8results about How to "Reduce work loss" patented technology

The utility model provides a kind of three-dimensional printing automatic change board receiving device, including box, multiple flap plates that can be turned into oblique parallel shape are hingedly installed in the box, placing groove is opened in the flap plate, and the flap plate of innermost side is connected with the linkage pull rope between the side wall of opposite box and adjacent flap plate, and the adjacent flap plate between oblique parallel shape is provided with the partition space for placing the printing plate loaded with part.The utility model is slid into the box by the printing plate with part, and multiple flap plates are linked to turn over by pressing linkage pull rope, and the partition space between adjacent flap plate after turning over oblique parallel shape is convenient to store another printing plate bearing part replaced, so that part is orderly stored in receiving process, reduce subsequent collation cumbersome work and time loss, effectively avoid part and printing plate to suffer damage in replacement process.

This invention relates to the field of fire-fighting equipment, and in particular to an automatic tracking and positioning jet fire extinguishing device, comprising an automatic fire extinguishing device and a water pipe. The water pipe is vertically positioned at the top of the automatic fire extinguishing device, and a slip ring mechanism is provided between the top of the automatic fire extinguishing device housing and the water pipe. The slip ring mechanism includes a disc and a flange that fits onto the disc. A first silicone ring and a second silicone ring are fitted between the peripheral wall of the disc and the inner wall of the flange. A first electrode strip and a second electrode strip are fitted between the first and second silicone rings. This slip ring mechanism of the automatic tracking and positioning jet fire extinguishing device uses cylindrical electrode columns instead of traditional electrode contacts in the form of rollers. By controlling the gap during assembly and elastically compressing the rollers, reliable contact pressure is achieved, and sufficient conductive area is obtained. This transforms the sliding friction of traditional electrical slip rings into rolling friction, reducing working wear and extending service life.

The application is suitable for the technical field of gas heating water heater, and provides a gas heating water heater capable of automatically processing gas leakage, which comprises a water heater body, a gas cut-off valve and an explosion-proof fan; the water heater body comprises a control panel, a gas leakage alarm, a water heater controller and a water heater electromagnetic valve; the water heater electromagnetic valve is arranged on an internal gas pipe, and the gas cut-off valve is arranged on an indoor gas pipe; the control panel is electrically connected with the gas leakage alarm, the controller and the explosion-proof fan respectively, and is wirelessly connected with the gas cut-off valve; the water heater controller is electrically connected with the water heater electromagnetic valve. The application controls the gas cut-off valve in a wireless mode through the control panel, can close the indoor gas pipe when gas leakage occurs, cuts off the gas from the source, and simultaneously closes the electromagnetic valve and the gas proportional valve in the gas heating water heater through the controller, so that the gas leakage of the water heater itself pipe and the gas leakage of the indoor pipe are effectively and comprehensively terminated.

The utility model discloses an energy -conserving hydraulic system based on energy storage device, including hydraulic pump, check valve, energy storage device, pressure detection device, reversing valve device, hydraulic cylinder, first high pressure oil circuit, second high pressure oil circuit and PLC controller, the oil inlet end of hydraulic pump is connected with oil tank, the oil outlet end of hydraulic pump and the import end of check valve all are connected with first high pressure oil circuit, the export end of check valve, energy storage device and the oil inlet end of reversing valve device all are connected with second high pressure oil circuit, the output end of reversing valve device is connected with hydraulic cylinder, pressure detection device sets up in energy storage device inside. In the utility model, the energy storage device can store the oil pressure of the superfluous high pressure oil circuit, and the energy is released when necessary to compensate the pressure in the high pressure oil circuit, so that the intermittent working mode can be used to the hydraulic pump, to reduce the energy consumption and the working loss of equipment, reduce production cost.

The invention provides a semiconductor device structure and a preparation method thereof. The semiconductor device structure comprises a first conductive type back surface layer, a trench gate and a deep trench field plate, wherein the first conductive type back surface layer is composed of a first conductive type buffer layer and a first conductive type follow current heavily doped region below the deep trench field plate; the trench gate penetrates through a second conductive type body region and extends into a first conductive type substrate layer; and the depth of the trench gate penetrating through the first conductive type heavily doped region is smaller than that of the deep trench field plate. The deep trench field plates in short circuit with the emitter electrode are arranged on the two sides of the trench gate, so that a large number of holes can be accumulated when the deep trench field plates are conducted, and the conduction voltage drop is reduced; meanwhile, the vertical electric field distribution is added into the deep trench field plate to optimize the compromise relation between the FRD breakdown voltage and the break-over voltage in the RC-IGBT, so that the working loss of the RC-IGBT in the follow current state is reduced; besides, carriers in a depletion layer can be rapidly extracted in a follow current state in cooperation with a deep trench field plate, so that the current released during reverse recovery is reduced, and the peak current of reverse recovery is reduced.

The present invention discloses a reciprocating transition circuit and voltage regulation method for an on-load tap changer, the circuit comprising: a first main through-current switch, a second main through-current switch, a first switch element, a second switch element, a third switch element, a fourth switch element, a first transition resistor and a second transition resistor; the second end of the first switch element, the first end of the second switch element and the first end of the first transition resistor are connected; the second end of the third switch element, the first end of the fourth switch element and the first end of the second transition resistor are connected; the second end of the first main through-current switch, the second end of the second switch element, the second end of the first transition resistor, the second end of the second main through-current switch, the second end of the fourth switch element and the second end of the second transition resistor are all used to connect to the neutral point lead-out terminal of the on-load tap changer. The present invention realizes on-load switching and voltage regulation entirely by switch elements and transition resistors; and no mechanical track-changing mechanism is required.

The application provides a semiconductor device structure and a preparation method thereof. The semiconductor device structure comprises a back layer of a first conductive type which is composed of a buffer layer of the first conductive type and a freewheeling heavy doped region of the first conductive type under the deep trench field plate, a trench gate and a deep trench field plate which penetrate a body region of a second conductive type and extend into a substrate layer of the first conductive type; and the trench gate which also penetrates the heavy doped region of the first conductive type has a depth smaller than that of the deep trench field plate. The deep trench field plate which is short-circuited with the emitter and arranged on both sides of the trench gate can accumulate a large number of holes when the deep trench field plate is turned on, so that the on-state voltage drop is reduced. Meanwhile, the deep trench field plate optimizes the compromise relationship between the FRD breakdown voltage and the on-state voltage in the RC-IGBT with a vertical electric field distribution, so that the working loss of the RC-IGBT in the freewheeling state is reduced. In addition, the deep trench field plate can quickly extract the carriers in the depletion layer in the freewheeling state, so that the current released in the reverse recovery is reduced, and the peak current in the reverse recovery is reduced.

This invention provides a rotor blade profile for a liquid ring pump, the shape of which is determined by the coordinates of an involute equation, wherein the equation is: , ; where, X The x-axis is... Y The vertical axis represents the blade profile. X , Y A segment of a curve formed by continuous changes; the radius of the outer circle of the impeller hub. D The diameter of the impeller. t Let π be the independent variable and π be the value of a circle. b This is an eccentric quantity. Its range of values ​​is... D The value range is 0.2 to 0.3 times; t The value range is 0 to 1; b The value range of is 0 to 1 times the value range of . This invention has many advantages, such as good overall performance, low working loss, high working efficiency, low vibration, low noise, and low cavitation risk.