Double-heat-source cascade high-low-temperature heat pump heating system

Abstract

The utility model discloses a double heat source cascade high and low temperature heat pump heating system which comprises a first heat pump unit and a second heat pump unit, and the first heat pump unit comprises a first heat exchanger and a second heat exchanger which are connected through a first heat energy conversion unit; the second heat pump unit comprises a third heat exchanger and a fourth heat exchanger which are connected through a second heat energy conversion unit; the output end of the fourth heat exchanger is connected with the first pipe orifice, and the output end of the second heat exchanger is selectively connected with the input end of the third heat exchanger or the first pipe orifice through a first control valve; the second pipe orifice is connected with the input end of the second heat exchanger and the input end of the fourth heat exchanger; the third pipe opening is connected with the input end of the third heat exchanger. Based on the heating system, waste heat recovery and energy conservation can be achieved under the condition that the requirements of users for different heating temperatures are met, and the heating efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to heat pump heating technical field especially relates to double heat source superposition's high and low temperature heat pump heating system. BACKGROUND

[0002] Heat pump unit is a kind of heating equipment, it is through the compression refrigeration cycle, utilize low heat source, such as air, water, soil etc., with a small amount of high-level power input, realize low heat energy to high heat energy transfer, to be used for heating or supply hot water, common heat pump unit includes air source heat pump unit and water source heat pump unit etc..Among them, air source heat pump unit is a kind of energy in air as low temperature heat source, carries out heat exchange by condenser or evaporator, again through the circulation system in building extracts or releases heat to satisfy user heating or refrigeration demand room temperature regulating unit, and water source heat pump unit is the equipment using water as heat source to carry out refrigeration or heating cycle.

[0003] When heating for use user, the heating speed of traditional air source heat pump unit is relatively slow, and because it is based on energy in air as heat source, therefore, the influence of ambient temperature is also larger, in extremely cold or warm climate conditions, its performance can be significantly influenced, leading to heating efficiency drop or energy consumption increase.Secondly, for traditional water source heat pump unit, its overall energy efficiency is low, and the seasonal fluctuation of complex water circulation system and the water source temperature acting as heat source limits the improvement of its heating efficiency to some extent, and energy utilization efficiency is not satisfactory.Two kinds of heat pump units cannot freely supply corresponding high-temperature hot water or low-temperature hot water according to user demand, difficult to meet the needs of different application scenarios under wide ambient temperature, and each unit generally does not have waste heat recovery capacity, and energy efficiency is low. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of double heat source superposition's high and low temperature heat pump heating system that can meet different heating needs of user and can realize waste heat utilization simultaneously, energy-efficient.

[0005] To achieve the above object, the utility model discloses a kind of double heat source superposition's high and low temperature heat pump heating system, it includes:

[0006] First heat pump unit and second heat pump unit, the first heat pump unit includes the first heat exchanger and second heat exchanger connected by first heat energy conversion unit, the first heat exchanger is used to extract low heat energy in first medium, the second heat exchanger is used to output high heat energy;

[0007] The second heat pump unit includes the third heat exchanger and fourth heat exchanger connected by second heat energy conversion unit, the third heat exchanger is used to extract low heat energy in second medium, the fourth heat exchanger is used to output high heat energy;

[0008] a first port for outputting heat transfer medium for heating for a user;

[0009] an output end of the fourth heat exchanger is connected with the first port, and an output end of the second heat exchanger is selectively connected with an input end of the third heat exchanger or the first port through a first control valve;

[0010] a second port connected with an input end of the second heat exchanger and an input end of the fourth heat exchanger, for providing heat transfer medium to be heated for the second heat exchanger and the fourth heat exchanger;

[0011] a third port connected with an input end of the third heat exchanger, for providing the second medium meeting the requirement of a heat source for the third heat exchanger.

[0012] Optionally, the first port is selectively connected with an output end of the second heat exchanger or an output end of the fourth heat exchanger through a second control valve.

[0013] Optionally, an input end of the second heat exchanger is selectively connected with an output end of the third heat exchanger or the second port through a third control valve.

[0014] Optionally, a fourth control valve is further arranged between the first control valve and the input end of the third heat exchanger, and the input end of the third heat exchanger is selectively connected with the first control valve or the third port through the fourth control valve.

[0015] Optionally, the heating system further comprises a fourth port for leading out the second medium after heat exchange, a fifth control valve is further arranged between the third control valve and an output end of the third heat exchanger, and the output end of the third heat exchanger is selectively connected with the third control valve or the fourth port through the fifth control valve.

[0016] Optionally, the second port is selectively connected with the input end of the second heat exchanger and the input end of the fourth heat exchanger through a sixth control valve.

[0017] Optionally, a first water pump is further arranged between the input end of the second heat exchanger and the third control valve.

[0018] Optionally, a second water pump is further arranged between the third port and the fourth control valve.

[0019] Optionally, a buffer water tank is further arranged between the fourth control valve and the input end of the third heat exchanger.

[0020] Optionally, the first heat energy conversion unit comprises a four-way valve, an oil separator, an oil return capillary, an air source compressor, a heat exchange fan, an air-liquid separator, a first expansion valve, a second expansion valve, a liquid cooling drive, and an economizer; and the second heat energy conversion unit comprises a water source compressor and a third expansion valve.

[0021] Compared with the prior art, the double-heat-source cascade high-low temperature heat pump heating system can start the first heat pump unit or the second heat pump unit or simultaneously start the two heat pump units to heat the user based on the actual heating demand of the user, and the double-heat-source cascade heat pump unit can better adapt to different temperature conditions in a wide range of different application scenarios, so that a more energy-efficient and environmentally friendly heating mode is adopted. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 FIG. 1 is a system structure diagram of the heating system of the embodiment of the present application.

[0023] Figure 2 FIG. 2 is a structure schematic diagram of the first heat pump unit alone running of the embodiment of the present application.

[0024] Figure 3 FIG. 3 is a structure schematic diagram of the second heat pump unit alone running when there is a waste heat water source of the embodiment of the present application.

[0025] Figure 4 FIG. 4 is a structure schematic diagram of the first heat pump unit and the second heat pump unit simultaneously running of the embodiment of the present application. DETAILED DESCRIPTION

[0026] To explain the technical content, structural features, purposes and effects of the present application in detail, the following will be described in detail in combination with the embodiments and the accompanying drawings.

[0027] The embodiment discloses a double-heat-source cascade high-low temperature heat pump heating system to efficiently provide the user with the required hot water for heating and realize the recycling of waste heat.

[0028] Referring to Figure 1 The double-heat-source cascade high-low temperature heat pump heating system in the embodiment comprises a first heat pump unit 1, a second heat pump unit 2, a first pipe port 31, a second pipe port 32, a third pipe port 41, and a first control valve A.

[0029] The first heat pump unit 1 includes a first heat exchanger 11 and a second heat exchanger 12 connected via a first heat energy conversion unit. The first heat exchanger 11 extracts low-grade heat energy from a first medium, and the second heat exchanger 12 outputs high-grade heat energy. The second heat pump unit 2 includes a third heat exchanger 21 and a fourth heat exchanger 22 connected via a second heat energy conversion unit. The third heat exchanger 21 extracts low-grade heat energy from a second medium, and the fourth heat exchanger 22 outputs high-grade heat energy. A first port 31 outputs the heat transfer medium for heating users. The output end of the fourth heat exchanger 22 is connected to the first port 31. The output end of the second heat exchanger 12 is selectively connected to the input end of the third heat exchanger 21 or the first port 31 via a first control valve A. A second port 32 is connected to the input ends of the second heat exchanger 12 and the fourth heat exchanger 22, providing the heat transfer medium to be heated to the second heat exchanger 12 and the fourth heat exchanger 22. The third port 41 is connected to the input end of the third heat exchanger 21 and is used to provide the third heat exchanger 21 with a second medium that meets the requirements of a heat source.

[0030] In this embodiment, the first heat pump unit 1 is an air source heat pump unit, the second heat pump unit 2 is a water source heat pump unit, the heat transfer medium for heating users is water, the first medium is air, the second medium is water, and the third pipe port 41 is used to transmit waste water sources (such as groundwater, medium-temperature water left over from industrial production processes, etc.) that can be used to extract heat energy to the third heat exchanger 21.

[0031] See Figure 2 As shown, when a user needs low-temperature hot water (30~60℃), the heating system directly heats the user by driving the first heat pump unit 1. Under the action of the first heat energy conversion unit, the first heat exchanger 11 absorbs the low-grade heat energy of the first medium, and the second heat exchanger 12 outputs high-grade heat energy to heat the heat transfer medium flowing through the second heat exchanger 12. At this time, the output end of the second heat exchanger 12 is connected to the first pipe port 31 through the first control valve A. The heated heat transfer medium is output from the output end of the second heat exchanger 12 and heats the user through the first pipe port 31.

[0032] See Figure 3As shown, when there is a waste heat source, the heating system drives the second heat pump unit 2 to heat the user. At this time, the heat transfer medium to be heated is input from the second pipe port 32 to the input end of the fourth heat exchanger 22, the waste heat source serving as the second medium flows from the third pipe port 41 to the input end of the third heat exchanger 21, the third heat exchanger 21 absorbs the low-grade heat energy of the waste heat source, and under the action of the second heat energy conversion unit, the high-grade heat energy is output in the fourth heat exchanger 22 to heat the heat transfer medium entering the fourth heat exchanger 22, and the heated heat transfer medium is output from the output end of the fourth heat exchanger 22 and directly heats the user through the first pipe port 31;

[0033] Referring to Figure 4 As shown, when there is a waste heat source, the heating system drives the second heat pump unit 2 to heat the user. At this time, the heat transfer medium to be heated is input from the second pipe port 32 to the input end of the fourth heat exchanger 22, the waste heat source serving as the second medium flows from the third pipe port 41 to the input end of the third heat exchanger 21, the third heat exchanger 21 absorbs the low-grade heat energy of the waste heat source, and under the action of the second heat energy conversion unit, the high-grade heat energy is output in the fourth heat exchanger 22 to heat the heat transfer medium entering the fourth heat exchanger 22, and the heated heat transfer medium is output from the output end of the fourth heat exchanger 22 and directly heats the user through the first pipe port 31;

[0034] Compared with the prior art, the double-source cascaded high and low temperature heat pump heating system has obvious advantages and application flexibility. The heating system of the embodiment can flexibly select to activate the first heat pump unit 1, the second heat pump unit 2, or simultaneously activate the two heat pump units to provide heating service for the user according to the actual demand of the user for the heating water temperature. This design gives the heating system high configurability and adaptability, and ensures efficient heating service in a wide range of temperature conditions and different application scenarios. The third pipe port 41 of the heating system is specially designed to allow the access of the recovered pipeline storing the waste heat source, so that the waste heat source that would otherwise be wasted can be reused as a heat source and efficiently utilized in the heating process. This design can improve the overall heating effect of the heating system, and promote the recycling of energy, reduce energy consumption and environmental pollution.

[0035] In summary, the double-source cascaded high and low temperature heat pump heating system not only flexibly meets the needs of users and has a wide range of applications, but also effectively utilizes waste heat sources, achieves the purpose of energy saving and environmental protection, and improves heating efficiency.

[0036] Specifically, referring to Figures 1 to 4As shown, the first port 31 is also selectively connected to the output of the second heat exchanger 12 or the output of the fourth heat exchanger 22 through the second control valve B.

[0037] Specifically, the input of the second heat exchanger 12 is selectively connected to the output of the third heat exchanger 21 or the second port 32 through the third control valve C.

[0038] Specifically, the fourth control valve D is further provided between the first control valve A and the input of the third heat exchanger 21, and the input of the third heat exchanger 21 is selectively connected to the first control valve A or the third port 41 through the fourth control valve D.

[0039] Specifically, the heating system further comprises a fourth port 42 for leading out the second medium after heat exchange, and the fifth control valve E is further provided between the third control valve C and the output of the third heat exchanger 21, and the output of the third heat exchanger 21 is selectively connected to the third control valve C or the fourth port 42 through the fifth control valve E.

[0040] Specifically, the second port 32 is selectively connected to the input of the second heat exchanger 12 and the input of the fourth heat exchanger 22 through the sixth control valve F.

[0041] In the embodiment, the first control valve A, the second control valve B, the third control valve C, the fourth control valve D, the fifth control valve E and the sixth control valve F are all three-way valves.

[0042] Specifically, referring to Figure 1 and Figure 2 As shown, the first water pump 51 is further provided between the input of the second heat exchanger 12 and the third control valve C. The first water pump 51 is used to accelerate the transportation of the heat transfer medium to be heated, and when the user needs low-temperature hot water or when the user needs high-temperature hot water and there is no available waste heat water source in the system, the first heat pump unit 1 is started, and the first water pump 51 is operated.

[0043] Specifically, referring to Figure 1 and Figure 3 As shown, in the embodiment, the second water pump 52 is further provided between the third port 41 and the fourth control valve D. The second water pump 52 is used to accelerate the transportation of the waste heat water source used as the second medium, and when there is an available waste heat water source in the heating system, the second heat pump unit 2 is started, and the second water pump 52 is operated.

[0044] Specifically, referring to Figure 1 , Figure 3 and Figure 4As shown, in the present embodiment, a buffer water tank 6 is further arranged between the fourth control valve D and the input end of the third heat exchanger 21. The buffer water tank 6 is used to increase the water capacity of the heating system, help stabilize the water temperature, reduce the frequent start-stop of the air source heat pump unit and the water source heat pump unit due to rapid changes in water temperature, at the same time, the buffer water tank 6 can also store heat and provide additional hot water supply during the peak demand period, help balance the circulating water volume.

[0045] Specifically, the first heat exchanger 11 is a fin heat exchanger, the second heat exchanger 12 is a low-temperature level water-side heat exchanger, the third heat exchanger 21 is a high-temperature level cold water-side heat exchanger, and the fourth heat exchanger 22 is a high-temperature level hot water-side heat exchanger.

[0046] Specifically, in the present embodiment, the first heat energy conversion unit further includes a four-way valve 13, an oil separator 14, an oil return capillary 15, an air source compressor 16, a heat exchange fan 17, a gas-liquid separator 18, a first expansion valve 191, a second expansion valve 192, a liquid cooling drive 101, and an economizer 102. Each port of the four-way valve 13 is connected with the first heat exchanger 11, the oil separator 14, the gas-liquid separator 18, and the second heat exchanger 12 respectively, the other end of the first heat exchanger 11 is connected with the liquid cooling drive 101 through the first expansion valve 191, the other end of the liquid cooling drive 101 is connected with the second heat exchanger 12, the end of the first heat exchanger 11 connected with the liquid cooling drive 101 is further connected with the economizer 102 through the first expansion valve 191 and the second expansion valve 192, the other end of the economizer 102 is connected with the air source compressor 16, the air source compressor 16 is connected with the oil separator 14, the oil return capillary 15, and the gas-liquid separator 18 respectively, and the oil separator 14 is further connected with the gas-liquid separator 18 through the oil return capillary 15.

[0047] Specifically, in the present embodiment, the second heat energy conversion unit includes a water source compressor 23 and a third expansion valve 24. The water source compressor 23 is arranged in the branch of the second heat pump unit 2 in which the refrigerant flows from the third heat exchanger 21 to the fourth heat exchanger 22, and the third expansion valve 24 is arranged in the branch of the second heat pump unit 2 in which the refrigerant flows from the fourth heat exchanger 22 to the third heat exchanger 21.

[0048] It should be noted that the working principle of the first heat pump unit 1 and the second heat pump unit 2 to achieve heating and the roles of each device and apparatus included in the first heat pump unit 1 and the second heat pump unit 2 in the present embodiment in the heating process are known to those skilled in the art, and will not be described in detail here.

[0049] It is apparent to a person skilled in the art that the present application is not restricted to the details of the foregoing exemplary embodiments, but that the present application can be implemented in other embodiments without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, the scope of the present application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims concerned.

[0050] Meanwhile, the above disclosure is only the preferred embodiment of the present application, and of course cannot limit the scope of the present application, so the equivalent changes made in the scope of the patent application of the present application still fall within the scope of the present application.

Claims

1. A dual-heat-source cascade high-low temperature heat pump heating system, characterized in that, Comprise: A first heat pump unit and a second heat pump unit, the first heat pump unit comprising a first heat exchanger and a second heat exchanger connected by a first heat energy conversion unit, the first heat exchanger being used for extracting low-grade heat energy in a first medium, and the second heat exchanger being used for outputting high-grade heat energy; The second heat pump unit comprises a third heat exchanger and a fourth heat exchanger connected by a second heat energy conversion unit, the third heat exchanger being used for extracting low-grade heat energy in a second medium, and the fourth heat exchanger being used for outputting high-grade heat energy; A first pipe for outputting heat transfer medium for heating users; The output end of the fourth heat exchanger is connected with the first pipe, and the output end of the second heat exchanger is selectively connected with the input end of the third heat exchanger or the first pipe through a first control valve; A second pipe connected with the input end of the second heat exchanger and the input end of the fourth heat exchanger, for providing heat transfer medium to be heated for the second heat exchanger and the fourth heat exchanger; A third pipe connected with the input end of the third heat exchanger, for providing the second medium meeting the requirement of heat source for the third heat exchanger.

2. The dual heat source cascaded high-low temperature heat pump heating system according to claim 1, characterized in that, The first pipe is also selectively connected with the output end of the second heat exchanger or the output end of the fourth heat exchanger through a second control valve.

3. The dual heat source cascaded high-low temperature heat pump heating system according to claim 1, characterized in that, The input end of the second heat exchanger is selectively connected with the output end of the third heat exchanger or the second pipe through a third control valve.

4. The dual heat source cascaded high-low temperature heat pump heating system according to claim 1, characterized in that, A fourth control valve is further arranged between the first control valve and the input end of the third heat exchanger, and the input end of the third heat exchanger is selectively connected with the first control valve or the third pipe through the fourth control valve.

5. The dual heat source cascaded high-low temperature heat pump heating system according to claim 3, characterized in that, A fourth pipe for leading out the second medium after heat exchange is further included, a fifth control valve is further arranged between the third control valve and the output end of the third heat exchanger, and the output end of the third heat exchanger is selectively connected with the third control valve or the fourth pipe through the fifth control valve.

6. The dual heat source cascaded high and low temperature heat pump heating system according to claim 1, characterized in that, The second pipe is selectively connected with the input end of the second heat exchanger and the input end of the fourth heat exchanger through a sixth control valve.

7. The dual heat source cascaded high-low temperature heat pump heating system according to claim 3, characterized in that, A first water pump is further arranged between the input end of the second heat exchanger and the third control valve.

8. The dual heat source cascaded high-low temperature heat pump heating system according to claim 4, characterized in that, A second water pump is further arranged between the third pipe and the fourth control valve.

9. The dual heat source cascaded high and low temperature heat pump heating system according to claim 4, characterized in that, A buffer water tank is further arranged between the fourth control valve and the input end of the third heat exchanger.

10. The dual heat source cascaded high and low temperature heat pump heating system according to claim 1, characterized in that, The first heat energy conversion unit comprises a four-way valve, an oil separator, an oil return capillary, an air source compressor, a heat exchange fan, a gas-liquid separator, a first expansion valve, a second expansion valve, a liquid cooling drive, and an economizer; and the second heat energy conversion unit comprises a water source compressor and a third expansion valve.

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