8results about How to "Improve jetting accuracy" patented technology

The invention discloses a wafer post-processing device and a post-processing method, and relates to the technical field of semiconductor manufacturing, and the wafer post-processing device comprises a box body; the clamping assembly is arranged in the box body and is used for horizontally clamping and driving the wafer to rotate; the post-processing assembly comprises a spraying head, the spraying head is arranged above the clamping assembly, and the liquid medicine outlet end of the spraying head sprays liquid and / or gas towards the wafer so as to clean the surface of the wafer; the spraying head sprays protective gas towards the wafer so as to form a protective gas curtain above the sprayed liquid medicine, so that mist and particles in the box body are prevented from being in contact with the liquid medicine; the spray header comprises a spray seat, a spray head and a spray head, wherein an accommodating cavity is formed in the spray seat; the core part is arranged in the accommodating cavity; the liquid medicine tube extends downwards through the mounting hole of the core part; a first gap is formed between the liquid medicine tube and the mounting hole, and the protective gas is transmitted downwards through the first gap.

The invention discloses a control method of a high-precision low-carbon fuel injection system device, which comprises the following steps of: S101, establishing a nozzle mode time sequence control logic based on a flow demand and a nozzle number, and associating the flow demand with the correspondingly opened nozzle number; s102, the number of the opened nozzles is determined according to the fuel flow requirement of the fuel engine; and S103, the nozzles with the few opening times are selected to execute the spraying instruction. The method has the advantages of fast response, high precision, good reliability and the like.

The invention discloses an SCR injection control method, relates to the technical field of SCR injection, and solves the technical problem of poor SCR injection amount precision. The method comprises: before installation, determining the injection error of each SCR nozzle, grouping each SCR nozzle according to the injection error, and marking the group number; calibrating the deviation between the target injection amount and the actual injection amount of each group of SCR nozzles, and formulating a deviation compensation table or a deviation compensation curve according to the deviation of each group; during installation, determining the group number of the SCR nozzle according to the group number mark of the installed SCR nozzle, and storing the group number and the deviation compensation table or the deviation compensation curve in an ECU; when the engine is actually working, the ECU calculates the target injection amount according to NOx detection data, and queries the deviation compensation table or the deviation compensation curve according to the group number of the SCR nozzle to obtain the deviation compensation value, the target injection amount plus the deviation compensation value to obtain the final injection amount, and the ECU controls the operation of the SCR system according to the final injection amount.

The invention provides an injection rail pressure correction method and device, electronic equipment and a storage medium, belongs to the technical field of diesel engine fuel system control, and is applied to a high-pressure common rail fuel system which comprises a current working cylinder and a plurality of to-be-working cylinders. The method comprises the steps that a target cylinder, corresponding to the current working cylinder, in the multiple to-be-worked cylinders is determined; determining a rail pressure correction value of the target cylinder during last injection; the reference rail pressure of the current working cylinder is obtained based on a rail pressure sensor arranged at the fixed position; and the sum of the reference rail pressure and the rail pressure correction value serves as the injection rail pressure of the current working cylinder during next injection. The method does not need to design dynamic interruption to collect the rail pressure, avoids the problems of conflict and the like existing in dynamic interruption, improves the safety during injection, improves the accuracy of the finally determined injection rail pressure, and further improves the injection precision of fuel oil.

The invention discloses a fault detection method and device for a urea injector, a tail gas treatment system and a vehicle. The fault detection method comprises the steps that the current working state of the urea injector is obtained; acquiring electric energy data of the ejector control loop; the fault state of the urea injector is determined according to the current working state and the electric energy data, by means of the method, the fault condition of the injector can be detected in time, so that the injection precision of the urea injector is improved, and the problem that nitrogen oxide in tail gas exceeds the standard due to the influence of the injection precision of the urea injector is solved.

This utility model relates to the field of water-jet looms and discloses a nozzle structure for a polyester water-jet loom, including a limiting ring fixed to the outer wall of the nozzle body. The limiting ring has several receiving holes, and the inner wall of each receiving hole has a receiving groove. A magnet is fixed to the inner wall of the receiving groove. A fixing cover is provided at one end of the nozzle body, and the fixing cover has a through hole corresponding to the nozzle body. Several L-shaped retaining strips are fixed to the fixing cover, and these L-shaped retaining strips are magnetically attracted to the magnet. In this utility model, through the synergistic action of the receiving groove, magnet, fixing cover, and L-shaped retaining strips, the nozzle core can be axially limited and circumferentially locked under the action of the pressing ring, ensuring greater stability of the nozzle core within the inner wall of the nozzle body. This effectively prevents the fixing cover from rotating due to vibration and avoids the risk of the nozzle core falling out of the nozzle body.

The invention discloses a single-nozzle dual-fuel injector, an engine and a control method. The injector comprises an injector body, and a first nozzle is formed in the bottom end of the injector body; a first oil inlet and a second oil inlet which are used for inputting first fuel and second fuel into the device body are respectively formed in the upper part of the device body; the first nozzle is communicated with a first valve cavity in the device body through a first oil duct; a first needle valve capable of sliding in a reciprocating mode is inserted into the first valve cavity, and a first control mechanism is arranged at the upper end of the first needle valve. A one-way valve is arranged on the first oil duct; the second oil inlet is communicated with a second valve cavity in the device body, a second needle valve capable of sliding in a reciprocating mode is inserted in the second valve cavity, and a second control mechanism is arranged at one end of the second needle valve. The second nozzle is arranged in the device body and is communicated with the second oil duct; and the other end of the second oil duct is communicated with the first valve cavity. Two kinds of fuel share one nozzle, the two kinds of fuel can be independently injected in an electric control mode, then the fuel injector can be replaced for an engine used in the market, a cylinder cover does not need to be replaced, and upgrading and reconstruction are facilitated.

The utility model relates to the technical field of foam fire guns, in particular to a foam liquid input mechanism for a foam fire gun. According to the technical scheme, a connecting base is installed at a port of a tank body in a threaded mode, a liquid suction column is installed in the connecting base, a one-way valve is installed at the position, located at the tail end of the liquid suction column, of the connecting base through a spring, a valve element is arranged in the one-way valve, and when negative pressure suction exists at the position of the one-way valve, the valve element is opened; a ventilation valve is arranged on one side of the connecting base, a gulp valve is installed in the ventilation valve, the ventilation valve is communicated with the interior of the connecting base through the gulp valve, a top cover is connected to the connecting base in a clamped mode, and a nozzle is installed on the top cover. According to the foam bottle, standard filling can be achieved, foam can be replaced more quickly, the storage time of foam liquid is prolonged, carrying and transportation are convenient, and meanwhile more labor can be saved due to the waist hanging design.