Heat pump system capable of continuously discharging high-temperature hot water

Abstract

The utility model provides a heat pump system capable of continuously discharging high-temperature hot water, which comprises a first-stage heat pump system, a second-stage heat pump system and a water supply system, the first-stage heat pump system is provided with a first-stage continuous heat exchange device, and the first-stage continuous heat exchange device comprises a first-stage heat exchanger, a first one-way valve and a second one-way valve. A refrigerant inlet of the first one-way valve is communicated with a refrigerant outlet end of the first-stage heat pump system and a refrigerant outlet of the second one-way valve, a refrigerant outlet of the first one-way valve is communicated with a refrigerant inlet of the first-stage heat exchanger and a refrigerant inlet end of the first-stage heat pump system, and a refrigerant outlet of the first-stage heat exchanger is communicated with a refrigerant inlet of the second one-way valve. The superfluous refrigerants can be stored, all the refrigerants can participate in the heat exchange process, the refrigerants are fully utilized to release latent heat, meanwhile, the refrigerants of the gas flow and the liquid flow are further supercooled, the evaporation effect is improved, the operation stability is high, the system performance is improved, and it is guaranteed that high-temperature hot water is continuously discharged.

Description

Technical Field

[0001] The utility model relates to the technical field of heat pumps, in particular to a heat pump system capable of continuously producing high-temperature hot water. Background Art

[0002] The heat pump system used in the field of air energy heat pump obtains low-level thermal energy from the air, and provides high-level thermal energy that is higher or significantly higher than the material temperature through electrical energy to heat the material or other uses.

[0003] The air source heat pump system includes a heat pump unit, which is mainly composed of a compressor, a condensing heat exchanger, a throttling device, and an evaporating heat exchanger connected in sequence through a working fluid pipeline to form a circulation loop.

[0004] At present, many air source heat pumps operate at low temperatures. Due to the large temperature difference, the temperature of the hot water generated is not too high, especially in the north where the outdoor temperature is -30°C. The existing heat pumps can only reach around 50°C, absorbing heat from the environment and then raising the water temperature to 50°C. The temperature difference in the middle is 80°C, and the existing heat pumps cannot meet the requirements.

[0005] Therefore, in order to increase the temperature of hot water generated by heat pumps, electricity, steam, and gas are generally used as secondary heat sources on the market. However, this method has low energy utilization, high energy consumption, complex system structure, and high manufacturing cost. At the same time, during operation, high-temperature and high-pressure refrigerant steam passes through the heat exchanger for heat exchange, and the refrigerant releases latent heat when condensing, heating the water in the heat exchanger to produce high-temperature hot water output. During this period, the condensed liquid refrigerant passes through the throttle and enters the evaporator. At this time, there is still high-temperature non-condensable refrigerant output to the evaporator, which reduces the evaporation effect of the evaporator and causes the compressor to be unable to achieve continuous compression work, unstable operation, and unable to continuously output high-temperature hot water. Utility Model Content

[0006] The utility model aims to solve the shortcomings in the prior art and proposes a heat pump system which can continuously produce high-temperature hot water.

[0007] The invention objective of the utility model is achieved as follows: a heat pump system capable of continuously outputting high-temperature hot water, comprising a primary heat pump system, a secondary heat pump system, and a water supply system, wherein the primary heat pump system is provided with a primary continuous heat exchange device, the primary continuous heat exchange device comprising a primary heat exchanger, a first one-way valve, and a second one-way valve, the refrigerant inlet of the first one-way valve being respectively connected to the refrigerant outlet end of the primary heat pump system and the refrigerant outlet of the second one-way valve, the refrigerant outlet of the first one-way valve being respectively connected to the refrigerant inlet of the primary heat exchanger and the refrigerant inlet end of the primary heat pump system, the refrigerant outlet of the primary heat exchanger being connected to the refrigerant inlet of the second one-way valve, the secondary heat pump system comprising a secondary water-side heat exchanger, the water supply system comprising an inlet pipeline and an outlet pipeline, the inlet pipeline being respectively connected to the water inlet of the primary heat exchanger and the water inlet of the secondary water-side heat exchanger, the outlet pipeline being respectively connected to the water outlet of the primary heat exchanger and the water outlet of the secondary water-side heat exchanger.

[0008] According to the above optimization, the primary heat exchanger is configured as a heat exchanger with a balancer.

[0009] According to the above optimization, an intermediate heat exchanger is provided between the primary heat pump system and the secondary heat pump system, and the first refrigerant inlet and the first refrigerant outlet of the intermediate heat exchanger are respectively connected to the refrigerant outlet end of the primary heat pump system and the refrigerant inlet of the first one-way valve, and the second refrigerant inlet and the second refrigerant outlet of the intermediate heat exchanger are respectively connected to the refrigerant outlet of the secondary water side heat exchanger and the refrigerant inlet end of the secondary heat pump system.

[0010] According to the above optimization, the first-stage heat pump system includes a first-stage compressor, a four-way valve, a first-stage throttle, a fin-type heat exchanger, and a separator. The first-stage compressor, four-way valve, intermediate heat exchanger, first one-way valve, first-stage heat exchanger, second one-way valve, first-stage throttle, fin-type heat exchanger, and separator are connected through a refrigerant pipeline to form a first-stage heat pump system with refrigerant circulation.

[0011] According to the above optimization, the first-stage compressor is set as a DC variable frequency compressor.

[0012] According to the above optimization, the two-stage heat pump system also includes a two-stage compressor and a two-stage throttle. The two-stage compressor, the two-stage water-side heat exchanger, the two-stage throttle and the intermediate heat exchanger are connected by a refrigerant pipe to form a two-stage heat pump system with refrigerant circulation.

[0013] According to the above optimization, the two-stage compressor is set as a fixed-frequency compressor.

[0014] The advantages of the utility model are:

[0015] 1) By adding a first-stage continuous heat exchange device, excess refrigerant can be stored, and all refrigerants can be involved in the heat exchange process, so that the high-temperature refrigerant of the first-stage heat pump system can exchange heat with the water of the first-stage heat exchanger, making full use of the latent heat released by the refrigerant, and at the same time further supercooling the refrigerant of the gas-liquid reflux, thereby improving the evaporation effect, high operating stability, improving system performance, and ensuring continuous high-temperature hot water.

[0016] 2) Under the action of the intermediate heat exchanger, the low-grade heat of the first-stage heat pump system is used as production heat and transferred to the second-stage heat pump system. At the same time, the energy efficiency of the first-stage heat pump system can be improved. Under the cascade effect of the two-stage heat pump system, the heating energy efficiency is greatly improved, and high-temperature hot water can be continuously produced in a low-temperature environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a working principle diagram of a preferred embodiment of the utility model. DETAILED DESCRIPTION

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

[0019] According to the attached Figure 1 As shown, the heat pump system of the utility model that can continuously output high-temperature hot water includes a primary heat pump system, a secondary heat pump system, and a water supply system, wherein the primary heat pump system is provided with a primary continuous heat exchange device. The primary continuous heat exchange device includes a primary heat exchanger 4, a first one-way valve 5, and a second one-way valve 6, wherein the refrigerant inlet of the first one-way valve 5 is respectively connected to the refrigerant outlet end of the primary heat pump system and the refrigerant outlet of the second one-way valve 6, the refrigerant outlet of the first one-way valve 5 is respectively connected to the refrigerant inlet of the primary heat exchanger 4 and the refrigerant inlet end of the primary heat pump system, and the refrigerant outlet of the primary heat exchanger 4 is connected to the refrigerant inlet of the second one-way valve 6. The secondary heat pump system includes a secondary water-side heat exchanger 11, and the water supply system includes an inlet pipe 13 and an outlet pipe 14. The inlet pipe 13 is respectively connected to the water inlet of the primary heat exchanger 4 and the water inlet of the secondary water-side heat exchanger 11, and the outlet pipe 14 is respectively connected to the water outlet of the primary heat exchanger 4 and the water outlet of the secondary water-side heat exchanger 11.

[0020] During operation, due to the structural coordination of the first one-way valve 5, the primary heat exchanger 4 and the second one-way valve 6, the high-pressure and high-temperature refrigerant gas compressed by the primary heat pump system can be divided into two flow branches; that is, part of the high-pressure and high-temperature refrigerant gas is transported to the primary heat exchanger 4 through the first one-way valve 5 and heat-exchanged with the water of the primary heat exchanger 4 to obtain high-temperature hot water, and then the low-temperature refrigerant flows back to the first one-way valve 5 through the second one-way valve 6, so that part of the condensed refrigerant can be transported to the primary heat pump system through the first one-way valve 5 for evaporation, and the other part of the high-temperature non-condensable refrigerant is transported back to the first heat exchanger through the first one-way valve 5 for continued heat exchange. In this way, excess refrigerant can be stored, and all refrigerants can participate in the heat exchange process, fully utilizing the refrigerant energy, achieving continuous output of high-temperature hot water, and further supercooling the refrigerant to improve the evaporation effect, improve the system operation stability, and ensure system performance.

[0021] In practical applications, the primary heat exchanger 4 is configured as a heat exchanger with a balancer. The use of a heat exchanger with a balancer can effectively control the balance of refrigerant energy, improve heat exchange efficiency, and enhance system performance.

[0022] Reference Figure 1 As shown, in further detail, an intermediate heat exchanger 3 is provided between the primary heat pump system and the secondary heat pump system, and the first refrigerant inlet and the first refrigerant outlet of the intermediate heat exchanger 3 are respectively connected to the refrigerant outlet end of the primary heat pump system and the refrigerant inlet of the first one-way valve 5, and the second refrigerant inlet and the second refrigerant outlet of the intermediate heat exchanger 3 are respectively connected to the refrigerant outlet of the secondary water side heat exchanger 11 and the refrigerant inlet end of the secondary heat pump system.

[0023] The primary heat pump system includes a primary compressor 1, a four-way valve 2, a primary throttle 7, a finned heat exchanger 8, and a separator 9. The primary compressor 1, the four-way valve 2, the intermediate heat exchanger 3, the first one-way valve 5, the primary heat exchanger 4, the second one-way valve 6, the primary throttle 7, the finned heat exchanger 8, and the separator 9 are connected through a refrigerant pipeline to form a primary heat pump system with refrigerant circulation. The secondary heat pump system also includes a secondary compressor 10 and a secondary throttle 12. The secondary compressor 10, the secondary water-side heat exchanger 11, the secondary throttle 12, and the intermediate heat exchanger 3 are connected through a refrigerant pipe to form a secondary heat pump system with refrigerant circulation.

[0024] Under the action of the intermediate heat exchanger 3, the low-grade heat of the primary heat pump system is used as production heat and transferred to the secondary heat pump system, which can improve the energy efficiency of the primary heat pump system. Under the cascade effect of the two-stage heat pump system, the heating energy efficiency is greatly improved, and high-temperature hot water can be continuously produced in a low-temperature environment.

[0025] It is worth noting that the first-stage compressor 1 of this structure is set as a DC variable frequency compressor, and the second-stage compressor 10 is set as a fixed frequency compressor. The heating capacity in the low-temperature environment is further increased, the energy efficiency ratio in the low-temperature environment is effectively improved, and normal operation in the low-temperature environment is ensured.

[0026] The above-mentioned specific embodiments are only specific implementation methods with better effects of the utility model. Any structure that is the same or equivalent to the heat pump system of the utility model that can continuously produce high-temperature hot water is within the protection scope of the utility model.

Claims

1. A heat pump system capable of continuously producing high-temperature hot water, comprising a primary heat pump system, a secondary heat pump system, and a water supply system, characterized in that: The primary heat pump system is provided with a primary continuous heat exchange device, which comprises a primary heat exchanger (4), a first one-way valve (5), and a second one-way valve (6). The refrigerant inlet of the first one-way valve (5) is respectively connected to the refrigerant outlet of the primary heat pump system and the refrigerant outlet of the second one-way valve (6). The refrigerant outlet of the first one-way valve (5) is respectively connected to the refrigerant inlet of the primary heat exchanger (4) and the refrigerant inlet of the primary heat pump system. The refrigerant outlet of the first heat exchanger (4) is connected to the refrigerant inlet of the second one-way valve (6), the second-stage heat pump system includes a second-stage water-side heat exchanger (11), and the water supply system includes a water inlet pipeline (13) and a water outlet pipeline (14), the water inlet pipeline (13) is respectively connected to the water inlet of the first heat exchanger (4) and the water inlet of the second-stage water-side heat exchanger (11), and the water outlet pipeline (14) is respectively connected to the water outlet of the first heat exchanger (4) and the water outlet of the second-stage water-side heat exchanger (11).

2. The heat pump system capable of continuously producing high-temperature hot water according to claim 1, characterized in that: The primary heat exchanger (4) is configured as a heat exchanger with a balancer.

3. The heat pump system capable of continuously producing high-temperature hot water according to claim 1, characterized in that: An intermediate heat exchanger (3) is provided between the primary heat pump system and the secondary heat pump system. The first refrigerant inlet and the first refrigerant outlet of the intermediate heat exchanger (3) are respectively connected to the refrigerant outlet of the primary heat pump system and the refrigerant inlet of the first one-way valve (5). The second refrigerant inlet and the second refrigerant outlet of the intermediate heat exchanger (3) are respectively connected to the refrigerant outlet of the secondary water-side heat exchanger (11) and the refrigerant inlet of the secondary heat pump system.

4. The heat pump system capable of continuously producing high-temperature hot water according to claim 3, characterized in that: The primary heat pump system comprises a primary compressor (1), a four-way valve (2), a primary throttle (7), a finned heat exchanger (8), and a separator (9). The primary compressor (1), the four-way valve (2), the intermediate heat exchanger (3), the first non-return valve (5), the primary heat exchanger (4), the second non-return valve (6), the primary throttle (7), the finned heat exchanger (8), and the separator (9) are connected via a refrigerant pipeline to form a primary heat pump system in which a refrigerant circulates.

5. The heat pump system capable of continuously producing high-temperature hot water according to claim 4, characterized in that: The first-stage compressor (1) is configured as a DC variable frequency compressor.

6. The heat pump system capable of continuously producing high-temperature hot water according to claim 3, characterized in that: The two-stage heat pump system also includes a two-stage compressor (10) and a two-stage throttle (12). The two-stage compressor (10), the two-stage water-side heat exchanger (11), the two-stage throttle (12), and the intermediate heat exchanger (3) are connected via a refrigerant pipe to form a two-stage heat pump system in which the refrigerant circulates.

7. The heat pump system capable of continuously producing high-temperature hot water according to claim 6, characterized in that: The secondary compressor (10) is configured as a fixed-frequency compressor.

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