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A variable frequency variable capacity heat pump hot air drying system and its control method

A technology of hot air drying and variable capacity, which is applied to heat pumps, drying machines, dryers, etc., to achieve the effects of reducing energy consumption, improving energy efficiency, and ensuring reliability

Active Publication Date: 2022-03-25
JIANGSU TENESUN ELECTRICAL APPLIANCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a heat pump hot air drying system with variable frequency and variable capacity, which is used to solve the technical problems existing when the existing heat pump hot air drying system provides high temperature hot air

Method used

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  • A variable frequency variable capacity heat pump hot air drying system and its control method
  • A variable frequency variable capacity heat pump hot air drying system and its control method
  • A variable frequency variable capacity heat pump hot air drying system and its control method

Examples

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Effect test

Embodiment 1

[0075] An example of the multi-stage temperature control curve and the temperature control parameter configuration interface is: Figure 8 As shown, the multi-stage temperature control curve in this embodiment is a 10-stage heating curve, and the control device 500 controls the dual-circulation hot air drying system to realize intelligent automatic operation by configuring the set temperature and temperature stabilization time of each time period, No manual manipulation required.

[0076] according to Image 6 In the embodiment of the control method of the heat pump type dual-cycle hot air drying system of the present invention shown, the step S400 includes the following control operations:

[0077] S420: If the set temperature is less than 45°C, close the unloading solenoid valve 12 and enter the single-cycle conventional heating mode; in this mode, the opening degree of the internal circulation air valve 23 is 0%, and the opening degree of the air supply regulating valve 24...

Embodiment 2

[0082] The size of a tobacco drying room is: 8 × 2.8 × 2.2 m, and the amount of tobacco leaves dried at one time is 350 rods, each of which is 30 kg of tobacco leaves, totaling 10,500 kg. The variable-frequency variable-capacity heat pump hot air drying system consists of a 6-hp fixed-frequency compressor 1-1 and a 6-hp variable-frequency compressor 1-2 in parallel, with a maximum heating capacity of 50kW. The frequency conversion and variable capacity connection structure of the unit is as follows Figure 4 shown. For the temperature control curve of the flue-cured tobacco process, see Figure 9 As shown in the multi-stage drying process diagram, the heat consumption in each period is as follows: Figure 10 shown. The control device 500 selects an appropriate operation mode through comparative analysis to achieve maximum operation efficiency.

[0083] according to Figure 7 In the embodiment of the control method of the variable frequency variable capacity heat pump hot ai...

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Abstract

A variable-frequency variable-capacity heat pump hot-air drying system and its control method, relating to an air or gas supply or control device for drying solid materials or products, in particular to a heat-pump hot-air drying system and a control method for the system , the heat pump unit includes a fixed-frequency compressor and a variable-frequency compressor, a fixed-frequency circulation pipeline and a variable-frequency circulation pipeline, and a variable-capacity branch of the heat exchanger controlled and connected through the first solenoid valve group and the second solenoid valve group; the control device Connected to the first solenoid valve group and the second solenoid valve group, control the opening state of the first solenoid valve group and the second solenoid valve group, change the connection mode of the variable capacity branch of the heat exchanger, and control the heat pump hot air drying system to enter double Machine variable capacity operation mode; through the parallel operation of the fixed frequency system and the frequency conversion system, the two systems of fixed frequency and frequency conversion are fully integrated together, and the dual machine variable capacity operation mode is realized through the combination of fixed frequency and variable capacity, which meets the needs of the drying room during the baking process. Temperature variation and energy consumption variation requirements.

Description

technical field [0001] The present invention relates to a device for supplying or controlling air or gas for drying solid materials or products, in particular to a heat pump type hot air drying system and a control method for the system. Background technique [0002] At present, there are more and more places on the market that need hot air drying, such as tobacco drying, grain drying, medicinal material drying, fruit and vegetable drying and other drying places. Coal stoves, gas stoves, and electric stoves are mainly used for drying. Coal and gas are non-renewable strategic energy sources, which are not the direction of national promotion. Electric furnaces are not suitable for mass promotion due to high energy consumption and high operating costs. In the past, coal stoves were used to heat hot water for heating in northern rural areas. The country has comprehensively promoted the use of heat pumps instead of coal stoves in rural areas, which proves that heat pumps still ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F26B21/08F26B21/10F25B30/02F25B30/06F25B41/40F25B41/00
CPCF25B30/02F25B30/06F26B21/002F26B21/08F26B21/10F25B41/40
Inventor 王玉军吴运运吴小网刘军王颖王天舒杨奕
Owner JIANGSU TENESUN ELECTRICAL APPLIANCE
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