69results about How to "Avoid frictional contact" patented technology

A double pipe type heat exchanger includes an inner pipe having a first flow path defined therein and an outer pipe arranged around the inner pipe to define a second flow path between the inner pipe and the outer pipe. The inner pipe includes a spiral groove formed on an outer circumferential surface of the inner pipe to extend along a longitudinal direction of the inner pipe. The outer pipe includes a reduced diameter portion protruding inwardly so that the inner surface of the outer pipe is intermittently contacted with the outer circumferential surface of the inner pipe.

In one aspect, a modular link conveyor chain including slats is capable of assuming a compressed and an expanded condition so as to permit side-flexing while moving along a forward run and a return run in an endless path. The chain is formed of links arranged in rows spaced apart in the conveying direction, the links of a first row including aligned apertures and the links of a second row including oversized apertures, such as slots, for aligning with the aligned apertures of the links in the first row. A first connector is associated with the corresponding apertures to interconnect the first and second rows of links. At least one elongated slat is mounted to the connector. The slat maybe mounted for pivoting movement between a first position forming at least part of a conveying surface along the forward run, and a second position along the return run.

An escalator with steps having a tread surface and riser surface has riser brushes arranged at the riser surface. The riser brushes provide a barrier for the gap which is normally present between the tread surface of a first step and the riser surface of an adjacent step. The riser brushes may be mounted to a brush strip which is guided along the riser as the steps transfer between vertical and horizontal travel.

In one aspect, a modular link conveyor chain including slats is capable of assuming a compressed and an expanded condition so as to permit side-flexing while moving along a forward run and a return run in an endless path. The chain is formed of links arranged in rows spaced apart in the conveying direction, the links of a first row including aligned apertures and the links of a second row including oversized apertures, such as slots, for aligning with the aligned apertures of the links in the first row. A first connector is associated with the corresponding apertures to interconnect the first and second rows of links. At least one elongated slat is mounted to the connector. The slat maybe mounted for pivoting movement between a first position forming at least part of a conveying surface along the forward run, and a second position along the return run.

The invention discloses three-dimensional (3D) glass and a preparation method thereof. The method comprises the following steps: step 1, placing flat glass with a reserved allowance into a die; step 2, attaching and forming the flat glass on the upper surface of a female die of the die by adopting a heat adsorption process to obtain a 3D glass blank; step 3, cutting the 3D glass blank to obtain a 3D glass semi-finished product; step 4, carrying out computer-numerical-control (CNC) carving, grinding and chamfering on the 3D glass semi-finished product to obtain a 3D glass raw material; and step 5, carrying out shining treatment on the surface of the 3D glass raw material to obtain the 3D glass with a side wall part, a bending part and a window part. According to the invention, the yield of 3D glass production can be improved to be close to 100%, and the problem that in a process that the size of flat glass is pre-designed and then hot press forming and carving are carried out in a conventional 3D glass manufacturing method, the size of formed 3D glass is unqualified due to the fact that a placement position is deviated or the forming pressure is not uniform during hot-pressing molding is solved.

A valve for the gastight interruption of a flow path is disclosed. A valve housing (1) includes a first opening (3) and a valve seat (5). A valve disk (8) includes an outer disk portion (9) and an inner disk portion (11), which is linearly movable relative to an outer disk portion so that, in a closed setting (C), a pressure differential acts substantially upon the movable inner disk portion (11), which is supported on the valve housing (1). The valve seat (5) has a radially inward pointing first inner face (14) and the outer disk portion (9) has a radially outward pointing first outer face (15), wherein in the closed setting (C) there exists a radial sealing contact with the first inner face (14). The outer disk portion has a radially inward pointing second inner face (16) and the inner disk portion has a radially outward pointing second outer face (17), having a radially sealing contact with the second inner face.

An eccentric bush assembly structure of a scroll compressor, in which an orbiting scroll is eccentrically coupled to a rotary shaft of a drive motor, including a bush body rotatably coupled to the orbiting scroll while being pinned to the rotary shaft of the drive motor by an eccentric shaft, the bush body having a friction prevention groove formed in a surface facing a tip surface of the rotary shaft so as not to come into frictional contact with the tip surface.

The invention discloses an airtight door closed running method and an airtight door closed running device. The method comprises the following steps of: arranging a front lifting wheel an a rear lifting wheel on an airtight door; running the front lifting wheel and the rear lifting wheel on respective door rails consisting of double rails respectively, wherein each door rail consisting of double rails is provided with a parallel guide section and a closed guide section respectively; when the lifting wheels run to a position to be closed, feeding the lifting wheels into the closed guide sections of the door rails; simultaneously guiding the lifting wheels inwards and downwards by the door rails of the closed guide sections for stable closed running of the airtight door; contrarily, simultaneously guiding the lifting wheels outwards and upwards by the closed guide sections of the door rails during opening of the airtight door for stable opening of the airtight door; then guiding the lifting wheels by the parallel guide sections of the door rails in parallel; and opening the airtight door. According to the airtight door closed running method provided by the invention, stable separation or closing of the airtight door and wall as well as ground can be guaranteed during opening or closing, frictional contact of a sealing strip is avoided, and the service life is prolonged.

The method involves detecting a slip factor based on a rotational speed of a driven wheel, and detecting the motor torque, where the slip factor is detected as an alteration of pedal rotation speed over a turning rate sensor at the driven wheel. A pedal rotational torque is detected (130), and a drive unit is controlled based on the detected slip factor. A sum of the motor torque and the pedal rotational torque is controlled based on the detected slip factor. The slip factor is compared with a threshold value, and a slippage state of the driven wheel is determined based on the comparison. Independent claims are also included for the following: (1) a control device for a pedal-driven vehicle (2) a pedal-driven vehicle.

The invention provides a waterway switching structure. A body is provided with a water inlet, a first water outlet and a second water outlet. A switching operation piece and a switching piece are arranged in a linkage mode, and the switching piece is sequentially provided with a first pressure relief piece, a linkage piece and a second pressure relief piece in the moving direction of the switchingpiece. A water distribution piece is arranged in the body and provided with two independent water distribution cavities, the two water distribution cavities are arranged up and down in the moving direction of the switching piece, and each water distribution cavity comprises a water inlet cavity communicated with the water inlet and a water outlet cavity communicated with the first water outlet orthe second water outlet; an upper sealing piece and a lower sealing piece are correspondingly arranged in the upper water distribution cavity and the lower water distribution cavity respectively, theupper sealing piece and the lower sealing piece further form a pressure forming cavity in the upper water distribution cavity and the lower water distribution cavity, and the pressure forming cavityis provided with a normal opening communicated with the water inlet. According to the waterway switching structure provided by the invention, the force required for switching is relatively light, andthe switching hand feeling is good.