42 results about "Pressure phases" patented technology

The invention relates to a method for operating an injection-moulding machine, having at least one plasticization device (2, 3) with at least one plasticization screw (3) which can be driven in rotation about a screw longitudinal axis (5) and so as to be movable in translation along the screw longitudinal axis (5), wherein, by way of the plasticization device (2, 3), a plastics melt (14) for injection into a mould cavity is provided in a screw antechamber (9), wherein, for the injection of the plastics melt (14) into the mould cavity, that is to say at least during an injection phase and during a follow-up pressure phase, the plasticization screw (3) is driven both in translation and in rotation by way of at least one drive device, wherein the driving of the plasticization screw (3) in rotation is performed with a rotational speed (nscr) such that a backflow (mdruck) of the melt from the screw antechamber (9) back into screw flights (71) of the plasticization screw (3) owing to a translational injection movement of the plasticization screw (3) has superposed on it an opposing delivery flow (mschlepp) effected by way of the rotation of the plasticization screw (3), wherein a flow difference (m[delta]) between backflow (mdruck) and opposing delivery flow (mschlepp) arises, and the flow difference (m[delta]) is, at least during the injection phase, influenced by influencing of therotational speed (nscr) of the plasticization screw (3), and the method is performed without using a backflow preventer.

The present invention discloses a superfluid gyroscope apparatus based on pressure phase shift assisting, and belongs to the technical field of high precision gyroscopes. The superfluid gyroscope apparatus comprises a pressure phase shift assisted superfluid interferometer, a temperature control system, a thermal driving system, a thin film displacement detection system and an amplitude value locking system. According to the present invention, according to the pressure phase shift production principle, the pressure phase shift assisted superfluid interferometer is designed so as to effectively reduce the dynamic measurement error of the superfluid gyroscope and improve the measurement precision of the superfluid gyroscope.

The invention relates to a closed-loop expectoration method for automatically titrating the pressure of expectoration, comprising S1, setting the reference value C2 of the user's negative pressure phase flow-volume ring area F-V ring area; S2, calculating the user's The actual value R2 of the negative pressure phase F-V ring area; S3, compare the reference value C2 of the negative pressure phase F-V ring area, and the actual value R2 of the negative pressure phase flow-volume ring area to adjust the negative phase pressure E-P and / or normal phase pressure I‑P. The present invention also proposes a closed-loop expectoration system for automatically titrating the pressure of expectoration, including: a reference value setting module, which sets the reference value C2 of the negative pressure phase flow-volume ring area F-V ring area; the actual value calculation module , monitor and calculate the actual value R2 of the negative pressure phase F-V ring area; the comparison module compares the reference value C2 and the actual value R2; the adjustment module adjusts the negative phase pressure E-P and the positive phase based on the results of the comparison module Pressure I‑P. The expectoration method and system of the present invention ensure safer and more effective expectoration.

The invention relates to a breast pad and a production method thereof, which comprises: a water-conducting layer, a water-absorbing layer and a waterproof layer stacked in sequence, and elastically shrinkable rubber bands symmetrically arranged on both sides of the breast pad, and the four sides of the breast pad are respectively There is a heat-synthesized crimping line; the adjacent ends of the two crimping lines adjacent to each end are distributed alternately, and aligned up and down, or the adjacent ends of the two crimping lines can be projected on each other's crimping lines . When the breast pad of the present invention is in use, if the water-absorbing layer is saturated, the upper and lower sides of the two adjacent ends of the two adjacent pressure lines are alternately aligned due to the heat-synthesized sections around the breast pad. , or the adjacent ends of the two pressure lines can be projected on each other’s pressure lines. Compared with the prior art, this application changes the straight channel into a curved channel, so that the liquid and the polymer water-absorbing powder in the water-absorbing layer cannot be directly Leaking outward, and due to the surface tension of the liquid itself, the liquid cannot smoothly pass through the curved channel with a small diameter, thus preventing the liquid from leaking outward.

The invention relates to polyethylene tube test techniques and is intended to provide a tightness test and evaluation method for high-density polyethylene tubes for nuclear power stations, comprising:injecting an HDPE (high-density polyethylene) tube fully with water through a water pump, and increasing the pressure continuously to a test pressure at the controlled pressure increase rate range of40-120 kPa / min; holding the pressure for 4 h, and supplementing water so that the pressure in the tube is maintained to the test pressure; stabilizing the pressure for 1 h, recording pressure data, and drawing a pressure change curve graph; acquiring an actual pressure drop of tightness test according to a ratio of a pressure difference of start and end moments of a stabilized pressure phase to the test pressure; when the actual pressure drop is less than an allowable pressure drop, considering that the tightness test for the HDPE tube is qualified. The method has the advantages that tightness test for the HDPE tube quits using test standards or methods for steel tubes or tubes of other fixed material and structure, and however, a specific acceptance standard for tightness test is made according to the specific tube material and structure and test environments.