A multi-layer belt drying system based on two-stage heat pumps in parallel

A drying system and multi-layer belt technology, applied in heat pump, drying gas arrangement, drying and other directions, can solve the problems of large temperature and humidity difference of return air, difficult to meet requirements, etc., and achieve the effect of increasing the temperature of supply air

CN107687759BActive Publication Date: 2020-06-16TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2020-06-16

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Abstract

The invention provides a multi-layer belt type drying system based on two-stage heat pump parallel connection. The multi-layer belt type drying system comprises a drying chamber and a heat pump circulating subsystem. Air inlets are formed in the bottom of the drying chamber, and air outlets are formed in the top of the drying chamber. Multiple layers of conveying net belts are located in the drying chamber. The heat pump circulating subsystem comprises multiple circulating pipelines and multiple heat pump units connected in parallel. Any heat pump unit comprises an evaporator, a first-stage compressor, a liquid storage tank, a second-stage compressor, a condenser, a second-stage throttle valve and a first-stage throttle valve, wherein an independent circulating loop is formed by the evaporator, the first-stage compressor, the liquid storage tank, the second-stage compressor, the condenser, the second-stage throttle valve and the first-stage throttle valve. The evaporator and the condenser of any heat pump unit are put in any circulating pipeline. The two ends of each circulating pipeline are connected with the corresponding air inlet and the corresponding air outlet correspondingly. According to the multi-layer belt type drying system based on two-stage heat pump parallel connection, the heat pump circulating subsystem with the multiple heat pump units connected in parallel isadopted, air is subjected to joint cooling and dehumidification and joint heating, and the problem that when the air supply and return temperature and humidity difference is large, the multi-layer belt type drying system hardly meets the requirements is solved.
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Description

Technical field

[0001] The invention relates to the field of drying technology, and more specifically, to a multi-layer belt drying system based on two-stage heat pumps in parallel. Background technique

[0002] At present, the multi-layer belt drying system is widely used in industry. The multi-layer belt drying system has the advantages of fast drying rate, less area, simple structure, etc. It is used for drying materials such as flakes, strips and granules with good air permeability. It is suitable for dehydrated vegetables, traditional Chinese medicine pieces, catalysts, etc. Dry heat sensitive materials with high rate are especially suitable.

[0003] The heating and dehumidifying system of the existing multi-layer belt drying system usually adopts a heat pump system, a heater, etc. Among them, the heat pump system generally uses a single-stage heat pump system. The performance of a single-stage heat pump system is greatly affected by environmental factors such as temperatu...

Examples

Embodiment Construction

[0032] The specific embodiments of the present invention will be described in further detail below in conjunction with the drawings and embodiments. The following examples are used to illustrate the present invention, but not to limit the scope of the present invention.

[0033] In the description of the present invention, unless otherwise specified, "plurality" means two or more; "several" means one or more; the terms "upper", "lower", "left" , "Right", "Inner", "Outer", "Front", "Rear", "Head", "Tail" and other directions or positional relations are based on the positions or positional relations shown in the drawings, only It is for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the pointed device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0034] figure 1 It is a schem...