A radial flow energy-saving centrifugal air pump with shaft seal self-cooling force limiting protection

Abstract

This application belongs to the field of energy-saving pump technology and discloses a radial-flow energy-saving centrifugal air pump with shaft seal self-cooling force limiting protection. It includes a centrifugal air pump assembly, a pump impeller assembly, a shaft seal stationary ring assembly, a shaft seal rotating ring assembly, a mechanical push arm assembly, a limit drive arm assembly, and a traveling gear ring assembly. By opening cooling water channels on the stationary and rotating rings, and cooperating with a self-cooling water tank to form a circulating cooling system, it achieves self-cooling during idling and prevents overheating. Through the coordinated action of the mechanical push arm assembly and the limit drive arm assembly, it automatically applies and limits the safe thrust, ensuring reliable sealing and avoiding excessive wear. By utilizing the linkage between the traveling gear ring assembly and the pump impeller assembly, thrust adjustment is achieved entirely through its own rotation, requiring no external power. This application features a compact structure, reliable operation, and improves the safety and service life of the centrifugal air pump under abnormal operating conditions.

Description

Technical Field

[0001] This application belongs to the field of energy-saving pump technology, specifically relating to a radial flow energy-saving centrifugal air pump with shaft seal self-cooling force limiting protection. Background Technology

[0002] Centrifugal air pumps are widely used in chemical, environmental protection, water treatment and general industrial fields as common fluid transportation equipment. Among them, radial centrifugal air pumps pressurize and transport gas or gas-liquid mixtures through high-speed rotating impellers. Their shaft seal structure is a key component that determines the sealing performance and operational reliability of the pump body.

[0003] Currently, most centrifugal air pump shaft seals adopt a mechanical shaft seal structure, relying on the tight contact between the end faces of the rotating ring and the stationary ring to achieve a seal. However, in practical applications, the existing technology still has the following shortcomings:

[0004] High risk of overheating during idling: When a centrifugal air pump runs idling without media or with interrupted media, the friction pair between the dynamic and static rings cannot be effectively cooled, causing the temperature of the sealing interface to rise sharply, resulting in "overheating during idling". Prolonged idling can cause thermal damage, deformation or even failure of the mechanical shaft seal, which in turn can lead to media leakage and seriously affect the safety and service life of the equipment.

[0005] Difficulty in adjusting shaft seal thrust: The sealing performance of mechanical shaft seals depends on the appropriate contact pressure between the dynamic and static rings. Existing structures mostly rely on springs to provide initial thrust, but after long-term operation, the spring force is prone to decay, resulting in insufficient sealing force and media leakage. On the other hand, if the thrust is too large, it will aggravate the wear of the sealing end face and shorten the shaft seal life. At present, there is a lack of a structure that can dynamically apply and automatically limit the thrust during operation, making it difficult to avoid excessive wear while ensuring sealing reliability.

[0006] Thrust adjustment relies on external power: Some improvement schemes attempt to adjust the shaft seal thrust through external motors, electromagnets or control systems, but such designs require additional power sources and sensor control units, which not only increases system complexity and manufacturing costs, but also increases energy consumption, which is not conducive to the miniaturization and energy saving of the equipment.

[0007] Therefore, developing a centrifugal pump shaft seal structure that can achieve self-cooling of the shaft seal under idling conditions and can automatically apply and limit the safe thrust is a technical problem that urgently needs to be solved in this field.

[0008] Application content

[0009] To address the problems mentioned in the background technology, a self-cooling structure is formed by opening circulating cooling water channels on the stationary and rotating rings and cooperating with a self-cooling water tank to continuously cool the mechanical shaft seal during idling. An auxiliary mechanical thrust is applied to the rotating ring assembly of the shaft seal, and a safety thrust is automatically limited, forming a dynamic adjustment and protection mechanism against the shaft seal's resistance force. Through the linkage between the traveling gear ring assembly and the pump wheel assembly, the pump wheel's rotation is converted into the self-rotation driving force of the limited drive arm assembly, achieving thrust adjustment structure without external power triggering. This effectively prevents overheating during idling and excessive wear of the shaft seal while ensuring the reliability of the shaft seal's sealing.

[0010] To achieve the above objectives, this application provides the following technical solution: a radial flow energy-saving centrifugal air pump with shaft seal self-cooling force limiting protection, comprising a centrifugal air pump assembly, and further comprising:

[0011] A pump wheel assembly, which is disposed within a centrifugal air pump assembly, is used to pressurize the fluid inside the pump;

[0012] The shaft seal stationary ring assembly and the shaft seal rotating ring assembly are provided. The shaft seal stationary ring assembly is fixedly installed on the housing inside the centrifugal air pump assembly. The shaft seal rotating ring assembly is snapped onto one end of the pump wheel assembly. The shaft seal stationary ring assembly and the shaft seal rotating ring assembly are connected in abutment and sleeved on the outside of the shaft of the pump wheel assembly to form a mechanical shaft seal structure for the pump wheel assembly.

[0013] A mechanical push arm assembly is slidably disposed at one end of the pump wheel assembly and is used to apply mechanical thrust to the shaft seal dynamic ring assembly when sealing the shaft seal.

[0014] A limit drive arm assembly is rotatably mounted at one end of the pump wheel assembly, used to drive the mechanical push arm assembly to apply mechanical thrust to the shaft seal ring assembly and automatically limit the safe thrust applied by the mechanical push arm assembly to the shaft seal ring assembly.

[0015] The traveling gear ring assembly is fixed inside the centrifugal air pump assembly. As the pump wheel assembly rotates, it drives the limit drive arm assembly to mesh and rotate on the traveling gear ring assembly, automatically triggering the rotation of the limit drive arm assembly.

[0016] The thrust adjustment is automatically triggered when the pump wheel assembly rotates, and the upper limit of the shaft seal thrust is limited, thereby avoiding seal failure due to insufficient thrust or increased wear due to excessive thrust.

[0017] Preferably, the centrifugal pump assembly includes a radial centrifugal pump body, with a pump chamber inside one end of the radial centrifugal pump body, and a self-cooling water tank is provided at the top of the middle part of the radial centrifugal pump body.

[0018] The pump wheel assembly includes a pump shaft, a pump wheel is fixedly mounted on one end of the pump shaft, and a second cross arm, a first cross arm and a sliding groove arm are fixedly mounted on the end of the pump wheel near the pump shaft. A limit side groove is opened on one side of the sliding groove arm, and a locking block is fixedly mounted at the center of the end of the pump wheel near the pump shaft. A self-cooling water supply structure is formed inside the pump body, and an installation support base is provided for each drive arm assembly.

[0019] Preferably, the shaft seal stationary ring assembly includes a stationary ring, with an inlet groove and an outlet groove respectively opened at both ends of the stationary ring, and a second sealing ring and a first sealing ring are fixedly provided on the ring body near the outlet groove end of the stationary ring.

[0020] The shaft seal rotating ring assembly includes a rotating ring and an end ring. A contact spring with an outer sheath is fixedly installed between the end ring and the rotating ring. A fourth sealing ring and a fixing groove are respectively provided on the inner wall and edge of the end ring. A third sealing ring is fixedly installed on the inner wall of the rotating ring. A cooling groove is opened at one end of the rotating ring, and a push ring is fixedly installed at the other end of the rotating ring, forming a circulating cooling water channel between the stationary ring and the rotating ring. A thrust receiving structure is provided at the end of the rotating ring to facilitate the application of auxiliary thrust.

[0021] Preferably, the mechanical push arm assembly includes a slide rail arm slidably disposed within a sliding groove arm. A geared wheel and a support arm are fixedly disposed on both sides of the slide rail arm, respectively. A first fixed ring is fixedly disposed at the bottom of the support arm. A connecting rod is fixedly disposed on the first fixed ring. A second fixed ring is fixedly disposed at the end of the connecting rod away from the first fixed ring. The support arm slides within a limiting side groove. The rotational motion of the geared wheel is converted into a linear pushing motion of the second fixed ring, thereby achieving axial force application to the push ring.

[0022] Preferably, the limit drive arm assembly includes a splined shaft rotatably mounted on a first cross arm and an auxiliary shaft rotatably mounted on a second cross arm. A bevel gear and a second meshing gear ring are fixedly mounted at the top and bottom of the auxiliary shaft, respectively. A bottom ring and a geared wheel are fixedly mounted at the bottom of the splined shaft. A first meshing gear ring is slidably sleeved on the top of the splined shaft. A push spring is fixedly mounted at the bottom of the first meshing gear ring, and a spline groove matching the splined shaft is formed at the center of the first meshing gear ring. Automatic transmission and safety limitation of thrust are achieved through the engagement and disengagement of the first and second meshing gear rings.

[0023] Preferably, the traveling gear ring assembly includes a cross arm fixed to the inner wall of the pump chamber, and a traveling bevel gear ring is fixedly provided at one end of the cross arm to provide a fixed meshing track so that the bevel gear that revolves with the pump wheel assembly can rotate on its own axis.

[0024] Preferably, the stationary ring is fixed to the inner wall of the pump chamber by bolts, the stationary ring is sleeved on the outside of the pump shaft, the shaft seal moving ring assembly is sleeved on the outside of the pump shaft, the end ring is secured to the locking block by a fixing slot, and the moving ring abuts against the stationary ring to form a mechanical abutment shaft seal structure by the pushing of the abutment spring, and the end ring abuts against the pump wheel to form a basic mechanical shaft seal abutment structure.

[0025] Preferably, the end ring is sealed to the pump shaft through a fourth sealing ring, and the moving ring is sealed to the pump shaft through a third sealing ring. When the moving ring abuts against the stationary ring, the outer and inner walls of the moving ring are sealed by the second and first sealing rings, forming a multi-seal structure between the moving ring and the stationary ring to prevent cooling water leakage.

[0026] Preferably, the self-cooling water tank is connected to the inlet tank through a pipe, and the self-cooling water tank supplies cooling water to the cooling tank through the inlet tank and the outlet tank. The other side of the stationary ring is also provided with an inlet tank and an outlet tank. The self-cooling water tank extracts cooling water through the pipe and the inlet tank and outlet tank on the other side to form a complete circulating cooling water circuit, ensuring that the shaft seal can still be effectively cooled under idling conditions.

[0027] Preferably, the bevel gear meshes with the traveling bevel gear ring, and the first meshing gear ring and the second meshing gear ring mesh with each other through the pushing spring pushing the first meshing gear ring. The toothed wheel meshes with the toothed arm, and the second fixed ring is sleeved outside the abutting spring and abuts against the push ring, so that the fixed track motion of the traveling bevel gear ring is converted into the linear pushing action of the toothed arm, and the maximum thrust is automatically limited by the tooth-removing structure.

[0028] Compared with the prior art, the beneficial effects of this application are:

[0029] 1. Equipped with an idling self-cooling function to effectively prevent overheating during idling and thus seal failure: By opening water inlet and outlet grooves on the stationary ring assembly of the shaft seal and cooling grooves on the rotating ring assembly of the shaft seal, and in conjunction with the self-cooling water tank to form a circulating cooling water circuit, even when the centrifugal air pump is running without medium, the cooling water can still continuously cool the contact sealing surfaces of the rotating and stationary rings, avoiding thermal damage or failure of the mechanical shaft seal due to overheating during idling, and improving the operational safety of the centrifugal air pump under abnormal operating conditions.

[0030] 2. Automatic application and limitation of shaft seal thrust to ensure sealing reliability and prevent excessive wear: Through the coordinated action of the mechanical push arm assembly and the limiting drive arm assembly, auxiliary mechanical thrust can be applied to the shaft seal to ensure that the contact force between the rotating ring and the stationary ring meets the sealing requirements, avoiding seal failure due to the attenuation of the contact spring force. Simultaneously, utilizing the tooth-disengaging structure between the first and second meshing toothed rings, power transmission is automatically cut off when the thrust reaches the safety upper limit, preventing excessive thrust from causing excessive wear of the shaft seal and extending the service life of the mechanical shaft seal.

[0031] 3. Thrust adjustment is driven by the rotation of the pump wheel itself, without the need for an external power source: The traveling gear ring assembly fixed in the pump chamber meshes with the bevel gear in the limit drive arm assembly. When the pump wheel assembly rotates, it drives the limit drive arm assembly to revolve around the traveling gear ring assembly, thereby automatically triggering the bevel gear to rotate, which in turn drives the mechanical push arm assembly to apply shaft seal thrust. The entire thrust adjustment process is achieved entirely by the rotation of the centrifugal air pump itself, without the need to add an external motor or control system. It has a compact structure, is energy-saving and has low energy consumption. Attached Figure Description

[0032] Figure 1 This is a cross-sectional view of this application;

[0033] Figure 2 This is a perspective view of the present application;

[0034] Figure 3 A perspective view of some components of this application;

[0035] Figure 4 This is a perspective view of the pump wheel assembly of this application;

[0036] Figure 5 This is a cross-sectional view of the shaft seal stationary ring assembly and the shaft seal rotating ring assembly of this application;

[0037] Figure 6 This is a cross-sectional view of the mechanical push arm assembly, the limit drive arm assembly, and the traveling gear ring assembly of this application;

[0038] Figure 7 This is an exploded view of the limit drive arm assembly of this application;

[0039] Figure 8 This is a cross-sectional view of the shaft seal stationary ring assembly, shaft seal moving ring assembly, mechanical push arm assembly, limit drive arm assembly, and traveling gear ring assembly of this application.

[0040] Explanation of reference numerals in the attached drawings: 100, Centrifugal air pump assembly; 101, Radial centrifugal pump body; 102, Pump chamber; 103, Self-cooling water tank; 200, Pump impeller assembly; 201, Pump shaft; 202, Pump impeller; 203, Clamping block; 204, Limiting side groove; 205, Sliding groove arm; 206, First cross arm; 207, Second cross arm; 300, Shaft seal stationary ring assembly; 301, Stationary ring; 302, Inlet groove; 303, Outlet groove; 304, First sealing ring; 305, Second sealing ring; 400, Shaft seal moving ring assembly; 401, Moving ring; 402, Cooling groove; 403, Push ring; 404, Contact spring; 405, End. 406. Fixed slot; 407. Third sealing ring; 408. Fourth sealing ring; 500. Mechanical push arm assembly; 501. Slide rail arm; 502. Geared arm; 503. Support arm; 504. First fixed ring; 505. Connecting rod; 506. Second fixed ring; 600. Limit drive arm assembly; 601. Splined shaft; 602. Bottom ring; 603. Geared wheel; 604. Push spring; 605. First meshing gear ring; 606. Spline groove; 607. Auxiliary shaft; 608. Second meshing gear ring; 609. Bevel gear; 700. Traveling gear ring assembly; 701. Traveling bevel gear ring; 702. Cross arm. Detailed Implementation

[0041] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0042] Please see Figures 1-8 As shown, this application provides a radial flow energy-saving centrifugal air pump with shaft seal self-cooling force limiting protection, including a centrifugal air pump assembly 100, and further including:

[0043] Pump wheel assembly 200 is disposed within centrifugal air pump assembly 100 and is used to pressurize the fluid inside the pump.

[0044] The shaft seal stationary ring assembly 300 and the shaft seal rotating ring assembly 400 are fixedly installed on the housing inside the centrifugal air pump assembly 100, and the shaft seal rotating ring assembly 400 is snapped onto one end of the pump wheel assembly 200. The shaft seal stationary ring assembly 300 and the shaft seal rotating ring assembly 400 are in contact with each other and are sleeved on the outside of the shaft of the pump wheel assembly 200 to form a mechanical shaft seal structure for the pump wheel assembly 200.

[0045] Mechanical push arm assembly 500 is slidably disposed at one end of pump wheel assembly 200 and is used to apply mechanical thrust to shaft seal dynamic ring assembly 400 when shaft sealing is performed.

[0046] Limiting drive arm assembly 600 is rotatably disposed at one end of pump wheel assembly 200, used to drive mechanical push arm assembly 500 to apply mechanical thrust to shaft seal ring assembly 400 and automatically limit the safe thrust applied by mechanical push arm assembly 500 to shaft seal ring assembly 400;

[0047] The traveling gear ring assembly 700 is fixed inside the centrifugal air pump assembly 100. As the pump wheel assembly 200 rotates, it drives the limit drive arm assembly 600 to mesh and rotate on the traveling gear ring assembly 700, automatically triggering the rotation of the limit drive arm assembly 600.

[0048] In a preferred embodiment, please refer to Figure 1 The centrifugal pump assembly 100 includes a radial centrifugal pump body 101. A pump chamber 102 is opened inside one end of the radial centrifugal pump body 101, and a self-cooling water tank 103 is provided at the top of the middle part of the radial centrifugal pump body 101. The self-cooling water tank 103 is connected to the inlet tank 302 through a pipe, and the self-cooling water tank 103 sends cooling water into the cooling tank 402 through the inlet tank 302 and the outlet tank 303. An inlet tank 302 and an outlet tank 303 are also opened on the other side of the stationary ring 301. The self-cooling water tank 103 extracts cooling water through the pipe and the inlet tank 302 and the outlet tank 303 on the other side.

[0049] In a preferred embodiment, please refer to Figure 4 The pump wheel assembly 200 includes a pump shaft 201, a pump wheel 202 is fixedly mounted on one end of the pump shaft 201, a second cross arm 207, a first cross arm 206 and a sliding groove arm 205 are fixedly mounted on the end of the pump wheel 202 near the pump shaft 201, a limiting side groove 204 is provided on one side of the sliding groove arm 205, and a locking block 203 is fixedly mounted at the center of the end of the pump wheel 202 near the pump shaft 201.

[0050] In a preferred embodiment, please refer to Figure 5 The shaft seal stationary ring assembly 300 includes a stationary ring 301. The stationary ring 301 has an inlet groove 302 and an outlet groove 303 at its two ends, respectively. A second sealing ring 305 and a first sealing ring 304 are fixedly installed on the ring body of the stationary ring 301 near the outlet groove 303. The stationary ring 301 is fixed to the inner wall of the pump chamber 102 by bolts and is sleeved on the outside of the pump shaft 201.

[0051] In a preferred embodiment, please refer to Figure 5The shaft seal rotating ring assembly 400 includes a rotating ring 401 and an end ring 405. A retaining spring 404 with an outer sheath is fixedly disposed between the end ring 405 and the rotating ring 401. A fourth sealing ring 408 and a fixing groove 406 are respectively provided on the inner wall and edge of the end ring 405. A third sealing ring 407 is fixedly disposed on the inner wall of the rotating ring 401. A cooling groove 402 is opened at one end of the rotating ring 401, and a push ring 403 is fixedly disposed at the other end of the rotating ring 401. The shaft seal rotating ring assembly 400 is sleeved on the outside of the pump shaft 201. The end ring 405 is locked onto the locking block 203 through the fixing groove 406 and the retaining spring 404. When the 04 pushes, the moving ring 401 abuts against the stationary ring 301 to form a mechanical abutment shaft seal structure, the end ring 405 abuts against the pump wheel 202, and the end ring 405 is sealed between the pump shaft 201 and the fourth sealing ring 408. The moving ring 401 is sealed between the pump shaft 201 and the third sealing ring 407. When the moving ring 401 abuts against the stationary ring 301, the outer and inner walls of the moving ring 401 are sealed by the second sealing ring 305 and the first sealing ring 304. The second fixed ring 506 is sleeved outside the abutment spring 404 and abuts against the push ring 403.

[0052] In a preferred embodiment, please refer to Figure 6 The mechanical push arm assembly 500 includes a slide rail arm 501 slidably disposed in a slide groove arm 205. A toothed arm 502 and a support arm 503 are fixedly disposed on both sides of the slide rail arm 501, respectively. A first fixing ring 504 is fixedly disposed at the bottom of the support arm 503. A connecting rod 505 is fixedly disposed on the first fixing ring 504. A second fixing ring 506 is fixedly disposed at the end of the connecting rod 505 away from the first fixing ring 504. The support arm 503 slides in the limiting side groove 204, and the toothed wheel 603 meshes with the toothed arm 502.

[0053] In a preferred embodiment, please refer to Figure 6 and Figure 7 The limit drive arm assembly 600 includes a spline shaft 601 rotatably mounted on a first cross arm 206 and an auxiliary shaft 607 rotatably mounted on a second cross arm 207. A bevel gear 609 and a second meshing gear ring 608 are fixedly mounted on the top and bottom of the auxiliary shaft 607, respectively. A bottom ring 602 and a gear wheel 603 are fixedly mounted on the bottom of the spline shaft 601. A first meshing gear ring 605 is slidably sleeved on the top of the spline shaft 601. A push spring 604 is fixedly mounted on the bottom of the first meshing gear ring 605. A spline groove 606 matching the spline shaft 601 is opened in the center of the first meshing gear ring 605. The first meshing gear ring 605 and the second meshing gear ring 608 mesh with each other by pushing the first meshing gear ring 605 by the push spring 604.

[0054] In a preferred embodiment, please refer to Figure 6The traveling gear ring assembly 700 includes a cross arm 702 fixed on the inner wall of the pump chamber 102, and a traveling bevel gear ring 701 fixedly disposed at one end of the cross arm 702, with a bevel gear 609 meshing with the traveling bevel gear ring 701.

[0055] The working principle of this application is as follows: Existing centrifugal air pumps mostly use mechanical shaft seal structures. When the pump is running dry, the traditional mechanical shaft seal lacks a cooling structure, leading to overheating and eventual failure. To solve this problem, this application improves the shaft seal dynamic ring assembly 400, the shaft seal stationary ring assembly 300, and the centrifugal air pump assembly 100. Specifically, the dynamic ring 401 on the shaft seal dynamic ring assembly 400 abuts against the stationary ring 301, forming a contacting mechanical shaft seal structure. Simultaneously, this application provides an inlet groove 302 and an outlet groove 303 on the stationary ring 301, a cooling groove 402 on the dynamic ring 401, and a self-cooling water chamber 103 on the top of the centrifugal air pump assembly 100. In actual use, the self-cooling water chamber 103... The cold water tank 103 is connected to the inlet tank 302 through a pipe, and cooling water is supplied from the cold water tank 103 to the cooling tank 402 through the inlet tank 302 and the outlet tank 303. The other side of the stationary ring 301 is also provided with an inlet tank 302 and an outlet tank 303, and cooling water is extracted from the cold water tank 103 through the pipe and the inlet tank 302 and the outlet tank 303 on the other side. In this way, when the rotating ring 401 and the stationary ring 301 abut against each other to form a mechanical shaft seal, when the shaft seal rotating ring assembly 400 rotates with the pump wheel assembly 200, even if the pump is running dry, the shaft seal stationary ring assembly 300 and the shaft seal rotating ring assembly 400 still achieve self-cooling by relying on the above structure, thereby avoiding the seal failure caused by overheating during the dry run of the mechanical shaft seal.

[0056] Through the above structural configuration, this application realizes the active thermal management capability of the shaft seal assembly under no-medium idling conditions. Specifically, cooling water is continuously supplied from the cooling water tank 103 to the cooling tank 402 built into the rotating ring 401 via the inlet groove 302 and outlet groove 303 opened at both ends of the stationary ring 301, and then circulated and discharged. This forms a forced convection heat transfer circuit at the interface of the shaft seal friction pair. This circuit does not rely on the medium transported in the pump and can independently maintain the thermal balance between the shaft seal stationary ring assembly 300 and the shaft seal rotating ring assembly 400 under high-speed rotation. This reduces the risk of thermal damage to the sealing surface and seal failure caused by overheating during idling, and improves the thermal reliability and operational safety of the centrifugal air pump under abnormal conditions.

[0057] Based on the above, in actual use, the contact seal between the rotating ring 401 and the stationary ring 301 is achieved by the pushing force of the contact spring 404. If the contact force between the rotating ring 401 and the stationary ring 301 is too small, it will cause the shaft seal to fail. If the contact force between the rotating ring 401 and the stationary ring 301 is too large, it will cause the shaft seal to wear more rapidly. At the same time, in actual use, relying solely on the pushing force of the contact spring 404, after long-term use, the elasticity of the contact spring 404 will not be able to guarantee the contact seal between the rotating ring 401 and the stationary ring 301. In order to overcome the above problems, this application provides a mechanical push arm assembly 500 and a limit drive arm assembly. 600, Mechanical push arm assembly 500, is slidably disposed at one end of pump wheel assembly 200, used to apply mechanical thrust to shaft seal rotating ring assembly 400 during shaft sealing. Limiting drive arm assembly 600 is rotatably disposed at one end of pump wheel assembly 200, used to drive mechanical push arm assembly 500 to apply mechanical thrust to shaft seal rotating ring assembly 400 and automatically limit the safe thrust applied by mechanical push arm assembly 500 to shaft seal rotating ring assembly 400. In actual use, the rotation of spline shaft 601 drives gear 603 to rotate, and gear 603 pushes slide rail arm 501 forward in sliding groove arm 205 through gear arm 502. During sliding, the slide rail arm 501 drives the second fixed ring 506 to slide forward via the support arm 503, pushing the push ring 403 forward. This pushes the moving ring 401 closer to the stationary ring 301, forming an auxiliary thrust shaft seal structure. This prevents seal failure caused by insufficient contact force between the moving ring 401 and the stationary ring 301. Simultaneously, an auxiliary shaft 607 is provided at the top of the spline shaft 601. The auxiliary shaft 607 drives the spline shaft 601 to rotate through the meshing between the second meshing toothed ring 608 and the first meshing toothed ring 605. When the contact force between the moving ring 401 and the stationary ring 301 increases and the shaft seal between the moving ring 401 and the stationary ring 301 is satisfied... When closed, the resistance increases as the rotating spline shaft 601 pushes the moving ring 401 closer to the stationary ring 301. That is, at this time, the contact force between the moving ring 401 and the stationary ring 301 acts on the spline shaft 601, making it difficult for the spline shaft 601 to push the moving ring 401 forward. At this time, the second meshing tooth ring 608 and the first meshing tooth ring 605 at the bottom of the auxiliary shaft 607 disengage. That is, through the above-mentioned tooth disengagement structure, the auxiliary shaft 607 no longer drives the spline shaft 601 to rotate, and the spline shaft 601 no longer applies a greater thrust to the moving ring 401, avoiding abnormal shaft seal wear caused by excessive contact force between the moving ring 401 and the stationary ring 301.

[0058] This application further constructs a closed-loop shaft seal thrust self-adjustment architecture based on a mechanical push arm assembly 500 and a limit drive arm assembly 600. The spline shaft 601 drives the gear wheel 603 to rotate. The gear wheel 603 converts the rotational motion into axial feed of the slide rail arm 501 in the sliding groove arm 205 through meshing with the gear arm 502. Then, the second fixed ring 506 directly acts on the push ring 403 to apply auxiliary thrust to the moving ring 401, which compensates for the elasticity decay of the contact spring 404 due to long-term service. At the same time, when the contact reaction force between the moving ring 401 and the stationary ring 301 exceeds the set threshold, the second meshing toothed ring 608 at the bottom of the auxiliary shaft 607 disengages from the first meshing toothed ring 605, automatically cutting off the power transmission and forming a mechanical safety limit protection. This mechanism ensures the minimum contact pressure required by the sealing interface and avoids accelerated seal wear caused by excessive thrust, achieving a dynamic balance between sealing reliability and wear resistance throughout the entire life cycle of the shaft seal.

[0059] It should be noted that the resistance threshold between the moving ring 401 and the stationary ring 301 can be matched independently according to actual usage requirements.

[0060] Based on the above, in actual use, the moving ring 401 approaches the stationary ring 301 to form an abutment shaft seal structure through the rotation of the spline shaft 601. The rotation of the spline shaft 601 is achieved through the rotation of the auxiliary shaft 607. The question of under what conditions the auxiliary shaft 607 rotates, i.e., the rotation trigger point and the source of the rotation driving force, is a problem that needs to be solved. This application has a traveling gear ring assembly 700 fixedly installed inside the pump chamber 102. In actual use, the traveling bevel gear ring 701 on the traveling gear ring assembly 700 meshes with the bevel gear 609, while the limited drive arm assembly... The component 600 is mounted on the pump wheel assembly 200. The rotation of the pump wheel assembly 200 will drive the limit drive arm assembly 600 to rotate around the travel gear ring assembly 700. When the limit drive arm assembly 600 rotates around the travel gear ring assembly 700, the bevel gear 609 meshes and moves on the travel bevel gear ring 701. At this time, the auxiliary shaft 607 forms a self-rotating structure. Through this structure, the rotation of the limit drive arm assembly 600 is triggered. Moreover, the rotation of the limit drive arm assembly 600 does not require the setting of external power. It can be automatically triggered by the rotation of the pump wheel assembly 200 alone.

[0061] This application also proposes a passive thrust triggering scheme based on the motion coupling of the traveling bevel gear assembly 700 and the pump wheel assembly 200. The traveling bevel gear 701, fixed to the inner wall of the pump chamber 102, maintains constant meshing with the bevel gear 609 in the limit drive arm assembly 600. When the pump wheel assembly 200 rotates with the pump shaft 201, it drives the entire limit drive arm assembly 600 to revolve around the traveling bevel gear 701. The spatial meshing kinematic relationship causes the bevel gear 609 to generate forced rotation, which in turn drives the auxiliary shaft 607 to rotate and transmits the force step by step to the mechanical push arm assembly 500. The triggering and execution of the entire thrust adjustment process rely entirely on the mechanical rotational energy of the centrifugal air pump itself. There is no need to add external motors, sensors or control units. It has the technical advantages of high integration, zero additional energy consumption, energy saving and adaptive response to working conditions, which meets the design requirements of high-end fluid machinery for compact structure and autonomous operation.

[0062] It should be noted that the inlet and outlet of the radial centrifugal pump body 101 are prior art, so they will not be described in detail. When the cold water tank 103 supplies water to the static ring 301 through the pipeline, the pipeline laying, pressurization and cooling issues are conventional technologies, so they will not be described in detail.

[0063] In another embodiment of this application, a sealing ring chamber may be provided within the pump chamber 102 to house the limit drive arm assembly 600, the traveling gear ring assembly 700, the mechanical push arm assembly 500, etc. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0064] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A radial flow energy-saving centrifugal air pump with shaft seal self-cooling force limiting protection, comprising a centrifugal air pump assembly (100), characterized in that, Also includes: A pump wheel assembly (200) is disposed within a centrifugal air pump assembly (100) for pressurizing fluid within the pump; A shaft seal stationary ring assembly (300) and a shaft seal rotating ring assembly (400) are provided. The shaft seal stationary ring assembly (300) is fixedly installed on the housing inside the centrifugal air pump assembly (100). The shaft seal rotating ring assembly (400) is snapped onto one end of the pump wheel assembly (200). The shaft seal stationary ring assembly (300) and the shaft seal rotating ring assembly (400) are connected in abutment and sleeved on the outside of the shaft of the pump wheel assembly (200) to form a mechanical shaft seal structure for the pump wheel assembly (200). A mechanical push arm assembly (500) is slidably disposed at one end of the pump wheel assembly (200) and is used to apply mechanical thrust during shaft sealing to the shaft seal dynamic ring assembly (400); A limit drive arm assembly (600) is rotatably disposed at one end of the pump wheel assembly (200) and is used to drive the mechanical push arm assembly (500) to apply mechanical thrust to the shaft seal ring assembly (400) and automatically limit the safe thrust applied by the mechanical push arm assembly (500) to the shaft seal ring assembly (400). The traveling gear ring assembly (700) is fixed inside the centrifugal air pump assembly (100). As the pump wheel assembly (200) rotates, the limit drive arm assembly (600) meshes and rotates on the traveling gear ring assembly (700), automatically triggering the rotation of the limit drive arm assembly (600).

2. The radial flow energy-saving centrifugal air pump with shaft seal self-cooling force limiting protection according to claim 1, characterized in that: The centrifugal pump assembly (100) includes a radial centrifugal pump body (101), a pump chamber (102) is provided inside one end of the radial centrifugal pump body (101), and a self-cooling water tank (103) is provided at the top of the middle part of the radial centrifugal pump body (101). The pump wheel assembly (200) includes a pump shaft (201), a pump wheel (202) is fixedly provided at one end of the pump shaft (201), a second cross arm (207), a first cross arm (206) and a sliding groove arm (205) are fixedly provided at one end of the pump wheel (202) near the pump shaft (201), a limit side groove (204) is provided on one side of the sliding groove arm (205), and a locking block (203) is fixedly provided at the center of one end of the pump wheel (202) near the pump shaft (201).

3. A radial flow energy-saving centrifugal air pump with shaft seal self-cooling force limiting protection according to claim 2, characterized in that: The shaft seal stationary ring assembly (300) includes a stationary ring (301), with an inlet groove (302) and an outlet groove (303) respectively opened at both ends of the stationary ring (301), and a second sealing ring (305) and a first sealing ring (304) are fixedly provided on the ring body of the stationary ring (301) near the outlet groove (303). The shaft seal moving ring assembly (400) includes a moving ring (401) and an end ring (405). An abutment spring (404) with an outer sheath is fixedly provided between the end ring (405) and the moving ring (401). A fourth sealing ring (408) and a fixing groove (406) are respectively provided on the inner wall and edge of the end ring (405). A third sealing ring (407) is fixedly provided on the inner wall of the moving ring (401). A cooling groove (402) is opened at one end of the moving ring (401), and a push ring (403) is fixedly provided at the other end of the moving ring (401).

4. A radial flow energy-saving centrifugal air pump with shaft seal self-cooling force limiting protection according to claim 3, characterized in that: The mechanical push arm assembly (500) includes a slide rail arm (501) slidably disposed in a slide groove arm (205). A toothed arm (502) and a support arm (503) are fixedly disposed on both sides of the slide rail arm (501). A first fixing ring (504) is fixedly disposed at the bottom of the support arm (503). A connecting rod (505) is fixedly disposed on the first fixing ring (504). A second fixing ring (506) is fixedly disposed at the end of the connecting rod (505) away from the first fixing ring (504). The support arm (503) slides in the limiting side groove (204).

5. A radial flow energy-saving centrifugal air pump with shaft seal self-cooling force limiting protection according to claim 4, characterized in that: The limit drive arm assembly (600) includes a spline shaft (601) rotatably mounted on a first cross arm (206) and an auxiliary shaft (607) rotatably mounted on a second cross arm (207). A bevel gear (609) and a second meshing gear ring (608) are fixedly mounted on the top and bottom of the auxiliary shaft (607), respectively. A bottom ring (602) and a gear wheel (603) are fixedly mounted on the bottom of the spline shaft (601). A first meshing gear ring (605) is slidably sleeved on the top of the spline shaft (601). A push spring (604) is fixedly mounted on the bottom of the first meshing gear ring (605), and a spline groove (606) matching the spline shaft (601) is opened in the center of the first meshing gear ring (605).

6. A radial flow energy-saving centrifugal air pump with shaft seal self-cooling force limiting protection according to claim 5, characterized in that: The traveling toothed ring assembly (700) includes a cross arm (702) fixed on the inner wall of the pump chamber (102), and a traveling bevel toothed ring (701) is fixedly provided at one end of the cross arm (702).

7. A radial flow energy-saving centrifugal air pump with shaft seal self-cooling force limiting protection according to claim 3, characterized in that: The stationary ring (301) is fixed to the inner wall of the pump chamber (102) by bolts. The stationary ring (301) is sleeved on the outside of the pump shaft (201). The shaft seal moving ring assembly (400) is sleeved on the outside of the pump shaft (201). The end ring (405) is locked on the locking block (203) by the fixing slot (406). By the push of the abutment spring (404), the moving ring (401) abuts against the stationary ring (301) to form a mechanical abutment shaft seal structure. The end ring (405) abuts against the pump wheel (202).

8. A radial flow energy-saving centrifugal air pump with shaft seal self-cooling force limiting protection according to claim 3, characterized in that: The end ring (405) is sealed to the pump shaft (201) through the fourth sealing ring (408), and the moving ring (401) is sealed to the pump shaft (201) through the third sealing ring (407). When the moving ring (401) abuts against the stationary ring (301), the outer wall and inner wall of the moving ring (401) are sealed by the second sealing ring (305) and the first sealing ring (304).

9. A radial flow energy-saving centrifugal air pump with shaft seal self-cooling force limiting protection according to claim 3, characterized in that: The self-cooling water tank (103) is connected to the inlet tank (302) through a pipe, and the self-cooling water tank (103) sends cooling water into the cooling tank (402) through the inlet tank (302) and the outlet tank (303). The other side of the static ring (301) is also provided with an inlet tank (302) and an outlet tank (303). The self-cooling water tank (103) extracts cooling water through the pipe and the inlet tank (302) and the outlet tank (303) on the other side.

10. A radial flow energy-saving centrifugal air pump with shaft seal self-cooling force limiting protection according to claim 6, characterized in that: The bevel gear (609) meshes with the traveling bevel gear ring (701). The first meshing gear ring (605) is pushed by the push spring (604). The first meshing gear ring (605) and the second meshing gear ring (608) mesh. The toothed wheel (603) meshes with the toothed arm (502). The second fixed ring (506) is sleeved on the outside of the abutting spring (404) and abuts against the push ring (403).

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