A system for controlling operation of first and second electric fans is provided. The system includes a microcontroller that determines when first analog multiplexer is malfunctioning or a first channel of the first analog-to-digital converter is malfunctioning based on first values obtained from the first analog-to-digital converter. The first values are associated with at least one of a first speed signal associated with the first electric fan and a first driving voltage for the first electric fan that are received by the first analog multiplexer. The microcontroller modifies a control signal to induce the second electric fan to operate at a higher rotational speed when the first analog multiplexer is malfunctioning or the first channel of the first analog-to-digital converter is malfunctioning.

A fan arrangement has a plurality of fans arranged in parallel to each other and configured to generate airflow along a common main flow direction. A flow channel is assigned to each fan, and a respective flow channel has a flap that can be swiveled between an open position and a closed position. The flap is constructed and positioned within the flow channel in such a way that it is supported by the airflow in the open position and brought into the closed position by a reverse flow opposing the airflow. This arrangement reliably prevents a fluidic short circuit in the event of failure of individual fans, and ensures natural draft convection in the event of failure of all fans. The flap is constructed in such a way that it is brought into the open position when no air is flowing due to its intrinsic weight.

A multichannel air assembly (1000) for use with inflatable products with multiple inflatable chambers (C). Specifically, said multi-channel air assembly (1000) may be used to selectively inflate or deflate one or more chambers (C) of an inflatable product to varying pressures.

Centrifugal compressors can incorporate a side stream flow of intermediate pressure vapor between stages of that compressor. The side stream flow can be controlled by a side stream injection port controlled by a capacity control valve that has a curved surface facing a flow of refrigerant from the first stage to the second stage. The capacity control valve can allow or obstruct flow through the side stream injection port. The capacity control valve can extend and retract in a direction substantially perpendicular to the direction of flow from the first stage impeller to the second stage impeller. The side stream injection port and the capacity control valve can be ring-shaped. The side stream injection port and the capacity control valve can allow at least some of the side stream to be introduced on a side of the capacity control valve opposite the curved surface.

Disclosed herein are embodiments of magnetically controlled valve and pump systems that can be used to control and facilitate fluid flow in fluidic devices. Various types of magnetically controlled valves and pumps are described as well as methods of magnetically-controlling such valves and pumps.

An air pump comprises a controller, a pump, a driving switch and a pressure sensor. The controller includes a central processing unit and defines an air inlet. The pump couples to the controller to inflate or discharge air from an inflatable body. The pump comprises a housing defining an inflating and a discharging port. The driving switch couples to the controller to implement switching between two or more air passage configurations. The pressure sensor couples to the central process unit to detect an internal pressure value of the inflatable body. The controller includes a wireless communication module which communicates with the central processing unit and a mobile terminal. The mobile terminal includes a terminal wireless communication module and a terminal input unit. The terminal wireless communication module communicates with the wireless communication module. The terminal input unit provides at least an inflation, a deflation, or a stop signal input.

A method for controlling a compressor system comprising a plurality of compressors, wherein the compressor system is intended to maintain a predefined excess pressure in a pressurized fluid system, wherein decisions are met at fixed or variable intervals as to switching operations for adapting the system to current conditions, wherein —in a pre-selecting step, switching alternatives are excluded from the plurality of combinatorially available switching alternatives, —in a main selecting step, remaining switching alternatives are weighed against one another while referring to one or more optimization criterion (criteria) and optimum switching alternatives are selected from among the given criteria, and —in a control step, the selected switching alternative is output for implementation in the compressor system.

The present disclosure provides an electric air pump which includes: a first housing including a cavity; a first air pump arranged inside the cavity, the first air pump being provided with a fan blade cover that divides the cavity into a fan blade cavity and a driving cavity; a switch driving device arranged inside the driving cavity, connected to the first air pump, and adapted to drive a switching between air passages; an air pressure sensor arranged inside the driving cavity for detecting an internal pressure value of an inflatable body; a central control unit arranged inside the driving cavity and electrically connected to the first air pump, the switch driving device, and the air pressure sensor; and at least one panel covering the cavity opening of the cavity. The electric air pump can precisely control an inflation pressure, and automatically and silently supplement air via an air supplement pump.

A fan characterization and control system includes a chassis housing a plurality of components and a fan system. A controller system is coupled to the components and the fan system and configured to detect fan devices in the fan system that are connected to the controller system via respective fan connectors. The controller system determines fan performance categories of each of the fan devices based on signals communicated by each of the fan devices through at least one pin on the respective fan connectors. The controller system accesses a fan performance database that stores different fan performance categories and respective fan performance characteristics for each of the different fan performance categories. The controller system uses fan performance information that is associated in the fan performance database with each of the fan performance categories determined for the fan devices to configure the components and the fan system for operation.

A system of fans ventilates heated air from within an IHS (Information Handling System), such as a rack-mounted server, when operated during normal conditions at a rated fan speed. A controller detects a failure of a fan of this fan system and identifies the functioning fans of the system. One or more of the functioning fans are selected for boosting by operation of a fan failure compensation circuit that has been configured for delivery of additional power to the selected boost fans. The fan failure compensation circuit delivers an output voltage that boost the airflow output of the system to compensate for the failed fan. By increasing the output voltage by approximately twenty percent, the boosted fans operate at approximately fifteen percent above rated speeds, which has been demonstrated to compensate for a failed fan while avoiding further failures during the expected lifespan of the fan system.