CN101865589B - Environment-friendly and freon-free ultralow cold storage - Google Patents
Environment-friendly and freon-free ultralow cold storage Download PDFInfo
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- CN101865589B CN101865589B CN2010102256300A CN201010225630A CN101865589B CN 101865589 B CN101865589 B CN 101865589B CN 2010102256300 A CN2010102256300 A CN 2010102256300A CN 201010225630 A CN201010225630 A CN 201010225630A CN 101865589 B CN101865589 B CN 101865589B
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Abstract
The invention discloses environment-friendly and freon-free ultralow cold storage and aims to provide the ultralow cold storage which adopts a three-stage cascade refrigerating system, has high cooling speed and low refrigerating temperature, applies environment-friendly refrigerants and has little loss of refrigeration capacity. The cold storage comprises a body, a cooling water system and a three-stage cascade refrigerating system formed by a high-temperature-level refrigeration cycle system, a medium-temperature-level refrigeration cycle system and a low-temperature-level refrigeration cycle system, wherein the body is made of three-layer polyurethane core panels; an internal door and an external door are installed on the body; equilibrium windows are arranged inside wall panels of the body; and the refrigerants in the high-temperature-level refrigeration cycle system, the medium-temperature-level refrigeration cycle system and the low-temperature-level refrigeration cycle system are respectively R404a, R23 and R14. The cold storage of the invention is large in available space inside, short in cooling time and high in refrigerating coefficient of the system, provides convenient conditions for more experiments and greatly expands the applicability.
Description
Technical field
The invention belongs to the techniques for ultra-low temperature field, in particular, relate to a kind of environmental protection, freon-free ultralow cold storage.
Background technology
At present, at refrigeration technology field, be divided into high temperature, middle temperature, low temperature and four big types of freezers of ultralow temperature by the refrigeration design temperature.Ultralow quick freezing repository also is ultra low temperature cool house.Be mainly used in low temperature medical treatment, low-temperature storage, the cooling of cryotronics device, low-temperature gas liquefaction and purifying, infrared system, vacuum refrigeration and drying and low temperature environment experimental facilities etc. is provided.Main users has electronic industry, hygiene medical treatment industry, institution of higher learning and scientific research institution etc.At present, domestic do not have ultralow cold storage basically, and the main dependence on import of the ultra low temperature cool house of domestic demand costs an arm and a leg.
At present, mostly the refrigeration system of the ultralow cold storage of home or overseas is to adopt two-stage cascade refrigeration system, and cryogenic temperature can only reach-30 ℃ to-80 ℃, and refrigerating capacity is low, and cooling rate is slow.Simultaneously, use among R12, R22, R500, R13, the R503 etc. mostly, low-temperature refrigerant, increase the weight of the greenhouse effects of the earth, the chlorine element that wherein contains can produce destruction to atmospheric ozone layer.And three grades of cascade refrigeration systems all are in conceptual phase, also do not obtain the application on the industry.
Summary of the invention
The present invention is in order to overcome weak point of the prior art, to provide a kind of employing three grades of cascade refrigeration systems, and cooling rate is fast, and cryogenic temperature is low, using environment-friendly type cold-producing medium, the ultralow cold storage that loss of refrigeration capacity is little.
The present invention realizes through following technical proposals:
A kind of environmental protection, freon-free ultralow cold storage is characterized in that, three grades of cascade refrigeration systems that comprise storehouse body, cooling water system, are made up of high temperature level cooling cycle system, middle temperature level cooling cycle system and low temperature level cooling cycle system; Said storehouse body is made by three layers of central layer of polyurethane, and inner layer door and outer door, the built-in balance window of said storehouse body wallboard are installed on the body of said storehouse; Said high temperature level cooling cycle system comprises high temperature stage compressor, water-cooled condenser, reservoir, high temperature level liquid-sighting glass, high temperature level device for drying and filtering, high temperature level magnetic valve, high temperature level heating power expansion valve; Said high temperature level heating power expansion valve and high temperature level condenser/evaporator; The refrigerant outlet of said high temperature stage compressor is connected with water-cooled condenser, reservoir, high temperature level liquid-sighting glass, high temperature level device for drying and filtering, high temperature level magnetic valve, high temperature level heating power expansion valve successively; Said high temperature level heating power expansion valve is connected with the pipe side-entrance of high temperature level condenser/evaporator; The pipe side outlet of said high temperature level condenser/evaporator is connected with the refrigerant inlet of said high temperature stage compressor, and the cold-producing medium in the said high temperature level cooling cycle system is R404a; Warm stage compressor, middle temperature level oil eliminator, middle temperature stage compressor vent gas cooler, said high temperature level condenser/evaporator, middle temperature level liquid-sighting glass, middle temperature level device for drying and filtering, middle temperature level magnetic valve, middle temperature level regenerator, middle temperature level heating power expansion valve, middle temperature level condenser/evaporator, middle temperature level relief valve, middle temperature level expansion drum, middle temperature level capillary during temperature level cooling cycle system comprises in said; The refrigerant outlet of temperature level refrigeration compressor is connected with middle temperature level oil eliminator, middle temperature stage compressor vent gas cooler successively in said; Warm stage compressor vent gas cooler is connected with the shell-side inlet of said high temperature level condenser/evaporator in said; The shell-side outlet of said high temperature level condenser/evaporator is connected with the shell-side inlet of middle temperature level liquid-sighting glass, middle temperature level device for drying and filtering, middle temperature level magnetic valve, middle temperature level regenerator successively; In said the outlet of the shell-side of temperature level regenerator with said in the refrigerant inlet of warm stage compressor be connected; The pipe side-entrance of temperature level regenerator is connected with the pipe side outlet of said middle temperature level condenser/evaporator in said; The pipe side outlet of temperature level regenerator is connected with the pipe side-entrance of said middle temperature level condenser/evaporator through middle temperature level heating power expansion valve in said; In said an interface of temperature level expansion drum through middle temperature grade relief valve with said in the exhaust outlet of warm stage compressor be connected; In said another interface of temperature level expansion drum through middle temperature level capillary with said in the air inlet of warm stage compressor is connected, the cold-producing medium in the said middle warm grade cooling cycle system is R23; Said low temperature level cooling cycle system comprises low temperature stage compressor, low temperature level oil eliminator, low temperature level vent gas cooler, said middle temperature level condenser/evaporator, low temperature level liquid-sighting glass, low temperature level device for drying and filtering, low temperature level magnetic valve, low temperature level regenerator, low temperature level heating power expansion valve, low temperature level evaporimeter, low temperature level expansion drum, low temperature level capillary; The refrigerant outlet of said low temperature stage compressor is connected with low temperature level oil eliminator, low temperature stage compressor vent gas cooler successively; Said low temperature stage compressor vent gas cooler is connected with the shell-side inlet of said middle temperature level condenser/evaporator; The shell-side outlet of temperature level condenser/evaporator is connected with the shell-side inlet of low temperature level liquid-sighting glass, low temperature level device for drying and filtering, low temperature level magnetic valve, low temperature level regenerator successively in said; The shell-side outlet of said low temperature level regenerator is connected with the refrigerant inlet of said low temperature stage compressor; The pipe side outlet of said low temperature level regenerator is connected with the import of said low temperature level evaporimeter through said low temperature level heating power expansion valve; The outlet of said low temperature level evaporimeter is connected with the pipe side-entrance of said low temperature level regenerator; An interface of said low temperature level expansion drum is connected with the exhaust outlet of said low temperature stage compressor through low temperature level relief valve; Another interface of said low temperature level expansion drum is connected with the air inlet of said low temperature stage compressor through low temperature level capillary, and the cold-producing medium in the said low temperature level cooling cycle system is R14.Wherein, The bulb of high temperature level heating power expansion valve is placed on the horizontal pipeline between high temperature level condenser/evaporator and the high temperature stage compressor; On the horizontal pipeline during the bulb of middle temperature level heating power expansion valve is placed between temperature grade regenerator and the middle temperature level condenser/evaporator, the bulb of low temperature level heating power expansion valve is placed on the horizontal pipeline between low temperature level evaporimeter and the low temperature level regenerator.The coolant outlet of cooling tower is connected with water-cooled condenser, middle temperature stage compressor vent gas cooler, low temperature stage compressor vent gas cooler successively in the said cooling water system, and the coolant outlet of said low temperature stage compressor vent gas cooler is connected with the water inlet of said cooling tower.
Said low temperature level evaporimeter is installed in body top, storehouse.
Said inner layer door is an iron door, and said outer door is the polyurethane thermal insulation board door.
Power supply is connected with middle temperature level delay switch with the high temperature stage compressor respectively, and a said middle temperature level delay switch is connected with low temperature level delay switch with middle temperature stage compressor respectively, and said low temperature level delay switch is connected with said low temperature stage compressor.
The present invention has following technique effect:
1. environmental protection of the present invention, freon-free ultralow cold storage adopt three grades of cascade refrigeration circulatory systems; Be in series through three one-stage steam compressing refrigeration systems; Cryogenic temperature is low; Can reach-110 ℃, and greatly reduce storehouse temperature required time when dropping to-110 ℃ by room temperature, coefficient of refrigerating performance reaches 0.2 in the time of-110 ℃.
2. the employed three kinds of cold-producing mediums of three grades of cascade refrigeration circulatory systems of environmental protection of the present invention, freon-free ultralow cold storage are green alternative chlorofluoro carbon; ODP is 0; The GWP of R23 is also very little, has avoided the destruction of atmospheric ozone layer is reached the aggravation to greenhouse effects, helps the protection to environment.
3. three layers of battenboard of storehouse body employing polyurethane foam of environmental protection of the present invention, freon-free ultralow cold storage and combining of two storied gate prevent that the cold draining measure is good, high insulating effect, and free space is big in the storehouse.And the built-in balance window of wallboard has guaranteed the balance of storehouse external and internal pressure in the process that temperature reduces, and has guaranteed the intensity and the tightness of storehouse body.
Description of drawings
Fig. 1 is environmental protection of the present invention, freon-free ultralow cold storage refrigeration system sketch map.
The specific embodiment
Below in conjunction with accompanying drawing and specific embodiment to the detailed description of the invention.
Three grades of cascade refrigeration systems that environmental protection of the present invention, freon-free ultralow cold storage system comprise storehouse body, cooling water system, are made up of high temperature level cooling cycle system, middle temperature level cooling cycle system and low temperature level cooling cycle system.Said storehouse body is made by three layers of central layer of polyurethane, and inner layer door and outer door, the built-in balance window of said storehouse body wallboard are installed on the body of said storehouse.The balance window can be selected one or two based on the size in space in the storehouse.Wherein, said inner layer door is an iron door, and said outer door is the polyurethane thermal insulation board door.Inner layer door makes in the storehouse air to the both sides convection current, and the air between outer door and the inner layer door can only be equivalent to increase a layer of air thermal resistance with the form cold scattering of heat conduction, can prevent effectively that cold scatters and disappears, and greatly reduces the cold draining loss.
The sketch map of refrigeration system of the present invention is as shown in Figure 1; Said high temperature level cooling cycle system comprises high temperature stage compressor 1, water-cooled condenser 2, reservoir 3, high temperature level liquid-sighting glass 4, high temperature level device for drying and filtering 5, high temperature level magnetic valve 6, high temperature level heating power expansion valve 7, high temperature level condenser/evaporator 8; The refrigerant outlet of said high temperature stage compressor 1 is connected with water-cooled condenser 2, reservoir 3, high temperature level liquid-sighting glass 4, high temperature level device for drying and filtering 5, high temperature level magnetic valve 6, high temperature level heating power expansion valve 7 successively; Said high temperature level heating power expansion valve 7 is connected with the pipe side-entrance of high temperature level condenser/evaporator 8; The pipe side outlet of said high temperature level condenser/evaporator 8 is connected with the refrigerant inlet of high temperature stage compressor 1, and the cold-producing medium in the said high temperature level cooling cycle system is R404a.Warm stage compressor 14, middle temperature level oil eliminator 15, middle temperature stage compressor vent gas cooler 29, high temperature level condenser/evaporator 8, middle temperature level liquid-sighting glass 9, middle temperature level device for drying and filtering 10, middle temperature level magnetic valve 11, middle temperature level regenerator 12, middle temperature grade heating power expansion valve 28, middle temperature grade condenser/evaporator 13, middle temperature grade relief valve 16, middle temperature grade expansion drum 17, middle temperature grade capillary 32 during a temperature level cooling cycle system comprises in said; The refrigerant outlet of temperature level refrigeration compressor 14 is connected with middle temperature level oil eliminator 15, middle temperature stage compressor vent gas cooler 29 successively in said; Warm stage compressor vent gas cooler 29 is connected with the shell-side inlet of high temperature level condenser/evaporator 8 in said; The shell-side outlet of high temperature level condenser/evaporator 8 is connected with the shell-side inlet of middle temperature level liquid-sighting glass 9, middle temperature level device for drying and filtering 10, middle temperature level magnetic valve 11, middle temperature level regenerator 12 successively; The shell-side outlet of middle temperature level regenerator 12 is connected with the refrigerant inlet of middle temperature stage compressor 14; The pipe side-entrance of middle temperature level regenerator 12 is connected with the pipe side outlet of middle temperature level condenser/evaporator 13; The pipe side outlet of middle temperature level regenerator 12 is connected with the pipe side-entrance of middle temperature level condenser/evaporator 13 through middle temperature level heating power expansion valve 28; An interface of temperature level expansion drum 17 is connected with the exhaust outlet of middle temperature stage compressor 14 through middle temperature level relief valve 16 in said; Another interface of middle temperature level expansion drum 17 is connected with the air inlet of middle temperature stage compressor 14 through a middle temperature level capillary 32, and the cold-producing medium in the said middle temperature level cooling cycle system is R23.Said low temperature level cooling cycle system comprises low temperature stage compressor 24, low temperature level oil eliminator 25, low temperature level vent gas cooler 30, middle temperature level condenser/evaporator 13, low temperature level liquid-sighting glass 18, low temperature level device for drying and filtering 19, low temperature level magnetic valve 20, low temperature level regenerator 21, low temperature level heating power expansion valve 22, low temperature level evaporimeter 23, low temperature level expansion drum 26, low temperature level capillary 31; The refrigerant outlet of said low temperature stage compressor 24 is connected with low temperature level oil eliminator 25, low temperature stage compressor vent gas cooler 30 successively; Low temperature stage compressor vent gas cooler 30 is connected with the shell-side inlet of middle temperature level condenser/evaporator 13; The shell-side outlet of middle temperature level condenser/evaporator 13 is connected with the shell-side inlet of low temperature level liquid-sighting glass 18, low temperature level device for drying and filtering 19, low temperature level magnetic valve 20, low temperature level regenerator 21 successively; The shell-side outlet of low temperature level regenerator 21 is connected with the refrigerant inlet of low temperature stage compressor 24; The pipe side outlet of said low temperature level regenerator 21 is connected with the import of low temperature level evaporimeter 23 through low temperature level heating power expansion valve 22; The outlet of low temperature level evaporimeter 23 is connected with the pipe side-entrance of low temperature level regenerator 21; An interface of low temperature level expansion drum 26 is connected with the exhaust outlet of low temperature stage compressor 24 through low temperature level relief valve 27; Another interface of low temperature level expansion drum 26 is connected with the air inlet of low temperature stage compressor 24 through low temperature level capillary 31, and the cold-producing medium in the said low temperature level cooling cycle system is R14.Said low temperature level evaporimeter 23 is installed in body top, storehouse.The bulb of high temperature level heating power expansion valve is placed on the horizontal pipeline between high temperature level condenser/evaporator and the high temperature stage compressor; On the horizontal pipeline during the bulb of middle temperature level heating power expansion valve is placed between temperature grade regenerator and the middle temperature level condenser/evaporator, the bulb of low temperature level heating power expansion valve is placed on the horizontal pipeline between low temperature level evaporimeter and the low temperature level regenerator.The coolant outlet of cooling tower is connected with water-cooled condenser, middle temperature stage compressor vent gas cooler, low temperature stage compressor vent gas cooler successively in the said cooling water system; The coolant outlet of said low temperature stage compressor vent gas cooler is connected with the water inlet of said cooling tower, makes cooling water successively through getting back to cooling tower behind water-cooled condenser, middle temperature stage compressor vent gas cooler, the low temperature stage compressor vent gas cooler.
In high temperature stage compressor 1, the R404a refrigerant vapour becomes the refrigerant vapour of HTHP after compression, and row is to water-cooled condenser 2; Temperature reduces before this in water-cooled condenser 2; Get rid of sensible heat, after carry out isobaric isothermal again condensation process get rid of latent heat, these heats are all taken away by cooling water.Refrigerant vapour has become the refrigerant liquid of HTHP fully at condensator outlet, gets into reservoir 3 then, and this is because the variation of system loading can make refrigerant mass fluxes change, so with reservoir 3.Flow to high temperature level heating power expansion valve 7 through high temperature level liquid-sighting glass 4, high temperature level device for drying and filtering 5, high temperature level magnetic valve 6 successively then, high temperature level liquid-sighting glass 4 is used to observe the state of cold-producing medium.High temperature level device for drying and filtering 5 is used for removing the moisture of cold-producing medium, opens during magnetic valve 6 starts, and is closed during shutdown.High temperature level heating power expansion valve 7 is outer balanced type heating power expansion valves; Cold-producing medium gets into high temperature level condenser/evaporator 8 after 7 throttlings of high temperature level heating power expansion valve; Cold-producing medium evaporates heat absorption in high temperature level condenser/evaporator 8; Absorb the heat of high temperature level condenser/evaporator 8 condensation side, self becomes refrigerant vapour then, gets into high temperature stage compressor 1.
In middle temperature stage compressor 14, temperature level oil eliminator 15 during the refrigerant vapour that the R23 refrigerant vapour becomes HTHP after compression gets into, separate the lubricating oil that obtains pump into by oil pump in warm stage compressor, with the oil return of warm stage compressor in realizing.Separate warm stage compressor vent gas cooler 29 in the cold-producing medium process that obtains, get into the shell-side inlet of high temperature level condenser/evaporator 8.Because compressor exhaust temperature is very high; If directly get into high temperature level condenser/evaporator 8; Its inner maximum local temperature difference is greater than 100 ℃; Can produce very big internal stress and be out of shape, reduce about 50 ℃ so the effect of middle temperature stage compressor vent gas cooler 29 is sensible heats of warm stage compressor exhaust in making.Reduce the condensation load of middle temperature level on the other hand, thereby reduced the evaporation load of high temperature level, reduced the power consumption of high temperature stage compressor 1, improved the COP of system.Cold-producing medium in high temperature level condenser/evaporator 8 before this temperature reduce, get rid of sensible heat, after carry out isobaric isothermal again condensation process get rid of latent heat, these heats are all taken away by high temperature level condenser/evaporator 8 evaporation side.Refrigerant vapour is at the refrigerant liquid of shell-side outlet having become the fully HTHP of high temperature level condenser/evaporator 8; Then successively through in temperature level liquid-sighting glass 9, middle temperature level device for drying and filtering 10, middle temperature level magnetic valve 11 get in the pipe side-entrance of warm grade regenerator 12; Realized coldly, increased refrigerating capacity.Middle temperature level liquid-sighting glass 9 is used to observe the state of cold-producing medium.Temperature level device for drying and filtering 10 is used for removing the moisture of cold-producing medium, opens when middle temperature level magnetic valve 11 is started shooting, and is closed during shutdown.Temperature grade heating power expansion valve 28 during temperature level regenerator 12 flows in the cold-producing medium process; A middle temperature level heating power expansion valve 28 is outer balanced type heating power expansion valves; Temperature level condenser/evaporator 13 in getting into after the cold-producing medium throttling; Cold-producing medium evaporation heat absorption in middle temperature level condenser/evaporator 13; The heat of temperature level condenser/evaporator 13 condensation side in the absorption; Self become the shell-side inlet of temperature level regenerator 12 in the refrigerant vapour entering then; To improve the degree of superheat of refrigerant vapour; Warm stage compressor 14 during the condition of work of warm stage compressor in the improvement, cold-producing medium are got into by middle temperature level regenerator 12.In warm stage compressor 14 when just having started; Because pressure at expulsion is too high; Temperature grade expansion drum 17 during temperature level relief valve 16 flows in the part exhaust warp; If middle temperature stage compressor 14 pressures of inspiration(Pi) are low excessively, warm stage compressor 14 air entries during the cold-producing medium in the middle temperature level expansion drum 17 can flow to through middle temperature level capillary 32 again play the tonifying Qi effect.
In low temperature stage compressor 24, the refrigerant vapour that the R14 refrigerant vapour becomes HTHP after compression gets into low temperature level oil eliminator 25, separates the lubricating oil that obtains and pumps into the low temperature stage compressor by oil pump, to realize the oil return of low temperature stage compressor.The shell-side inlet that separates temperature level condenser/evaporator 13 in cold-producing medium process low temperature level vent gas cooler 30 entering that obtain; Because compressor exhaust temperature is very high; If temperature level condenser/evaporator 13 in directly getting into; Its inner maximum local temperature difference is greater than 100 ℃; Meeting produces very big internal stress and is out of shape, so the effect of low temperature level vent gas cooler 30 is to make the sensible heat of low temperature stage compressor exhaust reduce about 30 ℃.Reduce the condensation load of low temperature level on the other hand, thereby reduced the evaporation load of middle temperature level, reduced the power consumption of middle temperature stage compressor 14, improved the COP of system.Cold-producing medium in middle temperature level condenser/evaporator 13 before this temperature reduce, get rid of sensible heat, after carry out isobaric isothermal again condensation process get rid of latent heat, these heats are all taken away by high temperature level evaporation side.Refrigerant vapour is at the refrigerant liquid of shell-side outlet having become the fully HTHP of middle temperature level condenser/evaporator 13; The pipe side-entrance that gets into low temperature level regenerator 21 through low temperature level liquid-sighting glass 18, low temperature level device for drying and filtering 19, low temperature level magnetic valve 20 successively then; Realized coldly, increased refrigerating capacity.Low temperature level liquid-sighting glass 18 is used to observe the state of cold-producing medium.Low temperature level device for drying and filtering 19 is used for removing the moisture of cold-producing medium, opens during the magnetic valve start, and is closed during shutdown.Cold-producing medium flows to low temperature level heating power expansion valve 22 through low temperature level regenerator 21, and low temperature level heating power expansion valve 22 is outer balanced type heating power expansion valves, gets into low temperature level evaporimeter 23 after the throttling; Cold-producing medium evaporates heat absorption in low temperature level evaporimeter 23; Absorb the heat in the freezer, the temperature in the freezer is reduced, self becomes refrigerant vapour then; Get into the shell-side inlet of low temperature level regenerator 21 then; To improve the degree of superheat of refrigerant vapour, improve the condition of work of low temperature stage compressor, get into the low temperature stage compressor then.When low temperature stage compressor 24 has just started; Because pressure at expulsion is too high; Part exhaust flows to low temperature level expansion drum 26 through low temperature level relief valve 27; If low temperature stage compressor 24 pressures of inspiration(Pi) are low excessively, the cold-producing medium in the low temperature level expansion drum 26 can flow to low temperature stage compressor 24 air entries through middle temperature level capillary 31 again, plays the tonifying Qi effect.
Smooth startup for warm stage compressor in ensureing and low temperature stage compressor; Power supply is connected with middle temperature level delay switch with the high temperature stage compressor respectively; Temperature level delay switch is connected with low temperature level delay switch with middle temperature stage compressor respectively in said, and said low temperature level delay switch is connected with said low temperature stage compressor.
At first open the water pump of cooling water system; By the time the cooling tower backwater is opened high temperature stage compressor 1 again, after measuring 10 seconds; High temperature level condenser/evaporator 8 pipe side-entrance temperature are reduced to-20 ℃ and (have only been dropped to-20 ℃; Just can open second compressor), thus in this installs one temperature level delay switch, delay adjustments is 10 seconds.When central temperature level delay switch started, middle temperature stage compressor 14 started, and after about 10 seconds, middle temperature grade condenser/evaporator 13 pipe side-entrance temperature are reduced to-50 ℃, at this moment, a low temperature level delay switch are installed again, and delay adjustments is 10 seconds.When low temperature level delay switch started, low temperature stage compressor 24 started.Like this, under the synergy of delay switch and expansion vessel, guaranteed the smooth startup operation of middle temperature stage compressor, low temperature stage compressor.Otherwise, high voltage protective can take place, middle temperature stage compressor and cryogenic compressor start failure, particularly low temperature stage compressor.The inlet temperature of cooling water is not more than 20 ℃.
Free space is big in the storehouse of the present invention's environmental protection of the present invention, freon-free ultralow cold storage, and temperature fall time is short, and the coefficient of refrigerating performance of system is high, is more conditions of providing convenience of testing more, has expanded the application of ultralow cold storage greatly.
Claims (4)
1. an environmental protection, freon-free ultralow cold storage is characterized in that, three grades of cascade refrigeration systems that comprise storehouse body, cooling water system, are made up of high temperature level cooling cycle system, middle temperature level cooling cycle system and low temperature level cooling cycle system; Said storehouse body is made by three layers of central layer of polyurethane, and inner layer door and outer door, the built-in balance window of said storehouse body wallboard are installed on the body of said storehouse; Said high temperature level cooling cycle system comprises high temperature stage compressor, water-cooled condenser, reservoir, high temperature level liquid-sighting glass, high temperature level device for drying and filtering, high temperature level magnetic valve, high temperature level heating power expansion valve, high temperature level condenser/evaporator; The refrigerant outlet of said high temperature stage compressor is connected with water-cooled condenser, reservoir, high temperature level liquid-sighting glass, high temperature level device for drying and filtering, high temperature level magnetic valve, high temperature level heating power expansion valve successively; Said high temperature level heating power expansion valve is connected with the pipe side-entrance of high temperature level condenser/evaporator; The pipe side outlet of said high temperature level condenser/evaporator is connected with the refrigerant inlet of said high temperature stage compressor, and the cold-producing medium in the said high temperature level cooling cycle system is R404a; Warm stage compressor, middle temperature level oil eliminator, middle temperature stage compressor vent gas cooler, said high temperature level condenser/evaporator, middle temperature level liquid-sighting glass, middle temperature level device for drying and filtering, middle temperature level magnetic valve, middle temperature level regenerator, middle temperature level heating power expansion valve, middle temperature level condenser/evaporator, middle temperature level relief valve, middle temperature level expansion drum, middle temperature level capillary during temperature level cooling cycle system comprises in said; The refrigerant outlet of temperature level refrigeration compressor is connected with middle temperature level oil eliminator, middle temperature stage compressor vent gas cooler successively in said; Warm stage compressor vent gas cooler is connected with the shell-side inlet of said high temperature level condenser/evaporator in said; The shell-side outlet of said high temperature level condenser/evaporator is connected with the shell-side inlet of middle temperature level liquid-sighting glass, middle temperature level device for drying and filtering, middle temperature level magnetic valve, middle temperature level regenerator successively; In said the outlet of the shell-side of temperature level regenerator with said in the refrigerant inlet of warm stage compressor be connected; The pipe side-entrance of temperature level regenerator is connected with the pipe side outlet of said middle temperature level condenser/evaporator in said; The pipe side outlet of temperature level regenerator is connected with the pipe side-entrance of said middle temperature level condenser/evaporator through middle temperature level heating power expansion valve in said; In said an interface of temperature level expansion drum through middle temperature grade relief valve with said in the exhaust outlet of warm stage compressor be connected; In said another interface of temperature level expansion drum through middle temperature level capillary with said in the air inlet of warm stage compressor is connected, the cold-producing medium in the said middle warm grade cooling cycle system is R23; Said low temperature level cooling cycle system comprises low temperature stage compressor, low temperature level oil eliminator, low temperature level vent gas cooler, said middle temperature level condenser/evaporator, low temperature level liquid-sighting glass, low temperature level device for drying and filtering, low temperature level magnetic valve, low temperature level regenerator, low temperature level heating power expansion valve, low temperature level evaporimeter, low temperature level expansion drum, low temperature level capillary; The refrigerant outlet of said low temperature stage compressor is connected with low temperature level oil eliminator, low temperature stage compressor vent gas cooler successively; Said low temperature stage compressor vent gas cooler is connected with the shell-side inlet of said middle temperature level condenser/evaporator; The shell-side outlet of temperature level condenser/evaporator is connected with the shell-side inlet of low temperature level liquid-sighting glass, low temperature level device for drying and filtering, low temperature level magnetic valve, low temperature level regenerator successively in said; The shell-side outlet of said low temperature level regenerator is connected with the refrigerant inlet of said low temperature stage compressor; The pipe side outlet of said low temperature level regenerator is connected with the import of said low temperature level evaporimeter through said low temperature level heating power expansion valve; The outlet of said low temperature level evaporimeter is connected with the pipe side-entrance of said low temperature level regenerator; An interface of said low temperature level expansion drum is connected with the exhaust outlet of said low temperature stage compressor through low temperature level relief valve; Another interface of said low temperature level expansion drum is connected with the air inlet of said low temperature stage compressor through low temperature level capillary, and the cold-producing medium in the said low temperature level cooling cycle system is R14; The bulb of high temperature level heating power expansion valve is placed on the horizontal pipeline between high temperature level condenser/evaporator and the high temperature stage compressor; On the horizontal pipeline during the bulb of middle temperature level heating power expansion valve is placed between temperature grade regenerator and the middle temperature level condenser/evaporator, the bulb of low temperature level heating power expansion valve is placed on the horizontal pipeline between low temperature level evaporimeter and the low temperature level regenerator; The coolant outlet of cooling tower is connected with water-cooled condenser, middle temperature stage compressor vent gas cooler, low temperature stage compressor vent gas cooler successively in the said cooling water system, and the coolant outlet of said low temperature stage compressor vent gas cooler is connected with the water inlet of said cooling tower.
2. environmental protection according to claim 1, freon-free ultralow cold storage is characterized in that, said low temperature level evaporimeter is installed in body top, storehouse.
3. environmental protection according to claim 2, freon-free ultralow cold storage is characterized in that, said inner layer door is an iron door, and said outer door is the polyurethane thermal insulation board door.
4. environmental protection according to claim 1, freon-free ultralow cold storage; It is characterized in that; Power supply is connected with middle temperature level delay switch with the high temperature stage compressor respectively; Temperature level delay switch is connected with low temperature level delay switch with middle temperature stage compressor respectively in said, and said low temperature level delay switch is connected with said low temperature stage compressor.
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| CN1492987A (en) * | 2001-02-23 | 2004-04-28 | IGC�����˶���ϵͳ��˾ | Ultra-low temperature closed-loop recirculating gas chilling system |
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