33results about How to "Flexibility to increase or decrease the quantity" patented technology

The invention provides a modular combined cabinet freezer, and belongs to the field of freezing and refrigerating equipment study. The modular combined cabinet freezer comprises a host module (1), a cabinet dividing module and a connecting component. The host module (1) and the cabinet dividing module (2) of different numbers can be combined to change the size of freezing space, and different application needs are met. Compared with the prior art, the modular combined cabinet freezer has the beneficial effects that a user can flexibly increase and reduce the number of the modules according toactual space needs and function needs, the use efficiency of the cabinet freezer can be fully improved, and energy is saved.

The invention provides a method for managing access points (AP), an access controller (AC) and an access point (AP), wherein the method comprises the following steps: determining whether the activation condition or the sleep condition of AP is met or not by the AC, and informing the AP to enter a running state from a sleep state when the activation condition of the AP is met; and informing the AP to enter the sleep state from the running state when the sleep condition of the AP is met and keeping connection with the AC when the AP is in the sleep state but not providing access service for any user terminal. The invention can flexibly increase or decrease the number of the AP which provides access service as required, reduce the power consumption and avoid the energy waste.

The invention relates to a phase change heat storage device, a solar heat utilization system employing the same and an operating mode of the solar heat utilization system, and provides a heat storage device with good heat storage property and high exergy, and the heat storage device is applied to a solar heat utilization system. The heat storage device adopts a plurality of serially connected independent heat storage units to realize temperature gradient heat storage and utilizes latent heat of a heat storage medium during heat storage to improve the heat storage effect and the heat utilization ratio, is simple in structure and allows the heat storage units to be flexibly adjusted as required. According to the invention, the heat storage device is also applied to the solar heat utilization system, latent heat and sensible heat storage capability of the heat storage medium are fully utilized, the required amount of the heat storage medium is reduced, the structure is simplified and the solar exergy is improved.

The invention discloses a high-precision multi-station fiber time synchronization method, and the method comprises the steps that 1), a source end transmitting station and a tail end receiving station carry out the bidirectional time comparison; 2), receiving stations along a way regenerates synchronized time signals. The above two processes are carried out at the same time. According to the invention, the source end transmitting station and the tail end receiving station just need to carry out the continuous bidirectional time comparison, and the receiving stations along a way just receive bidirectional time comparison signals from the source end transmitting station and the tail end receiving station, regenerate the time signals synchronous with the source end transmitting station, and do not need to participate in the bidirectional time comparison. The method can achieve the same synchronization precision and reliability of multi-station fiber time synchronization and point-to-point fiber time synchronization, and the receiving stations along the way do not interfere with each other, wherein the number can change flexibly.

The invention discloses a brushless excitation black excitation circuit. The brushless excitation black excitation circuit is applied to a non-auxiliary-power remote hydropower station or a movable diesel generating set, and under the condition that no external power supplies are provided, the automatic black excitation of a brushless excitation generating set is realized. The brushless excitation black excitation circuit comprises a voltage setting unit, a power tube array unit, a power tube driving unit and an optical coupler. The voltage setting unit comprises a short-range voltage setting variable resistor and a remote voltage setting variable resistor. According to the invention, a large power power tube parallel connection technology is adopted, the working state is started and stopped at a high speed, no mechanical contacts exist, and the reliability is high; in addition, according to the magnitude of the excitation current of the generating set, the number of the power tube can be increased or decreased flexibly. The brushless excitation black excitation circuit provided by the invention has an over-current protection function. When the excitation current is detected to be larger than a setting value, a protection circuit acts immediately, the output of power tubes is stopped, and the generating set is effectively protected against an excitation over-current and over-voltage.