Series-connection large-temperature-difference efficient heat pump system

Abstract

The utility model relates to a series-connection large-temperature-difference efficient heat pump system which comprises a first heat pump assembly, a second heat pump assembly, a water inlet pipeline assembly and a heat exchanger assembly. The first heat pump assembly comprises a first water-cooled evaporator, a first compressor and a first water-cooled condenser; the first water-cooling evaporator is connected with the first compressor, and the other end of the first compressor is connected with the first water-cooling condenser; the second heat pump assembly comprises a second water-cooled evaporator, a second compressor and a second water-cooled condenser; the second water-cooling evaporator is connected with the second compressor, and the other end of the second compressor is connected with the second water-cooling condenser; the water inlet pipeline assembly is connected with the first water-cooled evaporator and the second water-cooled evaporator in parallel. The heat exchanger assembly is connected with the first water-cooled condenser and the second water-cooled condenser in series. The utility model meets the requirements of users with large temperature difference.

Description

Technical Field

[0001] The utility model relates to a series-connected high-efficiency heat pump system with a large temperature difference. Background Art

[0002] In the current situation of tightening energy supply and increasing environmental protection requirements, people are constantly looking for new energy sources that are both energy-saving and environmentally friendly. Heat pumps are one of these new energy sources. Since heat pumps can transfer low-temperature heat energy to high-temperature heat energy, they can make full use of the heat in natural resources and waste heat resources, effectively saving the primary energy required for civil and industrial use. As a new heating technology, heat pumps have not only received widespread attention, but have also been rapidly applied to practical projects and have achieved good results.

[0003] The existing conventional heat pump system has a user-side hot water temperature difference of only 10 degrees, which cannot meet the needs of users with large temperature differences (such as 20°C), causing inconvenience in use. Therefore, a series large temperature difference and high-efficiency heat pump system is proposed to address the above problems. Utility Model Content

[0004] The utility model aims to overcome the existing defects and provide a series-connected high-efficiency heat pump system with a large temperature difference to meet the needs of users with a large temperature difference.

[0005] The technical solution to achieve the above-mentioned purpose is: a series-connected large temperature difference and high-efficiency heat pump system, comprising a first heat pump component, a second heat pump component, a water inlet pipe component and a heat exchanger component; the first heat pump component comprises a first water-cooled evaporator, a first compressor and a first water-cooled condenser; the first water-cooled evaporator is connected to the first compressor, and the other end of the first compressor is connected to the first water-cooled condenser; the second heat pump component comprises a second water-cooled evaporator, a second compressor and a second water-cooled condenser; the second water-cooled evaporator is connected to the second compressor, and the other end of the second compressor is connected to the second water-cooled condenser; the water inlet pipe component is connected to the first water-cooled evaporator and the second water-cooled evaporator in parallel; the heat exchanger component is connected to the first water-cooled condenser and the second water-cooled condenser in series.

[0006] Preferably, the heat exchanger assembly includes a primary hot water heat exchanger and a secondary hot water heat exchanger, the cooling water outlet pipe of the second water-cooled condenser is connected to the primary hot water heat exchanger, the other end of the primary hot water heat exchanger is connected to the secondary hot water heat exchanger through a first water pipe, the other end of the secondary hot water heat exchanger is connected to the first water-cooled evaporator through a second water pipe, and the first water-cooled evaporator is connected to the second water-cooled condenser through a third water pipe;

[0007] The first user return water pipeline is connected to the secondary hot water heat exchanger, and the secondary hot water heat exchanger is connected to the primary hot water heat exchanger through the second user return water pipeline, and the primary hot water heat exchanger is connected to the user hot water outlet pipeline.

[0008] Preferably, the water inlet pipe assembly includes a chilled water inlet pipe and a chilled water outlet pipe, the chilled water inlet pipe is connected in parallel to the water inlets of the first water-cooled evaporator and the second water-cooled evaporator; the chilled water outlet pipe is connected in parallel to the water outlets of the first water-cooled evaporator and the second water-cooled evaporator.

[0009] Preferably, the cooling water outlet pipe, the first water pipe and the second water pipe are connected to the shell side of the first-stage hot water heat exchanger and the second-stage hot water heat exchanger;

[0010] The first user return water pipe, the second user return water pipe and the user hot water outlet pipe are connected to the pipe paths of the primary hot water heat exchanger and the secondary hot water heat exchanger.

[0011] Preferably, the second water pipe, the third water pipe and the cooling water outlet pipe are connected to the pipe paths of the first water-cooled evaporator and the second water-cooled condenser.

[0012] Preferably, a first heat pump throttle is provided between the first water-cooled evaporator and the first water-cooled condenser; and a second heat pump throttle is provided between the second water-cooled evaporator and the second water-cooled condenser.

[0013] Preferably, a circulating water pump is provided on the second water pipe.

[0014] The beneficial effects of the utility model are as follows: the series-connected high-efficiency heat pump system with a large temperature difference first enters the first water-cooled condenser for heat exchange, then enters the second water-cooled condenser for heat exchange to reach the designed hot water temperature, then enters the first-stage heat exchanger for the first heat release and heat exchange, then enters the second-stage hot water heat exchanger for heat release, and then flows out as cooling water outlet; at the same time, the 40-degree hot water on the user side first enters the second-stage hot water heat exchanger and the heat pump cooling water for heat exchange and heat absorption, and then passes through the first-stage hot water heat exchanger for a second temperature increase to 60 degrees, thereby meeting the user's hot water temperature needs and realizing the user's side hot water large temperature difference (20°C) requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the utility model's series-connected large temperature difference high-efficiency heat pump system.

[0016] In the figure: 1. first water-cooled evaporator; 2. first compressor; 3. first water-cooled condenser; 4. second water-cooled evaporator; 5. second compressor; 6. second water-cooled condenser; 7. primary hot water heat exchanger; 8. secondary hot water heat exchanger; 9. cooling water outlet pipe; 10. first water flow pipe; 11. second water flow pipe; 12. third water flow pipe; 13. first user return pipe; 14. second user return pipe; 15. user hot water outlet pipe; 16. chilled water inlet pipe; 17. chilled water outlet pipe. DETAILED DESCRIPTION

[0017] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0018] The utility model will be further described below in conjunction with the accompanying drawings.

[0019] like Figure 1 As shown, a series high-efficiency heat pump system with large temperature difference includes a first heat pump component, a second heat pump component, a water inlet pipe component and a heat exchanger component; the first heat pump component includes a first water-cooled evaporator 1, a first compressor 2 and a first water-cooled condenser 3; the first water-cooled evaporator 1 is connected to the first compressor 2, and the other end of the first compressor 2 is connected to the first water-cooled condenser 3; the second heat pump component includes a second water-cooled evaporator 4, a second compressor 5 and a second water-cooled condenser 6; the second water-cooled evaporator 4 is connected to the second compressor 5, and the other end of the second compressor 5 is connected to the second water-cooled condenser 6; the water inlet pipe component is connected to the first water-cooled evaporator 1 and the second water-cooled evaporator 4 in parallel; the heat exchanger component is connected to the first water-cooled condenser 3 and the second water-cooled condenser 6 in series. A first heat pump throttle 18 is provided between the first water-cooled evaporator 1 and the first water-cooled condenser 3; a second heat pump throttle 19 is provided between the second water-cooled evaporator 4 and the second water-cooled condenser 6.

[0020] Specifically, the heat exchanger assembly includes a primary hot water heat exchanger 7 and a secondary hot water heat exchanger 8, a cooling water outlet pipe 9 of the second water-cooled condenser 6 is connected to the primary hot water heat exchanger 7, the other end of the primary hot water heat exchanger 7 is connected to the secondary hot water heat exchanger 8 through a first water pipe 10, the other end of the secondary hot water heat exchanger 8 is connected to the first water-cooled evaporator 1 through a second water pipe 11, and the first water-cooled evaporator 1 is connected to the second water-cooled condenser 6 through a third water pipe 12; the first user return water pipe 13 is connected to the secondary hot water heat exchanger 8, the secondary hot water heat exchanger 8 is connected to the primary hot water heat exchanger 7 through a second user return water pipe 14, and the primary hot water heat exchanger 7 is connected to a user hot water outlet pipe 15. A circulating water pump 20 is provided on the second water pipe 11 to provide power for cooling water.

[0021] Specifically, the cooling water outlet pipe 9, the first water pipe 10 and the second water pipe 11 are connected to the shell side of the primary hot water heat exchanger 7 and the secondary hot water heat exchanger 8; the first user return pipe 13, the second user return pipe 14 and the user hot water outlet pipe 15 are connected to the pipe side of the primary hot water heat exchanger 7 and the secondary hot water heat exchanger 8. The second water pipe 11, the third water pipe 12 and the cooling water outlet pipe 9 are connected to the pipe side of the first water-cooled evaporator 1 and the second water-cooled condenser 6.

[0022] Specifically, the water inlet pipe assembly includes a chilled water inlet pipe 16 and a chilled water outlet pipe 17. The chilled water inlet pipe 16 is connected in parallel to the water inlets of the first water-cooled evaporator 1 and the second water-cooled evaporator 4; the chilled water outlet pipe 17 is connected in parallel to the water outlets of the first water-cooled evaporator 1 and the second water-cooled evaporator 4.

[0023] Specifically, the hot water return water on the user side first enters the primary hot water heat exchanger 7, and then enters the secondary hot water heat exchanger 2, and heat is exchanged through the two-stage heat exchangers, thereby achieving the purpose of a large temperature difference between the hot water return water and the hot water outlet water.

[0024] Specifically, the chilled water inlet is divided into two paths and enters the first water-cooled evaporator 1 and the second water-cooled evaporator 4 of the two heat pumps, and then merges to flow out as the chilled water outlet.

[0025] The series high-efficiency heat pump system with large temperature difference is designed so that the cooling water inlet first enters the first water-cooled condenser 3 for heat exchange, then enters the second water-cooled condenser 6 for heat exchange to reach the designed hot water temperature, then enters the first-level heat exchanger 7 for the first heat release and heat exchange, then enters the second-level hot water heat exchanger 8 for heat release, and then flows out as cooling water outlet. Meanwhile, the 40-degree hot water on the user side first enters the second-level hot water heat exchanger 8 for heat exchange and heat absorption with the heat pump cooling water, and then is heated up for the second time through the first-level hot water heat exchanger 7 to reach the designed user hot water temperature, thereby meeting the large temperature difference (20°C) requirement of hot water on the user side.

[0026] The above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model is described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some or all of the technical features therein with equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A series high-efficiency heat pump system with large temperature difference, characterized in that: The invention comprises a first heat pump component, a second heat pump component, a water inlet pipe component and a heat exchanger component; the first heat pump component comprises a first water-cooled evaporator (1), a first compressor (2) and a first water-cooled condenser (3); the first water-cooled evaporator (1) is connected to the first compressor (2), and the other end of the first compressor (2) is connected to the first water-cooled condenser (3); the second heat pump component comprises a second water-cooled evaporator (4), a second compressor (5) and a second water-cooled condenser (6); the second water-cooled evaporator (4) is connected to the second compressor (5), and the other end of the second compressor (5) is connected to the second water-cooled condenser (6); the water inlet pipe component is connected in parallel to the first water-cooled evaporator (1) and the second water-cooled evaporator (4); and the heat exchanger component is connected in series to the first water-cooled condenser (3) and the second water-cooled condenser (6).

2. The series-connected high-efficiency heat pump system with large temperature difference according to claim 1, characterized in that: The heat exchanger assembly comprises a primary hot water heat exchanger (7) and a secondary hot water heat exchanger (8); the cooling water outlet pipe (9) of the second water-cooled condenser (6) is connected to the primary hot water heat exchanger (7); the other end of the primary hot water heat exchanger (7) is connected to the secondary hot water heat exchanger (8) via a first water pipe (10); the other end of the secondary hot water heat exchanger (8) is connected to the first water-cooled evaporator (1) via a second water pipe (11); the first water-cooled evaporator (1) is connected to the second water-cooled condenser (6) via a third water pipe (12); The first user return water pipe (13) is connected to the secondary hot water heat exchanger (8), the secondary hot water heat exchanger (8) is connected to the primary hot water heat exchanger (7) via the second user return water pipe (14), and the primary hot water heat exchanger (7) is connected to a user hot water outlet pipe (15).

3. The series-connected high-efficiency heat pump system with large temperature difference according to claim 1, characterized in that: The water inlet pipe assembly comprises a chilled water inlet pipe (16) and a chilled water outlet pipe (17); the chilled water inlet pipe (16) is connected in parallel to the water inlets of the first water-cooled evaporator (1) and the second water-cooled evaporator (4); the chilled water outlet pipe (17) is connected in parallel to the water outlets of the first water-cooled evaporator (1) and the second water-cooled evaporator (4).

4. The series-connected high-efficiency heat pump system with large temperature difference according to claim 2, characterized in that: The cooling water outlet pipe (9), the first water pipe (10) and the second water pipe (11) are connected to the shell side of the first hot water heat exchanger (7) and the second hot water heat exchanger (8); The first user water return pipe (13), the second user water return pipe (14) and the user hot water outlet pipe (15) are connected to the pipe paths of the primary hot water heat exchanger (7) and the secondary hot water heat exchanger (8).

5. The series-connected high-efficiency heat pump system with large temperature difference according to claim 2, characterized in that: The second water flow pipe (11), the third water flow pipe (12) and the cooling water outlet pipe (9) are connected to the pipe paths of the first water-cooled evaporator (1) and the second water-cooled condenser (6).

6. The series-connected high-efficiency heat pump system with large temperature difference according to claim 1, characterized in that: A first heat pump throttle (18) is provided between the first water-cooled evaporator (1) and the first water-cooled condenser (3); and a second heat pump throttle (19) is provided between the second water-cooled evaporator (4) and the second water-cooled condenser (6).

7. The series-connected high-efficiency heat pump system with large temperature difference according to claim 2, characterized in that: The second water pipe (11) is provided with a circulating water pump (20).

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