Positive pressure type low-temperature air curtain

Abstract

The invention belongs to the technical field of air curtains, and particularly relates to a positive pressure type low-temperature air curtain which is characterized in that an air pump set is connected with an ejector through a compressed air pipe, the ejector is connected with the air curtain through a mixed gas pipeline, the air curtain is arranged in a refrigeration house, and the air pump set is located outside the refrigeration house; the air curtain comprises an air curtain pipe, end plates are arranged at the two ends of the air curtain pipe, an inner cavity of the air curtain pipe is a static pressure chamber, and spraying holes are formed in the side wall of the air curtain pipe. The ejector comprises a receiving chamber, a mixing chamber, a throat pipe and a diffusion chamber are sequentially installed at the front end of the receiving chamber, a nozzle is arranged in the receiving chamber and connected with a compressed air pipe, the diffusion chamber is connected with a mixed gas pipeline, the receiving chamber is connected with a low-temperature gas pipeline, and the low-temperature gas pipeline extends into the refrigeration house. The positive pressure type low-temperature air curtain can prevent hot and humid air outside the refrigeration storage from flowing into the refrigeration storage and can be installed in the refrigeration storage.

Description

technical field [0001] The invention belongs to the technical field of air curtains, in particular to positive pressure low-temperature air curtains. Background technique [0002] current technology: [0003] Air curtain is another form of local air supply. Its purpose is to generate an air barrier to reduce and block the convection of indoor and outdoor air. [0004] The core component of the known air curtain used in cold storage is a cross-flow fan driven by a power supply. Since the cross-flow fan is only suitable for normal temperature environments, if it is installed on one side of the cold storage (such as -18 ° C in the cold storage for storing food, the storage of plasma -30°C in the automatic cold storage), the motor lubricating oil of the above-mentioned cross-flow fan will solidify and become invalid, and the air curtain in the cold storage will not be able to operate. Therefore, known cold storage air curtain all is to be contained in the normal temperature en...

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Problems solved by technology

[0006] Another defect of the known air curtain for cold storage is that it cannot completely block the convection of the air inside and outside the cold storage. Since the pressure inside and outside the cold storage is basically the same after the door is opened, there is still a gap between the upper and lower parts of the cold storage door opening. Partial convection will be formed, so that when the cold storage is opened, despite the known air curtain, hot and humid air outside the cold storage will continue to enter the cold storage, and frost will gradually form in the cold storage. The accumulated frost in the cold storage will seriously affect the refrigeration of the cold storage. The effect, the long-standing problem that affects the operation of the automation device in the cold storage

[0007] Another drawback of the known installation of air curtains for cold storage is: especially for automatic cold storage, the automatic door has an electric mechanism for automatically opening and closing the door leaf, and this mechanism is installed on the outside of the cold storage insulation board, that is, in the normal temperature environment. side of

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