CN103925726B - A kind of buried tubular type high temperature heat pump unit - Google Patents
A kind of buried tubular type high temperature heat pump unit Download PDFInfo
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Abstract
The invention discloses a kind of have safety, reliable, economical, efficient, can keep in repair and the buried tubular type high temperature heat pump unit of the features such as convenient operation, comprise main circulation loop and auxiliary circulation loop.The water side-entrance of the main evaporator of main circulation loop connects thermal source, the steam (vapor) outlet of main evaporator is connected with the air entry of main compressor, the exhaust outlet of main compressor is connected with the air intake of main condenser, the water inlet of main condenser connects use side backwater, the liquid outlet of this main condenser is connected with the liquid inlet of subcooler, and the liquid outlet of subcooler is connected with the two-phase liquid entrance of main evaporator; The air entry of the auxiliary compressor in auxiliary circulation loop is connected with the heat outlet of crossing of subcooler, the exhaust outlet of auxiliary compressor is connected with the hot gas inlet of auxiliary condenser, the water side outlet of auxiliary condenser is connected with the entrance of heating network, the water side entrance of auxiliary condenser is connected with the water side outlet of main condenser, and the liquid outlet of auxiliary condenser is connected with the two-phase liquid entrance of subcooler.
Description
Technical field
The present invention relates to a kind of buried tubular type high temperature heat pump unit.
Background technology
Present stage, the haze in the north was day by day serious, and one of haze " arch-criminal " heating or domestic hot-water's substituting with fossil-fuel boiler especially coal-burning boiler, be in now the more and more urgent stage.Heat pump is that substitute fossil fuels boiler carries out one prepared by heating or hot water and effectively applies means.For the high temperature heat pump unit of an applicable central heating heat source reforming application, following several conditions must be met:
A. suitable thermal source is selected, and existing source heat pump heat is air-source, underground water, soil source, river, source of sewage nothing more than.Due to northern harsh climate, air-source is used to be worthless as central heating thermal source; Underground water is after certain phase has been developed in the north, owing to recharging difficulty, serious to Destruction of Groundwater Resources, is also in now the strict management and control stage; Source of sewage is a good thermal source, but the shortcomings such as existence instability and not replicability, therefore can not as the main method of central heating heat source reforming.As long as and soil source has that suitable pipe laying area just can be stable provides low-grade heat; As long as same river, the transformation project Lijiang River is near, river is also a good thermal source.
B. higher COP, although the efficiency of fossil-fuel boiler especially coal burning boiler is lower, but because the cost of coal is lower, when using the application of heat pump to replace coal burning boiler, good efficiency must be had, could electric cost be reduced, close or lower than the cost of coal-burning boiler, just can there is good economic worth.With one kilogram of coal cost 0.7 yuan calculating, the calorific value of one kilogram of coal is 5000kcal, the available heat of 5000*0.6=3000kcal can be obtained by boiler combustion, and use heat pump to obtain electricity and 0.7/0.6=1.17kw that identical heat 3000/860=3.5kw must not expend 0.7 yuan of equal value, now the COP of heat pump is 2.99.
C. suitable reliability, because central heating can not stop for a long time, stops to bring the bursting by freezing of user's radiator dangerous for a long time.Therefore high to using the equipment requirement reliability of heat pump to replace boiler, failure rate is low.
D. suitable security, because central heating is mainly civil buildings service, and the feature of civil buildings to be the density of population large, safe precaution measure is poor.Therefore heat-pump apparatus should have high security.
E. suitable economy, the cost being applicable to central heating heat pump main frame can not be too high, otherwise will affect the investment payback time.
No matter be soil source or rivers source, have a common feature to be exactly that the temperature of low level heat energy is very low, great majority are all near 0 DEG C, and the water temperature of central heating radiator is very high, mostly at about 70 DEG C.What present stage met above-mentioned discussion completely has as a kind of central heating application the heat pump using the high temperature feature of side and the low temperature feature of heat source side, also neither one is completely propagable and have the replacement scheme of economic worth, although existing heat pump techniques or less demanding to heat source temperature, but require that use side temperature can not be too high, although higher use side temperature requirement can be met, but it is very high to the temperature requirement of heat source side, even if having can meet and also rest in minority western developed country compared with the heat pump techniques of low heat temperature and higher heat source temperature simultaneously, equipment price is expensive, economy is not high.
1. the technical characterstic of existing conventional water earth source heat pump: be confined to air conditioning applications, Technical comparing is ripe, and equipment cost is not high, keeps in repair easy; But its heat pump is not suitable for the high water temperature feature of central heating, i.e. enable over range application, also exists that heating capacity decay is serious, COP is low, the problems such as compressor life-span reduction.
2. the technical characterstic of existing heat pump of high-temp water source: the mix refrigerant using patent allotment, has higher critical temperatures, the features such as lower operating pressure, be adapted at Conventional press uses.Although use side water temperature can meet the water temperature requirement of central heating, very high to the temperature requirement of thermal source, for the working condition requirement of GBT25861-2010 water source high-temperature heat pump, under the condition using the 70 DEG C of water outlets in side, heat source temperature is 28 DEG C ~ 48 DEG C changes.Obvious this heat source temperature is not suitable for taking underground pipe as the heat pump of working condition.
3. existing two-stage compression heat pump techniques feature: use Two-stage Compression technology, lower heat source temperature can be met, the technical requirement of the buried tubular type earth source heat pump of very high use side water temperature; But existing double stage heat pump applied compression machine is expensive, and heating capacity is less, and unit cost is higher.
4. existing air injection enthalpy-increasing heat pump techniques feature: the economizer system being similar to helical-lobe compressor, when comparatively low heat temperature, strengthening heat pump heating capacity by improving system degree of supercooling, promoting heat pump efficiency.But use because some point of compressor cooling agent flux gives subcooler, make the refrigerant flow of evaporimeter reduce, therefore heat pump heating capacity hoisting power is limited.Be limited to specification capacity and the range of operation of heat pump compressor simultaneously, although use side can have higher water temperature, but do not reach the water temperature requirement of central heating.
5. existing cascade type heat pump technical characterstic: be applicable to low-temperature air source heat pump hot water technique, extremely low evaporating temperature and high condensation temperature, make system pressure ratio high, and delivery temperature is also very high; Therefore multiple stacked heat pump techniques is utilized to can solve this problem; But the application of declared working condition point at underground pipe water outlet zero degree, i.e. evaporimeter return water temperature 0 DEG C of the high temperature heat pump application under underground pipe working condition, evaporating temperature is now at-8 DEG C, and the efficiency of single stage compress is greater than the efficiency of repeatedly system again; Therefore superposition type system is not suitable for for the high temperature earth source heat pump under underground pipe working condition.
6. existing carbon dioxide high temperature heat pump technical characterstic: the hot water up to 90 DEG C can be produced in CO2 Trans-critical cycle heat pump application, and allow thermal source water temperature lower than 0 DEG C, therefore can compatibly pipe laying operating mode high temperature heat pump application, but the application of carbon dioxide heat-pump now concentrates on domestic hot-water's application of a heated type, namely use the large temperature difference application of side; For 20 DEG C, the 15 DEG C temperature difference of heating application, even the heating capacity of 10 DEG C of temperature difference carbon dioxide heat-pumps will greatly reduce and efficiency also declines to some extent, and the cost of carbon dioxide heat-pump unit is also very high simultaneously.
7. the technical characterstic of existing ammonia high temperature heat pump: use ammonia as cycle fluid, single stage compress, can produce 80 DEG C of hot water; Because ammonia is the classification of poisonous flammable B2 cold-producing medium, the use on civil buildings can bring potential safety hazard, and expensive, is therefore not suitable for the central heating application of civil buildings.
Summary of the invention
The object of the invention is to overcome the defect of prior art and a kind of buried tubular type high temperature heat pump unit is provided, namely according to heat source temperature scope-5 DEG C ~ 25 DEG C that GBT19409-2003 source pump can normally work, the heat pump that the most high energy using side can meet central heating or domestic hot-water's instructions for use reaches 75 DEG C of hot water carrys out substitute fossil fuels hot-water boiler, and this source pump should have security, reliability, economy, high efficiency that substitute fossil fuels boiler should possess, can keep in repair the also feature such as convenient operation.
The object of the present invention is achieved like this: a kind of buried tubular type high temperature heat pump unit, comprises main circulation loop and auxiliary circulation loop, wherein,
Described main circulation loop comprises main evaporator, main compressor, main condenser and subcooler, wherein, the water side-entrance of described main evaporator connects thermal source, the refrigerant steam (vapor) outlet of this main evaporator is connected with the air entry of described main compressor, the exhaust outlet of this main compressor is connected with the air intake of described main condenser, the water inlet of this main condenser connects use side backwater by pipeline, the subcooled liquid outlet of this main condenser is connected with the liquid inlet of described subcooler, and the liquid outlet of this subcooler is connected with the two-phase liquid entrance of described main evaporator by a main expansion valve;
Described auxiliary circulation loop comprises an auxiliary compressor, an auxiliary condenser and an auxiliary expansion valve, wherein, the air entry of auxiliary compressor is connected with the heat outlet of crossing of described subcooler, the exhaust outlet of this auxiliary compressor is connected with the hot gas inlet of auxiliary condenser, the water side outlet of this auxiliary condenser is connected with the entrance of heating network, the water side entrance of this auxiliary condenser is connected with the water side outlet of described main condenser, and the liquid outlet of this auxiliary condenser is connected with the two-phase liquid entrance of described subcooler by described auxiliary expansion valve;
The overheated refrigerant steam of low-pressure low-temperature is become after drawing thermal source in the soil of described main evaporator pipe laying system outdoor, the overheated refrigerant steam of high pressure-temperature is become after described main compressor compression, through described main condenser one-level condensation and heat described use side backwater, condensed high-temperature refrigeration liquid stream cools further through described subcooler, the heat absorption of described main evaporator is entered after described main expansion valve throttling, again become the overheated refrigerant steam of low-pressure low-temperature, form the single stage compress circulation of a standard;
From the high-temperature refrigeration liquid liberated heat that described main condenser flows out, after described subcooler heat exchange, become low-pressure superheated steam enter described auxiliary compressor, after the compression of described auxiliary compressor, become high temperature and high pressure steam enter described auxiliary condenser and carry out B-grade condensation, to by the heated further heat temperature raising of use side backwater of described main condenser, condensed refrigerant liquid enters the heat that described subcooler continues the high-temperature refrigeration liquid absorbing described main circulation loop after described auxiliary expansion valve throttling, become superheated low pressure vapor again to be compressed by described auxiliary compressor, also the single stage compress circulation of a standard is formed.
Above-mentioned buried tubular type high temperature heat pump unit, wherein, liquid outlet and a main filter and first magnetic valve of also connecting between described main expansion valve of described subcooler.
Above-mentioned buried tubular type high temperature heat pump unit, wherein, an after-filter of also connecting between described auxiliary condenser with described auxiliary expansion valve.
Above-mentioned buried tubular type high temperature heat pump unit, wherein, described main circulation loop also comprises rear second magnetic valve in parallel with described first magnetic valve and main expansion valve of first series connection and the second expansion valve.
Above-mentioned buried tubular type high temperature heat pump unit, wherein, described main compressor is half envelope helical-lobe compressor, and the oily coolant interface of this main compressor connects an external oil cooler; Described auxiliary compressor is half envelope piston compressor.
Above-mentioned buried tubular type high temperature heat pump unit, wherein, described oil cooler, described main evaporator, main condenser, subcooler and auxiliary condenser all adopt brazing plate type heat exchanger.
Above-mentioned buried tubular type high temperature heat pump unit, wherein, described unit is integrated into a module and is arranged in the framework of totally-enclosed sheet metal panel of a rectangle.
Above-mentioned buried tubular type high temperature heat pump unit, wherein, described framework comprise the channel-section steel underframe of a band fork truck base, four corner uprights, just, rear board, two side panels and dismountable top panel, the top fitting machine assembly electronic box of described front plate, two described side panels are made up of upper and lower side panel respectively.
Above-mentioned buried tubular type high temperature heat pump unit, wherein, the described unit being positioned at described framework is arranged to three layers, described main compressor is arranged in the top left side, described main condenser is arranged in top the right, described auxiliary compressor is arranged in the left side in middle level, and described main evaporator and described subcooler one the first from left are arranged in the left side of bottom rightly, and described auxiliary condenser is arranged in the right of bottom.
The technical scheme of buried tubular type high temperature heat pump unit of the present invention and existing heat pump compare and have following characteristics:
1) compare with water resource heat pump routinely, under the condition meeting compressor reliability service, improve heat medium water temperature, and heating capacity is without obvious decay, COP significantly promotes;
2) compare with GBT25861-2010 heat pump of high-temp water source, although compare reduce 5 ~ 10 DEG C than the heat medium water temperature 80 DEG C that can reach of GBT25861-2010 high-temp water source, the heat source temperature allowed reduces about 30 ~ 40 DEG C.And use conventional R134a cold-producing medium, compressor operating is safer, cheaper;
3) compare with two-stage compression heat pump techniques, although slightly higher than the heat source temperature of two-stage compression heat pump permission, heat medium water temperature is slightly low, and cost only has 1/3 ~ 1/2 of two-stage compression heat pump, and has larger heating capacity scope;
4) compare with existing air injection enthalpy-increasing heat pump techniques, auxiliary compressor elevator system degree of supercooling is utilized not reduce the cold medium flux of main evaporator, improve heating capacity more greatly, utilize assisted heat pump to circulate simultaneously and heat heat medium water again, reduce the range of operation requirement to main compressor;
5) compare with existing cascade type heat pump technology, under underground pipe working condition, although major cycle is single stage compress, but still than superposition type, there is higher efficiency, the Advantages found of superposition type under lower thermal source condition, as air-source;
6) compare with existing carbon dioxide high temperature heat pump technology, although have higher GWP value than CO2, be more suitable for the requirement of central heating 10 ~ 20 DEG C of temperature difference, and the parts of routine bring the reduction of unit cost and the convenience of maintenance;
7) compare with existing ammonia high temperature heat pump, R134a working medium belongs to A1 class cold-producing medium, does not nontoxicly fire, and is more suitable for applying at civil buildings.And parts are all domestic supply, more cheaply and more easily obtain.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of buried tubular type high temperature heat pump unit of the present invention;
Fig. 2 is the annexation schematic diagram of the concrete parts of buried tubular type high temperature heat pump unit of the present invention;
Fig. 3 is the outline drawing of the model machine of buried tubular type high temperature heat pump unit of the present invention;
Fig. 4 is the front view of the model machine of buried tubular type high temperature heat pump unit of the present invention;
Fig. 5 is the dorsal view of the model machine of buried tubular type high temperature heat pump unit of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described.
Refer to Fig. 1 and Fig. 2, one of the present invention buried tubular type high temperature heat pump unit, comprises main circulation loop and auxiliary circulation loop, wherein,
Main circulation loop comprises main evaporator 12, main compressor 1, main condenser 2 and subcooler 5, wherein, main evaporator 12 is refrigerant-water-to-water heat exchanger that water side is connected with thermal source pipe network, and the water side-entrance of this main evaporator 12 is connected with the outlet of heating network by a heat source side return pipe 20; The water side outlet of this main evaporator 12 is connected with heat source tube web portal by a heat source side outlet pipe 21; The refrigerant steam (vapor) outlet of this main evaporator 12 is connected with the air entry of main compressor 1 by a major loop air intake duct 16; This main compressor 1 is half envelope helical-lobe compressor, and the half oily coolant interface sealing helical-lobe compressor 1 connects an external oil cooler 13, and this oil cooler 13 is oil-water-to-water heat exchanger that water side is connected with heating network, and it utilizes the backwater cooling refrigeration oil of heating network; The exhaust outlet of this main compressor 1 is connected with the air intake of main condenser 2 by a major loop blast pipe 14, and this main condenser 2 is refrigerant-water-to-water heat exchanger that water side is connected with heating network; The water inlet of this main condenser 2 is connected with the outlet of heating network by user side return pipe 22; The subcooled liquid outlet of this main condenser 2 is connected with the liquid inlet of subcooler 5 by a major loop liquid pipe 15, and this subcooler 5 is refrigerant-refrigerant heat exchanger; The liquid outlet of this subcooler 5 is passed through a major loop liquid pipe 15 ' and is connected with the two-phase liquid entrance of main evaporator 12 with main expansion valve 10 by main filter 6, first magnetic valve 8 successively;
The second magnetic valve 9 and the second expansion valve 11 that main circulation loop is in parallel with the first magnetic valve 8 and main expansion valve 10 after also comprising first series connection.
Auxiliary circulation loop comprises an auxiliary compressor 3, one auxiliary condenser 4 and an auxiliary expansion valve 7, wherein, the air entry of auxiliary compressor 3 is connected with the heat outlet of crossing of subcooler 5 by a subsidiary loop air intake duct 19, the exhaust outlet of this auxiliary compressor 3 is connected with the hot gas inlet of auxiliary condenser 4 by a subsidiary loop blast pipe 17, the water side outlet of this auxiliary condenser 4 is connected with the entrance of heating network by a user side outlet pipe 24, the water side entrance of this auxiliary condenser 4 is connected with the water side outlet of main condenser 2 by a user side hot water tube connector 23, the liquid outlet of this auxiliary condenser 4 is also connected with the two-phase liquid entrance of subcooler 5 with auxiliary expansion valve 7 by an after-filter 6 ' successively by a subsidiary loop liquid pipe 18,
The overheated refrigerant steam of low-pressure low-temperature is become after draw heat in the soil of main evaporator 12 pipe laying system outdoor, the overheated refrigerant steam of high pressure-temperature is become after main compression 1 machine compression, through main condenser 2 one-level condensation and heat and use side backwater, condensed high-temperature refrigeration liquid stream cools further through subcooler 5, through main expansion valve 10 throttling laggard enter main evaporator 12 absorb heat, again become the overheated refrigerant steam of low-pressure low-temperature, form the single stage compress circulation of a standard; The high pressure-temperature height enthalpy liquid of main condenser 2 can continue cooling at subcooler 5, the two-phase liquid that the high pressure low temperature refrigerant liquid becoming low enthalpy becomes low-pressure low-temperature identical with enthalpy before valve after main expansion valve 10 throttling enters main evaporator 12, increase the refrigerating capacity of main evaporator 12, namely the caloric receptivity of source over the ground, increases the heating capacity of main circulation loop simultaneously.
From the high-temperature refrigeration liquid liberated heat that main condenser 2 flows out, after subcooler 5 heat exchange, become low-pressure superheated steam enter auxiliary compressor 3, after auxiliary compressor 3 compresses, become high temperature and high pressure steam enter auxiliary condenser 4 and carry out B-grade condensation, to by the heated further heat temperature raising of use side backwater of main condenser 2, condensed refrigerant liquid enters the heat that subcooler 5 continues the high-temperature refrigeration liquid absorbing main circulation loop after auxiliary expansion valve joint 7 stream, become superheated low pressure vapor again to be compressed by auxiliary compressor 3, also the single stage compress circulation of a standard is formed.
Buried tubular type high temperature heat pump unit of the present invention, main circulation loop and auxiliary circulation loop are named as major-minor combined cycle by the heat pump single stage compress circulation that subcooler 5 links together, the structure of this major-minor combined cycle makes the cold increasing of the mistake of major cycle on the one hand, add heating capacity and the system energy efficiency of major cycle, on the other hand auxiliary circulation is obtained thermal source that one has higher temperature, can make the water temperature of heat medium water promote further.The low degree of supercooling use that second expansion valve 11 is (when refrigeration or auxiliary circulation loop do not reach unlocking condition) during main circulation loop independent loops.
Refer to Fig. 3 to Fig. 5 again, buried tubular type high temperature heat pump unit of the present invention is integrated into a module and is arranged in the framework of totally-enclosed sheet metal panel of a rectangle, ensure that the standardization production of heat pump main frame and the unified management of parts, improve production efficiency.This framework comprise a band fork truck base High-strength channel steel underframe 300, four corner uprights 400, just, rear board 200, two side panels and dismountable top panel 800, top fitting machine assembly electronic box 100, two side panels of front plate 200 are made up of upper and lower side panel 500,600 respectively.This framework is for convenience detach, liner acoustical cotton, and running noises is extremely low, adapts to the low noise requirement of civil buildings machine room.The refrigerant stop valve that should operate in all coolant systems, filter are all arranged in the front of easily detachable front plate 2, and M R is convenient.Underframe 300 is provided with forklift hole, and suspension ring are arranged at the top of framework, makes equipment moving and installs facility.
The unit being positioned at framework is arranged to three layers, main compressor 1 is arranged in the top left side, adopt external oil cooling but device 13, main condenser 2 is arranged in top the right, auxiliary compressor 3 is arranged in the left side in middle level, main evaporator 12 and subcooler 5 one the first from left are arranged in the left side of bottom rightly, and auxiliary condenser 4 is arranged in the right of bottom.
Heat medium water backwater divides two-way after entering unit by user side return pipe 22, and a road directly enters main condenser 2, and another road enters main condenser 2 again after oil cooler 13.The blast pipe 14 of main compressor 1 is connected with main condenser 2, the liquid pipe 15 of main condenser 2 and be arranged in the connection suitable for reading of subcooler 5 of bottom, the lower end outlet adapter 15 ' of subcooler 5 is connected with main expansion valve 10, second expansion valve 11 with first, second magnetic valve 8,9 by ball valve, main filter 6, ball valve, liquid-sighting glass successively, the rear gas-liquid two-phase pipe of main expansion valve 10 is connected with the main evaporator 12 being arranged in bottom, and the outlet of this main evaporator 12 is upwards connected by the air entry of major loop air intake duct 16 with the main compressor 1 being arranged in upper strata.
The subsidiary loop blast pipe 17 that auxiliary compressor 3 connects is connected with the auxiliary condenser 4 being arranged in lower floor, the outlet of auxiliary condenser 4 is by being connected with auxiliary expansion valve 7 after subsidiary loop liquid pipe 18 access valve, after-filter 6 ', liquid-sighting glass, the rear gas-liquid two-phase pipe of auxiliary expansion valve 7 is connected with subcooler 5, and the outlet of this subcooler 5 is upwards connected with the air entry of the auxiliary compressor 3 being arranged in intermediate layer by subsidiary loop air intake duct 19.
Buried tubular type high temperature heat pump unit of the present invention, the PLC of framework embedded heating machine room host computer procedure, a certain of the Modular high-temperature heat pump main frame group of large application in parallel or several can be specified flexibly to be machine tool, the source pump start and stop of unified command multiple stage parallel connection application; And can by machine room auxiliary device as the maximum working pressure of use side water pump, heat source side water pump, small pump, use side and minimum operating pressure control to include in.The low level rear tube mode of source and use side makes multiple stage parallel connection simpler.
Buried tubular type high temperature heat pump unit of the present invention, adopt two-step heating heat pump cycle operational mode, the water temperature that the first order can be made to heat reduces, the condensation temperature of effective reduction master circulation, reduce the lower high pressure ratio brought of master circulating and evaporating temperature of underground pipe operating mode and cross high exhaust temperature problem, increasing the reliability of main compressor.Although auxiliary compressor heating simultaneously is the outer net heating backwater that the first order has heated, condensation temperature is higher, and because the evaporating temperature of auxiliary side is higher, therefore the delivery temperature of auxiliary compressor also can be controlled effectively, and reliability also can be protected.
Buried tubular type high temperature heat pump unit of the present invention, there are two different heat sources, the major-minor heat pump united circulation of a heat sink, the high condensation temperature of the high temperature heat pump of major cycle underground pipe operating mode and the feature of low evaporating temperature can be utilized, heating capacity and the COP of major cycle is greatly improved by the degree of supercooling increasing major cycle, and because auxiliary circulation has condensation temperature, more high evaporation temperature is higher, also can guarantee that auxiliary circulation has higher heating capacity and COP.The main and auxiliary condenser that helps has same heat sink in addition, ensure that heating capacity can effectively utilize.
Buried tubular type high temperature heat pump unit of the present invention, main circulation loop adopts the helical-lobe compressor of large capacity, although compressor operational envelope only can meet the requirement of first order heating water temperature, the feature that central heating system heating capacity is large can be met, and effectively can reduce machine cost.What the change that auxiliary side adopts less capacity, refrigerating capacity and master to cross cold sensible heat enthalpy difference adapted partly seals piston compressor, although price is slightly expensive, the range of operation comparing first order compressor is broader, can meet the requirement of the higher water temperature of second level heating completely.
Buried tubular type high temperature heat pump unit of the present invention, auxiliary compressor adopts has the varying capacity multi-machine heads multicylinder compressor adjusting device, adapt to master refrigerant flow different under different operating mode and the cold enthalpy difference of different mistakes, guarantee the main and auxiliary scope helping combined cycle can be operated in different chamber's external heat source temperature heat supply temperature different from heating network safely and efficiently.
Buried tubular type high temperature heat pump unit of the present invention, main compressor adopts external oil cooling but technology, has widened the range of operation of helical-lobe compressor larger, guarantees that outside ground heat exchanger still can reliability service under the operating mode of decay.
Buried tubular type high temperature heat pump unit of the present invention, main evaporator, main condenser, subcooler, auxiliary condenser and oil cooler all adopt brazing plate type heat exchanger, greatly reduce coolant injection amount and complete machine weight, and the herringbone structure of braze welding type sheet heat exchanger makes heat medium water change in passage at flaggy forms larger shearing force and be not easy fouling.
Above embodiment is used for illustrative purposes only, but not limitation of the present invention, person skilled in the relevant technique, without departing from the spirit and scope of the present invention, various conversion or modification can also be made, therefore all equivalent technical schemes also should belong to category of the present invention, should be limited by each claim.
Claims (10)
1. a buried tubular type high temperature heat pump unit, comprises main circulation loop and auxiliary circulation loop, it is characterized in that,
Described main circulation loop comprises main evaporator, main compressor, main condenser and subcooler, wherein, the water side-entrance of described main evaporator connects thermal source, the refrigerant steam (vapor) outlet of this main evaporator is connected with the air entry of described main compressor, the exhaust outlet of this main compressor is connected with the air intake of described main condenser, the water inlet of this main condenser connects use side backwater by pipeline, the subcooled liquid outlet of this main condenser is connected with the liquid inlet of described subcooler, and the liquid outlet of this subcooler is connected with the two-phase liquid entrance of described main evaporator by a main expansion valve;
Described auxiliary circulation loop comprises an auxiliary compressor, an auxiliary condenser and an auxiliary expansion valve, wherein, the air entry of auxiliary compressor is connected with the heat outlet of crossing of described subcooler, the exhaust outlet of this auxiliary compressor is connected with the hot gas inlet of auxiliary condenser, the water side outlet of this auxiliary condenser is connected with the entrance of heating network, the water side entrance of this auxiliary condenser is connected with the water side outlet of described main condenser, and the liquid outlet of this auxiliary condenser is connected with the two-phase liquid entrance of described subcooler by described auxiliary expansion valve;
The overheated refrigerant steam of low-pressure low-temperature is become after drawing thermal source in the soil of described main evaporator pipe laying system outdoor, the overheated refrigerant steam of high pressure-temperature is become after described main compressor compression, through described main condenser one-level condensation and heat described use side backwater, condensed high-temperature refrigeration liquid stream cools further through described subcooler, the heat absorption of described main evaporator is entered after described main expansion valve throttling, again become the overheated refrigerant steam of low-pressure low-temperature, form the single stage compress circulation of a standard;
From the high-temperature refrigeration liquid liberated heat that described main condenser flows out, after described subcooler heat exchange, become low-pressure superheated steam enter described auxiliary compressor, after the compression of described auxiliary compressor, become high temperature and high pressure steam enter described auxiliary condenser and carry out B-grade condensation, to by the heated further heat temperature raising of use side backwater of described main condenser, condensed refrigerant liquid enters the heat that described subcooler continues the high-temperature refrigeration liquid absorbing described main circulation loop after described auxiliary expansion valve throttling, become superheated low pressure vapor again to be compressed by described auxiliary compressor, also the single stage compress circulation of a standard is formed.
2. buried tubular type high temperature heat pump unit according to claim 1, is characterized in that, liquid outlet and a main filter and first magnetic valve of also connecting between described main expansion valve of described subcooler.
3. buried tubular type high temperature heat pump unit according to claim 1, is characterized in that, an after-filter of also connecting between described auxiliary condenser with described auxiliary expansion valve.
4. buried tubular type high temperature heat pump unit according to claim 2, is characterized in that, described main circulation loop also comprises rear second magnetic valve in parallel with described first magnetic valve and main expansion valve of first series connection and the second expansion valve.
5. buried tubular type high temperature heat pump unit according to claim 1, is characterized in that, described main compressor is half envelope helical-lobe compressor, and the oily coolant interface of this main compressor connects an external oil cooler; Described auxiliary compressor is half envelope piston compressor.
6. buried tubular type high temperature heat pump unit according to claim 5, is characterized in that, described oil cooler adopts brazing plate type heat exchanger.
7. buried tubular type high temperature heat pump unit according to claim 1, it is characterized in that, described main evaporator, main condenser, subcooler and auxiliary condenser also all adopt brazing plate type heat exchanger.
8. buried tubular type high temperature heat pump unit according to claim 1, it is characterized in that, described unit is integrated into a module and is arranged in the framework of totally-enclosed sheet metal panel of a rectangle.
9. buried tubular type high temperature heat pump unit according to claim 8, it is characterized in that, described framework comprise the channel-section steel underframe of a band fork truck base, four corner uprights, just, rear board, two side panels and dismountable top panel, the top fitting machine assembly electronic box of described front plate, two described side panels are made up of upper and lower side panel respectively.
10. buried tubular type high temperature heat pump unit according to claim 8, it is characterized in that, the described unit being positioned at described framework is arranged to three layers, described main compressor is arranged in the top left side, described main condenser is arranged in top the right, described auxiliary compressor is arranged in the left side in middle level, and described main evaporator and described subcooler one the first from left are arranged in the left side of bottom rightly, and described auxiliary condenser is arranged in the right of bottom.
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