CN203501543U

CN203501543U - Low-temperature air cooling screw rod cold-hot water set

Info

Publication number: CN203501543U
Application number: CN201320570166.8U
Authority: CN
Inventors: 朱国辉; 杨建敏; 梅敏华
Original assignee: Jiangxi Tsinghua Taihao Sanbo Motor Co Ltd
Current assignee: Jiangxi Tsinghua Taihao Sanbo Motor Co Ltd
Priority date: 2013-09-14
Filing date: 2013-09-14
Publication date: 2014-03-26
Anticipated expiration: 2023-09-14

Abstract

Provided is a low-temperature air cooling screw rod cold-hot water set including a gas-liquid separator, an oil filter, a stop valve I, an air-intake pressure transmitter, a screw rod compressor, a pressure balance pipe, a pressure maintaining valve, an exhaust temperature sensor, a four-way reversing valve, a solenoid valve IV, an exhaust bypass valve, a non return valve I, a non return valve II, a reservoir, a dry filter, sight glasses, a solenoid valve I, a solenoid valve II, a thermal expansion valve II, a thermal expansion valve III, a solenoid valve III, a thermal expansion valve I, an economizer, a non return valve III, a non return valve IV, a non return valve V, a stop valve II, a shell and tube heat exchanger, a waterway electrically operated valve, and an oil cooler. The low-temperature air cooling screw rod cold-hot water set can realize the refrigeration and heating functions of the set under the environment temperature of -20-43 DEG C, particularly a low-temperature environment. By arranging the economizer, the exhaust bypass valve, the oil cooler, the pressure maintaining valve and other parts, the safety and the reliability of the starting and the running of the compressor can be guaranteed, and the COP value during the heating running of the set can be increased.

Description

Low form air-cooled screw hot and cold water unit

Technical field

The utility model relates to a kind of low form air-cooled screw hot and cold water unit.

Background technology

The limiting value of common screw compressor evaporating temperature is-15 ℃, and during in environment temperature-5 ℃, unit evaporating temperature generally just can reach this limiting value, and its applicable ambient temperature range is-7 ℃ ~ 43 ℃.And the environment for use temperature range of low-temperature air-cooling hot and cold water unit is-20 ℃ ~ 43 ℃, for common screw compressor, if do not do innovation optimization in system, can not reach this requirement, safety, reliability when the improvement of at present carrying out structure for common screw compressor generally cannot guarantee compressor start, operation, the COP value in the time of more can not improving unit heating operation.

Summary of the invention

The purpose of this utility model is to provide a kind of low form air-cooled screw hot and cold water unit, and it has reached refrigeration and the heat-production functions of low temperature environment, and the requirement of stable and safe in operation.

The utility model is achieved like this, it comprises gas-liquid separator, oil strainer, stop valve I, pressure of inspiration(Pi) transmitter, helical-lobe compressor oil-out, helical-lobe compressor, helical-lobe compressor oil-in, helical-lobe compressor jet, pressure-equalizing pipe, pressure maintenance valve, exhaust gas temperature sensor, four-way change-over valve, magnetic valve IV, finned heat exchanger, blower fan, knockout, exhaust by-pass valve, check valve I, check valve II, reservoir, device for drying and filtering, liquid-sighting glass, magnetic valve I, magnetic valve II, heating power expansion valve II, heating power expansion valve III, magnetic valve III, heating power expansion valve I, economizer, check valve III, check valve IV, check valve V, stop valve II, case tube heat exchanger, water route motor-driven valve, oil cooler, the one end that it is characterized in that four-way change-over valve connects fin heat exchanger assembly, finned heat exchanger assembly You Si road finned heat exchanger and the pipeline being in series by knockout compose in parallel, finned heat exchanger assembly side arranges 4 blower fans, and finned heat exchanger assembly connects exhaust by-pass valve in parallel, check valve I and check valve II, check valve I is connected reservoir with after the parallel connection of check valve IV, reservoir connects device for drying and filtering, device for drying and filtering connects liquid-sighting glass, liquid-sighting glass connects magnetic valve I in parallel and the import of economizer major loop, magnetic valve I connects heating power expansion valve I, heating power expansion valve I connects the spray circuits import of economizer, the spray circuits outlet of economizer connects check valve V, check valve V connecting screw rod compressor jet, the outlet of economizer major loop connects magnetic valve II and magnetic valve III in parallel, magnetic valve II connects heating power expansion valve II, magnetic valve III connects heating power expansion valve III, parallel connection is connected check valve II in parallel and check valve III to heating power expansion valve II afterwards with heating power expansion valve III, check valve III is connected case tube heat exchanger with after the parallel connection of check valve IV, case tube heat exchanger connects one end of four-way change-over valve, four-way change-over valve intermediate ends connects gas-liquid separator, gas-liquid separator connecting screw rod compressor air suction mouth, between gas-liquid separator outlet and helical-lobe compressor air entry, pressure of inspiration(Pi) transmitter is installed, helical-lobe compressor exhaust outlet Bonding pressure maintains valve, the suction end Bonding pressure balance pipe of pressure maintenance valve and helical-lobe compressor, on pressure maintenance valve export pipeline, exhaust gas temperature sensor is set, exhaust gas temperature sensor connects four-way change-over valve one end and magnetic valve IV, magnetic valve IV connects exhaust by-pass valve, form refrigerant loop, helical-lobe compressor oil-out connects stop valve II, and stop valve II connects the oil circuit import of oil cooler, and the oil circuit outlet of oil cooler connects oil strainer, and oil strainer connects stop valve I, and stop valve I connecting screw rod compressor oil-in forms oil return line, air-conditioning water inlet pipe connects water route motor-driven valve and case tube heat exchanger in parallel, and water route motor-driven valve connects the water route import of oil cooler, and the water route outlet of oil cooler is connected air-conditioner water outlet pipe with after case tube heat exchanger parallel connection, forms water loop.

Technique effect of the present utility model is: the utility model can be under-20 ℃ ~ 43 ℃ environment temperatures, refrigeration and the heat-production functions of unit have been realized, particularly under low temperature environment, by the parts such as economizer, exhaust by-pass valve, oil cooler and pressure maintenance valve are set in system, safety, reliability while having guaranteed compressor start, operation, the COP value while having improved unit heating operation.

Accompanying drawing explanation

Fig. 1 is structural representation of the present utility model.

In the drawings, 1, gas-liquid separator 2, oil strainer 3, stop valve I 4, pressure of inspiration(Pi) transmitter 5, helical-lobe compressor oil-out 6, helical-lobe compressor 7, helical-lobe compressor oil filler 8, helical-lobe compressor jet 9, pressure-equalizing pipe 10, pressure maintenance valve 11, exhaust gas temperature sensor 12, four-way change-over valve 13, magnetic valve IV 14, finned heat exchanger 15, blower fan 16, knockout 17, exhaust by-pass valve 18, check valve I 19, check valve II 20, reservoir 21, device for drying and filtering 22, liquid-sighting glass 23, magnetic valve I 24, magnetic valve II 25, heating power expansion valve II 26, heating power expansion valve III 27, magnetic valve III 28, heating power expansion valve I 29, economizer 30, check valve III 31, check valve IV 32, check valve V 33, stop valve II 34, case tube heat exchanger 35, water route motor-driven valve 36, oil cooler.

The specific embodiment

As shown in Figure 1, a kind of low form air-cooled screw hot and cold water unit, it comprises gas-liquid separator 1, oil strainer 2, stop valve I 3, pressure of inspiration(Pi) transmitter 4, helical-lobe compressor oil-out 5, helical-lobe compressor 6, helical-lobe compressor oil-in 7, helical-lobe compressor jet 8, pressure-equalizing pipe 9, pressure maintenance valve 10, exhaust gas temperature sensor 11, four-way change-over valve 12, magnetic valve IV 13, finned heat exchanger 14, blower fan 15, knockout 16, exhaust by-pass valve 17, check valve I 18, check valve II 19, reservoir 20, device for drying and filtering 21, liquid-sighting glass 22, magnetic valve I 23, magnetic valve II 24, heating power expansion valve II 25, heating power expansion valve III 26, magnetic valve III 27, heating power expansion valve I 28, economizer 29, check valve III 30, check valve IV 31, check valve V 32, stop valve II 33, case tube heat exchanger 34, water route motor-driven valve 35, oil cooler 36, its design feature is that one end of four-way change-over valve 12 connects fin heat exchanger assembly, finned heat exchanger assembly You Si road finned heat exchanger 14 and the pipeline being in series by knockout 16 compose in parallel, finned heat exchanger assembly side arranges 4 blower fans 15, and finned heat exchanger assembly connects exhaust by-pass valve in parallel 17, check valve I 18 and check valve II 19, after check valve I 18 is in parallel with check valve IV 31, be connected reservoir 20, reservoir 20 connects device for drying and filtering 21, device for drying and filtering 21 connects liquid-sighting glass 22, liquid-sighting glass 22 connects magnetic valve I 23 and economizer 29 major loop imports in parallel, magnetic valve I 23 connects heating power expansion valve I 28, heating power expansion valve I 28 connects the spray circuits import of economizer 29, the spray circuits outlet of economizer 29 connects check valve V 32, check valve V 32 connecting screw rod compressor jets 8, economizer 29 major loop outlets connect magnetic valve II 24 and magnetic valve III 27 in parallel, magnetic valve II 24 connects heating power expansion valve II 25, magnetic valve III 27 connects heating power expansion valve III 26, after heating power expansion valve II 25 is in parallel with heating power expansion valve III 26, be connected check valve II 19 in parallel and check valve III 30, after check valve III 30 is in parallel with check valve IV 31, be connected case tube heat exchanger 34, case tube heat exchanger 34 connects one end of four-way change-over valve 12, four-way change-over valve 12 intermediate ends connect gas-liquid separator 1, gas-liquid separator 1 connecting screw rod compressor 6 air entries, between gas-liquid separator 1 outlet and helical-lobe compressor 6 air entries, pressure of inspiration(Pi) transmitter 4 is installed, spiral shell helical-lobe compressor 6 exhaust outlet Bonding pressures maintain valve 10, the equal Bonding pressure balance pipe 9 of suction end of pressure maintenance valve 10 and helical-lobe compressor 6, on pressure maintenance valve 10 export pipelines, exhaust gas temperature sensor 11 is set, exhaust gas temperature sensor 11 connects four-way change-over valve 12 one end and magnetic valve IV 13, magnetic valve IV 13 connects exhaust by-pass valve 17, form refrigerant loop, helical-lobe compressor oil-out 5 connects stop valve II 33, stop valve II 33 connects the oil circuit import of oil cooler 36, and the oil circuit outlet of oil cooler 36 connects oil strainer 2, and oil strainer 2 connects stop valve I 3, stop valve I connecting screw rod compressor oil-in 7, forms oil return line, air-conditioning water inlet pipe connects water route motor-driven valve 35 in parallel and case tube heat exchanger 34, and water route motor-driven valve 35 connects the water route import of oil cooler 36, and the water route outlet of oil cooler 36 is connected air-conditioner water outlet pipe with after case tube heat exchanger 34 parallel connections, forms water loop.

1) refrigeration mode: four-way change-over valve 12 is in refrigeration position, cold-producing medium is compressed into high temperature and high pressure gas in helical-lobe compressor 6, through four-way change-over valve 12, enter finned heat exchanger 14, cold-producing medium thermal release becomes middle temperature highly pressurised liquid to air, then by reservoir 20, device for drying and filtering 21 and liquid-sighting glass 22, after heating power expansion valve reducing pressure by regulating flow, heat in the interior absorption water of case tube heat exchanger 34, water temperature is reduced and reach refrigeration object, cold-producing medium evaporation becomes low-temp low-pressure gas, through gas-liquid separator 1, four-way change-over valve 12 enters helical-lobe compressor 6 and completes a kind of refrigeration cycle.

2) heating mode: four-way change-over valve 12 is in heating position, cold-producing medium is compressed into high temperature and high pressure gas in helical-lobe compressor 6, through four-way change-over valve 12, enter case tube heat exchanger 34, case tube heat exchanger 34 interior by thermal release to water, water temperature is raise and reach refrigeration object, then by reservoir 20, device for drying and filtering 21 and liquid-sighting glass 22, after heating power expansion valve reducing pressure by regulating flow, heat in the interior absorption outside air of finned heat exchanger 14, cold-producing medium is evaporated to low-temp low-pressure gas, through gas-liquid separator 1, four-way change-over valve 12 enters helical-lobe compressor 6 and completes one and heat circulation.

A) between exhaust outlet of compressor and evaporator, be provided with exhaust by-pass valve 17, pressure of inspiration(Pi) transmitters sense unit pressure of inspiration(Pi) value, when suction pressure of compressor is lower than setting value during 0.2MPa, opens solenoid valve IV 13, compressor air-discharging end gas arrives low pressure one side through exhaust by-pass valve 17 auto bypass, to maintain certain pressure of inspiration(Pi); When suction pressure of compressor is higher than setting value during 0.3MPa, shut electromagnetic valve IV 13, cuts off exhaust by-pass valve pipeline, and while guaranteeing that unit is in environment temperature-20 ℃, helical-lobe compressor 6 evaporating pressures are all not less than the limiting value of permission all the time.

B) when compressor exhaust temperature is too high, in order to reduce compressor exhaust temperature, unit design by the oil cooling system of water quench.Exhaust gas temperature sensor 11 detects compressor exhaust temperature, when delivery temperature 110 ℃ time, is opened water route motor-driven valve 35 higher than setting value, by a cooling water bypass part for case tube heat exchanger 34 import departments to oil cooler 36, by reducing the temperature of lubricating oil, reach the object that reduces delivery temperature; When delivery temperature, lower than setting value, 100 ℃ time, close water route motor-driven valve 35, cut off the water loop of oil cooler 36.By water quench compressor lubricant oil, when reducing lubricating oil temperature, the temperature of cooling water is raise, increased the heating capacity of unit, improved the COP value of system.

C) unit starting under low temperature environment, because the condensation temperature of system is too low, after compressor start, foundation does not play enough height pressure reduction, causes compressor cannot add unloading, in order to solve this difficult problem, at exhaust outlet of compressor setting pressure, maintains valve 10.Before compressor start, unit high and low pressure balance, high-low pressure difference lower than pressure maintenance valve 10 built-in open valve pressure difference, pressure maintenance valve is closed; After compressor start, because of exhaust close, pressure at expulsion rises rapidly, to pressure at expulsion and pressure of inspiration(Pi) (being transmitted by pressure-equalizing pipe) difference reach pressure maintenance valve 10 built-in open valve pressure reduction time, pressure maintenance valve 10 is opened, make compressor can set up rapidly enough height pressure reduction at short notice, and then it is smooth and easy to ensure that compressor displacement regulating loads, ensures that compressor does not cause harmful effect because losing oil; When compressor shutdown, pressure maintenance valve 10 has the effect of check-valves, prevents that gases at high pressure from passing back into compressor, effectively avoids compressor to reverse for a long time; Meanwhile, when compressor shutdown, pressure maintenance valve 10 can cut off compressor and gas exhaust piping completely, has greatly facilitated the maintaining of unit.

Claims

1. a low form air-cooled screw hot and cold water unit, it comprises gas-liquid separator (1), oil strainer (2), stop valve I (3), pressure of inspiration(Pi) transmitter (4), helical-lobe compressor oil-out (5), helical-lobe compressor (6), helical-lobe compressor oil-in (7), helical-lobe compressor jet (8), pressure-equalizing pipe (9), pressure maintenance valve (10), exhaust gas temperature sensor (11), four-way change-over valve (12), magnetic valve IV (13), finned heat exchanger (14), blower fan (15), knockout (16), exhaust by-pass valve (17), check valve I (18), check valve II (19), reservoir (20), device for drying and filtering (21), liquid-sighting glass (22), magnetic valve I (23), magnetic valve II (24), heating power expansion valve II (25), heating power expansion valve III (26), magnetic valve III (27), heating power expansion valve I (28), economizer (29), check valve III (30), check valve IV (31), check valve V (32), stop valve II (33), case tube heat exchanger (34), water route motor-driven valve (35), oil cooler (36), the one end that it is characterized in that four-way change-over valve (12) connects fin heat exchanger assembly, finned heat exchanger assembly You Si road finned heat exchanger (14) and the pipeline being in series by knockout (16) compose in parallel, finned heat exchanger assembly side arranges 4 blower fans (15), and finned heat exchanger assembly connects exhaust by-pass valve in parallel (17), check valve I (18) and check valve II (19), after check valve I (18) is in parallel with check valve IV (31), be connected reservoir (20), reservoir (20) connects device for drying and filtering (21), device for drying and filtering (21) connects liquid-sighting glass (22), liquid-sighting glass (22) connects magnetic valve I (23) in parallel and economizer (29) major loop import, magnetic valve I (23) connects heating power expansion valve I (28), heating power expansion valve I (28) connects the spray circuits import of economizer (29), the spray circuits outlet of economizer (29) connects check valve V (32), check valve V (32) connecting screw rod compressor jet (8), the outlet of economizer (29) major loop connects magnetic valve II (24) and magnetic valve III (27) in parallel, magnetic valve II (24) connects heating power expansion valve II (25), magnetic valve III (27) connects heating power expansion valve III (26), after heating power expansion valve II (25) is in parallel with heating power expansion valve III (26), be connected check valve II (19) in parallel and check valve III (30), after check valve III (30) is in parallel with check valve IV (31), be connected case tube heat exchanger (34), case tube heat exchanger (34) connects one end of four-way change-over valve (12), four-way change-over valve (12) intermediate ends connects gas-liquid separator (1), gas-liquid separator (1) connecting screw rod compressor (6) air entry, between gas-liquid separator (1) outlet and helical-lobe compressor (6) air entry, pressure of inspiration(Pi) transmitter (4) is installed, helical-lobe compressor (6) exhaust outlet Bonding pressure maintains valve (10), the suction end Bonding pressure balance pipe (9) of pressure maintenance valve (10) and helical-lobe compressor (6), on pressure maintenance valve (10) export pipeline, exhaust gas temperature sensor (11) is set, exhaust gas temperature sensor (11) connects four-way change-over valve (12) one end and magnetic valve IV (13), magnetic valve IV (13) connects exhaust by-pass valve (17), form refrigerant loop, helical-lobe compressor oil-out (5) connects stop valve II (33), stop valve II (33) connects the oil circuit import of oil cooler (36), the oil circuit outlet of oil cooler (36) connects oil strainer (2), oil strainer (2) connects stop valve I (3), stop valve I (3) connecting screw rod compressor oil-in (7), forms oil return line, air-conditioning water inlet pipe connects water route motor-driven valve (35) in parallel and case tube heat exchanger (34), water route motor-driven valve (35) connects the water route import of oil cooler (36), the water route outlet of oil cooler (36) is connected air-conditioner water outlet pipe with after case tube heat exchanger (34) parallel connection, forms water loop.