotors. The asymmetric double axle helicopter and the flying method thereof are appliedto the technical field of double axle helicopters.

The disclosed DC motor includes following parts: chassis, stator installed inside chassis, rotor core setup at shaft, armature winding on core for generating magnetic beam, and converter installed on the shaft for supplying power to armature windings. There are at least more than two pairs of magnetic poles on the stator. Number of winding on armature is twice of number of stator pole. Multiple windings on armature are separated into two groups of winding. In each group, adjacent windings generate same magnetic pole so as to increase density of magnetic flux, or avoid cancel of magnetic flux. Thus, work efficiency of DC motor is increased. Cascaded windings in each group are connected to converter installed on shaft.

The invention relates to an abnormal data screening method. The abnormal data screening method comprises the following steps: S1, collecting target data, wherein the target data comprises target historical data and target real-time data; S2, preprocessing the target data, and performing feature extraction; S3, training a parallel integrated anomaly detection model based on local features by taking the target historical data as a training set; and S4, deducing the target real-time data by using the trained parallel integrated anomaly detection model, and screening out the abnormal data of the target. According to the method, the relationship between local data is utilized, the basic model is screened, mutual counteraction between the basic classifier with a good effect and the basic classifier with a poor effect is avoided, and the local data features are better utilized.

The invention provides a miniaturized Vivaldi antenna based on a bent branch loading technology, which comprises a dielectric substrate and metal patches covering the upper surface and the lower surface of the dielectric substrate respectively, wherein the metal patch on the lower surface is a microstrip feeder; the metal patch on the upper surface comprises a ground plate; conical sheets and bent branches are horizontally symmetrically arranged above the ground plate; the conical sheet is formed by an inner slot line, an outer slot line and a right angle in a surrounding mode; the center axis of the ground plate is provided with a section of vertical slot line; the inner slot line of the conical sheet is connected above the slot line; a round slot is connected below the vertical slot line; the inner slot line and the outer slot line are exponential type curves; and each bent branch is formed by a vertical branch and a transverse branch in a mutual vertical splicing mode. the whole space structure of the antenna is compact, side feed is adopted, and the space occupied by the antenna in the vertical direction is reduced; through increasing one pair of bent branches, extra resonant frequency points are added in a low frequency band, the bandwidth of the antenna is widened, understanding is easy, and the miniaturization scheme of the antenna has strong portability.

The invention discloses an establishing method and application of an asthma-like chronic obstructive pulmonary overlap airway inflammation mouse model. The model is constructed by any one of the following modes: S1, smoking and aspergillus protease induced ACO-like model: enabling mice to inhale smoke of cigarettes every day from the 0th day; after smoking treatment is completed for 3-7 days, enabling an aspergillus protease solution to be dropwise added into the noses to sensitize the mice, wherein an ACO-like model is constructed; S2, preparing an ACO-like model induced by nano carbon blackparticles and aspergillus protease: intranasally dripping the nano carbon black particles into the anesthetized mice from the 0th day, wherein after the nano carbon black particles are treated for 2 weeks, an aspergillus protease solution is dropwise added into the noses to sensitize mice, and an ACO-like model is constructed. The constructed ACO-like model can simulate the characteristic that asthma chronic obstructive pulmonary overlap occurs in the later stage of diseases of patients with chronic obstructive pulmonary disease clinically, and an experimental animal model is provided for ACOmorbidity mechanism and drug treatment research.

The invention discloses a veterinary medicine used for treating poultry diarrhea and a preparation technology thereof. The veterinary medicine used for treating poultry diarrhea comprises an inflammation diminishing layer, a sustained-release layer and a diarrhea alleviating layer which are sequentially adhered from the outside to the inside; the inflammation diminishing layer is prepared from thefollowing raw materials in parts by weight: 10-15 parts of rhizoma coptidis, 20-35 parts of roots of Chinese pulsatilla, 9-17 parts of kudzuvine roots, 10-20 parts of honeysuckle flowers, 10-15 partsof cogon grass rhizome, 3-15 parts of fructus forsythiae, 8-19 parts of baical skullcap roots, and 13-17 parts of herba houttuyniae; the sustained-release layer is prepared from the following raw materials in parts by weight: 80-90 parts of corn flour, 50-60 parts of soybean flour, and 5-10 parts of an adhesive; and the diarrhea alleviating layer is prepared from the following raw materials in parts by weight: 3-5 parts of rhizoma coptidis, 5-15 parts of white atractylodes rhizome, 17-25 parts of baked ginger, 10-15 parts of Chinese yams, 3-6 parts of radix astragali, 1-3 parts of Chinese angelica roots, 5-7 parts of white peony, 5-13 parts of corydalis tubers (yanhusuo), 5-12 parts of radix aucklandiae, 5-8 parts of radix sanguisorbae, 5-9 parts of halloysite, 9-23 parts of cutch, and 10-20 parts of liquorice roots. The veterinary medicine used for treating poultry diarrhea is capable of performing anti-inflammatory treatment on poultry before realizing of the anti-diarrhea effect; and thus, relatively good diarrhea alleviating effects can be achieved on the poultry.

The invention discloses an LED bulb with a transparent lampshade. The LED bulb with the transparent lampshade comprises a light source, the transparent lampshade, a lamp body and a power source, wherein the light source is fixedly arranged at the top of the lamp body and is electrically connected with the power source inside the lamp body, the transparent lampshade and the lamp body seal the light source, the light source is a cylindrical light-emitting pillar, and a plurality of surface-mounted LED beads are distributed on the radial surface of the light-emitting pillar. The LED bulb further comprises a light reflection cover, wherein the light reflection cover comprises a barrel body and a base plate, the barrel body is arranged outside the light-emitting pillar in a sleeved mode, light-permeating holes are formed in the positions, corresponding to the LED beads, of the barrel body, the top end of the barrel body is sealed, the radial edge at the bottom end extends out of the horn-shaped base plate of the covered lamp body, a protruding part is arranged on the base plate and corresponds to the light-permeating holes, and the lamp body further comprises a connecting part used for separating the heat generated by the light source and the heat generated by the power source. The LED bulb is high in brightness, soft and uniform in light, long in service life and low in manufacturing cost.

The invention discloses a heat pump device which can be used both in summer and winter. The heat pump device comprises a compressor, a heat source side heat exchanger, a user side heat interchanger, a throttling mechanism and a four-way valve; and the heat pump device also comprises a second heat interchanger, a second throttling mechanism and a second four-way valve. The four-way valve is provided with four nodes, a four-way valve node is connected with the output end of the compressor through a pipeline, the four-way valve node is connected with the input end of the compressor through the pipeline, the four-way valve node is connected with one end of the user side heat interchanger through the pipeline, the four-way valve node is connected to the node of the four-way valve through the pipeline, the other node of the four-way valve is connected with the other ends of the user side heat interchanger in sequence through the pipeline and the throttling mechanism, the four-way valve node is connected with one end of the heat source side heat exchanger, and the other end of the heat source side heat exchanger is connected with the four-way valve node through the throttling mechanism and the second heat interchanger. The heat pump device produces the hot water to refrigerate or heat in the operation process. The recycling produces the low temperature afterheat. In the process of refrigeration cycle in summer and heating cycle in winter, the super cooling of a refrigeration agent can be realized. The invention is suitable for the industrial and civil use.

The invention discloses a flapping-like rotor aircraft, which is characterized in that revolution spindles of flapping rotors are arranged on the two sides of a fuselage through flapping rotor supports, meanwhile, a front rotating arm and a rear rotating arm are correspondingly and perpendicularly fixed to the head end and the tail end of each revolution spindle respectively, and autorotation spindles are rotationally connected with the front rotating arms and the rear rotating arms respectively and located on the two sides of the revolution spindles respectively; a revolution motor drives therevolution spindle to revolve for a circle through a revolution transmission gear set, the revolution spindle drives the autorotation spindle to autorotate for a half circle through an autorotation transmission device, retractable upper single wings are arranged on the two sides of the back of the fuselage respectively, the height difference between the retractable upper single wings and the flapping rotor support is greater than the sum of the heights of the front rotating arm and the rotor mechanism, and meanwhile, the controller is electrically connected with the retractable upper single wing and a jet engine to control the working states of the retractable upper single wing and the jet engine. The invention provides a flapping-like rotor aircraft which improves the ascending efficiency and the navigation speed.

The invention discloses a canned food mixer, which is used for solving the problem that the food is easily damaged under the impact of the stirring blades of the mixer on the food. The present invention comprises a mixing tank and a stirring shaft extending into the mixing tank at one end. The stirring shaft is provided with a stirring blade, the upper end of the stirring shaft is connected with a transmission, the transmission is connected with a driving device, and nozzles are evenly distributed in the mixing tank, and the nozzles are in a spiral shape. Arranged in the mixing tank, the nozzle communicates with the external compressed air source through the pipeline. The invention can reduce the impact of the stirring blades on the food material and improve the stirring quality of the food material.

The invention relates to a water supply device, in particular to a modified rotary type water supply device used for a spray system. The water supply device comprises a main body (1), wherein a water cavity is arranged in the main body, the water cavity is provided with a water inlet pipe (2) connected with the water pump, a rotary impeller structure is arranged in the water cavity, a water pipe (15) is integrally arranged on the upper end of the rotary impeller structure, a center shaft (18) is arranged on the lower end of the rotary impeller structure, the rotary impeller structure (3) comprises main impellers (17), the water pipe penetrates through an upper bearing seat (5), the lower end of the main body is matched with a lower bearing seat (6), the water supply device is characterized in that the rotary impeller structure is divided into a reverse umbrella-shaped upper impeller (10), a middle impeller (11) and a lower impeller (12), wherein the reverse umbrella-shaped upper impeller (10), the middle impeller (11) and the lower impeller (12) are vertically connected through screws so as to form an integrated structure, an auxiliary impeller (9) is arranged between every two main impellers (17), a projection part on the upper end of the upper bearing seat (5) is provided with first drainage holes (7) which are arranged at an equal distance, and the lower bearing seat (6) is provided with second drainage holes (8) which are arranged at an equal distance. By adopting the technical scheme, the water supply device has the advantages of reasonable design, easiness in discharging ponding in the water cavity, long service life of the bearing, and strong impeller thrust.

The invention belongs to the technical field of chemical synthesis equipment and particularly discloses an acrylic polyurethane synthesis reactor. The acrylic polyurethane synthesis reactor comprisesa first drum, a supporting frame, a first driving unit, a synthesis unit and a gas storage chamber. By cooperation of the first driving unit, the second driving unit and the synthesis unit, on the onehand, gas pushes a fixing disc to move downwards, an acrylic polyurethane synthetic solution synthesizing route is increased through pushing of fan blades, completeness and uniformity in synthesis ofacrylic polyurethane synthetic solution are achieved, and accordingly acrylic polyurethane synthesis effects are improved; on the other hand, an inner ring is controlled to move vertically accordingto different liquid levels of the acrylic polyurethane synthetic solution, acrylic polyurethane synthetic solution unstirred in the first drum enters the second drum to be stirred, and accordingly acrylic polyurethane synthesis effects and efficiency are improved.

The invention discloses a mixing bucket of a canned food mixer, which is used for solving the problem that the food is easily damaged under the impact of the mixing blades of the existing mixer on the food. The invention includes a cylindrical inner shell and an outer shell, the inner shell and the outer shell are connected together to form a cavity of the mixing bucket; a nozzle is arranged in the cavity, and a through hole is opened on the inner shell, and the through hole The nozzle and the through hole of the nozzle are adapted to each other, and the nozzle communicates with the compressed air outside the mixing tank through the pipeline. The invention can reduce the impact of the stirring blades on the food material, reduce the damage of the food material, and improve the stirring efficiency.

The embodiment of the invention relates to a control method of an input device. The control method comprises the steps that a signal level judgment module determines whether an annular coil with the signal level larger than a first voltage threshold exists in a rough measurement feedback signal or not; if yes, the controller extracts a preset high voltage threshold value and a preset low voltage threshold value in the memory; the controller extracts a large voltage rough measurement coil and a small voltage rough measurement coil in the rough measurement feedback signals; the coil selection module is used for connecting the large-voltage rough measurement coils with the signal sending module in sequence according to the fine measurement instruction; the coil selection module is used for sequentially connecting the small-voltage rough measurement coils with the signal sending module through the phase reversal module; the signal receiving and processing module receives the accurate measurement feedback signal and sends the accurate measurement feedback signal to the controller; the signal level judgment module determines whether an annular coil of which the signal level is greater than a second voltage threshold exists in the accurate measurement feedback signal or not; if so, the controller extracts the maximum voltage fine coil and the minimum voltage fine coil in the fine feedback signal and generates an indication coordinate value.

The invention relates to the terahertz signal detection field, and especially to a room temperature terahertz detector based on a gallium nitride high electron mobility transistor and a preparation method thereof. The detector includes a gallium nitride high electron mobility transistor provided with a source electrode, a gate electrode, and a drain electrode, and also includes a nanometer antenna. The nanometer antenna is located between the source electrode and the drain electrode of the gallium nitride high electron mobility transistor and at one side of the gate electrode. The nanometer antenna is arranged at a distance from the gate electrode. One side of the gate electrode, adjacent to the nanometer antenna, is provided with a protrusion array having the corresponding shape and interval as the nanometer antenna. The protrusion array and the nanometer antenna form a tip-to-tip structure for increasing a terahertz electric field. The room temperature terahertz detector based on the gallium nitride high electron mobility transistor employs a unique nanometer antenna structure and combines a special gate electrode structure, effectively improves the coupling efficiency of the detector to a terahertz electromagnetic wave, and realizes the detection of the room temperature of the terahertz electromagnetic wave, and the high sensitive and low equivalent noise power.

The invention discloses an LED bulb with an efficient heat dissipation function. The LED bulb comprises a light source, a transparent lamp cover, a lamp body and a power supply. A light source is fixedly arranged on the upper portion of the lamp body, is electrically connected with the power supply arranged in the lamp body and is a columnar light-emitting column, and a plurality of SMD LED lamp beads are distributed on the radial surface of the light source. The edge of the upper portion of the lamp body is covered by the transparent lamp cover. The bulb further comprises a reflective cover, and the reflective cover comprises a barrel body and a bottom plate. The barrel body is arranged on the light-emitting column in a sleeved mode. Light-permeable holes are formed in positions, corresponding to the LED lamp beads, of the barrel body. The top end of the barrel body protrudes out of the transparent lamp cover and is provided with a ventilating hole. A horn-shaped bottom plate for covering the lamp body stretches outwards from the edge of the bottom end of the barrel body in the radial direction. A protrusion part is arranged on the bottom plate and corresponds to the light-permeable holes. A heat dissipation channel penetrating through the LED bulb is further arranged in the LED bulb. The LED bulb is high in brightness and good in heat dissipation effect, and light emitted by the LED bulb is soft and uniform.