36results about How to "Avoid internal friction" patented technology

The invention discloses a magnetic-driven linear reciprocating yarn guide device. The device comprises a friction roller, a bobbin and a yarn guide system, wherein the yarn guide system includes a slide block unit and a slide rail unit slidingly matched with each other; the slide block unit includes a top thrust winding, a left suspension winding, a right suspension winding and a slide block top plate; the slide rail unit includes a middle thrust permanent magnet, a left suspension permanent magnet, a right suspension permanent magnet, a left slide rail and a right slide rail; in operation, the other end of a yarn wound on the bobbin is connected with a front surface of the slide block top plate after passing through a yarn guide nozzle and a yarn guide rod in sequence; the left suspension winding, the right suspension winding, the left suspension permanent magnet and the right suspension permanent magnet correspondingly generate magnetic cooperation to suspend the left slide rail and the right slide rail; and meanwhile, the top thrust winding and the middle thrust permanent magnet generate magnetic cooperation to push the slide block top plate to perform a linear reciprocating motion. The device is lower in internal friction force, lower in energy consumption, higher in control precision, simple in structure and easy to machine.

The invention discloses a double-suction impeller, comprising a front cover board, a rear cover board, blades, a hub and a shaft, wherein the outlet edge of a water outlet is V-shaped; a partition plate which protrudes upwards is arranged on the peak of the V-shape and on the rear cover board; two edges of the partition plate are respectively in an inward concave arc shape; the partition plate is in smooth transition along the runner change shape. According to the double-suction impeller, the specific speed of the impeller is increased, the hydraulic loss is reduced to the maximal extent, and the double-suction impeller is symmetric in structure, free of axial force and stable in operation.

The invention provides a steaming and baking all-in-one machine. The machine comprises a cooking cavity, multiple cavity body inner walls forming the cooking cavity and at least one thermal insulationdevice, and the thermal insulation devices are connected to any two cavity body inner walls; the cooking cavity is divided into a steaming box cavity and an oven cavity under the action of the thermal insulation devices. Compared with an existing steaming and baking all-in-one machine which uses the same cooking space for steaming and baking, the steaming and baking all-in-one machine utilizes the thermal insulation device to divide the cooking space into the steaming box cavity and the oven cavity, and the problem that when steaming and baking are conducted at the same time, a heating pipe dries steam, and heat energy consumption is caused is effectively avoided.

The invention relates to a preparation method of a high-capacity high-safety solid-state lithium battery. The high-capacity high-safety solid-state lithium battery is prepared by taking a liquid metalcomplex prepared from liquid metal nanoparticles, carbon nanotubes and graphene as a negative active substance and taking solid electrolyte as an electrolyte. The negative active substance of the solid-state lithium battery adopts liquid metals, the carbon nanotubes and the graphene, wherein liquid metals tin and gallium have high energy density, can provide high capacity for the solid-state lithium battery, and thereby are ideal materials for a lithium battery with high energy density; the carbon nanotubes and the graphene are added to construct a three-dimensional frame which enables the lithium battery to have higher ionic conductivity; in addition, the three-dimensional frame has a complex structure and good mechanical properties, so that lithium dendrites formed on the surface of anode metal lithium can be inhibited, and the safety performance of the battery is improved; the cycle life of the battery is prolonged and the and the stability of the battery is improved; by adopting the solid electrolyte, the interface resistance can be greatly reduced to a great extent.

The invention discloses a multi-pump parallel connection multi-frequency-conversion synchronous speed regulating water supply control system and a control method thereof, and relates to the technicalfield of water supply equipment. The problem that water supply is low in efficiency and instable is solved. The system comprises a preset number of water pumps, frequency converters, a sensor, a PLC,a human-computer interface and an industrial 5G router. The water pumps of a preset number are connected together in a multi-pump parallel connection manner, and each single water pump is connected with the corresponding frequency converter; the PLC is connected with the frequency converters and controls running of the water pumps; the sensor is connected with the PLC; the human-computer interfaceis connected with the PLC and achieves human-computer interaction; and the industrial 5G router is connected with the human-computer interface, and equipment managers can remotely control the systemthrough the industrial 5G router. The control system is simple in structure, low in fault rate and precise in control, stepless speed regulating, synchronous frequency regulating, high efficiency andenergy saving are achieved, the multiple pumps are connected in parallel, and flow is subdivided.

The invention relates to a vehicle lifting device for a stereo garage. The vehicle lifting device comprises an upper ring beam, two clamping mechanisms arranged on the upper ring beam through a sliding rail, a telescopic shaft connected with the clamping mechanisms and a power take-off mechanism meshed with the telescopic shaft, wherein clamping arms arranged in a sliding manner have the capability of adapting to axle bases automatically and can adapt to the axle bases of all small-sized passenger cars; two sets of clamping trolleys are connected through a sleeve so as to be capable of adapting to axle base variation and transmitting torsion and to adapt to displacement and position variation of a pulley automatically; a connecting plate, a telescopic shaft and a sliding block are in rigid connection, so that the structure is simple, and clamping actions are transmitted accurately, besides, the output clamping force is great due to rigid connection, so that the device can be applied to heavy off-road vehicle; two actions can be output by one shaft through threads in opposite directions on a screw rod, and then the action that a tire is lifted by the two clamping arms can be realized, so that the structure is simple and convenient, and a set of transmission mechanism can be omitted.

The invention discloses a rapid connecting type photovoltaic junction box with a shelter. The junction box comprises a box body, a box cover, a positive binding post, a negative binding post and a bypass diode, wherein the positive binding post and the negative binding post are composed of internal and external binding posts respectively, the box body and the box cover are of an integrated structure, a part of the box cover can be opened from one side of the box cover to be connected with the box body through a side spreading portion in a snapping mode, and the box cover is provided with heat dissipation holes. The box body is provided with the shelter which is perpendicular to a box body main portion so that the shelter is applicable to a solar cell panel with bus bars which are led out from one side of the solar cell panel, and the tail of the shelter is provided with a step type structure so that two sub-junction boxes can form a{-shape junction box to lead out electrodes of a two-side cell. The internal and external binding posts are of an integrated structure and are integrated with the box body in an injection molding, and the internal binding post is connected with the bus bars in a pressing mode. The bypass diode is located on an external circuit, the external binding post is provided with a plier type structure which is used for achieving labyrinth type connection, and the external junction wire is led in from a leading wire port on one side of the junction box.

The invention provides an oil path sealing device and a processing method thereof and relates to a car part, in particular to an oil path sealing device and a processing method thereof. The oil path sealing device is good in sealing effect and long in service life. The oil path sealing device comprises a pipeline, a fastening bolt and a plug, wherein the fastening bolt is arranged on the pipeline in a sleeving manner; a through hole is formed in the middle of the plug, and a thread matched with the fastening bolt is formed on the inner side of the plug. According to the oil path sealing device and the processing method thereof provided by the invention, the plug is adopted for plugging the pipeline; a circular truncated cone-shaped plugging block is arranged in the plug, so that line sealing or surface sealing is formed between the pipeline and the plug; meanwhile, the fastening bolt is utilized for enhancing a sealing effect. A horn mouth adopts a double-layer design, so that the wear resistance of the horn mouth is further enhanced, and the service life is prolonged.

The invention relates to the technical field of a fuel cell, and specifically discloses a system and a method for removing coolant ions of a fuel cell online. Online detection and a bypass de-ionizing system with a cooling apparatus are designed in the system; according to the method, the coolant electrical resistivity is measured by adopting a conductive sensor; and when the conductive sensor detects that that the coolant electrical resistivity is less than 0.2M<omega>.cm, the bypass cooling de-ionizing system is started to perform de-ionizing online. The online de-ionizing system and method are energy-saving and environment-friendly, and low in input cost; and by virtue of the setting of the conductive sensor, the coolant electrical resistivity is detected so as to perform de-ionizing on an electric pile system online and in time, so that various kinds of conductive ions generated in the operation of the fuel cell are effectively removed, internal consumption of the system is avoided, the power generation efficiency of the electric pile is improved, and the insulativity of the electric pile is enhanced.

The invention relates to an energy-saving type water collecting device. The water collecting device comprises a shell, a water outlet pipe and at least one water inlet pipe; the shell is conical, a conical flow guide core is sleeved with the shell, a spiral flow guide device is arranged on the outer surface of the flow guide core, the water inlet pipes are evenly distributed on the outer side of the shell and are tangent with the shell, and the tangent position is located between two adjacent spirals of the flow guide device; the water flow of the water inlet pipes are the same with the spirals of the flow guide device in the rotating direction of the shell, the water outlet pipe is located at the end of the shell and is tangent with the shell, and the water outlet direction of the water outlet pipe is the same with the spiral direction of the flow guide device. Through the cooperative arrangement of the flow guide core, the shell and the flow guide device, water flows in the water collecting device run in a sequential manner, the turbulent impact is reduced as much as possible, the water flow internal consumption is reduced, two problems of impact losses and noise in the prior artcan be solved, and the positive technical significance is achieved.

The invention discloses a braking device and a boarding bridge. The braking device comprises a brake, brake wheels, two brake follower wheels and brake belts which are mounted on an airport-pick-up opening. The brake comprises a shell, brake assemblies installed in the shell and brake shafts rotatably mounted on the shell, the brake wheels are mounted at the end portions, extending out of the shell, of the brake shafts, the two brake follower wheels are rotatably mounted on the airport-pick-up opening, the brake band meshes with the two brake follower wheels and the brake wheels, and the brakebelts are arranged along the outer circumference of a passage circular platform and both ends are fixed to the passage circular platform. Under the normal working condition of driving belts of rotating drive devices, the brake shafts are released by the brake assemblies, so that the brake shafts are rotated, when the length, between driving follower wheels and driving wheels, of driving belts ofdriving devices exceeds a set value or in a breaking state, and the rotation of the brake shafts are blocked by the brake assemblies to achieve braking. According to the braking device and the boarding bridge, the internal consumption is low and braking is timely and reliable.

The invention relates to a device provided with a diversion plate and an adjustable valve body, which is suitable for matching with complete equipment for processing mineral slurry. It includes a housing with a material inlet and a material outlet. There are at least two deflectors in the housing. The surface forms a frictional impact surface; the surface of the guide plate and its valve body arranged oppositely forms a jet cavity for mineral slurry; at least one guide plate and its valve body are provided with a through hole, and the through hole forms a slurry channel; The area where the feed channel communicates with the jet cavity forms an impact cavity. The beneficial effect of the present invention is that: the deflector plate can guide the path where the mineral slurry enters, and the valve body provided on it can not only change the volume of the impact chamber, but also provide space for material fragments. By adjusting the distance between the corresponding valve bodies through the driving mechanism, the jet pressure entering the cavity can be changed, and the crushing particle size can be effectively controlled.

The invention discloses a multi-roller synchronous control method and a related device. The multi-roller synchronous control method comprises the steps that the linear speed of a main pinch roll motor and the linear speed of an auxiliary pinch roll motor are given; according to the linear speed, determining a master frequency given value of a slave pinch roll motor; when it is judged that the working state of the slave pinch roll motor is the power generation state, the working state of the slave pinch roll motor is adjusted from the power generation state to an electric state; the output torque of the main pinch roll motor running at the linear speed is used as the given value of the speed regulation PID of the auxiliary pinch roll motor, the output torque of the auxiliary pinch roll motor in the electric state is used as the feedback value of the speed regulation PID, and the output of the speed regulation PID is used as the auxiliary frequency given value of the auxiliary pinch roll motor; and superposing the main frequency given value and the auxiliary frequency given value to obtain a frequency given value of the slave pinch roll motor. According to the method, the linear speed synchronization of the driving pinch roll motor and the driven pinch roll motor can be realized without an external sensor, and the internal friction phenomenon is avoided.

The invention discloses a magnetic-driven linear reciprocating yarn guide device. The device comprises a friction roller, a bobbin and a yarn guide system, wherein the yarn guide system includes a slide block unit and a slide rail unit slidingly matched with each other; the slide block unit includes a top thrust winding, a left suspension winding, a right suspension winding and a slide block top plate; the slide rail unit includes a middle thrust permanent magnet, a left suspension permanent magnet, a right suspension permanent magnet, a left slide rail and a right slide rail; in operation, the other end of a yarn wound on the bobbin is connected with a front surface of the slide block top plate after passing through a yarn guide nozzle and a yarn guide rod in sequence; the left suspension winding, the right suspension winding, the left suspension permanent magnet and the right suspension permanent magnet correspondingly generate magnetic cooperation to suspend the left slide rail and the right slide rail; and meanwhile, the top thrust winding and the middle thrust permanent magnet generate magnetic cooperation to push the slide block top plate to perform a linear reciprocating motion. The device is lower in internal friction force, lower in energy consumption, higher in control precision, simple in structure and easy to machine.

The invention relates to a combined drum chipper suitable for cutting thick blocks, thin sheets or strip-shaped wooden objects. The combined drum chipper is used for cutting the thick blocks, the thinsheets or the strip-shaped wooden objects into pieces. The combined drum chipper is composed of a machine body and a feeding port upper jaw; the machine body includes a rack, a knife drum, a bottom knife and a feeding port lower jaw, the knife drum and the bottom knife are installed on the rack, and the feeding port upper jaw is hinged to the rack. The combined drum chipper is characterized in that the feeding port upper jaw is an assembly and is characterized in that a motor combined with a retarding mechanism is directly installed on the rear portion of the upper surface of an upper jaw upper cover plate through an installing base and a base plate; and the feeding opening upper jaw combined with the machine body to be used is one or two or three of a transverse tooth feeding opening upper jaw, a longitudinal tooth feeding opening upper jaw and a conic tooth feeding opening upper jaw. The combined drum chipper has the advantages that the mechanical integration is high, the feeding port upper jaw can serve as a small-volume device to be singly produced, and the feeding port upper jaw in needed types can be used in social production according to the amount of specific types of wooden object raw materials and time required by cutting.

The invention relates to an automatic mechanical garage vehicle carrying platform which comprises a bearing mechanism for bearing vehicles, a push mechanism, a transmission mechanism and a controller. As a power structure for pushing the vehicles is arranged on the bearing mechanism, the structure of a push platform is eliminated, the thickness of the push platform is reduced, the automatic mechanical garage vehicle carrying platform is applicable to vehicles with low chassis, and the specific structural optimization has the technical effects that a push structure of an upper ring beam is simple, free of power, relatively light and thin, and applicable to vehicles with relatively low chassis, vehicles of which the tires are not sufficiently inflated can be taken out, two transmission systems are independent from each other, the structure is simple, the fault rate is low due to the rigid connection, the mechanical action transmission is accurate, the independence of the equipment mechanisms is high, the equipment mechanisms can be directly replaced, the equipment maintenance time is shortened, the alternative repairing can performed, most space is further saved as walking wheels are embedded into the ring beam, the whole platform is thinned, the size is reduced, and the vehicles can be carried relatively stably.

The invention relates to a vehicle reinforcing pushing platform for a mechanical garage. The vehicle reinforcing pushing platform comprises an upper ring beam, two clamping mechanisms, a telescopic shaft and a power output mechanism, wherein the two clamping mechanisms are arranged on the upper ring beam by sliding rails; the telescopic shaft is connected with the clamping mechanisms; the power output mechanism is meshed with the telescopic shaft; clamping arms arranged in a sliding manner are automatically suitable for an axle distance and can be suitable for axle distances of all small-scale passenger vehicles; two groups of clamping trolleys are connected by a sleeve shaft, so that the vehicle reinforcing pushing platform for the mechanical garage not only can be suitable for axle distance variation, but also can transmit torsion and is automatically suitable for variation of the displacement positions of pulleys; connection among connecting plates, the telescopic shaft and sliding blocks is rigid connection; the vehicle reinforcing pushing platform for the mechanical garage has a simple structure; the clamping action is accurately transferred in place; rigid connection outputs a large clamping force and a heavy off-road vehicle can be used; and screw threads of one screw rod in the two directions can implement output of two actions by one shaft and are suitable for the action that two clamping arms lift up a tire. Therefore, the vehicle reinforcing pushing platform for the mechanical garage has a simple structure and is convenient and a set of transmission mechanism is omitted.

The invention relates to a vehicle lifting device with the automatic-resetting function for a stereo garage. The vehicle lifting device comprises an upper ring beam, two clamping mechanisms arranged on the upper ring beam through a sliding rail, a telescopic shaft connected with the clamping mechanisms and a power take-off mechanism meshed with the telescopic shaft, wherein clamping arms arranged in a sliding manner have the capability of adapting to axle bases automatically and can adapt to the axle bases of all small-sized passenger cars; two sets of clamping trolleys are connected through a sleeve so as to be capable of adapting to axle base variation and transmitting torsion and to adapt to displacement and position variation of a pulley automatically; a connecting plate, a telescopic shaft and a sliding block are in rigid connection, so that the structure is simple, and clamping actions are transmitted accurately, besides, the output clamping force is great due to rigid connection, so that the device can be applied to heavy off-road vehicle; two actions can be output by one shaft through threads in opposite directions on a screw rod, and then the action that a tire is lifted by the two clamping arms can be realized, so that the structure is simple and convenient, and a set of transmission mechanism can be omitted.

The invention discloses a brake device and a boarding bridge. The boarding bridge includes a passage circular platform, an airport pickup opening and a rotary driving device. The rotating driving device comprises a driving motor mounted on the airport pickup opening, a driving wheel mounted on the output shaft of the driving motor, two driven wheels mounted on the airport pickup opening, and a driving belt. The driving belt is matched with the driving wheel and the driven wheels, and the two ends of the driving belt are fixed on the passage circular platform. The braking device comprises a retaining member and at least one set of brake assembly. The retaining member is fixed on the passage circular platform. The brake assembly includes a movable assembly movably mounted on the airport pickup opening and an elastic member and a control assembly with pre-load force. Under normal working condition, the control assembly is in contact with the elastic member to balance the pre-load force; and when the driving belt is loose or broken, the control assembly separates from the elastic member, the movable assembly moves to the retaining member under the pre-load force of the elastic member and is matched with the retaining member to achieve the brake. According to the brake device and the boarding bridge, the braking device is timely and reliable in the brake.

The invention discloses a mechanical power device taking a spring as a power source, belonging to the technical field of mechanical power equipment. According to the technical scheme, the mechanical power device taking a spring as a power source comprises a rack, a power converter mounted on the rack and a power output shaft, and the mechanical power device is characterized in that the mechanical power device is a power converter group formed by connecting at least two power converters consisting of coil type motive power springs in series, wherein transmission gears of the two power converters are respectively meshed with transition gears coaxially arranged on a transition shaft; and a transmission gear on the transition shaft is meshed with a power input gear on the power output shaft. Compared with the prior art, the device disclosed by the invention has the outstanding substantial characteristics and remarkable development that the mechanism design is reasonable, the performance is reliable and green and clean energy can be provided for the society by adopting the spring as the power source.

The invention relates to complete mineral slurry processing equipment with a coarse mineral slurry pressure building up stream line and a stream line for making minerals into slurry. The equipment comprises a mineral crushing and grinding stream line, an additive solution preparing stream line, a stream line for preparing coarse mineral slurry from ground mineral powder, the coarse mineral slurrypressure building up stream line matched with the stream line for preparing coarse mineral slurry and the stream line for making minerals into slurry matched with the pressure building up stream line, wherein the stream line for making minerals into slurry comprises a mineral slurry refining device matched with the pressure building up streamline. The equipment has the advantages that a pressure building up steam line is added, bonding force and affinity between minerals and water are increased and easy generation of hard sedimentation is avoid; and a guide disc arranged on the mineral slurryrefining device can guide the mineral slurry to flow in and a valve arranged on the mineral slurry refining device can change the volume of an impact cavity and provide a space for material particles.

The invention relates to a process for preparing natural gas by closed circulation and comprehensive use of synthetic ammonia after-tower gas. Low-pressure methane synthesis system after-tower gas isgenerated by a low-pressure methane synthesis system and sent into a low-pressure cold box, and nitrogen gas is injected into the low-pressure cold box at the same time, so that methane is removed under a low pressure and at -85 DEG C to -57 DEG C; the remaining gas is compressed by a six-stage high-pressure machine and sent to a synthetic ammonia system for reaction to produce synthetic ammonia,and along with the production of the synthetic ammonia, purge gas and recycle gas are combined to form synthetic ammonia after-tower gas containing 3% of ammonia and 24% of methane; the synthetic ammonia after-tower gas is sent to a first high-pressure cold box, so that ammonia is removed under a high pressure and at -109 DEG C to -73 DEG C; the remaining synthetic ammonia after-tower gas is sentto a second high-pressure cold box, and nitrogen gas is injected into the second high-pressure cold box at the same time, so that methane is removed under a high pressure and at -193 DEG C to -129 DEGC; and the methane is sent to a natural gas storage tank for storage, and the remaining gas is sent to the synthetic ammonia system through a circulation machine to produce synthetic ammonia. The design is reasonable, the concept is ingenious, and the design purpose of one tower and two products is realized.

The invention relates to the field of stereo garage devices, in particular to a vehicle fetching platform used for a cylinder-type stereo garage. The vehicle fetching platform comprises a platform body used for parking vehicles, a correction system arranged on the platform body and used for correcting left and right positions of the vehicles, a carrying mechanism for carrying the vehicles, a pushing mechanism, a transmission mechanism, a support pin telescoping mechanism with flat bed supporting function and a controller for controlling the mechanisms. The vehicle fetching platform is reasonable in structure, stable to operate, efficient and stable and is suitable for fetching vehicles from the cylinder-type stereo garage.

The invention provides a road piezoelectric power generation device and a power generation system under asynchronous vehicle load action. Road piezoelectric power generation devices arranged symmetrically on the same cross section of a road are connected in parallel first, and then connected with a rectifier circuit, the output end of the rectifier circuit is equipped with a diode allowing current to be output only from the rectifier circuit, and a generator set is formed on the same cross section of the road. All the generator sets are connected in parallel, and then connected with a load through a filter circuit. The action forces consistent in magnitude and direction on the surfaces of piezoelectric ceramic power generation chips ensure that all the piezoelectric ceramic power generation chips output alternating current in step. By adopting the system, reverse flow of electric energy is blocked, the problem that the electric energy of the road piezoelectric power generation devices arranged at intervals along the driving direction is consumed internally under direct and inverse piezoelectric effects is avoided, and effective output of all electric energy is ensured.

The invention relates to a single-shaft transmission clamping wheel device for a mechanical garage. The single-shaft transmission clamping wheel device comprises an upper ring beam, two groups of clamping mechanisms and a telescopic shaft, wherein the two groups of clamping mechanisms are arranged on the upper ring beam by sliding rails; the two groups of clamping mechanisms are connected in series by the telescopic shaft; the power output mechanism is meshed with the telescopic shaft; each clamping mechanism comprises a pulley arranged on the upper ring beam by the corresponding sliding rail, a guide chute fixedly formed on the pulley, a sliding block arranged in the chute by the telescopic shaft and a clamping wheel arm which is arranged on the pulley by a fixed shaft, is used for clamping and lifting up an automobile tire and is arranged in pairs; clamping arms arranged in a sliding manner are automatically suitable for an axle distance and can be suitable for axle distances of all small-scale passenger vehicles; two groups of clamping trolleys are connected by a sleeve shaft, so that the single-shaft transmission clamping wheel device for the mechanical garage not only can be suitable for axle distance variation, but also can transmit torsion and is automatically suitable for variation of the displacement positions of the pulleys; connection among connecting plates, the telescopic shaft and the sliding blocks is rigid connection; the single-shaft transmission clamping wheel device for the mechanical garage has a simple structure; the clamping action is accurately transferred in place; rigid connection outputs a large clamping force; and a heavy off-road vehicle can be used.

The application discloses a driving and control all-in-one machine and a robot driving and control system. The driving and control all-in-one machine is used for being connected with an upper computerand a motor, and is used for driving the motor under the control of the upper computer so as to further control a robot connected with the motor. The driving and control all-in-one machine comprisesa controller, a wireless communication module and a driver, wherein the controller is used for acquiring a control instruction sent by the upper computer and carrying out processing on the control instruction so as to obtain a driving instruction; and the driver is connected with the controller and the wireless communication module and is used for sending the driving instruction to the motor by the wireless communication module so as to control the motor. In the mode, communication between the driving and control all-in-one machine and the motor as well as the robot is convenient to carry out,a position of the industrial robot can be randomly changed in a workshop, and adaptability and expandability of the driving and control all-in-one machine are improved.

The invention relates to a magnetic control power machine. The magnetic control power machine belongs to an electric machine or an energy source power output machine. The magnetic control power machine solves the problems of energy conservation and new energy resource development of motors. The technical proposal comprises that: a power output shaft 2 is supported by a machine seat 1; a rotating wheel 3 is fixed on the shaft; a permanent magnet 4 is arranged at the top end of the rotating wheel 3; and a magnetic control part 5 is arranged to match with the permanent magnet. The product can be used for supplying power or supplying energy output power.