8results about How to "Improve pre-cooling effect" patented technology

This invention discloses a rapid negative pressure pretreatment machine for fruits and vegetables, comprising a fixed frame and a negative pressure chamber. The negative pressure chamber is fixedly installed inside the fixed frame. A cold air assembly is installed at the bottom of the inner wall of the fixed frame, and a conveyor belt is fixedly installed near the top of the inner wall of the fixed frame to transport fruits and vegetables into the negative pressure chamber. A reciprocating moving assembly is fixedly installed on the conveyor belt. This invention solves the problems of uneven precooling and blind spots in existing negative pressure pretreatment machines for fruits and vegetables. Through the linkage design of the reciprocating moving assembly and the cold air assembly, combined with the flipping action of the lever, two sets of symmetrically arranged cold air nozzles are located at the top and bottom of the conveyor belt, respectively. With the reciprocating swing and linear movement, and the lever flipping the fruits and vegetables, the upper and lower surfaces, sides, and contact parts of the fruits and vegetables can be fully contacted with the cold air, ensuring uniform cooling of the same batch of fruits and vegetables. This solves the problems of large differences in cooling rate and poor negative pressure treatment effect caused by traditional precooling.

This invention discloses a rapid precooling system and method for a liquid hydrogen refueling station, belonging to the field of liquid hydrogen technology. The precooling system includes a liquid hydrogen refueling pipeline, a liquid hydrogen supply tank, a valve subsystem, a liquid hydrogen refueling tank, a circulation pipeline, a condenser, a gas-liquid separator, a liquid carbon dioxide tank, a storage cylinder, a helium pipeline, a high-pressure helium cylinder, a fuel cell, a cryogenic hydrogen pipeline, and a liquid hydrogen storage tank group. This system utilizes liquid carbon dioxide and cryogenic helium to achieve deep coupling between system displacement and precooling operations. After displacement, the system temperature has dropped below the temperature of liquid carbon dioxide, significantly reducing precooling time. It also utilizes cryogenic hydrogen stored in the liquid hydrogen storage tank group to liquefy carbon dioxide, achieving carbon dioxide medium circulation. Simultaneously, the hydrogen released after cooling and the hydrogen generated during precooling are transported to the fuel cell for power generation, improving hydrogen utilization efficiency.

This invention discloses a combined power cycle system and method for cooling incoming air using ammonia-water, relating to the aerospace field. The system can switch between turbine-ramjet operating modes through an adjustable structure. Particularly during turbine-ramjet switching, ammonia-water is used to cool the high-temperature incoming air in the intake duct. The absorbed ammonia-water is then distilled to separate high-temperature ammonia gas and water. This invention combines heat exchanger precooling and jet precooling, effectively increasing the pressure ratio of the fan and compressor through multiple air cooling processes. This improves the compressor outlet gas temperature, thereby reducing compressor power consumption and providing greater thrust. Ammonia, as a supplementary fuel, has a higher specific impulse, addressing the thrust gap during engine mode transitions and effectively widening the operating speed range of the turbine engine.

The utility model provides a litchi precooling device, which relates to the technical field of fruit preservation, and comprises a precooling pool, a cover plate, a connecting frame and a plurality of net-shaped storage containers, a plurality of precooling grooves and a plurality of cold source grooves are arranged in the precooling pool, the precooling grooves and the cold source grooves are alternately arranged, a separation net connected with the precooling pool is arranged between the adjacent precooling grooves and cold source grooves, and the net-shaped storage containers are connected with the precooling pool. The connecting frame is connected with the multiple net-shaped storage containers, one end of the connecting frame is hinged to the pre-cooling pool, telescopic assemblies are hinged to the two sides of the pre-cooling pool respectively, the two sides of the connecting frame are hinged to the movable ends of the corresponding telescopic assemblies respectively, the net-shaped storage containers are arranged in the corresponding pre-cooling grooves, and the cover plate is connected with a first telescopic frame and a second telescopic frame. The first telescopic frame is in sliding connection with the pre-cooling pool, the cover plate is matched with the pre-cooling pool, the net-shaped storage container can make litchis immersed in cold water, the pre-cooling effect of the litchis is improved, the litchis are separated from ice blocks, mechanical damage to the litchis is avoided, and the quality of the litchis is guaranteed.

The utility model relates to an energy -conserving continuous operation's compressed air cold dry device, include: casing, the inside partition becomes the inner area and the outer area of bottom intercommunication arrangement, guide and discharge mechanism contain 2N synchronous rotation installation in the hollow disc in the inner area, the first odd hollow disc is connected between the lower adjacent hollow disc by multiple circumferential annular array distribution's guide pipe, and the first even hollow disc is connected through the coaxial pipe of center between the lower adjacent hollow disc, the bottom plate in the guide flow cavity of first even hollow disc is provided with multiple guide plates along annular array distribution setting, guide gas mechanism contains multiple annular array distribution and the guide through piece of hollow disc up and down, guide liquid mechanism contains the spiral blade that rotates and is installed in the outer area and is set to the spiral blade that leans down, spiral blade connects to the lowest hollow disc, the utility model can effectively improve the efficiency and effect of air cooling drying, and can realize the energy -conserving effect through the waste heat recovery regeneration.

The invention relates to the technical field of cable maintenance and pipeline plugging, and discloses an oil-filled cable freezing device capable of expanding an oil-filled cable chamber, which comprises a freezing main chamber, an oil-filled cable body is arranged in the freezing main chamber, and a standardized interface is arranged at the bottom of the freezing main chamber. The main freezing chamber is fixedly connected with a flange through a standardized interface, the main freezing chamber is fixedly connected with an auxiliary freezing chamber through the flange, a copper bottom plate is arranged in the main freezing chamber and surrounds the oil-filled cable body, and a liquid nitrogen conveying pipe with a nozzle is arranged in the copper bottom plate. An air guide opening is formed in the upper portion of the main freezing cavity, a cold guide pipe is fixedly connected into the auxiliary freezing cavity, and the auxiliary freezing cavity is fixedly connected with the air guide opening through the cold guide pipe. According to the invention, the working condition adaptability and deployment flexibility of the device are enhanced through modular design; and through cascade reuse of cold nitrogen, maximum utilization of cold energy is achieved, and high efficiency and economical efficiency are both achieved.

A vacuum three-chamber ultra-high temperature shock testing device and method are disclosed, relating to the field of temperature shock testing technology. The device includes: a vacuum chamber containing, from top to bottom, a high-temperature chamber, a pre-cooling conversion chamber, and a low-temperature cooling chamber; a lower moving mechanism for controlling the lifting and lowering of a sample stage to allow the sample stage to enter the three chambers; movable heat insulation screens positioned at predetermined distances above and below the sample stage, and raised and lowered synchronously with the sample stage by the lower moving mechanism; and a water-cooled cooling jacket movable vertically within the high-temperature chamber, with an upper moving mechanism controlling its descent after heating in the high-temperature chamber to achieve sample pre-cooling. This temperature shock testing device extends the ultra-high temperature and pre-cooling capabilities of temperature shock testing devices, significantly improving their performance range.

The application belongs to the field of hydraulic systems, and discloses a digital intelligent temperature control heat dissipation system, which comprises a heat dissipation device, a temperature control assembly, an oil inlet pipeline and an oil outlet pipeline, the heat dissipation device comprises a fan and a composite heat dissipation assembly arranged at the air outlet end of the fan, and the composite heat dissipation assembly is communicated with a hydraulic station through the oil inlet pipeline and the oil outlet pipeline. The effective combination of water cooling and air cooling can be realized through the composite heat dissipation assembly, the oil network pipe component can be pre-water-cooled through water cooling of the water cooling chamber, and further air cooling can be realized through the heat dissipation structure similar to the capillary pipeline under the action of air cooling, the cooling liquid after absorbing heat in the water cooling chamber can be air-cooled through the network air cooling part, so that the cooling liquid can be water-cooled for a longer time, and the network air cooling part and the pipe connection part of the air cooling area are staggered, so that air cooling and heat dissipation can be realized for both at the same time under the air cooling action of the fan.