Shafting mechanism and compressor having the same

Abstract

The utility model provides a kind of shafting mechanism and the compressor with it, shafting mechanism, comprising: shaft, shaft is equipped with impeller component and shell component, pressure regulating cavity is arranged between impeller component and shell component;Medium flow passage, it is arranged in shaft, one end of medium flow passage is communicated with medium source, other end is communicated with pressure regulating cavity, the pressure of pressure regulating medium that medium flow passage is passed into pressure regulating cavity is adjusted, to adjust the pressure that shell component and impeller component are subjected to, the present application solves the problem that the bearing failure of centrifugal compressor's rotor axial force in prior art is too large, and the service life of compressor reduces.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal compressor technology, and more specifically, to a shaft system mechanism and a compressor having the same. Background Technology

[0002] In the field of centrifugal compressor technology, the problem of axial force balance has always been a challenge. During compressor operation, gas flows from the low-pressure side to the high-pressure side, creating a pressure difference on both sides of the impeller. At the same time, high-pressure gas leaks from the impeller back plate and diaphragm to the low-pressure side, and together they generate an axial thrust pointing towards the inlet.

[0003] Excessive axial force can cause overload and wear of the thrust bearing, which in severe cases can lead to bearing failure, rotor axial movement, impeller-casing collision, seal damage, and even equipment shutdown, threatening operational safety and equipment lifespan. Utility Model Content

[0004] The main purpose of this utility model is to provide a shaft system mechanism and a compressor having the same, so as to solve the problem that excessive axial force on the rotor of the centrifugal compressor in the prior art leads to bearing failure and reduced compressor service life.

[0005] To achieve the above objectives, according to one aspect of the present invention, a shaft system mechanism is provided, comprising: a rotating shaft, on which an impeller component and a housing component are sleeved, and a pressure regulating chamber is provided between the impeller component and the housing component; a medium flow channel disposed within the rotating shaft, one end of the medium flow channel being connected to a medium source and the other end being connected to the pressure regulating chamber, wherein the pressure of the pressure regulating medium introduced into the pressure regulating chamber through the medium flow channel is adjusted to regulate the pressure on the housing component and the impeller component.

[0006] Furthermore, the medium flow channel includes: a first channel section extending along the axial direction of the rotating shaft; a second channel section communicating with the first channel section, wherein the extension direction of the second channel section is set at an angle to the extension direction of the first channel section, the first channel section communicating with the medium source, and the second channel section communicating with the pressure regulating chamber.

[0007] Furthermore, there are multiple second channel segments, which are spaced apart along the circumferential direction of the rotation axis, and each second channel segment is connected to the first channel segment.

[0008] Furthermore, the total cross-sectional area of ​​the flow sections of each second channel segment is equal to the cross-sectional area of ​​the flow section of the first channel segment.

[0009] Furthermore, the inner diameter of the first channel section is 1 / 8 to 1 / 10 of the maximum outer diameter of the shaft.

[0010] Furthermore, the impeller component includes a back plate, and the housing component is provided with a concave wall surface. At least a portion of the back plate is in contact with the concave wall surface, and a pressure regulating cavity is disposed between the back plate and the concave wall surface. The back plate is provided with a first sealing part, and at least a portion of the first sealing part is in contact with the concave wall surface to seal the pressure regulating cavity.

[0011] Furthermore, the first sealing part includes: a plurality of first protrusions, the plurality of first protrusions being spaced apart on the back plate, each first protrusion being respectively in contact with the inner concave wall surface, and each first protrusion having a first groove on its side, so that after the pressure regulating medium in the pressure regulating cavity leaks into the first groove, the flow rate is reduced.

[0012] Furthermore, the shaft system also includes: an end cover, which is installed on the end of the shaft away from the impeller component, and a second sealing part is provided on the end cover. The second sealing part extends along the circumferential direction of the end cover, and at least a portion of the second sealing part is in contact with the axial side surface of the shaft. The end cover is also provided with a through-passing channel for passing through a connecting pipe, and the medium flow channel is connected to the medium source through the connecting pipe.

[0013] Furthermore, the second sealing part includes: a plurality of second protrusions, the plurality of second protrusions being spaced apart along the axial direction of the end cover, and a second groove being provided on the side of each second protrusion, so that after the pressure regulating medium between the end cover and the rotating shaft leaks into the second groove, the flow rate is reduced.

[0014] According to another aspect of the present invention, a compressor is provided, including a body and a shaft system mechanism, wherein the shaft system mechanism is disposed in the body and is the shaft system mechanism described above.

[0015] Applying the technical solution of this utility model, the shaft mechanism provided in this application includes internal media flow channels. One end of these channels is connected to an external media source, which can be low-pressure refrigerant from the evaporator or other pressure-regulating media, while the other end is directly connected to the pressure regulating chamber. This design allows the media to flow freely inside, thereby regulating the pressure within the pressure regulating chamber.

[0016] By adjusting the pressure of the regulating medium in real time during compressor operation, the magnitude and direction of the axial force can be effectively controlled, avoiding a series of problems caused by excessive axial force, such as thrust bearing wear, rotor axial movement, and impeller-casing collision, thus significantly improving the safety and stability of the equipment.

[0017] It reduces leakage of high-pressure gas from the rear of the impeller to the low-pressure side, optimizes the distribution of airflow inside the compressor, reduces energy waste, and improves the overall efficiency of the compressor.

[0018] The medium pressure can be flexibly adjusted according to different operating conditions (such as low flow rate and high pressure ratio), so that the compressor can maintain the best operating condition under various conditions, thus enhancing the adaptability of the equipment.

[0019] By effectively controlling the axial force, the stress on various components of the equipment is reduced, excessive wear and potential failure risks are avoided, and the service life of the compressor is extended. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0021] Figure 1 A schematic diagram of an embodiment of the shafting mechanism according to the present invention is shown;

[0022] Figure 2 It shows Figure 1 Enlarged view of section B;

[0023] Figure 3 A schematic diagram of the structure of the rotating shaft in the shaft system mechanism according to the present invention is shown;

[0024] Figure 4 It shows Figure 3 Enlarged view of section A;

[0025] Figure 5 A schematic diagram of the fit between the end cap and the rotating shaft in the shaft system mechanism according to the present invention is shown.

[0026] The above figures include the following reference numerals:

[0027] 100. Shaft; 110. Impeller assembly; 111. Back plate; 1111. First plate; 1112. Second plate; 120. Housing assembly; 121. Concave wall surface; 122. Housing; 123. Diffuser assembly; 130. Pressure regulating chamber; 140. First sealing part; 141. First protrusion; 142. First groove;

[0028] 200. Medium flow channel; 210. First channel section; 220. Second channel section;

[0029] 300. End cap; 310. Second sealing part; 311. Second protrusion; 312. Second groove; 320. Through-hole;

[0030] 400. Connecting pipe fittings; 500. Bearings. Detailed Implementation

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] As mentioned in the background section, the axial force in existing centrifugal compressors is mainly generated by the gas pressure difference across the impeller and leakage gas flow. Gas flows from the impeller inlet (low-pressure side) to the outlet (high-pressure side), and high-pressure gas leaks from the gap between the impeller back plate and the diaphragm to the low-pressure side, collectively forming an axial thrust pointing towards the inlet. The axial force accumulates and increases with the number of compressor stages; it is significantly enhanced under low flow rate and high pressure ratio conditions. Excessive axial force leads to overload wear of the thrust bearing, and in severe cases, causes bearing failure, rotor axial movement, impeller-casing collision, seal damage, and even equipment shutdown, threatening operational safety and equipment lifespan. Therefore, to address the aforementioned technical problems, the shaft system mechanism provided in this application includes a pressure regulating chamber 130 between the impeller component 110 and the housing component 120. A medium flow channel 200 is provided within the rotating shaft 100, with one end connected to a medium source and the other end connected to the pressure regulating chamber 130. By adjusting the pressure of the regulating medium flowing through the medium flow channel 200 into the pressure regulating chamber 130, the pressure on the housing component 120 and the impeller component 110 can be adjusted. By precisely controlling the pressure of the regulating medium flowing from the medium source into the pressure regulating chamber 130, the pressure difference between the impeller component 110 and the housing component 120 can be adjusted in real time, thereby dynamically balancing the axial force. This avoids thrust bearing overload, reduces bearing wear and potential failure risks, helps prevent rotor axial movement, avoids impeller-hoisting collisions and seal damage, reduces internal mechanical stress, and avoids frequent start-ups and shutdowns, thus extending the service life of the compressor and its key components.

[0033] Please refer to Figures 1 to 5 This application provides a shaft system mechanism, including: a rotating shaft 100, on which an impeller component 110 and a housing component 120 are sleeved, and a pressure regulating chamber 130 is provided between the impeller component 110 and the housing component 120; a medium flow channel 200, which is disposed inside the rotating shaft 100, one end of the medium flow channel 200 is connected to a medium source, and the other end is connected to the pressure regulating chamber 130. The pressure of the pressure regulating medium introduced into the pressure regulating chamber 130 through the medium flow channel 200 is adjusted to regulate the pressure on the housing component 120 and the impeller component 110.

[0034] According to the shaft system mechanism provided in this application, the rotating shaft 100 is internally designed with medium flow channels 200. One end of these channels is connected to an external medium source, which may be a low-pressure refrigerant or other pressure-regulating medium from the evaporator, while the other end is directly connected to the pressure regulating chamber 130. This design allows the medium to flow freely inside, thereby regulating the pressure within the pressure regulating chamber 130.

[0035] By adjusting the pressure of the regulating medium in real time during compressor operation, the magnitude and direction of the axial force can be effectively controlled, avoiding a series of problems caused by excessive axial force, such as thrust bearing wear, rotor axial movement, and impeller-casing collision, thus significantly improving the safety and stability of the equipment.

[0036] It reduces leakage of high-pressure gas from the rear of the impeller to the low-pressure side, optimizes the distribution of airflow inside the compressor, reduces energy waste, and improves the overall efficiency of the compressor.

[0037] The medium pressure can be flexibly adjusted according to different operating conditions (such as low flow rate and high pressure ratio), so that the compressor can maintain the best operating condition under various conditions, thus enhancing the adaptability of the equipment.

[0038] By effectively controlling the axial force, the stress on various components of the equipment is reduced, excessive wear and potential failure risks are avoided, and the service life of the compressor is extended.

[0039] The process of delivering the pressure regulating medium to the pressure regulating chamber 130 through the medium flow channel 200 requires precise control. Therefore, an electronic regulating valve is installed on the input pipeline to dynamically adjust the pressure and flow rate of the medium according to the actual operating conditions of the compressor.

[0040] The housing component 120 includes a housing 122 and a diffuser component 123. The diffuser component 123 is disposed on the housing 122. The pressure regulating chamber 130 is disposed between the diffuser component 123 and the back plate 111. A bearing 500 is disposed between the rotating shaft 100 and the housing 122.

[0041] Specifically, such as Figure 3 As shown, the medium flow channel 200 includes: a first channel section 210 extending along the axial direction of the rotating shaft 100; and a second channel section 220 communicating with the first channel section 210. The extension direction of the second channel section 220 is set at an angle to the extension direction of the first channel section 210. The first channel section 210 is communicating with the medium source, and the second channel section 220 is communicating with the pressure regulating chamber 130.

[0042] The first channel section 210 is parallel to the axis of the rotating shaft 100. Its main function is to introduce pressure regulating medium, such as low-pressure refrigerant, from an external medium source to provide the necessary material basis for subsequent axial force regulation. The second channel section 220 is seamlessly connected to the first channel section 210, forming a complete medium flow path from the medium source to the pressure regulating chamber 130.

[0043] The second channel section 220 is not collinear with the first channel section 210, but deviates from the axis at a certain angle. The purpose of this design is to ensure that the medium can be evenly distributed to all areas within the pressure regulating chamber 130, avoiding excessively high or low local pressure, thereby achieving more balanced axial force regulation.

[0044] The first channel section 210 is connected to an external medium source and is responsible for the introduction of the medium and initial pressure control; the second channel section 220 is responsible for guiding the medium inside the rotating shaft and finally distributing it to the pressure regulating chamber 130. The two work together to achieve precise adjustment of the axial force.

[0045] Through precise control of the first channel section 210 and the second channel section 220, the uniformity and controllability of the pressure in the pressure regulating chamber 130 are ensured, thereby achieving precise adjustment of the axial force and effectively preventing excessive axial force from damaging the compressor.

[0046] In the specific implementation process, there are multiple second channel segments 220, which are spaced apart along the circumferential direction of the rotating shaft 100, and each second channel segment 220 is connected to the first channel segment 210.

[0047] In the specific implementation process, the second channel section 220 is designed as multiple sections, which are distributed at intervals along the circumferential direction of the rotating shaft 100 and are connected to the first channel section 210 respectively. This design further enhances the uniform distribution of medium pressure and ensures the pressure balance within the pressure regulating chamber 130, thereby achieving more precise and stable axial force regulation.

[0048] In the circumferential direction, multiple second channel segments 220 are distributed at equal intervals or at unequal intervals designed according to a specific pressure distribution model to ensure that the medium is delivered to the pressure regulating chamber 130 from different directions and to avoid local pressure unevenness.

[0049] The end of each second channel segment 220 is connected to the pressure regulating chamber 130 through an oblique hole. The layout, diameter, and number of oblique holes need to be optimized according to the specific dimensions and performance requirements of the shaft to ensure that the pressure in the pressure regulating chamber 130 can be increased uniformly when the medium flows through the oblique holes, without affecting the balance and strength of the shaft.

[0050] Uniform pressure regulation achieved through multi-channel segment design reduces the risk of bearing wear and rotor displacement caused by sudden changes in axial force, extends the service life of key components such as bearings and rotors, and also reduces equipment maintenance and repair costs.

[0051] The total cross-sectional area of ​​the flow sections of each second channel segment 220 is equal to the cross-sectional area of ​​the flow section of the first channel segment 210.

[0052] The total cross-sectional area of ​​all the oblique holes in the second channel section 220 is equal to the cross-sectional area of ​​the central hole in the first channel section 210. This matching principle ensures that the pressure regulating medium introduced from the medium source can flow into the pressure regulating chamber 130 without obstruction or loss, avoiding regulation deviations caused by pressure imbalance or uneven flow.

[0053] The number and diameter of the oblique holes determine the total flow cross-sectional area of ​​the second channel section 220. Selecting an appropriate number and diameter is key to achieving the above matching principle. The diameter of the oblique holes should not be too large to avoid affecting the strength and rigidity of the rotating shaft 100; at the same time, the number of oblique holes needs to be sufficient to ensure that the medium can be evenly distributed in the pressure regulating chamber 130 to achieve a balanced pressure regulating effect.

[0054] The inner diameter of the first channel section 210 is 1 / 8 to 1 / 10 of the maximum outer diameter of the rotating shaft 100.

[0055] If the inner diameter of the first channel section 210 is designed to be too large, although it is conducive to the rapid flow of the medium, it may cause unnecessary flow loss and energy efficiency reduction; if the inner diameter is designed to be too small, it will increase the resistance to the flow of the medium, affecting the efficiency and effect of pressure regulation. A ratio of 1 / 8 to 1 / 10 of the maximum outer diameter balances the relationship between the flow rate and resistance of the medium, ensuring efficient flow of the medium.

[0056] The strength and rigidity of the shaft 100 are directly related to the operational stability of the compressor. The inner diameter design of the first channel section 210 must ensure that the shaft can withstand axial force without reducing its structural strength due to excessively large openings. An opening ratio of 1 / 8 to 1 / 10 satisfies the medium flow requirements while retaining sufficient shaft material, thus improving the stability of the shaft system.

[0057] Furthermore, such as Figure 1 and Figure 2 As shown, the impeller component 110 includes a back plate 111, and the housing component 120 is provided with a concave wall surface 121. At least a portion of the back plate 111 is in contact with the concave wall surface 121, and a pressure regulating cavity 130 is disposed between the back plate 111 and the concave wall surface 121. The back plate 111 is provided with a first sealing part 140, and at least a portion of the first sealing part 140 is in contact with the concave wall surface 121 to seal the pressure regulating cavity 130.

[0058] The gap between the back plate 111 and the concave wall surface 121 forms the pressure regulating cavity 130. The size and shape of this cavity directly affect the pressure regulation effect. By adjusting the pressure inside the cavity, the axial force on the impeller component 110 can be effectively controlled, thereby achieving axial force balance.

[0059] The first sealing part 140 is disposed on the back plate 111 and at least partially fits against the concave wall surface 121 to form a sealing interface, thereby ensuring the sealing performance of the pressure regulating cavity 130.

[0060] The back plate 111 includes a first plate 1111 and a second plate 1112 connected to each other. The first plate 1111 extends in the radial direction of the impeller component 110, and the second plate 1112 extends in the axial direction of the impeller component 110. The first sealing part 140 is disposed on the second plate 1112. The concave wall surface 121 includes a first wall surface and a second wall surface connected to each other. The first plate 1111 is disposed opposite to the first wall surface, and at least a portion of the second plate 1112 is attached to the second wall surface.

[0061] The first sealing part 140 includes: a plurality of first protrusions 141, which are spaced apart on the back plate 111. Each first protrusion 141 is respectively attached to the inner concave wall surface 121. Each first protrusion 141 has a first groove 142 on its side, so that the pressure regulating medium in the pressure regulating cavity 130 leaks into the first groove 142 and reduces the flow rate.

[0062] On the back plate 111 of the impeller component 110, there are multiple spaced-apart first protrusions 141. These protrusions fit tightly against the inner concave wall surface 121 of the housing component 120, forming a comb-like sealing structure, which effectively reduces the leakage path of the medium and improves the sealing efficiency.

[0063] A first groove 142 is provided on the side of the first protrusion 141. Its main function is to serve as a temporary storage and flow rate regulation space for the pressure regulating medium. When the pressure regulating medium in the pressure regulating chamber 130 attempts to leak due to pressure difference, the first groove 142 can temporarily accommodate this part of the medium. At the same time, by increasing the flow path and contact area of ​​the medium, it reduces its leakage flow rate, thereby further improving the sealing effect.

[0064] By tightly fitting the first protrusion 141 with the concave wall surface 121 and reducing the flow rate of the leaking medium by the first groove 142, the first sealing part 140 significantly improves the sealing effect between the impeller component 110 and the housing component 120, effectively controls the leakage of the pressure regulating medium, and ensures the pressure stability in the pressure regulating chamber 130.

[0065] In the embodiments provided in this application, the shaft system mechanism further includes: an end cover 300, which covers the end of the rotating shaft 100 away from the impeller component 110; a second sealing part 310 is provided on the end cover 300, the second sealing part 310 extends along the circumferential direction of the end cover 300, and at least a portion of the second sealing part 310 is in contact with the axial side surface of the rotating shaft 100; wherein, the end cover 300 is also provided with a through channel 320, the through channel 320 is used to pass through the connecting pipe 400, and the medium flow channel 200 is connected to the medium source through the connecting pipe 400.

[0066] The end cap 300 is fixed to the end of the shaft 100 away from the impeller component 110, serving as a seal and support, while also providing an interface for connection to the internal medium flow channel 200 of the shaft.

[0067] A second sealing part 310 is provided on the end cover 300. This part extends circumferentially along the end cover and fits tightly against the axial side surface of the rotating shaft 100 to form an effective seal, preventing external media or environmental factors from interfering with the internal pressure regulation process and maintaining the pressure stability in the pressure regulation chamber 130.

[0068] The end cap 300 is also specially designed with a through channel 320. This channel is designed to provide a through path for the connecting pipe 400, ensuring that the pressure regulating medium from the external medium source can smoothly enter the medium flow channel 200 in the rotating shaft 100, so as to realize the continuous supply and pressure regulation of the medium.

[0069] One end of the connecting pipe 400 is connected to an external medium source, such as an evaporator or refrigerant storage tank, and the other end passes through the through-channel 320 of the end cover 300 and connects with the first channel section 210 inside the rotating shaft 100, forming a complete medium flow line from the medium source to the pressure regulating chamber 130.

[0070] The connecting pipe 400 is usually also equipped with an electronic regulating valve. This valve can automatically adjust the pressure and flow rate of the pressure regulating medium entering the first channel section 210 according to the real-time operating conditions of the compressor, so as to ensure that the pressure regulation between the impeller component 110 and the housing component 120 achieves the optimal effect.

[0071] Specifically, such as Figure 4 As shown, the second sealing part 310 includes: a plurality of second protrusions 311, the plurality of second protrusions 311 being spaced apart along the axial direction of the end cover 300, and a second groove 312 being provided on the side of each second protrusion 311, so that after the pressure regulating medium between the end cover 300 and the rotating shaft 100 leaks into the second groove 312, the flow rate is reduced.

[0072] Multiple second protrusions 311 are spaced apart along the axial direction of the end cover 300. This arrangement can increase the contact area between the second sealing part 310 and the rotating shaft 100, improve the sealing performance, and at the same time, the interval between the multiple protrusions controls the leakage path of the pressure regulating medium, avoiding direct high-speed leakage of the medium, which would affect the pressure balance and axial force regulation effect.

[0073] Each second protrusion 311 has a second groove 312 on its side. When the pressure regulating medium leaks from between the rotating shaft 100 and the end cap 300, the medium first enters these grooves. The purpose is to reduce the leakage velocity of the medium by increasing the path length of the medium and changing the flow direction, thereby reducing the impact of leakage on the pressure balance in the pressure regulating chamber 130.

[0074] This application also provides a compressor, including a housing and a shaft system, wherein the shaft system is disposed within the housing and is the shaft system of the above embodiment.

[0075] By modifying the shaft system structure, the axial force of the centrifugal compressor can be adjusted according to changes in operating conditions, thereby achieving axial force balance, improving compressor operating stability, and extending the overall lifespan of the compressor. It also reduces leakage between compressor stages, improving its operating efficiency.

[0076] The shaft system of this application features a hollow rotating shaft 100. Low-pressure refrigerant is introduced from the motor tail end through a conduit. The pressure within the cavity formed between the impeller back plate and the diffuser component 123 is controlled via a channel at the shaft center, thereby controlling the axial pressure on the impeller. This achieves the purpose of balancing the axial force on the impeller and reducing wear on the bearing 500.

[0077] This application relates to a centrifugal compressor employing a hollow shaft system, the purpose of which is to enable the axial force of the centrifugal compressor to be adjusted according to operating conditions.

[0078] The hollow shaft system structure involved in this application mainly includes the following parts: a hollow rotating shaft 100 with an opening in the inner diameter, a back plate of an impeller with a comb-tooth sealing structure, and an end cap with a comb-tooth sealing structure for connecting to an external low-pressure refrigerant.

[0079] The structure features a hollow rotating shaft (100mm) that connects to the low-pressure refrigerant in the evaporator via connecting pipes. An electronic regulating valve is attached to these pipes. The pressure in the hollow cavity behind the wheel can be adjusted as needed, following the pathway from the evaporator to the connecting pipes, the medium flow channel, and the pressure regulating chamber.

[0080] The entire organization mainly includes:

[0081] Hollow rotor (shaft): A central hole (first channel section) is made in the shaft to the rear of the impeller, and connected through oblique holes (second channel section) to ensure consistent pressure throughout the entire regulating mechanism (impeller back cavity, rotor central cavity, end cover cavity). The oblique holes are evenly distributed circumferentially, and their number depends on the diameter of the rotor central cavity and the diameter of the oblique holes. The sum of the cross-sectional areas of all oblique holes should be equal to the cross-sectional area of ​​the central hole. The diameter of the central hole should be between 1 / 8 and 1 / 10 of the maximum shaft diameter to ensure effective regulation while preventing excessive refrigerant flow, which could affect compressor efficiency.

[0082] The impeller with a sealed back structure: The impeller back side has a raised structure with a comb-tooth seal (i.e., the first sealing part) designed on the raised structure. This seal mates with the corresponding housing position, thereby forming a relatively sealed cavity (i.e., a pressure regulating cavity) on the back side. This cavity is the key structure for adjusting the axial force. By adjusting the motor regulating valve on the connecting pipe, the pressure P in this cavity can be adjusted, thereby adjusting the pressure on the entire back of the impeller, and thus adjusting the axial force on the entire rotating shaft 100.

[0083] End caps and connecting pipes: The end caps are cap-shaped structures with a central opening. Since the end caps are stationary compared to the rotor, they are machined with a comb-tooth seal (i.e., the second sealing part) to form a sealed cavity to create an internal and external pressure difference without affecting the rotation of the shaft. The central opening is connected to the connecting pipes, which draw low-pressure refrigerant gas from the evaporator. This eliminates the need for external regulating devices, reducing system complexity and energy consumption.

[0084] As can be seen from the above description, the embodiments of this application achieve the following technical effects:

[0085] According to the shaft system mechanism provided in this application, the rotating shaft 100 is internally designed with medium flow channels 200. One end of these channels is connected to an external medium source, which may be a low-pressure refrigerant or other pressure-regulating medium from the evaporator, while the other end is directly connected to the pressure regulating chamber 130. This design allows the medium to flow freely inside, thereby regulating the pressure within the pressure regulating chamber 130.

[0086] By adjusting the pressure of the regulating medium in real time during compressor operation, the magnitude and direction of the axial force can be effectively controlled, avoiding a series of problems caused by excessive axial force, such as thrust bearing wear, rotor axial movement, and impeller-casing collision, thus significantly improving the safety and stability of the equipment.

[0087] It reduces leakage of high-pressure gas from the rear of the impeller to the low-pressure side, optimizes the distribution of airflow inside the compressor, reduces energy waste, and improves the overall efficiency of the compressor.

[0088] The medium pressure can be flexibly adjusted according to different operating conditions (such as low flow rate and high pressure ratio), so that the compressor can maintain the best operating condition under various conditions, thus enhancing the adaptability of the equipment.

[0089] By effectively controlling the axial force, the stress on various components of the equipment is reduced, excessive wear and potential failure risks are avoided, and the service life of the compressor is extended.

[0090] The process of delivering the pressure regulating medium to the pressure regulating chamber 130 through the medium flow channel 200 requires precise control. Therefore, an electronic regulating valve is installed on the input pipeline to dynamically adjust the pressure and flow rate of the medium according to the actual operating conditions of the compressor.

[0091] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0092] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0093] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0094] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A shaft system mechanism, characterized in that, include: A rotating shaft (100) is fitted with an impeller component (110) and a housing component (120), and a pressure regulating chamber (130) is provided between the impeller component (110) and the housing component (120). A medium flow channel (200) is provided inside the rotating shaft (100). One end of the medium flow channel (200) is connected to the medium source, and the other end is connected to the pressure regulating chamber (130). The pressure of the pressure regulating medium introduced into the pressure regulating chamber (130) through the medium flow channel (200) is adjusted to regulate the pressure on the housing component (120) and the impeller component (110).

2. The shaft system mechanism according to claim 1, characterized in that, The medium flow channel (200) includes: The first channel segment (210) extends along the axial direction of the rotating shaft (100); The second channel segment (220) is connected to the first channel segment (210). The extension direction of the second channel segment (220) is set at an angle to the extension direction of the first channel segment (210). The first channel segment (210) is connected to the medium source, and the second channel segment (220) is connected to the pressure regulating chamber (130).

3. The shafting mechanism according to claim 2, characterized in that, There are multiple second channel segments (220), and the multiple second channel segments (220) are spaced apart along the circumferential direction of the rotating shaft (100), and each second channel segment (220) is connected to the first channel segment (210).

4. The shafting mechanism according to claim 3, characterized in that, The total cross-sectional area of ​​the flow section of each of the second channel segments (220) is equal to the cross-sectional area of ​​the flow section of the first channel segment (210).

5. The shafting mechanism according to claim 2, characterized in that, The inner diameter of the first channel segment (210) is 1 / 8 to 1 / 10 of the maximum outer diameter of the rotating shaft (100).

6. The shafting mechanism according to claim 1, characterized in that, The impeller component (110) includes a back plate (111), and the housing component (120) is provided with a concave wall surface (121). At least a portion of the back plate (111) is in contact with the concave wall surface (121), and the pressure regulating cavity (130) is disposed between the back plate (111) and the concave wall surface (121). The back plate (111) is provided with a first sealing part (140), at least a portion of which is in contact with the concave wall surface (121) to seal the pressure regulating cavity (130).

7. The shafting mechanism according to claim 6, characterized in that, The first sealing part (140) includes: Multiple first protrusions (141) are spaced apart on the back plate (111). Each first protrusion (141) is in contact with the concave wall surface (121). Each first protrusion (141) has a first groove (142) on its side, so that the pressure regulating medium in the pressure regulating cavity (130) leaks into the first groove (142) and reduces the flow rate.

8. The shafting mechanism according to claim 1, characterized in that, The shafting mechanism also includes: An end cap (300) is provided on one end of the rotating shaft (100) away from the impeller component (110). A second sealing part (310) is provided on the end cap (300). The second sealing part (310) extends in the circumferential direction of the end cap (300). At least a portion of the second sealing part (310) is in contact with the axial surface of the rotating shaft (100). The end cap (300) is also provided with a through channel (320), which is used to pass through the connecting pipe (400), and the medium flow channel (200) is connected to the medium source through the connecting pipe (400).

9. The shafting mechanism according to claim 8, characterized in that, The second sealing part (310) includes: Multiple second protrusions (311) are spaced apart along the axial direction of the end cap (300), and each second protrusion (311) has a second groove (312) on its side, so that the pressure regulating medium between the end cap (300) and the rotating shaft (100) leaks into the second groove (312) and reduces the flow rate.

10. A compressor, comprising a housing and a shafting mechanism, wherein the shafting mechanism is disposed within the housing, characterized in that, The shafting mechanism is the shafting mechanism according to any one of claims 1 to 9.

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