WO2020236472A1 - Heat exchange system and method for reclaiming corrosion inhibitor in heat exchange system - Google Patents

Heat exchange system and method for reclaiming corrosion inhibitor in heat exchange system Download PDF

Info

Publication number
WO2020236472A1
WO2020236472A1 PCT/US2020/032598 US2020032598W WO2020236472A1 WO 2020236472 A1 WO2020236472 A1 WO 2020236472A1 US 2020032598 W US2020032598 W US 2020032598W WO 2020236472 A1 WO2020236472 A1 WO 2020236472A1
Authority
WO
WIPO (PCT)
Prior art keywords
heat exchange
exchange system
compressor
corrosion inhibitor
fluid inlet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2020/032598
Other languages
French (fr)
Inventor
Xiangyuan ZHANG
Haiping Ding
Haitao Zhang
Michael A. Stark
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Carrier Corp
Original Assignee
Carrier Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Carrier Corp filed Critical Carrier Corp
Priority to US17/252,927 priority Critical patent/US11946673B2/en
Publication of WO2020236472A1 publication Critical patent/WO2020236472A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B45/00—Arrangements for charging or discharging refrigerant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B31/00—Compressor arrangements
    • F25B31/002—Lubrication
    • F25B31/004—Lubrication oil recirculating arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2341/00—Details of ejectors not being used as compression device; Details of flow restrictors or expansion valves
    • F25B2341/001—Ejectors not being used as compression device
    • F25B2341/0014—Ejectors with a high pressure hot primary flow from a compressor discharge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2341/00—Details of ejectors not being used as compression device; Details of flow restrictors or expansion valves
    • F25B2341/001—Ejectors not being used as compression device
    • F25B2341/0016—Ejectors for creating an oil recirculation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/16—Lubrication

Definitions

  • the present disclosure relates to a heat exchange system, and more particularly to a device and a method for reclaiming corrosion inhibitor in a heat exchange system.
  • the object of the present disclosure is to solve or at least alleviate the problems existing in the related art.
  • a heat exchange system which includes: a compressor, a condenser and an evaporator connected in sequence, wherein the heat exchange system further includes a system for reclaiming corrosion inhibitor, the system for reclaiming corrosion inhibitor including:
  • an ejector including a high-pressure fluid inlet connected to an outlet of the compressor, a suction fluid inlet connected to the heat exchange system to extract a liquid- state refrigerant in the heat exchange system, and a fluid outlet leading to bearings of the compressor, wherein a pressurizing device is provided between the outlet of the compressor and the high-pressure fluid inlet of the ejector.
  • the pressurizing device is a pump or an additional compressor.
  • the suction fluid inlet is connected to a bottom of the evaporator to extract a liquid- state refrigerant with corrosion inhibitor.
  • the heat exchange system further includes an economizer connected between the condenser and the evaporator, and the suction fluid inlet is connected to a bottom of the economizer to extract a liquid-state refrigerant with corrosion inhibitor.
  • the compressor is a centrifugal compressor
  • the corrosion inhibitor is oil
  • a method for reclaiming corrosion inhibitor in a heat exchange system including a compressor, a condenser and an evaporator connected in sequence, and the method including:
  • the method further includes: providing a pressurizing device between the outlet of the compressor and the high-pressure fluid inlet of the ejector.
  • the pressurizing device is a pump or an additional compressor.
  • the method includes connecting the suction fluid inlet to a bottom of the evaporator to extract a liquid-state refrigerant with corrosion inhibitor.
  • the method includes connecting the suction fluid inlet to a bottom of an economizer between the condenser and the evaporator to extract a liquid-state refrigerant with corrosion inhibitor.
  • the compressor is a centrifugal compressor
  • the corrosion inhibitor is oil
  • the heat exchange system according to the embodiments of the present disclosure can provide sufficient corrosion inhibitor to the bearings of the compressor under various working conditions.
  • FIG. 1 shows a schematic structural view of a heat exchange system according to an embodiment of the present disclosure.
  • orientational terms as“upper”,“lower”,“left”,“right”,“front”,“rear”, “front side”,“back side”,“top”,“bottom” or the like that are mentioned or may be mentioned in this description are defined with respect to the configurations shown in the individual drawings. They are relative concepts and thus possibly vary according to their different locations or different states of use. Therefore, these or other orientational terms shall not be interpreted as limiting terms.
  • the heat exchange system according to an embodiment of the present disclosure may include a compressor 1 , a condenser 2 and an evaporator 3 connected in sequence, and an optional economizer 4 between the condenser 2 and the evaporator 3.
  • the compressor 1 includes an outlet 11 of the compressor and an inlet 12 of the compressor, the outlet 11 of the compressor is connected to an inlet 21 of the condenser 2 through a pipeline, and an outlet 22 of the condenser 2 is connected to the economizer 4 through a pipeline, and then connected to an inlet 31 of the evaporator; and an outlet 32 of the evaporator is connected to the inlet 12 of the compressor through a pipeline.
  • the condenser 2 and the evaporator 3 exchange heat with the environment or a coolant respectively, in order to adjust the temperature. It should be understood that the heat exchange system shown in the figure is only exemplary, and more components and devices such as pipelines may be included in practical applications.
  • the heat exchange system also includes a system for reclaiming corrosion inhibitor which includes an ejector 6 including a high-pressure fluid inlet 61 connected to the outlet 11 of the compressor 1, a suction fluid inlet 62 connected to the heat exchange system to extract a liquid-state refrigerant in the heat exchange system, and a fluid outlet 63 leading to bearings of the compressor 1.
  • a pressurizing device 5 is provided between the outlet 11 of the compressor and the high- pressure fluid inlet 61 of the ejector 6.
  • the outlet 11 of the compressor is connected to the pressurizing device 5, and the pressurizing device 5 is connected to the high-pressure fluid inlet 61 of the ejector 6.
  • the pressurizing device 5 is connected to a certain position 13 on a pipeline between the outlet 11 of the compressor and the inlet 21 of the condenser 2.
  • the suction fluid inlet 62 of the ejector 6 may be connected to any suitable position in the heat exchange system to extract a liquid-state refrigerant.
  • the suction fluid inlet 62 of the ejector 6 is connected to a bottom of the evaporator 3 to extract a liquid-state refrigerant mixed with corrosion inhibitor in the evaporator. It should be understood that during the use of the heat exchange system, the corrosion inhibitor in a bearing chamber of the compressor will be gradually mixed into the refrigerant to participate in the refrigeration cycle.
  • the fluid outlet 63 of the ejector 6 leads to the bearings of the compressor 1 through a pipeline, such as to a bearing chamber, i.e., the outlet of the pipeline may, for example, be aligned with the bearing chamber of the compressor 1 so that the corrosion inhibitor can be applied to the bearings.
  • a filter may be arranged on a pipeline connecting the fluid outlet 63 of the ejector 6 and the bearing chamber of the compressor to prevent foreign matters from entering the bearing chamber of the compressor.
  • the pipelines of the system for reclaiming corrosion inhibitor may be copper pipes.
  • a part of the high-pressure fluid discharged from the compressor 1 enters the high-pressure fluid inlet 61 of the ejector 6 through the pressurizing device 5 to produce a pressure difference between the ejector 6 and the evaporator 3, so that a liquid-state refrigerant mixed with corrosion inhibitor is extracted from the evaporator 3.
  • the high-pressure fluid from the compressor 1 and the liquid-state refrigerant from the evaporator 3 are mixed in the ejector 6 and led to the bearings of the compressor 1 through the fluid outlet 63 of the ejector 6 to reclaim part of the corrosion inhibitor to the bearings of the compressor.
  • the above-mentioned corrosion inhibitor reclaim circuit keeps running during the working process of the thermal cycle system so as to keep sufficient corrosion inhibitor at the bearings of the compressor 1 and avoid corrosion of the compressor bearings and compressor failures caused thereby.
  • a combination of the ejector and the pressurizing device is used to reclaim the corrosion inhibitor to the bearing chamber of the compressor.
  • the pump is prone to cavitation since the extracted refrigerant is in a gas-liquid mixed state.
  • the pressurizing device 5 ensures that the high-pressure fluid inlet 61 of the ejector 6 is always under high pressure, so that a continuous corrosion inhibitor can be passed to the bearing chamber of the compressor even when the pressure at the outlet 11 of the compressor 1 is low.
  • the pressurizing device 5 may be a pump, such as a small pump. In some embodiments, the pressurizing device 5 may also be an additional compressor, which has a significantly lower power than the compressor 1. In an alternative embodiment, the pressurizing device 5 can be any existing suitable pressurizing device.
  • the suction fluid inlet 62 may also be connected to a bottom of the economizer 4 (if any) to extract a liquid-state refrigerant with corrosion inhibitor from the economizer 4. In some other embodiments, the suction fluid inlet 62 may also be connected to other components in the heat exchange system, as long as the liquid-state refrigerant mixed with the corrosion inhibitor is accumulated in the component. Preferably, the suction fluid inlet 62 is connected to the bottom of the evaporator, since the pressure there is relatively low.
  • the compressor 1 may be a centrifugal compressor and the corrosion inhibitor may be oil.
  • the present disclosure also provides a method for reclaiming corrosion inhibitor in a heat exchange system, the method including: providing an ejector in the heat exchange system, connecting a high-pressure fluid inlet of the ejector to an outlet of the compressor, connecting a suction fluid inlet of the ejector to the heat exchange system to extract a liquid-state refrigerant in the heat exchange system, and leading a fluid outlet of the ejector to bearings of the compressor, wherein the method further includes: providing a pressurizing device between the high-pressure fluid inlet of the ejector and the outlet of the compressor.
  • the pressurizing device may be a pump or an additional compressor.
  • the method may include connecting the suction fluid inlet to a bottom of the evaporator to extract a liquid-state refrigerant with corrosion inhibitor. In some embodiments, the method may include connecting the suction fluid inlet to a bottom of an economizer between the condenser and the evaporator to extract the liquid-state refrigerant with corrosion inhibitor.
  • the compressor may be a centrifugal compressor and the corrosion inhibitor may be oil.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Power Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

A heat exchange system and a method for reclaiming corrosion inhibitor in a heat exchange system are provided by the present disclosure. The heat exchange system includes a compressor (1), a condenser (2) and an evaporator (3) connected in sequence, and the heat exchange system further includes a system for reclaiming corrosion inhibitor which includes an ejector (6) including a high-pressure fluid inlet (61) connected to an outlet (11) of the compressor, a suction fluid inlet (62) connected to the heat exchange system to extract a liquid-state refrigerant in the heat exchange system, and a fluid outlet (63) leading to bearings of the compressor, wherein a pressurizing device (5) is provided between the outlet of the compressor and the high-pressure fluid inlet of the ejector. The heat exchange system according to the embodiments of the present disclosure can provide sufficient corrosion inhibitor to the bearings of the compressor under various working conditions.

Description

HEAT EXCHANGE SYSTEM AND METHOD FOR RECLAIMING CORROSION INHIBITOR IN HEAT EXCHANGE SYSTEM
FIELD OF THE INVENTION
[001] The present disclosure relates to a heat exchange system, and more particularly to a device and a method for reclaiming corrosion inhibitor in a heat exchange system.
BACKGROUND OF THE INVENTION
[002] In heat exchange systems, such as refrigeration systems, since a bearing chamber of compressor is unsealed, the corrosion inhibitor such as oil therein will gradually flow out and mix with refrigerant, enter a refrigeration cycle with the refrigerant, and may accumulate in a liquid-phase refrigerant, such as in an evaporator. Therefore, a system for reclaiming corrosion inhibitor is required in the heat exchange system to return the corrosion inhibitor back to the bearing chamber of the compressor. A pump may be used in existing systems to extract a liquid-state refrigerant mixed with corrosion inhibitor, but cavitation will occur when the pump is exposed to the refrigerant in a gas-liquid phase.
SUMMARY OF THE INVENTION
[003] The object of the present disclosure is to solve or at least alleviate the problems existing in the related art.
[004] In one aspect, a heat exchange system is provided, which includes: a compressor, a condenser and an evaporator connected in sequence, wherein the heat exchange system further includes a system for reclaiming corrosion inhibitor, the system for reclaiming corrosion inhibitor including:
an ejector including a high-pressure fluid inlet connected to an outlet of the compressor, a suction fluid inlet connected to the heat exchange system to extract a liquid- state refrigerant in the heat exchange system, and a fluid outlet leading to bearings of the compressor, wherein a pressurizing device is provided between the outlet of the compressor and the high-pressure fluid inlet of the ejector.
[005] Optionally, in an embodiment of the heat exchange system, the pressurizing device is a pump or an additional compressor. [006] Optionally, in an embodiment of the heat exchange system, the suction fluid inlet is connected to a bottom of the evaporator to extract a liquid- state refrigerant with corrosion inhibitor.
[007] Optionally, in an embodiment of the heat exchange system, the heat exchange system further includes an economizer connected between the condenser and the evaporator, and the suction fluid inlet is connected to a bottom of the economizer to extract a liquid-state refrigerant with corrosion inhibitor.
[008] Optionally, in an embodiment of the heat exchange system, the compressor is a centrifugal compressor, and the corrosion inhibitor is oil.
[009] In another aspect, a method for reclaiming corrosion inhibitor in a heat exchange system is provided, the heat exchange system including a compressor, a condenser and an evaporator connected in sequence, and the method including:
providing an ejector in the heat exchange system, connecting a high-pressure fluid inlet of the ejector to an outlet of the compressor, connecting a suction fluid inlet of the ejector to the heat exchange system to extract a liquid-state refrigerant in the heat exchange system, and leading a fluid outlet of the ejector to bearings of the compressor, wherein the method further includes: providing a pressurizing device between the outlet of the compressor and the high-pressure fluid inlet of the ejector.
[010] Optionally, the pressurizing device is a pump or an additional compressor.
[Oil] Optionally, the method includes connecting the suction fluid inlet to a bottom of the evaporator to extract a liquid-state refrigerant with corrosion inhibitor.
[012] Optionally, the method includes connecting the suction fluid inlet to a bottom of an economizer between the condenser and the evaporator to extract a liquid-state refrigerant with corrosion inhibitor.
[013] Optionally, the compressor is a centrifugal compressor, and the corrosion inhibitor is oil.
[014] The heat exchange system according to the embodiments of the present disclosure can provide sufficient corrosion inhibitor to the bearings of the compressor under various working conditions.
BRIEF DESCRIPTION OF THE DRAWINGS
[015] The contents of the present disclosure will become easier to understand with reference to the accompanying drawings. It can be easily understood by those skilled in the art that the drawings are merely used for illustration, and are not intended to limit the scope of protection of the present disclosure. In addition, like parts are denoted by like numerals in the drawings, wherein:
FIG. 1 shows a schematic structural view of a heat exchange system according to an embodiment of the present disclosure.
DETAILED DESCRIPTION OF THE EMBODIMENT(S) OF THE INVENTION
[016] It will be readily understood that, based on the technical solutions of the present disclosure, those skilled in the art can propose various alternative structural forms and implementations without departing from the true spirit of the present disclosure. Therefore, the following specific embodiments and the accompanying drawings are merely exemplary description of the technical solutions of the present disclosure, which shall not be deemed as the entirety of the present disclosure or as limiting or restricting the technical solutions of the present disclosure.
[017] Such orientational terms as“upper”,“lower”,“left”,“right”,“front”,“rear”, “front side”,“back side”,“top”,“bottom” or the like that are mentioned or may be mentioned in this description are defined with respect to the configurations shown in the individual drawings. They are relative concepts and thus possibly vary according to their different locations or different states of use. Therefore, these or other orientational terms shall not be interpreted as limiting terms.
[018] A heat exchange system according to an embodiment of the present disclosure will be described in detail with reference to FIG. 1. The heat exchange system according to the embodiment of the present disclosure may include a compressor 1 , a condenser 2 and an evaporator 3 connected in sequence, and an optional economizer 4 between the condenser 2 and the evaporator 3. More specifically, the compressor 1 includes an outlet 11 of the compressor and an inlet 12 of the compressor, the outlet 11 of the compressor is connected to an inlet 21 of the condenser 2 through a pipeline, and an outlet 22 of the condenser 2 is connected to the economizer 4 through a pipeline, and then connected to an inlet 31 of the evaporator; and an outlet 32 of the evaporator is connected to the inlet 12 of the compressor through a pipeline. The condenser 2 and the evaporator 3 exchange heat with the environment or a coolant respectively, in order to adjust the temperature. It should be understood that the heat exchange system shown in the figure is only exemplary, and more components and devices such as pipelines may be included in practical applications.
[019] The heat exchange system also includes a system for reclaiming corrosion inhibitor which includes an ejector 6 including a high-pressure fluid inlet 61 connected to the outlet 11 of the compressor 1, a suction fluid inlet 62 connected to the heat exchange system to extract a liquid-state refrigerant in the heat exchange system, and a fluid outlet 63 leading to bearings of the compressor 1. In the system for reclaiming corrosion inhibitor, a pressurizing device 5 is provided between the outlet 11 of the compressor and the high- pressure fluid inlet 61 of the ejector 6. In the embodiment shown in the figure, the outlet 11 of the compressor is connected to the pressurizing device 5, and the pressurizing device 5 is connected to the high-pressure fluid inlet 61 of the ejector 6. Specifically, the pressurizing device 5 is connected to a certain position 13 on a pipeline between the outlet 11 of the compressor and the inlet 21 of the condenser 2. The suction fluid inlet 62 of the ejector 6 may be connected to any suitable position in the heat exchange system to extract a liquid-state refrigerant. As a non-limiting example, the suction fluid inlet 62 of the ejector 6 is connected to a bottom of the evaporator 3 to extract a liquid-state refrigerant mixed with corrosion inhibitor in the evaporator. It should be understood that during the use of the heat exchange system, the corrosion inhibitor in a bearing chamber of the compressor will be gradually mixed into the refrigerant to participate in the refrigeration cycle. Most of the corrosion inhibitor will accumulate in the liquid-state refrigerant such as in the evaporator. Therefore, the ejector 6 can draw the corrosion inhibitor back to the bearing chamber of compressor. The fluid outlet 63 of the ejector 6 leads to the bearings of the compressor 1 through a pipeline, such as to a bearing chamber, i.e., the outlet of the pipeline may, for example, be aligned with the bearing chamber of the compressor 1 so that the corrosion inhibitor can be applied to the bearings. A filter may be arranged on a pipeline connecting the fluid outlet 63 of the ejector 6 and the bearing chamber of the compressor to prevent foreign matters from entering the bearing chamber of the compressor. In addition, it should be noted that the pipelines of the system for reclaiming corrosion inhibitor may be copper pipes.
[020] During operation, a part of the high-pressure fluid discharged from the compressor 1 enters the high-pressure fluid inlet 61 of the ejector 6 through the pressurizing device 5 to produce a pressure difference between the ejector 6 and the evaporator 3, so that a liquid-state refrigerant mixed with corrosion inhibitor is extracted from the evaporator 3. The high-pressure fluid from the compressor 1 and the liquid-state refrigerant from the evaporator 3 are mixed in the ejector 6 and led to the bearings of the compressor 1 through the fluid outlet 63 of the ejector 6 to reclaim part of the corrosion inhibitor to the bearings of the compressor. The above-mentioned corrosion inhibitor reclaim circuit keeps running during the working process of the thermal cycle system so as to keep sufficient corrosion inhibitor at the bearings of the compressor 1 and avoid corrosion of the compressor bearings and compressor failures caused thereby. In the embodiment of the present disclosure, a combination of the ejector and the pressurizing device is used to reclaim the corrosion inhibitor to the bearing chamber of the compressor. By contrast, in a traditional solution of directly using a pump to extract a refrigerant mixed with corrosion inhibitor, the pump is prone to cavitation since the extracted refrigerant is in a gas-liquid mixed state. In addition, the pressurizing device 5 ensures that the high-pressure fluid inlet 61 of the ejector 6 is always under high pressure, so that a continuous corrosion inhibitor can be passed to the bearing chamber of the compressor even when the pressure at the outlet 11 of the compressor 1 is low.
[021] In some embodiments, the pressurizing device 5 may be a pump, such as a small pump. In some embodiments, the pressurizing device 5 may also be an additional compressor, which has a significantly lower power than the compressor 1. In an alternative embodiment, the pressurizing device 5 can be any existing suitable pressurizing device. In some embodiments, the suction fluid inlet 62 may also be connected to a bottom of the economizer 4 (if any) to extract a liquid-state refrigerant with corrosion inhibitor from the economizer 4. In some other embodiments, the suction fluid inlet 62 may also be connected to other components in the heat exchange system, as long as the liquid-state refrigerant mixed with the corrosion inhibitor is accumulated in the component. Preferably, the suction fluid inlet 62 is connected to the bottom of the evaporator, since the pressure there is relatively low. In some embodiments, the compressor 1 may be a centrifugal compressor and the corrosion inhibitor may be oil.
[022] In another aspect, the present disclosure also provides a method for reclaiming corrosion inhibitor in a heat exchange system, the method including: providing an ejector in the heat exchange system, connecting a high-pressure fluid inlet of the ejector to an outlet of the compressor, connecting a suction fluid inlet of the ejector to the heat exchange system to extract a liquid-state refrigerant in the heat exchange system, and leading a fluid outlet of the ejector to bearings of the compressor, wherein the method further includes: providing a pressurizing device between the high-pressure fluid inlet of the ejector and the outlet of the compressor. In some embodiments, the pressurizing device may be a pump or an additional compressor. In some embodiments, the method may include connecting the suction fluid inlet to a bottom of the evaporator to extract a liquid-state refrigerant with corrosion inhibitor. In some embodiments, the method may include connecting the suction fluid inlet to a bottom of an economizer between the condenser and the evaporator to extract the liquid-state refrigerant with corrosion inhibitor. In some embodiments, the compressor may be a centrifugal compressor and the corrosion inhibitor may be oil.
[023] The specific embodiments described above are merely for describing the principle of the present disclosure more clearly, and various components are clearly illustrated or depicted to make it easier to understand the principle of the present disclosure. Those skilled in the art can readily make various modifications or changes to the present disclosure without departing from the scope of the present disclosure. Therefore, it should be understood that these modifications or changes should be included within the scope of protection of the present disclosure.

Claims

What is claimed is:
1. A heat exchange system, comprising: a compressor, a condenser and an evaporator connected in sequence, wherein the heat exchange system further comprises a system for reclaiming corrosion inhibitor, the system for reclaiming corrosion inhibitor comprising: an ejector comprising a high-pressure fluid inlet connected to an outlet of the compressor, a suction fluid inlet connected to the heat exchange system to extract a liquid- state refrigerant in the heat exchange system, and a fluid outlet leading to bearings of the compressor, wherein a pressurizing device is provided between the outlet of the compressor and the high-pressure fluid inlet of the ejector.
2. The heat exchange system according to claim 1 , wherein the pressurizing device is a pump or an additional compressor.
3. The heat exchange system according to claim 1, wherein the suction fluid inlet is connected to a bottom of the evaporator to extract a liquid-state refrigerant with corrosion inhibitor.
4. The heat exchange system according to claim 1, wherein the heat exchange system further comprises an economizer connected between the condenser and the evaporator, and the suction fluid inlet is connected to a bottom of the economizer to extract a liquid- state refrigerant with corrosion inhibitor.
5. The heat exchange system according to claim 1, wherein the compressor is a centrifugal compressor, and the corrosion inhibitor is oil.
6. A method for reclaiming corrosion inhibitor in a heat exchange system, the heat exchange system comprising a compressor, a condenser and an evaporator connected in sequence, and the method comprising:
providing an ejector in the heat exchange system, connecting a high-pressure fluid inlet of the ejector to an outlet of the compressor, connecting a suction fluid inlet of the ejector to the heat exchange system to extract a liquid-state refrigerant in the heat exchange system, and leading a fluid outlet of the ejector to bearings of the compressor, wherein the method further comprises: providing a pressurizing device between the outlet of the compressor and the high-pressure fluid inlet of the ejector.
7. The method according to claim 6, wherein the pressurizing device is a pump or an additional compressor.
8. The method according to claim 6, wherein the method comprises connecting the suction fluid inlet to a bottom of the evaporator to extract a liquid- state refrigerant with corrosion inhibitor.
9. The method according to claim 6, wherein the method comprises connecting the suction fluid inlet to a bottom of an economizer between the condenser and the evaporator to extract a liquid-state refrigerant with corrosion inhibitor.
10. The method according to claim 6, wherein the compressor is a centrifugal compressor, and the corrosion inhibitor is oil.
PCT/US2020/032598 2019-05-17 2020-05-13 Heat exchange system and method for reclaiming corrosion inhibitor in heat exchange system Ceased WO2020236472A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US17/252,927 US11946673B2 (en) 2019-05-17 2020-05-13 Heat exchange system and method for reclaiming corrosion inhibitor in heat exchange system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201910411632.XA CN111947356B (en) 2019-05-17 2019-05-17 Heat exchange system and preservative recovery method in heat exchange system
CN201910411632.X 2019-05-17

Publications (1)

Publication Number Publication Date
WO2020236472A1 true WO2020236472A1 (en) 2020-11-26

Family

ID=70919205

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2020/032598 Ceased WO2020236472A1 (en) 2019-05-17 2020-05-13 Heat exchange system and method for reclaiming corrosion inhibitor in heat exchange system

Country Status (3)

Country Link
US (1) US11946673B2 (en)
CN (1) CN111947356B (en)
WO (1) WO2020236472A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2841962A (en) * 1957-01-23 1958-07-08 H A Phillips Return apparatus for a two-stage refrigeration system
DD133063A1 (en) * 1977-09-13 1978-11-29 Achim Franke DEVICE FOR OIL RECEPTION FROM AN OVERFLOWING WORKING EVAPORATOR
US4558573A (en) * 1983-09-30 1985-12-17 Samifi Babcock, S.P.A. Device for oil cooling in a compression unit and, particularly, a screw compression unit
US4938664A (en) * 1989-11-13 1990-07-03 Carrier Corporation Oil reclaim system
EP1119732A1 (en) * 1998-10-09 2001-08-01 American Standard Inc. Liquid chiller with enhanced motor cooling and lubrication

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE133063C (en)
KR100374167B1 (en) * 2000-05-31 2003-03-04 엘지전자 주식회사 The refrigerating system with bypass
JP2007232353A (en) * 2006-01-04 2007-09-13 Japan Energy Corp Centrifugal compression refrigerator and lubricating oil used therefor
EP2499442A2 (en) * 2009-09-06 2012-09-19 Ben-gurion University Of The Negev Research And Development Authority Air cooled absorption cooling system operable by low grade heat
US20120324911A1 (en) * 2011-06-27 2012-12-27 Shedd Timothy A Dual-loop cooling system
US10935286B2 (en) * 2011-09-30 2021-03-02 Carrier Corporation High efficiency refrigeration system
US9032754B2 (en) * 2012-03-22 2015-05-19 Trane International Inc. Electronics cooling using lubricant return for a shell-and-tube evaporator
CN103322729B (en) * 2012-03-23 2015-12-02 珠海格力电器股份有限公司 Refrigerating system and air conditioner
CN205014684U (en) * 2015-09-17 2016-02-03 浙江新洲制冷科技有限公司 Draw and penetrate return oil system
US10746441B2 (en) * 2016-03-07 2020-08-18 Daikin Applied Americas Inc. Heat exchanger

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2841962A (en) * 1957-01-23 1958-07-08 H A Phillips Return apparatus for a two-stage refrigeration system
DD133063A1 (en) * 1977-09-13 1978-11-29 Achim Franke DEVICE FOR OIL RECEPTION FROM AN OVERFLOWING WORKING EVAPORATOR
US4558573A (en) * 1983-09-30 1985-12-17 Samifi Babcock, S.P.A. Device for oil cooling in a compression unit and, particularly, a screw compression unit
US4938664A (en) * 1989-11-13 1990-07-03 Carrier Corporation Oil reclaim system
EP1119732A1 (en) * 1998-10-09 2001-08-01 American Standard Inc. Liquid chiller with enhanced motor cooling and lubrication

Also Published As

Publication number Publication date
CN111947356B (en) 2024-08-16
CN111947356A (en) 2020-11-17
US20220065502A1 (en) 2022-03-03
US11946673B2 (en) 2024-04-02

Similar Documents

Publication Publication Date Title
US10274233B2 (en) Refrigerant cooling and lubrication system with refrigerant source access from an evaporator
EP3118542B1 (en) Refrigerating cycle device
JP4393711B2 (en) Liquid chiller with improved motor cooling and lubrication
US9976783B2 (en) Refrigeration cycle apparatus
US20230384008A1 (en) Refrigeration system
CN105074357A (en) Oil management for heating ventilation and air conditioning system
JP2009257684A (en) Compression refrigerating machine and method for recovering lubricating oil for the same
CN104236169A (en) Oil return control method of full fixed frequency multi-line
KR101564611B1 (en) Ejector type Refrigeration cycle
US11946673B2 (en) Heat exchange system and method for reclaiming corrosion inhibitor in heat exchange system
CN103471302A (en) Liquid cooling source with wide-temperature-range liquid supply
KR20150071874A (en) Turbo chiller
KR101993204B1 (en) Chiller apparatus for semiconductor process
JP2018503053A5 (en)
JPH02133758A (en) Refrigerating machine
TWI575208B (en) Pressure control for refrigerant system
JP2012047152A (en) Rankine cycle apparatus
CN209230055U (en) A kind of automatically controlled cooling-water machine of water cooling with dual-cycle plant
JPH10220885A (en) Refrigerating machine
CN105937856A (en) Industrial refrigerating machine with impact-resistant energy storage heat sink
JPH0583666U (en) Refrigeration equipment
JP6630627B2 (en) Turbo refrigerator
JP2014190216A (en) Waste heat regeneration system
KR101256583B1 (en) Oil recovery system for centrifugal chiller
CN223193327U (en) Refrigerating system

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20729516

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20729516

Country of ref document: EP

Kind code of ref document: A1