CN204535167U - A kind of falling film type water-cooling screw rod cryogenic fluid unit - Google Patents

A kind of falling film type water-cooling screw rod cryogenic fluid unit Download PDF

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Publication number
CN204535167U
CN204535167U CN201520133595.8U CN201520133595U CN204535167U CN 204535167 U CN204535167 U CN 204535167U CN 201520133595 U CN201520133595 U CN 201520133595U CN 204535167 U CN204535167 U CN 204535167U
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oil
valve
communicated
outlet
built
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王雪峰
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NANJING LENGDE ENERGY SAVING TECHNOLOGY Co Ltd
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NANJING LENGDE ENERGY SAVING TECHNOLOGY Co Ltd
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Abstract

The utility model discloses a kind of falling film type water-cooling screw rod cryogenic fluid unit, helical-lobe compressor is communicated with the built-in oil separating condenser air inlet of band, built-in oil separating condenser delivery valve is with to be communicated with helical-lobe compressor suction line, be with built-in oil separating condenser liquid outlet to lead up to economizer second channel to be communicated with the energy-conservation gas supplementing opening of helical-lobe compressor, another road is communicated with twin-stage downward film evaporator inlet through oil return heat exchanger first passage, economizer second channel, electric expansion valve, and twin-stage downward film evaporator gas outlet is communicated with helical-lobe compressor air inlet; Twin-stage downward film evaporator delivery valve is communicated with the central inlet of oil return heat exchanger second channel and injector, and injector outlet is communicated with helical-lobe compressor air suction way.Downward film evaporator is creatively applied on water-cooling screw rod cryogenic fluid unit by the utility model, improves the heat exchange efficiency of evaporimeter, is with built-in oil separating condenser to save unit space, and oil circuit design makes helical-lobe compressor oil return safer, more reliable.

Description

A kind of falling film type water-cooling screw rod cryogenic fluid unit
Technical field
The present invention relates to refrigerating field, more specifically, relate to a kind of falling film type water-cooling screw rod cryogenic fluid unit.
Background technology
At present, at refrigerating field, cryogenic freezing occasion generally uses a kind of with salt solution (NaCl or CaCl 2) or ethylene glycol solution adopt the refrigeration unit of screw compressor as refrigerating medium, heat exchanger adopts such unit of dry type shell and tube evaporator and water-cooled shell and tube condenser to be commonly referred to as dry type water-cooling screw low-temperature salt solution (ethylene glycol) solution unit.Owing to using the refrigeration system of dry type shell and tube evaporator to rely on evaporimeter self return-air band oil, not trapped fuel in evaporimeter, without the need to arranging extra oil return system, so system and control simple.But dry evaporator heat exchange is for being boiling in ducts heat exchange, along with cold-producing medium constantly evaporates, then gas refrigerant must occupy a part of heat exchange area, the cold-producing medium distribution of dry evaporator end is simultaneously difficult to accomplish evenly, thus affect the heat exchange efficiency of heat exchanger entirety, heat transfer temperature difference between cold-producing medium and refrigerating medium is generally more than 5 DEG C, and the lifting of its heat transfer efficiency is restricted, and causes the operational efficiency of whole refrigeration unit to be difficult to promote.Generally adopt flooded evaporator in the handpiece Water Chilling Units of field of air conditioning, flooded evaporator cold-producing medium is boiling heat transfer in the outer liquid pool of pipe, can realize less heat transfer temperature difference, generally within 2 DEG C, thus refrigeration unit operational efficiency be promoted greatly, owing to there being a large amount of liquid refrigerants in flooded evaporator, having a certain amount of refrigeration oil is dissolved in cold-producing medium, and return-air is the refrigeration oil cannot taking away this part, so flooded evaporator generally uses gases at high pressure to realize oil return for the liquid in power injection evaporimeter by Venturi transmission ejector, but the refrigeration unit evaporating temperature of air conditioning condition is all more than 0 DEG C, the mobility of refrigeration oil is better, oil return effect in flooded evaporator is better, but flooded evaporator is applied in below-15 DEG C, during low temperature situation, oil return then in evaporimeter just there will be not smooth, cause a large amount of trapped fuel in evaporimeter, greatly can reduce the heat exchange efficiency of heat exchanger like this, and then affect operational efficiency and the safety of whole refrigeration unit, and adopt the refrigeration unit of flooded evaporator, refrigerant charge will far away greatly with dry type unit, also the economical of full-liquid type refrigeration unit and the feature of environmental protection is made greatly to decline, so almost do not adopt flooded evaporator on the water-cooling screw rod hypothermic saline/ethylene glycol solution unit of prior art field evaporating temperature below-15 DEG C.For water-cooling screw rod hypothermic saline/ethylene glycol solution unit, under an urgent demand pursuing continuous improving energy efficiency, no matter adopt dry type or flooded evaporator all exists certain technical problem and difficulty, the efficiency how promoting water-cooling screw rod hypothermic saline/ethylene glycol solution unit is when the technical barrier of forward swing in face of technical staff.
Summary of the invention
Goal of the invention: in view of the deficiencies in the prior art, the invention provides a kind of falling film type water-cooling screw rod cryogenic fluid unit, its comparatively dry type unit operation efficiency greatly improve, comparatively the oil return of full-liquid type unit is safer, refrigerant charge reduces greatly, is easy to maintaining.
Technical scheme: falling film type water-cooling screw rod cryogenic fluid unit of the present invention, comprises helical-lobe compressor, is with built-in oil separating condenser, twin-stage downward film evaporator, electric expansion valve, economizer and oil return heat exchanger, described oil return heat exchanger comprises going out the first passage of interruption-forming by the first import and first and being gone out the second channel of interruption-forming by the second import and second, and described economizer comprises going out the first passage of interruption-forming by the first import and first and being gone out the second channel of interruption-forming by the second import and second, the exhaust outlet of described helical-lobe compressor is communicated with through the air inlet of gas exhaust piping with the built-in oil separating condenser of described band, described band built-in oil separating condenser inside is provided with built-in oil eliminator, the delivery valve of built-in oil eliminator is communicated with the suction line of described helical-lobe compressor, the liquid outlet of the built-in oil separating condenser of described band is divided into two-way: a road is through the second import of described economizer, second outlet of described economizer is communicated with the energy-conservation gas supplementing opening of described helical-lobe compressor, first inlet communication of another road and described oil return heat exchanger, first outlet of described oil return heat exchanger and the first inlet communication of described economizer, first outlet of described economizer and the inlet communication of described electric expansion valve, the outlet of described electric expansion valve is communicated with the inlet of described twin-stage downward film evaporator, the gas outlet of described twin-stage downward film evaporator is communicated with through the air inlet of suction line with described helical-lobe compressor, the delivery valve of described twin-stage downward film evaporator and the second inlet communication of described oil return heat exchanger, second outlet of described oil return heat exchanger is communicated with the central inlet of injector, the outlet of injector is communicated with the air suction way of described helical-lobe compressor, and the end import of injector is communicated with the enclosure interior of the built-in oil separating condenser of described band,
The gas refrigerant of high pressure-temperature row is proceeded to the built-in oil separating condenser of described band by described helical-lobe compressor, through the built-in oil eliminator separating oil of the built-in oil separating condenser of described band, form liquid refrigerant after condenser heat-exchange pipes heat exchange to export from liquid outlet: a road flows into the first passage of described oil return heat exchanger, the first passage of described economizer, described twin-stage downward film evaporator is entered into again after described electric expansion valve reducing pressure by regulating flow, liquid refrigerant is output into gaseous refrigerant from gas outlet after heat exchange in described twin-stage downward film evaporator, get back in described helical-lobe compressor through described suction line, another road flows into the second channel of described economizer, the energy-conservation gas supplementing opening that gaseous refrigerant enters described helical-lobe compressor is output into after carrying out heat exchange with the liquid refrigerant of described economizer first passage, the second channel of mixture to described oil return heat exchanger of low temperature liquid refrigeration agent and refrigeration oil discharged by the delivery valve of described evaporimeter, the high-temp liquid cold-producing medium exporting described oil return heat exchanger first passage with the built-in oil separating condenser of described band to carries out exchange heat, and the mixture absorbing heat gets back to described helical-lobe compressor from the second outlet of described oil return heat exchanger, the oil of described built-in oil eliminator gets back to described helical-lobe compressor after being discharged by delivery valve.
Connecting pipeline between described band built-in oil separating condenser liquid outlet and the second import of described economizer is provided with magnetic valve and heating power expansion valve, second outlet of described economizer is communicated with the energy-conservation gas supplementing opening of described helical-lobe compressor by tonifying Qi pipeline, and economizer tonifying Qi pipeline is provided with check valve; Orifice on the outer balance pipe of heating power expansion valve and economizer tonifying Qi pipeline, the temperature-sensitive bag of heating power expansion valve to be bundled in outside economizer tonifying Qi pipeline and fully to contact with economizer tonifying Qi pipeline.
Stop valve one is also provided with between the oil-out of described helical-lobe compressor and oil-in, oil cooler, oil strainer and stop valve two, the oil-out of described helical-lobe compressor is by the inlet communication of compressor outlet line one with stop valve one, the outlet of stop valve one is by the oil circuit inlet communication of compressor outlet line two with oil cooler, the oil circuit outlet of oil cooler is by the inlet communication of compressor in-line one with oil strainer, the outlet of oil strainer is by the inlet communication of compressor in-line two with stop valve two, the outlet of stop valve two is communicated with by the oil-in of compressor in-line three with described helical-lobe compressor, cooling water enters from the import of oil cooler, flow out from exporting after carrying out heat exchange with refrigeration oil, the front and back Water chamber end cap of oil cooler is respectively equipped with cooler exhaust-valve one and cooler exhaust-valve two and cooler blowoff valve one and cooler blowoff valve two, and lower housing portion is provided with oil drain valve.
The built-in oil separating condenser of described band comprises condenser shell, is located at the air inlet of condenser shell upper end, is located at the liquid outlet of condenser shell lower end and is located in the built-in oil eliminator of arranging up and down and condenser heat-exchange pipes in condenser shell, and the bottom of built-in oil eliminator is provided with separator delivery valve one and separator delivery valve two; The liquid level gauge assembly that described twin-stage downward film evaporator comprises evaporator shell, be located at the first inlet of evaporator shell upper end and gas outlet, be located at the second inlet in the middle part of evaporator shell, the first distributor be located in evaporator shell, the second distributor and heat exchanger tube, be located at evaporimeter delivery valve one bottom evaporator shell and evaporimeter delivery valve two and be located at outside evaporator shell; First distributor is positioned at evaporator shell inner top and is communicated with the first inlet, and the second distributor is positioned at evaporator shell middle part and is communicated with the second inlet.
Described gas exhaust piping is provided with exhaust gas temperature sensor, back pressure transducer, monitoring needle-valve one and maintenance angle valve one; Described suction line is provided with suction temperature sensor, inspiratory pressure sensor, monitoring needle-valve five, maintenance angle valve two, first oil circuit oil return valve, the second oil circuit oil return valve; The separator delivery valve one of the built-in oil separating condenser of described band and separator delivery valve two converge into a path through condenser threeway, then are communicated with the second oil circuit oil return valve of described suction line through the second oil strainer, oil return solenoid valve, Triple view mirror; The evaporimeter delivery valve one of described twin-stage downward film evaporator and evaporimeter delivery valve two converge into a path through evaporimeter oil return threeway, be communicated with the first oil circuit oil return valve of described suction line through the second channel of the first oil strainer, described oil return heat exchanger, the second visor, injector again, being communicated with ejection gas valve of injector, ejection gas valve to be located on the built-in oil separating condenser of described band and to be communicated with condenser shell inside.
Described built-in oil eliminator comprises air inlet pipe, lower coverboard, filter screen one, filter screen two, goes out oil baffle one, goes out oil baffle two, baffle plate one of giving vent to anger, baffle plate two of giving vent to anger, give vent to anger baffle plate three and baffle plate four of giving vent to anger; The horizontal center line of lower coverboard and described condenser shell is 30 ° of angles, and air inlet pipe is perpendicular to lower coverboard, and the channel cross-sectional area between air inlet pipe and lower coverboard is long-pending 1 ~ 1.5 times of air inlet pipe inner passage section; Filter screen one, filter screen two are symmetrically arranged in the both sides of air inlet pipe respectively, baffle plate one of giving vent to anger, give vent to anger baffle plate two arranged crosswise outside filter screen one, and baffle plate three of giving vent to anger, baffle plate four intersection of giving vent to anger are located at outside described filter screen two; Described separator delivery valve one and separator delivery valve two are arranged on two ends bottom described built-in oil eliminator and are communicated with the oil-out that described condenser shell has, described separator delivery valve one is being given vent to anger between baffle plate two and filter screen one, described separator delivery valve two is being given vent to anger between baffle plate four and filter screen two, sets out oil baffle one, goes out oil baffle two above the fuel-displaced place of described separator delivery valve one, separator delivery valve two.
The liquid outlet of the built-in oil separating condenser of described band and the connecting line of described electric expansion valve one end are provided with stop valve successively, monitor needle-valve two, device for drying and filtering, monitoring needle-valve three and the first visor, the other end of described electric expansion valve is communicated with described twin-stage downward film evaporator by tee pipe fitting, and the connecting pipeline of described electric expansion valve and tee pipe fitting is provided with monitors needle-valve four; Described electric expansion valve two ends are also connected with adjustable stop valve.
Described twin-stage downward film evaporator two ends are respectively equipped with evaporimeter hydroecium front head assembly and evaporimeter hydroecium rear head assembly, evaporimeter hydroecium front head assembly is convex-shaped, middle part is arranged with the second water inlet pipe and the second outlet pipe, top is provided with the second front head exhaust-valve, bottom is provided with the second front head blowoff valve, second water inlet pipe is provided with the second inflow temperature sensor, and the second outlet pipe is provided with the second leaving water temperature sensors and the second water flow switch; Evaporimeter hydroecium rear head assembly is also in convex-shaped, and top is provided with the second rear head exhaust-valve, the second rear head blowoff valve; Described evaporator shell top is provided with the second safety valve, the second service valve, and middle and lower part is provided with the first evaporimeter visor, the second evaporimeter visor and the 3rd evaporimeter visor in addition.
Beneficial effect: compared with prior art, falling film type water-cooling screw rod cryogenic fluid unit provided by the invention, tool has the following advantages:
1, downward film evaporator is creatively applied on water-cooling screw rod hypothermic saline/ethylene glycol solution unit by the present invention, particularly have employed twin-stage downward film evaporator, greatly reduce refrigerant charge, improve the heat exchange efficiency of evaporimeter, thus reduce heat transfer temperature difference, improve evaporating temperature, the overall operation efficiency of low-temperature refrigerant unit is promoted greatly;
2, present invention employs oil return heat exchanger, improve evaporimeter returning-oil temperature and reduce oil return viscosity, make evaporimeter oil return more smooth and easy, make feed flow realize certain degree of supercooling simultaneously, thus promote unit operation efficiency; When realizing identical degree of supercooling, the heat exchanger area reducing economizer can be realized, thus reduce costs;
3, present invention employs the condenser with built-in oil eliminator, oil is separated excellent, and the refrigeration oil entered in evaporimeter is greatly reduced, thus improves the heat exchange efficiency of evaporimeter, the oil eliminator of employing embedding structure saves the space shared by external oil content, structure simple optimizing;
4, present invention employs safer two-way oil return system, a road is evaporimeter oil return system, and a road is the built-in oil eliminator oil return system of condenser, makes helical-lobe compressor oil return safer, more reliably;
5, the present invention arranges oil cooler on the oil circuit of helical-lobe compressor, ensures the lubrication and cooling of moving component in helical-lobe compressor;
6, the present invention is by arranging oil return heat exchanger and economizer, improves evaporimeter returning-oil temperature, reduces oil return viscosity, make evaporimeter oil return more smooth and easy, make condenser liquid refrigerant temperature out reduce simultaneously, realize certain degree of supercooling, thus promote unit operation efficiency; When realizing identical degree of supercooling, the heat exchanger area reducing economizer can be realized, thus reduce costs; When worst cold case runs, control section liquid refrigerant gets back to the energy-conservation gas supplementing opening of helical-lobe compressor by economizer, to increase the capacity of helical-lobe compressor, thus realizes the lifting of system energy efficiency;
7, the present invention controls to the liquid supply rate in twin-stage downward film evaporator by regulating the aperture of electric expansion valve, the control of electronic expansion valve opening derives from the signal of the liquid level gauge that to be connected with twin-stage downward film evaporator, also the data that the exhaust gas temperature sensor that the suction temperature sensor arranged by suction line, inspiratory pressure sensor and gas exhaust piping are arranged, back pressure transducer collect carry out degree of superheat computing, control the aperture of electric expansion valve indirectly by suction superheat or discharge superheat; Electric expansion valve two ends are provided with bypass adjustable stop valve, and under preventing the unstable periods such as unit starting, electronic expansion valve controls signal judges the misoperation brought by accident, reduce probability of failure, thus improve the safety and stability of the operation of unit.
8, the present invention can be used for the occasions such as freezing, refrigeration, industrial ice making, efficient energy-saving, safe and reliable, and alternative conventional dry water-cooling screw rod hypothermic saline/ethylene glycol solution unit, has application value widely.
Accompanying drawing explanation
Fig. 1 is that the unit of the embodiment of the present invention is formed and operation logic figure.
Detailed description of the invention
Below by accompanying drawing, technical solution of the present invention is described in detail, but protection scope of the present invention is not limited to described embodiment.
Embodiment 1: falling film type water-cooling screw rod cryogenic fluid unit as shown in Figure 1, comprising: helical-lobe compressor 1, be with built-in oil separating condenser 2, twin-stage downward film evaporator 3, electric expansion valve 4, economizer 21, oil return heat exchanger 43, heating power expansion valve 36, oil cooler 39, gas exhaust piping 20, liquid feeding pipeline 26, suction line 25, oil-return pipeline system and other parts.
Helical-lobe compressor 1 exhaust outlet 1a is communicated with by gas exhaust piping 20 with the built-in oil separating condenser 2 air inlet 2a of band; Gas exhaust piping 20 is provided with exhaust gas temperature sensor 19, back pressure transducer 18, monitoring needle-valve one 24a, maintenance angle valve one 22a.
Be communicated with by liquid feeding pipeline one 26a with the import of stop valve 5 with the liquid outlet 2b of built-in oil separating condenser 2, the outlet of stop valve 5 is communicated with by liquid feeding pipeline two 26b with the import of device for drying and filtering 6, the outlet of device for drying and filtering 6 is communicated with by liquid feeding pipeline three 26c with the first import 43a of oil return heat exchanger 43, the first import 43a and first of oil return heat exchanger 43 exports 43b and is communicated with, first outlet 43b of oil return heat exchanger 43 is communicated with by liquid feeding pipeline eight 26k with the first import 21a1 of economizer 21, the first import 21a1 and first of economizer 21 exports 21a2 and is communicated with, first outlet 21a2 of economizer 21 is communicated with by liquid feeding pipeline nine 26m with the import of electric expansion valve 4, the outlet of electric expansion valve 4 is communicated with by liquid feeding pipeline seven 26j with the first interface 27a of tee pipe fitting 27, second interface 27b of tee pipe fitting 27 is communicated with by liquid feeding pipeline five 26g with the import of adjustable opening stop valve 28,3rd interface 27c of tee pipe fitting 27 is communicated with by liquid feeding pipeline four 26f with the first inlet 3a1 of twin-stage downward film evaporator 3, the outlet of adjustable opening stop valve 28 is communicated with by liquid feeding pipeline six 26h with the second inlet 3a2 of downward film evaporator 3, liquid feeding pipeline nine 26m is provided with the first visor 7, for observing the instruction of water content in flow of refrigerant state and cold-producing medium, on front and back pipeline 26m and 26j of electric expansion valve 4, difference opening bypass conduit hole, is communicated with the import and export of adjustable stop valve 8 with bypass line two 26e respectively by bypass line one 26i, liquid feeding pipeline two 26b, liquid feeding pipeline three 26c, liquid feeding pipeline eight 26k, liquid feeding pipeline nine 26m, liquid feeding pipeline seven 26j are respectively equipped with monitoring needle-valve two 24b, monitoring needle-valve three 24c, monitoring needle-valve four 24d, monitoring needle-valve six 24f, monitoring needle-valve seven 24g, when overhauling for unit maintenance, pressure drop before and after each parts monitored by Bonding pressure table, also can be used for filling, putting cold-producing medium.Opening bypass conduit hole on liquid feeding pipeline three 26c, by the inlet communication of economizer liquid line one 21b and magnetic valve 37, the outlet of magnetic valve 37 is by the inlet communication of economizer liquid line two 21c and heating power expansion valve 36, the outlet of heating power expansion valve 36 is communicated with the second import 21a3 of economizer 21 by economizer liquid line three 21d, the second import 21a3 and second of economizer 21 exports 21a4 and is communicated with, second outlet 21a4 of economizer 21 passes through the inlet communication of economizer tonifying Qi pipeline one 21e and check valve 38, the outlet of check valve 38 is communicated with the energy-conservation gas supplementing opening 1e of helical-lobe compressor 1 by economizer tonifying Qi pipeline two 21f, the outer balance pipe 36a of heating power expansion valve 36 is communicated with the interface 36f on economizer tonifying Qi pipeline one 21e, and the temperature-sensitive bag 36c of heating power expansion valve 36 to be bundled in outside economizer tonifying Qi pipeline one 21e and fully to contact with economizer tonifying Qi pipeline one 21e.Economizer 21 is a plate type heat exchanger, when worst cold case runs, magnetic valve 37 is opened, partially liq cold-producing medium enters economizer 21 second channel after heating power expansion valve 36 reducing pressure by regulating flow, heat exchange is carried out with the liquid refrigerant in first passage, liquid refrigerant evaporates in second channel becomes gaseous refrigerant, and absorb the heat of the liquid refrigerant in first passage, liquid refrigerant temperature reduction in first passage realized cold, cold-producing medium in second channel flashes to after gaseous state successively by economizer tonifying Qi pipeline one 21e, check valve 38, economizer tonifying Qi pipeline two 21f enters the energy-conservation gas supplementing opening 1e of helical-lobe compressor, to increase the capacity of helical-lobe compressor 1, thus realize the lifting of system energy efficiency.
The gas outlet 3b of twin-stage downward film evaporator 3 is communicated with by suction line 25 with the air inlet 1b of helical-lobe compressor; Suction line 25 is provided with suction temperature sensor 17, inspiratory pressure sensor 16, monitoring needle-valve five 24e, maintenance angle valve two 22b, the first oil circuit oil return valve 23a, the second oil circuit oil return valve 23b.
Built-in oil separating condenser 2 is with to comprise condenser shell 2t, condenser first tube sheet 2r1, condenser second tube sheet 2r2, built-in by separator 2c, condenser heat-exchange pipes 2i, condenser hydroecium front head assembly 2f, condenser hydroecium rear head assembly 2d, air inlet 2a, liquid outlet 2b etc.; Condenser hydroecium front head assembly 2f is provided with the first water inlet pipe 2f1 and the first outlet pipe 2f2, end socket top is provided with the first front head exhaust-valve 2f5, bottom is provided with the first front head blowoff valve 2f7, first water inlet pipe 2f1 is provided with the first inflow temperature sensor 2f6, and the first outlet pipe 2f2 is provided with the first leaving water temperature sensors 2f3 and the first water flow switch 2f4; The end socket top of condenser hydroecium rear head assembly 2d is provided with exhaust-valve 2d1, blowoff valve 2d2; Condenser shell 2t top is provided with the first safety valve 2g, ejection gas valve 2h1 and the first service valve 2h2.
Built-in oil eliminator 2c comprises air inlet pipe 2c10, lower coverboard 2c11, filter screen one 2c1, filter screen two 2c5, goes out oil baffle one 2c9a, goes out oil baffle two 2c9b, and separator delivery valve one 2c4, separator delivery valve two 2c8, baffle plate one 2c2 that gives vent to anger, baffle plate two 2c3 that gives vent to anger, baffle plate three 2c6 that gives vent to anger, give vent to anger baffle plate four 2c7; The horizontal center line of lower coverboard 2c11 and condenser shell 2t is 30 ° of angles, the channel cross-sectional area that perpendicular to the distance between lower coverboard 2c11, air inlet pipe 2c10 and lower coverboard 2c11, air inlet pipe 2c10 depends on that air inlet pipe inner passage section is amassed, distance between air inlet pipe 2c10 and lower coverboard 2c11 produces is long-pending 1 ~ 1.5 times of air inlet pipe inner passage section; Filter screen one 2c1, filter screen two 2c5 are located at the both sides of air inlet pipe 2c10 respectively, and are arranged symmetrically with; Separator delivery valve one 2c4, separator delivery valve two 2c8 are located at built-in oil eliminator 2c bottommost and are communicated with the bottom of built-in oil eliminator 2c by the oil-out that condenser shell 2t has; For ensureing that the liquid level stabilizing of oil-out is not by the impact of upper air, sets out oil baffle one 2c9a in the top near oil-out position, goes out oil baffle two 2c9b; For preventing the gas refrigerant through filter screen one 2c1, filter screen two 2c5, oil is taken away, to give vent to anger baffle plate one 2c2, baffle plate two 2c3 that gives vent to anger, baffle plate three 2c6 that gives vent to anger, baffle plate four 2c7 that gives vent to anger respectively arranged crosswise, separator delivery valve one 2c4 is arranged on and gives vent to anger between baffle plate two 2c3 and filter screen one 2c1, and separator delivery valve two 2c8 arranges and gives vent to anger between baffle plate four 2c7 and filter screen two 2c5.
Twin-stage downward film evaporator 3 comprises evaporator shell 3t, evaporimeter first tube sheet 3r1, evaporimeter second tube sheet 3r2, the first distributor 3c, the second distributor 3d, heat exchanger tube 3p, evaporimeter hydroecium front head assembly 3f, evaporimeter hydroecium rear head assembly 3e, the first inlet 3a1, the second inlet 3a2, gas outlet 3b, evaporimeter delivery valve one 3g1, evaporimeter delivery valve two 3g2, liquid level gauge assembly 31 etc.; Evaporimeter hydroecium front head assembly 3f is provided with the second water inlet pipe 3f1 and the second outlet pipe 3f2, end socket top is provided with the second front head exhaust-valve 3f6, bottom is provided with the second front head blowoff valve 3f7, second water inlet pipe 3f1 is provided with the second inflow temperature sensor 3f5, and the second outlet pipe 3f2 is provided with the second leaving water temperature sensors 3f3 and the second water flow switch 3f4; The end socket top of evaporimeter hydroecium rear head assembly 3e is provided with the second rear head exhaust-valve 3e1, the second rear head blowoff valve 3e2; Evaporator shell 3t top is provided with the second safety valve 3i, the second service valve 3j, evaporator shell 3t middle and lower part is provided with the first evaporimeter visor 3h1 in addition, the second evaporimeter visor 3h2, the 3rd evaporimeter visor 3h3; First distributor 3c is positioned at evaporator shell 3t internal upper part, first distributor 3c is communicated with the first inlet 3a1 on evaporator shell 3t top, second distributor 3d is positioned at evaporator shell 3t middle and lower part, second distributor 3d is communicated with the second inlet 3a2 in the middle part of evaporator shell 3t, heat exchanger tube 3p divides upper and lower twoth district arrangement, lays respectively at immediately below the second distributor 3c, the second distributor 3d; Evaporimeter delivery valve one 3g1, evaporimeter delivery valve two 3g2 are positioned at bottom evaporator shell 3t, are 15 ° of angles with the vertical center line of evaporator shell 3t, and are communicated with evaporator shell 3t inside.Twin-stage downward film evaporator 3 is also provided with liquid level gauge assembly 31 outside evaporator shell 3t.
The present invention has two-way oil return system, and a road is evaporimeter oil return system, and a road is the built-in oil eliminator oil return system of condenser, evaporimeter oil return system comprises: evaporimeter delivery valve one 3g1, evaporimeter delivery valve two 3g2 is respectively by evaporimeter return line one 29a, evaporimeter return line two 29b is communicated with evaporimeter oil return threeway 29, evaporimeter oil return threeway 29 is connected with the first oil strainer 9 import by evaporimeter return line three 29c, first oil strainer 9 is exported and is communicated with the second import 43c of oil return heat exchanger 43 by evaporimeter return line four 29d, the second import 43c and second of oil return heat exchanger 43 exports 43d and is communicated with, second outlet 43d of oil return heat exchanger 43 passes through the inlet communication of evaporimeter return line five 29e and the second visor 10, the outlet of the second visor 10 is communicated with the central inlet 11c of injector 11 by evaporimeter return line six 29f, the end import 11b of injector 11 is communicated with ejection gas valve 2h1 by evaporimeter return line seven 29g, ejection gas valve 2h1 is communicated with condenser shell 2t inside, the outlet 11a of injector 11 is communicated with the first oil circuit oil return valve 23a by evaporimeter return line eight 29h, and the first oil circuit oil return valve 23a is communicated with air intake duct 25 inside.Injector 11 is a venturi arrangement, by the gases at high pressure in condenser by the liquid refrigerant of low-pressure state in evaporimeter and oily injection in suction line 25, then get back in helical-lobe compressor 1.
Oil return heat exchanger 43 is a plate type heat exchanger, what in heat exchanger, first passage flow through is the high-temp liquid cold-producing medium flowed out from the built-in oil separating condenser 2 of band, the low temperature liquid refrigeration agent that what in heat exchanger, second channel flow through is flows out from twin-stage downward film evaporator 3 and the mixture of refrigeration oil, the heat of the absorption of fluids first passage inner fluid in second channel, thus improve twin-stage downward film evaporator 3 returning-oil temperature, reduce oil return viscosity, make twin-stage downward film evaporator 3 oil return more smooth and easy, make the built-in oil separating condenser 2 of band liquid refrigerant temperature out reduce simultaneously, realize certain degree of supercooling, thus lifting unit operation efficiency, when realizing identical degree of supercooling, the heat exchanger area reducing economizer 21 can be realized, thus reduce costs.
Because twin-stage downward film evaporator 3 adopts two-stage to distribute, liquid film on heat exchange pipe of evaporator 3p is thinner, greatly improve heat exchange efficiency, liquid storage face in twin-stage downward film evaporator 3 compared with low, cold-producing medium liquid storage amount is few, make it compared with the oil return safety and reliability of flooded evaporator, not only give full play to heat exchanger area, make helical-lobe compressor 1 run safer simultaneously.The built-in oil eliminator oil return system of condenser: separator delivery valve one 2c4, separator delivery valve two 2c8 is respectively by condenser return line one 30a, condenser return line two 30b is communicated with condenser threeway 30, condenser threeway 30 is by condenser return line three 30c and the second oil strainer 12 inlet communication, second oil strainer 12 exports the inlet communication by condenser return line four 30e and oil return solenoid valve 13, the outlet of oil return solenoid valve 13 is by the inlet communication of condenser return line five 30f and Triple view mirror 14, the outlet of Triple view mirror 14 is communicated with the second oil circuit oil return valve 23b by condenser return line six 30g, second oil circuit oil return valve 23b is communicated with suction line 25 inside, oil level switch action can be touched when helical-lobe compressor 1 li lower, control signal can be opened by instruction oil return solenoid valve 13, oil now in built-in oil eliminator 2c can be transported in suction line 25 by return line under the effect of height pressure reduction, then gets back in helical-lobe compressor 1.The high pressure detecting mouth 1c of helical-lobe compressor 1 and oil pressure are detected between mouth 1d and are arranged oil pressure difference switch 15, and be communicated with by oil pipeline one 15a, oil pipeline two 15b, for monitoring the pressure reduction at the oil strainer two ends in helical-lobe compressor 1, when the first oil strainer 9, second oil strainer 12 gets clogged, the action of oil pressure difference switch is reported to the police, remind cleaning first oil strainer 9, second oil strainer 12, ensure the fuel feeding safety of helical-lobe compressor 1 with this.Because the pressure ratio of cryogenic refrigerating system compressor is larger, cause delivery temperature higher, helical-lobe compressor 1 oil groove is in high pressure-temperature side, so the temperature of refrigeration oil can be higher when high pressure ratio runs, after exceeding uniform temperature, greatly decline even can carbonization for viscosity, thus have a strong impact on the lubrication and cooling of moving component in compressor, so this unit is also provided with oil cooler 39 on helical-lobe compressor 1 oil circuit, oil cooler 39 is a water-cooling type shell and tube exchanger, refrigeration oil is at shell fluid flow, and cooling water is at tube side flow, helical-lobe compressor oil-out 1f passes through the inlet communication of compressor outlet line one 41a and stop valve 1, the outlet of stop valve 1 is communicated with the oil circuit import 39a of oil cooler 39 by compressor outlet line two 41b, oil circuit import 39a and oil circuit export 39b and are communicated with, oil circuit outlet 39b passes through the inlet communication of compressor in-line one 40a and oil strainer 40, the outlet of oil strainer 40 is by the inlet communication of compressor in-line two 40b and stop valve 2 42, the outlet of stop valve 2 42 is communicated with the oil-out 1g of helical-lobe compressor 1 by compressor in-line three 40c, cooling water enters from the water inlet 39c of the side Water chamber end cap of oil cooler 39, flow out from delivery port 39d after carrying out heat exchange with refrigeration oil, the front and back Water chamber end cap of water-cooled oil cooling machine 39 is respectively equipped with cooler exhaust-valve one 39e1 and cooler exhaust-valve two 39e2 and cooler blowoff valve one 39f1 and cooler blowoff valve two 39f2, and the lower housing portion of oil cooler 39 is provided with oil drain valve 39g.
As shown in Figure 1, the operation logic of unit of the present invention is as follows: the gas refrigerant through the high pressure-temperature of helical-lobe compressor 1 compression is drained in the built-in oil separating condenser 2 of band through gas exhaust piping 20, most refrigeration oil is separated by the built-in oil eliminator 2c first in the built-in oil separating condenser 2 of band, gas refrigerant containing a small amount of refrigeration oil enters into condenser heat-exchange pipes 2i layout area, and with the cooling medium heat exchange flow through in condenser heat-exchange pipes 2i, gaseous refrigerant heat release/be condensed into liquid refrigerant, after liquid refrigerant flows out from condenser liquid outlet 2b, through stop valve 5, after device for drying and filtering 6 filters by liquid feeding pipeline successively through the first passage of oil return heat exchanger 13, the first passage of economizer 21, realized the entrance of cold rear arrival electric expansion valve 4, the cold-producing medium based on liquid state with a small amount of gas of low-pressure state is become through the reducing pressure by regulating flow effect of electric expansion valve 4, enter in the first distributor 3c in twin-stage downward film evaporator 3 and the second distributor 3d respectively by two-way, at the first distributor 3c, under the uniform distribution of the second distributor 3d, liquid refrigerant is dripped and is poured on heat exchange pipe of evaporator 3p, and with the refrigerating media for heat exchange that flows through in heat exchange pipe of evaporator 3p, liquid refrigerant absorbs heat, flash to gaseous refrigerant, gaseous refrigerant is got back in helical-lobe compressor 1 by suction line 25 after the gas outlet 3b of twin-stage downward film evaporator 3 flows out, thus complete whole kind of refrigeration cycle.Electric expansion valve 4 controls the liquid supply rate to twin-stage downward film evaporator 3 li by the adjustment of aperture, the control of electric expansion valve 4 aperture derives from the signal of liquid level gauge assembly 31, also the data that the exhaust gas temperature sensor 19 that the suction temperature sensor 17 arranged by suction line 25, inspiratory pressure sensor 16 and gas exhaust piping 20 are arranged, back pressure transducer 18 collect carry out degree of superheat computing, control the aperture of electric expansion valve 4 indirectly by suction superheat or discharge superheat.When worst cold case runs, magnetic valve 37 is opened, partially liq cold-producing medium enters economizer 21 second channel after heating power expansion valve 36 reducing pressure by regulating flow, heat exchange is carried out with the liquid refrigerant in economizer 21 first passage, liquid refrigerant in economizer 21 second channel flashes to gaseous state, and absorb the heat of the liquid refrigerant in economizer 21 first passage, liquid refrigerant temperature reduction in economizer 21 first passage realized cold, the energy-conservation gas supplementing opening 1e of helical-lobe compressor 1 is entered through check valve 38 and pipeline 21f by pipeline 21e after liquid refrigerant in economizer 21 second channel flashes to gaseous state, to increase the capacity of helical-lobe compressor 1, thus realize the lifting of system energy efficiency.
As mentioned above, although represented with reference to specific preferred embodiment and described the present invention, it shall not be construed as the restriction to the present invention self.Under the spirit and scope of the present invention prerequisite not departing from claims definition, various change can be made in the form and details to it.

Claims (8)

1. a falling film type water-cooling screw rod cryogenic fluid unit, is characterized in that: comprise helical-lobe compressor, be with built-in oil separating condenser, twin-stage downward film evaporator, electric expansion valve, economizer and oil return heat exchanger, described oil return heat exchanger comprises going out the first passage of interruption-forming by the first import and first and being gone out the second channel of interruption-forming by the second import and second, and described economizer comprises going out the first passage of interruption-forming by the first import and first and being gone out the second channel of interruption-forming by the second import and second, the exhaust outlet of described helical-lobe compressor is communicated with through the air inlet of gas exhaust piping with the built-in oil separating condenser of described band, described band built-in oil separating condenser inside is provided with built-in oil eliminator, the delivery valve of built-in oil eliminator is communicated with the suction line of described helical-lobe compressor, the liquid outlet of the built-in oil separating condenser of described band is divided into two-way: a road is through the second import of described economizer, second outlet of described economizer is communicated with the energy-conservation gas supplementing opening of described helical-lobe compressor, first inlet communication of another road and described oil return heat exchanger, first outlet of described oil return heat exchanger and the first inlet communication of described economizer, first outlet of described economizer and the inlet communication of described electric expansion valve, the outlet of described electric expansion valve is communicated with the inlet of described twin-stage downward film evaporator, the gas outlet of described twin-stage downward film evaporator is communicated with through the air inlet of suction line with described helical-lobe compressor, the delivery valve of described twin-stage downward film evaporator and the second inlet communication of described oil return heat exchanger, second outlet of described oil return heat exchanger is communicated with the central inlet of injector, the outlet of injector is communicated with the air suction way of described helical-lobe compressor, and the import of injector is communicated with the enclosure interior of the built-in oil separating condenser of described band,
The gas refrigerant of high pressure-temperature row is proceeded to the built-in oil separating condenser of described band by described helical-lobe compressor, through the built-in oil eliminator separating oil of the built-in oil separating condenser of described band, form liquid refrigerant after condenser heat-exchange pipes heat exchange to export from liquid outlet: a road flows into the first passage of described oil return heat exchanger, the first passage of described economizer, described twin-stage downward film evaporator is entered into again after described electric expansion valve reducing pressure by regulating flow, liquid refrigerant is output into gaseous refrigerant from gas outlet after heat exchange in described twin-stage downward film evaporator, get back in described helical-lobe compressor through described suction line, another road flows into the second channel of described economizer, is output into energy-conservation gas supplementing opening that gaseous refrigerant enter described helical-lobe compressor after carrying out heat exchange with the liquid refrigerant of described economizer first passage, the second channel of mixture to described oil return heat exchanger of low temperature liquid refrigeration agent and refrigeration oil discharged by the delivery valve of described evaporimeter, the high-temp liquid cold-producing medium exporting described oil return heat exchanger first passage with the built-in oil separating condenser of described band to carries out exchange heat, and the mixture absorbing heat flows out from the second outlet of described oil return heat exchanger to be got back in described helical-lobe compressor through injector, the oil of described built-in oil eliminator is got back in described helical-lobe compressor after being discharged by delivery valve.
2. falling film type water-cooling screw rod cryogenic fluid unit according to claim 1, it is characterized in that: the connecting pipeline between described band built-in oil separating condenser liquid outlet and the second import of described economizer is provided with magnetic valve and heating power expansion valve, second outlet of described economizer is communicated with the energy-conservation gas supplementing opening of described helical-lobe compressor by economizer tonifying Qi pipeline, and economizer tonifying Qi pipeline is provided with check valve; Orifice on the outer balance pipe of heating power expansion valve and economizer tonifying Qi pipeline, the temperature-sensitive bag of heating power expansion valve to be bundled in outside economizer tonifying Qi pipeline and fully to contact with economizer tonifying Qi pipeline.
3. falling film type water-cooling screw rod cryogenic fluid unit according to claim 1, it is characterized in that: between the oil-out of described helical-lobe compressor and oil-in, be also provided with stop valve one, oil cooler, oil strainer and stop valve two, the oil-out of described helical-lobe compressor is by the inlet communication of compressor outlet line one with stop valve one, the outlet of stop valve one is by the oil circuit inlet communication of compressor outlet line two with oil cooler, the oil circuit outlet of oil cooler is by the inlet communication of compressor in-line one with oil strainer, the outlet of oil strainer is by the inlet communication of compressor in-line two with stop valve two, the outlet of stop valve two is communicated with by the oil-in of compressor in-line three with described helical-lobe compressor, cooling water enters from the import of oil cooler, flow out from exporting after carrying out heat exchange with refrigeration oil, the front and back Water chamber end cap of oil cooler is respectively equipped with cooler exhaust-valve one and cooler exhaust-valve two and cooler blowoff valve one and cooler blowoff valve two, and lower housing portion is provided with oil drain valve.
4. falling film type water-cooling screw rod cryogenic fluid unit according to claim 1, it is characterized in that: the built-in oil separating condenser of described band comprises condenser shell, is located at the air inlet of condenser shell upper end, is located at the liquid outlet of condenser shell lower end and is located in the built-in oil eliminator of arranging up and down and condenser heat-exchange pipes in condenser shell, and the bottom of built-in oil eliminator is provided with separator delivery valve one and separator delivery valve two; The liquid level gauge assembly that described twin-stage downward film evaporator comprises evaporator shell, be located at the first inlet of evaporator shell upper end and gas outlet, be located at the second inlet in the middle part of evaporator shell, the first distributor be located in evaporator shell, the second distributor and heat exchanger tube, be located at evaporimeter delivery valve one bottom evaporator shell and evaporimeter delivery valve two and be located at outside evaporator shell; First distributor is positioned at evaporator shell inner top and is communicated with the first inlet, and the second distributor is positioned at evaporator shell middle part and is communicated with the second inlet.
5. falling film type water-cooling screw rod cryogenic fluid unit according to claim 4, is characterized in that: described gas exhaust piping is provided with exhaust gas temperature sensor, back pressure transducer, monitoring needle-valve one and maintenance angle valve one; Described suction line is provided with suction temperature sensor, inspiratory pressure sensor, monitoring needle-valve five, maintenance angle valve two, first oil circuit oil return valve, the second oil circuit oil return valve; The separator delivery valve one of the built-in oil separating condenser of described band and separator delivery valve two converge into a path through condenser threeway, then are communicated with the second oil circuit oil return valve of described suction line through the second oil strainer, oil return solenoid valve, Triple view mirror; The evaporimeter delivery valve one of described twin-stage downward film evaporator and evaporimeter delivery valve two converge into a path through evaporimeter oil return threeway, be communicated with the first oil circuit oil return valve of described suction line through the second channel of the first oil strainer, described oil return heat exchanger, the second visor, injector again, being communicated with ejection gas valve of injector, ejection gas valve to be located on the built-in oil separating condenser of described band and to be communicated with condenser shell inside.
6. falling film type water-cooling screw rod cryogenic fluid unit according to claim 4, is characterized in that: described built-in oil eliminator comprises air inlet pipe, lower coverboard, filter screen one, filter screen two, goes out oil baffle one, goes out oil baffle two, baffle plate one of giving vent to anger, baffle plate two of giving vent to anger, give vent to anger baffle plate three and baffle plate four of giving vent to anger; The horizontal center line of lower coverboard and described condenser shell is 30 ° of angles, and air inlet pipe is perpendicular to lower coverboard, and the channel cross-sectional area between air inlet pipe and lower coverboard is long-pending 1 ~ 1.5 times of air inlet pipe inner passage section; Filter screen one, filter screen two are symmetrically arranged in the both sides of air inlet pipe respectively, baffle plate one of giving vent to anger, give vent to anger baffle plate two arranged crosswise outside filter screen one, and baffle plate three of giving vent to anger, baffle plate four intersection of giving vent to anger are located at outside described filter screen two; Described separator delivery valve one and separator delivery valve two are arranged on two ends bottom described built-in oil eliminator and are communicated with the oil-out that described condenser shell has, described separator delivery valve one is being given vent to anger between baffle plate two and filter screen one, described separator delivery valve two is being given vent to anger between baffle plate four and filter screen two, sets out oil baffle one, goes out oil baffle two above the fuel-displaced place of described separator delivery valve one, separator delivery valve two.
7. falling film type water-cooling screw rod cryogenic fluid unit according to claim 4, it is characterized in that: the liquid outlet of the built-in oil separating condenser of described band and the connecting line of described electric expansion valve one end are provided with stop valve successively, monitoring needle-valve two, device for drying and filtering, monitoring needle-valve three and the first visor, the other end of described electric expansion valve is communicated with described twin-stage downward film evaporator by tee pipe fitting, described electric expansion valve is communicated with the first interface of tee pipe fitting by monitoring needle-valve four, second interface of tee pipe fitting is communicated with the second inlet of described twin-stage downward film evaporator by adjustable opening stop valve, 3rd interface of tee pipe fitting is communicated with the first inlet of described twin-stage downward film evaporator, described electric expansion valve two ends are also connected with adjustable stop valve.
8. falling film type water-cooling screw rod cryogenic fluid unit according to claim 1, it is characterized in that: described twin-stage downward film evaporator two ends are respectively equipped with evaporimeter hydroecium front head assembly and evaporimeter hydroecium rear head assembly, evaporimeter hydroecium front head assembly is convex-shaped, middle part is arranged with the second water inlet pipe and the second outlet pipe, top is provided with the second front head exhaust-valve, bottom is provided with the second front head blowoff valve, second water inlet pipe is provided with the second inflow temperature sensor, and the second outlet pipe is provided with the second leaving water temperature sensors and the second water flow switch; Evaporimeter hydroecium rear head assembly is also in convex-shaped, and top is provided with the second rear head exhaust-valve, the second rear head blowoff valve; Described evaporator shell top is provided with the second safety valve, the second service valve, and middle and lower part is provided with the first evaporimeter visor, the second evaporimeter visor and the 3rd evaporimeter visor in addition.
CN201520133595.8U 2015-03-10 2015-03-10 A kind of falling film type water-cooling screw rod cryogenic fluid unit Withdrawn - After Issue CN204535167U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104697225A (en) * 2015-03-10 2015-06-10 南京冷德节能科技有限公司 Falling film type water-cooled screw low-temperature solution unit
CN110388772A (en) * 2019-07-01 2019-10-29 重庆美的通用制冷设备有限公司 Control method, device and the heat pump air conditioner of heat pump air conditioner electric expansion valve
EP3627073A1 (en) * 2018-09-18 2020-03-25 Daikin applied Europe S.p.A. Flooded evaporator

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104697225A (en) * 2015-03-10 2015-06-10 南京冷德节能科技有限公司 Falling film type water-cooled screw low-temperature solution unit
EP3627073A1 (en) * 2018-09-18 2020-03-25 Daikin applied Europe S.p.A. Flooded evaporator
CN110388772A (en) * 2019-07-01 2019-10-29 重庆美的通用制冷设备有限公司 Control method, device and the heat pump air conditioner of heat pump air conditioner electric expansion valve
CN110388772B (en) * 2019-07-01 2021-02-23 重庆美的通用制冷设备有限公司 Control method and device for electronic expansion valve of heat pump air conditioner and heat pump air conditioner

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