5results about How to "Make sure it's closed" patented technology

The utility model belongs to air conditioning technical field, concretely relates to a kind of inspection filling device for air conditioner circulation pipeline, including high pressure circulation pipe and low pressure circulation pipe, high pressure circulation pipe and low pressure circulation pipe are all equipped with three-way connector, the free pipe end of three-way connector is welded with vertical direct pipe of intercommunication, pressure control valve is installed on vertical direct pipe, bending pipe is installed on pressure control valve, and pressure gauge is installed in the lower free end of bending pipe, the free side of three-way connector is equipped with filling control valve.The utility model is by the pressure gauge of being set in the lower side of high pressure circulation pipe and low pressure circulation pipe, to intuitively monitor the high-low voltage state of refrigerant pipeline in room, it is convenient to judge and supplement refrigerant in time.Meanwhile, the filling control valve on three-way connector is not only closed by protection component, but also can be conveniently disassembled to control filling control valve, and refrigerant filling operation is carried out to circulation pipeline on indoor side, significantly improve operation safety.

The application relates to the technical field of pre-charging circuits, and discloses a pre-charging circuit and a charging method, wherein the pre-charging circuit comprises a switching unit, a constant-current generating unit and a comparison control unit; the switching unit comprises an input end, an output end and a control end; the constant-current generating unit is connected in parallel with the input end and the output end, and generates a pre-charging current which is constant in size and is input to the output end when the input end and the output end are disconnected; the comparison control unit generates a control signal which is input to the control end based on the voltage difference between the input end and the output end; when in use, when initially powered on, the application provides the output end of the switching unit with a constant pre-charging current through the constant-current generating unit, guarantees that the current is constant and does not attenuate during the pre-charging process, can shorten the pre-charging time and inhibit the impact current in the initial power-on period, and protects the switching unit and the battery pack; and by adjusting the size of the pre-charging current output by the constant-current generating unit, the bus capacitor with different capacitances and the battery with different voltage grades can be adapted, and the generality is high.

The invention discloses a diffraction optical waveguide and an AR (Augmented Reality) display device, and relates to the technical field of AR display, the waveguide is characterized in that a single-layer waveguide structure is matched with an innovative layout of a double-sided diffraction region, a first surface is provided with a first diffraction region, a second diffraction region and a third diffraction region, and a second surface is provided with a fourth diffraction region, a fifth diffraction region and a sixth diffraction region; wherein the first diffraction area is responsible for coupling blue light and green light, the fourth diffraction area is responsible for coupling red light, and the double-coupling design effectively improves the coupling efficiency and uniformity of light with different wavelengths. Wherein the second diffraction region and the fifth diffraction region are mutually expanding and coupling-out regions, the occupied area of the structure is greatly reduced, the waveguide sheet is compact, light and thin, meanwhile, the third diffraction region and the sixth diffraction region serve as recycling regions, residual light energy can be recycled, and the overall light efficiency is remarkably improved. And through optimization of the grating direction, vector closing of light with different wavelengths in the waveguide is ensured, no dispersion is generated, and thus high uniformity and coincidence of image colors are ensured.

The present application relates to oil and gas equipment technical field, provide a kind of offshore emergency blowout preventer, including main body, the first passage is opened in the vertical direction and passes through on the main body, second passage is opened in the horizontal direction in the main body, the second passage is opened with two, two The second passage is symmetrically arranged, the second passage and first passage are interconnected, sealing gate is slidably arranged in each second passage along the length direction of second passage, sealing element is arranged on the side wall of two sealing gates that are close to each other, driving assembly is arranged on the main body, and the driving assembly is used to drive sealing gate to move in second passage, the safety effect of the present application can improve blowout preventer, avoid well backflow.

This utility model discloses a drawer device used for loading and unloading materials, relating to the field of automatic detection equipment technology. It includes a slide structure and a drawer structure connected to the slide structure. The slide structure can drive the drawer structure to slide back and forth, bridging the gap between the mechanical material handler and the equipment's outer cover. The slide structure includes a push-pull cylinder connected to the worktable, with a slide rail connected to the telescopic end of the cylinder. This utility model uses the push-pull cylinder of the slide structure to drive the drawer structure to slide, bridging the gap between the mechanical material handler and the equipment's outer cover. This solves the limitation that the material tray placement must be confined to the area of ​​the outer cover, restoring the material tray length to the slide rail travel distance, reducing the frequency and intensity of manual loading and unloading. Furthermore, the manual material handler can pull the material tray out of the equipment via the drawer handle without having to bend down and reach into the equipment.