Online defrosting high-temperature steam heat pump system

Abstract

The utility model discloses an on-line defrosting high temperature steam heat pump system, which belongs to the technical field of air source heat pumps and comprises a primary heat pump system, a secondary heat pump system and a steam generator, the primary heat pump system and the secondary heat pump system are connected in series to provide heat energy for the steam generator, and the primary heat pump system further comprises a defrosting pipeline. When the fin heat exchanger needs to be defrosted, the control system controls the second-stage heat pump system to stop working and controls the four-way valve to enable refrigerants to enter the fin heat exchanger from an outlet of the first-stage compressor, the refrigerants in the defrosting pipeline absorb heat energy of the steam generator through the heat exchanger, and the refrigerants are condensed into a liquid state in the fin heat exchanger to achieve heat release. The function of heating and defrosting the fin type heat exchanger is achieved, and online defrosting of the fin type heat exchanger is achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to air source heat pump technical field, concretely relates to a high temperature steam heat pump system of online defrosting. BACKGROUND

[0002] Air source heat pump technology, the heating principle is completely different with traditional solar water heater, utilizes a small amount of electric energy as power, with refrigerant as carrier, based on the physical principle of liquefied heat release, vaporization heat absorption, absorbs the low-grade heat energy in air and converts into available high-grade heat energy, then releases the high-grade heat energy to the medium needing heating, realizes heating. But the existing steam heat pump system can not realize the online defrosting function of fin heat exchanger well. CONTENT OF THE UTILITY MODEL

[0003] In order to realize the online defrosting of fin heat exchanger, the technical scheme of the utility model online defrosting high temperature steam heat pump system is designed by the inventor, including: primary heat pump system, secondary heat pump system, second heat exchanger and steam generator, the primary heat pump system and the secondary heat pump system are connected in series through the second heat exchanger to provide heat energy to the steam generator, the primary heat pump system also includes defrosting pipeline, and the refrigerant in the defrosting pipeline absorbs the heat energy of the medium in the steam generator through the heat exchanger. When the fin heat exchanger of the primary heat pump system needs to be defrosted, the control system stops the secondary heat pump system from working, the four-way valve of the primary heat pump system is reversed to make the primary heat pump system change from heating mode to defrosting mode, the refrigerant in the defrosting pipeline absorbs the heat energy of the steam generator through the heat exchanger, and the refrigerant is condensed into liquid in the fin heat exchanger from high-temperature high-pressure gas, heat is released in the liquefaction process, and then the fin heat exchanger of the primary heat pump system is heated.

[0004] In the scheme, in the heating mode: the refrigerant of the primary heat pump system passes through the pipeline from the primary compressor, the four-way valve, the first heat exchanger, the throttling device, the fin heat exchanger, the four-way valve and returns to the primary compressor, and the defrosting pipeline; the refrigerant of the secondary heat pump system passes through the pipeline from the secondary compressor, the second heat exchanger, the throttling device and the first heat exchanger and returns to the secondary compressor; the water in the steam generator absorbs the heat energy generated by the primary heat pump system and the secondary heat pump system in series in the second heat exchanger through the first water pump and returns to the steam generator, so that the water in the steam generator is heated, and steam can be generated when the water temperature reaches about 120 DEG C. The control system stops the secondary heat pump system from working, the four-way valve of the primary heat pump system is reversed, the primary heat pump system is switched to the defrosting mode, the fin heat exchanger of the primary heat pump system is heated, and defrosting is completed. After defrosting is completed, the four-way valve of the primary heat pump system is reversed again, the control system starts the secondary heat pump system, and the whole system is switched to the primary heat pump system and the secondary heat pump system in series to heat the water in the steam generator.

[0005] In the scheme, a third heat exchanger is further included, the defrosting pipe is a part of the refrigerant pipe in the first heat pump system, and the defrosting pipe absorbs the heat energy of the hot water in the steam generator in the third heat exchanger. In the heating mode, the third heat exchanger is only a passage, and the defrosting pipe does not function to absorb heat.

[0006] In the scheme, the defrosting pipe absorbs the heat energy of the medium in the steam generator in the second heat exchanger. The defrosting pipe is arranged in the second heat exchanger. In the heating mode, the second heat exchanger transmits the heat energy to the steam generator.

[0007] In the scheme, a second water pump is further included, the water in the steam generator returns to the steam generator through the third heat exchanger under the action of the second water pump, when defrosting, the hot water in the steam generator flows through the third heat exchanger, and the defrosting pipe absorbs the heat energy of the medium in the steam generator in the third heat exchanger.

[0008] In the scheme, a three-way valve is further included, the first water pump, the third heat exchanger inlet and the second heat exchanger are respectively connected with the pipeline of the three-way valve, and the third heat exchanger outlet is connected with the pipeline of the steam generator. The application of the three-way valve enables one water pump to switch between the heat supply of the steam generator to the third heat exchanger and the heat absorption of the steam generator from the second heat exchanger.

[0009] In the scheme, a pressure regulating valve is arranged between the three-way valve and the third heat exchanger. The pressure regulating valve adjusts the flow of the hot water into the third heat exchanger, so as to adjust the heat energy supplied to the third heat exchanger.

[0010] In the scheme, a three-way valve is further included, the four-way valve, one end of the defrosting pipe and the other end of the defrosting pipe are respectively connected with the pipeline of the three-way valve. When defrosting, the control system stops the operation of the second heat pump system, the four-way valve of the first heat pump system is reversed to enable the first heat pump system to change from the heating mode to the defrosting mode, the three-way valve is reversed, and under the action of the first water pump, the hot water in the steam generator flows through the second heat exchanger, the defrosting pipe in the second heat exchanger absorbs the heat of the hot water, the high-temperature and high-pressure gas discharged by the first compressor is condensed into liquid in the fin heat exchanger, the heat release of the liquidization realizes the heating of the fin heat exchanger to achieve the defrosting effect, and the rear refrigerant medium absorbs the heat of the hot water in the steam generator in the second heat exchanger, the refrigerant medium changes from liquid to gas to absorb heat, and returns to the first compressor through the three-way valve.

[0011] In the scheme, a temperature measuring device is further included, the temperature measuring device detects the temperature of the surface of the fin heat exchanger, and the temperature measuring device, the first compressor, the second compressor, the four-way valve, the fan of the fin heat exchanger and the first water pump are electrically connected with the control system.

[0012] In the scheme of the application, the steam generator is provided with a water supplement pipe, a steam discharge port and a safety valve, the water supplement pipe is installed with a valve, and the steam discharge port is installed with a pressure valve. The steam generator is a pressure container to ensure safety, water in the steam generator is heated in circulation, and after the water temperature is heated (for example, reaches 90-120 DEG C), the water is expanded and has water vapor, the steam discharge port is provided with a certain opening pressure, and when the pressure in the steam generator exceeds the opening pressure, the steam generator can discharge steam. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 The steam generation flow chart for the system scheme 1 of the utility model is shown in the figure.

[0014] Figure 2 The defrosting flow chart for the system scheme 1 of the utility model is shown in the figure.

[0015] Figure 3 The steam generation flow chart for the system scheme 2 of the utility model is shown in the figure.

[0016] Figure 4 The defrosting flow chart for the system scheme 2 of the utility model is shown in the figure.

[0017] Figure 5 The steam generation flow chart for the system scheme 3 of the utility model is shown in the figure.

[0018] Figure 6 The defrosting flow chart for the system scheme 3 of the utility model is shown in the figure.

[0019] In the figure: 1, a primary compressor; 2, a fin heat exchanger; 3, a secondary compressor; 4, a second heat exchanger; 5, a steam generator; 6, a first heat exchanger; 7, a first water pump; 8, a throttling device; 9, a four-way valve; 10, a third heat exchanger; 11, a second water pump; 12, a three-way valve; 13, a defrosting pipeline; 14, a water supplement pipe; 15, a pressure regulating valve. DETAILED DESCRIPTION

[0020] Explanation:

[0021] 1, the arrow direction in the figure indicates the flow direction of the medium. The throttling device 8 is selected from an electronic expansion valve, a capillary or a thermal expansion valve. The refrigerant medium in the pipeline exchanges and transfers heat with the water in the second heat exchanger 4 and the third heat exchanger 10.

[0022] 2. The steam generator 5 is a pressure vessel. Under the action of the first water pump 7, the water in the steam generator 5 flows to the second heat exchanger 4 and is circulated and heated. After the water temperature is heated (e.g., reaching 90-120℃), it expands to a certain extent and produces steam. The pressure valve at the steam discharge port is set with a certain opening pressure. When the pressure inside the steam generator exceeds the set opening pressure, the steam generator can discharge steam to achieve steam generation; when the pressure inside the steam generator is lower than the set opening pressure, steam will not be discharged. The water supply pipe 14 is used to supply water to the steam generator 5.

[0023] Example 1

[0024] like Figure 1 , 2 The high-temperature steam heat pump system for online defrosting shown includes a primary heat pump system, a secondary heat pump system, and a steam generator 5. The primary heat pump system and the secondary heat pump system are connected in series through a first heat exchanger 6, and the heat energy is supplied to the steam generator 5 through a second heat exchanger 4 to generate steam.

[0025] Primary heat pump system: The four-way valve 9 is connected to the outlet of the primary compressor 1, the inlet of the primary compressor 1, the finned heat exchanger 2, and the first heat exchanger 6 respectively. A throttling device 8 is installed on the pipe connecting the finned heat exchanger 2 and the first heat exchanger 6. There is a defrosting pipe 13 on the pipe connecting the four-way valve 9 and the first heat exchanger 6.

[0026] Two-stage heat pump system: The pipe at the outlet of the two-stage compressor 3 is connected to the second heat exchanger 4, and the inlet of the two-stage compressor 3 is connected to the first heat exchanger 6. A throttling device 8 is installed between the first heat exchanger 6 and the second heat exchanger 4.

[0027] The steam generator 5 is connected to the inlet pipe of the first water pump 7, the outlet of the first water pump 7 is connected to the pipe of the second heat exchanger 4, and the second heat exchanger 4 is also connected to the pipe of the steam generator 5.

[0028] The steam generator 5 is also connected to the inlet pipe of the second water pump 11, and the two ends of the third heat exchanger 10 are respectively connected to the outlet of the second water pump 11 and the steam generator 5 pipe. The defrost pipe 13 passes through the third heat exchanger 10.

[0029] The finned heat exchanger 2 is equipped with a temperature measuring device on its surface. The temperature measuring device, the primary compressor 1, the secondary compressor 3, the four-way valve 9, the fan of the finned heat exchanger 2, the first water pump 7, and the second water pump 11 are all electrically connected to the control system. The steam generator 5 is equipped with a water supply pipe 14, a steam discharge port, and a safety valve. The water supply pipe 14 is fitted with a valve, and the steam discharge port is fitted with a pressure valve.

[0030] The second water pump 11 has smaller rated flow and outlet pressure than the first water pump 7, and the system has smaller installed energy consumption and saves energy. The smaller outlet pressure makes the pipe pressure slightly lower, and the system is not prone to leakage.

[0031] As Figure 1 Heating preparation steam mode

[0032] Under the action of the control system, the outlet of the first-stage compressor 1 is in communication with the pipe of the first heat exchanger 6, the inlet of the first-stage compressor 1 is in communication with the pipe of the fin heat exchanger 2, the first-stage compressor 1, the second-stage compressor 3 and the fan of the fin heat exchanger 2 work, and the first water pump 7 works.

[0033] The first-stage compressor 1 works to compress the refrigerant medium in the pipe into a gaseous state with high temperature and high pressure, the refrigerant medium is condensed into a liquid state in the first heat exchanger 6, the liquidization releases heat, and then the pressure is reduced through the throttling device, and the refrigerant medium is evaporated into a gaseous state in the fin heat exchanger 2, the evaporation absorbs heat from the environment, and the gaseous state with low temperature and low pressure returns to the first-stage compressor 1.

[0034] The second-stage compressor 3 works to compress the refrigerant medium in the pipe into a gaseous state with high temperature and high pressure, the refrigerant medium is condensed into a liquid state in the second heat exchanger 4, the liquidization releases heat, and then the pressure is reduced through the throttling device, and the refrigerant medium is evaporated into a gaseous state in the first heat exchanger 6, the evaporation absorbs heat generated by the first-stage heat pump system, and the gaseous state with low temperature and low pressure enters the second-stage compressor 3.

[0035] The first water pump 7 works to pump the water in the steam generator 5 to the second heat exchanger 4 through the pipe, the water absorbs the heat released by the liquidization of the refrigerant medium of the second-stage heat pump system in the second heat exchanger 4 to heat the water, and then the water returns to the steam generator 5 through the pipe to complete the heating of the water in the steam generator 5 to about 120℃ to generate steam.

[0036] As Figure 2 Defrosting mode

[0037] Under the action of the control system, the outlet of the first-stage compressor 1 is in communication with the pipe of the fin heat exchanger 2, the inlet of the first-stage compressor 1 is in communication with the pipe of the first heat exchanger 6, the first-stage compressor 1 and the second water pump 11 work, and the second-stage compressor 3, the fan of the fin heat exchanger 2 and the first water pump 7 stop working.

[0038] The primary compressor 1 works to compress the refrigerant medium in the pipeline into a high-temperature and high-pressure gas state, and the refrigerant medium is condensed into a liquid state in the fin heat exchanger 2, and the heat released in the liquefaction process is used to heat the fin heat exchanger 2 to defrost, and then the pressure is reduced through the throttling device. Since the secondary compressor 3 stops working, the first heat exchanger 6 is only a passage. The second water pump 11 works to pump the water in the steam generator 5 to the third heat exchanger 10 to provide heat energy. The refrigerant medium absorbs the heat of the hot water pumped from the steam generator 5 in the third heat exchanger 10, and then vaporizes into a gas state, becoming a low-temperature and low-pressure gas into the primary compressor 1.

[0039] Embodiment 2

[0040] As shown in the high-temperature steam heat pump system for online defrosting, the system comprises a primary heat pump system, a secondary heat pump system, and a steam generator 5. The primary heat pump system and the secondary heat pump system are connected in series through a first heat exchanger 6, and heat energy is provided to the steam generator 5 through a second heat exchanger 4 to generate steam. Figure 3 4 The primary heat pump system: a four-way valve 9 is connected to the outlet of the primary compressor 1, the inlet of the primary compressor 1, the fin heat exchanger 2, and the first heat exchanger 6 pipeline respectively. A throttling device 8 is arranged on the pipeline connecting the fin heat exchanger 2 and the first heat exchanger 6. A defrosting pipeline 13 is arranged on the pipeline connecting the four-way valve 9 and the first heat exchanger 6.

[0041] The secondary heat pump system: the pipeline connecting the outlet of the secondary compressor 3 is connected to the second heat exchanger 4, and the inlet of the secondary compressor 3 is connected to the first heat exchanger 6. A throttling device 8 is arranged between the first heat exchanger 6 and the second heat exchanger 4.

[0042] The steam generator 5 is connected to the inlet pipeline of the first water pump 7. The three ports of the three-way valve 12 are respectively connected to the outlet of the first water pump 7, the second heat exchanger 4, and the third heat exchanger 10 pipeline. A pressure regulating valve 15 is further arranged between the three-way valve 12 and the third heat exchanger 10. The second heat exchanger 4 is connected to the pipeline of the steam generator 5. The third heat exchanger 10 is also connected to the pipeline of the steam generator 5. The defrosting pipeline 13 penetrates through the third heat exchanger 10.

[0043] The fin heat exchanger 2 is provided with a temperature measuring device for detecting the temperature. The temperature measuring device, the primary compressor 1, the secondary compressor 3, the four-way valve 9, the three-way valve 12, the fan of the fin heat exchanger 2, and the first water pump 7 are electrically connected to the control system. The steam generator 5 is provided with a water supply pipe 14, a steam discharge port, and a safety valve. The water supply pipe 14 is provided with a valve. The steam discharge port is provided with a pressure valve.

[0044]

[0045] ​​The water required in defrosting is less, the first water pump 7 is controlled by frequency conversion, and in the defrosting mode, it runs at low frequency. The pressure regulating valve 15 is arranged to adjust the water pressure entering the third heat exchanger 10.

[0046] As Figure 3 Heating preparation steam mode

[0047] The four-way valve 9 is connected with the outlet of the first compressor 1 and the first heat exchanger 6 under the action of the control system, and the inlet of the first compressor 1 is connected with the fin heat exchanger 2, the first compressor 1, the second compressor 3 and the fan of the fin heat exchanger 2 work, and the first water pump 7 works. The three-way valve 12 is connected with the second heat exchanger 4 under the action of the control system.

[0048] The first compressor 1 works to compress the refrigerant medium in the pipeline into a high-temperature and high-pressure gas state, and the refrigerant medium is condensed into a liquid state in the first heat exchanger 6, and the liquid heat is released, and then the pressure is reduced by the throttling device, and evaporated into a gas state in the fin heat exchanger 2, and the vaporization absorbs the heat from the environment, and returns to the first compressor 1 in a low-temperature and low-pressure gas state.

[0049] The second compressor 3 works to compress the refrigerant medium in the pipeline into a high-temperature and high-pressure gas state, and the refrigerant medium is condensed into a liquid state in the second heat exchanger 4, and the liquid heat is released, and then the pressure is reduced by the throttling device, and evaporated into a gas state in the first heat exchanger 6, and the vaporization absorbs the heat generated by the first heat pump system, and enters the second compressor 3 in a low-temperature and low-pressure gas state.

[0050] The first water pump 7 works to pump the water in the steam generator 5 to the second heat exchanger 4 through the pipeline, the water absorbs the heat released by the liquefaction of the refrigerant medium of the second heat pump system in the second heat exchanger 4, realizes the heating of the water, and then returns to the steam generator 5 through the pipeline, so as to complete the heating of the water in the steam generator 5 to about 120℃ to generate steam.

[0051] As Figure 4 Defrosting mode

[0052] The four-way valve 9 is connected with the outlet of the first compressor 1 and the fin heat exchanger 2 under the action of the control system, and the inlet of the first compressor 1 is connected with the first heat exchanger 6, the first compressor 1 and the first water pump 7 work, and the second compressor 3 and the fan of the fin heat exchanger 2 stop working. The three-way valve 12 is connected with the third heat exchanger 10 under the action of the control system.

[0053] The primary compressor 1 works to compress the refrigerant medium in the pipeline into a high-temperature and high-pressure gas state, and the refrigerant medium is condensed into a liquid state in the fin heat exchanger 2, and the heat released in the liquefaction process is used to heat the fin heat exchanger 2 to defrost, and then the pressure is reduced through the throttling device. Since the secondary compressor 3 stops working, the first heat exchanger 6 is only a passage. The first water pump 7 works, and the three-way valve 12 makes the first water pump 7 communicate with the third heat exchanger 10 to pump the water in the steam generator 5 to the third heat exchanger 10 to provide heat energy. The refrigerant medium absorbs the heat of the hot water pumped from the steam generator 5 in the third heat exchanger 10, and then vaporizes into a gas state to become a low-temperature and low-pressure gas into the primary compressor 1.

[0054] Embodiment 3

[0055] As shown in the high-temperature steam heat pump system for online defrosting, Figure 5 , 6 The high-temperature steam heat pump system for online defrosting includes a primary heat pump system, a secondary heat pump system, and a steam generator 5. The primary heat pump system and the secondary heat pump system are connected in series through a first heat exchanger 6, and heat energy is provided to the steam generator 5 through a second heat exchanger 4 to generate steam.

[0056] The primary heat pump system: A four-way valve 9 is connected to the outlet of a primary compressor 1, the inlet of the primary compressor 1, a fin heat exchanger 2, and a three-way valve 12, respectively. A throttling device 8 is arranged on the pipeline connecting the fin heat exchanger 2 and the first heat exchanger 6. The other end of the first heat exchanger 6 is connected to a defrosting pipeline 13 (as shown in Figure 5 The upper end) arranged in the second heat exchanger 4 of the secondary heat pump system. The three-way valve 12 is connected to the four-way valve 9, one end of the defrosting pipeline 13, and the other end of the defrosting pipeline 13, respectively.

[0057] The secondary heat pump system: The pipeline connecting the outlet of a secondary compressor 3 is connected to a second heat exchanger 4. The inlet of the secondary compressor 3 is connected to the first heat exchanger 6. The throttling device 8 is arranged between the first heat exchanger 6 and the second heat exchanger 4.

[0058] The steam generator 5 is connected to the inlet pipeline of a first water pump 7. The outlet of the first water pump 7 is connected to the pipeline of the second heat exchanger 4. The second heat exchanger 4 is further connected to the steam generator 5 through a backflow pipeline. The defrosting pipeline 13 penetrates the second heat exchanger 4.

[0059] A temperature measuring device for detecting the temperature of the surface of the fin heat exchanger 2 is arranged. The temperature measuring device, the primary compressor 1, the secondary compressor 3, the four-way valve 9, the three-way valve 12, the fan of the fin heat exchanger 2, and the first water pump 7 are electrically connected to a control system. The steam generator 5 is provided with a water supply pipe 14, a steam discharge port, and a safety valve. The water supply pipe 14 is provided with a valve. The steam discharge port is provided with a pressure valve.

[0060] The first water pump 7 is controlled by a fixed frequency or variable frequency, and the defrosting pipe 13 is located in the second heat exchanger 4. Compared with embodiment 1 or 2, the system saves one heat exchanger, resulting in lower cost and fewer maintenance points.

[0061] like Figure 5 Heating to prepare steam mode

[0062] Under the control system, the four-way valve 9 connects the outlet of the primary compressor 1 to the three-way valve 12 and the inlet of the primary compressor 1 to the finned heat exchanger 2. Under the control system, the three-way valve 12 connects the outlet of the primary compressor 1 to the first heat exchanger 6. The fans of the primary compressor 1, the secondary compressor 3, and the finned heat exchanger 2 operate; the first water pump 7 operates.

[0063] When the first-stage compressor 1 is working, it compresses the refrigerant in the pipeline into a high-temperature, high-pressure gaseous state. The refrigerant enters the first heat exchanger 6 through the four-way valve 9 and the three-way valve 12 and condenses into a liquid state. The liquefaction releases heat, and then the pressure is reduced by the throttling device. It evaporates into a gaseous state in the finned heat exchanger 2, absorbs heat from the environment, and returns to the first-stage compressor 1 as a low-temperature, low-pressure gaseous state.

[0064] The second-stage compressor 3 operates, compressing the refrigerant in the pipeline into a high-temperature, high-pressure gaseous state. The refrigerant condenses into a liquid state in the second heat exchanger 4, releasing heat during liquefaction. After being throttled and depressurized by a throttling device, it evaporates into a gaseous state in the first heat exchanger 6, absorbing the heat generated by the first-stage heat pump system. It then enters the second-stage compressor 3 as a low-temperature, low-pressure gaseous state.

[0065] The first water pump 7 operates, pumping water from the steam generator 5 through a pipeline to the second heat exchanger 4. In the second heat exchanger 4, the water absorbs the heat released by the liquefaction of the cold medium in the secondary heat pump system, thus heating the water. The water then returns to the steam generator 5 through a pipeline. This cycle continues until the water in the steam generator 5 is heated to about 120°C to generate steam.

[0066] like Figure 6 Defrosting mode

[0067] Under the control system, the four-way valve 9 connects the outlet of the primary compressor 1 to the finned heat exchanger 2 pipeline, and the inlet of the primary compressor 1 to the three-way valve 12 pipeline; under the control system, the three-way valve 12 connects the inlet of the primary compressor 1 to the defrost pipeline 13 (e.g., Figure 6 (The lower end of the middle) is connected. The first-stage compressor 1 and the first water pump 7 are working, while the fan of the second-stage compressor 3 and the finned heat exchanger 2 stops working.

[0068] The primary compressor 1 works to compress the refrigerant medium in the pipeline into a high-temperature and high-pressure gas state. The refrigerant medium is condensed into a liquid state in the finned heat exchanger 2, and the heat released during liquefaction realizes heating defrosting of the finned heat exchanger 2. Then, the refrigerant medium is throttled and depressurized by the throttling device, absorbs the heat of the hot water pumped by the steam generator 5 in the second heat exchanger 4 in the defrosting pipeline 13, and then vaporizes into a gas state to become a low-temperature and low-pressure gas that returns to the primary compressor 1 through the three-way valve 12 and the four-way valve 9.

Claims

1. A high temperature steam heat pump system for online defrosting, comprising: The primary heat pump system, the secondary heat pump system, the second heat exchanger (4) and the steam generator (5), the primary heat pump system and the secondary heat pump system are connected in series through the second heat exchanger (4) to provide heat energy to the steam generator (5), characterized in that the primary heat pump system further comprises a defrosting pipeline (13), and the refrigerant in the defrosting pipeline (13) absorbs heat energy of the medium in the steam generator (5) through the heat exchanger.

2. The high-temperature steam heat pump system with online defrosting of claim 1, wherein: The refrigerant of the primary heat pump system passes through the pipeline from the primary compressor (1), the four-way valve (9), the first heat exchanger (6), the throttling device (8), the fin heat exchanger (2), the four-way valve (9) back to the primary compressor (1), and the defrosting pipeline (13); the refrigerant of the secondary heat pump system passes through the pipeline from the secondary compressor (3), the second heat exchanger (4), the throttling device (8), the first heat exchanger (6) back to the secondary compressor (3); the water in the steam generator (5) absorbs heat energy generated by the primary heat pump system and the secondary heat pump system connected in series in the second heat exchanger (4) through the first water pump (7) and then returns to the steam generator (5).

3. The high-temperature steam heat pump system with online defrosting of claim 2, wherein: Further comprising a third heat exchanger (10), the defrosting pipeline (13) is a part of the refrigerant medium pipeline in the primary heat pump system, and the defrosting pipeline (13) absorbs heat energy of the medium in the steam generator (5) in the third heat exchanger (10).

4. The high-temperature steam heat pump system with online defrosting of claim 2, wherein: The defrosting pipeline (13) absorbs heat energy of the medium in the steam generator (5) in the second heat exchanger (4).

5. The high-temperature steam heat pump system of online defrosting of claim 3, wherein: Further comprising a second water pump (11), the water in the steam generator (5) returns to the steam generator (5) through the third heat exchanger (10) under the action of the second water pump (11).

6. The high-temperature steam heat pump system of online defrosting of claim 3, wherein: Further comprising a three-way valve (12), the first water pump (7), the inlet of the third heat exchanger (10) and the second heat exchanger (4) are respectively connected with the pipeline of the three-way valve (12); the outlet of the third heat exchanger (10) is connected with the pipeline of the steam generator (5).

7. The high-temperature steam heat pump system with online defrosting of claim 6, wherein: A pressure regulating valve (15) is arranged between the three-way valve (12) and the third heat exchanger (10).

8. The high-temperature steam heat pump system of online defrosting of claim 4, wherein: Further comprising a three-way valve (12), the four-way valve (9), one end of the defrosting pipeline (13) and the other end of the defrosting pipeline (13) are respectively connected with the pipeline of the three-way valve (12).

9. The high-temperature steam heat pump system for online defrosting according to any one of claims 1, 2, 5 to 8, characterized in that: Further comprising a temperature measuring device, the temperature measuring device detects the temperature of the surface of the fin heat exchanger (2), and the temperature measuring device, the primary compressor (1), the secondary compressor (3), the four-way valve (9), the fan of the fin heat exchanger (2) and the first water pump (7) are electrically connected with the control system.

10. The high-temperature steam heat pump system of online defrosting according to claim 9, characterized in that: The steam generator (5) is provided with a water supply pipe (14), a steam discharge port and a safety valve, the water supply pipe (14) is provided with a valve, and the steam discharge port is provided with a pressure valve.

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