9results about How to "Avoid frictional heat" patented technology

The utility model provides an angular contact ball bearing retainer, retainer injection molding device and angular contact ball bearing, wherein the bearing retainer comprises an annular frame body, a plurality of pockets are constructed on the annular frame body, each pocket penetrates through the inner and outer ring wall surfaces of the annular frame body along the radial direction of the annular frame body, and the pockets are uniformly arranged at intervals along the circumferential direction of the annular frame body; each pocket is defined by two oppositely-arranged planes and two oppositely-arranged cylindrical arc faces, the two planes are parallel to the radial face of the annular frame body, the two cylindrical arc faces are located on the same cylindrical face, and the axis of the cylindrical face is parallel to the central axis of the annular frame body. According to the utility model, the grease storage space in the pocket is increased, so that the lubricating effect on the rolling ball is improved; the contact area between the rolling ball and the retainer in the circumferential direction of the retainer during bearing operation is reduced, friction heat is reduced, and grease denaturation caused by too high temperature is avoided; the lateral force effect of the retainer on the rolling balls during bearing operation is eliminated, the stability of the bearing is improved, and the service life of the bearing is prolonged.

This invention proposes a high-rigidity, high-precision external cylindrical grinding wheel spindle, comprising a housing, a spindle sleeve installed within the housing, and a shaft core rotatably installed within the spindle sleeve, the shaft core being supported by a front bearing assembly and a rear bearing assembly. It also includes a preload structure for applying and adjusting axial preload to the front bearing assembly, thereby enhancing the system rigidity of the shaft core. This invention improves the system rigidity of the grinding spindle by employing a four-section angular contact ball bearing layout at the front end of the spindle, combined with precision grinding of inner and outer spacers or thermal expansion compensation sleeves. This allows the spindle to withstand greater grinding forces and directly guarantees the highest rotational accuracy at the working end. The rear end of the spindle adopts a floating bearing assembly design, which eliminates destructive thermal stress and protects the preset precision preload state of the front bearing assembly, thus ensuring that the spindle maintains high precision throughout the entire temperature rise process.

This utility model relates to the field of bearing technology and discloses a bearing with a cage tension adjustment structure, including an adjustment assembly comprising a bearing outer ring, an annular groove, and an annular inclined surface. This utility model achieves dynamic adjustment of the cage tension by rotating the adjustment ring to drive the adjustment block and the movable ring axially, utilizing the annular inclined surface of the movable ring to convert the axial force into radial force. This allows for flexible adaptation to various operating conditions such as speed and load, avoiding excessive tightness leading to frictional heat and increased wear, or excessive looseness causing uneven rolling element distribution, vibration, and noise. It solves the problem of existing bearing cages being unable to dynamically adjust tension. Simultaneously, the adjustment tool, consisting of an adjustment hole, adjustment rod, and annular adjustment cap, combined with the directional guiding effect of the limiting block and limiting groove, makes the adjustment operation more convenient and stable, overcoming the shortcomings of traditional cage structures being simple and limited in adjustment, and meeting the needs of diverse working scenarios and complex operating conditions.

The invention relates to a side channel compressor (1) for a fuel cell system (31) for conveying and / or compressing a gaseous medium, in particular hydrogen, comprising: a housing (3) and a drive (6); a compressor chamber (30) which extends in the housing (3) about an axis of rotation (4) and which has at least one circumferential side channel (19, 21); the invention relates to a side-channel compressor (1) having a housing (3), a rotor chamber (44) in the housing (3), and a compressor wheel (2) in the rotor chamber, which compressor wheel is rotatably arranged about the axis of rotation (4) and is driven by means of the drive (6), the side-channel compressor (1) having at least one bearing (27, 47) on a cylindrical bearing tongue (12), and wherein the corresponding bearing (27, 47) is arranged in the rotor chamber (44). 47) has a bearing outer ring (24), a bearing inner ring (22) and a bearing inner chamber (40) which is sealed from the rotor chamber (44) by means of at least one sealing element (26). According to the invention, the bearing inner chamber (40) can be separated from the rotor chamber (44) by a sealing element (26) in such a way that either a frictional seal or a contactless seal can be established between the bearing inner ring (22) and the sealing element (26) depending on the operating state of the side channel compressor (1). The present application also relates to a fuel cell system (31) having the side channel compressor (1) of the present application.

The present invention discloses a feeding jig applied to heat shrinkable tubes, and relates to the technical field of heat shrinkable tube production, specifically a feeding jig applied to heat shrinkable tubes, comprising: a main clamp, a first tube groove is provided on one side of the main clamp, a first slide groove is provided on the other side of the main clamp, a first connecting hole is provided on the inner wall of the first slide groove, a fixing hole is provided on one side of the first connecting hole, and an air hole is provided on the inner wall of the first tube groove. The feeding jig applied to heat shrinkable tubes is provided with air holes and airways to enable the air injected by the air injection pipe to pass into the cylindrical cavity formed by the first tube groove and the second tube groove, and reduces the friction between the heat shrinkable tube and the inner walls of the first tube groove and the second tube groove when passing through through a principle similar to an air cushion track, thereby reducing the loss of the heat shrinkable tube surface during the transportation process, and reducing the heat generated by friction by reducing friction, thereby preventing the heat shrinkable tube from being deformed due to frictional heat.

A kind of magnetorheological damper using permanent magnetic seal ring, including cylinder assembly, piston assembly;Cylinder assembly includes working cylinder, working cylinder one end is sealed through sealing guide mechanism and is sealed with piston rod;Working cylinder other end is provided with gas compensation assembly;Piston assembly includes piston rod, and piston rod is connected with piston head assembly;Piston head assembly includes piston sleeve, and iron core is arranged in piston sleeve, and the left and right ends of iron core are correspondingly clamped with upper end cover and lower end cover and are combined into an integral whole with piston sleeve;Excitation coil is provided in piston sleeve and located outside iron core, and excitation coil controls the damping performance of magnetorheological fluid.The magnetorheological damper using permanent magnetic seal ring provided by the application can effectively reduce the leakage of magnetorheological fluid.

The invention belongs to the field of preparation of propellant oxidant materials, and relates to a method for preparing ADN-based composite microspheres through layer-by-layer assembly, preparation of a binder oil phase containing solid particles, preparation of an ADN water phase, preparation of a homogeneous emulsion, preparation of the ADN-based composite microspheres through layer-by-layer assembly of the binder / solid particles and application of the ADN-based composite microspheres in a solid propellant. The hydroscopicity of the prepared microspheres is reduced by 80% or above compared with that of the raw material ADN, the obtained ADN-based composite microsphere particles are added into a solid composite propulsion formula, a combustion test is carried out under the same humidity condition, and if the raw material ADN propellant is not ignited, the ADN-based composite microsphere propellant has obvious flames and is stable in combustion. The homogeneous emulsion is simple in preparation process, mild in reaction condition and simple and safe to operate, a high polymer bonding system in the oil-phase solvent can be selected from various types, and the method for reducing the hygroscopicity of the ADN by coating a layer of hydrophobic material on the basis of introducing an active coating into the homogeneous emulsion has a remarkable anti-hygroscopicity effect.

The utility model discloses a quartz mortar stirring device for square crucible production, the quartz mortar stirring device comprises a tank body and an inner tank, the tank body is internally provided with a cavity, the inner tank is mounted in the cavity, the inner wall of the cavity is provided with a first spiral groove, the outer wall of the inner tank is provided with a second spiral groove at a position corresponding to the first spiral groove, and the outer wall of the inner tank is provided with a second spiral groove. The second spiral groove is attached to the first spiral groove. According to the quartz mortar stirring device disclosed by the invention, cooling water can circularly flow in the spiral cooling channel to cool the slurry, various raw materials are prevented from being rubbed with the stirring blades to increase the temperature, the situation that the quality of a crucible green body is affected due to temperature rise and deterioration of part of substances in the slurry is avoided, and the quality of the crucible green body can be improved according to the temperature of the slurry. The temperature of the cooling water circularly entering the spiral cooling channel is changed, so that the temperature of the cooling water is consistent with the temperature of the slurry, the temperature of the quartz slurry is controlled, and the quality of a quartz crucible is improved.

The utility model discloses a high-efficiency injection molding particle mixing device, which comprises a barrel body, a mixing cover, a spoiler, a stirring arm, a ventilation net, a main shaft and a driving motor, the top of the barrel body is provided with a plurality of material storage cavities, the bottom of each material storage cavity is provided with a discharge port, the bottom of the barrel body is provided with a mixed material outlet and a ventilation net wrapping the periphery of the mixed material outlet, and the main shaft is arranged in the barrel body. A main shaft is rotationally connected to the interior of the barrel body, the driving motor is fixedly connected to the top of the barrel body, a mixing cover fixedly connected to the main shaft is arranged at the top of the barrel body corresponding to an outlet of the discharging cavity, and a spoiler fixedly connected to the main shaft is arranged in the middle of the barrel body corresponding to the outer edge of the mixing cover; a stirring arm fixedly connected to the main shaft is arranged at the position, corresponding to the ventilation net, of the bottom of the barrel body. The mixing cover, the spoiler and the stirring arm are arranged in the barrel body to mix the plastic particles, so that the plastic particles can be mixed when falling from the discharge hole in the bottom of the storage cavity, and compared with an existing mixing mode, the stirring and mixing time of the plastic particles in the barrel is shortened.