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Control method for varying condition operation of throttling refrigerating system of deep freezing mixed working-fluid

A refrigeration system and mixed working medium technology, which is applied in refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve the problems of increased cooling process time, system recovery delay, and temperature rise

Inactive Publication Date: 2005-10-19
中科赛凌(北京)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cycle described in this patent application is relatively complicated, there are as many as dozens of controllable valves to realize the defrosting process, and at the same time, the refrigeration system (heat exchanger part) does not have a refrigerant to provide continuous cooling during defrosting, and there must be a temperature rise. Causes the time of the next cooling process to increase, that is, the system recovery delay

Method used

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  • Control method for varying condition operation of throttling refrigerating system of deep freezing mixed working-fluid
  • Control method for varying condition operation of throttling refrigerating system of deep freezing mixed working-fluid
  • Control method for varying condition operation of throttling refrigerating system of deep freezing mixed working-fluid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0126] Embodiment 1: adopt figure 1 The refrigeration process and control system shown in the figure, the system includes a mixed working fluid throttling refrigeration process and operation control system, which includes a single-stage oil-lubricated commercial compressor 1 in the refrigeration process, a condenser 2 matched with the compressor, A combination of heat exchangers with a balanced flash vapor-liquid separator is used as the heat recovery unit 3 (see the schematic diagram for the specific structure Figure 5 ), a throttling control unit group 4, an evaporator 5, and some connecting pipes. The operation control system includes a control unit 6 , a compressor intake pressure sensor 601 , an exhaust pressure sensor 602 and an evaporator outlet temperature sensor 603 . The throttling control unit group includes a main throttling element A, an auxiliary throttling element B and a bypass throttling element C.

[0127] According to the variable working condition operat...

Embodiment 2

[0138]Embodiment 2: A typical mixed working medium refrigeration and control system, including a mixed working medium throttling refrigeration process and operation control system, which includes a single-stage oil-lubricated commercial compressor 1 in the refrigeration process, and a matching compressor Condenser 2, using a combination of heat exchangers with a balanced flash vapor-liquid separator as the heat recovery unit 3 (see the schematic diagram for the specific structure Figure 4 ), a throttling control unit group 4, an evaporator 5, and some connecting pipes. The operation control system includes a control unit 6 , a compressor intake pressure sensor 601 , an exhaust pressure sensor 602 and an evaporator outlet temperature sensor 603 . The throttling control unit group includes a main throttling element A, a bypass throttling element C, and an auxiliary throttling element B is composed of two parallel-connected first controllable throttling elements B1 and second au...

Embodiment 3

[0156] Embodiment 3: The refrigeration system is the same as Embodiment 2, except that the controllable auxiliary throttling element B in the throttling control unit group 4 is composed of the first controllable auxiliary throttling element B1 and the second controllable auxiliary throttling element B1 connected in parallel. The component B2 and the third controllable auxiliary throttling component B3 are composed, and the control steps of the cryogenic mixed working fluid refrigeration system for variable working conditions are as follows:

[0157] 1. For the controlled cooling condition: open the main throttling element A, close the controllable bypass throttling element C,

[0158] 1) When the control unit 6 satisfies one of the following conditions, simultaneously open the first controllable auxiliary throttle element B1, the second controllable auxiliary throttle element B2 and the third controllable auxiliary throttle element B3:

[0159] ●The discharge pressure value 60...

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PUM

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Abstract

The refrigerating system includes compressor unit in lubricant separator, cooler, heat returning unit, throttling control unit set, evaporator unit and controller unit. The input parameters of the controller unit include air admission pressure and exhaust pressure of compressor in refrigerant system and / or exit temperature of the evaporator; the output parameters are in the commands of opening and closing the throttling control unit set. The throttling control unit set includes main controllable throttle element A, auxiliary controllable throttle element B and by-pass controllable throttle element C. For cryogenic mixed work medium throttling refrigerating system with different operation states, the control method includes comparing preset value and the input parameter and controlling the opening and closing and flux of throttle element to realize the control of circulating work medium flow rate and ultimate stable and reliable operation of refrigerator in different work conditions.

Description

field of invention [0001] The invention relates to low-temperature refrigeration technology, in particular to a control method for the operation of a cryogenic mixed working medium throttling refrigeration system under variable working conditions, so as to realize the efficient and reliable operation of the mixed working medium throttling refrigeration system under variable working conditions. Background technique [0002] The minimum effective refrigeration temperature of the traditional single-stage vapor compression refrigeration cycle is generally around -40°C. To achieve a lower refrigeration temperature, it is often necessary to use multi-stage compression and multi-stage external cascade cycles. However, this measure obviously makes the refrigeration system become It is very complicated and the reliability is reduced. At present, two-stage compression is used to achieve a refrigeration temperature of about -60°C, and a two-stage cascade cycle is used to achieve a refri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B49/02F25J3/00
Inventor 吴剑峰公茂琼罗二仓
Owner 中科赛凌(北京)科技有限公司