Efficient and environment-friendly air source heat pump steam engine and application thereof

Abstract

The invention relates to the technical field of air source heat pump steam engines, in particular to an efficient and environment-friendly air source heat pump steam engine and application of the efficient and environment-friendly air source heat pump steam engine. A steam outlet of a gradient type liquid separation evaporator communicates with a gas-liquid separation tank and a first steam inlet of an inverter compressor through a four-way valve, and a monitoring assembly is arranged between the inverter compressor and the four-way valve; the variable-frequency compressor is communicated with the double-flow-channel condenser, the double-flow-channel condenser is communicated with the liquid storage device, the liquid storage device is communicated with the flash tank type economizer through the two-stage throttling assembly, the top of the flash tank type economizer is communicated with a steam supplementing opening of the variable-frequency compressor, and the flash tank type economizer is communicated with the gradient type liquid separation evaporator through the two-stage throttling assembly. The gradient type liquid separation evaporator is provided with a low-temperature auxiliary assembly. By the adoption of the structure, air serves as a heat source, zero pollutant emission is achieved, the frequency of the inverter compressor is dynamically adjusted according to loads, high efficiency and energy saving are achieved, the operation cost is reduced, and requirements of multiple fields such as textile printing and dyeing, food processing, chemical and medicine and agricultural greenhouse heating are met.

Description

Technical Field

[0001] This invention relates to the field of air source heat pump steam engine technology, and in particular to a high-efficiency and environmentally friendly air source heat pump steam engine and its applications. Background Technology

[0002] In industrial production and agricultural planting, steam, as a fundamental energy source, is widely used in fabric shaping, food sterilization, and greenhouse heating. Traditional steam production methods mainly rely on coal, oil, or gas-fired boilers, which have high operating costs, are significantly affected by fluctuations in fossil fuel prices, and require additional investment in pollutant treatment and equipment maintenance. To address the shortcomings of traditional steam production technologies, air source heat pump technology is gradually gaining attention due to its energy-saving and environmentally friendly advantages.

[0003] However, existing air-source heat pump steam engines still face many technical bottlenecks in practical applications: insufficient system operational stability, and the refrigerant easily entering the compressor in a gas-liquid mixed state during circulation, causing compressor liquid slugging damage. Energy recovery and utilization rates are low, and waste heat generated during system operation is not effectively recovered. Based on these technological limitations, developing a high-efficiency, environmentally friendly, low-temperature adaptable, and stable air-source heat pump steam engine has become a key requirement for promoting the green transformation of the steam production field. Summary of the Invention

[0004] The purpose of this invention is to provide a high-efficiency and environmentally friendly air source heat pump steam engine and its application. It uses air as a heat source and has zero pollutant emissions. The variable frequency compressor dynamically adjusts the frequency according to the load. Combined with a high-efficiency heat exchange structure, it is highly energy-efficient and reduces operating costs. It is suitable for the needs of multiple fields such as textile printing and dyeing, food processing, chemical and pharmaceutical industries, and agricultural greenhouse heating.

[0005] To achieve the above objectives, this invention provides a high-efficiency and environmentally friendly air-source heat pump steam engine, comprising a gradient-type liquid-liquid evaporator, a gas-liquid separator, a flash tank economizer, a liquid receiver, a variable frequency compressor, and a dual-flow condenser. The steam outlet of the gradient-type liquid-liquid evaporator is connected to the gas-liquid separator and the first steam inlet of the variable frequency compressor via a four-way valve. A monitoring component is provided between the variable frequency compressor and the four-way valve. The variable frequency compressor is connected to the dual-flow condenser via the four-way valve. The dual-flow condenser is connected to the liquid receiver. The liquid receiver is connected to the flash tank economizer via a two-stage throttling component. The top of the flash tank economizer is connected to the steam inlet of the variable frequency compressor. The flash tank economizer is connected to the gradient-type liquid-liquid evaporator via the two-stage throttling component. The gradient-type liquid-liquid evaporator is equipped with a low-temperature auxiliary component.

[0006] Preferably, the gradient liquid separator has several liquid distribution holes with trapezoidal cross-sections on the liquid distribution tube, each liquid distribution hole is connected to a coil, and the coils are provided with windward fins and leeward fins on the outside.

[0007] Preferably, the two-stage throttling assembly includes a primary electronic expansion valve and a secondary electronic expansion valve. The liquid receiver is connected to the inlet pipe of the flash tank economizer through the primary electronic expansion valve, and the outlet pipe of the flash tank economizer is connected to the distribution pipe of the gradient liquid separator evaporator through the secondary electronic expansion valve.

[0008] Preferably, the ultrasonic vibrator of the low-temperature auxiliary component is connected to the leeward fin side of the gradient liquid separator.

[0009] Preferably, the monitoring component is installed on the pipeline connecting the four-way valve and the variable frequency compressor. The monitoring component includes a pressure gauge, a temperature probe, a flow meter and a needle valve arranged in sequence.

[0010] Preferably, one end of the four-way valve is connected to the variable frequency compressor, and the other three ends are connected to the gradient liquid separator, the gas-liquid separator and the dual-flow condenser, respectively.

[0011] The aforementioned high-efficiency and environmentally friendly air-source heat pump steam engine is applied to the shaping, dyeing and drying of fabrics in textile printing and dyeing, the sterilization, cooking and drying of food in food processing, and in chemical, pharmaceutical and agricultural production.

[0012] Preferred applications in agricultural production include winter heating in greenhouses.

[0013] Therefore, the present invention employs the above-mentioned high-efficiency and environmentally friendly air-source heat pump steam engine and its application, the beneficial effects of which are: 1. The gradient liquid separator provided by the present invention provides a liquid distribution hole that ensures a balanced refrigerant supply to each coil. The leeward fins and the ultrasonic vibrator of the low-temperature auxiliary component are precisely matched to provide a better adhesion surface for defrosting and ensure heat exchange stability under low-temperature conditions. 2. The air source heat pump steam engine provided by the present invention significantly improves working efficiency by using the trapezoidal liquid distribution holes and double fins of the gradient liquid distribution evaporator, the dual-channel path of the dual-channel condenser, the flash tank economizer, and the gas replenishment and enthalpy increase linkage of the two-stage throttling component. 3. The air source heat pump steam engine provided by this invention uses air as a heat source and has zero pollutant emissions. The variable frequency compressor dynamically adjusts the frequency according to the load. Combined with a high-efficiency heat exchange structure, it is highly energy-efficient and reduces operating costs. It is suitable for the needs of multiple fields such as textile printing and dyeing, food processing, chemical and pharmaceutical industries, and agricultural greenhouse heating.

[0014] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a high-efficiency and environmentally friendly air source heat pump steam engine according to the present invention; Figure 2This is a partial schematic diagram of the gradient liquid separator in this invention; Figure 3 This is a schematic diagram of the four-way valve in this invention.

[0016] Figure label: 1. Gradient-type liquid separator evaporator; 11. Liquid separator pipe; 12. Liquid separator orifice; 13. Coil; 14. Windward fins; 15. Leeward fins; 2. Gas-liquid separator; 3. Flash tank economizer; 4. Liquid receiver; 5. Variable frequency compressor; 6. Dual-channel condenser; 7. Four-way valve; 71. First connection port; 72. Second connection port; 73. Third connection port; 74. Fourth connection port; 8. Monitoring components; 81. Pressure gauge; 82. Temperature probe; 83. Flow meter; 84. Needle valve; 9. Primary electronic expansion valve; 10. Secondary electronic expansion valve. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments. Unless otherwise defined, the technical or scientific terms used in this invention should be understood in their ordinary sense by those skilled in the art. The features mentioned above or in the specific examples mentioned in this invention can be combined arbitrarily, and these specific embodiments are only used to illustrate the invention and are not intended to limit the scope of the invention.

[0018] Example 1 like Figures 1-3 As shown, this invention provides a high-efficiency and environmentally friendly air-source heat pump steam engine, including a gradient-type liquid-liquid evaporator 1, a gas-liquid separator 2, a flash tank economizer 3, a liquid receiver 4, a variable frequency compressor 5, and a dual-flow condenser 6. The steam outlet of the gradient-type liquid-liquid evaporator 1 is connected to the gas-liquid separator 2 and the variable frequency compressor 5 via a four-way valve 7. A monitoring component 8 is provided between the variable frequency compressor 5 and the four-way valve 7. The variable frequency compressor 5 is connected to the dual-flow condenser 6, which is connected to the liquid receiver 4. The liquid receiver 4 is connected to the flash tank economizer 3 via a two-stage throttling component. The top of the flash tank economizer 3 is connected to the gas inlet of the variable frequency compressor 5. The flash tank economizer 3 is connected to the gradient-type liquid-liquid evaporator 1 via a two-stage throttling component. The gradient-type liquid-liquid evaporator 1 is equipped with a low-temperature auxiliary component.

[0019] The variable frequency compressor 5 drives the refrigerant in the following cycle: the gradient-type liquid-liquid evaporator 1 absorbs heat energy from the air to vaporize the refrigerant. The vaporized refrigerant enters the variable frequency compressor 5 through the four-way valve 7, and the monitoring component 8 collects the cycle parameters in real time. The variable frequency compressor 5 compresses the vaporized refrigerant to a high temperature and high pressure state and sends it directly to the dual-flow condenser 6. After exchanging heat with cold water, the refrigerant condenses into a liquid state, and the cold water absorbs heat and vaporizes to form steam for utilization. The liquid refrigerant in the receiver 4 is depressurized by the two-stage throttling component and enters the flash tank economizer 3 for gas-liquid separation. After gas-liquid separation, the gaseous refrigerant is added to the gas injection port of the variable frequency compressor 5 to increase enthalpy, and the liquid refrigerant returns to the gradient-type liquid-liquid evaporator 1 through the two-stage throttling component. The low-temperature auxiliary component starts under low-temperature conditions to ensure the heat exchange efficiency of the gradient-type liquid-liquid evaporator 1.

[0020] The gradient liquid separator evaporator 1 has several liquid distribution holes 12 with trapezoidal cross-sections on the liquid distribution tube 11. Each liquid distribution hole 12 is connected to a coil 13. The coils 13 are provided with windward fins 14 and leeward fins 15 on the outside.

[0021] The trapezoidal cross-section distribution holes 12 on the distribution pipe 11 utilize fluid dynamics characteristics. The trapezoidal flared structure reduces refrigerant inflow resistance, creating a stable flow velocity and ensuring uniform refrigerant distribution within the distribution pipe 11 to each distribution hole 12. Each distribution hole 12 corresponds to an independent coil 13, ensuring consistent refrigerant flow in each individual coil 13. The windward fins 14 and leeward fins 15 on the outside of the coil 13 form a three-dimensional heat exchange structure. The windward fins 14 directly capture heat energy from the airflow, while the leeward fins 15 utilize the airflow wake for secondary heat exchange. Simultaneously, the windward and leeward fins 14 and 15 increase the contact area with the air, enhancing heat conduction.

[0022] A water pump draws cold water into the inner tube of the dual-flow condenser 6, where preliminary heat exchange occurs in the shell side, raising the water temperature to near boiling point to form hot water. The hot water then enters the outer tube of the dual-flow condenser 6, where deep heat exchange occurs, rapidly raising the water temperature to boiling point and vaporizing. The resulting steam is then utilized. The two-stage throttling assembly includes a primary electronic expansion valve 9 and a secondary electronic expansion valve 10. The liquid receiver 4 is connected to the inlet pipe of the flash tank economizer 3 via the primary electronic expansion valve 9. The outlet pipe of the flash tank economizer 3 is connected to the distribution pipe 11 of the gradient-type separator evaporator 1 via the secondary electronic expansion valve 10.

[0023] The high-pressure liquid refrigerant discharged from the receiver 4 first passes through the primary electronic expansion valve 9, where it is depressurized to the working pressure of the flash tank economizer 3. Upon entering the flash tank economizer 3, the sudden pressure drop causes gas-liquid two-phase separation. The separated liquid refrigerant then enters the secondary electronic expansion valve 10, where it is further depressurized to the working pressure of the gradient liquid separator evaporator 1, adapting to the evaporation requirements of the refrigerant within the gradient liquid separator evaporator 1. The two-stage throttling component prevents heat exchange instability in the gradient liquid separator evaporator 1 due to sudden pressure changes. The precise control of the primary and secondary electronic expansion valves allows the system to respond quickly to changes in steam load; when steam demand increases, the refrigerant flow rate can be increased by increasing the opening degree.

[0024] The low-temperature auxiliary component includes an ultrasonic vibrator, which is connected to the leeward fin 15 side of the gradient liquid separator evaporator 1. When the ambient temperature is below 5°C and the temperature of the leeward fin 15 of the gradient liquid separator evaporator 1 is below 0°C, the ultrasonic vibrator is activated. The high-frequency vibration causes micro-cracks in the frost layer formed on the fin surface, reducing the adhesion between the frost layer and the leeward fin 15, and causing it to fall off under the action of airflow.

[0025] The monitoring components are installed on the pipeline connecting the four-way valve 7 and the variable frequency compressor 5. The monitoring components include a pressure gauge 81, a temperature probe 82, a flow meter 83, and a needle valve 84, arranged sequentially. The pressure gauge 81 collects refrigerant pressure signals through a pressure sensor, the temperature probe 82 collects temperature signals using a PT100 platinum resistance thermometer, and the flow meter 83 collects refrigerant flow signals through electromagnetic induction. These three components are connected in series on the high-pressure pipeline between the four-way valve 7 and the variable frequency compressor 5. The needle valve 84 has a manually adjustable structure, allowing manual shut-off or fine-tuning of the refrigerant flow during equipment commissioning or troubleshooting, and assisting in parameter calibration.

[0026] One end of the four-way valve 7 is connected to the variable frequency compressor 5, and the other three ends are connected to the gradient liquid separator evaporator 1, the gas-liquid separator 2, and the dual-flow condenser 6, respectively. The gas-liquid separator 2 connects the gradient liquid separator evaporator 1 to the suction port of the variable frequency compressor 5 through the four-way valve 7. The first connection port 71 of the four-way valve 7 is connected to the variable frequency compressor 5, the second connection port 72 is connected to the dual-flow condenser 6, the third connection port 73 is connected to the gas-liquid separator 2, and the fourth connection port 74 is connected to the gradient liquid separator evaporator 1.

[0027] The four-way valve 7 has a rotatable valve core inside, and the flow channel is switched by controlling the position of the valve core through an electromagnetic coil. The gas-liquid separator 2 is connected to the four-way valve 7. In the steam production mode, the valve core draws the gas from the gradient liquid separator evaporator 1 into the four-way valve 7 and then into the gas-liquid separator 2. The gas-liquid separator 2 is connected to the suction port of the variable frequency compressor 5, which separates the liquid components entrained in the vaporized refrigerant flowing out of the gradient liquid separator evaporator 1. The separated gaseous refrigerant is then sent to the variable frequency compressor 5.

[0028] During operation, the refrigerant cycle starts as follows: the variable frequency compressor 5 is started, the four-way valve 7 is energized to switch to steam production mode, and the refrigerant path is opened. The gaseous refrigerant produced by the gradient-type evaporator 1 enters the gas-liquid separator 2 after passing through the four-way valve 7, where the liquid is removed before being sent to the variable frequency compressor 5. The high-temperature, high-pressure gaseous refrigerant obtained by the variable frequency compressor 5 enters the shell side of the dual-flow condenser 6 through the four-way valve 7, where it exchanges heat with the cold water in the tube side and condenses into liquid refrigerant. The steam obtained in the tube side is utilized. The resulting liquid refrigerant is depressurized by the first-stage electronic expansion valve 9 and enters the flash tank economizer 3. The liquid refrigerant at the bottom of the flash tank economizer 3 returns to the gradient-type evaporator 1 through the second-stage electronic expansion valve 10.

[0029] Example 2 The steam generated by the efficient and environmentally friendly air source heat pump steam engine in Example 1 is used for the setting, dyeing and drying of fabrics in textile printing and dyeing, sterilization, cooking and drying of food in food processing, and in chemical, pharmaceutical and agricultural production. The application in agricultural production includes winter heating of greenhouses.

[0030] Therefore, the present invention adopts the above-mentioned efficient and environmentally friendly air source heat pump steam engine and its application, which uses air as a heat source and has zero pollutant emissions. The variable frequency compressor dynamically adjusts the frequency according to the load, and combined with the efficient heat exchange structure, it is highly energy-efficient and reduces operating costs, making it suitable for the needs of multiple fields such as textile printing and dyeing, food processing, chemical and pharmaceutical industries and agricultural greenhouse heating.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A high-efficiency and environmentally friendly air-source heat pump steam engine, characterized in that: The system includes a gradient-type liquid separator, a gas-liquid separator, a flash tank economizer, a receiver, a variable frequency compressor, and a dual-flow condenser. The steam outlet of the gradient-type liquid separator is connected to the gas-liquid separator and the first steam inlet of the variable frequency compressor via a four-way valve. A monitoring component is installed between the variable frequency compressor and the four-way valve. The variable frequency compressor is connected to the dual-flow condenser via the four-way valve. The dual-flow condenser is connected to the receiver. The receiver is connected to the flash tank economizer via a two-stage throttling component. The top of the flash tank economizer is connected to the steam inlet of the variable frequency compressor. The flash tank economizer is connected to the gradient-type liquid separator via a two-stage throttling component. The gradient-type liquid separator is equipped with a low-temperature auxiliary component.

2. The high-efficiency and environmentally friendly air-source heat pump steam engine according to claim 1, characterized in that: The gradient liquid separator has several liquid distribution holes with trapezoidal cross-sections on its liquid distribution tubes. Each liquid distribution hole is connected to a coil. The coils are equipped with windward fins and leeward fins on their exteriors.

3. The high-efficiency and environmentally friendly air-source heat pump steam engine according to claim 1, characterized in that: The two-stage throttling assembly includes a primary electronic expansion valve and a secondary electronic expansion valve. The liquid receiver is connected to the inlet pipe of the flash tank economizer through the primary electronic expansion valve, and the outlet pipe of the flash tank economizer is connected to the distribution pipe of the gradient separator evaporator through the secondary electronic expansion valve.

4. The high-efficiency and environmentally friendly air-source heat pump steam engine according to claim 2, characterized in that: The ultrasonic vibrator of the low-temperature auxiliary component is connected to the leeward side of the gradient liquid separator evaporator.

5. The high-efficiency and environmentally friendly air-source heat pump steam engine according to claim 1, characterized in that: The monitoring components are installed on the pipeline connecting the four-way valve and the variable frequency compressor. The monitoring components include a pressure gauge, a temperature probe, a flow meter and a needle valve arranged in sequence.

6. The high-efficiency and environmentally friendly air-source heat pump steam engine according to claim 1, characterized in that: One end of the four-way valve is connected to the variable frequency compressor, and the other three ends are connected to the gradient liquid separator, the gas-liquid separator, and the dual-flow condenser, respectively.

7. An application of a high-efficiency and environmentally friendly air-source heat pump steam engine, characterized in that: The efficient and environmentally friendly air source heat pump steam engine according to any one of claims 1-6 is applied to the shaping, dyeing and drying of fabrics in textile printing and dyeing, the sterilization, cooking and drying of food in food processing, and chemical, pharmaceutical and agricultural production.

8. The application of the high-efficiency and environmentally friendly air-source heat pump steam engine according to claim 7, characterized in that: Applications in agricultural production include winter heating in greenhouses.

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