Abstract: A counter-rotating fan includes a frame, an inlet fan, and an output fan. The inlet fan is disposed in the frame. The inlet fan includes an inlet body and a plurality of inlet blades. The inlet blades are spaced apart from each other and disposed around the inlet body. The output fan is disposed in the frame and opposite to the inlet fan. The output fan includes an output body and a plurality of output blades. The output blades are spaced apart from each other and disposed around the output body. A rotational direction of the output blades is opposite to a rotational direction of the inlet blades, an end of each o output blade away from the output body curves towards the inlet blades. The present disclosure further provides a heat dissipating device.

Abstract: An impeller for heat dissipation fan includes a hub and blades, the blades are arranged around the hub. An inlet side and an outlet side, in an axial direction of the impeller, the inlet side is defined at an end of the impeller, the outlet side is defined at another end of the impeller. Each of the blades comprises a windward surface and a leeward surface opposite to the windward surface, the side of the blade back from the hub is an outer edge, and the side of the blade corresponding to the inlet side is a front edge, a first connection region is connected between the outer edge and the front edge, and the first connection region is arc-shaped where the windward surface connected to the leeward surface.

Abstract: An impeller for heat dissipation fan includes a hub and blades, the blades are arranged around the hub. An inlet side and an outlet side, in an axial direction of the impeller, the inlet side is defined at an end of the impeller, the outlet side is defined at another end of the impeller. Each of the blades comprises a windward surface and a leeward surface opposite to the windward surface, the side of the blade back from the hub is an outer edge, and the side of the blade corresponding to the inlet side is a front edge, a first connection region is connected between the outer edge and the front edge, and the first connection region is arc-shaped where the windward surface connected to the leeward surface.

Abstract: A printed circuit board transmits the collected current and voltage signals of different regions in a membrane electrode assembly inside the fuel cell to PCB connectors, and transmits the current and voltage signals to a data collection module by means of mating of a male of the connector, a female and a male of the standard harness. The current and voltage signals of the PCB connectors are identified, and a local current density of the fuel cell represented by each signal is positioned according to the position matching relationship, so that the current density distribution in the entire membrane electrode assembly of the fuel cell is finally obtained. According to the scheme, stable and reliable transmission of current and voltage signals of different regions on the membrane electrode assembly inside the fuel cell to the data collection system is realized.

Abstract: A fan frame includes a central base, a frame wall, and a plurality of static blades radially extending from the central base to the frame wall, each static blade is connected to the central base at a first end and connected to the frame wall at a second end, the central base is provided with a first wire groove, the frame wall is provided with a second wire groove, the first wire groove and the second wire groove are configured for accommodating wires, and the second wire groove has a shape same as the second end of the static blade connected to the frame wall for gathering the wires to shape similar to the static blade. A fan assembly including the fan frame is also disclosed.

Abstract: A drilling device with a controllable femtosecond laser processing taper includes a femtosecond laser and a precision motion table. A support mechanism is provided along the central axis of the precision motion table, and a clamp is provided on the top of the support mechanism. The output end of the femtosecond laser is provided with a beam expander. The output end of the beam expander is provided with a reflection mirror. The output end of the reflection mirror is provided with a beam scanning module. The output end of the beam scanning module is provided with a semi-focusing mirror. The output end of the semi-focusing mirror is provided with a semi-transmissive reflection mirror arranged at 45 degrees. The reflection output end of the semi-transmissive reflection mirror is provided with a high-precision three-dimensional on-line monitoring module, and the transmission output end of the semi-transmissive reflection mirror faces the clamp.

Abstract: A fan frame with an improved heat dissipation performance includes a frame body, a plurality of stationary blades, and a central base. The frame body defines a flow channel, the central base is arranged within the flow channel and divides the flow channel into flowing zones. Each of the flowing zone includes a high-pressure zone and a low-pressure zone. The central base defines first slot, second slot and receiving groove between the first slot and the second slot, the first slot communicates the high-pressure zone and the receiving groove, the second slot communicates the low-pressure zone and the receiving groove.

Abstract: A cooling fan creating a more stable airflow for heat-removing purposes, with reduced noise of operation, comprises a rotor hub and preferably an odd number of blades mounted on periphery of the rotor hub in unequal intervals. Adjacent blades are configured with different shapes, reducing the noise generated during operation without affecting the cooling effect.

Abstract: A three-bladed impeller providing a cooling airflow in air, with increased heat-dissipating efficiency and reduced noise includes a hub and three blades, the blades are arranged around the hub. Each blade is arched along its axial length from the front of fan to the back and also arched radially from the hub end of each blade to the outside tip. The back edge of each blade includes first and second slots, arranged alternately, the width of each first slot is ?1, the width of each of each second slot is ?2, the comparative sizes between ?2 and ?1 are in a ratio range of 1.6:1 to 1.8:1 (?2:?1).

Abstract: The invention discloses a system for hole making for an aircraft skin by normal positioning and locking. The hole-making system includes a posture adjustment part, a normal positioning and locking part and a hole-making execution part. This system solves the problems that the device in the prior art has high complexity and cumbersome positioning and does not adapt to complex curved surfaces, thereby failing to satisfy the needs of efficient hole making in different space states. In the present invention, the expansion of an outer expansion sleeve in a bottom sleeve locks a normal direction for hole making, thereby ensuring the positioning accuracy of the normal direction. An axial position is locked by the mutual cooperation of an axial positioning groove of the bottom sleeve and an axial positioning rib of the outer expansion sleeve. A hole-making auxiliary cylinder contracts to counteract part of an axial force for hole making.

Abstract: A fan frame with an improved heat dissipation performance includes a frame body, a plurality of stationary blades, and a central base. The frame body defines a flow channel, the central base is arranged within the flow channel and divides the flow channel into flowing zones. Each of the flowing zone includes a high-pressure zone and a low-pressure zone. The central base defines first slot, second slot and receiving groove between the first slot and the second slot, the first slot communicates the high-pressure zone and the receiving groove, the second slot communicates the low-pressure zone and the receiving groove.

Abstract: A three-bladed impeller providing a cooling airflow in air, with increased heat-dissipating efficiency and reduced noise includes a hub and three blades, the blades are arranged around the hub. Each blade is arched along its axial length from the front of fan to the back and also arched radially from the hub end of each blade to the outside tip. The back edge of each blade includes first and second slots, arranged alternately, the width of each first slot is ?1, the width of each of each second slot is ?2, the comparative sizes between ?2 and ?1 are in a ratio range of 1.6:1 to 1.8:1 (?2:?1).

Abstract: A fan includes a hub, a plurality of fan blades arranged around the hub and connected to the hub, and a plurality of guiding parts. Each of the plurality of fan blades comprises a windward surface and a leeward surface facing away from the windward surface. Each of the plurality of guiding parts is arranged on each of the plurality of fan blades. Each of the plurality of guiding parts comprises a plurality of guiding portions. Each of the plurality of the guiding portions protrudes from or is recessed in the windward surface or the leeward surface.

Abstract: A fan module includes a first fan frame and a second fan frame. A side surface of the first fan frame includes a number of latching posts and a number of positioning portions extending toward the second fan frame. A side surface of the second fan frame defines a number of latching grooves in one-to-one correspondence with the latching posts. The side surface of the second fan frame further defines a number of rotating grooves in one-to-one correspondence with the positioning portions. Engagement between the latching posts and the latching grooves restricts a tangential relative displacement between the first fan frame and the second fan frame. Engagement between the rotating grooves and the positioning portions restricts an axial displacement between the first fan frame and the second fan frame.

Abstract: A drilling device with a controllable femtosecond laser processing taper includes a femtosecond laser and a precision motion table. A support mechanism is provided along the central axis of the precision motion table, and a clamp is provided on the top of the support mechanism. The output end of the femtosecond laser is provided with a beam expander. The output end of the beam expander is provided with a reflection mirror. The output end of the reflection mirror is provided with a beam scanning module. The output end of the beam scanning module is provided with a semi-focusing mirror. The output end of the semi-focusing mirror is provided with a semi-transmissive reflection mirror arranged at 45 degrees. The reflection output end of the semi-transmissive reflection mirror is provided with a high-precision three-dimensional on-line monitoring module, and the transmission output end of the semi-transmissive reflection mirror faces the clamp.

Abstract: A fan module includes a first fan frame and a second fan frame. A side surface of the first fan frame includes a number of latching posts and a number of positioning portions extending toward the second fan frame. A side surface of the second fan frame defines a number of latching grooves in one-to-one correspondence with the latching posts. The side surface of the second fan frame further defines a number of rotating grooves in one-to-one correspondence with the positioning portions. Engagement between the latching posts and the latching grooves restricts a tangential relative displacement between the first fan frame and the second fan frame. Engagement between the rotating grooves and the positioning portions restricts an axial displacement between the first fan frame and the second fan frame.

Abstract: The invention discloses a system for hole making for an aircraft skin by normal positioning and locking. The hole-making system includes a posture adjustment part, a normal positioning and locking part and a hole-making execution part. This system solves the problems that the device in the prior art has high complexity and cumbersome positioning and does not adapt to complex curved surfaces, thereby failing to satisfy the needs of efficient hole making in different space states. In the present invention, the expansion of an outer expansion sleeve in a bottom sleeve locks a normal direction for hole making, thereby ensuring the positioning accuracy of the normal direction. An axial position is locked by the mutual cooperation of an axial positioning groove of the bottom sleeve and an axial positioning rib of the outer expansion sleeve. A hole-making auxiliary cylinder contracts to counteract part of an axial force for hole making.

Abstract: A fan includes a fan frame, a stator fixedly mounted in the fan frame, and a rotor fixedly mounted in the fan frame. The rotor includes an impeller. The impeller includes a main body and a number of blades equally spaced around a periphery of the main body. The main body includes a top portion and a side portion. The top portion has an annular shape. The side portion has a cylindrical shape and extends from a peripheral edge of the top portion. A number of heat dissipating portions protrudes from an inner side of the top portion. The heat dissipating portions are arranged at intervals.

Abstract: A vibration-proofed fan frame includes a housing and a base surrounded by the housing. A hollow tube is arranged on the base and has the rotary connection with an impeller of the heat dissipation fan. The base includes a disc and a plurality of ribs extending outwards from periphery of the disc. The fan frame further includes a buffer member within the structural interconnections between the disc and the housing. The buffer member includes first elements. The first elements are embedded in the disc. A heat dissipation fan having the fan frame described is also presented.