CN211668054U

CN211668054U - Multistage compression multistage circulation heat pump unit heating and heat storage device

Info

Publication number: CN211668054U
Application number: CN202020184120.2U
Authority: CN
Inventors: 冯建华; 王勇
Original assignee: Zhejiang Bailisheng New Energy Technology Co ltd
Current assignee: Zhejiang Bailisheng New Energy Technology Co ltd
Priority date: 2020-02-19
Filing date: 2020-02-19
Publication date: 2020-10-13
Anticipated expiration: 2030-02-19

Abstract

The utility model discloses a multistage compression multistage circulation heat pump unit heating and heat storage device, which utilizes high energy storage density nanometer phase change material to store energy and can stably and reliably run under extreme environmental conditions; the device adopts step-type temperature grading, and can intelligently (manually) select an air (water) source heat pump heating technology adopting single-stage compression single-stage circulation or multi-stage compression multi-stage circulation according to environmental conditions or the heat utilization temperature and the required energy consumption; meanwhile, the energy storage module of the technical device adopts the nano phase change material with high energy storage density to store heat instead of the traditional water tank to store heat; the system can provide a device with smaller volume than an air (water) source heat pump unit with the same heat supply capacity, can ensure the temperature condition of sufficient phase change heat storage of the phase change material, can further ensure the stable and reliable operation of the system, adopts an air source heat pump mode to absorb heat energy in air for heat storage, and can be made into an energy storage device used in combination with solar energy, waste heat and the like.

Description

Multistage compression multistage circulation heat pump unit heating and heat storage device

Technical Field

The utility model relates to a phase change energy storage and air (water) source heat pump technical field specifically are a multistage compression multistage circulating heat pump set heats heat accumulation device.

Background

The air source heat pump energy storage device has the greatest advantages of energy conservation and environmental protection, and low-temperature heat energy in air is converted into high-temperature heat energy through the compressor. Compared with an electric heater device, the electric heater device can save electric energy to the maximum extent on the basis of the same hot water production amount, and the use cost is only about 1/4 of that of the electric heater device; compared with a gas device, the gas device does not consume any gas fuel, and the use cost is only about 1/3 of the gas energy storage device. The application of the air source heat pump technology can save the use cost of people, and is more suitable for the main body of the world environment protection, which is one of the biggest bright points of the air source heat pump device.

The existing air source heat pump technology has a big problem that the technology is easily influenced by the ambient air environment, and especially when the weather is cold and the ambient temperature is low, the technology is greatly influenced and even cannot be used. Generally, after a refrigerant is selected in a vapor compression type heating cycle, the evaporation pressure is determined by the condensation temperature and the evaporation temperature, the condensation temperature is limited by the environment medium (water or air temperature), and the evaporation temperature is determined by the application of the air source heat pump. When the condensing temperature is increased or the evaporating temperature is reduced, the pressure ratio of the compressor is increased, and due to the existence of the pre-clearance volume of the compressor, the limit compression ratio of the compressor and the limit high exhaust temperature can cause poor lubrication and increase the consumption of the lubricating oil due to the dilution and carbonization of the lubricating oil after the pressure ratio is increased to a certain value; too large compression ratio can also cause the volumetric efficiency to be reduced, so that the heating capacity and the energy efficiency ratio are greatly reduced, the evaporation temperature can not be stably ensured to reach the expected requirement, and the device is not operated normally, and even parts can be damaged.

At present, in the air source heat pump heat storage and supply technology on the market, especially in a large-scale heat utilization occasion, compared with an air source heat pump heating system, because a heat exchanger is directly adopted to heat water, the sensible heat of water is low, the heat storage system can not realize intermittent operation, and can not realize reasonable utilization of electric energy in peak and valley avoidance. In addition, even if the similar technical equipment for storing heat by using the phase-change material is adopted, the problem of overhigh compression ratio of the compressor is not fully considered, and the actual effect cannot be achieved by obtaining stable high temperature to meet the requirement of complete phase-change heat storage of the phase-change material.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a multistage compression multi-stage cycle's heat pump unit heats heat accumulation device to solve the problem that proposes in the above-mentioned background art.

In order to solve the technical problem, the utility model provides a following technical scheme: a heat pump unit heating and heat storage device with multi-stage compression and multi-stage circulation comprises a box body shell, a heat insulation layer, an inner box body, a heat storage bin, a heat conducting medium, a composite phase change material, a water inlet pipe, a water outlet pipe, a secondary condenser, a controller, a secondary temperature sensor, a final condenser inlet, a final condenser outlet, a primary refrigerant inlet, a primary refrigerant outlet, an intermediate buffer heat exchanger, a primary condenser, a secondary evaporator, a medium adding port, a medium discharge port, a primary evaporator, a primary compressor, a primary restrictor, a primary refrigerant tank, a secondary restrictor, a secondary refrigerant tank, a primary three-way valve, a secondary refrigerant inlet, a secondary refrigerant outlet, a fan, a primary refrigerant pipe, a secondary refrigerant pipe, a primary normally-open valve, a secondary normally-closed valve, a secondary three-way valve, a secondary compressor, a primary temperature sensor, a secondary condenser inlet, the heat storage bin is internally provided with a heat storage bin, the heat storage bin is internally provided with a composite phase change material inosculated with the bin body, one side of the heat storage bin and the internal composite phase change material is provided with a secondary temperature sensor, the bottom, the middle or the side surface of the heat storage bin is provided with a terminal heat exchanger, the heat storage bin is also connected with a water inlet and outlet pipe, the water inlet and the water outlet of the water inlet and outlet pipe are arranged at one side of the box body shell, the heat storage bin is also connected with a single-stage circulating refrigerant pipe and a secondary refrigerant pipe, and the joints of the single-stage circulating refrigerant pipe and the secondary refrigerant pipe with the terminal heat exchanger are respectively provided with the single-stage circulating refrigerant inlet and the single-stage circulating refrigerant outlet as well as the secondary condenser inlet and the secondary condenser outlet, the heat storage bin is connected with an intermediate buffer heat exchanger through a single-stage circulating refrigerant pipe and a secondary refrigerant pipe, the intermediate buffer heat exchanger is positioned at the top of the inner box body, the intermediate buffer heat exchanger is a primary condenser and a secondary evaporator which are arranged in a closed box body, a heat-conducting medium and a primary temperature sensor are also arranged in the box body, the primary condenser and the secondary evaporator are respectively communicated with the primary refrigerant pipe and the secondary refrigerant pipe, a primary refrigerant inlet and a primary refrigerant outlet are arranged at the joint of the primary refrigerant pipe and the closed box body, a secondary refrigerant inlet and a secondary refrigerant outlet are arranged at the joint of the secondary refrigerant pipe and the closed box body, a primary normally-open valve and a secondary normally-open valve are respectively arranged on one side of the primary refrigerant pipe close to the primary refrigerant inlet and the primary refrigerant outlet, and a primary three-way valve and a secondary three-way valve are respectively arranged on the primary refrigerant pipe outside the primary normally-open valve and the secondary normally-open valve, the primary three-way valve and the secondary three-way valve are further connected with the head end and the tail end of the single-stage circulating refrigerant pipe, a primary normally-closed valve and a secondary normally-closed valve are respectively installed on the single-stage circulating refrigerant pipe close to the joint, two ends of the primary refrigerant pipe are respectively communicated with the primary three-way valve and the secondary three-way valve, a primary compressor, a primary evaporator, a primary throttle and a primary refrigerant tank are sequentially connected onto the primary refrigerant pipe in series, a fan is further arranged at the top end of the primary evaporator, a secondary throttle and a secondary compressor are respectively installed on one side, close to the secondary refrigerant inlet and the secondary refrigerant outlet, of the secondary refrigerant pipe, a secondary refrigerant tank is installed on one side, close to the secondary condenser outlet, of the secondary condenser outlet, a controller is installed on one side of the outer portion of the box body shell, and the controller is respectively connected with a secondary, The primary condenser, the secondary evaporator, the primary compressor, the primary throttle device, the primary refrigerant tank, the secondary throttle device, the secondary refrigerant tank, the primary three-way valve, the fan, the primary normally-open valve, the secondary normally-open valve, the primary normally-closed valve, the secondary three-way valve, the secondary compressor and the primary temperature sensor are electrically connected.

Furthermore, the heat preservation layer is arranged on the inner wall of the box body shell or is coated on the outer side of the inner box body, and the heat preservation layer is made of polyurethane foam, polyethylene foam or rock wool.

Further, the heat-conducting medium is water.

Furthermore, the composite phase-change material is a high-energy-storage-density nano composite phase-change material with a tangible heat storage inner core, and the phase-change temperature of the composite phase-change material is within the range of 20-118 ℃.

Furthermore, a water inlet and a water outlet are also formed in the water inlet and outlet pipe.

Furthermore, the middle buffer heat exchanger is one or a combination of a fin condensation heat exchanger and a tube condensation heat exchanger, and a medium adding port and a medium discharging port are further arranged on the middle buffer heat exchanger.

Furthermore, the tail end heat exchanger is one or a combination of a fin condensation heat exchanger and a tube array condensation heat exchanger, and is respectively communicated with the primary refrigerant tube through a single-stage circulating refrigerant tube to be connected with the primary heat exchanger and connected with the middle buffer heat exchanger through a secondary refrigerant tube.

Furthermore, one path of refrigerant pipeline additionally arranged in the single-stage circulating refrigerant pipeline system in the tail end heat exchanger in the heat storage bin allows the normally-opened valve to be closed and the normally-closed valve to be opened under working conditions, and the air (water) energy heat pump unit with multi-stage compression and multi-stage circulation can be converted into the air energy heat pump system with single-stage compression and single-stage circulation to operate.

Furthermore, the high-energy-storage-density and high-thermal-conductivity composite phase change material in the energy storage device is preferably made of an inorganic phase change material with higher phase change latent heat and thermal conductivity superior to that of an organic phase change material and a high-thermal-conductivity support structure material under specific temperature and pressure conditions. The inorganic phase-change heat storage material for the energy storage device is mainly a hydrated salt phase-change material, and because the inorganic phase-change material can generate supercooling and phase separation in the phase-change heat storage-heat release process, people adopt the inorganic phase-change heat storage materialThe composite phase-change material is prepared by adding a thickening agent and a nucleating agent. The selected inorganic phase change material is mainly one or the combination of more than one of the following materials: sodium sulfate decahydrate Na₂SO₄·10H₂O, barium hydroxide octahydrate Ba (OH)₂·8H₂O, chromium nitrate tetrahydrate Cd (NO)₃)₂·4H₂O, ammonium alum NH₄Al(SO₄)₂·12H₂O, Potassium aluminum sulfate dodecahydrate KAl (SO)₄)₂·12H₂O, sodium carbonate decahydrate Na₂CO₃·10H₂O, sodium tetraborate Na₂B4O₇·10H₂Potassium phosphate K, heptahydrate₃PO₄·7H₂O, sodium acetate trihydrate CH₃COONa·3H₂O, sodium hydrogen phosphate decahydrate Na₂HPO₄·10H₂O, aluminum sulfate Octadecahydrate AI (SO)₄)3·18H₂Disodium hydrogen phosphate O, decahydrate Na₂HPO₄·10H₂O, calcium chloride hexahydrate CaCl₂·6H₂O, magnesium nitrate hexahydrate Mg (NO)₃)₂·6H₂O, and the like. With sodium pyrophosphate Na₄P₂O₇·10H₂O or barium carbonate BaCO₃As nucleating agent, sodium carboxymethylcellulose C is used₆H₇O₂(OH)₂CH₂COONa is a thickening agent and is made into a composite phase-change material under a certain working condition. The phase transition temperature is in the range of 20-118 ℃.

Further, the high-energy-storage-density high-thermal-conductivity nano phase change material in the energy storage device can also be prepared by an organic phase change material and a high-thermal-conductivity support structure material under specific temperature and pressure conditions. The organic phase change material is one or a combination of several materials, such as polyethylene glycol of alcohols, erythritol, palmitic acid, decanoic acid, lauric acid of fatty acids and paraffin wax of alkanes. The composite sizing phase-change material with different molecular weights and high energy storage density is prepared by a physical absorption and additional melting blending method with an Expanded Graphite (EG) or activated carbon particle (ACG) support material with good adsorptivity and thermal conductivity.

Compared with the prior art, the utility model discloses the beneficial effect who reaches is: the heat pump unit heating and heat storage device with the multi-stage compression and multi-stage circulation solves the problems that high-grade hot water is difficult to provide and the compressor is unstable to operate when the environment temperature is low or because a single-stage compression air source heat pump is adopted or because phase-change materials are adopted for energy storage. When the outdoor temperature is low and the temperature difference between hot water required by life production and outdoor air is too large, the pressure difference of the working of the compressor is often too large, when the pressure difference is more than 12-14 and the pressure ratio is more than 8-10, poor lubrication and part damage caused by thinning and carbonization of lubricating oil and the like due to the fact that the pressure difference of the compressor exceeds an allowable value can happen to the single-stage compressor, and the volumetric efficiency and the thermal efficiency are greatly reduced due to the fact that the pressure ratio is too large. In order to achieve lower evaporation temperature difference, a heat pump circulating system adopting a two-stage or multi-stage compressor is an effective measure for solving the problems of the existing products and technologies; the problems of less energy storage (sensible heat) and low heat storage efficiency of the existing water tank type energy storage in the market are solved by adopting the phase-change energy storage material heat storage technology; the problem of the non fossil energy high efficiency utilization that millet electricity etc. have the discontinuity characteristics is solved to reply global climate change and environmental pollution administers, reduce disposable fossil energy use amount, realize low carbon development, solved the limited problem of other products and technique in practical application, the multistage air source heat pump system of compressing multistage circulation has simultaneously solved the problem that the air source heat pump of single-stage compression multistage circulation gives the phase transition heat-retaining difficulty.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic view of the overall plane structure of the present invention;

fig. 2 is a schematic view of the overall internal structure of the present invention;

in the figure: 1. a case body shell; 2. a heat-insulating layer; 3. an inner box body; 4. a heat storage bin; 5. a heat-conducting medium; 6. a composite phase change material; 7. a water inlet pipe and a water outlet pipe; 8. a secondary condenser; 9. a controller; 10. a secondary temperature sensor; 11. a water inlet; 12. a water outlet; 13. a first-stage refrigerant inlet; 14. a first-stage refrigerant outlet; 15. an intermediate buffer heat exchanger; 16. a first-stage condenser; 17. a secondary evaporator; 18. a media loading port; 19. a medium discharge port; 20. a primary evaporator; 21. a first stage compressor; 22. a primary throttle; 23. a first-stage refrigerant tank; 24. a secondary choke; 25. a secondary refrigerant tank; 26. a first-stage three-way valve; 27. A secondary refrigerant inlet; 28. a secondary refrigerant outlet; 29. a fan; 30. a first-stage refrigerant pipe; 31. a secondary refrigerant pipe; 32. a first-stage normally open valve; 33. a secondary normally open valve; 34. a first-stage normally-closed valve; 35. a secondary normally closed valve; 36. a secondary three-way valve; 37. a secondary compressor; 38. a primary temperature sensor; 39. a secondary condenser inlet; 40. a secondary condenser outlet; 41. a single-stage circulating refrigerant inlet; 42. a single-stage circulating refrigerant outlet; 43. a single-stage circulating refrigerant pipe; 44. a terminal heat exchanger.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-2, the present invention provides a technical solution: a heat pump unit heating and heat storage device with multi-stage compression and multi-stage circulation comprises a box body shell 1, a heat insulation layer 2, an inner box body 3, a heat storage bin 4, a heat conducting medium 5, a composite phase change material 6, a water inlet and outlet pipe 7, a secondary condenser 8, a controller 9, a secondary temperature sensor 10, a water inlet 11, a water outlet 12, a primary refrigerant inlet 13, a primary refrigerant outlet 14, an intermediate buffer heat exchanger 15, a primary condenser 16, a secondary evaporator 17, a medium adding port 18, a medium discharge port 19, a primary evaporator 20, a primary compressor 21, a primary restrictor 22, a primary refrigerant tank 23, a secondary restrictor 24, a secondary refrigerant tank 25, a primary three-way valve 26, a secondary refrigerant inlet 27, a secondary refrigerant outlet 28, a fan 29, a primary refrigerant pipe 30, a secondary refrigerant pipe 31, a primary normally open valve 32, a secondary normally open valve 33, a primary normally open valve 34 and a secondary normally closed valve 35, A secondary three-way valve 36, a secondary compressor 37, a primary temperature sensor 38, a secondary condenser inlet 39, a secondary condenser outlet 40, a single-stage circulating refrigerant inlet 41, a single-stage circulating refrigerant outlet 42, a single-stage circulating refrigerant pipe 43 and a terminal heat exchanger 44, wherein the inner wall of the box body shell 1 is provided with an inner box body 3, a heat preservation layer 2 is arranged between the box body shell 1 and the inner box body 3, the heat preservation layer 2 is arranged on the inner wall of the box body shell 1 or covers the outer side of the inner box body 3, the heat preservation layer 2 is selected from polyurethane foam, polyethylene foam or rock wool, a heat storage bin 4 is arranged in the inner box body 3, a composite phase change material 6 which is inosculated with the bin body of the heat storage bin is arranged in the heat storage bin 4, the composite phase change material 6 is a high energy storage density nano composite phase change material with a tangible heat storage inner core, a secondary temperature sensor 10 is arranged at one side of the heat storage bin 4 and the composite phase change material 6 inside the heat storage bin 4, a tail end heat exchanger 44 is arranged at the bottom, the middle or the side of the heat storage bin 4, the heat storage bin 4 is also connected with a water inlet and outlet pipe 7, a single-stage circulating refrigerant pipe 43 and a secondary refrigerant pipe 31, a single-stage circulating refrigerant inlet 41 and a single-stage circulating refrigerant outlet 42 are respectively arranged at the connection part of the single-stage circulating refrigerant pipe 43 and the secondary refrigerant pipe 31 and the box body where the tail end heat exchanger 44 is arranged, a secondary condenser inlet 39 and a secondary condenser outlet 40 are respectively arranged, a water inlet 11 and a water outlet 12 are also arranged on the water inlet and outlet pipe 7, the heat storage bin 4 is connected with an intermediate buffer heat exchanger 15 through the single-stage circulating refrigerant pipe 43 and the secondary refrigerant pipe 31, the intermediate buffer heat exchanger 15 is, a heat-conducting medium 5 and a primary temperature sensor 38 are also arranged in the box body, the intermediate buffer heat exchanger 15 is a fin condensing heat exchanger, a tube array condensing heat exchanger or a combination thereof, a medium adding port 18 and a medium discharging port 19 are also arranged on the intermediate buffer heat exchanger 15, the heat-conducting medium 5 is water, the primary condenser 16 and the secondary evaporator 17 are respectively communicated with a primary refrigerant tube 30 and a secondary refrigerant tube 31, a primary refrigerant inlet 13 and a primary refrigerant outlet 14 are arranged at the joint of the primary refrigerant tube 30 and the closed box body, a secondary refrigerant inlet 27 and a secondary refrigerant outlet 28 are arranged at the joint of the secondary refrigerant tube 31 and the closed box body, a primary normally-open valve 32 and a secondary normally-open valve 33 are respectively arranged on one side of the primary refrigerant tube 30 close to the primary refrigerant inlet 13 and the primary refrigerant outlet 14, and a primary three-way valve 26 and a secondary three-way valve 36 are respectively arranged on the primary refrigerant tube 30 outside the primary normally-open valve 32 and the secondary normally-open valve 33, the primary three-way valve 26 and the secondary three-way valve 36 are further connected with the head and the tail of the single-stage circulating refrigerant pipe 43, the primary normally-closed valve 34 and the secondary normally-closed valve 35 are respectively installed on the single-stage circulating refrigerant pipe 43 close to the connection position, two ends of the primary refrigerant pipe 30 are respectively communicated with the primary three-way valve 26 and the secondary three-way valve 36, the primary compressor 21, the primary evaporator 20, the primary throttle 22 and the primary refrigerant tank 23 are sequentially connected on the primary refrigerant pipe 30 in series, the fan 29 is further arranged at the top end of the primary evaporator 20, the secondary throttle 24 and the secondary compressor 37 are respectively installed on one side of the secondary refrigerant pipe 31 close to the secondary refrigerant inlet 27 and the secondary refrigerant outlet 28, the secondary refrigerant tank 25 is installed on one side of the secondary refrigerant pipe 31 close to the secondary condenser outlet 40, the controller 9 is installed on one side of the outer portion of the box body shell 1, and the controller 9, The secondary temperature sensor 10, the intermediate buffer heat exchanger 15, the primary condenser 16, the secondary evaporator 17, the primary evaporator 20, the primary compressor 21, the primary throttle 22, the primary refrigerant tank 23, the secondary throttle 24, the secondary refrigerant tank 25, the primary three-way valve 26, the fan 29, the primary normally open valve 32, the secondary normally open valve 33, the primary normally closed valve 34, the secondary normally closed valve 35, the secondary three-way valve 36, the secondary compressor 37 and the primary temperature sensor 38 are electrically connected; when the device is used for heat storage or needs to continuously work in a low-temperature environment, a main power supply is connected, the device is started through the controller 9, the system automatically enters inspection, the inspection of the system is normal, the fan 29 works, the primary compressor 21 works, air absorbs low-temperature heat energy in the air from the air inlet side through the primary evaporator 20 under the action of the fan 29 to heat and evaporate low-boiling-point refrigerants in the primary refrigerant pipe 30, refrigerant steam in the primary refrigerant pipe 30 is compressed into high-temperature and high-pressure gas through the primary compressor 21, the high-temperature and high-pressure gas enters the intermediate buffer heat exchanger 15 through the primary condenser 16 to exchange heat and release heat to the heat-conducting medium 5 through the primary compressor 21, the refrigerant in the primary refrigerant pipe 30 is cooled and then enters the primary refrigerant tank 23 through the primary refrigerant outlet 14, and then enters the primary refrigerant tank 23 through the primary restrictor 22 for throttling, pressure reduction and cooling, and then enters the primary compressor 21 through the primary evaporator 20 for heat exchange, entering the next cycle;

meanwhile, the primary temperature sensor 38 transmits a temperature signal to the controller 9, under the control condition that the logical relationship is met, the secondary circulation system is started, the secondary evaporator 17 in the intermediate buffer heat exchanger 15 absorbs intermediate-temperature heat, the refrigerant in the intermediate-temperature secondary refrigerant pipe 31 is compressed into high-temperature high-pressure gas from the secondary evaporator outlet 17 through the secondary compressor 37, the refrigerant in the secondary refrigerant pipe 31 releases heat in the secondary condenser 8, and the high-temperature heat energy is released to the heat storage bin 4 to further heat and store heat for the composite phase change material 6; the refrigerant in the secondary refrigerant pipe 31 enters the secondary refrigerant tank 25 through the secondary condenser outlet 40 after being cooled, is throttled, depressurized and cooled by the secondary throttler 24, returns to the intermediate buffer heat exchanger 15 through the inlet of the secondary evaporator 17, absorbs heat by the secondary evaporator 17, is compressed by the secondary compressor 37, and enters the next cycle; when the temperature of the high-energy-storage-density composite phase-change material 6 exceeds the phase-change temperature or reaches or exceeds the set temperature during the operation of the system device, a signal is transmitted to the controller 9 through the secondary temperature sensor 10, and the secondary compressor 37 or the primary compressor 21 is automatically controlled to intermittently operate according to the logical relation of the database;

under another condition, when the single-stage compression single-stage circulation condition is met, the system can be automatically or manually switched into a single-stage compression single-stage circulation mode. In the single-stage circulation mode, the first-stage normally-open valve 32 and the second-stage normally-open valve 33 are automatically (manually) closed, and the first-stage normally-closed valve 34 and the second-stage normally-closed valve 35 are automatically (manually) opened, so that the single-stage circulation mode enters a third circulation mode in which the first-stage condenser 16 of the first circulation stops working, the secondary condenser 8 of the second circulation enters a condensation circulation, and the secondary compressor 37 of the second circulation stops working;

when hot water is used, cold water enters the heat storage inner box body 3 through the water inlet 11 to absorb heat of the high-energy-storage-density composite phase change material 6, the cold water is heated to high-temperature hot water along with continuous absorption of heat energy, and the high-temperature hot water flows out through the water outlet 12; the nano composite phase change material 6 with high energy storage density and high heat conductivity continuously releases heat, when the temperature is reduced to be below the phase change temperature or within the temperature compensation temperature range set by the system, the secondary temperature sensor 10 transmits a signal to the controller 9, the controller 9 starts the corresponding compressor to work according to an instruction and further supplements heat for the heat storage system, and meanwhile, the normal hot water supply is met; the temperature is sensed by an overheating-prevention temperature sensing probe of the secondary temperature sensor 10, and the system automatically switches corresponding controlled equipment and devices to complete automatic control according to a control main body which accords with a logical relation in a reasonable temperature interval which ensures that the complete phase change of the composite phase change material 6 is completed under the control of the controller 9, so that overheating incapability of the composite phase change material 6 is prevented or the service life is reduced, and the automatic start-stop time of the air (water) source heat pump unit system can be set through the controller 9 for the purpose of avoiding peaks and valleys.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-stage compression and multi-stage circulation heat pump unit heating and heat storage device comprises a box body shell (1), a heat preservation layer (2), an inner box body (3), a heat storage bin (4), a heat conducting medium (5), a composite phase change material (6), a water inlet pipe (7), a secondary condenser (8), a controller (9), a secondary temperature sensor (10), a water inlet (11), a water outlet (12), a primary refrigerant inlet (13), a primary refrigerant outlet (14), an intermediate buffer heat exchanger (15), a primary condenser (16), a secondary evaporator (17), a medium adding port (18), a medium discharge port (19), a primary evaporator (20), a primary compressor (21), a primary throttle (22), a primary refrigerant tank (23), a secondary throttle (24), a secondary refrigerant tank (25), a primary three-way valve (26), a secondary refrigerant inlet (27), Secondary refrigerant outlet (28), fan (29), primary refrigerant pipe (30), secondary refrigerant pipe (31), primary normally open valve (32), secondary normally open valve (33), primary normally closed valve (34), secondary normally closed valve (35), secondary three-way valve (36), secondary compressor (37), primary temperature sensor (38), secondary condenser entry (39), secondary condenser export (40), single-stage circulation refrigerant entry (41), single-stage circulation refrigerant export (42), single-stage circulation refrigerant pipe (43) and terminal heat exchanger (44), its characterized in that: the inner wall of the box body shell (1) is provided with an inner box body (3), a heat insulation layer (2) is arranged between the box body shell (1) and the inner box body (3), a heat storage bin (4) is arranged in the inner box body (3), a composite phase change material (6) which is matched with a bin body of the heat storage bin is arranged in the heat storage bin (4), a secondary temperature sensor (10) is arranged on one side of the heat storage bin (4) and the composite phase change material (6) inside the heat storage bin, a terminal heat exchanger (44) is arranged at the bottom, the middle or the side of the heat storage bin (4), the terminal heat exchanger (44) is further connected with a single-stage circulating refrigerant pipe (43) and a secondary refrigerant pipe (31), and a single-stage circulating refrigerant inlet (41) and a single-stage circulating outlet (42) are respectively arranged at the joint of the single-stage circulating refrigerant pipe (43) and the secondary, A secondary condenser inlet (39) and a secondary condenser outlet (40), wherein the heat storage bin (4) is connected with an intermediate buffer heat exchanger (15) through a single-stage circulating refrigerant pipe (43) and a secondary refrigerant pipe (31), the intermediate buffer heat exchanger (15) is positioned at the top of the inner box body (3), the intermediate buffer heat exchanger (15) is a primary condenser (16) and a secondary evaporator (17) which are arranged in a closed box body, a heat-conducting medium (5) and a primary temperature sensor (38) are also arranged in the box body, the primary condenser (16) and the secondary evaporator (17) are respectively communicated with a primary refrigerant pipe (30) and a secondary refrigerant pipe (31), a primary refrigerant inlet (13) and a primary refrigerant outlet (14) are arranged at the joint of the primary refrigerant pipe (30) and the closed box body, and a secondary refrigerant inlet (27) and a secondary outlet (28) are arranged at the joint of the secondary refrigerant pipe (31) and the closed box body, the refrigerant compressor is characterized in that a primary normally-open valve (32) and a secondary normally-open valve (33) are respectively installed on one side, close to a primary refrigerant inlet (13) and a primary refrigerant outlet (14), of the primary refrigerant pipe (30), a primary three-way valve (26) and a secondary three-way valve (36) are respectively installed on the primary refrigerant pipe (30) on the outer sides of the primary normally-open valve (32) and the secondary normally-open valve (33), the primary three-way valve (26) and the secondary three-way valve (36) are connected with the head end and the tail end of a single-stage circulating refrigerant pipe (43), a primary normally-closed valve (34) and a secondary normally-closed valve (35) are respectively installed on the single-stage circulating refrigerant pipe (43) close to the joint, two ends of the primary refrigerant pipe (30) are respectively communicated with the primary three-way valve (26) and the secondary refrigerant (36), and a primary compressor (21), a primary evaporator (20) and a secondary evaporator (36) are sequentially connected with the, Primary throttle ware (22) and primary refrigerant jar (23), primary evaporator (20) top still is provided with fan (29), secondary throttle ware (24) and secondary compressor (37) are installed respectively to one side that is close to secondary refrigerant import (27) and secondary refrigerant export (28) on secondary refrigerant pipe (31), and secondary refrigerant jar (25) are installed to one side that is close to secondary condenser export (40) on secondary refrigerant pipe (31), controller (9) are installed to outside one side of box shell (1), and controller (9) respectively with secondary condenser (8), secondary temperature sensor (10), middle buffer heat exchanger (15), primary condenser (16), secondary evaporator (17), primary evaporator (20), primary compressor (21), primary refrigerant (22), primary refrigerant jar (23), secondary throttle ware (24), The secondary refrigerant tank (25), the primary three-way valve (26), the fan (29), the primary normally open valve (32), the secondary normally open valve (33), the primary normally closed valve (34), the secondary normally closed valve (35), the secondary three-way valve (36), the secondary compressor (37) and the primary temperature sensor (38) are electrically connected.

2. The heating and heat storage device of the multistage compression multistage circulation heat pump unit according to claim 1, characterized in that: the heat preservation layer (2) is arranged on the inner wall of the box body shell (1) or is coated on the outer side of the inner box body (3), and the heat preservation layer (2) is made of polyurethane foam, polyethylene foam or rock wool.

3. The heating and heat storage device of the multistage compression multistage circulation heat pump unit according to claim 1, characterized in that: the heat-conducting medium (5) is water.

4. The heating and heat storage device of the multistage compression multistage circulation heat pump unit according to claim 1, characterized in that: the composite phase-change material (6) is a high-energy-storage-density nano composite phase-change material with a tangible heat storage inner core, and the phase-change temperature of the composite phase-change material (6) is within the range of 20-118 ℃.

5. The heating and heat storage device of the multistage compression multistage circulation heat pump unit according to claim 1, characterized in that: the water inlet and outlet pipe (7) is also provided with a water inlet (11) and a water outlet (12).

6. The heating and heat storage device of the multistage compression multistage circulation heat pump unit according to claim 1, characterized in that: the middle buffer heat exchanger (15) is one or a combination of a fin condensation heat exchanger and a tube condensation heat exchanger, and a medium adding port (18) and a medium discharging port (19) are further arranged on the middle buffer heat exchanger (15).

7. The heating and heat storage device of the multistage compression multistage circulation heat pump unit according to claim 1, characterized in that: the tail end heat exchanger (44) is one or a combination of a fin condensation heat exchanger and a tube array condensation heat exchanger, and is respectively communicated with the primary refrigerant tube (30) through a single-stage circulating refrigerant tube (43) to be connected with the primary heat exchanger and connected with the middle buffer heat exchanger (15) through a secondary refrigerant tube (31).