Multi-stage centrifugal compressor for high-temperature heat pump

Abstract

The invention relates to the technical field of compressors, and discloses a multi-stage centrifugal compressor for a high-temperature heat pump, which comprises a compressor body, an air inlet pipe is arranged on one side of the compressor body, an air outlet pipe is arranged on the other side of the compressor body, and the multi-stage centrifugal compressor further comprises a buffer component arranged on the air outlet pipe; the buffering component comprises a first-stage buffering assembly arranged on the air outlet pipe, and a rotating assembly and a cleaning assembly are arranged on the first-stage buffering assembly. According to the multi-stage centrifugal compressor for the high-temperature heat pump, through the synergistic effect of the first-stage buffer assembly, the second-stage buffer assembly, the displacement assembly and the like, the pressure pulsation amplitude of output gas is effectively reduced through the multi-stage centrifugal compressor for the high-temperature heat pump, and the impact of pressure fluctuation on downstream equipment is reduced. Therefore, abnormal action of pneumatic equipment caused by unstable pressure is avoided, the stability of product quality of a production line is guaranteed, equipment failure and shutdown maintenance caused by airflow pulsation are prevented, and the operation cycle of the whole system is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a multi-stage centrifugal compressor for a high-temperature heat pump. Background Art

[0002] As an efficient heat energy conversion device, high-temperature heat pumps can convert low-grade heat energy into high-grade heat energy. They are widely used in industrial waste heat recovery, district heating, building heating and other fields, and are of great significance to energy conservation and emission reduction. However, traditional high-temperature heat pumps are limited by the performance of the compressor and are unable to cope with high loads and high temperature rise requirements. Multi-stage centrifugal compressors achieve step-by-step pressurization of the working fluid through multi-stage series connection, breaking through the limitations of single-stage compression in pressure ratio and temperature rise, 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 heating in cities. Existing multi-stage centrifugal compressors still have the following defects when in use:

[0003] 1. The periodic or intermittent discharge of compressed gas from the compressor can cause significant system pressure fluctuations. This pressure instability directly affects the operating accuracy of back-end equipment. For example, in process scenarios requiring stable air pressure, fluctuating pressure can cause inaccurate operation of processing equipment, such as deviations in the opening and closing frequency or force of pneumatic valves, which in turn affects product quality consistency. Pressure fluctuations can also cause vibration in pipes and equipment. Long-term operation can lead to loose connections and wear of seals, increasing the risk of leakage and even shortening the overall service life of the equipment.

[0004] 2. When gas is discharged periodically, alternating high- and low-pressure areas form within the pipeline. This pulsation not only generates noise but also causes turbulent energy loss in pipe bends, valves, and other locations. 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 in the control system, further amplifying energy loss and equipment operation errors. Summary of the Invention

[0005] In view of the problems that the intermittent gas discharge in the existing technology will cause unstable operation of downstream equipment due to pressure fluctuations, such as abnormal operation of pneumatic equipment and affected product quality of production line; it will also aggravate the air flow pulsation loss, leading to energy loss, equipment wear and noise generation, and interfere with sensor signals, affecting the accuracy of the control system. A multi-stage centrifugal compressor for high-temperature heat pumps is proposed.

[0006] The present application provides a multi-stage centrifugal compressor for a high-temperature heat pump, 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 the accuracy of sensor signals, improve system control accuracy and overall operating efficiency.

[0007] The technical solution of the present invention is: a multi-stage centrifugal compressor for a high-temperature heat pump, comprising a compressor body, an air inlet pipe being provided on one side of the compressor body, an air outlet pipe being provided on the other side of the compressor body, and a buffer component being provided on the air outlet pipe;

[0008] The buffer component includes a first-level buffer assembly arranged on the air outlet pipe, and the first-level buffer assembly is provided with a rotating assembly and a cleaning assembly;

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

[0010] The first-level buffer component includes an auger shaft arranged in the air outlet pipe, a movable groove is provided on the auger shaft, a connecting shaft is provided in the movable groove, a buffer spring is provided between the connecting shaft and the inner wall of the movable groove, and a filter is provided on the connecting shaft.

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

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

[0013] Furthermore, the buffer component further includes a displacement component provided on the cleaning component, a secondary buffer component and a protection component are provided on the primary buffer component, and a locking component is provided on the cleaning component;

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

[0015] Furthermore, the secondary buffer assembly includes auger blades arranged on the auger shaft, and the auger shaft is also provided with fan blades.

[0016] Furthermore, the protection component includes a protection spring arranged on the connecting shaft, the protection spring is rotatably connected to the auger shaft, and a fixing ring is also provided on the connecting shaft, and the fixing ring abuts against the protection spring.

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

[0018] Beneficial effects of the present invention:

[0019] 1. Through the synergistic effects of the primary and secondary buffer components and displacement assembly, the high-temperature heat pump multi-stage centrifugal compressor effectively reduces the pressure pulsation amplitude of the output gas, reducing the impact of pressure fluctuations on downstream equipment. This prevents malfunctions of pneumatic equipment caused by unstable pressure, ensures the stability of product quality on the production line, prevents equipment failures and downtime for maintenance caused by airflow pulsation, and extends the operating cycle of the entire system. Furthermore, the coordination of the cleaning assembly and locking assembly ensures timely removal of impurities and secure installation of the collection box, preventing impurities from clogging the pipes and affecting airflow. This comprehensively improves system reliability and reduces production losses caused by unexpected failures.

[0020] 2. The gas's own kinetic energy drives the fan blades, auger blades, and other components to achieve buffering and cleaning functions, eliminating the need for an additional power source and reducing energy consumption. Furthermore, by effectively suppressing airflow pulsation losses, turbulent energy loss within the pipeline is reduced, improving system energy efficiency. Furthermore, stable airflow output reduces equipment vibration and noise, improving the working environment. The long-life design of components reduces replacement frequency and waste generation, achieving both energy conservation and environmental benefits, in line with the concept of sustainable development.

[0021] 3. The cleaning assembly scrapes impurities from the filter in real time, preventing clogging and reducing the frequency and difficulty of manual cleaning. The protective assembly provides cushioning protection for key components, extending the service life of core components such as the connecting shaft and auger shaft, and reducing component replacement costs. The locking assembly's convenient collection box assembly and disassembly make cleaning easier and more efficient, allowing maintenance personnel to complete impurity removal without complex operations. The overall structure optimizes the maintenance process, reduces maintenance time and labor costs, minimizes the impact of maintenance downtime on production schedules, and improves enterprise production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

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

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

[0025] Figure 4 This is a schematic structural diagram of a primary buffer assembly according to the present invention;

[0026] Figure 5 It is a schematic structural diagram of the rotating assembly of the present invention;

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

[0028] Figure 7 It is a schematic structural diagram of the displacement assembly of the present invention;

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

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

[0031] Figure 10 It is a schematic structural diagram of the locking assembly of the present invention.

[0032] In the picture:

[0033] 1. Compressor body; 11. Inlet pipe; 12. Outlet pipe; 2. Primary buffer assembly; 21. Auger shaft; 22. Movable groove; 23. Connecting shaft; 24. Buffer spring; 25. Filter; 3. Rotating assembly; 31. Rotating ring; 32. Spiral groove; 33. Protrusion; 4. Cleaning assembly; 41. Arc plate; 42. Collecting 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. Auger blade; 62. Fan blade; 7. Protection assembly; 71. Protection spring; 72. Fixed ring; 8. Locking assembly; 81. Locking rod; 82. Locking spring; 83. Limit plate. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0035] Example 1, with reference to Figures 1-6, which is the first embodiment of the present invention, provides a multi-stage centrifugal compressor for a high-temperature heat pump, including a compressor body 1, one side of the compressor body 1 is fixedly connected to an air inlet pipe 11, the other side of the compressor body 1 is fixedly connected to an air outlet pipe 12, and also includes a buffer component installed on the air outlet pipe 12; the buffer component includes a first-level buffer assembly 2 installed on the air outlet pipe 12, and the first-level buffer assembly 2 is installed with a rotating assembly 3 and a cleaning assembly 4; the buffer component is used to buffer the gas entering the air outlet pipe 12; the first-level buffer assembly 2 includes an auger shaft 21 rotatably connected to the air outlet pipe 12, a movable groove 22 is provided on the auger shaft 21, and a connecting shaft 23 is slidingly 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, when the compressor body 1 is in operation, external gas enters the compressor body 1 from the air inlet pipe 11. The gas first enters the center of the first-stage impeller. The high-speed rotation of the impeller generates centrifugal force, which accelerates the gas and flows radially, converting it into kinetic energy and pressure energy. After the gas enters the diffuser, the cross-sectional area of the channel increases, the flow rate decreases, and the kinetic energy is converted into pressure energy, further increasing the gas pressure. The gas passing through the diffuser changes direction through the bend and the return flow device and enters the center of the next-stage impeller, repeating the above compression process. Each stage of compression increases the pressure and temperature of the gas. After multiple stages of compression, the gas finally reaches the required pressure and is discharged through the volute and the outlet pipe 12. However, since the process of suction and compression and exhaust is essentially periodic and intermittent, the output compressed gas inevitably shows periodic fluctuations in flow rate and pressure. This fluctuation can easily cause pressure pulsation in the transmission pipeline. The gas in the outlet pipe 12 is buffered by the buffer component to solve the problem that intermittent gas discharge will cause downstream equipment to operate unstably due to pressure fluctuations, such as abnormal operation of pneumatic equipment and affected product quality of production line; it will also aggravate air flow pulsation loss, leading to 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 25. The gas entering the outlet pipe 12 will push the filter 25 to move, and the buffer spring 24 is squeezed through the connecting shaft 23. Under the action of the buffer spring 24, the movement of the filter 25 is buffered, thereby providing a first-level buffer for the compressed gas entering the outlet pipe 12. Moreover, the filter 25 can rotate when moving, making it difficult for the compressed gas to pass through the mesh of the filter 25, further improving the filtering and buffering effect of the filter 25 on the gas. The elastic deformation of the buffer spring 24 absorbs the pressure fluctuations during the periodic discharge of the gas, avoiding abnormal operation of the downstream pipeline due to sudden pressure changes. It suppresses the turbulent energy loss caused by air flow pulsation, reduces the kinetic energy loss at the pipe bends and valves, and improves the energy efficiency of the system. It weakens the periodic impact of the pulsating air flow on the inner wall of the pipeline and equipment, reduces the risk of metal fatigue damage, and suppresses the generation of air flow noise.

[0038] Reference Figure 4 and Figure 5 The rotating assembly 3 includes a rotating ring 31 unidirectionally connected to the filter screen 25 , a spiral groove 32 provided in the outlet pipe 12 , a protrusion 33 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 25 to move axially, and the rotating ring 31 moves synchronously with the filter 25. Since the rotating ring 31 cooperates 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 drive the filter 25 to rotate around the center of the auger shaft 21, so that the filter 25 produces a dynamic filtering effect when buffering the airflow, avoiding the accumulation of impurities in a single area to extend the life of the filter; the gas pressure fluctuation causes the axial displacement of the filter 25 to change with the airflow intensity. During the compression and rebound of the buffer spring 24, the rotating component 3 causes the filter 25 to rotate continuously. The gas needs to overcome the rotation resistance of the filter to pass through, further consuming the pulsating energy to enhance the buffering effect, and the rotation makes all areas of the filter surface evenly bear the impact of the airflow, 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 25, the filter 25 does not rotate during the reset process, avoiding interference with the cleaning component 4. When the filter 25 rotates, the cleaning component 4 acts synchronously to scrape off impurities on the filter and guide them to the slag discharge port, preventing the filter from being blocked, ensuring smooth gas flow and maintaining long-term stable operation of the system; the rotating component 3 and the cleaning component 4 thereby significantly improve the stability of the compressor outlet gas, reduce the impact of pressure pulsation on downstream equipment, and at the same time extend the filter life and reduce system maintenance costs through self-cleaning and dynamic filtration.

[0040] Example 2, reference Figure 6, which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: the cleaning component 4 includes a curved plate 41 fixedly connected to the connecting shaft 23, a collecting box 42 is inserted into the air outlet pipe 12, a telescopic rod 43 is slidably connected to the collecting box 42, one end of the telescopic rod 43 is fixedly connected to a scraper 44, the scraper 44 is in contact with the curved plate 41, and a telescopic spring 45 is fixedly connected between the other end of the telescopic rod 43 and the collecting box 42.

[0041] Specifically, the filter 25 moves and rotates axially along the auger shaft 21 under the push of the airflow, intercepting impurities in the gas. The connecting shaft 23 rotates, driving the curved plate 41 to rotate synchronously with it. Its edge is in close contact with the surface of the filter 25. During the rotation, impurities attached to the surface of the filter are scraped off, preventing the filter from clogging and affecting the filtering and buffering effects. The impurities scraped off by the curved plate 41 will adhere to its surface. At this time, the scraper 44 abutting the curved plate 41 comes into play. Under the elastic force of the telescopic spring 45, it always adheres to the surface of the curved plate 41. As the curved plate 41 moves, the scraper 44 slides along the telescopic rod 43, scraping impurities on the curved plate 41 and sweeping them into the collection box 42. This dual cleaning structure, on the one hand, ensures that the filter 25 continues to filter efficiently and maintains stable gas buffering performance; on the other hand, it prevents impurities from accumulating in the outlet pipe 12, reduces airflow resistance, reduces equipment wear, and extends the overall service life of the compressor. At the same time, it reduces the frequency of manual cleaning and improves the economic efficiency and reliability of system operation.

[0042] Reference Figure 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 are installed on the primary buffer component 2, and a locking component 8 is installed on the cleaning component 4;

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

[0044] Specifically, the filter 25 undergoes axial displacement under fluctuations in airflow pressure, driving the curved plate 41 fixed to the connecting shaft 23 to move synchronously. At this time, the telescopic rod 43 pushes the scraper 44 by connecting with the slider 52. The slider 52 slides within the chute 51 within a limited position and is constrained by the displacement spring 53, causing the scraper 44 to move synchronously with the curved plate 41. The buffering force provided by the displacement spring 53 ensures that the scraper 44 and the curved plate 41 always remain in contact. When the filter 25 moves in the opposite direction, the displacement assembly 5 can still ensure the dynamic synchronization of the scraper 44 and the curved plate 41. Through elastic linkage, the scraper 44 and the curved plate 41 can follow each other seamlessly, improving the impurity removal efficiency and ensuring the transparency of the filter 25. The remaining structure is the same as that of Example 1.

[0045] Example 3, reference Figure 8 , which is the third embodiment of the present invention, is different from the second embodiment in that the secondary buffer assembly 6 includes an auger blade 61 fixedly sleeved on the auger shaft 21, and the auger shaft 21 is also fixedly sleeved with a fan blade 62.

[0046] Specifically, the gas is discharged from the outlet pipe 12, and the high-speed airflow directly impacts the fan blades 62, which are driven to rotate rapidly by the impact force of the gas. Since the fan blades 62 are fixedly mounted on the auger shaft 21, they drive the auger shaft 21 to rotate synchronously, thereby causing the auger blades 61 fixedly mounted on the auger shaft 21 to rotate accordingly. The spiral structure of the auger blades 61 generates an axial thrust on the gas, disrupting the original pulsation rhythm of the gas, extending the flow path of the gas in the outlet pipe 12, consuming the pulsation energy of the gas through friction and diversion, and achieving secondary buffering of the airflow. It not only effectively reduces the pressure fluctuation during gas discharge, ensuring the stable operation of downstream equipment, but also reduces pipeline vibration and noise through dynamic buffering; it uses the gas's own kinetic energy to drive the buffer components, without the need for additional energy, saving energy and protecting the environment; and comprehensively enhances the reliability and operating efficiency of the high-temperature heat pump system.

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

[0048] Specifically, the fluctuation of airflow pressure causes the filter 25 to produce axial displacement, driving the connecting shaft 23 to slide in the movable groove 22 of the auger shaft 21. At this time, one end of the protective spring 71 mounted on the connecting shaft 23 is rotationally connected to the auger shaft 21, and the other end abuts the fixed ring 72. When the connecting shaft 23 moves axially, the fixed ring 72 compresses the protective spring 71, and the spring generates a reverse elastic force to buffer the impact load, thereby avoiding a rigid collision between the connecting shaft 23 and the auger shaft 21. If the sudden change in airflow pressure causes the filter 25 to displace rapidly, the elastic deformation of the protective spring 71 can absorb the instantaneous energy and reduce the peak impact force. When the airflow returns to stability, the protective spring 71 rebounds and pushes the fixed ring 72 to reset, ensuring the smooth sliding of the connecting shaft 23 in the movable groove 22. It not only extends the service life of the connecting shaft 23 and the auger shaft 21 and reduces the maintenance frequency, but also reduces the system vibration and noise by buffering the impact, thereby improving the stability of the equipment operation; in addition, the preload force of the protective spring 71 can optimize the axial displacement characteristics of the filter screen 25, enhance its buffering effect on the 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 slidably connected to the collection box 42 , a locking spring 82 is fixedly connected between one end of the locking rod 81 and the collection box 42 , and the other end of the locking rod 81 is fixedly connected to a limiting plate 83 .

[0050] Specifically, when the collection box 42 needs to be disassembled, the user first squeezes the locking rod 81 toward the collection box 42. The locking rod 81 overcomes the elastic force of the locking spring 82 and slides toward the inside of the collection box 42, driving the limiting plate 83 fixed at 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, driving 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 outlet pipe 12, rotate the locking rod 81 so that the limiting plate 83 is aligned with the limiting groove on the outlet pipe 12, and release the locking rod 81. The locking spring 82 rebounds and pushes the locking rod 81 to slide outward, driving the limiting plate 83 to engage with the limiting groove. The limiting plate 83 cooperates with the limiting groove to firmly lock the collection box 42 on the outlet 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 that of Example 2.

[0051] Based on Examples 1-3, the working principle of the present invention is as follows: When gas enters the outlet pipe 12, it first impacts the filter screen 25 of the first-level buffer assembly 2, pushing it to move axially along the auger shaft 21 and compressing the buffer spring 24, absorbing part of the pulsating energy through spring deformation. At the same time, the rotating ring 31 of the rotating assembly 3 moves with the filter screen 25, and its protrusion 33 slides along the spiral groove 32, forcing the filter screen 25 to rotate, which not only enhances the filtering effect but also further consumes the pulsating energy through rotational resistance. During the rotation of the filter screen 25, the curved plate 41 of the cleaning assembly 4 rotates synchronously with the connecting shaft 23, scraping off impurities on the filter screen. The impurities are swept into the collection box 42 by the scraper 44 to ensure the transparency of the filter screen. The slider 52 of the displacement assembly 5 slides in the slide groove 51, and cooperates with the displacement spring 53 to ensure that the scraper 44 and the curved plate 41 are always in contact, thereby improving the cleaning efficiency. The fan blade 62 of the secondary buffer assembly 6 is driven by the airflow to rotate the auger shaft 21. The spiral structure of the auger blade 61 extends the gas flow path to achieve secondary buffering. The protective spring 71 of the protective assembly 7 provides cushioning when the connecting shaft 23 slides, preventing rigid collisions and extending component life. To clean the collection box 42, simply squeeze and rotate the locking lever 81 to disengage the retaining plate 83 from the retaining groove for removal. This multi-stage buffering, dynamic filtration, automatic cleaning, and component protection effectively address gas pulsation issues, 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 the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A multi-stage centrifugal compressor for a high-temperature heat pump, comprising a compressor body (1), an air inlet pipe (11) being provided on one side of the compressor body (1), and an air outlet pipe (12) being provided on the other side of the compressor body (1), characterized in that: Also included is a buffer component provided on the air outlet pipe (12); The buffer component comprises a primary buffer assembly (2) arranged on the air outlet pipe (12), and a rotating assembly (3) and a cleaning assembly (4) are arranged on the primary buffer assembly (2); The buffer component is used to buffer the gas entering the gas outlet pipe (12); The primary buffer assembly (2) comprises an auger shaft (21) arranged in the air outlet pipe (12), a movable groove (22) being provided on the auger shaft (21), a connecting shaft (23) being provided in the movable groove (22), a buffer spring (24) being provided between the connecting shaft (23) and the inner wall of the movable groove (22), and a filter screen (25) being provided on the connecting shaft (23).

2. The multi-stage centrifugal compressor for a high-temperature heat pump according to claim 1, characterized in that: The rotating assembly (3) comprises a rotating ring (31) arranged on the filter screen (25), a spiral groove (32) arranged in the air outlet pipe (12), a protrusion (33) arranged on the inner side of the spiral groove (32), and the protrusion (33) is fixedly connected to the rotating ring (31).

3. The multi-stage centrifugal compressor for a high-temperature heat pump according to claim 1, characterized in that: The cleaning assembly (4) comprises an arc-shaped plate (41) arranged on the connecting shaft (23), a collecting box (42) arranged on the air outlet pipe (12), a telescopic rod (43) arranged on the collecting box (42), a scraper (44) arranged at one end of the telescopic rod (43), the scraper (44) abutting against the arc-shaped plate (41), and a telescopic spring (45) arranged between the other end of the telescopic rod (43) and the collecting box (42).

4. The multi-stage centrifugal compressor for a high-temperature heat pump according to claim 3, characterized in that: The buffer component further comprises a displacement component (5) arranged on the cleaning component (4), a secondary buffer component (6) and a protection component (7) are arranged on the primary buffer component (2), and a locking component (8) is arranged on the cleaning component (4); The displacement assembly (5) comprises a slide groove (51) arranged on the scraper (44), a slider (52) is arranged inside the slide groove (51), a displacement spring (53) is arranged between the slider (52) and the inner wall of the slide groove (51), and the telescopic rod (43) is fixedly connected to the slider (52).

5. The multi-stage centrifugal compressor for a high-temperature heat pump according to claim 4, characterized in that: The secondary buffer assembly (6) comprises an auger blade (61) arranged on the auger shaft (21), and a fan blade (62) is also arranged on the auger shaft (21).

6. The multi-stage centrifugal compressor for a high-temperature heat pump according to claim 4, characterized in that: The protection assembly (7) includes a protection spring (71) arranged on the connecting shaft (23), the protection spring (71) being rotatably connected to the auger shaft (21), and a fixing ring (72) being further arranged on the connecting shaft (23), the fixing ring (72) being in contact with the protection spring (71).

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

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