Screw vapor temperature raising system driven by heat pump and waste heat

Abstract

This invention relates to the field of heat pump equipment technology, specifically to a screw steam heating system driven by a heat pump and waste heat recovery. It includes an evaporator, a compressor, a condenser, a waste heat recovery unit, and a heat treatment unit. The compressor is a two-stage screw compressor with an inlet and an outlet. The inlet integrates a swirling gas-liquid separation unit, which includes a base, a cylinder, a centrifugal disc, a liquid collection chamber, and a temperature control interface. The cylinder consists of an upper shell and a lower shell. The lower shell has a filter screen arranged coaxially with it on its inner side, and a confluence port is located at the bottom of the lower shell. This invention uses the high-speed rotation of the centrifugal disc to create a strong swirling flow field, efficiently ejecting liquid droplets entrained in the steam. Simultaneously, the elastic valves vibrate under controlled pressure from the airflow, disrupting the liquid film on the wall and preventing secondary entrainment. Liquid is then drained periodically from the liquid collection chamber, increasing the dryness of the incoming air and ensuring efficient steam heating.

Description

Technical Field

[0001] This invention relates to the field of heat pump equipment technology, specifically to a screw steam heating system driven by a heat pump and waste heat synergy. Background Technology

[0002] In industrial steam demand scenarios, traditional heat pump steam heating systems mostly rely on electric power to drive screw compressors to directly compress saturated steam to increase its temperature and pressure. Although this can achieve some energy savings, it does not effectively utilize industrial waste heat, resulting in limited energy utilization.

[0003] A currently published Chinese patent authorization announcement number, CN117906299B, discloses a water-cooled screw brine chiller unit with heat recovery function. The unit includes a compressor, a heat recovery assembly located at the rear of the compressor, and a control cabinet mounted on the upper surface of the compressor. The control cabinet houses a data processor connected to a control system. The heat recovery assembly includes a cylindrical body, with a first cover and a second cover bolted to both sides of the cylindrical body. A flow control section is located inside the cylindrical body, comprising a flow control plate, a first partition, and a second partition, respectively positioned on the first and second covers facing the cylindrical body. On one side of the body, several recovery pipes are installed through the first and second partitions. The flow control plate is connected to the recovery pipes. The first and second pump bodies are used for flow control of the heat recovery liquid. The first partition is connected to the output end of the first pump body via a pipe. The second partition is connected to the input end of the second pump body via a pipe with a second drain pipe. The input end of the first pump body is connected to a return pipe. The return pipe is connected to an inlet pipe. The output end of the second pump body is connected to a heat insulation pipe. The end of the heat insulation pipe connected to the return pipe is connected to the first drain pipe. A temperature detection unit is installed on the heat insulation pipe. A pressure sensor is installed through the cylinder.

[0004] According to the aforementioned patent, a heat recovery component is used to recover heat from high-temperature, high-pressure refrigerant. This is achieved by using a first drain pipe, insulation pipe, return pipe, and inlet pipe to adjust the liquid flow path in real time based on the heat recovery effect, thereby improving the heat recovery efficiency. However, while this patent can improve waste heat utilization efficiency, excessive heat recovery can lead to lower steam temperature and insufficient dryness, resulting in excessively high humidity steam entering the screw compressor. This can easily cause liquid slugging, accelerate screw wear, and reduce compression efficiency, ultimately hindering heating performance.

[0005] Therefore, there is a need for a screw steam heating system that combines heat pump and waste heat to efficiently utilize industrial waste heat while ensuring that the steam entering the compressor has sufficient dryness through intelligent adjustment of the evaporation temperature. Summary of the Invention

[0006] To address the problems existing in the current technology, a screw steam heating system driven by heat pump and waste heat is provided. The high-speed rotation of the centrifugal disc forms a strong swirling flow field, which efficiently throws out liquid droplets entrained in the steam. At the same time, the elastic valve generates controlled vibration under the action of airflow, which breaks the liquid film on the wall and prevents secondary entrainment. Liquid is drained from the collection chamber at regular intervals, which improves the dryness of the intake air and ensures efficient steam heating.

[0007] To address the problems of existing technologies, this invention provides a screw steam heating system driven by a heat pump and waste heat recovery, comprising an evaporator, a compressor, a condenser, a waste heat recovery unit, and a heat treatment unit. The compressor is a two-stage screw compressor with an inlet and an outlet. The inlet integrates a cyclone gas-liquid separation unit for centrifugal dehydration of low-pressure saturated steam, outputting inlet air with controllable dryness. The cyclone gas-liquid separation unit includes a base fixedly connected to the compressor and located at the front end of the compressor's inlet, and a cylindrical body fixedly mounted on the base, forming the main body of the separation chamber, inside which a steam... A cyclone channel and a centrifugal disc are coaxially arranged inside the cylinder and have a rotating shaft to guide the steam to rotate at high speed in the circumferential direction. A liquid collection chamber is located at the bottom of the cylinder to collect the ejected liquid droplets. The liquid collection chamber has a drain outlet. A temperature control interface is located on the side wall of the cylinder and communicates with the heat treatment unit to introduce pre-conditioned steam. The cylinder consists of an upper shell and a lower shell. A filter screen plate is arranged coaxially with the lower shell. An annular flow channel with a height difference is formed between the filter screen plate and the lower shell. A confluence port is opened at the bottom of the lower shell to connect the annular flow channel and the liquid collection chamber.

[0008] Preferably, the top of the upper housing is provided with a bearing seat, the upper end of the rotating shaft is rotatably connected to the bearing seat, and the lower end is rotatably connected to the filter screen plate. The temperature control interface is opened on the bearing seat in the area above the centrifugal disc, forming an axial inflow from top to bottom.

[0009] Preferably, the centrifugal disc has several centrifugal blades evenly distributed along its circumference, which are used to accelerate the steam entering from top to bottom and centrifugally throw it towards the inner wall of the cylinder.

[0010] Preferably, a plurality of elastic valves are evenly distributed circumferentially between the upper shell and the lower shell that make up the cylinder. The fixed end of the elastic valve is fixedly connected to the cylinder, and the movable end extends along the tangent direction of the centrifugal disk and is close to the outer edge of the centrifugal disk, forming a dynamic gap with the centrifugal disk that can vibrate and turbulentize.

[0011] Preferably, a limiting element is provided between every two adjacent elastic valves to limit the vibration amplitude of the elastic valve.

[0012] Preferably, the limiting member includes rubber wheels symmetrically arranged at the upper and lower ends of the elastic valve, and each rubber wheel is provided with a shaft fixedly connected to the upper housing or the lower housing.

[0013] Preferably, an elastic pressing member is provided between every two rubber wheels, a gap is left between the upper shell and the lower shell, and an outer ring is fixedly connected thereto. An elastic pressing member is provided on the outer ring corresponding to each elastic valve, and the elastic pressing member abuts against the outer surface of the elastic valve to form a radial elastic support structure.

[0014] Preferably, the elastic pressing member includes a pressing rod and a compression spring. One end of the pressing rod extends radially inward through the outer ring and is provided with a rubber ball head. A sleeve is coaxially provided on the outer side of the outer ring for each pressing rod. The two ends of the compression spring are fixedly connected to the pressing rod and the sleeve, respectively.

[0015] Preferably, the bottom inner surface of the lower housing is an inclined surface that gradually decreases from the center to the outer periphery, and liquid level sensors are provided around the upper housing at positions corresponding to the inclined surface.

[0016] Preferably, an annular valve is provided around the outer periphery of the lower housing inside the liquid collection chamber, and a plug is provided at the position of the annular valve corresponding to the manifold, which can move along the axial direction of the lower housing to control the opening and closing of the manifold.

[0017] The advantages of this application compared to the prior art are:

[0018] 1. This invention utilizes a swirling gas-liquid separation unit installed at the compressor inlet. Low-pressure saturated steam, initially temperature-regulated by a heat treatment unit, enters the cylinder from top to bottom through the shaft seat temperature control interface, impacting the upper surface of the centrifugal disc. As the centrifugal disc rotates, the circumferentially distributed centrifugal blades accelerate the steam and centrifugally throw it against the inner wall of the cylinder, forming a strong swirling flow field that efficiently separates entrained liquid droplets.

[0019] The condensate flows along the inner inclined surface of the lower casing through an annular flow channel and a manifold into the liquid collection chamber, and is discharged periodically by an electrically controlled annular valve. The dehydrated, high-dryness steam enters the two-stage screw compressor from the central area. This process inhibits the entry of wet steam at the source, avoids liquid slugging, and improves the dryness of the intake air and heating efficiency.

[0020] 2. The present invention provides elastic valves evenly distributed around the circumference of the cylinder and, in conjunction with limiting components, enables the elastic valves to generate controlled high-frequency micro-amplitude vibrations under the impact of swirling steam, effectively disrupting the boundary layer of the liquid film on the wall, promoting droplet desorption, and preventing secondary steam entrainment.

[0021] Meanwhile, the flexible deformation of the elastic valve absorbs the kinetic energy of the airflow, buffers pulsations, stabilizes pressure fluctuations, and limits the vibration amplitude through limiting components to prevent mutual collisions and wear, ensuring consistent dynamic gaps. The synergistic swirling flow field optimizes the internal flow pattern, improving gas-liquid separation efficiency.

[0022] 3. This invention forms a radially pre-tightened dynamic support structure by setting an elastic pressure member consisting of a pressure rod, a rubber ball head, and a compression spring on the outside of the elastic valve. When the elastic valve is displaced by the impact of swirling steam, the elastic pressure member expands and contracts accordingly, providing continuous and recoverable elastic pressure to effectively buffer vibration.

[0023] Simultaneously, working in conjunction with the upper and lower rubber wheels, the movement of the elastic valve is constrained radially and circumferentially, preventing relaxation, excessive deformation, or failure, and ensuring a uniform and stable turbulence gap. This enhances the overall effectiveness of the elastic valve in membrane rupture, preventing liquid accumulation, and damping vibration, thereby improving gas-liquid separation efficiency and reliability. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural schematic diagram of the screw steam heating system driven by heat pump and waste heat synergy according to the present invention.

[0025] Figure 2 This is a three-dimensional structural diagram of the compressor in the heat pump-waste heat co-driven screw steam heating system of the present invention.

[0026] Figure 3 This is a three-dimensional exploded view of the compressor of the screw steam heating system driven by the heat pump and waste heat synergy of the present invention.

[0027] Figure 4 This is a partial three-dimensional cross-sectional view of the swirling gas-liquid separation unit of the screw steam heating system driven by the heat pump and waste heat synergistically according to the present invention.

[0028] Figure 5 This is a schematic diagram of the steam path state of the screw steam heating system driven by the heat pump and waste heat synergy of the present invention.

[0029] Figure 6 This is the invention Figure 4 Enlarged diagram of point A.

[0030] Figure 7 This is a three-dimensional exploded view of the swirling gas-liquid separation unit of the screw steam heating system driven by the heat pump and waste heat synergistically according to the present invention.

[0031] Figure 8 This is a three-dimensional structural diagram of the elastic valve and centrifugal disk of the screw steam heating system driven by the heat pump and waste heat synergy of the present invention.

[0032] Figure 9 This is a top view of the elastic valve and centrifugal disk of the screw steam heating system driven by the heat pump and waste heat synergy of the present invention.

[0033] Figure 10 This is the invention Figure 9Enlarged diagram of point B.

[0034] Figure 11 This is a three-dimensional structural diagram of the bottom surface of the lower casing of the screw steam heating system driven by the heat pump and waste heat synergistically according to the present invention.

[0035] Figure 12 This is the invention Figure 5 Enlarged diagram of point C.

[0036] The diagram is labeled as follows: 1. Compressor; 11. Screw; 12. Inlet; 13. Outlet; 2. Cyclone gas-liquid separation unit; 21. Base; 22. Cylinder; 221. Steam cyclone channel; 23. Centrifuge disc; 231. Rotating shaft; 232. Centrifuge blades; 24. Liquid collection chamber; 241. Drain outlet; 25. Temperature control interface; 3. Upper housing; 31. Shaft seat; 32. Outer ring; 33. Liquid level sensor; 4. 41. Lower housing; 42. Filter screen; 43. Annular ferrule; 44. Positioning pin; 5. Manifold; 6. Elastic valve; 7. Limiting element; 8. Rubber wheel; 9. Elastic pressing element; 10. Pressing rod; 11. Rubber ball head; 12. Compression spring; 13. Sleeve; 14. Annular valve; 15. Plug; 16. Guide rod; 17. Return spring; 18. Fixed electromagnet; 19. Movable electromagnet. Detailed Implementation

[0037] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0038] See Figures 1 to 5 and Figure 11As shown, the heat pump-waste heat recovery synergistic driven screw steam heating system includes an evaporator, a compressor 1, a condenser, a waste heat recovery unit, and a heat treatment unit. The compressor 1 is a two-stage screw compressor structure, equipped with an inlet 12 and an outlet 13. The inlet 12 integrates a cyclone gas-liquid separation unit 2 for centrifugal dehydration of low-pressure saturated steam, outputting inlet air with controllable dryness. The cyclone gas-liquid separation unit 2 includes a base 21, fixedly connected to the compressor 1 and located at the front end of the compressor 1's inlet 12. A cylinder 22, fixedly mounted on the base 21, forms the main body of the separation chamber, with an internal steam cyclone channel 221. A centrifugal disc 23, coaxially mounted inside the cylinder 22, has a rotating shaft 231 for guiding steam to rotate at high speed circumferentially. A liquid collection chamber 24, located at the bottom of the cylinder 22, collects the ejected liquid droplets, and has a drain outlet 241. A temperature control interface 25 is located on the side wall of the cylinder 22 and communicates with the heat treatment unit for introducing steam for preliminary conditioning. The cylinder 22 consists of an upper shell 3 and a lower shell 4. A filter screen 41 is provided on the inner side of the lower shell 4 and is arranged coaxially therewith. An annular flow channel with a height difference is formed between the filter screen 41 and the lower shell 4. A confluence port 42 is provided at the bottom of the lower shell 4 to connect the annular flow channel with the liquid collection chamber 24.

[0039] The lower housing 4 has an annular groove on its inner side. The filter screen plate 41 has an annular sleeve 411 that engages with the annular groove. The annular sleeve 411 and the lower housing 4 are both provided with mutually aligned positioning holes in the radial position. A positioning pin 412 is inserted into each pair of positioning holes to realize the detachable installation of the filter screen plate 41.

[0040] The steam heating process begins with the pretreatment stage before the low-pressure saturated steam enters the compressor 1. The steam is generated by the evaporator under the action of industrial waste heat provided by the waste heat recovery unit, and is then guided to the cyclone gas-liquid separation unit 2 to achieve efficient dehydration and dryness control of the wet steam, providing stable intake conditions for the subsequent two-stage screw compressor 11.

[0041] Specifically, low-pressure saturated steam first enters the cylinder 22 through the temperature control interface 25, introducing pre-temperature-adjusted steam to prevent excessive moisture content due to excessive residual heat, thus inhibiting excessively wet steam from entering the compressor 1 at the source. When the residual heat is too strong, the working fluid water in the evaporator absorbs heat intensely, and the vaporization rate is too fast, causing a large number of bubbles to be rapidly generated and burst, resulting in the steam carrying a large number of incompletely vaporized tiny droplets. At the same time, if the heat input exceeds the requirements for stable evaporation, local boiling intensifies, easily forming mist-like wet steam, which reduces dryness and causes the moisture content to increase.

[0042] After steam enters the cylinder 22, it is forced to rotate at high speed in the circumferential direction under the action of the coaxially arranged centrifugal disk 23. The centrifugal disk 23 is supported between the base 21 and the filter screen 41 by its rotation axis 231, which accelerates the steam and centrifugally throws it towards the inner wall of the cylinder 22, forming a strong spiral airflow field. Under the action of this centrifugal force field, the liquid droplets entrained in the steam are thrown towards the inner wall of the cylinder 22 and slide down the wall surface. Before the sliding condensate collects in the liquid collection chamber 24 at the bottom of the cylinder 22, it must first flow through the annular flow channel formed by the filter screen 41 and the inner wall of the lower shell 4, which helps to stabilize the liquid film flow and prevent secondary entrainment.

[0043] Subsequently, the liquid flows into the liquid collection chamber 24 through the confluence port 42 at the bottom of the lower shell 4, and is finally discharged through the drain port 241, achieving complete gas-liquid separation. The high dryness steam after dehydration treatment smoothly enters the air inlet 12 of the two-stage screw compressor structure from the central area of ​​the cylinder 22, avoiding the risk of liquid slugging on the screw 11, laying the foundation for subsequent efficient and safe compression and heating, and enhancing the heating effect.

[0044] See Figure 4 and Figure 5 As shown, the upper housing 3 has a bearing seat 31 extending upward from the top. The upper end of the rotating shaft 231 is rotatably connected to the bearing seat 31, and the lower end is rotatably connected to the filter screen plate 41. The temperature control interface 25 is opened on the bearing seat 31 in the area above the centrifugal disk 23, forming an axial inflow from top to bottom.

[0045] The low-pressure saturated steam, after initial temperature regulation in the heat treatment unit, first enters the cyclone gas-liquid separation unit 2 through the temperature control interface 25. The temperature control interface 25 is located above the centrifugal disc 23, allowing the steam to be injected axially into the cylinder 22 from top to bottom along the rotation axis 231. Upon entry, the steam directly acts on the upper surface of the centrifugal disc 23, rapidly changing from axial flow to a circumferential spiral airflow rotating at high speed along the inner wall of the cylinder 22. This top-down axial inflow method, combined with the guidance of the centrifugal disc 23, not only effectively avoids steam flow deviation but also enhances the uniformity of the initial cyclone, laying the foundation for the flow field in subsequent efficient gas-liquid separation.

[0046] See Figure 4 and Figures 7 to 9 As shown, the centrifugal disc 23 has several centrifugal blades 232 evenly distributed along its circumference, which are used to accelerate the steam entering from top to bottom and centrifugally throw it toward the inner wall of the cylinder 22.

[0047] When the low-pressure saturated steam entering the cylinder 22 from top to bottom reaches the upper surface of the centrifugal disk 23, it first impacts and flows through several centrifugal blades 232 evenly distributed around the circumference of the centrifugal disk 23. During the rotation of the centrifugal disk 23, the steam gains circumferential velocity and is accelerated. As the steam is continuously guided to the outer edge, the centrifugal force increases rapidly, separating the entrained liquid droplets from the gas phase, and together they are thrown at high speed towards the inner wall of the cylinder 22.

[0048] Under strong centrifugal force, steam and liquid droplets adhere to the inner wall to form a vortex, while the dehydrated dry steam continues to flow towards the central area, thus completing an efficient gas-liquid separation process, allowing the steam to enter the compressor 1 through the filter screen 41.

[0049] See Figures 4 to 10 As shown, a number of elastic valves 5 are evenly distributed along the circumference between the upper shell 3 and the lower shell 4 that make up the cylinder 22. The fixed end of the elastic valve 5 is fixedly connected to the cylinder 22, and the movable end extends along the tangent direction of the centrifugal disk 23 and is close to the outer edge of the centrifugal disk 23, forming a dynamic gap with the centrifugal disk 23 that can vibrate and turbulent.

[0050] As the steam rotates at high speed inside the cylinder 22, the airflow flows tangentially along the outer edge of the centrifugal disk 23 and continuously impacts the surrounding elastic valve 5. When the swirling steam acts on the elastic valve 5, the airflow disturbance causes the elastic valve 5 to produce controlled high-frequency micro-amplitude vibrations.

[0051] On the one hand, the vibration effectively breaks the liquid film boundary layer near the inner wall of the cylinder 22 and the edge of the centrifugal disc 23, causing the attached droplets to detach and be thrown towards the liquid collection area, preventing local liquid film thickening or secondary entrainment.

[0052] On the other hand, the flexible deformation of the elastic valve 5 absorbs some of the airflow kinetic energy, buffering airflow pulsations and reducing pressure fluctuations, thereby improving the stability and continuity of the separation process. At the same time, since the elastic valve 5 is evenly distributed circumferentially and its moving end is close to the outer edge of the centrifuge disk 23, its vibration and swirling flow field work together to further optimize the uniformity of the internal flow field, which helps to improve the overall dehydration efficiency.

[0053] See Figure 8 and Figure 9 As shown, a limiting member 6 is provided between every two adjacent elastic valves 5 to limit the vibration amplitude of the elastic valve 5.

[0054] Under the continuous impact of swirling steam, each elastic valve 5 generates high-frequency micro-amplitude vibrations due to airflow disturbance. To prevent adjacent elastic valves 5 from colliding with each other due to excessive amplitude during vibration, a limiting member 6 is provided between every two adjacent elastic valves 5. This physical constraint limits the swing range of a single elastic valve 5, ensuring that its moving end reciprocates only within a preset safety gap.

[0055] This not only effectively avoids interference and wear between the valves, but also ensures the stability of each dynamic gap, making the turbulence effect uniform and controllable, while maintaining the continuity of the flow field and separation efficiency inside the cylinder 22.

[0056] See Figures 7 to 10 As shown, the limiting member 6 includes rubber wheels 61 symmetrically arranged at the upper and lower ends of the elastic valve 5, and each rubber wheel 61 is provided with a shaft fixedly connected to the upper housing 3 or the lower housing 4.

[0057] When the elastic valve 5 vibrates under the action of swirling steam, its two edges will shift to adjacent directions and lightly touch the corresponding rubber wheel 61. The rubber wheel 61 absorbs the impact energy with its elastic deformation ability, limiting the further displacement of the elastic valve 5, thereby effectively preventing collisions or excessive deformation between adjacent elastic valves 5.

[0058] Meanwhile, the rubber material avoids wear and noise caused by metal contact, ensuring a smooth and reliable limiting process, maintaining the consistency of dynamic gaps, and guaranteeing long-term stability of gas-liquid separation performance.

[0059] See Figures 4 to 6 As shown, an elastic pressing member 7 is provided between every two rubber wheels 61. A gap is left between the upper shell 3 and the lower shell 4, and an outer ring 32 is fixedly connected thereto. An elastic pressing member 7 is provided on the outer ring 32 corresponding to each elastic valve 5. The elastic pressing member 7 abuts against the outer surface of the elastic valve 5 to form a radial elastic support structure.

[0060] When the elastic valve 5 is vibrated, the elastic pressing member 7 continuously presses against the outer surface of the elastic valve 5 with its end, applying a moderate preload in the radial direction to form a stable elastic support structure. This not only limits the relaxation or swaying of the elastic valve 5 in the non-working state, but also provides a restoring force when it vibrates due to the impact of swirling steam, making its vibration amplitude more controllable and its response more stable.

[0061] Meanwhile, the elastic pressing member 7 and the rubber wheels 61 at the upper and lower ends work together to constrain the movement of the elastic valve 5 in both the radial and circumferential directions, preventing excessive deformation and maintaining the uniformity of the dynamic turbulence gap, thereby improving the gas-liquid separation efficiency and structural durability.

[0062] See Figures 4 to 6 As shown, the elastic pressing member 7 includes a pressing rod 71 and a compression spring 72. One end of the pressing rod 71 extends radially through the outer ring 32 and is provided with a rubber ball head 711. A sleeve 73 is coaxially provided on the outer side of the outer ring 32 corresponding to each pressing rod 71. The two ends of the compression spring 72 are fixedly connected to the pressing rod 71 and the sleeve 73 respectively.

[0063] When the elastic valve 5 undergoes a slight outward displacement due to steam impact, it pushes the rubber ball head 711 to drive the pressure rod 71 to slide outward, thereby compressing the compression spring 72 on the outer side of the outer ring 32. The elastic valve 5 dynamically expands and contracts with vibration, providing a continuous and recoverable elastic reaction force.

[0064] This process not only effectively buffers the vibration and impact of the elastic valve 5, but also ensures that it always maintains the preset working position, avoiding failure of the elastic valve 5, thereby improving the overall buffering performance of the elastic valve 5 in terms of turbulence, anti-liquid accumulation and vibration reduction.

[0065] See Figures 4 to 6 As shown, the bottom inner surface of the lower housing 4 is an inclined surface that gradually decreases from the center to the outer periphery, and liquid level sensors 33 are provided around the upper housing 3 at positions corresponding to the inclined surface.

[0066] During the gas-liquid separation process, the droplets thrown towards the elastic valve 5 by centrifugal force slide down the surface and eventually collect at the bottom of the lower shell 4. Since the inner bottom surface of the lower shell 4 is a slope that gradually decreases from the center to the outer periphery, the liquid naturally flows to the lower areas around it under the action of gravity, avoiding accumulation in the central area and ensuring that the liquid is quickly and smoothly guided to the confluence port 42.

[0067] Meanwhile, level sensors 33, installed around the upper housing 3 and facing the inclined area, monitor the height of the liquid film distributed along the inclined surface in real time. When the liquid level rises abnormally, the level sensors 33 can promptly send a signal to trigger drainage control, thereby preventing liquid backflow or secondary entrainment by steam and ensuring separation efficiency.

[0068] See Figure 11 and Figure 12 As shown, an annular valve 8 is provided around the outer periphery of the lower housing 4 inside the liquid collection chamber 24. The annular valve 8 is provided with a plug 81 at the position corresponding to the manifold 42, and can move along the axial direction of the lower housing 4 to control the opening and closing of the manifold 42.

[0069] The lower housing 4 is provided with guide rods 82 that pass through and slide with the annular valve 8. A return spring 821 is fixedly connected between the annular valve 8 and the lower housing 4. When the plug 81 opens the manifold 42, the return spring 821 is in a stretched state.

[0070] The liquid collection chamber 24 is provided with an electrical control structure for driving the annular valve 8 to move along the guide rod 82. The electrical control structure includes a fixed electromagnet 83 and a movable electromagnet 84 arranged vertically, both of which are annular and embedded in the liquid collection chamber 24. The fixed electromagnet 83 is fixedly connected to the inner wall of the liquid collection chamber 24, and the movable electromagnet 84 is fixedly connected to the annular valve 8.

[0071] When the liquid level reaches the set threshold, the electronic control structure is activated. After power is applied, a repulsive force is generated between the fixed electromagnet 83 and the movable electromagnet 84, which drives the movable electromagnet 84, which is fixed to the annular valve 8, to move downward along the axis. This causes the annular valve 8 to slide synchronously along the guide rod 82, causing the plug 81 to disengage from the manifold 42 position, and the condensate to be discharged rapidly under the action of gravity.

[0072] At this time, the return spring 821 connected between the annular valve 8 and the lower housing 4 is stretched, storing elastic potential energy. After the drainage is completed, the electrical control structure reverses or is de-energized, the return spring 821 retracts, pulling the annular valve 8 upward along the guide rod 82 to reset, and the plug 81 re-seals the manifold 42, restoring the sealing state.

[0073] This invention integrates a swirling gas-liquid separation unit 2 at the air inlet 12 of the compressor 1. Low-pressure saturated steam, temperature-regulated by the heat treatment unit, enters the cylinder 22 from top to bottom, impacting the centrifugal disc 23 and being accelerated by its circumferential centrifugal blades 232 to form a strong swirling flow field, efficiently separating liquid droplets. The condensate flows along the inclined surface of the lower shell 4 through an annular flow channel and a manifold 42 into the liquid collection chamber 24, and is periodically discharged by an electrically controlled annular valve 8. High-dryness steam enters the two-stage screw compressor 11 from the center, effectively preventing liquid slugging.

[0074] Meanwhile, elastic valves 5 are evenly distributed circumferentially within the cylinder 22. Under the action of swirling flow, they generate controlled high-frequency vibrations, disrupting the liquid film on the wall, preventing secondary entrainment, and absorbing airflow energy to buffer pulsations. The limiting component 6 and the upper and lower rubber wheels 61 limit the amplitude of the elastic valves 5, preventing collision and wear between adjacent elastic valves 5 and ensuring stable dynamic gaps. Furthermore, the elastic pressing component 7 provides radial preload, generating a recoverable reaction force when the elastic valves 5 are displaced. This, combined with the rubber wheels 61, achieves circumferential synergistic constraint, improving intake dryness and dehydration efficiency.

[0075] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of protection of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A screw steam heating system driven by heat pump and waste heat synergy, including an evaporator, compressor, condenser, waste heat recovery unit, and heat treatment unit; Its features are, in, The compressor is a two-stage screw compressor structure. It has an inlet and an outlet. The inlet integrates a cyclone gas-liquid separation unit for centrifugal dehydration of low-pressure saturated steam, outputting inlet air with controllable dryness. The cyclone gas-liquid separation unit includes: The base is fixedly connected to the compressor and is located at the front end of the compressor's air inlet; The cylindrical body is fixedly mounted on the base, forming the main body of the separation chamber, and an internal steam vortex channel is formed. The centrifugal disc is coaxially mounted inside the cylinder and is equipped with a rotating shaft to guide the steam to rotate at high speed in the circumferential direction; A liquid collection chamber, located at the bottom of the cylinder, is used to collect the ejected liquid droplets, and the liquid collection chamber is provided with a drain outlet; A temperature control interface is located on the side wall of the cylinder and is connected to the heat treatment unit for introducing steam for initial conditioning. The cylinder is composed of an upper shell and a lower shell. A filter screen plate is provided on the inner side of the lower shell and arranged coaxially therewith. An annular flow channel with a height difference is formed between the filter screen plate and the lower shell. A confluence port is provided at the bottom of the lower shell to connect the annular flow channel with the liquid collection chamber.

2. The screw steam heating system driven by heat pump and waste heat synergy according to claim 1, characterized in that, The upper housing has a bearing seat extending upward from the top. The upper end of the rotating shaft is rotatably connected to the bearing seat, and the lower end is rotatably connected to the filter screen. The temperature control interface is located on the bearing seat in the area above the centrifugal disc, forming an axial inflow from top to bottom.

3. The screw steam heating system driven by heat pump and waste heat synergy according to claim 2, characterized in that, The centrifugal disc has several centrifugal blades evenly distributed along its circumference, which are used to accelerate the steam entering from top to bottom and centrifugally throw it towards the inner wall of the cylinder.

4. The screw steam heating system driven by heat pump and waste heat synergy according to claim 3, characterized in that, Several elastic valves are evenly distributed circumferentially between the upper and lower shells that make up the cylinder. The fixed ends of the elastic valves are fixedly connected to the cylinder, and the movable ends extend along the tangent direction of the centrifugal disk and are close to the outer edge of the centrifugal disk, forming a dynamic gap with the centrifugal disk that can vibrate and turbulent.

5. The screw steam heating system driven by heat pump and waste heat synergy according to claim 4, characterized in that, A limiting element is provided between each two adjacent elastic valves to limit the vibration amplitude of the elastic valve.

6. The screw steam heating system driven by heat pump and waste heat synergy according to claim 5, characterized in that, The limiting component includes rubber wheels symmetrically arranged at the upper and lower ends of the elastic valve, and each rubber wheel is provided with a shaft fixedly connected to the upper or lower housing.

7. The screw steam heating system driven by heat pump and waste heat synergy according to claim 6, characterized in that, An elastic pressing member is provided between each pair of rubber wheels. A gap is left between the upper and lower housings and an outer ring is fixedly connected thereto. An elastic pressing member is provided on the outer ring for each elastic valve. The elastic pressing member abuts against the outer surface of the elastic valve to form a radial elastic support structure.

8. The screw steam heating system driven by heat pump and waste heat synergy according to claim 7, characterized in that, The elastic pressing component includes a pressing rod and a compression spring. One end of the pressing rod extends radially inward through the outer ring and is provided with a rubber ball head. A sleeve is coaxially provided on the outer side of the outer ring for each pressing rod. The two ends of the compression spring are fixedly connected to the pressing rod and the sleeve, respectively.

9. The screw steam heating system driven by heat pump and waste heat synergy according to claim 1, characterized in that, The bottom inner surface of the lower housing is a slope that gradually decreases from the center to the outer perimeter, and liquid level sensors are provided around the upper housing at positions corresponding to the slope.

10. The screw steam heating system driven by heat pump and waste heat synergy according to claim 1, characterized in that, An annular valve is provided around the outer periphery of the lower shell inside the liquid collection chamber. A plug is provided at the position of the annular valve corresponding to the manifold, and the manifold can be moved along the axial direction of the lower shell to control the opening and closing of the manifold.

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