CN221146855U

CN221146855U - Lithium bromide heat pump and electric heating pump combined heating and cooling system

Info

Publication number: CN221146855U
Application number: CN202323127942.XU
Authority: CN
Inventors: 高小荣; 刘林; 孙彩霞; 任小庆; 苗瑞灿
Original assignee: Sinopec Green Energy Geothermal Development Co ltd
Current assignee: Sinopec Green Energy Geothermal Development Co ltd
Priority date: 2023-11-20
Filing date: 2023-11-20
Publication date: 2024-06-14
Anticipated expiration: 2033-11-20

Abstract

The utility model provides a lithium bromide heat pump and electric heat pump combined heating and cooling system. The lithium bromide heat pump and electric heat pump combined heating and cooling system comprises: the system comprises a geothermal water pumping and filling unit, a first plate heat exchange unit, a lithium bromide heat pump unit, a second plate heat exchange unit, a third heat exchange unit and a cooling unit. According to the utility model, the geothermal well water is used for driving the lithium bromide heat pump and is combined with the electric heat pump to realize the multi-stage utilization of the geothermal well water, the multi-stage utilization of the geothermal water is realized in winter according to the heat supply requirement of users, and the geothermal well water is used for driving the lithium bromide heat pump, so that the consumption of electric energy of the whole system is reduced, the energy is saved, and the environment is protected. In summer, the geothermal well water is used for driving the lithium bromide heat pump, and the lithium bromide heat pump is combined with the electric heat pump to cool a user. The utility model solves the problems of insufficient geothermal well water utilization, high recharging well water temperature and low geothermal utilization rate in the geothermal heating system in the prior art.

Description

Lithium bromide heat pump and electric heating pump combined heating and cooling system

Technical Field

The utility model relates to the technical field of geothermal resource development, in particular to a lithium bromide heat pump and electric heat pump combined heating and cooling system.

Background

The lithium bromide heat pump has the advantages of high efficiency, energy saving, environmental protection, safety, reliability and the like. Compared with the traditional air conditioning system, the lithium bromide heat pump has lower energy consumption and can save a large amount of energy. Meanwhile, as harmful substances such as Freon and the like are not needed, the pollution to the environment is smaller. In addition, open fire can not be generated in the operation process of the lithium bromide heat pump, so that the lithium bromide heat pump is safer and more reliable. At present, most commercial buildings or residential buildings supply heat (cool) by adopting geothermal well water and an electric heat pump or a gas heat pump, so that electric energy is consumed, a gas boiler can generate smoke to pollute the environment, and the problems of insufficient geothermal well water utilization, high recharging well water temperature, low geothermal utilization rate and the like exist in most geothermal heating systems. Meanwhile, in summer, the utilization efficiency of the geothermal well water and the electric heat pump or the gas heat pump for cooling is low.

Disclosure of utility model

The utility model mainly aims to provide a lithium bromide heat pump and electric heat pump combined heating and cooling system, which at least solves the problems of insufficient geothermal well water utilization, higher recharging well water temperature and low geothermal heat utilization rate in the geothermal heating system in the prior art.

In order to achieve the above object, the present utility model provides a lithium bromide heat pump and electric heat pump combined heating and cooling system, comprising: the system comprises a geothermal water pumping and filling unit, a first plate heat exchange unit, a lithium bromide heat pump unit, a second plate heat exchange unit, a third heat exchange unit and a cooling unit; the geothermal water pumping and filling unit is used for pumping geothermal well water from the geothermal well or discharging the geothermal tail water after heat exchange back to the geothermal well; the first plate heat exchange unit is connected with the geothermal water pumping and filling unit and the user side to receive part of geothermal well water extracted by the geothermal water pumping and filling unit, and is used for carrying out primary heat exchange on part of geothermal well water extracted by the geothermal water pumping and filling unit and user backwater of a first backwater pipeline at the user side so as to heat the user backwater of the first backwater pipeline and convey the user backwater to the first water supply pipeline at the user side; the lithium bromide heat pump unit is connected with the geothermal water pumping and filling unit and the user side to receive the other part of geothermal well water extracted by the geothermal water pumping and filling unit, and operates by utilizing the energy of the other part of geothermal well water to heat the user backwater of the second backwater pipeline and convey the user backwater to the second water supply pipeline at the user side; the second plate heat exchange unit is respectively connected with the first plate heat exchange unit and the lithium bromide heat pump unit, and is used for carrying out secondary heat exchange on geothermal well water subjected to heat exchange by the first plate heat exchange unit and user backwater of a third backwater pipeline at the user side so as to heat the user backwater of the third backwater pipeline and convey the user backwater to the third water supply pipeline at the user side; the geothermal well water subjected to heat exchange by the second plate heat exchange unit enters the lithium bromide heat pump unit and performs three-level heat exchange with the lithium bromide heat pump unit, and then is discharged back to the geothermal well through the geothermal water pumping and filling unit; the third heat exchange unit is connected with the lithium bromide heat pump unit, the geothermal well water pumping and filling unit and the user side, and is used for heating the geothermal well water utilized by the lithium bromide heat pump unit and the user backwater of the fourth backwater pipeline at the user side and conveying the user backwater to the fourth water supply pipeline at the user side; the geothermal well water subjected to heat exchange by the third heat exchange unit is discharged back to the geothermal well through the geothermal water pumping and filling unit; the cooling unit is connected with the lithium bromide heat pump unit and the third heat exchange unit and is used for providing circulating cold water for the lithium bromide heat pump unit and the third heat exchange unit; the lithium bromide heat pump unit is also used for exchanging heat of the user backwater of the fifth backwater pipeline at the user side so as to cool the user backwater of the fifth backwater pipeline and convey the cooled user backwater to the fifth water supply pipeline at the user side; the third heat exchange unit is also used for exchanging heat of the user backwater of the fifth backwater pipeline at the user side so as to cool the user backwater of the fifth backwater pipeline and convey the cooled user backwater to the sixth water supply pipeline at the user side.

Further, the first plate heat exchange unit comprises: the system comprises a first plate heat exchanger, a first geothermal water pipeline, a second geothermal water pipeline, a first water return pipeline and a first water supply pipeline; the first plate heat exchanger is provided with a first water inlet, a first water outlet, a second water inlet and a second water outlet; the water inlet end of the first geothermal water pipeline is connected with the geothermal water pumping and filling unit, the water outlet end of the first geothermal water pipeline is connected with the first water inlet, a first stop valve is arranged on the first geothermal water pipeline, and the first stop valve is used for controlling part of geothermal well water extracted by the geothermal water pumping and filling unit to enter the first plate heat exchanger through the first geothermal water pipeline for heat exchange; the water inlet end of the second geothermal water pipeline is connected with the first water outlet, the water outlet end of the second geothermal water pipeline is connected with the second plate heat exchange unit, and the second geothermal water pipeline is used for enabling geothermal well water subjected to heat exchange of the first plate heat exchanger to enter the second plate heat exchange unit; the water inlet end of the first water return pipeline is connected with a water return main pipe at the user side, the water outlet end of the first water return pipeline is connected with a second water inlet, a second stop valve is arranged on the first water return pipeline, and the second stop valve is used for controlling user water return to enter the first plate heat exchanger through the first water return pipeline for heating; the water outlet end of the first water supply pipeline is connected with a water supply main pipe at the user side, the water inlet end of the first water supply pipeline is connected with the second water outlet, a third stop valve is arranged on the first water supply pipeline and used for controlling the user backwater heated by the first plate heat exchanger to be conveyed to the user side through the first water supply pipeline.

Further, the lithium bromide heat pump unit includes: the lithium bromide heat pump, the third geothermal water pipeline, the fourth geothermal water pipeline, the second water return pipeline and the second water supply pipeline; the lithium bromide heat pump is provided with a generator, a condenser, an absorber and an evaporator, wherein the generator is provided with a third water inlet and a third water outlet, the evaporator is provided with a fourth water inlet and a fourth water outlet, the condenser is provided with a fifth water outlet, and the absorber is provided with a fifth water inlet; the water inlet end of the third geothermal water pipeline is connected with the geothermal water pumping and filling unit, the water outlet end of the third geothermal water pipeline is connected with the third water inlet, a fourth stop valve is arranged on the third geothermal water pipeline, and the fourth stop valve is used for controlling the other part of geothermal well water extracted by the geothermal water pumping and filling unit to enter the generator through the third geothermal water pipeline for heat exchange; the water inlet end of the fourth geothermal water pipeline is connected with the third water outlet, the water outlet end of the fourth geothermal water pipeline is connected with the third heat exchange unit, a fifth stop valve is arranged on the fourth geothermal water pipeline, and the fifth stop valve is used for controlling geothermal well water subjected to heat exchange by the generator to enter the third heat exchange unit through the fourth geothermal water pipeline; the water inlet end of the second water return pipeline is connected with a water return main pipe at the user side, the water outlet end of the second water return pipeline is connected with a fifth water inlet, and the second water return pipeline is used for enabling user water return to enter the lithium bromide heat pump through the first water return pipeline for heating; the water inlet end of the second water supply pipeline is connected with the fifth water outlet, the water outlet end of the second water supply pipeline is connected with a water supply main pipe at the user side, a sixth stop valve is arranged on the second water supply pipeline and used for controlling user backwater heated by the lithium bromide heat pump to be conveyed to the user side through the second water supply pipeline.

Further, the second plate heat exchange unit comprises: a second plate heat exchanger, a fifth geothermal water pipe, a sixth geothermal water pipe, a third return pipe and a third water supply pipe; the second plate heat exchanger is provided with a sixth water inlet, a sixth water outlet, a seventh water inlet and a seventh water outlet; the sixth water inlet is connected with the first water outlet through a second geothermal water pipeline, and the second geothermal water pipeline is used for enabling geothermal well water subjected to heat exchange of the first plate heat exchanger to enter the second plate heat exchanger for heat exchange; the water inlet end of the fifth geothermal water pipeline is connected with the sixth water outlet, the water outlet end of the fifth geothermal water pipeline is connected with the fourth water inlet, a seventh stop valve is arranged on the fifth geothermal water pipeline, and the seventh stop valve is used for controlling geothermal well water after heat exchange of the second plate heat exchanger to enter the evaporator for heat exchange; the water inlet end of the sixth geothermal water pipeline is connected with the fourth water outlet, the water outlet end of the sixth geothermal water pipeline is connected with the geothermal water pumping and filling unit, an eighth stop valve is arranged on the sixth geothermal water pipeline, and the eighth stop valve is used for controlling geothermal well water after heat exchange of the evaporator to be discharged back to the geothermal well through the geothermal water pumping and filling unit; the water inlet end of the third water return pipeline is connected with a water return main pipe at the user side, the water outlet end of the third water return pipeline is connected with a seventh water inlet, a ninth stop valve is arranged on the third water return pipeline, and the ninth stop valve is used for controlling user water return to enter the second plate heat exchanger through the third water return pipeline for heating; the water outlet end of the third water supply pipeline is connected with a water supply main pipe at the user side, the water inlet end of the third water supply pipeline is connected with a seventh water outlet, a tenth stop valve is arranged on the third water supply pipeline and used for controlling the user backwater heated by the second plate heat exchanger to be conveyed to the user side through the third water supply pipeline.

Further, the third heat exchange unit includes: the system comprises a third plate heat exchanger, an electric heat pump, a seventh geothermal water pipeline, a first circulating pipeline, a second circulating pipeline, a fourth water return pipeline and a fourth water supply pipeline; the third plate heat exchanger is provided with an eighth water inlet, an eighth water outlet, a ninth water inlet and a ninth water outlet; the third water outlet and the eighth water inlet are connected through a fourth geothermal water pipeline, and the fourth geothermal water pipeline is used for enabling geothermal well water subjected to heat exchange by the generator to enter the third heat exchange unit for heat exchange; the electric heat pump is provided with a tenth water inlet, a tenth water outlet, an eleventh water inlet and an eleventh water outlet; the water inlet end of the seventh geothermal water pipeline is connected with the eighth water outlet, the water outlet end of the seventh geothermal water pipeline is connected with the geothermal water pumping and filling unit, and the seventh geothermal water pipeline is used for enabling geothermal well water subjected to heat exchange of the third plate heat exchanger to be discharged back to the geothermal well through the geothermal water pumping and filling unit; the water inlet end of the first circulating pipeline is connected with the tenth water outlet, the water outlet end of the first circulating pipeline is connected with the ninth water inlet, an eleventh stop valve is arranged on the first circulating pipeline, and the eleventh stop valve is used for controlling the refrigerant in the electric heat pump to enter the third plate heat exchanger for heat exchange; the water inlet end of the second circulating pipeline is connected with the ninth water outlet, the water outlet end of the second circulating pipeline is connected with the tenth water inlet, and a twelfth stop valve is arranged on the second circulating pipeline and is used for controlling the heated refrigerant to enter the electric heat pump; the water inlet end of the fourth water return pipeline is connected with a water return main pipe at the user side, the water outlet end of the fourth water return pipeline is connected with an eleventh water inlet, and a thirteenth stop valve is arranged on the fourth water return pipeline and is used for controlling user water return to enter the electric heat pump for heating through the fourth water return pipeline; the water outlet end of the fourth water supply pipeline is connected with a water return header pipe at the user side, the water inlet end of the fourth water supply pipeline is connected with an eleventh water outlet, a fourteenth stop valve is arranged on the fourth water supply pipeline and used for controlling the user backwater heated by the electric heating pump to be conveyed to the user side through the fourth water supply pipeline.

Further, the cooling unit includes: a cooling tower, a first cooling water pipe and a second cooling water pipe; the cooling tower is provided with a twelfth water inlet and a twelfth water outlet; the water inlet of the first cooling water pipeline is connected with the twelfth water outlet, the water outlet of the first cooling water pipeline is connected with the lithium bromide heat pump unit and the third heat exchange unit, a fifteenth stop valve is arranged on the first cooling water pipeline, and the fifteenth stop valve is used for controlling cooling water of the cooling tower to enter the lithium bromide heat pump unit and the third heat exchange unit for heat exchange through the first cooling water pipeline; the water outlet of the second cooling water pipeline is connected with the twelfth water inlet, the water inlet of the second cooling water pipeline is connected with the lithium bromide heat pump unit and the third heat exchange unit, a sixteenth stop valve is arranged on the second cooling water pipeline and used for controlling cooling water after heat exchange of the lithium bromide heat pump unit and the third heat exchange unit to enter the cooling tower for cooling so as to recycle.

Further, the lithium bromide heat pump unit further comprises: a fifth water return pipe, a fifth water supply pipe, and an eighth geothermal water pipe; the water inlet end of the fifth water return pipeline is connected with the water return main pipe at the user side, the water outlet end of the fifth water return pipeline is connected with the fourth water inlet, a seventeenth stop valve is arranged on the fifth water return pipeline and used for controlling user water return at the user side to enter the evaporator for cooling through the fifth water return pipeline; the water inlet end of the fifth water supply pipeline is connected with the fourth water outlet, the water outlet end of the fifth water supply pipeline is connected with a water supply main pipe at the user side, an eighteenth stop valve is arranged on the fifth water supply pipeline, and the eighteenth stop valve is used for controlling user backwater cooled by the evaporator to be conveyed to the user side through the fifth water supply pipeline; the water inlet end of the eighth geothermal water pipeline is connected with the third water outlet, the water outlet end of the eighth geothermal water pipeline is connected with the geothermal water pumping and filling unit, a twenty-second stop valve is arranged on the eighth geothermal water pipeline, and the twenty-second stop valve is used for controlling geothermal well water subjected to heat exchange by the generator to enter the geothermal water pumping and filling unit through the eighth geothermal water pipeline so as to be discharged back to the geothermal well; the second water return pipeline is connected with the first cooling water pipeline and is also used for conveying cooling water of the first cooling water pipeline into the lithium bromide heat pump through the fifth water inlet for heat exchange; the second water supply pipeline is connected with the second cooling water pipeline, and the second water supply pipeline is also used for conveying cooling water subjected to heat exchange of the lithium bromide heat pump into the second cooling water pipeline through the fifth water outlet.

Further, the third heat exchange unit further includes: a third cooling water pipe, a fourth cooling water pipe, and a sixth water supply pipe; the water inlet end of the third cooling water pipeline is connected with the water outlet end of the first cooling water pipeline, the water outlet end of the third cooling water pipeline is connected with the eleventh water inlet, and the nineteenth stop valve is arranged on the third cooling water pipeline and is used for controlling cooling water of the first cooling water pipeline to enter the electric heat pump for heat exchange through the third cooling water pipeline; the water inlet end of the fourth cooling water pipeline is connected with the eleventh water outlet, the water outlet end of the fourth cooling water pipeline is connected with the water inlet end of the second cooling water pipeline, a twentieth stop valve is arranged on the fourth cooling water pipeline, and the twentieth stop valve is used for controlling cooling water subjected to heat exchange of the electric heating pump to enter the second cooling water pipeline through the fourth cooling water pipeline; the water inlet end of the sixth water supply pipeline is connected with the tenth water outlet, the water outlet end of the sixth water supply pipeline is connected with a water supply main pipe at the user side, a twenty-first stop valve is arranged on the sixth water supply pipeline, and the twenty-first stop valve is used for controlling user backwater cooled by the electric heating pump to be conveyed to the user side through the sixth water supply pipeline; the other water outlet end of the fifth water return pipeline is connected with the tenth water inlet, and the other part of user backwater at the user side enters the electric heat pump through the fifth water return pipeline to cool.

Further, the geothermal water pumping and irrigating unit further comprises: cyclone desander and recharging filter; the cyclone sand remover is connected with the geothermal well, the first plate heat exchange unit and the lithium bromide heat pump unit, and is used for filtering impurities in geothermal well water extracted by the geothermal water pumping and filling unit and conveying the filtered geothermal well water to the first plate heat exchange unit and the lithium bromide heat pump unit; the recharging filter is connected with the third heat exchange unit, the lithium bromide heat pump unit and the geothermal well, and is used for removing impurity particles in geothermal tail water and recharging the impurity particles into the geothermal well.

According to the utility model, the geothermal well water is used for driving the lithium bromide heat pump and is combined with the electric heat pump to realize the multi-stage utilization of the geothermal well water, the multi-stage utilization of the geothermal water is realized in winter according to the heat supply requirement of users, and the geothermal well water is used for driving the lithium bromide heat pump, so that the consumption of electric energy of the whole system is reduced, the energy is saved, and the environment is protected. In summer, the geothermal well water is used for driving the lithium bromide heat pump, and the lithium bromide heat pump is combined with the electric heat pump to cool a user. The utility model solves the problems of insufficient geothermal well water utilization, high recharging well water temperature and low geothermal utilization rate in the geothermal heating system in the prior art.

The beneficial effects of the utility model are as follows:

1. The whole system utilizes geothermal well water in multiple stages, so that the purposes of high geothermal water utilization rate and full utilization of geothermal energy are achieved.

2. The whole system combines the lithium bromide heat pump and the electric heat pump to supply heat, the lithium bromide heat pump is driven by geothermal water, the whole process uses clean energy, no harmful gas is generated, the environment is protected, and the environment-friendly low-carbon development is met.

3. The whole system can supply heat in winter and cool in summer, so that double supply of the system is realized.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

fig. 1 is a schematic diagram of a combined heating and cooling system of a lithium bromide heat pump and an electric heat pump according to an alternative embodiment of the utility model;

Fig. 2 is a schematic diagram showing details of a structure of an alternative heating and cooling system combining a lithium bromide heat pump and an electric heat pump according to an embodiment of the present utility model.

Wherein the above figures include the following reference numerals:

10. A geothermal water pumping and filling unit; 11. a cyclone desander; 12. recharging the filter; 20. a first plate heat exchange unit; 21. a first plate heat exchanger; 211. a first water inlet; 212. a first water outlet; 213. a second water inlet; 214. a second water outlet; 22. a first geothermal water pipe; 23. a second geothermal water pipe; 24. a first return line; 25. a first water supply pipe; 30. a lithium bromide heat pump unit; 31. a lithium bromide heat pump; 311. a generator; 3111. a third water inlet; 3112. a third water outlet; 312. a condenser; 3121. a fifth water outlet; 313. an absorber; 3131. a fifth water inlet; 314. an evaporator; 3141. a fourth water inlet; 3142. a fourth water outlet; 32. a third geothermal water pipe; 33. a fourth geothermal water pipe; 34. a second water return line; 35. a second water supply pipe; 301. a fifth water return pipe; 302. a fifth water supply pipe; 303. eighth geothermal water pipe; 40. a second plate heat exchange unit; 41. a second plate heat exchanger; 42. a fifth geothermal water pipe; 43. a sixth geothermal water pipe; 44. a third water return line; 45. a third water supply pipe; 50. a third heat exchange unit; 51. a third plate heat exchanger; 511. an eighth water inlet; 512. an eighth water outlet; 513. a ninth water inlet; 514. a ninth water outlet; 52. an electric heat pump; 53. seventh geothermal water pipe; 54. a first circulation pipe; 55. a second circulation pipe; 56. a fourth water return line; 57. a fourth water supply pipe; 501. a third cooling water pipe; 502. a fourth cooling water pipe; 503. a sixth water supply pipe; 60. a geothermal well; 70. a user side; 80. a water return main pipe; 90. a water supply main pipe; 100. a cooling unit; 101. a cooling tower; 1011. twelve water inlets; 1012. a twelfth water outlet; 102. a first cooling water pipe; 103. a second cooling water pipe; 110. a first stop valve; 111. a second shut-off valve; 112. a third stop valve; 113. a fourth shut-off valve; 114. a fifth shut-off valve; 115. a sixth shut-off valve; 116. a seventh stop valve; 117. an eighth shutoff valve; 118. a ninth shut-off valve; 119. a tenth shut-off valve; 120. an eleventh stop valve; 121. a twelfth stop valve; 122. a thirteenth shut-off valve; 123. a fourteenth stop valve; 124. a fifteenth shut-off valve; 125. a sixteenth stop valve; 126. seventeenth stop valve; 127. an eighteenth stop valve; 128. a nineteenth stop valve; 129. a twentieth shut-off valve; 130. a twenty-first shut-off valve; 131. and a twenty-second shut-off valve.

Detailed Description

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.

As shown in fig. 1, a lithium bromide heat pump and electric heat pump combined heating and cooling system comprises: the system comprises a geothermal water pumping and filling unit 10, a first plate heat exchange unit 20, a lithium bromide heat pump unit 30, a second plate heat exchange unit 40, a third heat exchange unit 50 and a cooling unit 100; the geothermal water pumping and filling unit 10 is used for pumping geothermal well water from the geothermal well 60 or discharging geothermal tail water after heat exchange back to the geothermal well 60; the first plate heat exchange unit 20 is connected with the geothermal water pumping and filling unit 10 and the user side 70 to receive the part of geothermal well water pumped by the geothermal water pumping and filling unit 10, and the first plate heat exchange unit 20 is used for performing primary heat exchange between the part of geothermal well water pumped by the geothermal water pumping and filling unit 10 and the user backwater of the first backwater pipeline 24 of the user side 70 to heat the user backwater of the first backwater pipeline 24 and convey the user backwater to the first water supply pipeline 25 of the user side 70; the lithium bromide heat pump unit 30 is connected with the geothermal water pumping unit 10 and the user side 70 to receive another part of geothermal well water extracted by the geothermal water pumping unit 10, and the lithium bromide heat pump unit 30 is operated by using energy of the another part of geothermal well water to heat the user backwater of the second backwater pipe 34 and to convey the user backwater to the second water supply pipe 35 of the user side 70; the second plate heat exchange unit 40 is respectively connected with the first plate heat exchange unit 20 and the lithium bromide heat pump unit 30, and the second plate heat exchange unit 40 is used for performing secondary heat exchange on geothermal well water after heat exchange of the first plate heat exchange unit 20 and user backwater of the third backwater pipeline 44 of the user side 70 so as to heat the user backwater of the third backwater pipeline 44 and convey the user backwater to the third water supply pipeline 45 of the user side 70; the geothermal well water subjected to heat exchange by the second plate heat exchange unit 40 enters the lithium bromide heat pump unit 30 to perform three-level heat exchange with the lithium bromide heat pump unit 30, and then is discharged back to the geothermal well 60 through the geothermal water pumping and filling unit 10; the third heat exchange unit 50 is connected to the lithium bromide heat pump unit 30, the geothermal water pumping and irrigating unit 10 and the user side 70, and the third heat exchange unit 50 is configured to heat the geothermal well water after the lithium bromide heat pump unit 30 is utilized and the user backwater of the fourth backwater pipeline 56 of the user side 70 and convey the user backwater to the fourth water supply pipeline 57 of the user side 70; wherein, the geothermal well water after heat exchange by the third heat exchange unit 50 is discharged back to the geothermal well 60 through the geothermal water pumping and filling unit 10; the cooling unit 100 is connected to both the lithium bromide heat pump unit 30 and the third heat exchange unit 50, and the cooling unit 100 is used for providing circulating cold water to the lithium bromide heat pump unit 30 and the third heat exchange unit 50; the lithium bromide heat pump unit 30 is further configured to exchange heat with the user backwater of the fifth backwater pipeline 301 of the user side 70 to cool the user backwater of the fifth backwater pipeline 301 and convey the cooled user backwater to the fifth water supply pipeline 302 of the user side 70; the third heat exchange unit 50 is further configured to exchange heat with the user return water of the fifth return water pipe 301 of the user side 70 to cool down the user return water of the fifth return water pipe 301 and convey the cooled user return water to the sixth water supply pipe 503 of the user side 70.

The specific implementation method of the system provided by the utility model comprises the following steps: in winter, geothermal well water is pumped from the geothermal well 60 by the geothermal water pumping-filling unit 10, and part of geothermal well water is transported into the first plate heat exchange unit 20 to perform primary heat exchange on the user backwater of the first backwater pipe 24 of the user side 70 to heat the user backwater of the first backwater pipe 24 and convey the user backwater to the first water supply pipe 25 of the user side 70; transporting geothermal well water after heat exchange of the first plate heat exchange unit 20 into the second plate heat exchange unit 40 to perform secondary heat exchange on the user backwater of the third backwater pipeline 44 of the user side 70 so as to heat the user backwater of the third backwater pipeline 44 and convey the user backwater to the third water supply pipeline 45 of the user side 70; the geothermal well water subjected to heat exchange by the second plate heat exchange unit 40 enters the lithium bromide heat pump unit 30 to perform three-level heat exchange with the lithium bromide heat pump unit 30, and then is discharged back to the geothermal well 60 through the geothermal water pumping and filling unit 10; transporting another portion of the geothermal well water into the lithium bromide heat pump unit 30, operating the lithium bromide heat pump unit 30 using energy of the another portion of the geothermal well water to heat the user return water of the second return water pipe 34 and to transport the user return water to the second water supply pipe 35 of the user side 70; transporting the geothermal well water, which has been utilized by the lithium bromide heat pump unit 30, into the third heat exchange unit 50 to heat the user return water of the fourth return water pipe 56 of the user side 70 and to transport the user return water to the fourth water supply pipe 57 of the user side 70; the geothermal well water subjected to heat exchange by the third heat exchange unit 50 is discharged back to the geothermal well 60 through the geothermal water pumping and irrigating unit 10; in summer, the cooling water of the cooling unit 100 is transported into the lithium bromide heat pump unit 30 while the geothermal well water is extracted from the geothermal well 60 by the geothermal water pumping unit 10, and all the geothermal well water is transported into the lithium bromide heat pump unit 30 to operate the lithium bromide heat pump unit 30; a fifth water supply pipe 302 for operating the lithium bromide heat pump unit 30 with geothermal well water and cooling water to cool down part of the user backwater of the fifth water return pipe 301 and to deliver the user backwater to the user side 70; the geothermal well water after the lithium bromide heat pump unit 30 is utilized is discharged back to the geothermal well 60 through the geothermal water pumping and filling unit 10; transporting the cooling water of the cooling unit 100 into the third heat exchange unit 50 to cool down another portion of the user return water of the fifth return water pipe 301 of the user side 70 and to transport the user return water to the sixth water supply pipe 503 of the user side 70; the cooling water after heat exchange of the lithium bromide heat pump unit 30 and the third heat exchange unit 50 is transported to the cooling unit 100 to be cooled down for recycling.

The whole system of the utility model utilizes geothermal well water in multiple stages, thereby achieving the purposes of high geothermal water utilization rate and full utilization of geothermal energy. The whole system combines the lithium bromide heat pump and the electric heat pump to supply heat, the lithium bromide heat pump is driven by geothermal water, the whole process uses clean energy, no harmful gas is generated, the environment is protected, and the environment-friendly low-carbon development is met. The whole system can supply heat in winter and cool in summer, so that double supply of the system is realized.

As an optimization of the present utility model, as shown in fig. 2, the first plate heat exchange unit 20 includes: a first plate heat exchanger 21, a first geothermal water pipe 22, a second geothermal water pipe 23, a first return 24, and a first water supply pipe 25; the first plate heat exchanger 21 is provided with a first water inlet 211, a first water outlet 212, a second water inlet 213 and a second water outlet 214; the water inlet end of the first geothermal water pipeline 22 is connected with the geothermal water pumping and filling unit 10, the water outlet end of the first geothermal water pipeline 22 is connected with the first water inlet 211, the first geothermal water pipeline 22 is provided with a first stop valve 110, and the first stop valve 110 is used for controlling part of geothermal well water pumped by the geothermal water pumping and filling unit 10 to enter the first plate heat exchanger 21 through the first geothermal water pipeline 22 for heat exchange; the water inlet end of the second geothermal water pipeline 23 is connected with the first water outlet 212, the water outlet end of the second geothermal water pipeline 23 is connected with the second plate heat exchange unit 40, and the second geothermal water pipeline 23 is used for enabling geothermal well water subjected to heat exchange of the first plate heat exchanger 21 to enter the second plate heat exchange unit 40; the water inlet end of the first water return pipeline 24 is connected with the water return main pipe 80 of the user side 70, the water outlet end of the first water return pipeline 24 is connected with the second water inlet 213, the first water return pipeline 24 is provided with a second stop valve 111, and the second stop valve 111 is used for controlling water returned by the user to enter the first plate heat exchanger 21 through the first water return pipeline 24 for heating; the water outlet end of the first water supply pipeline 25 is connected with the water supply main 90 of the user side 70, the water inlet end of the first water supply pipeline 25 is connected with the second water outlet 214, a third stop valve 112 is arranged on the first water supply pipeline 25, and the third stop valve 112 is used for controlling the user backwater heated by the first plate heat exchanger 21 to be conveyed to the user side 70 through the first water supply pipeline 25.

As an optimization of the present utility model, as shown in fig. 2, the lithium bromide heat pump unit 30 includes: a lithium bromide heat pump 31, a third geothermal water pipe 32, a fourth geothermal water pipe 33, a second return 34, and a second water supply pipe 35; the lithium bromide heat pump 31 has a generator 311, a condenser 312, an absorber 313, and an evaporator 314, the generator 311 having a third water inlet 3111 and a third water outlet 3112, the evaporator 314 having a fourth water inlet 3141 and a fourth water outlet 3142, the condenser 312 having a fifth water outlet 3121, the absorber 313 having a fifth water inlet 3131; the water inlet end of the third geothermal water pipeline 32 is connected with the geothermal water pumping and filling unit 10, the water outlet end of the third geothermal water pipeline 32 is connected with the third water inlet 3111, a fourth stop valve 113 is arranged on the third geothermal water pipeline 32, and the fourth stop valve 113 is used for controlling the other part of geothermal well water pumped by the geothermal water pumping and filling unit 10 to enter the generator 311 for heat exchange through the third geothermal water pipeline 32; the water inlet end of the fourth geothermal water pipeline 33 is connected with the third water outlet 3112, the water outlet end of the fourth geothermal water pipeline 33 is connected with the third heat exchange unit 50, a fifth stop valve 114 is arranged on the fourth geothermal water pipeline 33, and the fifth stop valve 114 is used for controlling geothermal well water after heat exchange of the generator 311 to enter the third heat exchange unit 50 through the fourth geothermal water pipeline 33; the water inlet end of the second water return pipeline 34 is connected with the water return main pipe 80 of the user side 70, the water outlet end of the second water return pipeline 34 is connected with the fifth water inlet 3131, and the second water return pipeline 34 is used for enabling user water return to enter the lithium bromide heat pump 31 through the first water return pipeline 24 for heating; the water inlet end of the second water supply pipeline 35 is connected to the fifth water outlet 3121, the water outlet end of the second water supply pipeline 35 is connected to the water supply main 90 of the user side 70, a sixth stop valve 115 is provided on the second water supply pipeline 35, and the sixth stop valve 115 is used for controlling the user backwater heated by the lithium bromide heat pump 31 to be delivered to the user side 70 through the second water supply pipeline 35.

As an optimization of the present utility model, as shown in fig. 2, the second plate heat exchange unit 40 includes: a second plate heat exchanger 41, a fifth geothermal water pipe 42, a sixth geothermal water pipe 43, a third return 44 and a third water supply pipe 45; the second plate heat exchanger 41 is provided with a sixth water inlet 411, a sixth water outlet 412, a seventh water inlet 413 and a seventh water outlet 414; the sixth water inlet 411 is connected with the first water outlet 212 through a second geothermal water pipeline 23, and the second geothermal water pipeline 23 is used for enabling geothermal well water subjected to heat exchange of the first plate heat exchanger 21 to enter the second plate heat exchanger 41 for heat exchange; the water inlet end of the fifth geothermal water pipeline 42 is connected with the sixth water outlet 412, the water outlet end of the fifth geothermal water pipeline 42 is connected with the fourth water inlet 3141, a seventh stop valve 116 is arranged on the fifth geothermal water pipeline 42, and the seventh stop valve 116 is used for controlling geothermal well water after heat exchange of the second plate heat exchanger 41 to enter the evaporator 314 for heat exchange; the water inlet end of the sixth geothermal water pipeline 43 is connected with the fourth water outlet 3142, the water outlet end of the sixth geothermal water pipeline 43 is connected with the geothermal water pumping and filling unit 10, an eighth stop valve 117 is arranged on the sixth geothermal water pipeline 43, and the eighth stop valve 117 is used for controlling geothermal well water after heat exchange of the evaporator 314 to be discharged back to the geothermal well 60 through the geothermal water pumping and filling unit 10; the water inlet end of the third water return pipeline 44 is connected with the water return main pipe 80 of the user side 70, the water outlet end of the third water return pipeline 44 is connected with the seventh water inlet 413, a ninth stop valve 118 is arranged on the third water return pipeline 44, and the ninth stop valve 118 is used for controlling the user water return to enter the second plate heat exchanger 41 for heating through the third water return pipeline 44; the water outlet end of the third water supply pipeline 45 is connected with the water supply main 90 of the user side 70, the water inlet end of the third water supply pipeline 45 is connected with the seventh water outlet 414, a tenth stop valve 119 is arranged on the third water supply pipeline 45, and the tenth stop valve 119 is used for controlling the user backwater heated by the second plate heat exchanger 41 to be conveyed to the user side 70 through the third water supply pipeline 45.

As an optimization scheme of the present utility model, as shown in fig. 2, the third heat exchange unit 50 includes: a third plate heat exchanger 51, an electric heat pump 52, a seventh geothermal water pipe 53, a first circulation pipe 54, a second circulation pipe 55, a fourth return pipe 56, and a fourth water supply pipe 57; the third plate heat exchanger 51 is provided with an eighth water inlet 511, an eighth water outlet 512, a ninth water inlet 513 and a ninth water outlet 514; the third water outlet 3112 is connected to the eighth water inlet 511 through a fourth geothermal water pipeline 33, and the fourth geothermal water pipeline 33 is used for enabling geothermal well water after heat exchange of the generator 311 to enter the third heat exchange unit 50 for heat exchange; the electric heat pump 52 is provided with a tenth water inlet 521, a tenth water outlet 522, an eleventh water inlet 523 and an eleventh water outlet 524; the water inlet end of the seventh geothermal water pipeline 53 is connected with the eighth water outlet 512, the water outlet end of the seventh geothermal water pipeline 53 is connected with the geothermal water pumping and filling unit 10, and the seventh geothermal water pipeline 53 is used for discharging geothermal well water after heat exchange of the third plate heat exchanger 51 back to the geothermal well 60 through the geothermal water pumping and filling unit 10; the water inlet end of the first circulation pipeline 54 is connected with the tenth water outlet 522, the water outlet end of the first circulation pipeline 54 is connected with the ninth water inlet 513, an eleventh stop valve 120 is arranged on the first circulation pipeline 54, and the eleventh stop valve 120 is used for controlling the refrigerant in the electric heat pump 52 to enter the third plate heat exchanger 51 for heat exchange; the water inlet end of the second circulation pipeline 55 is connected with the ninth water outlet 514, the water outlet end of the second circulation pipeline 55 is connected with the tenth water inlet 521, a twelfth stop valve 121 is arranged on the second circulation pipeline 55, and the twelfth stop valve 121 is used for controlling the heated refrigerant to enter the electric heat pump 52; the water inlet end of the fourth water return pipeline 56 is connected with the water return main pipe 80 of the user side 70, the water outlet end of the fourth water return pipeline 56 is connected with the eleventh water inlet 523, a thirteenth stop valve 122 is arranged on the fourth water return pipeline 56, and the thirteenth stop valve 122 is used for controlling the user water return to enter the electric heat pump 52 through the fourth water return pipeline 56 for heating; the water outlet end of the fourth water supply pipe 57 is connected to the water return header pipe 80 of the user side 70, the water inlet end of the fourth water supply pipe 57 is connected to the eleventh water outlet 524, a fourteenth stop valve 123 is provided on the fourth water supply pipe 57, and the fourteenth stop valve 123 is used for controlling the user water heated by the electric heat pump 52 to be delivered to the user side 70 through the fourth water supply pipe 57.

As an optimization of the present utility model, as shown in fig. 2, the cooling unit 100 includes: a cooling tower 101, a first cooling water pipe 102, and a second cooling water pipe 103; the cooling tower 101 has a twelfth water inlet 1011 and a twelfth water outlet 1012; the water inlet of the first cooling water pipeline 102 is connected with the twelfth water outlet 1012, the water outlet of the first cooling water pipeline 102 is connected with the lithium bromide heat pump unit 30 and the third heat exchange unit 50, a fifteenth stop valve 124 is arranged on the first cooling water pipeline 102, and the fifteenth stop valve 124 is used for controlling cooling water of the cooling tower 101 to enter the lithium bromide heat pump unit 30 and the third heat exchange unit 50 for heat exchange through the first cooling water pipeline 102; the water outlet of the second cooling water pipeline 103 is connected with the twelfth water inlet 1011, the water inlet of the second cooling water pipeline 103 is connected with the lithium bromide heat pump unit 30 and the third heat exchange unit 50, the sixteenth stop valve 125 is arranged on the second cooling water pipeline 103, and the sixteenth stop valve 125 is used for controlling the cooling water after heat exchange of the lithium bromide heat pump unit 30 and the third heat exchange unit 50 to enter the cooling tower 101 for cooling so as to recycle.

As an optimization scheme of the present utility model, as shown in fig. 2, the lithium bromide heat pump unit 30 further includes: a fifth return water pipe 301, a fifth water supply pipe 302, and an eighth geothermal water pipe 303; the water inlet end of the fifth water return pipeline 301 is connected with the water return main pipe 80 of the user side 70, the water outlet end of the fifth water return pipeline 301 is connected with the fourth water inlet 3141, a seventeenth stop valve 126 is arranged on the fifth water return pipeline 301, and the seventeenth stop valve 126 is used for controlling the user water return of the user side 70 to enter the evaporator 314 for cooling through the fifth water return pipeline 301; the water inlet end of the fifth water supply pipeline 302 is connected with the fourth water outlet 3142, the water outlet end of the fifth water supply pipeline 302 is connected with the water supply main 90 of the user side 70, an eighteenth stop valve 127 is arranged on the fifth water supply pipeline 302, and the eighteenth stop valve 127 is used for controlling the user backwater cooled by the evaporator 314 to be conveyed to the user side 70 through the fifth water supply pipeline 302; the water inlet end of the eighth geothermal water pipeline 303 is connected with the third water outlet 3112, the water outlet end of the eighth geothermal water pipeline 303 is connected with the geothermal water pumping and filling unit 10, a twenty-second stop valve 131 is arranged on the eighth geothermal water pipeline 303, and the twenty-second stop valve 131 is used for controlling geothermal well water subjected to heat exchange by the generator 311 to enter the geothermal water pumping and filling unit 10 through the eighth geothermal water pipeline 303 so as to be discharged back to the geothermal well 60; the second water return pipeline 34 is connected with the first cooling water pipeline 102, and the second water return pipeline 34 is further used for conveying cooling water of the first cooling water pipeline 102 into the lithium bromide heat pump 31 through the fifth water inlet 3131 for heat exchange; the second water supply pipe 35 is connected to the second cooling water pipe 103, and the second water supply pipe 35 is further configured to transport the cooling water after heat exchange of the lithium bromide heat pump 31 into the second cooling water pipe 103 through the fifth water outlet 3121.

As an optimization scheme of the present utility model, as shown in fig. 2, the third heat exchange unit 50 further includes: a third cooling water pipe 501, a fourth cooling water pipe 502, and a sixth water supply pipe 503; the water inlet end of the third cooling water pipeline 501 is connected with the water outlet end of the first cooling water pipeline 102, the water outlet end of the third cooling water pipeline 501 is connected with the eleventh water inlet 523, the nineteenth stop valve 128 is arranged on the third cooling water pipeline 501, and the nineteenth stop valve 128 is used for controlling the cooling water of the first cooling water pipeline 102 to enter the electric heat pump 52 for heat exchange through the third cooling water pipeline 501; the water inlet end of the fourth cooling water pipeline 502 is connected with the eleventh water outlet 524, the water outlet end of the fourth cooling water pipeline 502 is connected with the water inlet end of the second cooling water pipeline 103, the fourth cooling water pipeline 502 is provided with a twentieth stop valve 129, and the twentieth stop valve 129 is used for controlling cooling water subjected to heat exchange of the electric heat pump 52 to enter the second cooling water pipeline 103 through the fourth cooling water pipeline 502; the water inlet end of the sixth water supply pipeline 503 is connected with the tenth water outlet 522, the water outlet end of the sixth water supply pipeline 503 is connected with the water supply main 90 of the user side 70, the twenty-first stop valve 130 is arranged on the sixth water supply pipeline 503, and the twenty-first stop valve 130 is used for controlling the user backwater cooled by the electric heat pump 52 to be delivered to the user side 70 through the sixth water supply pipeline 503; the other water outlet end of the fifth water return pipeline 301 is connected to the tenth water inlet 521, and the other part of the user backwater on the user side 70 enters the electric heat pump 52 through the fifth water return pipeline 301 to cool.

As an optimization scheme of the present utility model, as shown in fig. 2, the geothermal water pumping and filling unit 10 further includes: a cyclone sand remover 11 and a recharge filter 12; the cyclone sand remover 11 is connected with the geothermal well 60, the first plate heat exchange unit 20 and the lithium bromide heat pump unit 30, and the cyclone sand remover 11 is used for filtering impurities in geothermal well water extracted by the geothermal water pumping and filling unit 10 and conveying the filtered geothermal well water to the first plate heat exchange unit 20 and the lithium bromide heat pump unit 30; the recharging filter 12 is connected to the third heat exchange unit 50, the lithium bromide heat pump unit 30 and the geothermal well 60, and the recharging filter 12 is used for removing impurity particles in the geothermal tail water and recharging the impurity particles into the geothermal well 60.

The operation of the lithium bromide heat pump 31 and the electric heat pump 52 according to the present utility model will be described in detail below.

The lithium bromide heat pump 31 has a generator 311, a condenser 312, an absorber 313 and an evaporator 314, the dilute solution pump pumps out the dilute solution in the absorber 313, the dilute solution is heated by a heat exchanger and then enters the generator 311, the generator 311 is continuously heated by high-temperature geothermal water, the concentrated solution is obtained, and high-temperature refrigerant steam is generated. The concentrated solution passes through the heat transfer pipe of the heat exchanger, and after the diluted solution flowing to the generator 311 in the heating pipe, the temperature is reduced and then returns to the absorber 313. The high-temperature refrigerant vapor generated in the generator 311 flows into the condenser 312, heats the cooling water flowing through the heat transfer pipes of the condenser 312, discharges heat, condenses into refrigerant water, and enters the evaporator 314 through the U-shaped pipe throttling. Because the pressure in the evaporator 314 is low, a part of the refrigerant water entering the evaporator 314 flashes into refrigerant vapor, and another part of the refrigerant water is carried away by the part of the flash heat to be cooled into refrigerant water with saturated temperature, and the refrigerant water flows into a liquid sac at the bottom of the evaporator 314. The refrigerant water entering the refrigerant water sac of the evaporator 314 is pumped by the refrigerant pump to be sprayed on the surface of the heat transfer pipe of the evaporator 314, absorbs the heat of the residual heat water flowing through the heat transfer pipe and boils and evaporates to become refrigerant steam. The concentrated solution entering the absorber 313 becomes diluted in concentration after absorbing the refrigerant vapor, flows into the bottom solution sac, is pumped into the absorber 313 by the intermediate solution pump, becomes diluted again after the absorber 313 continues to absorb the refrigerant vapor, and flows into the bottom solution sac to be pumped into the generator 311 by the diluted solution pump. The residual hot water is cooled after the heat is carried by the coolant water and flows out of the unit. The low-temperature water from the user hot water system flows through the absorber 313 and is heated by the heat absorbed by the outside of the tube, enters the condenser 312 after the temperature is increased, is continuously heated by the high-temperature refrigerant steam outside of the tube in the condenser 312, flows out of the unit after the temperature is increased again, and enters the user hot water system. The process is continuously and circularly carried out, so that the heat of the waste heat water can be continuously recovered and the hot water with the required temperature can be prepared.

In winter, the dilute solution pump pumps out the lithium bromide dilute solution in the absorber 313, the lithium bromide dilute solution is heated by the heat exchanger and then enters the generator 311, the high-temperature geothermal water in the third geothermal water pipeline 32 enters the generator 311 for heat exchange, and the lithium bromide dilute solution in the generator 311 is heated and concentrated into a concentrated solution, and meanwhile high-temperature refrigerant steam is generated. The high-temperature refrigerant vapor generated in the generator 311 flows into the condenser 312, heats the user backwater flowing through the second backwater pipeline 34 of the flowing pipeline in the condenser 312, condenses the refrigerant vapor into refrigerant water after releasing heat, throttles the refrigerant water into the evaporator 314 by the U-shaped pipe, and flashes part of the refrigerant water entering the evaporator 314 into the refrigerant vapor, and the other part of the refrigerant water is taken away by the part of the heat which flashes and is cooled to saturated temperature, and flows into the liquid sac at the bottom of the evaporator 314. The refrigerant water entering the refrigerant water sac of the evaporator 314 is pumped by the refrigerant pump to be sprayed on the surface of the heat transfer pipe of the evaporator 314, absorbs the heat of the geothermal well water entering the evaporator 314 through the fifth geothermal water pipe 42 after heat exchange of the second plate heat exchanger 41 in the heat transfer pipe, and boils and evaporates to become refrigerant steam. The concentrated solution entering the absorber 313 becomes diluted in concentration after absorbing the refrigerant vapor, flows into the bottom solution sac, is pumped into the absorber 313 by the intermediate solution pump, becomes diluted again after the absorber 313 continues to absorb the refrigerant vapor, and flows into the bottom solution sac to be pumped into the generator 311 by the diluted solution pump. Geothermal well water in the evaporator 314 is cooled as heat is carried away by the coolant water and flows out of the unit. The user backwater of the second backwater pipeline 34 flows through the inside of the flow pipeline of the absorber 313, is heated by the liquefied heat release of the refrigerant vapor outside the pipeline, enters the condenser 312 after the temperature is increased, is continuously heated by the high-temperature refrigerant vapor outside the pipeline in the condenser 312, flows out of the unit after the temperature is increased again, and enters the second water supply pipeline 35. The geothermal well water after heat exchange of the evaporator 314 is taken as geothermal tail water to enter the geothermal water pumping and filling unit 10 through the sixth geothermal water pipeline 43, and the recharging filter 12 removes impurity particles in the geothermal tail water and recharges the impurity particles into the geothermal well 60;

In summer, the whole process is as above, the high-temperature geothermal water of the third geothermal water pipe 32 enters the generator 311 to exchange heat, but the liquid flowing through the flow pipes inside the absorber 313 and the condenser 312 is the cooling water of the cooling tower 101, and the liquid exchanged in the evaporator 314 is a part of the user backwater to be cooled in the fifth backwater pipe 301.

The electric heat pump 52 has an evaporator, a compressor, a condenser and an expansion valve, wherein a refrigerant circulates in the electric heat pump 52, the compressor compresses the refrigerant from medium-temperature low-pressure gas to high-temperature high-pressure gas, the high-temperature high-pressure gas is condensed into medium-temperature high-pressure liquid by the condenser, and the medium-temperature high-pressure liquid becomes low-temperature low-pressure liquid after being throttled by the throttle valve. The low-temperature low-pressure liquid refrigerant is sent into an evaporator, absorbs heat and evaporates in the evaporator to become medium-temperature low-pressure steam, and the medium-temperature low-pressure steam is sent into a compressor again, so that the refrigeration cycle is completed.

In winter, the space between the third plate heat exchanger 51 and the electric heat pump 52 is equivalent to an evaporator, the refrigerant with low temperature and low pressure in the electric heat pump 52 enters the third plate heat exchanger 51 through the first circulating pipeline 54, the refrigerant in the third plate heat exchanger 51 exchanges heat with geothermal well water, the heated refrigerant enters the electric heat pump 52 through the second circulating pipeline 55, the user backwater of the fourth backwater pipeline 56 enters the condenser in the electric heat pump 52 to be heated by high temperature and high pressure gas, and the heated user backwater is conveyed to the fourth water supply pipeline 57 of the user side 70 and enters the water supply header 90 to be supplied to the user side 70;

In summer, another part of user backwater enters the electric heat pump 52 from the tenth water inlet 521 through the other water outlet end of the fifth water return pipeline 301, the user backwater exchanges heat with the refrigerant in the evaporator of the electric heat pump 52, and the cooled user backwater is conveyed to the sixth water supply pipeline 503 of the user side 70 and enters the water supply main 90 to be supplied to the user side 70; the cooling water of the first cooling water pipe 102 enters the condenser of the electric heat pump 52 through the third cooling water pipe 501 to be heated by the high-temperature and high-pressure gas, and the heated cooling water enters the second cooling water pipe 103 through the fourth cooling water pipe 502 to enter the cooling tower 101 to be cooled for recirculation.

The operation of the system provided by the present utility model is described below from one specific embodiment.

In winter, the first stop valve 110, the second stop valve 111, the third stop valve 112, the fourth stop valve 113, the fifth stop valve 114, the sixth stop valve 115, the seventh stop valve 116, the eighth stop valve 117, the ninth stop valve 118, the tenth stop valve 119, the eleventh stop valve 120, the eleventh stop valve 121, the thirteenth stop valve 122, and the fourteenth stop valve 123 are opened, and the fifteenth stop valve 124, the sixteenth stop valve 125, the seventeenth stop valve 126, the eighteenth stop valve 127, the nineteenth stop valve 128, the twentieth stop valve 129, the twenty-first stop valve 130, and the twenty-second stop valve 131 are closed; at this time, the geothermal water pumping irrigation unit 10, the first plate heat exchange unit 20, the lithium bromide heat pump unit 30, the second plate heat exchange unit 40, and the third heat exchange unit 50 are in an operating state. The geothermal well water is extracted from the geothermal well 60 by the geothermal water pumping and filling unit 10, and the cyclone sand remover 11 filters impurities in the geothermal well water extracted by the geothermal water pumping and filling unit 10 and conveys the filtered geothermal well water to the first plate heat exchange unit 20 and the lithium bromide heat pump unit 30; the hot water pumping and filling unit 10 extracts part of geothermal well water, the part of geothermal well water enters the first plate heat exchanger 21 through the first geothermal water pipeline 22 to exchange heat, a first part of user backwater to be heated of the user side 70 enters the first backwater pipeline 24 through the backwater main pipe 80, the user backwater of the first backwater pipeline 24 enters the first plate heat exchanger 21, the user backwater and geothermal well water in the first plate heat exchanger 21 exchange heat, and the heated user backwater is conveyed to the first water supply pipeline 25 of the user side 70 and enters the water supply main pipe 90 to be supplied to the user side 70;

The geothermal well water subjected to heat exchange by the first plate heat exchanger 21 enters the second plate heat exchanger 41 through the second geothermal water pipeline 23, a second part of user backwater to be heated of the user side 70 enters the third backwater pipeline 44 through the backwater main pipeline 80, the user backwater of the third backwater pipeline 44 enters the second plate heat exchanger 41, the user backwater and the geothermal well water in the second plate heat exchanger 41 exchange heat, and the heated user backwater is conveyed to the third water supply pipeline 45 of the user side 70 and enters the water supply main pipeline 90 to be supplied to the user side 70;

The other part of geothermal well water extracted by the geothermal water pumping and filling unit 10 is filtered by the cyclone sand remover 11, and enters the generator 311 for heat exchange through the third geothermal water pipeline 32, and geothermal well water subjected to heat exchange by the second plate heat exchanger 41 enters the evaporator 314 for heat exchange through the fifth geothermal water pipeline 42; the third part of the user backwater to be heated of the user side 70 enters the second backwater pipeline 34 through the backwater main pipe 80, the user backwater of the second backwater pipeline 34 enters the absorber 313, the absorber 313 is communicated with the inside of the condenser 312 through a pipeline, a circulation pipeline is arranged between the fifth water inlet 3131 and the fifth water outlet 3121, the user backwater is heated in the absorber 313 and the condenser 312 through the circulation pipeline, and the heated user backwater is conveyed to the second water supply pipeline 35 of the user side 70 and enters the water supply main pipe 90 to be supplied to the user side 70; the geothermal well water after heat exchange of the evaporator 314 is taken as geothermal tail water to enter the geothermal water pumping and filling unit 10 through the sixth geothermal water pipeline 43, and the recharging filter 12 removes impurity particles in the geothermal tail water and recharges the impurity particles into the geothermal well 60;

Geothermal well water subjected to heat exchange by the generator 311 enters the third plate heat exchanger 51 through the fourth geothermal water pipeline 33 to exchange heat; a fourth part of user backwater to be heated of the user side 70 enters the fourth backwater pipeline 56 through the backwater main pipe 80, the user backwater of the fourth backwater pipeline 56 enters the electric heat pump 52 for heating, and the heated user backwater is conveyed to the fourth water supply pipeline 57 of the user side 70 and enters the water supply main pipe 90 to be supplied to the user side 70; a first circulating pipeline 54 and a second circulating pipeline 55 are connected between the third plate heat exchanger 51 and the electric heat pump 52, the refrigerant in the electric heat pump 52 circulates between the electric heat pump 52 and the third plate heat exchanger 51 through the first circulating pipeline 54 and the second circulating pipeline 55, the refrigerant in the electric heat pump 52 enters the third plate heat exchanger 51 through the first circulating pipeline 54, the refrigerant in the third plate heat exchanger 51 exchanges heat with geothermal well water, the heated refrigerant enters the electric heat pump 52 through the second circulating pipeline 55, geothermal well water after heat exchange of the third plate heat exchanger 51 enters the geothermal water pumping and filling unit 10 through the seventh geothermal water pipeline 53 as geothermal tail water, and the recharging filter 12 removes impurity particles in the geothermal tail water and recharges the geothermal well 60.

In summer, the first stop valve 110, the second stop valve 111, the third stop valve 112, the fifth stop valve 114, the sixth stop valve 115, the seventh stop valve 116, the eighth stop valve 117, the ninth stop valve 118, the tenth stop valve 119, the eleventh stop valve 120, the eleventh stop valve 121, the thirteenth stop valve 122, and the fourteenth stop valve 123 are closed, and the fourth stop valve 113, the fifteenth stop valve 124, the sixteenth stop valve 125, the seventeenth stop valve 126, the eighteenth stop valve 127, the nineteenth stop valve 128, the twentieth stop valve 129, the twenty-first stop valve 130, and the twenty-second stop valve 131 are opened; at this time, the geothermal water pumping unit 10, the lithium bromide heat pump unit 30, the third heat exchanging unit 50, and the cooling unit 100 are in an operating state.

The geothermal well water is extracted from the geothermal well 60 through the geothermal water pumping and filling unit 10, the cyclone sand remover 11 filters impurities in the geothermal well water extracted by the geothermal water pumping and filling unit 10 and conveys all the geothermal well water after filtration into the generator 311 for heat exchange; the user backwater to be cooled of the user side 70 enters the fifth backwater pipeline 301 through the backwater main pipe 80, a part of the user backwater enters the evaporator 314 through the fifth backwater pipeline 301 to be cooled, and the cooled user backwater is conveyed to the fifth water supply pipeline 302 of the user side 70 and enters the water supply main pipe 90 to be supplied to the user side 70; part of cooling water of the cooling tower 101 enters the second water return pipeline 34 through the first cooling water pipeline 102, the second water return pipeline 34 conveys the cooling water of the first cooling water pipeline 102 into the absorber 313 through the fifth water inlet 3131 for heat exchange, the inside of the absorber 313 is communicated with the inside of the condenser 312 through pipelines, a circulation pipeline is arranged between the fifth water inlet 3131 and the fifth water outlet 3121, the cooling water is heated in the absorber 313 and the condenser 312 through the circulation pipeline, the heated cooling water is conveyed into the second water supply pipeline 35, the second water supply pipeline 35 conveys the heated cooling water into the second cooling water pipeline 103 to enter the cooling tower 101 for cooling for recirculation; the geothermal well water subjected to heat exchange by the generator 311 is taken as geothermal tail water and enters the geothermal water pumping and filling unit 10 through the eighth geothermal water pipeline 303, and the recharging filter 12 removes impurity particles in the geothermal tail water and recharges the impurity particles into the geothermal well 60;

The other part of user backwater enters the electric heat pump 52 from the tenth water inlet 521 through the other water outlet end of the fifth backwater pipeline 301 to be cooled, and the cooled user backwater is conveyed to the sixth water supply pipeline 503 of the user side 70 and enters the water supply main 90 to be supplied to the user side 70; the other part of cooling water of the cooling tower 101 enters the third cooling water pipeline 501 through the first cooling water pipeline 102, the cooling water of the first cooling water pipeline 102 enters the electric heat pump 52 through the third cooling water pipeline 501 for heat exchange, and the heated cooling water enters the second cooling water pipeline 103 through the fourth cooling water pipeline 502 and enters the cooling tower 101 for cooling for recirculation.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A lithium bromide heat pump and electric heat pump combined heating and cooling system, comprising:

the geothermal water pumping and filling unit (10) is used for pumping geothermal well water from a geothermal well (60) or discharging geothermal tail water after heat exchange back to the geothermal well (60);

The geothermal water pumping and filling system comprises a geothermal water pumping and filling unit (10), a first plate heat exchange unit (20), a second plate heat exchange unit (20) and a second water return pipeline (24) at the user side (70), wherein the first plate heat exchange unit (20) is connected with the geothermal water pumping and filling unit (10) and the user side (70) to receive part of geothermal well water pumped by the geothermal water pumping and filling unit (10), and the first plate heat exchange unit (20) is used for carrying out primary heat exchange on part of geothermal well water pumped by the geothermal water pumping and filling unit (10) and user return water of the first water return pipeline (24) at the user side (70) to heat the user return water of the first water return pipeline (24) and convey the user return water to a first water supply pipeline (25) at the user side (70);

A lithium bromide heat pump unit (30), the lithium bromide heat pump unit (30) being connected to both the geothermal water pumping unit (10) and the user side (70) to receive another portion of the geothermal well water pumped by the geothermal water pumping unit (10), the lithium bromide heat pump unit (30) being operated by using energy of the other portion of the geothermal well water to heat user return water of a second return pipe (34) and to deliver the user return water to a second water supply pipe (35) of the user side (70);

The second plate heat exchange unit (40), the second plate heat exchange unit (40) is connected with the first plate heat exchange unit (20) and the lithium bromide heat pump unit (30) respectively, the second plate heat exchange unit (40) is used for carrying out secondary heat exchange on geothermal well water after heat exchange of the first plate heat exchange unit (20) and user backwater of a third backwater pipeline (44) of the user side (70) so as to heat the user backwater of the third backwater pipeline (44) and convey the user backwater to a third water supply pipeline (45) of the user side (70); geothermal well water subjected to heat exchange by the second plate heat exchange unit (40) enters the lithium bromide heat pump unit (30) to perform three-level heat exchange with the lithium bromide heat pump unit (30), and is discharged back to the geothermal well (60) through the geothermal water pumping and filling unit (10);

The third heat exchange unit (50), the third heat exchange unit (50) is connected with the lithium bromide heat pump unit (30), the geothermal water pumping and filling unit (10) and the user side (70), the third heat exchange unit (50) is used for heating the geothermal well water after the lithium bromide heat pump unit (30) is utilized and the user backwater of a fourth backwater pipeline (56) of the user side (70) and conveying the user backwater to a fourth water supply pipeline (57) of the user side (70); wherein, geothermal well water after heat exchange of the third heat exchange unit (50) is discharged back to the geothermal well (60) through the geothermal water pumping and filling unit (10);

A cooling unit (100), wherein the cooling unit (100) is connected with the lithium bromide heat pump unit (30) and the third heat exchange unit (50), and the cooling unit (100) is used for providing circulating cold water for the lithium bromide heat pump unit (30) and the third heat exchange unit (50);

The lithium bromide heat pump unit (30) is further used for exchanging heat of user backwater of a fifth backwater pipeline (301) of the user side (70) so as to cool the user backwater of the fifth backwater pipeline (301) and convey the cooled user backwater to a fifth water supply pipeline (302) of the user side (70);

The third heat exchange unit (50) is further configured to exchange heat with user backwater of a fifth backwater pipeline (301) of the user side (70) so as to cool the user backwater of the fifth backwater pipeline (301) and convey the cooled user backwater to a sixth water supply pipeline (503) of the user side (70).

2. The lithium bromide heat pump and electric heat pump combined heating and cooling system according to claim 1, wherein the first plate heat exchange unit (20) comprises:

The heat exchange device comprises a first plate heat exchanger (21), wherein a first water inlet (211), a first water outlet (212), a second water inlet (213) and a second water outlet (214) are arranged on the first plate heat exchanger (21);

The geothermal water pumping and filling device comprises a geothermal water pumping and filling unit (10), a first geothermal water pipeline (22), a first water inlet (211) and a second water outlet (211), wherein the water inlet end of the first geothermal water pipeline (22) is connected with the geothermal water pumping and filling unit (10), a first stop valve (110) is arranged on the first geothermal water pipeline (22), and the first stop valve (110) is used for controlling part of geothermal well water pumped by the geothermal water pumping and filling unit (10) to enter the first plate-type heat exchanger (21) through the first geothermal water pipeline (22) for heat exchange;

A second geothermal water pipeline (23), wherein a water inlet end of the second geothermal water pipeline (23) is connected with the first water outlet (212), a water outlet end of the second geothermal water pipeline (23) is connected with the second plate heat exchange unit (40), and the second geothermal water pipeline (23) is used for enabling geothermal well water subjected to heat exchange of the first plate heat exchanger (21) to enter the second plate heat exchange unit (40);

The water inlet end of the first water return pipeline (24) is connected with a water return main pipe (80) of the user side (70), the water outlet end of the first water return pipeline (24) is connected with the second water inlet (213), a second stop valve (111) is arranged on the first water return pipeline (24), and the second stop valve (111) is used for controlling the user water return to enter the first plate heat exchanger (21) for heating through the first water return pipeline (24);

The water supply system comprises a first water supply pipeline (25), wherein the water outlet end of the first water supply pipeline (25) is connected with a water supply main pipe (90) of a user side (70), the water inlet end of the first water supply pipeline (25) is connected with a second water outlet (214), a third stop valve (112) is arranged on the first water supply pipeline (25), and the third stop valve (112) is used for controlling the user backwater heated by the first plate heat exchanger (21) to be conveyed to the user side (70) through the first water supply pipeline (25).

3. The lithium bromide heat pump and electric heat pump combined heating and cooling system according to claim 2, wherein the lithium bromide heat pump unit (30) comprises:

A lithium bromide heat pump (31), the lithium bromide heat pump (31) having a generator (311), a condenser (312), an absorber (313) and an evaporator (314), the generator (311) having a third water inlet (3111) and a third water outlet (3112), the evaporator (314) having a fourth water inlet (3141) and a fourth water outlet (3142), the condenser (312) having a fifth water outlet (3121), the absorber (313) having a fifth water inlet (3131);

The water inlet end of the third geothermal water pipeline (32) is connected with the geothermal water pumping and filling unit (10), the water outlet end of the third geothermal water pipeline (32) is connected with the third water inlet (3111), a fourth stop valve (113) is arranged on the third geothermal water pipeline (32), and the fourth stop valve (113) is used for controlling the other part of geothermal well water pumped by the geothermal water pumping and filling unit (10) to enter the generator (311) for heat exchange through the third geothermal water pipeline (32);

A fourth geothermal water pipeline (33), wherein a water inlet end of the fourth geothermal water pipeline (33) is connected with the third water outlet (3112), a water outlet end of the fourth geothermal water pipeline (33) is connected with the third heat exchange unit (50), a fifth stop valve (114) is arranged on the fourth geothermal water pipeline (33), and the fifth stop valve (114) is used for controlling geothermal well water subjected to heat exchange by the generator (311) to enter the third heat exchange unit (50) through the fourth geothermal water pipeline (33);

A second water return pipe (34), wherein a water inlet end of the second water return pipe (34) is connected with a water return main pipe (80) of the user side (70), a water outlet end of the second water return pipe (34) is connected with the fifth water inlet (3131), and the second water return pipe (34) is used for enabling the user water return to enter the lithium bromide heat pump (31) through the first water return pipe (24) for heating;

The water supply system comprises a second water supply pipeline (35), wherein the water inlet end of the second water supply pipeline (35) is connected with a fifth water outlet (3121), the water outlet end of the second water supply pipeline (35) is connected with a water supply main pipe (90) of a user side (70), a sixth stop valve (115) is arranged on the second water supply pipeline (35), and the sixth stop valve (115) is used for controlling the user backwater heated by the lithium bromide heat pump (31) to be conveyed to the user side (70) through the second water supply pipeline (35).

4. A lithium bromide heat pump and electric heat pump combined heating and cooling system according to claim 3 wherein the second plate heat exchange unit (40) comprises:

A second plate heat exchanger (41), wherein a sixth water inlet (411), a sixth water outlet (412), a seventh water inlet (413) and a seventh water outlet (414) are arranged on the second plate heat exchanger (41); the sixth water inlet (411) is connected with the first water outlet (212) through the second geothermal water pipeline (23), and the second geothermal water pipeline (23) is used for enabling geothermal well water subjected to heat exchange of the first plate heat exchanger (21) to enter the second plate heat exchanger (41) for heat exchange;

A fifth geothermal water pipeline (42), wherein a water inlet end of the fifth geothermal water pipeline (42) is connected with the sixth water outlet (412), a water outlet end of the fifth geothermal water pipeline (42) is connected with the fourth water inlet (3141), a seventh stop valve (116) is arranged on the fifth geothermal water pipeline (42), and the seventh stop valve (116) is used for controlling geothermal well water subjected to heat exchange of the second plate heat exchanger (41) to enter the evaporator (314) for heat exchange;

A sixth geothermal water pipeline (43), wherein a water inlet end of the sixth geothermal water pipeline (43) is connected with the fourth water outlet (3142), a water outlet end of the sixth geothermal water pipeline (43) is connected with the geothermal water pumping and filling unit (10), an eighth stop valve (117) is arranged on the sixth geothermal water pipeline (43), and the eighth stop valve (117) is used for controlling geothermal well water subjected to heat exchange of the evaporator (314) to be discharged back to the geothermal well (60) through the geothermal water pumping and filling unit (10);

A third water return pipe (44), wherein the water inlet end of the third water return pipe (44) is connected with a water return main pipe (80) of the user side (70), the water outlet end of the third water return pipe (44) is connected with the seventh water inlet (413), a ninth stop valve (118) is arranged on the third water return pipe (44), and the ninth stop valve (118) is used for controlling the user water return to enter the second plate heat exchanger (41) for heating through the third water return pipe (44);

The water supply system comprises a third water supply pipeline (45), wherein the water outlet end of the third water supply pipeline (45) is connected with a water supply main pipe (90) of a user side (70), the water inlet end of the third water supply pipeline (45) is connected with a seventh water outlet (414), a tenth stop valve (119) is arranged on the third water supply pipeline (45), and the tenth stop valve (119) is used for controlling the user backwater heated by the second plate heat exchanger (41) to be conveyed to the user side (70) through the third water supply pipeline (45).

5. The lithium bromide heat pump and electric heat pump combined heating and cooling system according to claim 4, wherein the third heat exchange unit (50) comprises:

A third plate heat exchanger (51), wherein an eighth water inlet (511), an eighth water outlet (512), a ninth water inlet (513) and a ninth water outlet (514) are arranged on the third plate heat exchanger (51); the third water outlet (3112) is connected with the eighth water inlet (511) through the fourth geothermal water pipeline (33), and the fourth geothermal water pipeline (33) is used for enabling geothermal well water after heat exchange of the generator (311) to enter the third heat exchange unit (50) for heat exchange;

An electric heat pump (52), wherein a tenth water inlet (521), a tenth water outlet (522), an eleventh water inlet (523) and an eleventh water outlet (524) are arranged on the electric heat pump (52);

A seventh geothermal water pipe (53), wherein a water inlet end of the seventh geothermal water pipe (53) is connected with the eighth water outlet (512), a water outlet end of the seventh geothermal water pipe (53) is connected with the geothermal water pumping and filling unit (10), and the seventh geothermal water pipe (53) is used for discharging geothermal well water after heat exchange of the third plate heat exchanger (51) back to the geothermal well (60) through the geothermal water pumping and filling unit (10);

The water inlet end of the first circulating pipeline (54) is connected with the tenth water outlet (522), the water outlet end of the first circulating pipeline (54) is connected with the ninth water inlet (513), an eleventh stop valve (120) is arranged on the first circulating pipeline (54), and the eleventh stop valve (120) is used for controlling the refrigerant in the electric heating pump (52) to enter the third plate heat exchanger (51) for heat exchange;

The water inlet end of the second circulation pipeline (55) is connected with the ninth water outlet (514), the water outlet end of the second circulation pipeline (55) is connected with the tenth water inlet (521), a twelfth stop valve (121) is arranged on the second circulation pipeline (55), and the twelfth stop valve (121) is used for controlling the heated refrigerant to enter the electric heating pump (52);

A fourth water return pipe (56), wherein a water inlet end of the fourth water return pipe (56) is connected with a water return main pipe (80) of the user side (70), a water outlet end of the fourth water return pipe (56) is connected with the eleventh water inlet (523), a thirteenth stop valve (122) is arranged on the fourth water return pipe (56), and the thirteenth stop valve (122) is used for controlling the user water return to enter the electric heating pump (52) for heating through the fourth water return pipe (56);

The water outlet end of the fourth water supply pipeline (57) is connected with a water return main pipe (80) of the user side (70), the water inlet end of the fourth water supply pipeline (57) is connected with an eleventh water outlet (524), a fourteenth stop valve (123) is arranged on the fourth water supply pipeline (57), and the fourteenth stop valve (123) is used for controlling the user water after being heated by the electric heating pump (52) to be conveyed to the user side (70) through the fourth water supply pipeline (57).

6. The lithium bromide heat pump and electric heat pump combined heating and cooling system according to claim 5, wherein the cooling unit (100) comprises:

a cooling tower (101), the cooling tower (101) having a twelfth water inlet (1011) and a twelfth water outlet (1012);

A first cooling water pipeline (102), wherein a water inlet of the first cooling water pipeline (102) is connected with the twelfth water outlet (1012), a water outlet of the first cooling water pipeline (102) is connected with the lithium bromide heat pump unit (30) and the third heat exchange unit (50), a fifteenth stop valve (124) is arranged on the first cooling water pipeline (102), and the fifteenth stop valve (124) is used for controlling cooling water of the cooling tower (101) to enter the lithium bromide heat pump unit (30) and the third heat exchange unit (50) for heat exchange through the first cooling water pipeline (102);

The water outlet of second cooling water pipeline (103) with twelfth water inlet (1011) is connected, the water inlet of second cooling water pipeline (103) with lithium bromide heat pump unit (30) with third heat transfer unit (50) all are connected, be provided with sixteenth stop valve (125) on second cooling water pipeline (103), sixteenth stop valve (125) are used for controlling cooling water after lithium bromide heat pump unit (30) with third heat transfer unit (50) heat transfer get into cooling tower (101) cooling in order to recycle.

7. The lithium bromide heat pump and electric heat pump combined heating and cooling system according to claim 6, wherein the lithium bromide heat pump unit (30) further comprises:

A fifth water return pipe (301), wherein a water inlet end of the fifth water return pipe (301) is connected with a water return main pipe (80) of the user side (70), a water outlet end of the fifth water return pipe (301) is connected with the fourth water inlet (3141), a seventeenth stop valve (126) is arranged on the fifth water return pipe (301), and the seventeenth stop valve (126) is used for controlling user water return of the user side (70) to enter the evaporator (314) for cooling through the fifth water return pipe (301);

A fifth water supply pipeline (302), wherein a water inlet end of the fifth water supply pipeline (302) is connected with the fourth water outlet (3142), a water outlet end of the fifth water supply pipeline (302) is connected with a water supply main pipe (90) of the user side (70), an eighteenth stop valve (127) is arranged on the fifth water supply pipeline (302), and the eighteenth stop valve (127) is used for controlling the user backwater cooled by the evaporator (314) to be conveyed to the user side (70) through the fifth water supply pipeline (302);

An eighth geothermal water pipeline (303), wherein a water inlet end of the eighth geothermal water pipeline (303) is connected with the third water outlet (3112), a water outlet end of the eighth geothermal water pipeline (303) is connected with the geothermal water pumping and filling unit (10), a twenty-second stop valve (131) is arranged on the eighth geothermal water pipeline (303), and the twenty-second stop valve (131) is used for controlling geothermal well water subjected to heat exchange by the generator (311) to enter the geothermal water pumping and filling unit (10) through the eighth geothermal water pipeline (303) so as to be discharged back to the geothermal well (60);

The second water return pipeline (34) is connected with the first cooling water pipeline (102), and the second water return pipeline (34) is further used for conveying cooling water of the first cooling water pipeline (102) into the lithium bromide heat pump (31) through the fifth water inlet (3131) for heat exchange;

the second water supply pipeline (35) is connected with the second cooling water pipeline (103), and the second water supply pipeline (35) is further used for conveying the cooling water subjected to heat exchange of the lithium bromide heat pump (31) into the second cooling water pipeline (103) through the fifth water outlet (3121).

8. The lithium bromide heat pump and electric heat pump combined heating and cooling system according to claim 7, wherein the third heat exchange unit (50) further comprises:

A third cooling water pipeline (501), wherein the water inlet end of the third cooling water pipeline (501) is connected with the water outlet end of the first cooling water pipeline (102), the water outlet end of the third cooling water pipeline (501) is connected with the eleventh water inlet (523), a nineteenth stop valve (128) is arranged on the third cooling water pipeline (501), and the nineteenth stop valve (128) is used for controlling cooling water of the first cooling water pipeline (102) to enter the electric heating pump (52) for heat exchange through the third cooling water pipeline (501);

A fourth cooling water pipeline (502), wherein the water inlet end of the fourth cooling water pipeline (502) is connected with the eleventh water outlet (524), the water outlet end of the fourth cooling water pipeline (502) is connected with the water inlet end of the second cooling water pipeline (103), a twenty-second stop valve (129) is arranged on the fourth cooling water pipeline (502), and the twenty-second stop valve (129) is used for controlling cooling water subjected to heat exchange of the electric heating pump (52) to enter the second cooling water pipeline (103) through the fourth cooling water pipeline (502);

A sixth water supply pipeline (503), wherein a water inlet end of the sixth water supply pipeline (503) is connected with the tenth water outlet (522), a water outlet end of the sixth water supply pipeline (503) is connected with a water supply main pipe (90) of the user side (70), a twenty-first stop valve (130) is arranged on the sixth water supply pipeline (503), and the twenty-first stop valve (130) is used for controlling the user backwater cooled by the electric heating pump (52) to be conveyed to the user side (70) through the sixth water supply pipeline (503);

The other water outlet end of the fifth water return pipeline (301) is connected with the tenth water inlet (521), and the other part of the user backwater on the user side (70) enters the electric heating pump (52) for cooling through the fifth water return pipeline (301).

9. The lithium bromide heat pump and electric heat pump combined heating and cooling system according to claim 1, wherein the geothermal water pumping and irrigating unit (10) further comprises:

The cyclone sand remover (11), the cyclone sand remover (11) is connected with the geothermal well (60), the first plate heat exchange unit (20) and the lithium bromide heat pump unit (30), and the cyclone sand remover (11) is used for filtering impurities in the geothermal well water extracted by the geothermal water pumping and filling unit (10) and conveying the filtered geothermal well water to the first plate heat exchange unit (20) and the lithium bromide heat pump unit (30);

And the recharging filter (12) is connected with the third heat exchange unit (50), the lithium bromide heat pump unit (30) and the geothermal well (60), and the recharging filter (12) is used for removing impurity particles in geothermal tail water and recharging the impurity particles into the geothermal well (60).