4results about How to "Multiple contact areas" patented technology

The application discloses a preparation method of a high-peeling-strength inner support polyvinylidene fluoride hollow fiber membrane, and comprises the following steps: (1) mixing polyvinylidene fluoride, a hydrophilic pore-forming agent and an organic solvent to obtain a casting solution; (2) coating the casting solution on a modified support tube through a spinning nozzle, then walking vertically downward in the air, and then entering a coagulation bath to be coagulated and formed into a formed piece; and (3) soaking the formed piece obtained in the step (2) in pure water, then placing the formed piece in a mixed liquid of water and glycerol, and then drying to obtain the high-peeling-strength inner support polyvinylidene fluoride hollow fiber membrane. The anti-hook type support tube prepared by using the anti-hook technology has an increased roughness of the surface of the support tube, the casting solution and the support tube can have more contact areas, the adhesion between the membrane layer and the support tube is greatly improved, and the peeling and peeling-off of the membrane layer caused by washing during the operation of a membrane module can be effectively reduced.

The utility model discloses a kind of efficient energy-saving electric heating pipes, the device includes: pipe body, the pipe body one end is equipped with end cap, the end cap one end is equipped with two lead wires, the pipe body sequentially includes base layer, oxidation resistance layer, reflective heat insulation layer from inside to outside, the base layer inner wall is equipped with evenly distributed heat dissipation rib. The utility model has the advantages that: pipe body is sequentially set base layer, oxidation resistance layer and reflective heat insulation layer from inside to outside, reflective heat insulation layer is like a layer of "heat shield", can efficiently reflect the heat radiated outward in pipe body interior, heat is "intercepted" in pipe, reduce the dissipation of heat to surrounding environment, so that more heat can be concentrated for heating target object;Base layer inner wall is provided with the heat dissipation rib that is distributed in helical shape, this unique helical structure increases the surface area of base layer inner wall, provides more passageway and contact area for heat transfer, effectively reduces energy consumption, meets the environmental protection requirement of energy saving and emission reduction currently.

This utility model belongs to the technical field of hydraulic components and discloses a relief valve for a walking motor, including a valve body and a plug fixedly connected to the end of the valve body. A sealing groove is formed between the outer peripheral wall of the plug and the inner peripheral wall of the valve body, and a sealing ring is installed in the sealing groove. The inner peripheral wall of the valve body includes a first wall and a second wall. The sealing ring abuts against the first wall, and the plug is fixedly connected to the second wall. The first wall has a first end away from the second wall and a second end close to the second wall along the axial direction. The vertical distance from the first end to the axis is denoted as L1, and the vertical distance from the second end to the axis is denoted as L2, where L1 is greater than L2. Under the same compression, the sealing ring of the relief valve of this utility model has a smaller effective contact area on the side of the sealing ring closer to the second end, which reduces the risk of the sealing ring detaching away from the second end due to the force. At the same time, it can also improve the sealing performance after the sealing ring is matched with the valve body and the plug to a certain extent.