40results about How to "Ensure normal working life" patented technology

The invention discloses an extraction separator and a manufacturing method thereof. When the extraction separator is manufactured, an air flow guide pipe is arranged at a process fluid inlet of the extraction separator, and process fluid enters in an inner cavity of a high-pressure kettle body of the extraction separator through the air flow guide pipe; then the flow direction of the process fluid is changed, and the process fluid flows along the peripheral direction of the inner cavity of the high-pressure kettle body and sprayed out of the air flow guide pipe along the tangential direction of the circumference. The invention thoroughly changes the flow direction of the high-pressure process fluid for entering the extraction separator, effectively avoids the blowing to the stored products at the bottom of the extraction separator of an axial air entering mode, improves the separating capacity of a supercritical extraction device, ensures the normal service life of each component in the supercritical extraction device, keeps the due extraction capacity of the process fluid and has the advantages of good separating effect, low operating cost and high working efficiency.

The present invention provides a grid-connected inverter control method and system based on grid-connected asymmetrical faults, controlling the grid-connected inverter connected between the new energy module and the grid, including: The parameter limit value of safe power transmission by the grid, including the limit value of active power fluctuation range and the maximum phase current limit value; according to the type of fault and the degree of drop, the upper limit value of active power output of the grid-connected inverter and the positive and negative The proportion of the active power of the grid-connected inverter; the PI adjustment of the DC bus voltage of the grid-connected inverter and its reference value to obtain the active power reference; the reference value of the output current of the grid-connected inverter is determined according to the proportion of the active power reference and the positive-sequence active power ; Drive the grid-connected inverter to output current according to the current reference value. The method and system can ensure the safe operation of the grid-connected inverter in the case of an asymmetric fault of the grid, and ensure the normal operation and service life of the grid-connected converter.

The invention relates to a split combined type plastic hanger. A main body is formed by plastic supports and plastic hooks, T-type hanging rods formed by connecting vertical rod with outwards-protruding clamping heads, the plastic hooks are provided with straight-shaped hanging ends with closed type hanging holes and horizontal hanging and holding ends with horizontal step-shaped counter holes and vertical guide grooves, and a split type is formed by mating and buckling the two split components including the plastic supports and the plastic hooks. When the split combined type plastic hanger is used, the hooks are movably arranged on a clothes hanging transverse rod in a sleeved mode and can move in a left-and-right mode, the plastic supports are buckled at the horizontal hanging and holding ends of the hooks through the outwards-protruding clamping heads and can be disassembled at random, the vertical rods can be retracted from or extended into the vertical guide grooves, to enable the supports to be separated from or buckled with the hooks only by upwards lifting the plastic supports to enable the outwards-protruding clamping heads to be higher than the horizontal hanging and holding ends, the outwards-protruding clamping heads are small in size and smooth in surface, resistance influences are small when the outwards-protruding clamping heads are in contact with surrounding clothes, the condition that the surrounding clothes are hooked to be damaged is avoided, and the split combined type plastic hanger is reasonable in structure, safe and reliable in work, convenient to use and long in service life, and has the high practicability and the commendable market application prospect.

The invention discloses a forward feedback type absorption circuit for improving the efficiency of a DC solid-state circuit breaker, which relates to the technical field of power electronics, and includes voltage peak absorption at both ends of a first main power tube and a second main power tube connected in parallel in reverse series respectively. circuit, forward energy storage circuit, reverse energy storage circuit and energy feedback circuit connected in parallel at both ends of the power supply, the first end of the first main power tube is connected to the positive pole of the power supply, the second end of the second main power tube is connected to one end of the load, the load The other end is connected to the negative pole of the power supply, the voltage peak absorption circuit is used to absorb the voltage peak, the forward energy storage circuit and the reverse energy storage circuit are used to store energy when the load is short-circuited, and the energy feedback circuit is used to feed back the stored energy to the power supply. While providing the function of absorbing voltage spikes, the circuit enables the energy to be fed back to the power supply and improves the efficiency of the DC solid-state circuit breaker.

The invention relates to a simple and convenient solar electric car charger which comprises a portable foldable solar photovoltaic panel and a charge control device. A plurality of small solar photovoltaic panels are hinged and mutually connected to form the portable foldable solar photovoltaic panel, a charge output plug is arranged on the portable foldable solar photovoltaic panel, and a direct current voltage stabilizing and overvoltage protection circuit is arranged in the charge control device. When in operation, a charge control board is electrically connected with a storage battery through the charge output plug, and the charge control device can automatically charge the storage battery or cut off charge as needed without manual control under the action of the overvoltage protection circuit when an electric car is in stagnation of movement or on the way of running in a lighting environment. The simple and convenient solar electric car charger effectively overcomes a plurality of troubles caused by frequent charge for an existing electric car with alternating current and electricity depletion of the storage battery on the way of running, the storage battery is used and charged, the normal operation life of the storage battery is ensured, daily mental stress and economic burden of electric car users are effectively relieved, and great use convenience and economy are brought.

The invention provides a comprehensive temperature-control electromagnetic clutch and belongs to the technical field of electromagnetic clutches. The comprehensive temperature-control electromagnetic clutch comprises a cooling assembly and an automatic heat dissipating assembly, wherein the cooling assembly comprises a driving part, a driven part, a temperature-control mechanism and a cooling mechanism; the driving part comprises a belt pulley and an electromagnet; the driven part comprises an armature and a driving shaft; the electromagnet comprises an inner coil and an outer coil; the temperature-control mechanism comprises a first temperature-control switch and a second temperature-control switch; the first temperature-control switch is connected with the outer coil; the second temperature-control switch is connected with the inner coil; the cooling mechanism comprises an air cooling device and a cooling pipe; the air cooling device is connected with the driving shaft; the cooling pipe is arranged in the driving shaft and communicates with the air cooling device; the automatic heat dissipating assembly comprises a heat absorbing device, a heat exhaust pipe arranged above the heat absorbing device, and an air inlet pipe arranged below the heat absorbing device; the heat absorbing device comprises a ring cavity, a plurality of heat absorbing parts arranged on the inner side wall of the ring cavity, and a liquid inlet pipe arranged on one side of the upper part of the ring cavity; and the liquid inlet pipe is equipped with a temperature-control switch. By adoption of the comprehensive temperature-control electromagnetic clutch provided by the invention, other devices can be effectively cooled within a wide range; and meanwhile, the working temperature of the comprehensive temperature-control electromagnetic clutch can be controlled.

The invention provides a safety running control method for a grid-connected current transformer under a power grid fault. The method comprises the following steps of s1, determining a parameter limitation value for safety running of the grid-connected current transformer, wherein the parameter limitation value comprises an active power fluctuation margin limitation value and a phase current limitation value; s2, setting an active power reference value and a reactive power reference value containing a positive-sequence component and a negative-sequence component under a rotating coordinate system, allocating the positive-sequence components and the negative-sequence components of active power and reactive power according to the parameter limitation value, and outputting the active power reference value and the reactive power reference value after allocating; and s3, calculating an output current reference value of the grid-connected current transformer according to the allocated active power reference value and the reactive power reference value containing the positive-sequence component and the negative-sequence component under the rotating coordinate system, and controlling the grid-connected current transformer to output current according to the current reference value. Through the above method, factors such as phase current and power fluctuation are comprehensively considered, the reference current is accurately output and controlled, the safety running of the grid-connected current transformer under the power grid fault can be effectively ensured, the normal working and the service lifetime of the grid-connected current transformer are guaranteed, and an effective support can be formed for a power grid.