Multistage centrifugal compressor for high temperature heat pumps

Abstract

The application relates to the technical field of compressors and discloses a multistage centrifugal compressor for high-temperature heat pumps, which comprises a compressor body, an air inlet pipe arranged on one side of the compressor body, an air outlet pipe arranged on the other side of the compressor body, and a buffer component arranged on the air outlet pipe; the buffer component comprises a primary buffer assembly arranged on the air outlet pipe, and a rotating assembly and a cleaning assembly are arranged on the primary buffer assembly. The multistage centrifugal compressor for high-temperature heat pumps cooperatively functions through the primary buffer assembly, a secondary buffer assembly and a displacement assembly, so that the multistage centrifugal compressor for high-temperature heat pumps effectively reduces the pressure pulsation amplitude of output gas, and reduces the impact of pressure fluctuation on downstream equipment. This avoids the abnormal action of pneumatic equipment caused by unstable pressure, guarantees the stability of product quality of a production line, prevents equipment failure and shutdown maintenance caused by airflow pulsation, and prolongs the operation cycle of the whole system.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and in particular to a multi-stage centrifugal compressor for high-temperature heat pumps. Background Technology

[0002] High-temperature heat pumps, as efficient heat energy conversion devices, can convert low-grade heat energy into high-grade heat energy and are widely used in industrial waste heat recovery, district heating, and building heating, which is of great significance for energy conservation and emission reduction. However, traditional high-temperature heat pumps are limited by compressor performance and are inadequate to meet high loads and high temperature demands. Multi-stage centrifugal compressors, through multi-stage series connection, achieve step-by-step pressurization of the working fluid, breaking through the limitations of single-stage compression in terms of pressure ratio and temperature increase, significantly enhancing the heating capacity and efficiency of high-temperature heat pumps, and providing more efficient and reliable technical support for scenarios such as deep utilization of industrial waste heat and large-scale centralized urban heating. Existing multi-stage centrifugal compressors still have the following shortcomings in use:

[0003] 1. The periodic or intermittent discharge of compressed gas by the compressor can cause significant fluctuations in system pressure. This pressure instability directly affects the operational accuracy of downstream equipment. For example, in processes requiring stable gas pressure, fluctuating pressure can cause processing equipment to malfunction, such as deviations in the opening and closing frequency or force of pneumatic valves, thus affecting product quality consistency. At the same time, pressure fluctuations can also cause vibrations in pipelines and equipment, which may lead to loosening of connections and wear of seals over a long period of time, increasing the risk of leakage and even shortening the overall service life of the equipment.

[0004] 2. When gas is periodically discharged, alternating high-pressure and low-pressure zones form within the pipeline. This pulsation not only generates noise but also causes turbulent energy loss in pipe bends and valves. Furthermore, if the system is equipped with precision flow sensors or pressure transmitters, intermittent airflow can interfere with sensor signal acquisition, leading to misjudgments and frequent adjustments by the control system, further amplifying energy loss and equipment operating errors. Summary of the Invention

[0005] Given that the intermittent gas discharge in existing technologies can cause downstream equipment to operate unstablely due to pressure fluctuations, such as abnormal operation of pneumatic equipment and impact on product quality of the production line; it can also exacerbate airflow pulsation losses, leading to energy loss, equipment wear and noise generation, while interfering with sensor signals and affecting the accuracy of the control system, a multi-stage centrifugal compressor for high-temperature heat pumps is proposed.

[0006] This application provides a multi-stage centrifugal compressor for high-temperature heat pumps, the purpose of which is to: eliminate pipeline pressure fluctuations to ensure the operational stability of downstream equipment, avoid abnormal operation of pneumatic devices and product quality deviations; suppress airflow pulsation losses, reduce energy loss, equipment wear and noise, and at the same time ensure accurate sensor signals, thereby improving system control precision and overall operating efficiency.

[0007] The technical solution of the present invention is: a multi-stage centrifugal compressor for high-temperature heat pumps, including a compressor body, an inlet pipe on one side of the compressor body, an outlet pipe on the other side of the compressor body, and a buffer component disposed on the outlet pipe.

[0008] The buffer component includes a primary buffer assembly installed on the air outlet pipe, and the primary buffer assembly is equipped with a rotating component and a cleaning component.

[0009] The buffer component is used to buffer the gas entering the outlet pipe;

[0010] The primary buffer assembly includes an auger shaft installed inside the air outlet pipe, a movable groove on the auger shaft, a connecting shaft inside the movable groove, a buffer spring between the connecting shaft and the inner wall of the movable groove, and a filter screen on the connecting shaft.

[0011] Furthermore, the rotating assembly includes a rotating ring disposed on the filter screen, a spiral groove disposed in the air outlet pipe, and a protrusion disposed on the inner side of the spiral groove, the protrusion being fixedly connected to the rotating ring.

[0012] Furthermore, the cleaning assembly includes an arc-shaped plate mounted on a connecting shaft, a collection box mounted on an air outlet pipe, a telescopic rod mounted on the collection box, a scraper mounted on one end of the telescopic rod, the scraper abutting against the arc-shaped plate, and a telescopic spring mounted between the other end of the telescopic rod and the collection box.

[0013] Furthermore, the buffer component also includes a displacement component disposed on the cleaning component, a secondary buffer component and a protection component disposed on the primary buffer component, and a locking component disposed on the cleaning component;

[0014] The displacement component includes a groove on the scraper, a slider inside the groove, a displacement spring between the slider and the inner wall of the groove, and a telescopic rod fixedly connected to the slider.

[0015] Furthermore, the secondary buffer assembly includes auger blades disposed on the auger shaft, and fan blades are also disposed on the auger shaft.

[0016] Furthermore, the protection component includes a protection spring disposed on the connecting shaft, the protection spring being rotatably connected to the auger shaft, and a fixing ring disposed on the connecting shaft, the fixing ring abutting against the protection spring.

[0017] Furthermore, the locking assembly includes a locking rod disposed on the collection box, a locking spring disposed between one end of the locking rod and the collection box, and a limit plate disposed at the other end of the locking rod.

[0018] The beneficial effects of this invention are:

[0019] 1. Through the synergistic action of primary, secondary, and displacement components, the high-temperature heat pump multi-stage centrifugal compressor effectively reduces the pressure pulsation amplitude of the output gas, minimizing the impact of pressure fluctuations on downstream equipment. This prevents abnormal operation of pneumatic equipment due to unstable pressure, ensuring the stability of product quality on the production line, preventing equipment failures and downtime for maintenance caused by airflow pulsation, and extending the overall system's operating cycle. Simultaneously, the cooperation of the cleaning and locking components ensures timely removal of impurities and secure installation of the collection box, preventing impurities from clogging pipes and affecting airflow, comprehensively improving the reliability of system operation and reducing production losses caused by unexpected failures.

[0020] 2. The system utilizes the kinetic energy of the gas itself to drive components such as fan blades and auger blades, achieving buffering and cleaning functions without the need for an external power source, thus reducing energy consumption. Furthermore, by effectively suppressing airflow pulsation losses, it reduces turbulent energy loss within the pipeline, improving system energy efficiency. Simultaneously, stable airflow output reduces equipment vibration and noise, improving the working environment, and the long-life design of components reduces replacement frequency and waste generation, achieving environmental benefits while saving energy, aligning with the concept of sustainable development.

[0021] 3. The cleaning component can scrape away impurities from the filter screen in real time, preventing filter clogging and reducing the frequency and difficulty of manual filter cleaning; the protection component provides buffer protection for critical components, extending the service life of core components such as the connecting shaft and auger shaft, and reducing component replacement costs. The locking component's convenient collection box assembly and disassembly make cleaning easier and more efficient, allowing maintenance personnel to complete impurity removal without complicated operations. The overall structure optimizes the maintenance process, reduces maintenance time and labor costs, minimizes the impact of downtime maintenance on production schedules, and improves enterprise production efficiency. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0023] Figure 2 This is a schematic cross-sectional view of the air outlet pipe of the present invention;

[0024] Figure 3 This is a schematic diagram of the buffer component structure of the present invention;

[0025] Figure 4 This is a schematic diagram of the primary buffer component structure of the present invention;

[0026] Figure 5 This is a schematic diagram of the rotating component structure of the present invention;

[0027] Figure 6 This is a schematic diagram of the cleaning component structure of the present invention;

[0028] Figure 7 This is a schematic diagram of the displacement component structure of the present invention;

[0029] Figure 8 This is a schematic diagram of the secondary buffer component structure of the present invention;

[0030] Figure 9 This is a schematic diagram of the protective component structure of the present invention;

[0031] Figure 10 This is a schematic diagram of the locking component structure of the present invention.

[0032] In the picture:

[0033] 1. Compressor body; 11. Inlet pipe; 12. Outlet pipe; 2. Primary buffer assembly; 21. Screw shaft; 22. Movable groove; 23. Connecting shaft; 24. Buffer spring; 25. Filter screen; 3. Rotating assembly; 31. Rotating ring; 32. Spiral groove; 33. Protrusion; 4. Cleaning assembly; 41. Arc plate; 42. Collection box; 43. Telescopic rod; 44. Scraper; 45. Telescopic spring; 5. Displacement assembly; 51. Slide groove; 52. Slider; 53. Displacement spring; 6. Secondary buffer assembly; 61. Screw blade; 62. Fan blade; 7. Protection assembly; 71. Protection spring; 72. Fixing ring; 8. Locking assembly; 81. Locking rod; 82. Locking spring; 83. Limit plate. Detailed Implementation

[0034] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0035] Example 1, referring to Figures 1-6This is the first embodiment of the present invention, which provides a multi-stage centrifugal compressor for a high-temperature heat pump, including a compressor body 1, an inlet pipe 11 fixedly connected to one side of the compressor body 1, an outlet pipe 12 fixedly connected to the other side of the compressor body 1, and a buffer component installed on the outlet pipe 12; the buffer component includes a primary buffer assembly 2 installed on the outlet pipe 12, and a rotating assembly 3 and a cleaning assembly 4 are installed on the primary buffer assembly 2; the buffer component is used to buffer the gas entering the outlet pipe 12; the primary buffer assembly 2 includes an auger shaft 21 rotatably connected to the outlet pipe 12, a movable groove 22 is opened on the auger shaft 21, a connecting shaft 23 is slidably connected in the movable groove 22, a buffer spring 24 is fixedly connected between the connecting shaft 23 and the inner wall of the movable groove 22, and a filter screen 25 is rotatably connected to the connecting shaft 23.

[0036] Specifically, during operation, external gas enters the compressor body 1 through the inlet pipe 11. The gas first enters the center of the first-stage impeller, where the high-speed rotation of the impeller generates centrifugal force, accelerating the gas and causing it to flow radially, converting it into kinetic and pressure energy. After entering the diffuser, the cross-sectional area of ​​the channel increases, the flow velocity decreases, and the kinetic energy is converted into pressure energy, further increasing the gas pressure. The gas passing through the diffuser changes direction through a bend and a return flow device, entering the center of the next-stage impeller, repeating the above compression process. Each stage of compression increases the gas pressure and temperature. After multiple stages of compression, the gas finally reaches the required pressure and is discharged through the volute and outlet pipe 12. However, since the processes of intake and compression exhaust are inherently periodic and intermittent, the output compressed gas inevitably exhibits periodic fluctuations in flow rate and pressure. These fluctuations can easily cause pressure pulsations in the delivery pipeline. By using a buffer component to buffer the gas in the outlet pipe 12, the problem of intermittent gas discharge causing unstable operation of downstream equipment due to pressure fluctuations can be solved. This can lead to abnormal operation of pneumatic equipment, impact on product quality on the production line, etc. It can also exacerbate airflow pulsation losses, resulting in energy loss, equipment wear and noise generation, while interfering with sensor signals and affecting the accuracy of the control system.

[0037] The gas entering the outlet pipe 12 is filtered through the filter screen 25. The gas entering the outlet pipe 12 pushes the filter screen 25 to move, compressing the buffer spring 24 via the connecting shaft 23. The buffer spring 24 buffers the movement of the filter screen 25, thus providing a primary buffer for the compressed gas entering the outlet pipe 12. Furthermore, the filter screen 25 rotates during movement, making it difficult for compressed gas to pass through the mesh of the filter screen 25, further improving the filtration and buffering effect of the filter screen 25. The elastic deformation of the buffer spring 24 absorbs pressure fluctuations during periodic gas discharge, preventing abnormal operation of downstream pipelines due to sudden pressure changes. It suppresses turbulent energy loss caused by airflow pulsation, reduces kinetic energy loss at pipe bends and valves, and improves system energy efficiency. It weakens the periodic impact of pulsating airflow on the inner wall of the pipe and equipment, reducing the risk of metal fatigue damage, while also suppressing airflow noise.

[0038] Reference Figure 4 and Figure 5 The rotating assembly 3 includes a rotating ring 31 that is unidirectionally rotatably connected to the filter screen 25, a spiral groove 32 opened in the air outlet pipe 12, a protrusion 33 that is slidably connected to the inner side of the spiral groove 32, and the protrusion 33 is fixedly connected to the rotating ring 31.

[0039] Specifically, when compressed gas enters the outlet pipe 12 from the volute, the airflow pushes the filter screen 25 to move axially, and the rotating ring 31 moves synchronously with the filter screen 25. Since the rotating ring 31 engages with the spiral groove 32 on the inner wall of the outlet pipe 12 through the protrusion 33, the axial displacement forces the protrusion 33 to slide along the trajectory of the spiral groove 32, driving the rotating ring 31 to rotate the filter screen 25 around the center of the auger shaft 21, so that the filter screen 25 produces a dynamic filtration effect when buffering the airflow, avoiding the accumulation of impurities in a single area to extend the filter screen life; the gas pressure fluctuation causes the axial displacement of the filter screen 25 to change with the airflow intensity. During the compression and rebound of the buffer spring 24, the rotating component 3 makes the filter screen 25 rotate continuously. The gas needs to overcome the rotational resistance of the filter screen to pass through, further consuming pulsating energy and enhancing the buffering effect. Moreover, the rotation makes the filter screen surface evenly bear the airflow impact, avoiding local wear and improving durability; during the rebound of the buffer spring 24, since a one-way rotating bearing is provided between the rotating ring 31 and the filter screen 25, the filter screen 25 does not rotate during the reset process, avoiding interference with the cleaning component 4. When the filter screen 25 rotates, the cleaning component 4 works synchronously to scrape off the impurities on the filter screen and guide them to the slag discharge port, preventing the filter screen from clogging and ensuring smooth gas flow to maintain long-term stable operation of the system. The rotating component 3 and the cleaning component 4 thus significantly improve the stability of the compressor outlet gas, reduce the impact of pressure pulsation on downstream equipment, and extend the filter screen life and reduce system maintenance costs through self-cleaning and dynamic filtration.

[0040] Example 2, refer to Figure 6This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that the cleaning component 4 includes an arc-shaped plate 41 fixedly connected to the connecting shaft 23, a collection box 42 inserted into the air outlet pipe 12, a telescopic rod 43 slidably connected to the collection box 42, a scraper 44 fixedly connected to one end of the telescopic rod 43, the scraper 44 abutting against the arc-shaped plate 41, and a telescopic spring 45 fixedly connected between the other end of the telescopic rod 43 and the collection box 42.

[0041] Specifically, the filter screen 25 moves and rotates axially along the auger shaft 21 under the push of airflow, intercepting impurities in the gas. The connecting shaft 23 rotates, causing the arc plate 41 to rotate synchronously. Its edge is in close contact with the surface of the filter screen 25. During the rotation, it scrapes off the impurities attached to the surface of the filter screen, preventing the filter screen from clogging and affecting the filtration and buffering effect. The impurities scraped off by the arc plate 41 will adhere to its surface. At this time, the scraper 44, which abuts against the arc plate 41, plays a role. Under the elastic force of the telescopic spring 45, it always adheres to the surface of the arc plate 41. As the arc plate 41 moves, the scraper 44 slides along the telescopic rod 43, scraping off the impurities on the arc plate 41 and sweeping them into the collection box 42. This dual cleaning structure ensures that the filter screen 25 continuously and efficiently filters, maintaining stable gas buffering performance. On the other hand, it prevents impurities from accumulating in the outlet pipe 12, reducing airflow resistance, reducing equipment wear, extending the overall service life of the compressor, and reducing the frequency of manual cleaning, thus improving the economic efficiency and reliability of system operation.

[0042] Reference Figures 7-10 The buffer component also includes a displacement component 5 installed on the cleaning component 4, a secondary buffer component 6 and a protection component 7 installed on the primary buffer component 2, and a locking component 8 installed on the cleaning component 4;

[0043] The displacement component 5 includes a groove 51 formed on the scraper 44, a slider 52 is slidably connected to the inner side of the groove 51, a displacement spring 53 is fixedly connected between the slider 52 and the inner wall of the groove 51, and a telescopic rod 43 is fixedly connected to the slider 52.

[0044] Specifically, the filter screen 25 undergoes axial displacement under airflow pressure fluctuations, causing the arc-shaped plate 41 fixed to the connecting shaft 23 to move synchronously. At this time, the telescopic rod 43 pushes the scraper 44 through its connection with the slider 52. The slider 52 slides within the groove 51 and is constrained by the displacement spring 53, allowing the scraper 44 to move synchronously with the arc-shaped plate 41. The buffering force provided by the displacement spring 53 ensures that the scraper 44 and the arc-shaped plate 41 always remain in contact. When the filter screen 25 moves in the opposite direction, the displacement component 5 can still ensure the dynamic synchronization of the scraper 44 and the arc-shaped plate 41. Through elastic linkage, the scraper 44 and the arc-shaped plate 41 follow seamlessly, improving the impurity removal efficiency and ensuring the permeability of the filter screen 25. The remaining structure is the same as that in Embodiment 1.

[0045] Example 3, referring to Figure 8 This is the third embodiment of the present invention. The difference between this embodiment and the second embodiment is that the secondary buffer assembly 6 includes an auger blade 61 fixedly sleeved on the auger shaft 21, and a fan blade 62 is also fixedly sleeved on the auger shaft 21.

[0046] Specifically, gas is discharged from the outlet pipe 12, and the high-speed airflow directly impacts the fan blade 62, driving it to rotate rapidly due to the impact force. Since the fan blade 62 is fixedly mounted on the auger shaft 21, it drives the auger shaft 21 to rotate synchronously, causing the auger blade 61, also fixedly mounted on the auger shaft 21, to rotate accordingly. The spiral structure of the auger blade 61 generates an axial pushing force on the gas, disrupting its original pulsation rhythm and extending its flow path within the outlet pipe 12. Through friction and guidance, it dissipates the pulsating energy of the gas, achieving secondary buffering of the airflow. This not only effectively reduces pressure fluctuations during gas discharge, ensuring stable operation of downstream equipment, but also reduces pipeline vibration and noise through dynamic buffering; utilizing the gas's own kinetic energy to drive the buffer components requires no additional energy, making it energy-saving and environmentally friendly; and comprehensively enhances the reliability and operating efficiency of the high-temperature heat pump system.

[0047] Reference Figure 9 The protective component 7 includes a protective spring 71 sleeved on the connecting shaft 23. The protective spring 71 is rotatably connected to the auger shaft 21. A fixing ring 72 is also fixedly connected to the connecting shaft 23, and the fixing ring 72 abuts against the protective spring 71.

[0048] Specifically, fluctuations in airflow pressure cause axial displacement of the filter screen 25, which in turn causes the connecting shaft 23 to slide within the movable groove 22 of the auger shaft 21. At this time, one end of the protective spring 71, sleeved on the connecting shaft 23, is rotatably connected to the auger shaft 21, while the other end abuts against the fixing ring 72. When the connecting shaft 23 moves axially, the fixing ring 72 compresses the protective spring 71, and the spring generates a reverse elastic force to buffer the impact load, preventing a rigid collision between the connecting shaft 23 and the auger shaft 21. If a sudden change in airflow pressure causes rapid displacement of the filter screen 25, the elastic deformation of the protective spring 71 can absorb the instantaneous energy, reducing the peak impact force. When the airflow stabilizes, the protective spring 71 rebounds, pushing the fixing ring 72 back to its original position, ensuring smooth sliding of the connecting shaft 23 within the movable groove 22. This not only extends the service life of the connecting shaft 23 and the auger shaft 21 and reduces the maintenance frequency, but also reduces system vibration and noise by buffering impacts, thus improving the stability of equipment operation. In addition, the preload of the protective spring 71 can optimize the axial displacement characteristics of the filter screen 25, enhance its buffering effect on gas, and enable the entire system to maintain efficient operation under complex working conditions.

[0049] Reference Figure 9The locking assembly 8 includes a locking rod 81 that is slidably connected to the collection box 42. One end of the locking rod 81 is fixedly connected to the collection box 42 with a locking spring 82, and the other end of the locking rod 81 is fixedly connected to a limit plate 83.

[0050] Specifically, when it is necessary to disassemble the collection box 42, the user first squeezes the locking rod 81 towards the collection box 42. The locking rod 81 overcomes the elastic force of the locking spring 82 and slides into the collection box 42, causing the limiting plate 83 fixed to the other end of the locking rod 81 to move synchronously, so that the limiting plate 83 is disengaged from the limiting groove on the air outlet pipe 12. Then the user rotates the locking rod 81, causing the limiting plate 83 to rotate to a position that does not interfere with the disassembly path of the collection box 42. At this time, the collection box 42 can be removed from the air outlet pipe 12 for cleaning or replacement. During installation, first insert the collection box 42 into the installation position of the exhaust pipe 12. Rotate the locking rod 81 to align the limiting plate 83 with the limiting groove on the exhaust pipe 12. Release the locking rod 81, and the locking spring 82 will rebound, pushing the locking rod 81 outward to slide, causing the limiting plate 83 to engage in the limiting groove. Through the cooperation between the limiting plate 83 and the limiting groove, the collection box 42 is firmly locked onto the exhaust pipe 12, preventing it from loosening or falling off due to vibration or airflow impact during compressor operation. The remaining structure is the same as in Embodiment 2.

[0051] Based on embodiments 1-3, the working principle of this invention is as follows: When gas enters the outlet pipe 12, it first impacts the filter screen 25 of the primary buffer assembly 2, pushing it to move axially along the auger shaft 21 and compressing the buffer spring 24, absorbing some of the pulsating energy through spring deformation. Simultaneously, the rotating ring 31 of the rotating assembly 3 moves with the filter screen 25, its protrusion 33 sliding along the spiral groove 32, forcing the filter screen 25 to rotate, enhancing the filtration effect and further consuming pulsating energy through rotational resistance. During the rotation of the filter screen 25, the arc-shaped plate 41 of the cleaning assembly 4 rotates synchronously with the connecting shaft 23, scraping away impurities on the filter screen. The impurities are swept into the collection box 42 by the scraper 44, ensuring the filter screen remains clear. The slider 52 of the displacement assembly 5 slides within the groove 51, cooperating with the displacement spring 53 to ensure that the scraper 44 and the arc-shaped plate 41 always contact, improving cleaning efficiency. The fan blades 62 of the secondary buffer assembly 6 are driven by the airflow to rotate the auger shaft 21. The spiral structure of the auger blades 61 extends the gas flow path, achieving secondary buffering. The protective spring 71 of the protective component 7 provides cushioning when the connecting shaft 23 slides, preventing rigid collisions and extending component life. When the collection box 42 needs to be cleaned, the locking rod 81 is squeezed and rotated to disengage the limiting plate 83 from the limiting groove for removal. Through multi-stage buffering, dynamic filtration, automatic cleaning, and component protection, the gas pulsation problem is effectively solved, improving system stability, energy efficiency, and reliability, while reducing maintenance costs.

[0052] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. 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 be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A multi-stage centrifugal compressor for high-temperature heat pumps, comprising a compressor body (1), an inlet pipe (11) on one side of the compressor body (1), and an outlet pipe (12) on the other side of the compressor body (1), characterized in that: It also includes a buffer component installed on the air outlet pipe (12); The buffer component includes a primary buffer assembly (2) disposed on the air outlet pipe (12), and a rotating assembly (3) and a cleaning assembly (4) disposed on the primary buffer assembly (2). The buffer component is used to buffer the gas entering the outlet pipe (12); The primary buffer assembly (2) includes an auger shaft (21) disposed in the air outlet pipe (12), an active groove (22) disposed on the auger shaft (21), a connecting shaft (23) disposed in the active groove (22), a buffer spring (24) disposed between the connecting shaft (23) and the inner wall of the active groove (22), and a filter screen (25) disposed on the connecting shaft (23). The rotating assembly (3) includes a rotating ring (31) disposed on the filter screen (25), a spiral groove (32) disposed in the air outlet pipe (12), and a protrusion (33) disposed on the inner side of the spiral groove (32), the protrusion (33) being fixedly connected to the rotating ring (31); The cleaning assembly (4) includes an arc plate (41) on the connecting shaft (23), a collection box (42) on the air outlet pipe (12), a telescopic rod (43) on the collection box (42), a scraper (44) on one end of the telescopic rod (43), the scraper (44) abutting against the arc plate (41), and a telescopic spring (45) between the other end of the telescopic rod (43) and the collection box (42). The buffer component also includes a displacement component (5) disposed on the cleaning component (4), a secondary buffer component (6) and a protection component (7) disposed on the primary buffer component (2), and a locking component (8) disposed on the cleaning component (4). The displacement component (5) includes a groove (51) provided on the scraper (44), a slider (52) provided inside the groove (51), a displacement spring (53) provided between the slider (52) and the inner wall of the groove (51), and a telescopic rod (43) fixedly connected to the slider (52).

2. The multi-stage centrifugal compressor for high-temperature heat pumps according to claim 1, characterized in that: The secondary buffer assembly (6) includes an auger blade (61) disposed on the auger shaft (21), and a fan blade (62) is also disposed on the auger shaft (21).

3. The multi-stage centrifugal compressor for high-temperature heat pumps according to claim 1, characterized in that: The protective component (7) includes a protective spring (71) disposed on the connecting shaft (23), the protective spring (71) being rotatably connected to the auger shaft (21), and a fixing ring (72) disposed on the connecting shaft (23), the fixing ring (72) abutting against the protective spring (71).

4. The multi-stage centrifugal compressor for high-temperature heat pumps according to claim 1, characterized in that: The locking assembly (8) includes a locking rod (81) disposed on the collection box (42), a locking spring (82) disposed between one end of the locking rod (81) and the collection box (42), and a limit plate (83) disposed at the other end of the locking rod (81).

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