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A motor pump 1, for drawing water from a supply reservoir B to be sprayed over a plot of land by means of an irrigation system I, comprising a pumping unit 2 having a motor 3, a pump 4, driven by the motor 3, and a drawing tube 5, movable and insertable by immersion into the supply reservoir B to draw water and introduce it under pressure, as a result of the action of the pump 4, into the irrigation system I.The motor pump further comprises a first frame 6 having a supporting base 7 having the pumping unit 2 on board at the top, and a second frame 8 having a pair of wheels 9 at the bottom to allow movements of the second frame 8 over the ground, said second frame 8 being reversibly movable, under the action of movement means 10, from an engagement position, in which the first frame 6 is raised on board the second frame 8 so as to render the two frames 6,8 solidly joined and transportable by means of the pair of wheels 9, to a disengagement position, in which the first frame 6 is disconnected from the second frame 8 so as to allow a separation of the second frame 8 from the first frame 6, leaving the latter with the supporting base 7 resting on the ground.

[Problem] To improve the pump system so that lower pressures can be achieved. [Solution] A pump system comprising a turbomolecular vacuum pump 300, wherein the turbomolecular vacuum pump comprises a housing 302 having pump intake ports 304, 306, 308 and a pump exhaust port 310; a first pump mechanism having turbomolecular pump stages 314, 316, 318; and a second pump mechanism operating according to a different pumping principle than that of the first pump mechanism, wherein the first and second pump mechanisms are arranged along a rotor shaft and are located axially between at least one pump intake port and a pump exhaust port, and the pump system comprises at least one electrically operated cooling device 326, 332 for cooling the housing, wherein the cooling device is located axially with respect to the second pump mechanism on the side of the second pump mechanism facing the first pump mechanism. [Selected Figure] Figure 6

本发明公开了一种压气站空压机的故障诊断方法、装置、设备和存储介质。该方法包括：基于历史维护信息生成在不同空压机类型下所对应的参数模拟运行曲线，并在参数模拟运行曲线中确定对应的故障时间节点；基于故障时间节点和第一曲线截取窗口，以进行构建空压机历史故障运行曲线库；基于故障时间节点和空压机历史环境信息生成空压机对应的历史环境曲线并构建空压机历史环境曲线库，由此构建故障曲线模版；将所采集的实时环境数据和实时运行数据生成空压机对应的实时环境曲线和实时运行曲线，基于实时环境曲线、实时运行曲线以及故障曲线模板对空压机的运行进行故障诊断。上述技术方案，能够提高压气站空压机的可靠性和运行工作效率。

Ein Verfahren dient zum Betrieb eines Ventilators, insbesondere eines Axial- oder Diagonalventilators, wobei der Ventilator einen elektrischen Antrieb mit mindestens einem dem Antrieb zugeordneten Laufrad umfasst, von dem im Betrieb zumindest primäre Motorsensorgrößen erfasst und zur quantitativen Bestimmung des jeweils aktuellen Betriebszustands verarbeitet werden. Ein Ventilator nutzt ein entsprechendes Verfahren.

This screw compressor comprises: a pair of screw rotors including a first rotor and a second rotor that mesh with each other, the second rotor having a smaller diameter than does the first rotor; a casing having a bore which accommodates the first rotor and the second rotor; and a slide valve that is provided inside the casing, partially has a cylindrical shape, and has a variable position in the axial direction so as to make it possible to adjust volume. In a first direction connecting a center O1 of a first circle, which includes an arc corresponding to the outer diameter of the first rotor in the outline of the bore, and a center O2 of a second circle, which includes an arc corresponding to the outer diameter of the second rotor in said outline in a cross-section which is perpendicular to said axial direction in this screw compressor, a center O3 of a third circle including an arc forming the outline of the slide valve is located on the second-circle-center O2 side relative to a cusp point A, which is an intersection of the first circle and the second circle.

A method for determining a flow volume of a fluid delivered by a pump. The flow volume is determined as a function of predefined pump information depending on a pump geometry, rotation speed information, which correlates with the rotation speed of the pump, and pressure information, which correlates with a differential pressure at the pump.

An electric oil pump (100), comprising: a motor assembly (10); a gear pump assembly (20), the gear pump assembly (20) being driven by the motor assembly (10) and being configured for pumping oil into the electric oil pump (100); and an electronic control assembly (30), comprising a busbar (31) and a temperature sensor (32), wherein in an axial direction of the electric oil pump (100), the busbar (31) is located between the motor assembly (10) and the gear pump assembly (20), and the temperature sensor (32) is disposed on a side of the busbar (31) close to the gear pump assembly (20) and is configured for measuring an oil temperature of the oil pumped into the electric oil pump (100) by the gear pump assembly (20).

本发明公开了一种机械密封结构，旨在提供一种密封的效果好，能够防止泵内介质泄漏，在运行过程中具有较好安全性的一种单螺杆泵水润滑双端面密封结构及其安装方法，其技术方案要点是通过将密封座安装于单螺杆泵的轴承座与星轮架之间，减小了整体的占用空间，整体密封结构能够直接嵌入安装机体内部，提高了设备改造的适配性以及整体结构的紧凑性，且密封座直接嵌入安装机体内部，使得密封结构在运行过程中产生的摩擦热量能够通过密封座与安装机体实现快速散热，同时送液环向填充腔内部输入压力可控的隔离介质，从而在动环结构与静环结构之间形成液膜屏障，实现对于泵体内部介质的隔离密封，本发明适用于泵体密封技术领域。