A kind of ultra-low temperature refrigeration method

An ultra-low temperature refrigeration and refrigerant technology, which is used in refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve the problems of fluctuation in refrigeration capacity, small fan pressure, and excessive adjustment flow, and achieve continuous and stable maintenance and stable operation.

Active Publication Date: 2018-03-13
DIBANGSHI COOLING TECH SUZHOU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, there are defects in this solution: 1. Due to the characteristics of the motor, the speed of the outdoor fan cannot be reduced without limit; 2. When the speed of the outdoor fan is low, the wind pressure of the fan is small, and the heat exchange on the condensation side in different wind directions outdoors There is a large difference in strength; 3. When the outdoor fan is 0, there is a safety risk of high pressure and overpressure; 4. The minimum outdoor ambient temperature of this scheme is generally -15~-5℃
[0007] However, there are defects in this scheme: 1. Since the heat exchange intensity in the condenser tube is adjusted by the electromagnetic valve switch to maintain the system circulation pressure on the condensation side, there are pressure fluctuations in the refrigeration system, and the load of the compressor and the cooling capacity obtained in the room also fluctuate accordingly ; 2. This scheme is mainly used in refrigeration and refrigeration systems; 3. This scheme is suitable for the refrigeration system of fixed-speed machines, and there is a defect that the flow rate of the variable frequency compressor is too large

Method used

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  • A kind of ultra-low temperature refrigeration method
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  • A kind of ultra-low temperature refrigeration method

Examples

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Effect test

Embodiment 1

[0027] see figure 1 , the single-cooling split air conditioner of the present invention can refrigerate at ultra-low temperature, including a compressor 1, a condenser 5, an evaporator 2, an electronic expansion valve-3 for bypass, a capillary tube 4 for partial pressure, a liquid storage tank 6, and at least one throttle element, at least one auxiliary device, at least one shut-off valve. The compressor 1, the condenser 5, and the evaporator 2 form a refrigerant cycle.

[0028] Throttle elements, auxiliary devices, and stop valves can be set according to actual conditions. Valves may include liquid valves, gas valves, and the like. In this embodiment, the throttling element includes electronic expansion valve II 13, the auxiliary devices include pressure sensor Pc, thermometer Tcc, Tc, To, Td, Ts, Tii, Te, Tio, etc., and the stop valve includes liquid valve 7, gas valve 12.

[0029] The compressor 1 and the condenser 5 constitute the main frame of the outdoor unit, and th...

Embodiment 2

[0037] see figure 2 , the cooling-only split-type air conditioner in Embodiment 2 is basically the same as the cooling-only split-type air conditioner in Embodiment 1, the difference being that the cooling-only split-type air conditioner in Embodiment 2 also includes a heat regenerator 8 . After coming out of the liquid storage tank 6, the liquid refrigerant passes through the regenerator 8 and then is connected to the evaporator 2, and then passes through the regenerator 8 to the compressor 1 after coming out of the evaporator 2.

[0038] That is to say, the regenerator 8 (between the liquid storage tank 6 and the throttling element) is added on the basis of the first application example. The liquid refrigerant at the outlet of the liquid storage tank 6 is close to saturation. In order to ensure a more stable operation of the system, the near-saturated liquid refrigerant at the outlet of the liquid storage tank 6 exchanges heat with the refrigerant on the suction side of the...

Embodiment 3

[0040] see image 3, the cooling-only split-type air conditioner in Embodiment 3 is basically the same as the cooling-only split-type air conditioner in Embodiment 1, and the difference is that the cooling-only split-type air conditioner in Embodiment 3 also includes an oil separator 9 and a check valve 10 11. Oil separation capillary. The gaseous refrigerant is compressed by the compressor 1 and enters the oil separator 9 to be separated into the gaseous refrigerant accompanied by lubricating oil and the gaseous refrigerant from which the lubricating oil has been separated, and the gaseous refrigerant accompanied by lubricating oil returns to the compressor 1 through the oil separation capillary 11 The suction port re-enters the compressor 1; the gaseous refrigerant from which the lubricating oil has been separated is discharged from the oil separator 9 and enters the condenser 5 through the check valve 10.

[0041] On the basis of Application Example 1, add oil separator 9,...

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Abstract

The invention discloses an ultra-low temperature refrigeration method for an ultra-low temperature refrigeration single cooling split type air conditioner. The cooling-only split air conditioner includes an evaporator, a compressor, a condenser, an electronic expansion valve for bypass, a capillary for pressure division, and a liquid storage tank. When the outdoor temperature is higher than 15°C, the system circulation pressure of the refrigerant cycle on the condensing side is maintained by adjusting the fan speed of the outdoor condenser; , the superheated steam refrigerant discharged from the compressor is bypassed directly before the liquid storage tank, and mixed with the low-temperature liquid refrigerant that has been heat-exchanged by the outdoor condenser to become a high-temperature two-phase refrigerant. The invention reduces the heat exchange intensity in the condenser tube in a continuously adjustable way to maintain the system circulation pressure on the condensation side, thereby maintaining the normal refrigerant circulation of the refrigeration system and achieving normal refrigeration under the condition of ultra-low outdoor ambient temperature .

Description

technical field [0001] The invention relates to a refrigeration method, in particular to an ultra-low temperature refrigeration method. Background technique [0002] In some usage scenarios, regardless of the outdoor temperature (50°C high or -40°C low), the indoor environment needs to be refrigerated. [0003] At present, there are mainly two processing schemes for low-temperature refrigeration in the market. [0004] 1. Maintain the system circulation pressure on the condensing side by reducing the heat transfer intensity outside the condenser tube, so as to maintain the normal refrigerant circulation of the refrigeration system, and achieve normal refrigeration under the ultra-low outdoor ambient temperature. That is: reduce the intensity of outdoor heat exchange by reducing the speed of the outdoor fan. [0005] However, there are defects in this solution: 1. Due to the characteristics of the motor, the speed of the outdoor fan cannot be reduced without limit; 2. When ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B1/00F25B41/04F25B41/06F25B49/02F25B41/20F25B41/30
CPCF25B1/00F25B49/02F25B2600/2513F25B2400/04F25B41/31F25B41/20Y02B30/70
Inventor 李子智
Owner DIBANGSHI COOLING TECH SUZHOU CO LTD
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