CN209371555U - Ultra low temperature overlapping heat pump unit - Google Patents

Ultra low temperature overlapping heat pump unit Download PDF

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Publication number
CN209371555U
CN209371555U CN201920031760.7U CN201920031760U CN209371555U CN 209371555 U CN209371555 U CN 209371555U CN 201920031760 U CN201920031760 U CN 201920031760U CN 209371555 U CN209371555 U CN 209371555U
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temperature
gas
compressor
heat pump
systems
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李国伟
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Qiqihar hongweiteng refrigeration equipment manufacturing Co., Ltd
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李国伟
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Abstract

The utility model provides a kind of ultra low temperature overlapping heat pump unit, is related to air heating technical field, solves air source heat pump system existing in the prior art bad technical problem of heating effect under low temperature and condition of ultralow temperature.The system includes low-temperature heating system and high temperature heating system, wherein the low-temperature heating system and the high temperature heating system are commonly connected to evaporative condenser and form overlapping;The high temperature heating system includes high-temperature systems compressor and the Gas-supplying enthalpy-increasing system that is connected with the high-temperature systems compressor, the high-temperature systems compressor is Gas-supplying enthalpy-increasing compressor, to carry out Gas-supplying enthalpy-increasing to the high-temperature systems compressor by the Gas-supplying enthalpy-increasing system connected to it.The utility model can operate normally generation high-temperature-hot-water under low temperature and condition of ultralow temperature;Meanwhile compared with existing electric heater, there is energy-saving and environment-friendly effect.

Description

Ultra low temperature overlapping heat pump unit
Technical field
The utility model relates to air to heat technical field, more particularly, to a kind of ultra low temperature overlapping heat pump unit.
Background technique
Along with beating for energy crisis alarm bell and growing to even greater heights for energy conservation and environmental protection cry, under renewable energy has become The emphasis of one step energy strategy.Wherein, air source heat pump is increasingly had been favored by people with the advantage of energy-saving and environmental protection.Air Source heat pump system be in the way of the heating operation of similar heat pump type room air conditioner, it is in the condensation side of system that temperature is lower Water heating.Since its refrigerating efficiency is usually 2~3 times of electric heater, there is very big energy-saving potential.Air source heat pump system Using air as heat source, using refrigerant as refrigerant, mainly by compressor, condenser, expansion valve, four-way valve, evaporator and gas The components such as liquid/gas separator composition, compressor suck low-temp low-pressure gaseous refrigerant from evaporator, are compressed it by acting High temperature and high pressure gaseous refrigerant is condensed after entering back into condenser and water progress heat exchange in low temperature liquid refrigerant, and water absorbs The heat that releases and constantly increase temperature.After the expanded valve reducing pressure by regulating flow of the high pressure low temperature liquid being condensed, in evaporator In surrounding air heat absorbed by the effect of blower to flash to be inhaled into compressor after low-pressure gas and compress, so pass through It crosses iterative cycles and continues hot water preparing.
However, the heating capacity of traditional air source heat pump system declines rapidly with the decline of outdoor environment temperature, when When outdoor temperature is lower, the heating capacity of system is even resulted in as low as the winter heating demand for being unable to satisfy north cold area System can not operate normally.Moreover, the pressure ratio of compressor can be increasing with the reduction of outdoor environment temperature, cause whole The refrigeration effect of body unit is undesirable.
Utility model content
It is existing in the prior art to solve the purpose of this utility model is to provide a kind of ultra low temperature overlapping heat pump unit Air source heat pump system bad technical problem of heating effect under low temperature and condition of ultralow temperature.It is provided by the utility model many Many technical effects elaboration as detailed below that optimal technical scheme in technical solution can be generated.
To achieve the above object, the utility model provides following technical scheme:
A kind of ultra low temperature overlapping heat pump unit provided by the utility model, including low-temperature heating system and high temperature heating system System, wherein the low-temperature heating system and the high temperature heating system are commonly connected to evaporative condenser and form overlapping;It is described High temperature heating system includes high-temperature systems compressor and the Gas-supplying enthalpy-increasing system that is connected with the high-temperature systems compressor, institute State high-temperature systems compressor be Gas-supplying enthalpy-increasing compressor, with by the Gas-supplying enthalpy-increasing system connected to it to the high temperature system Compressor of uniting carries out Gas-supplying enthalpy-increasing.
According to a kind of preferred embodiment, the high temperature heating system further include high-temperature systems gas-liquid separator, evaporation it is cold Condenser, high-temperature systems water condenser, high-temperature systems fluid reservoir and high-temperature systems device for drying and filtering, wherein the evaporative condenser Temperature end outlet be connected with the import of the high-temperature systems gas-liquid separator;The outlet of the high-temperature systems gas-liquid separator It is connected to the first air inlet of the high-temperature systems compressor, the exhaust outlet of the high-temperature systems compressor is connected to the high temperature The import of system water condenser, the outlet of the high-temperature systems water condenser are connected to the import of the high-temperature systems fluid reservoir; The outlet of the high-temperature systems fluid reservoir is connected to the import of the high-temperature systems device for drying and filtering.
According to a kind of preferred embodiment, the high-temperature systems device for drying and filtering is connected with four-way valve, the high temperature system System device for drying and filtering is connected with the evaporative condenser and the Gas-supplying enthalpy-increasing system respectively by the four-way valve.
According to a kind of preferred embodiment, it is swollen that electronics is equipped on major loop of the four-way valve with the evaporative condenser Swollen valve.
According to a kind of preferred embodiment, the Gas-supplying enthalpy-increasing system include the first heating power expansion valve and economizer, from The pipeline of the four-way valve connection divides two-way to be separately connected first heating power expansion valve and the economizer;Wherein described first Heating power expansion valve and check valve are connected with that four-way valve by the first pipeline;First input end of the economizer passes through second Pipeline is connected with that four-way valve.
According to a kind of preferred embodiment, the second input end of the economizer be connected to first heating power expansion valve and Between the check valve, the first exit end of the economizer is connected to major loop, and is back to the steaming through electric expansion valve It feels cold the temperature end import of condenser.
According to a kind of preferred embodiment, the second outlet end of the economizer is connected to auxiliary circuit, and through described auxiliary time Road is back to the Gas-supplying enthalpy-increasing air inlet of the high-temperature systems compressor.
According to a kind of preferred embodiment, the low-temperature heating system includes cryogenic system evaporator, cryogenic system gas-liquid Separator, cryogenic system compressor, evaporative condenser, cryogenic system fluid reservoir, cryogenic system device for drying and filtering and the second heat Power expansion valve.
According to a kind of preferred embodiment, the outlet and the import phase of the cryogenic system gas-liquid separator of the evaporator Connection;The outlet of the cryogenic system gas-liquid separator is connected to the air inlet of the cryogenic system compressor;The low temperature system The exhaust outlet of system compressor is connected to the low-temperature end import of the evaporative condenser, and the low-temperature end of the evaporative condenser, which exports, to be connected It is connected to the import of the cryogenic system fluid reservoir, it is dried that the outlet of the cryogenic system fluid reservoir is connected to the cryogenic system Filter and second heating power expansion valve;The outlet end of second heating power expansion valve is connected to the import of the evaporator;Institute Stating low-temperature heating system further includes heat exchange blower fan.
According to a kind of preferred embodiment, the ultra low temperature overlapping heat pump unit further includes hot water switching system, and the water is handed over The system of changing includes insulated water tank, the insulated water tank respectively with the high temperature water outlet end of high-temperature systems water condenser and water at low temperature into Mouth end is connected.
Based on the above-mentioned technical proposal, the ultra low temperature overlapping heat pump unit of the utility model embodiment at least has following technology Effect:
Low-temperature heating system and high temperature heating system are commonly connected to by the ultra low temperature overlapping heat pump unit of the utility model Evaporative condenser forms the structure of low-temperature heating system and high temperature heating system superposition type, and evaporative condenser is both low-temperature heating System condenser is the evaporator of high temperature heating system again, and refrigerant is inhaled in cryogenic system evaporator in low-temperature heating system Heat is received, and equality of temperature is become with the gas of pressure, gaseous state by the gas-liquid mixture of low-temp low-pressure by cryogenic system gas-liquid separator Refrigerant enters the steaming that can be used as cryogenic system condenser after being compressed into the gas of high temperature and pressure in cryogenic system compressor It feels cold and releases heat in condenser;At this point, refrigerant in high temperature heating system is by heat from can be used as high-temperature systems evaporator Evaporative condenser in absorb and bring high-temperature systems water by high-temperature systems gas-liquid separator and high-temperature systems compressor respectively Condenser transfers heat to water to carry out heat exchange, to obtain the high-temperature-hot-water of required temperature.It, can using superposition type structure It, can be in efficient operation under low temperature to be applied under low temperature conditions;The ultra low temperature overlapping heat pump machine of the utility model simultaneously Group is connected to Gas-supplying enthalpy-increasing system in the compressor of high temperature heating system, can be lower than 0 degree of ultralow temperature item below in temperature When part, increase the refrigerant flow of compressor automatically by Gas-supplying enthalpy-increasing system, makes it can be under low temperature, condition of ultralow temperature Heating is operated normally, high-temperature-hot-water is made.In addition, the ultra low temperature overlapping heat pump unit energy-saving and environmental protection of the utility model, while can Generation hot water can be operated normally at different ambient temperatures, with good application prospect.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor Under, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the attachment structure schematic diagram of the ultra low temperature overlapping heat pump unit of the utility model.
In figure: 10- low-temperature heating system;11- cryogenic system evaporator;12- heat exchange blower fan;13- cryogenic system gas-liquid point From device;14- cryogenic system compressor;15- evaporative condenser;16- cryogenic system fluid reservoir;17- cryogenic system device for drying and filtering; The second heating power expansion valve of 19-;20- high temperature heating system;23- high-temperature systems gas-liquid separator;24- high-temperature systems compressor;25- High-temperature systems water condenser;26- high-temperature systems fluid reservoir;27- high-temperature systems device for drying and filtering;28- four-way valve;29- economizer; 30- electric expansion valve;The first heating power expansion valve of 31-;32- check valve;The first pipeline of 33-;The second pipeline of 34-;35- major loop; The auxiliary circuit 36-;40- insulated water tank.
Specific embodiment
To keep the purpose of this utility model, technical solution and advantage clearer, below by the technology to the utility model Scheme is described in detail.Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are not before making creative work Obtained all other embodiment is put, the range that the utility model is protected is belonged to.
1 pair of the technical solution of the utility model is described in detail with reference to the accompanying drawings of the specification.
The utility model provides a kind of ultra low temperature overlapping heat pump unit, including low-temperature heating system 10 and high temperature heating system System 20.Wherein, low-temperature heating system 10 and high temperature heating system 20 are commonly connected to evaporative condenser 15 and form overlapping;High temperature Heating system 20 includes high-temperature systems compressor 24 and the Gas-supplying enthalpy-increasing system being connected with high-temperature systems compressor 24, high temperature System compressors 24 be Gas-supplying enthalpy-increasing compressor, with by Gas-supplying enthalpy-increasing system connected to it to high-temperature systems compressor 24 into Row Gas-supplying enthalpy-increasing.Therefore, the ultra low temperature overlapping heat pump unit of the utility model under cryogenic, by low-temperature heating system and The normal operation of air source heat pump system under cryogenic may be implemented in the overlapping of high temperature heating system, and required temperature is made Hot water;Simultaneously in the case where being lower than sub-zero condition of ultralow temperature, by Gas-supplying enthalpy-increasing system to the high temperature of high temperature heating system System compressors carry out Gas-supplying enthalpy-increasing, increase compressor in refrigerant flow, thus in increase system refrigerant heat exchange amount, Realize effective heating under condition of ultralow temperature.
Preferably, as shown in Figure 1, low-temperature heating system includes cryogenic system evaporator 11, cryogenic system gas-liquid separator 13, cryogenic system compressor 14, evaporative condenser 15, cryogenic system fluid reservoir 16, cryogenic system device for drying and filtering 17 and Two heating power expansion valves 19.Preferably, the outlet of cryogenic system evaporator 11 is connected with the import of cryogenic system gas-liquid separator 13 It connects.The outlet of cryogenic system gas-liquid separator 13 is connected to the air inlet of cryogenic system compressor 14.Cryogenic system compressor 14 Exhaust outlet be connected to the low-temperature end import of evaporative condenser 15.The low-temperature end outlet of evaporative condenser 15 is connected to cryogenic system The import of fluid reservoir 16.The outlet of cryogenic system fluid reservoir 16 is connected to cryogenic system device for drying and filtering 17 and the second heating power expansion valve 19.The outlet end of second heating power expansion valve 19 is connected to the import of cryogenic system evaporator 11.Low-temperature heating system further includes changing Air-heater 12.Wherein, the outside of cryogenic system evaporator 11 is arranged in heat exchange blower fan 12.From the low of cryogenic system evaporator 11 Warm low pressure refrigerant enters cryogenic system compressor 14 after cryogenic system gas-liquid separator 13 and forms high temperature and pressure refrigeration Then agent is entered in the evaporative condenser 15 of the condenser as cryogenic system by the exhaust outlet of cryogenic system compressor 14 and is carried out Heat exchange, and enter cryogenic system fluid reservoir 16 after condensed refrigerant liquefaction, it is then dry through cryogenic system device for drying and filtering 17 After dry filtering, it is back to cryogenic system evaporator 11 after 19 reducing pressure by regulating flow of the second heating power expansion valve, into next stage Circulation.
Preferably, as shown in Figure 1, high temperature heating system 20 further includes high-temperature systems gas-liquid separator 23, evaporative condenser 15, high-temperature systems water condenser 25, high-temperature systems fluid reservoir 26 and high-temperature systems device for drying and filtering 27.Wherein, evaporative condenser 15 temperature end outlet is connected with the import of high-temperature systems gas-liquid separator 23.The outlet of high-temperature systems gas-liquid separator 23 connects It is connected to the first air inlet of high-temperature systems compressor 24.The exhaust outlet of high-temperature systems compressor 24 is connected to high-temperature systems water condensation The import of device 25.The outlet of high-temperature systems water condenser 25 is connected to the import of high-temperature systems fluid reservoir 26.High-temperature systems liquid storage The outlet of tank 26 is connected to the import of high-temperature systems device for drying and filtering 27.High-temperature systems device for drying and filtering 27 is connected with four-way valve 28 It connects.High-temperature systems device for drying and filtering 27 is connected with evaporative condenser 15 and Gas-supplying enthalpy-increasing system respectively by four-way valve 28. Electric expansion valve 30 is equipped on the major loop 35 of four-way valve 28 and evaporative condenser 15.Therefore, under cryogenic, high temperature system Unite compressor 24 from the refrigerant from the heat for absorbing evaporative condenser 15 that high-temperature systems gas-liquid separator 23 sucks into Row is compressed into high temperature and high pressure gaseous refrigerant, and is fed through high-temperature systems water condenser 25 by high-temperature systems compressor 24, will be hot Amount is transferred to insulated water tank 40, and the refrigerant liquefaction after exchanging heat enters high-temperature systems fluid reservoir 26, dried through high-temperature systems After 27 dry filter of filter, refrigerant enters four-way valve 28, and returns after 30 reducing pressure by regulating flow of electric expansion valve through major loop 35 The heat of vaporization of air outside fin is absorbed in evaporative condenser 15 at refrigerant vapour, into high-temperature systems gas-liquid separator 23 The first air inlet that high-temperature systems compressor 24 is entered back into after interior carry out gas-liquid separation, carries out the circulation in next stage.
Preferably, Gas-supplying enthalpy-increasing system includes the first heating power expansion valve 31 and economizer 29.From what is connect with four-way valve 28 Pipeline divides two-way to be separately connected the first heating power expansion valve 31 and economizer 29.Wherein the first heating power expansion valve 31 and check valve 32 are logical The first pipeline 33 is crossed to connect with four-way valve 28.First inlet port of economizer 29 is connected by the second pipeline 34 with four-way valve 28 It connects.Preferably, the second input end of economizer 29 is connected between the first heating power expansion valve 31 and check valve 32.Economizer 29 First exit end is connected to major loop 35, and is back to evaporative condenser 15 through electric expansion valve 30.Preferably, economizer 29 Second outlet end is connected to auxiliary circuit 36, and the Gas-supplying enthalpy-increasing air inlet of high-temperature systems compressor 24 is back to through auxiliary circuit 36. Under condition of ultralow temperature, the ultra low temperature overlapping heat pump unit of the utility model enters Gas-supplying enthalpy-increasing operating condition, high-temperature systems compressor 24 are compressed into from the refrigerant from the heat for absorbing evaporative condenser 15 that high-temperature systems gas-liquid separator 23 sucks High temperature and high pressure gaseous refrigerant, and high-temperature systems water condenser 25 is fed through by high-temperature systems compressor 24, it transfers heat to Insulated water tank 40, and the refrigerant liquefaction after exchanging heat enters high-temperature systems fluid reservoir 26, it is dry through high-temperature systems device for drying and filtering 27 After dry filtering, refrigerant enters four-way valve 28, and the refrigerant come out from four-way valve 28 is divided into two parts: the refrigeration of wherein most Agent is flowed according to the process under cryogenic conditions along major loop 35, and another least a portion of refrigerant is divided into again after coming out from four-way valve 28 Two parts, a part are directly entered in economizer 29, after another part is throttled to intermediate pressure by the first heating power expansion valve 31 Into economizer 29.This two parts refrigerant carries out heat exchange in economizer, and the refrigerant for being directly entered economizer 29 is obtaining Major loop 35 is returned to after to further supercooling, and is finally inhaled by the first air inlet of high-temperature systems compressor through electric expansion valve 30 Enter;And it is throttled to by the first heating power expansion valve 31 and enters this some refrigerant of economizer after intermediate pressure and changed in economizer It is sucked after heat by the Gas-supplying enthalpy-increasing air inlet of high-temperature systems compressor, to realize heating operations of the system under ultra low temperature. Refrigerant flow of the raising system under condition of ultralow temperature increases heat exchange amount, obtains the hot water of required temperature.
Preferably, ultra low temperature overlapping heat pump unit further includes hot water switching system, and hot water switching system includes insulated water tank 40.It protects Reservoir 40 is connected with the high temperature water outlet end of high-temperature systems water condenser 25 and low temperature water inlet end respectively.Preferably, exist Water circulating pump is arranged in the low temperature water inlet end of high-temperature systems water condenser 25.So that water energy is enough in insulated water tank and high temperature system It is recycled between system water condenser.
It is high that the ultra low temperature overlapping heat pump unit of the utility model can operate normally generation under low temperature and condition of ultralow temperature Warm water is effectively exchanged heat using superposition type low-temperature heating system and high temperature heating system under cryogenic, to be formed effective High-temperature-hot-water;And under condition of ultralow temperature, by the Gas-supplying enthalpy-increasing system of high temperature heating system to high-temperature systems compressor into The operation of row Gas-supplying enthalpy-increasing increases heat exchange amount, to increase refrigerant flow still to could be formed under condition of ultralow temperature The high-temperature-hot-water of effect.Meanwhile the air source heat pump system of the utility model uses air-source as heat source, with existing electric hot water Device is compared, and has energy-saving and environment-friendly effect.
Above description is only a specific implementation of the present invention, but the protection scope of the utility model is not limited to In this, anyone skilled in the art within the technical scope disclosed by the utility model, can readily occur in variation Or replacement, it should be covered within the scope of the utility model.Therefore, the protection scope of the utility model should be with the power Subject to the protection scope that benefit requires.

Claims (10)

1. a kind of ultra low temperature overlapping heat pump unit, which is characterized in that including low-temperature heating system (10) and high temperature heating system (20), wherein the low-temperature heating system (10) and the high temperature heating system (20) are commonly connected to evaporative condenser (15) And form overlapping;The high temperature heating system (20) include high-temperature systems compressor (24) and with the high-temperature systems compressor (24) the Gas-supplying enthalpy-increasing system being connected, the high-temperature systems compressor (24) is Gas-supplying enthalpy-increasing compressor, by connecting with it The Gas-supplying enthalpy-increasing system connect carries out Gas-supplying enthalpy-increasing to the high-temperature systems compressor (24).
2. ultra low temperature overlapping heat pump unit according to claim 1, which is characterized in that the high temperature heating system (20) is also Including high-temperature systems gas-liquid separator (23), evaporative condenser (15), high-temperature systems water condenser (25), high-temperature systems fluid reservoir (26) and high-temperature systems device for drying and filtering (27), wherein temperature end outlet and the high temperature system of the evaporative condenser (15) The import of system gas-liquid separator (23) is connected;The outlet of the high-temperature systems gas-liquid separator (23) is connected to the high temperature system First air inlet of system compressor (24), the exhaust outlet of the high-temperature systems compressor (24) are connected to the high-temperature systems water cooling The import of condenser (25), the outlet of the high-temperature systems water condenser (25) be connected to the high-temperature systems fluid reservoir (26) into Mouthful;The outlet of the high-temperature systems fluid reservoir (26) is connected to the import of the high-temperature systems device for drying and filtering (27).
3. ultra low temperature overlapping heat pump unit according to claim 2, which is characterized in that the high-temperature systems device for drying and filtering (27) be connected with four-way valve (28), the high-temperature systems device for drying and filtering (27) by the four-way valve (28) respectively with it is described Evaporative condenser (15) and the Gas-supplying enthalpy-increasing system are connected.
4. ultra low temperature overlapping heat pump unit according to claim 3, which is characterized in that the four-way valve (28) with it is described The major loop (35) of evaporative condenser (15) is equipped with electric expansion valve (30).
5. ultra low temperature overlapping heat pump unit according to claim 3, which is characterized in that the Gas-supplying enthalpy-increasing system includes the One heating power expansion valve (31) and economizer (29) divide two-way to be separately connected described the from the pipeline that connect with the four-way valve (28) One heating power expansion valve (31) and the economizer (29);Wherein first heating power expansion valve (31) and check valve (32) pass through the One pipeline (33) is connect with the four-way valve (28);First input end of the economizer (29) passes through the second pipeline (34) and institute State four-way valve (28) connection.
6. ultra low temperature overlapping heat pump unit according to claim 5, which is characterized in that the second of the economizer (29) into Mouth end is connected between first heating power expansion valve (31) and the check valve (32), the first outlet of the economizer (29) End is connected to major loop (35), and the temperature end import of the evaporative condenser (15) is back to through electric expansion valve (30).
7. ultra low temperature overlapping heat pump unit according to claim 6, which is characterized in that the second of the economizer (29) goes out Mouth end is connected to auxiliary circuit (36), and the Gas-supplying enthalpy-increasing of the high-temperature systems compressor (24) is back to through the auxiliary circuit (36) Air inlet.
8. ultra low temperature overlapping heat pump unit according to claim 1, which is characterized in that the low-temperature heating system includes low It is warm system evaporator (11), cryogenic system gas-liquid separator (13), cryogenic system compressor (14), evaporative condenser (15), low Warm system fluid reservoir (16), cryogenic system device for drying and filtering (17) and the second heating power expansion valve (19).
9. ultra low temperature overlapping heat pump unit according to claim 8, which is characterized in that the outlet of the evaporator (11) with The import of the cryogenic system gas-liquid separator (13) is connected;The outlet of the cryogenic system gas-liquid separator (13) is connected to The air inlet of the cryogenic system compressor (14);It is cold that the exhaust outlet of the cryogenic system compressor (14) is connected to the evaporation The low-temperature end outlet of the low-temperature end import of condenser (15), the evaporative condenser (15) is connected to the cryogenic system fluid reservoir (16) import, the outlet of the cryogenic system fluid reservoir (16) are connected to the cryogenic system device for drying and filtering (17) and described Second heating power expansion valve (19);The outlet end of second heating power expansion valve (19) is connected to the import of the evaporator (11); The low-temperature heating system further includes heat exchange blower fan (12).
10. ultra low temperature overlapping heat pump unit according to claim 1, which is characterized in that the ultra low temperature overlapping heat pump machine Group further includes hot water switching system, and the hot water switching system includes insulated water tank (40), the insulated water tank (40) respectively with high temperature The high temperature water outlet end of system water condenser (25) is connected with low temperature water inlet end.
CN201920031760.7U 2019-01-07 2019-01-07 Ultra low temperature overlapping heat pump unit Active CN209371555U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112594952A (en) * 2020-12-16 2021-04-02 宁波爱握乐热能科技有限公司 Ultra-low temperature frequency conversion cascade air source heat pump unit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112594952A (en) * 2020-12-16 2021-04-02 宁波爱握乐热能科技有限公司 Ultra-low temperature frequency conversion cascade air source heat pump unit

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Effective date of registration: 20200122

Address after: No.7, floor 1-2, building 4, Heping community, Longhua street, Tiefeng District, Qiqihar City, Heilongjiang Province

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Patentee before: Li Guowei

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