4results about How to "Increase the projected area" patented technology

The invention relates to a two-chamber low-pressure casting holding furnace and a low-pressure casting method. The two-chamber low-pressure casting holding furnace comprises a heat preservation chamber, a low-pressure casting chamber, a communicating cavity, a liquid rising pipe, a first air inlet pipe and a liquid opening, wherein the heat preservation chamber comprises a precipitation cavity and a confluence cavity; and the communicating cavity comprises a liquid inlet section, a transition section and a liquid outlet section. Compared with the prior art, the heat preservation chamber of the holding furnace is directly communicated with the low-pressure casting chamber, an intermediate valve is omitted, and the pressure bearing capacity of the holding furnace is greatly improved; and large pressure can be generated by arranging a second air inlet pipe and enabling the second air inlet pipe to be matched with the first air inlet pipe, so that the overall working performance of the holding furnace is improved in a spanning manner, the holding furnace can be used for producing thin structural parts, such as automobile chassis parts, A columns and B columns, with larger projection areas, and the practicability of the holding furnace is greatly improved.

The application relates to the technical field of biosensors, and discloses a glucose sensor with a three-dimensional microcavity and a manufacturing method thereof, wherein the sensor comprises a substrate provided with at least one microcavity penetrating through the substrate; a conductive layer covering at least one side surface of the substrate and an inner wall of the microcavity, wherein the conductive layer located on the inner wall of the microcavity forms a three-dimensional microcavity sensing area; and a sensing film arranged in the three-dimensional microcavity sensing area and used for reacting with glucose to generate an electrochemical signal; the three-dimensional microcavity sensing area simultaneously provides an electrical connection path of the conductive layers on both sides of the substrate and a loading space of the sensing film. The sensor provided by the application has a high specific surface area feature, can improve the accuracy and long-term stability of the sensor, and is suitable for continuous monitoring of glucose and other physiological markers. Moreover, the manufacturing steps are highly standardized, batch production is easy to realize, and the consistency and stability of product performance are good.

The application discloses a heat exchanger and a gas water heater, and relates to the technical field of water heaters. The heat exchanger comprises a shell, a plurality of heat exchange pipes and a plurality of first water boxes. The shell is internally formed with a heat exchange chamber. The plurality of heat exchange pipes are arranged side by side in the heat exchange chamber along a first direction, and the two ends of the heat exchange pipes extend to opposite side walls of the shell along a second direction. The plurality of first water boxes are arranged on the opposite side walls of the shell along the second direction. Each adjacent two heat exchange pipes are communicated through a first water box, so that the plurality of heat exchange pipes are connected in series to form a heat exchange flow channel. The length of the line connecting the outermost ends of the adjacent two heat exchange pipes in the first direction is defined as L, the diameter of the heat exchange pipe in a third direction is D1, and the projection area of the first water box on the side wall where the first water box is installed is S, and S > L x D1. The first direction, the second direction and the third direction intersect with each other. The technical scheme of the application can reduce the local resistance loss in the heat exchanger and improve the heat exchange efficiency.

The application relates to a back contact solar cell and a photovoltaic module, the back contact solar cell comprising a semiconductor substrate, the semiconductor substrate having a first surface, the first surface comprising a first region and a second region; a first dielectric layer and a first conductive semiconductor layer being stacked in the first region; a second dielectric layer and a second conductive semiconductor layer being stacked in the second region; the second conductive semiconductor layer comprising a first surface and a first side surface; a conductive layer comprising a first conductive part and a second conductive part, the first conductive part being arranged on a side of the first conductive semiconductor layer away from the semiconductor substrate; the second conductive part being arranged on a side of the second conductive semiconductor layer away from the semiconductor substrate; in a second direction, a side of the second conductive semiconductor layer close to the first conductive part and a side of the first conductive part close to the second conductive semiconductor layer have a first distance D1, D1>0; in the second direction, the first side surface and a side of the second conductive part close to the first side surface have a second distance D2, D2>0.