CN101487470A - Double-machine two-stage screw type low-temperature compressor unit - Google Patents

Double-machine two-stage screw type low-temperature compressor unit Download PDF

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Publication number
CN101487470A
CN101487470A CNA2008102369231A CN200810236923A CN101487470A CN 101487470 A CN101487470 A CN 101487470A CN A2008102369231 A CNA2008102369231 A CN A2008102369231A CN 200810236923 A CN200810236923 A CN 200810236923A CN 101487470 A CN101487470 A CN 101487470A
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China
Prior art keywords
pressure stage
stage compressor
oil
compressor
valve
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Pending
Application number
CNA2008102369231A
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Chinese (zh)
Inventor
余金龙
余凯
周国珍
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WUHAN KAILONG TECHNOLOGY DEVELOPMENT Co Ltd
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WUHAN KAILONG TECHNOLOGY DEVELOPMENT Co Ltd
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Priority to CNA2008102369231A priority Critical patent/CN101487470A/en
Publication of CN101487470A publication Critical patent/CN101487470A/en
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Abstract

A two-machine two-stage screw low-temperature compressor unit at least consists of parts, such as check-stop valves (1) (11) (33) (56) (58), a low pressure stage compressor (2A), a high pressure stage compressor (2B), an oil separator/oil separation cooler (3A), an oil feed line (29), a check valve (30), an energy control line (31), safety valves (12) (32), a condenser/evaporative condenser (40), stop valves (3) (14) (26) (28) (42) (54), filters (27) (43), an evaporator (51), a throttle valve (52), solenoid valves (53) (55) (63), expansion valves (57) (62) (64) and an intercooler/economizer (61) and the like which are connected by tubes, as well as an electric control cabinet (8), drive motors (81) (82) and couplings (83) (84). The exhaust air of the low pressure stage compressor (2A) directly enters the high pressure stage compressor (2B); the solenoid valve (55) and the expansion valves (57) (64) which are connected at an outlet of the filter (43) jet refrigerant liquid to the low pressure stage compressor (2A) and the high pressure stage compressor (2B); the intercooler/economizer (61), the expansion valve (62) and the solenoid valve (63) which are connected at the outlet of the filter (43) supply low-temperature refrigerant vapor to an exhaust line of the low pressure stage compressor (2A) or an air supply inlet of the high pressure stage compressor (2B), and also supply supercooling refrigerant liquid to a liquid supply line of the evaporator (51). The machine unit is not internally provided with an external oil cooler (21) and an oil pump (25), thus improving operation reliability and low-temperature energy efficiency ratio, and lowering cost.

Description

The double-machine two-stage screw type low-temperature compressor bank
Affiliated technical field
The present invention relates to the screw type low-temperature compressor bank of air-conditioning and refrigerating field, particularly a kind of double-machine two-stage screw type low-temperature compressor bank.
Background technique
Single stage screw formula cryogenic compressor group usually as Fig. 3 by non-return stop valve (1) (11) (24), screw compressor (2), external oil separator (13), safety valve (12), scavenger valve (3) (14), external oil cooler (21), stop valve (22) (26) (28) (42), oil strainer (23), olein filter (27), oil pump (25), oil feed line (29), one-way valve (30), energy pilot line (31), condenser (41), filter (43), vaporizer (51), throttle valve (52), solenoid valve component such as (53) connect to form by pipeline.Screw compressor (2) has single screw type and double-screw type.The screw type low-temperature compressor bank has screw-type water chiller, screw type salt solution unit, screw type buck unit, screw type ethylene glycol unit etc. usually, is widely used in large-scale central air-conditioner and industrial refrigeration field.
Single stage screw formula cryogenic compressor group is carried out following refrigeration cycle: screw compressor (2) sucks low pressure refrigerant vapor from vaporizer (51), through overcompression refrigerant vapour pressure is raise, simultaneously, to screw compressor (2) the lubricant oil that supplies also be discharged to external oil separator (13) together with the refrigeration agent high pressure steam, in external oil separator (13) process Oil-gas Separation, lubricant oil enters the oil circulation system, the refrigeration agent high pressure steam then enters condenser (41), in condenser (41), the refrigeration agent high pressure steam is emitted the heat medium that is cooled and is condensed into high pressure refrigerant liquid, the throttling of high pressure refrigerant liquid process throttle valve (52) makes pressure be lowered into low pressure refrigerant liquid and enters vaporizer (51), absorb the heat of cold carrying agent and explosive evaporation becomes low pressure refrigerant vapor at vaporizer (51) low pressure refrigerant liquid, low pressure refrigerant vapor is sucked by screw compressor (2) again, thereby finishes refrigeration cycle.Cold carrying agent reduces its temperature owing to emitting heat, and the cold carrying agent of low temperature is sent to the place that needs cold.Cold carrying agent can be to be higher than 0 ℃ water, or is lower than 0 ℃ salt solution, buck or non freezing solution.
In order to reduce screw compressor (2) delivery temperature, canned rotor profile, to reduce reasons such as noise and lubricating bearings, must be to the circulating lubricating oil of compressor chamber for 1% theoretical volume flow, screw compressor (2) must configuration one cover oil circulation system for this reason.Because the oil circulation system must separate with gas path circulatory system, as external oil separator (13) is set; Temperature raises because lubricant oil absorbs the heat of compression and frictional heat, and circulating lubricating oil must be through supercooling, as external oil cooler (21) is set; Owing to, as oil pump (25) is set for the reliable startup and the oil circulation of screw compressor (2).
The setting of external oil cooler (21) and oil pump (25) makes that screw type low-temperature compressor bank system is huge, complicated operation, fault point increase, reliability reduces.
Under 40/-40 ℃ of operating mode, Energy Efficiency Ratio<1 of single stage screw formula cryogenic compressor group, Energy Efficiency Ratio<1.5 of single-stage band economizer screw type low-temperature compressor bank, the Energy Efficiency Ratio of two-stage screw type low-temperature compressor bank can reach about 2, and the low temperature Energy Efficiency Ratio of visible single stage screw formula cryogenic compressor group is relatively poor.
Summary of the invention
For the screw type low-temperature compressor bank that solves prior art is provided with external oil cooler (21) and oil pump (25), have that system is huge, complicated operation, the defective that increases the fault point, reliability reduces, the low temperature Energy Efficiency Ratio is relatively poor, the screw compressor design and manufacturing technology that utilization improves constantly, ejector refrigeration agent liquid technology, make the double-machine two-stage screw type low-temperature compressor bank not contain external oil cooler (21) and oil pump (25), thoroughly eradicate these equipment the fault that may occur and improve the low temperature Energy Efficiency Ratio.
The technical solution adopted for the present invention to solve the technical problems is: at least by non-return stop valve (1) (11) (33) (56) (58), low pressure stage compressor (2A), high pressure stage compressor (2B), oil separator/oil separates cooler (3A), oil feed line (29), one-way valve (30), energy pilot line (31), safety valve (12) (32), condenser/evaporative condenser (40), stop valve (3) (14) (26) (28) (42) (54), filter (27) (43), vaporizer (51), throttle valve (52), solenoid valve (53) (55) (63), expansion valve (57) (62) (64), interstage cooler/economizer component such as (61) connect and electrical control cabinet (8) by pipeline, drive motor (81) (82), coupling (83) (84) is formed, the exhaust of low pressure stage compressor (2A) directly enters high pressure stage compressor (2B), and safety valve (32) is installed on this gas exhaust piping; The exhaust of high pressure stage compressor (2B) enters condenser/evaporative condenser (40) after oil separator/oil separates cooler (3A) separation; The solenoid valve (55) and the expansion valve (57) (64) that are connected in filter (43) outlet constitute to low pressure stage compressor (2A), high pressure stage compressor (2B) ejector refrigeration agent liquid; Interstage cooler/economizer (61), expansion valve (62) and the solenoid valve (63) that is connected in filter (43) outlet constitutes one side to the gas exhaust piping of low pressure stage compressor (2A) or to the gas supplementing opening transporting low temperature refrigerant vapour of high pressure stage compressor (2B), carries cold refrigerant liquid to the feed flow pipeline of vaporizer (51) on the other hand.
Do not contain external oil cooler (21) and oil pump (25) in the unit, improved operational reliability, provide cost savings.
The invention has the beneficial effects as follows: the screw type low-temperature compressor bank that has overcome prior art exists because of being provided with external oil cooler (21) and oil pump (25) that system is huge, complicated operation, the defective that increases the fault point, reliability reduces, the low temperature Energy Efficiency Ratio is relatively poor, system simplification, easy and simple to handle, fault point minimizing, reliability and Energy Efficiency Ratio are improved, provide cost savings.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is the system flow chart of a double-machine two-stage screw type low-temperature compressor bank of the present invention.
Fig. 2 is the system flow chart of a double-machine two-stage band economizer screw type low-temperature compressor bank of the present invention.
Fig. 3 is the system flow chart of a screw type low-temperature compressor bank of prior art.
Fig. 4 is the embodiment of a double-machine two-stage band economizer screw type low-temperature compressor bank of the present invention.
Among the figure: 1.11.24.33.56.58.59 non-return stop valve, 2. screw type refrigerating compressor, 2A. low pressure stage compressor, 2B. the high pressure stage compressor, 13 external oil separators, 3A. oil separator/oil separates cooler, 12.32 safety valve, 3.14. scavenger valve, 21. external oil coolers, 22.26.28.42.54. stop valve, 23. oil strainers, 27. olein filters, 25 oil pumps, 29. oil feed line, 4.30. one-way valve, 31. energy pilot line, 40. condenser/evaporative condenser, 41. condenser, 43. filters, 51. vaporizers, 52. throttle valve, 53.55.63.73 solenoid valve, 57.62.64.72. expansion valve, 61. interstage coolers, 71. economizer, 8. electrical control cabinet, 81.82. drive motor, 83.84 coupling.
Embodiment
In the system flow chart of a double-machine two-stage screw type low-temperature compressor bank shown in Figure 1, at least by non-return stop valve (1) (11) (33) (56) (58), low pressure stage compressor (2A), high pressure stage compressor (2B), oil separator/oil separates cooler (3A), oil feed line (29), one-way valve (30), energy pilot line (31), safety valve (12) (32), condenser/evaporative condenser (40), stop valve (3) (14) (26) (28) (42) (54), filter (27) (43), vaporizer (51), throttle valve (52), solenoid valve (53) (55) (63), expansion valve (57) (62) (64), interstage cooler/economizer component such as (61) connect and electrical control cabinet (8) by pipeline, drive motor (81) (82), coupling (83) (84) is formed, the exhaust of low pressure stage compressor (2A) directly enters high pressure stage compressor (2B), and safety valve (32) is installed on this gas exhaust piping; The exhaust of high pressure stage compressor (2B) enters condenser/evaporative condenser (40) after oil separator/oil separates cooler (3A) separation; The solenoid valve (55) and the expansion valve (57) (64) that are connected in filter (43) outlet constitute to low pressure stage compressor (2A), high pressure stage compressor (2B) ejector refrigeration agent liquid; Interstage cooler/economizer (61), expansion valve (62) and the solenoid valve (63) that is connected in filter (43) outlet constitutes one side to the gas exhaust piping of low pressure stage compressor (2A) or to the gas supplementing opening transporting low temperature refrigerant vapour of high pressure stage compressor (2B), carries cold refrigerant liquid to the feed flow pipeline of vaporizer (51) on the other hand.
The double-machine two-stage screw type low-temperature compressor bank is carried out following refrigeration cycle: low pressure stage compressor (2A) sucks low pressure refrigerant vapor from vaporizer (51), through overcompression refrigerant vapour pressure is raise, simultaneously, to low pressure stage compressor (2A) the lubricant oil of confession and the low-temperature refrigerant steam that transports by interstage cooler/economizer (61) with together arrange to high pressure stage compressor (2B) after it mixes, through recompression refrigerant vapour pressure is raise again, simultaneously, to high pressure stage compressor (2B) together arrange to oil separator/oil after lubricant oil and its mixing of confession and separate cooler (3A), through Oil-gas Separation, lubricant oil enters the oil circulation system, the refrigeration agent high pressure steam enters condenser/evaporative condenser (40), emit the heat medium that is cooled at condenser/evaporative condenser (40) refrigeration agent high pressure steam and be condensed into high pressure refrigerant liquid, the throttling of high pressure refrigerant liquid process throttle valve (52) makes pressure be lowered into low pressure refrigerant liquid and enters vaporizer (51), absorb the heat of cold carrying agent and explosive evaporation becomes low pressure refrigerant vapor at vaporizer (51) low pressure refrigerant liquid, low pressure refrigerant vapor is sucked by low pressure stage compressor (2A) again, thereby finishes refrigeration cycle.
The double-machine two-stage screw type low-temperature compressor bank is carried out following oil circulation: low pressure stage compressor (2A) sucks low pressure refrigerant vapor from vaporizer (51), through overcompression refrigerant vapour pressure is raise, simultaneously, to low pressure stage compressor (2A) the lubricant oil of confession and the low-temperature refrigerant steam that transports by interstage cooler/economizer (61) with together arrange to high pressure stage compressor (2B) after it mixes, through recompression refrigerant vapour pressure is raise again, simultaneously, to high pressure stage compressor (2B) together arrange to oil separator/oil after lubricant oil and its mixing of confession and separate cooler (3A), through Oil-gas Separation, lubricant oil one tunnel is through stop valve (26), filter (27), stop valve (26), oil feed line (29) and energy pilot line (31), another road is through stop valve (14) and (3), inhaling, under the effect of exhaust pressure difference, lubricant oil enters each fuel feeding point of low pressure stage compressor (2A) and high pressure stage compressor (2B), enter the low voltage side of high pressure stage compressor (2B) then, again sucked by high pressure stage compressor (2B) with refrigerant vapour, compression, discharge, entering oil separator/oil separation cooler (3A) once more carries out Oil-gas Separation, thereby finishes oil circulation.
The frictional heat that the low pressure stage compressor (2A) of double-machine two-stage screw type low-temperature compressor bank and high pressure stage compressor (2B) are produced and the heat of compression are sprayed cooling and absorbing by high performance lubricant parameter and refrigerant liquid.The solenoid valve (55) and the expansion valve (57) (64) that are connected in filter (43) outlet constitute to low pressure stage compressor (2A), high pressure stage compressor (2B) ejector refrigeration agent liquid.
Low pressure stage compressor (2A), coupling (83) and drive motor (81) place oil separator/oil to separate on the cooler (3A), high pressure stage compressor (2B), coupling (84) and drive motor (82) place on interstage cooler/economizer (61), and whole unit is installed on the public base together with its circulation loop.
Fig. 2 is with the difference of Fig. 1: the supercooled liquid outlet of interstage cooler/economizer (61) also can be connected by economizer (71), the economizer pipeline that expansion valve (72) and solenoid valve (73) are formed, the process heat release is after cold refrigerant liquid direction of flow vaporizer (51), flow to the gas supplementing opening of low pressure stage compressor (2A) through the refrigerant vapour of heat absorption evaporation, because the setting of economizer pipeline, the cryogenic property of double-machine two-stage screw type low-temperature compressor bank improves greatly, the double-machine two-stage band economizer screw type low-temperature compressor bank of Gou Chenging thus can be applicable to-60 ℃ ultralow temperature place.
Fig. 4 is the specific embodiment of Fig. 1.The screw type low-temperature compressor bank that this double-machine two-stage screw type low-temperature compressor bank has overcome prior art exists because of being provided with external oil cooler (21) and oil pump (25) that system is huge, complicated operation, the defective that increases the fault point, reliability reduces, the low temperature Energy Efficiency Ratio is relatively poor, make that reduce system simplification, easy and simple to handle, fault point, reliability improves, low temperature Energy Efficiency Ratio good performance provides cost savings.

Claims (3)

1. double-machine two-stage screw type low-temperature compressor bank, at least by non-return stop valve (1) (11) (33) (56) (58), low pressure stage compressor (2A), high pressure stage compressor (2B), oil separator/oil separates cooler (3A), oil feed line (29), one-way valve (30), energy pilot line (31), safety valve (12) (32), condenser/evaporative condenser (40), stop valve (3) (14) (26) (28) (42) (54), filter (27) (43), vaporizer (51), throttle valve (52), solenoid valve (53) (55) (63), expansion valve (57) (62) (64), interstage cooler/economizer component such as (61) connect and electrical control cabinet (8) by pipeline, drive motor (81) (82), coupling (83) (84) is formed, do not contain external oil cooler (21) and oil pump (25) in the unit, it is characterized in that:
The exhaust of described low pressure stage compressor (2A) directly enters high pressure stage compressor (2B), and safety valve (32) is installed on this gas exhaust piping;
The exhaust of described high pressure stage compressor (2B) enters condenser/evaporative condenser (40) after oil separator/oil separates cooler (3A) separation;
Described non-return stop valve (33) is communicated with the intakeport of low pressure stage compressor (2A) and high pressure stage compressor (2B);
Described solenoid valve (55) and the expansion valve (57) (64) that is connected in filter (43) outlet constitutes to low pressure stage compressor (2A), high pressure stage compressor (2B) ejector refrigeration agent liquid;
Described interstage cooler/economizer (61), expansion valve (62) and the solenoid valve (63) that is connected in filter (43) outlet constitutes one side to the gas exhaust piping of low pressure stage compressor (2A) or to the gas supplementing opening transporting low temperature refrigerant vapour of high pressure stage compressor (2B), carries cold refrigerant liquid to the feed flow pipeline of vaporizer (51) on the other hand.
2. double-machine two-stage screw type low-temperature compressor bank according to claim 1, it is characterized in that: low pressure stage compressor (2A), coupling (83) and drive motor (81) place oil separator/oil to separate on the cooler (3A), high pressure stage compressor (2B), coupling (84) and drive motor (82) place on interstage cooler/economizer (61), and whole unit is installed on the public base together with its circulation loop.
3. according to claim 1,2 described double-machine two-stage screw type low-temperature compressor bank, it is characterized in that: the supercooled liquid outlet at interstage cooler/economizer (61) also can connect the economizer pipeline of being made up of economizer (71), expansion valve (72) and solenoid valve (73), after cold refrigerant liquid direction of flow vaporizer (51), flow to the gas supplementing opening of low pressure stage compressor (2A) through heat release through the refrigerant vapour of heat absorption evaporation.
CNA2008102369231A 2008-12-19 2008-12-19 Double-machine two-stage screw type low-temperature compressor unit Pending CN101487470A (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102937093A (en) * 2012-12-11 2013-02-20 南车戚墅堰机车有限公司 Novel air compressor for locomotive
CN103344058A (en) * 2013-06-26 2013-10-09 武汉新世界制冷工业有限公司 Method for improving operating efficiency of double-unit and double-stage screw refrigerating unit
CN103954066A (en) * 2014-04-15 2014-07-30 珠海格力电器股份有限公司 Refrigerating device
CN103954065A (en) * 2014-04-15 2014-07-30 珠海格力电器股份有限公司 Refrigerating device
CN104101124A (en) * 2013-04-09 2014-10-15 珠海格力电器股份有限公司 Air conditioner
WO2015158138A1 (en) * 2014-04-15 2015-10-22 珠海格力电器股份有限公司 Refrigeration device
CN105065268A (en) * 2015-08-14 2015-11-18 温岭市鑫磊空压机有限公司 Air compressor
CN111895682A (en) * 2020-07-10 2020-11-06 无锡职业技术学院 Air-cooled heat pump system adopting single-unit two-stage hybrid screw compressor
WO2021017677A1 (en) * 2019-07-29 2021-02-04 珠海格力电器股份有限公司 Compressor and air conditioning system

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102937093A (en) * 2012-12-11 2013-02-20 南车戚墅堰机车有限公司 Novel air compressor for locomotive
CN102937093B (en) * 2012-12-11 2015-06-24 南车戚墅堰机车有限公司 Novel air compressor for locomotive
CN104101124B (en) * 2013-04-09 2015-11-25 珠海格力电器股份有限公司 Air-conditioner
CN104101124A (en) * 2013-04-09 2014-10-15 珠海格力电器股份有限公司 Air conditioner
CN103344058A (en) * 2013-06-26 2013-10-09 武汉新世界制冷工业有限公司 Method for improving operating efficiency of double-unit and double-stage screw refrigerating unit
CN103954065A (en) * 2014-04-15 2014-07-30 珠海格力电器股份有限公司 Refrigerating device
WO2015158138A1 (en) * 2014-04-15 2015-10-22 珠海格力电器股份有限公司 Refrigeration device
CN103954066A (en) * 2014-04-15 2014-07-30 珠海格力电器股份有限公司 Refrigerating device
US10345011B2 (en) 2014-04-15 2019-07-09 Gree Electric Appliances, Inc. Of Zhuhai Refrigeration device
CN105065268A (en) * 2015-08-14 2015-11-18 温岭市鑫磊空压机有限公司 Air compressor
WO2021017677A1 (en) * 2019-07-29 2021-02-04 珠海格力电器股份有限公司 Compressor and air conditioning system
CN111895682A (en) * 2020-07-10 2020-11-06 无锡职业技术学院 Air-cooled heat pump system adopting single-unit two-stage hybrid screw compressor

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