Double-effect jet type heat pump system

Abstract

The utility model relates to a double-effect jet type heat pump system which comprises a generator, a first ejector, a second ejector, a condenser, a liquid storage tank and an evaporator, two ports of the primary side of the generator are connected with a heat source to form a first heat exchange loop, and a secondary side outlet of the generator is connected with a main flow inlet of the first ejector. An outlet of the first ejector is connected with a main flow inlet of the second ejector, an outlet of the second ejector is connected with a primary side inlet of the condenser and a secondary flow inlet of the first ejector, and a primary side outlet of the condenser is connected with a liquid storage tank and a secondary side inlet of the evaporator. Two secondary side ports of the condenser are connected with the heat supply tail end to form a heat supply loop, the liquid storage tank is connected with a secondary side inlet of the generator, a secondary side outlet of the evaporator is connected with a secondary flow inlet of the second ejector, and two primary side ports of the evaporator are connected with the heat source to form a second heat exchange loop. The device has the advantages of being simple in structure, convenient to operate and control, good in stability, high in safety and high in practicability.

Description

Technical Field

[0001] This utility model relates to a heat pump system, specifically to a dual-effect jet heat pump system with ejectors connected in series. Background Technology

[0002] With economic and social development, the importance of energy conservation is becoming increasingly prominent. However, large amounts of high-temperature wastewater and exhaust gas (low-grade heat energy) generated during industrial development are often directly discharged into the environment without energy recovery, resulting in energy waste and thermal pollution. Heat pumps, as air conditioning or heating devices, have certain technological advantages in the recovery and utilization of industrial waste heat (high-temperature wastewater or exhaust gas), generating significant economic benefits. Compared to traditional heat pumps, jet heat pumps use ejectors instead of compressors, offering advantages such as simple structure, reliable operation, high thermal efficiency, and energy savings. However, jet heat pumps operate using a high-grade heat source as the driving force and supply heat by recovering heat from a low-grade heat source. Due to the large temperature difference between the high and low-grade heat sources, the expansion ratio (mainstream fluid pressure / secondary fluid pressure) and shock wave losses of jet heat pumps are relatively large, affecting ejector efficiency and the overall system COP. Utility Model Content

[0003] The purpose of this invention is to provide a dual-effect jet heat pump system, which has the advantages of simple structure, convenient operation, good stability, high safety and strong practicality.

[0004] To address the aforementioned problems in the existing technology, this utility model provides a dual-effect jet heat pump system, including a generator, a first ejector, a second ejector, a condenser, a storage tank, and an evaporator. The two ports on the primary side of the generator are connected to a heat source via heat exchange pipes to form a first heat exchange loop. The secondary side outlet of the generator is connected to the main flow inlet of the first ejector via a first working fluid pipe. The outlet of the first ejector is connected to the main flow inlet of the second ejector via a second working fluid pipe. The outlet of the second ejector is connected to the primary side inlet of the condenser via a third working fluid pipe. The third working fluid pipe is connected to the secondary flow inlet of the first ejector via a fourth working fluid pipe. The primary side outlet of the condenser... The condenser is connected to the storage tank via the fifth working fluid pipeline. The two ports on the secondary side of the condenser are connected to the heating terminal via heat exchange pipelines to form a heating circuit. The storage tank is connected to the secondary inlet of the generator via the sixth working fluid pipeline. The fifth working fluid pipeline is connected to the secondary inlet of the evaporator via the seventh working fluid pipeline. The secondary outlet of the evaporator is connected to the secondary inlet of the second ejector via the eighth working fluid pipeline. The two ports on the primary side of the evaporator are connected to the heat source via heat exchange pipelines to form a second heat exchange circuit. A working fluid pump is provided on the sixth working fluid pipeline, and a throttling valve is provided on the seventh working fluid pipeline. The system also includes control devices connected to the first ejector, the second ejector, the working fluid pump, and the throttling valve respectively.

[0005] Optionally, the present invention provides a dual-effect jet heat pump system, which further includes a heat exchanger, wherein the two ports on the primary side of the heat exchanger are connected in series in the second working fluid pipeline, and the two ports on the secondary side of the heat exchanger are connected in series in the sixth working fluid pipeline.

[0006] Furthermore, this utility model provides a dual-effect jet heat pump system, wherein the working fluid pump is installed on the sixth working fluid pipeline between the heat exchanger and the liquid storage tank.

[0007] Optionally, the present invention provides a dual-effect jet heat pump system, which further includes a heat exchanger, wherein the two ports on the primary side of the heat exchanger are connected in series in a third working fluid pipeline, and the two ports on the secondary side of the heat exchanger are connected in series in a sixth working fluid pipeline.

[0008] Furthermore, this utility model provides a dual-effect jet heat pump system, wherein the working fluid pump is installed on the sixth working fluid pipeline between the heat exchanger and the liquid storage tank.

[0009] Furthermore, in this utility model, a dual-effect jet heat pump system is provided, wherein the connection point between the fourth working fluid pipeline and the third working fluid pipeline is located between the heat exchanger and the condenser.

[0010] Optionally, the present invention provides a dual-effect jet heat pump system, which further includes a heat exchanger, wherein the two ports on the primary side of the heat exchanger are connected in series in an eighth working fluid pipeline, and the two ports on the secondary side of the heat exchanger are connected in series in a seventh working fluid pipeline.

[0011] Furthermore, in this utility model, a dual-effect jet heat pump system is provided, wherein the throttling valve is installed on the seventh working fluid pipeline between the heat exchanger and the evaporator.

[0012] Furthermore, this utility model discloses a dual-effect jet heat pump system, wherein temperature sensors T1 and T2 are respectively provided at the two ports of the primary side of the generator, temperature sensors T3 and T4 are respectively provided at the two ports of the primary side of the evaporator, temperature sensors T5 and T6 are respectively provided at the two ports of the secondary side of the condenser, temperature sensor T7 and pressure sensor P1 are respectively provided at the main inlet of the first jet, and temperature sensor T8 and pressure sensor P2 are respectively provided at the outlet of the second jet.

[0013] Furthermore, in this utility model, a dual-effect jet heat pump system is provided, wherein the temperature sensors T1, T2, T3, T4, T5, T6, T7, T8, pressure sensor P1, and pressure sensor P2 are respectively connected to the control device.

[0014] Compared with existing technologies, this utility model of a dual-effect jet heat pump system has the following advantages: This utility model, by setting up a generator, a first ejector, a second ejector, a condenser, a liquid storage tank, and an evaporator, connects the two ports of the primary side of the generator to a heat source via heat exchange pipes to form a first heat exchange loop. The secondary side outlet of the generator is connected to the main flow inlet of the first ejector via a first working fluid pipe. The outlet of the first ejector is connected to the main flow inlet of the second ejector via a second working fluid pipe. The outlet of the second ejector is connected to the primary side inlet of the condenser via a third working fluid pipe. The third working fluid pipe is connected to the secondary flow inlet of the first ejector via a fourth working fluid pipe. The primary side outlet of the condenser... The system connects to the liquid storage tank via a fifth working fluid pipeline, and connects the two secondary ports of the condenser to the heating terminal via heat exchange pipelines to form a heating loop. The liquid storage tank is connected to the secondary inlet of the generator via a sixth working fluid pipeline, and the fifth working fluid pipeline is connected to the secondary inlet of the evaporator via a seventh working fluid pipeline. The secondary outlet of the evaporator is connected to the secondary inlet of the second ejector via an eighth working fluid pipeline, and the two primary ports of the evaporator are connected to the heat source via heat exchange pipelines to form a second heat exchange loop. A working fluid pump is installed on the sixth working fluid pipeline, and a throttling valve is installed on the seventh working fluid pipeline. For ease of control, control devices are also provided, connected to the first ejector, the second ejector, and the working fluid pump. This constitutes a simple, easy-to-operate, stable, safe, and practical dual-effect jet heat pump system. In practical applications, after the system starts, the fluids in the first heat exchange circuit, the second heat exchange circuit, the heating circuit, and the heat pump circuit circulate separately. The fluids in the first and second heat exchange circuits are high-temperature industrial wastewater or exhaust gas, referred to as high-temperature fluids. The fluid in the heating circuit is water or antifreeze, referred to as heating fluids. The fluid in the heat pump circuit is refrigerant. The high-temperature fluid transfers heat to the refrigerant in the generator and evaporator, respectively. The refrigerant then transfers heat to the heating fluid in the condenser, and the heating fluid transfers heat to the heating terminals. The high-pressure refrigerant saturated fluid entering the generator absorbs heat and transforms into high-pressure refrigerant vapor, which is then introduced into the first ejector. The refrigerant vapor from the first ejector outlet is mixed with the medium-pressure refrigerant vapor from the evaporator. The refrigerant vapor from the first ejector outlet is fed into the second ejector and mixed with the low-pressure refrigerant vapor from the evaporator. Part of the medium-pressure refrigerant vapor from the second ejector outlet enters the condenser, and part enters the first ejector. The medium-pressure refrigerant vapor entering the condenser releases heat and transforms into medium-pressure refrigerant saturated liquid. Part of the medium-pressure refrigerant saturated liquid enters the liquid receiver and is pumped by the working fluid pump to increase its pressure before entering the generator. Part of the liquid is throttled and depressurized by the throttling valve and becomes a refrigerant gas-liquid two-phase fluid before entering the evaporator. The refrigerant gas-liquid two-phase fluid entering the evaporator absorbs heat and transforms into low-pressure refrigerant vapor before entering the second ejector.This invention, by setting up two-stage ejectors in series (first ejector and second ejector), reduces the expansion ratio of a single ejector compared to existing jet heat pump systems, reduces internal losses of the ejector, realizes the cascade utilization of energy, improves ejector efficiency, and utilizes the first-effect ejector (first ejector) to guide the outlet fluid of the second-effect ejector (second ejector), realizing the recycling of heat and improving the overall COP of the system.

[0015] The following detailed description of a dual-effect jet heat pump system of the present invention, with reference to the accompanying drawings, illustrates the specific embodiments. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the first embodiment of a dual-effect jet heat pump system according to the present invention.

[0017] Figure 2 This is a schematic diagram of the second embodiment of a dual-effect jet heat pump system according to the present invention.

[0018] Figure 3 This is a schematic diagram of the third embodiment of a dual-effect jet heat pump system according to the present invention.

[0019] Figure 4 This is a schematic diagram of the fourth embodiment of a dual-effect jet heat pump system according to the present invention. Detailed Implementation

[0020] First, it should be noted that the directional terms such as up, down, left, right, front, and back mentioned in this utility model are only descriptions based on the accompanying drawings for ease of understanding, and are not intended to limit the technical solution or the scope of protection claimed in this utility model.

[0021] like Figure 1The present invention discloses a first embodiment of a dual-effect jet heat pump system, comprising a generator 1, a first ejector 2, a second ejector 3, a condenser 4, a liquid storage tank 5, and an evaporator 6. The primary side ports of the generator 1 are connected to a heat source via heat exchange pipes to form a first heat exchange loop. The secondary side outlet of the generator 1 is connected to the main flow inlet of the first ejector 2 via a first working fluid pipe 11. The outlet of the first ejector 2 is connected to the main flow inlet of the second ejector 3 via a second working fluid pipe 21. The outlet of the second ejector 3 is connected to the primary side inlet of the condenser 4 via a third working fluid pipe 31. The third working fluid pipe 31 is connected to the secondary flow inlet of the first ejector 2 via a fourth working fluid pipe 32. The primary side outlet of the condenser 4 is connected to... The condenser 4 is connected to the storage tank 5 via the fifth working fluid pipeline 41, and the two ports of the secondary side of the condenser 4 are connected to the heating terminal via heat exchange pipelines to form a heating circuit. The storage tank 5 is connected to the secondary inlet of the generator 1 via the sixth working fluid pipeline 51, and the fifth working fluid pipeline 41 is connected to the secondary inlet of the evaporator 6 via the seventh working fluid pipeline 42. The secondary outlet of the evaporator 6 is connected to the secondary inlet of the second ejector 3 via the eighth working fluid pipeline 61, and the two ports of the primary side of the evaporator 6 are connected to the heat source via heat exchange pipelines to form a second heat exchange circuit. The sixth working fluid pipeline 51 is equipped with a working fluid pump 7, and the seventh working fluid pipeline 42 is equipped with a throttling valve 8. For ease of control, control devices are also provided, which are connected to the first ejector 2, the second ejector 3, the working fluid pump 7, and the throttling valve 8 respectively.

[0022] The above configuration constitutes a simple, easy-to-operate, stable, safe, and practical dual-effect jet heat pump system. In practical applications, after the system is started, the fluids in the first heat exchange circuit, the second heat exchange circuit, the heating circuit, and the heat pump circuit circulate separately. The fluids in the first and second heat exchange circuits are high-temperature industrial wastewater or exhaust gas (referred to as high-temperature fluids), the fluid in the heating circuit is water or antifreeze (referred to as heating fluids), and the fluid in the heat pump circuit is refrigerant. The high-temperature fluid transfers heat to the refrigerant in generator 1 and evaporator 6, respectively. The refrigerant transfers heat to the heating fluid in condenser 4, and the heating fluid transfers heat to the heating terminal. The high-pressure refrigerant saturated fluid entering generator 1 absorbs heat and transforms into high-pressure refrigerant vapor. The high-pressure refrigerant vapor is introduced into the first ejector 2 and reacts with the refrigerant from the first ejector. The medium-pressure refrigerant vapor at the outlet of the second ejector 3 mixes with the refrigerant vapor at the outlet of the first ejector 2, which is then introduced into the second ejector 3 and mixed with the low-pressure refrigerant vapor from the evaporator 6. Part of the medium-pressure refrigerant vapor at the outlet of the second ejector 3 enters the condenser 4, and part of it enters the first ejector 2. The medium-pressure refrigerant vapor entering the condenser 4 releases heat and transforms into a medium-pressure refrigerant saturated liquid. Part of the medium-pressure refrigerant saturated liquid enters the liquid storage tank 5 and is pumped by the working fluid pump 7 to increase its pressure before entering the generator 1. The other part is throttled and depressurized by the throttling valve 8 and becomes a refrigerant gas-liquid two-phase fluid before entering the evaporator 6. The refrigerant gas-liquid two-phase fluid entering the evaporator 6 absorbs heat and transforms into a low-pressure refrigerant vapor, which is then introduced into the second ejector 3. This invention, by setting up a two-stage ejector system (first ejector 2 and second ejector 3) connected in series, reduces the expansion ratio of a single ejector, minimizes internal losses, achieves cascaded energy utilization, and improves ejector efficiency compared to existing jet-type heat pump systems. Furthermore, by using the first-effect ejector (first ejector 2) to guide the outlet fluid of the second-effect ejector (second ejector 3), heat recycling is achieved, improving the overall COP of the system. It should be noted that the heat pump circuit includes a primary heat pump circuit and a secondary heat pump circuit. The primary heat pump circuit is composed of generator 1, first ejector 2, second ejector 3, condenser 4, and liquid storage tank 5 connected sequentially. The secondary heat pump circuit is composed of second ejector 3, condenser 4, and evaporator 6 connected sequentially.

[0023] like Figure 2The second embodiment of the dual-effect jet heat pump system of this utility model differs from the first embodiment in that a heat exchanger 9 is added. The two ports of the primary side of the heat exchanger 9 are connected in series in the second working fluid pipeline 21, and the two ports of the secondary side of the heat exchanger 9 are connected in series in the sixth working fluid pipeline 51. This embodiment utilizes the heat exchanger 9 to preheat the refrigerant entering the generator 1 from the outlet of the first jet 2, reducing the heat exchange temperature difference in the generator 1 and minimizing irreversible losses. In practical applications, to ensure stable system operation, this utility model typically places the working fluid pump 7 on the sixth working fluid pipeline 51 between the heat exchanger 9 and the liquid storage tank 5.

[0024] like Figure 3 The third embodiment of the dual-effect jet heat pump system shown in this utility model differs from the first embodiment in that it also adds a heat exchanger 9. The two ports of the primary side of the heat exchanger 9 are connected in series in the third working fluid pipeline 31, and the two ports of the secondary side of the heat exchanger 9 are connected in series in the sixth working fluid pipeline 51. This embodiment utilizes the heat exchanger 9 to preheat the refrigerant entering the generator 1 from the outlet of the second jet 3, thus reducing the heat exchange temperature difference in the generator 1 and minimizing irreversible losses. In practical applications, to ensure stable system operation, this utility model typically places the working fluid pump 7 on the sixth working fluid pipeline 51 between the heat exchanger 9 and the liquid storage tank 5; and sets the connection point between the fourth working fluid pipeline 32 and the third working fluid pipeline 31 between the heat exchanger 9 and the condenser 4.

[0025] like Figure 4 The fourth embodiment of the dual-effect jet heat pump system shown in this utility model differs from the first embodiment in that it also adds a heat exchanger 9. The two ports of the primary side of the heat exchanger 9 are connected in series in the eighth working fluid pipeline 61, and the two ports of the secondary side of the heat exchanger 9 are connected in series in the seventh working fluid pipeline 42. A throttling valve 8 is installed on the seventh working fluid pipeline 42 between the heat exchanger 9 and the evaporator 6. This embodiment utilizes the heat exchanger 9 to exchange heat between the refrigerant at the outlet of the evaporator 6 and the refrigerant entering the throttling valve 8, thereby lowering the refrigerant temperature at the inlet of the throttling valve 8. This prevents vapor from entering the throttling valve and affecting normal operation, thus improving stability and reliability.

[0026] In practical applications, for ease of detection and control, temperature sensors T1 and T2 are respectively installed at the two ports on the primary side of generator 1, temperature sensors T3 and T4 are respectively installed at the two ports on the primary side of evaporator 6, temperature sensors T5 and T6 are respectively installed at the two ports on the secondary side of condenser 4, temperature sensor T7 and pressure sensor P1 are installed at the main flow inlet of the first ejector 2, and temperature sensor T8 and pressure sensor P2 are installed at the outlet of the second ejector 3. All of these sensors are connected to the control device.

[0027] The above embodiments are merely descriptions of preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Any modifications made by those skilled in the art based on the technical solution of the present utility model without departing from the design concept of the present utility model shall fall within the scope of protection defined by the claims of the present utility model.

Claims

1. A dual-effect jet heat pump system, characterized in that, The system includes a generator (1), a first ejector (2), a second ejector (3), a condenser (4), a liquid storage tank (5), and an evaporator (6). The two ports on the primary side of the generator (1) are connected to a heat source through heat exchange pipelines to form a first heat exchange circuit. The secondary side outlet of the generator (1) is connected to the main flow inlet of the first ejector (2) through a first working fluid pipeline (11). The outlet of the first ejector (2) is connected to the main flow inlet of the second ejector (3) through a second working fluid pipeline (21). The outlet of the second ejector (3) is connected to the primary side inlet of the condenser (4) through a third working fluid pipeline (31). The third working fluid pipeline (31) is connected to the secondary flow inlet of the first ejector (2) through a fourth working fluid pipeline (32). The primary side outlet of the condenser (4) is connected to the liquid storage tank (5) through a fifth working fluid pipeline (41). The two ports of the secondary side of the condenser (4) are connected to the heating terminal through heat exchange pipelines to form a heating circuit. The liquid storage tank (5) is connected to the secondary side inlet of the generator (1) through the sixth working fluid pipeline (51). The fifth working fluid pipeline (41) is connected to the secondary side inlet of the evaporator (6) through the seventh working fluid pipeline (42). The secondary side outlet of the evaporator (6) is connected to the secondary flow inlet of the second ejector (3) through the eighth working fluid pipeline (61). The two ports of the primary side of the evaporator (6) are connected to the heat source through heat exchange pipelines to form a second heat exchange circuit. The sixth working fluid pipeline (51) is equipped with a working fluid pump (7). The seventh working fluid pipeline (42) is equipped with a throttle valve (8). The system also includes a control device that is connected to the first ejector (2), the second ejector (3), the working fluid pump (7), and the throttle valve (8) respectively.

2. The dual-effect jet heat pump system according to claim 1, characterized in that, It also includes a heat exchanger (9), with the two primary ports of the heat exchanger (9) connected in series in the second working fluid pipeline (21), and the two secondary ports of the heat exchanger (9) connected in series in the sixth working fluid pipeline (51).

3. The dual-effect jet heat pump system according to claim 2, characterized in that, The working fluid pump (7) is installed on the sixth working fluid pipeline (51) between the heat exchanger (9) and the liquid storage tank (5).

4. The dual-effect jet heat pump system according to claim 1, characterized in that, It also includes a heat exchanger (9), with the two ports on the primary side of the heat exchanger (9) connected in series in the third working fluid pipeline (31), and the two ports on the secondary side of the heat exchanger (9) connected in series in the sixth working fluid pipeline (51).

5. The dual-effect jet heat pump system according to claim 4, characterized in that, The working fluid pump (7) is installed on the sixth working fluid pipeline (51) between the heat exchanger (9) and the liquid storage tank (5).

6. The dual-effect jet heat pump system according to claim 4, characterized in that, The connection point between the fourth working fluid pipeline (32) and the third working fluid pipeline (31) is located between the heat exchanger (9) and the condenser (4).

7. The dual-effect jet heat pump system according to claim 1, characterized in that, It also includes a heat exchanger (9), the two ports of the primary side of the heat exchanger (9) are connected in series in the eighth working fluid pipeline (61), and the two ports of the secondary side of the heat exchanger (9) are connected in series in the seventh working fluid pipeline (42).

8. The dual-effect jet heat pump system according to claim 7, characterized in that, The throttle valve (8) is installed on the seventh working fluid pipeline (42) between the heat exchanger (9) and the evaporator (6).

9. The dual-effect jet heat pump system according to claim 1, characterized in that, Temperature sensors T1 and T2 are provided on the two ports of the primary side of the generator (1), temperature sensors T3 and T4 are provided on the two ports of the primary side of the evaporator (6), temperature sensors T5 and T6 are provided on the two ports of the secondary side of the condenser (4), temperature sensor T7 and pressure sensor P1 are provided at the main inlet of the first ejector (2), and temperature sensor T8 and pressure sensor P2 are provided at the outlet of the second ejector (3).

10. The dual-effect jet heat pump system according to claim 9, characterized in that, Temperature sensors T1, T2, T3, T4, T5, T6, T7, T8, pressure sensor P1, and pressure sensor P2 are respectively connected to the control device.

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