Self-circulating flush seal assembly and method and pump apparatus

Abstract

The application provides a self-circulation flushing type sealing assembly and method and a pump device, which comprises a shell with a mechanical seal cavity, a rotating shaft, a sealing friction pair and a separation structure. The rotating shaft is rotatably arranged in the shell and penetrates through the mechanical seal cavity. The sealing friction pair comprises a dynamic ring arranged on the rotating shaft and a static ring arranged on the shell. The dynamic ring and the static ring can be tightly sealed in the mechanical seal cavity. The separation structure separates the mechanical seal cavity into an inner cavity and an outer cavity which are connected. The inner cavity is arranged at the periphery of the sealing friction pair. When the rotating shaft is in a rotating state, the fluid in the inner cavity can flow into the outer cavity under the driving of pressure and return to the inner cavity through the outer cavity to cool and / or lubricate the sealing friction pair. The inner cavity is arranged outside the sealing friction pair. When the rotating shaft rotates, the inner cavity can automatically generate stable fluid dynamic pressure, thereby driving the fluid to form a self-circulation flow which is independent of an external system, continuously cooling and lubricating the sealing friction pair and improving the working conditions of the sealing friction pair.

Description

Technical Field

[0001] This invention relates to the field of pump equipment technology, and in particular to a self-circulating flushing type sealing assembly and method and a pump equipment. Background Technology

[0002] Mechanical seals are critical components in rotating equipment, preventing leakage of the working medium along the shaft. Their reliability is paramount, especially in pumps operating under harsh conditions such as high temperature and high pressure. The friction pairs of mechanical seals generate significant frictional heat during operation. If this heat cannot be dissipated promptly, the temperature of the sealing surface will rise sharply, causing deformation, thermal cracking, and accelerated wear of the sealing ring, ultimately leading to seal failure and media leakage. To ensure long-term stable operation of the seal, existing technologies employ self-flushing and external flushing methods to provide cooling and lubrication for the friction pairs within the mechanical seal cavity. However, in many practical applications, existing flushing methods face significant limitations: when the conveyed medium is viscous, contains solid particles, is prone to crystallization, or easily cokes, the flushing fluid can easily clog the flow channels or deposit in the sealing cavity, accelerating seal damage; external flushing is difficult to implement in situations where system space is limited or an external clean liquid source is lacking; and self-flushing cannot establish effective circulation when the pump head is insufficient. During operation, not only may gas remain within the mechanical seal cavity, but the media may also vaporize due to frictional heat generated at the sealing end face. When the shaft rotates at high speed, the fluid inside the cavity experiences significant gas-liquid separation due to centrifugal force: the less dense gas accumulates towards the center of rotation, while the liquid is thrown to the periphery. This gas accumulation prevents the formation of an effective fluid lubrication film on the sealing surface, leading to dry friction and severely reducing sealing performance and service life. Existing flushing methods often respond slowly or are unable to address such sudden gas retention issues. Therefore, establishing an effective self-circulating flow within the mechanical seal cavity to continuously cool and lubricate the sealing surface has become a pressing technical problem to be solved. Summary of the Invention

[0003] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the embodiments of the present invention is to provide a self-circulating flushing sealing assembly, method and pump device for establishing effective self-circulating flow in the mechanical seal cavity to continuously cool and lubricate the sealing surface.

[0004] The above-mentioned objective of the present invention can be achieved by the following technical solution: the present invention provides a self-circulating flushing sealing assembly, comprising: A housing with a mechanically sealed cavity; A rotating shaft, which is rotatably disposed within the housing and extends through the mechanical seal cavity; A sealing friction pair, comprising a rotating ring disposed on the rotating shaft and a stationary ring disposed on the housing, wherein the rotating ring and the stationary ring are capable of fitting and sealing together in the mechanical seal cavity; The partition structure divides the mechanical seal cavity into a communicating inner cavity and an outer cavity. The inner cavity is located around the sealing friction pair, and the outer cavity is located around the inner cavity. When the shaft is rotating, the fluid in the inner cavity can flow into the outer cavity under pressure and then flow back to the inner cavity through the outer cavity to cool and / or lubricate the sealing friction pair.

[0005] In a preferred embodiment of the present invention, the inner cavity is eccentrically disposed around the periphery of the sealing friction pair. When the shaft is rotating, the fluid in the inner cavity can flow into the outer cavity under the drive of eccentric pressure and flow back to the inner cavity through the outer cavity to cool and / or lubricate the sealing friction pair.

[0006] In a preferred embodiment of the invention, the radial dimension of at least a portion of the inner cavity gradually increases along the circumferential direction of the axis of rotation.

[0007] In a preferred embodiment of the present invention, an annular gap is provided between the end of the inner cavity near the sealing friction pair and the outer cavity, and a discharge hole is provided between the end of the inner cavity away from the sealing friction pair and the outer cavity, so that the fluid in the inner cavity can flow out through the discharge hole and return through the annular gap.

[0008] In a preferred embodiment of the present invention, the extension direction of the discharge hole is parallel to the tangential direction of the sealing friction pair.

[0009] In a preferred embodiment of the present invention, the partition structure includes a first partition plate disposed in the mechanical seal cavity and surrounding the outer side of the sealing friction pair. The end of the first partition plate away from the sealing friction pair is connected to the housing and has a discharge hole. The end of the first partition plate near the sealing friction pair is spaced apart from the inner wall of the housing to form the annular gap.

[0010] In a preferred embodiment of the present invention, the first partition plate is provided with a flow guide at one end near the annular gap, the flow guide having a first preset guide angle, the flow guide being used to guide fluid flow toward the sealing friction pair.

[0011] In a preferred embodiment of the present invention, the housing further includes an exhaust chamber communicating with the mechanical seal cavity and an exhaust hole communicating with the exhaust chamber, the exhaust chamber being located outside the outer cavity.

[0012] In a preferred embodiment of the present invention, the exhaust chamber is located above the outer cavity.

[0013] In a preferred embodiment of the present invention, the partition structure further includes a second partition plate disposed between the exhaust chamber and the outer cavity. One end of the second partition plate is connected to one side end face of the housing, and an air intake gap is provided between the other end of the second partition plate and the other side end face of the housing. The extending direction of the air intake gap is parallel to the rotating shaft.

[0014] In a preferred embodiment of the present invention, the self-circulating flushing sealing assembly further includes a turbulence portion disposed on the inner wall of the housing and protruding into the outer cavity.

[0015] This invention provides a self-circulating flushing method, implemented using the aforementioned self-circulating flushing sealing assembly, the self-circulating flushing method comprising the following steps: The drive shaft rotates, which in turn drives the rotating ring to rotate together, so that the rotating ring and the stationary ring fit together in the mechanical seal cavity to form a sealing friction pair; The rotation of the shaft drives the fluid in the inner cavity, generating a pressure difference in the inner cavity; Under the pressure difference, the fluid in the inner cavity is driven to flow into the outer cavity, and then flows back to the inner cavity through the outer cavity. During the recirculation process, the recirculated fluid is used to cool and / or lubricate the sealing friction pair.

[0016] The present invention provides a pump device including the aforementioned self-circulating flushing sealing assembly.

[0017] The technical solution of the present invention has the following significant beneficial effects: The self-circulating flushing sealing assembly of this invention, when in use, can divide the mechanical seal cavity into a connected inner cavity and an outer cavity through a partition structure. The inner cavity is located outside the sealing friction pair. When the shaft rotates, a stable pressure difference is automatically generated in the inner cavity. This pressure difference drives the fluid in the inner cavity to circulate, thus forming a completely self-circulating sealing flushing fluid within the mechanical seal cavity that does not rely on any external flushing system or the pump's own system pressure difference. The sealing flushing fluid can continuously remove the heat generated by the sealing friction pair and provide lubrication, significantly improving the working conditions of the sealing friction pair. It fundamentally solves the technical problems of existing self-flushing methods failing to establish effective circulation when the pump head is insufficient and existing external flushing methods being difficult to implement when space or resources are limited. It also overcomes the defects of existing flushing methods that are prone to clogging and failure when conveying viscous, easily crystallizing, or gas-containing media. It is especially suitable for occasions with complex media conditions or harsh installation conditions, greatly improving the reliability and service life of the mechanical seal. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, guided by the teachings of this invention, can select various possible shapes and proportions to implement the invention according to specific circumstances.

[0020] Figure 1 This is a front sectional perspective view of one embodiment of the self-circulating flushing sealing assembly described in this invention; Figure 2 This is a front sectional view of one embodiment of the self-circulating flushing sealing assembly described in this invention; Figure 3 This is a side sectional perspective view of one embodiment of the self-circulating flushing sealing assembly of the present invention; Figure 4 This is a side sectional view of one embodiment of the self-circulating flushing sealing assembly of the present invention; Figure 5 This is a schematic diagram of a three-dimensional installation structure of one embodiment of the first partition plate of the present invention; Figure 6 This is a schematic diagram of fluid flow in one embodiment of the discharge hole and annular gap described in this invention; Figure 7 This is a side sectional view of an embodiment of the first and second flow guiding end faces of the present invention. Figure 8 This is a flow velocity distribution diagram of a fluid simulation of the self-circulating flushing sealing assembly described in this invention.

[0021] The reference numerals in the above figures are as follows: 10. Internal cavity; 20. External cavity; 30. Exhaust chamber; 100. Casing; 110. Vent port; 200. Shaft; 300. Sealing friction pair; 310. Dynamic ring; 320. Stationary ring; 321. Second guide end face; 400. Separation structure; 410. First separator plate; 411. Annular gap; 412. Discharge hole; 413. Guide section; 4131. First guide end face; 420. Second separator plate; 421. Inlet gap; 500. Disruption section. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Implementation Method 1

[0024] Please refer to the following: Figures 1 to 8 As shown, an embodiment of the present invention provides a self-circulating flushing sealing assembly, which includes a housing 100 having a mechanical seal cavity, a rotating shaft 200, a sealing friction pair 300, and a partition structure 400. The rotating shaft 200 is rotatably disposed in the housing 100 and passes through the mechanical seal cavity. The sealing friction pair 300 includes a rotating ring 310 disposed on the rotating shaft 200 and a stationary ring 320 disposed on the housing 100. The rotating ring 310 and the stationary ring 320 can fit together and seal in the mechanical seal cavity. The partition structure 400 divides the mechanical seal cavity into a communicating inner cavity 10 and an outer cavity 20. The inner cavity 10 is disposed around the sealing friction pair 300, and the outer cavity 20 is disposed around the inner cavity 10. When the rotating shaft 200 is rotating, the fluid in the inner cavity 10 can flow into the outer cavity 20 under pressure and return to the inner cavity 10 through the outer cavity 20 to cool and / or lubricate the sealing friction pair 300.

[0025] Overall, this self-circulating flushing seal assembly, when in use, uses a partition structure 400 to divide the mechanical seal cavity into a connected inner cavity 10 and an outer cavity 20. The inner cavity 10 is located outside the sealing friction pair 300. When the shaft 200 rotates, a stable pressure difference is automatically generated in the inner cavity 10. This pressure difference drives the fluid in the inner cavity 10 to circulate, thus forming a completely self-circulating sealing flushing fluid within the mechanical seal cavity, independent of any external flushing system or the pump's own system pressure difference. The sealing flushing fluid continuously removes the heat generated by the sealing friction pair 300 and provides lubrication, significantly improving the working conditions of the sealing friction pair 300. This fundamentally solves the technical problems of existing self-flushing methods failing to establish effective circulation when the pump head is insufficient, and existing external flushing methods being difficult to implement when space or resources are limited. It also overcomes the defects of existing flushing methods that are prone to clogging and failure when conveying viscous, easily crystallizing, or gas-containing media. It is especially suitable for applications with complex media conditions or harsh installation conditions, greatly improving the reliability and service life of the mechanical seal.

[0026] In embodiments of the present invention, the designer can adjust the communication method between the inner cavity 10 and the outer cavity 20 according to usage needs to form a path for fluid circulation, without specific limitations. For example, the inner cavity 10 and the outer cavity 20 can be connected through at least two connecting holes to achieve circulating flow. Alternatively, the inner cavity 10 and the outer cavity 20 can be connected through at least two connecting gaps to achieve circulating flow. Or, the inner cavity 10 and the outer cavity 20 can be connected through a combination of connecting holes and connecting gaps to achieve circulating flow.

[0027] In an embodiment of the present invention, the inner cavity 10 is eccentrically disposed on the periphery of the sealing friction pair 300. When the shaft 200 is rotating, the fluid in the inner cavity 10 can flow into the outer cavity 20 under the drive of the eccentric pressure and flow back to the inner cavity 10 through the outer cavity 20 to cool and / or lubricate the sealing friction pair 300.

[0028] When the shaft 200 rotates, it can automatically generate a stable eccentric pressure in the eccentrically arranged inner cavity 10. The eccentric pressure can drive the fluid in the inner cavity 10 to circulate, thereby improving the flushing efficiency.

[0029] In an embodiment of the invention, the radial dimension of at least a portion of the inner cavity 10 gradually increases along the circumference of the rotating shaft 200. By setting the radial dimension of at least a portion of the inner cavity 10 to gradually increase along the circumference of the rotating shaft 200, a progressive eccentric flow channel structure is formed, thereby more effectively converting the kinetic energy of the rotation of the rotating shaft 200 into stable fluid dynamic pressure, i.e., eccentric pressure, which helps to enhance the driving force of fluid circulation.

[0030] Designers can adjust the eccentricity of the inner cavity 10 relative to the axis of the rotating shaft 200 according to usage needs, without specifying a particular value. Here, the eccentricity refers to the deviation of the axis of the rotating shaft 200 from the axial centerline of the inner cavity 10 in the radial direction of the rotating shaft 200.

[0031] In one specific embodiment, the eccentricity of the inner cavity 10 relative to the axis of the rotating shaft 200 is approximately 3 mm. Through CFD simulation calculations, when the eccentricity of the inner cavity 10 is set at 3 mm, a static pressure of approximately 0.29 bar can be formed in the inner cavity 10, which fully meets the requirements for driving the circulation of the mechanical seal flushing fluid.

[0032] In an embodiment of the present invention, an annular gap 411 is provided between the end of the inner cavity 10 near the sealing friction pair 300 and the outer cavity 20, and a discharge hole 412 is provided between the end of the inner cavity 10 away from the sealing friction pair 300 and the outer cavity 20, so that the fluid in the inner cavity 10 can flow out through the discharge hole 412 and return through the annular gap 411.

[0033] By setting discharge holes 412 and annular gaps 411 at both ends of the inner cavity 10, the specific path of fluid circulation is defined. Fluid can be efficiently pumped out from the discharge holes 412 located at the top of the inner cavity 10 and flow back to the inner cavity 10 through the annular gaps 411. During this process, the fluid will continuously cool and / or lubricate the sealing friction pair 300.

[0034] According to CFD simulation calculations, the fluid in the inner cavity 10 can generate a flow velocity of 1.5 m / s to 1.8 m / s in the flow area of ​​the discharge hole 412, which can meet the requirements of the circulation flow rate.

[0035] In an embodiment of the present invention, the extending direction of the discharge hole 412 is parallel to the tangential direction of the sealing friction pair 300. By making the extending direction of the discharge hole 412 parallel to the tangential direction of the sealing friction pair 300, the discharge hole 412 is aligned with the tangential direction of the rotating fluid, allowing the fluid to be discharged from the discharge hole 412 with less energy loss, thereby improving circulation efficiency.

[0036] Designers can adjust the specific location and orientation of the discharge hole 412 according to usage needs, and no specific restrictions are imposed here. Preferably, the discharge hole 412 is arranged along the height direction and located at the top of the inner cavity 10.

[0037] By placing the discharge hole 412 at the top of the inner cavity 10, it is also beneficial to discharge the gas in the inner cavity 10, preventing gas retention from causing dry friction of the sealing friction pair 300.

[0038] In an embodiment of the present invention, the partition structure 400 includes a first partition plate 410 disposed in the mechanical seal cavity and surrounding the outer side of the sealing friction pair 300. The end of the first partition plate 410 away from the sealing friction pair 300 is connected to the housing 100 and is provided with a discharge hole 412. The end of the first partition plate 410 near the sealing friction pair 300 is spaced apart from the inner wall of the housing 100 to form an annular gap 411.

[0039] Preferably, the first partition plate 410 is integrally formed with the housing 100. More preferably, the first partition plate 410 and the housing 100 are integrally cast. The first partition plate 410 achieves cavity separation, and the inner cavity 10 of the housing 100, the first partition plate 410, and the discharge hole 412 can be manufactured by integral casting, which greatly simplifies the manufacturing process and improves the overall structure and strength.

[0040] In an embodiment of the present invention, a flow guide 413 is provided at one end of the first partition plate 410 near the annular gap 411. The flow guide 413 has a first preset guide angle and is used to guide the fluid to the sealing friction pair 300.

[0041] By providing a flow guide 413 with a first preset guide angle at the end of the first partition plate 410, the fluid flowing back from the annular gap 411 can be actively guided, and the fluid, which may have been disordered, can be precisely guided to the sealing surface of the sealing friction pair 300, thereby achieving targeted flushing and cooling of the sealing surface area and significantly improving the cooling and lubrication effect.

[0042] Designers can adjust the specific structure of the guide section 413 and the specific size of the preset guide angle according to usage needs, without specific limitations. Preferably, the guide section 413 has a first guide end face 4131 on the side facing the sealing friction pair 300, and the angle between the first guide end face 4131 and the axis of the rotating shaft 200 is the first preset guide angle. More preferably, the size of the first preset guide angle is α, where 0 < α ≤ 60°.

[0043] Furthermore, the stationary ring 320 has a second guide end face 321 on one side facing the guide portion 413, and the angle between the second guide end face 321 and the axis of the rotating shaft 200 is a second preset guide angle. Preferably, the size of the second preset guide angle is β, where 0 < β ≤ 60°.

[0044] By setting a second flow guide end face 321, the second flow guide end face 321 and the first flow guide end face 4131 cooperate to form a flow guide channel, thereby better guiding the fluid to target and cool the sealing surface area.

[0045] According to CFD simulation calculations, the flow direction and vortex control can be properly controlled by the first preset guide angle α and the second preset guide angle β, so that the circulation velocity passing through the sealing surface meets the flushing requirements.

[0046] During operation, not only may gas remain trapped inside the mechanical seal cavity, but the medium may also vaporize due to heat generated by friction at the sealing end face. When the shaft 200 rotates at high speed, the fluid inside the cavity experiences a significant gas-liquid separation effect due to centrifugal force: the less dense gas accumulates towards the center of rotation, while the liquid is thrown to the periphery. This gas accumulation prevents the formation of an effective fluid lubrication film on the sealing end face, thus causing dry friction and severely reducing sealing performance and service life.

[0047] In order to solve the above-mentioned technical problems, in the embodiments of the present invention, the housing 100 further includes an exhaust chamber 30 connected to the mechanical seal cavity and an exhaust hole 110 connected to the exhaust chamber 30, wherein the exhaust chamber 30 is located outside the outer cavity 20.

[0048] Designers can adjust the specific location of the exhaust chamber 30 according to usage needs, and no specific restrictions are imposed here. Preferably, the exhaust chamber 30 is located in the upper middle part of the outer cavity 20, and can be set at any position in the circumference of the outer cavity 20. More preferably, the exhaust chamber 30 is located above the outer cavity 20.

[0049] By providing an exhaust chamber 30, a dedicated space is created for collecting and discharging gases entrained or released in the circulating fluid. Gases in the circulating fluid can naturally rise and accumulate at the top of the exhaust chamber 30 during circulation. They can then be discharged from the system through the exhaust port 110 or remain at the top of the exhaust chamber 30, effectively preventing gas accumulation at the center of rotation and entry into the sealing surface. This fundamentally eliminates the risk of dry running caused by heating and centrifugal force.

[0050] Designers can adjust the specific shape and structure of the exhaust chamber 30 according to usage needs, and no specific restrictions are imposed here. Preferably, the top of the exhaust chamber 30 is tapered to facilitate air collection, and the exhaust port 110 connects to the top of the exhaust chamber 30.

[0051] Specifically, before starting the pump, a priming operation is performed. During this process, the vent 110 is kept open, and the liquid level in the housing 100 gradually rises. The discharge hole 412 located at the top of the inner cavity 10 facilitates the natural discharge of gas from the housing 100, eliminating any dead zones where gas may accumulate. The priming operation is complete when the priming medium overflows from the vent 110.

[0052] In an embodiment of the present invention, the partition structure 400 further includes a second partition plate 420 disposed between the exhaust chamber 30 and the outer cavity 20. One end of the second partition plate 420 is connected to one side end face of the housing 100, and an air intake gap 421 is provided between the other end of the second partition plate 420 and the other side end face of the housing 100. The extending direction of the air intake gap 421 is parallel to the rotating shaft 200.

[0053] Preferably, the second partition plate 420 is integrally formed with the housing 100. More preferably, the second partition plate 420 and the housing 100 are integrally cast. The second partition plate 420 achieves cavity separation, and the exhaust chamber 30 and the intake gap 421 can be manufactured by integral casting, which greatly simplifies the manufacturing process and improves the overall structure and strength.

[0054] The second partition plate 420, in conjunction with the air intake gap 421, achieves gas capture and fluid obstruction, allowing gas to rise freely into the exhaust chamber 30. At the same time, it effectively buffers and blocks the high-speed liquid flow below from directly entering the exhaust chamber 30, preventing the fluid from re-entraining the separated gas and ensuring the stability of the gas separation effect.

[0055] In an embodiment of the present invention, the self-circulating flushing sealing assembly further includes a turbulence portion 500 disposed on the inner wall of the housing 100 and protruding into the outer cavity 20.

[0056] Specifically, the spoiler 500 is disposed in the outer cavity 20 away from the intake gap 421. Designers can adjust the specific shape of the spoiler 500 according to usage requirements, and no specific limitations are imposed here. Preferably, the spoiler 500 is a rib protruding from the outer cavity 20. More preferably, the thickness of the rib gradually decreases from its root to its top.

[0057] The high-speed fluid discharged through the discharge port 412 impacts the second partition plate 420 and naturally splits into two main streams. One stream is interfered with by the turbulence section 500, and its kinetic energy is directly dissipated, resulting in a significant reduction in velocity. The other stream enters the intake gap 421 region and forms a pair of stable vortices with opposite directions on both sides of the intake gap 421. Utilizing the internal shearing and counter-current action of the fluid, its velocity cancels itself out and further decreases. Under the combined action of this dual deceleration mechanism, when the fluid finally reaches the exhaust chamber 30, its flow velocity has approached zero, forming an extremely calm liquid phase region. This ensures that the gas in the fluid can completely escape the fluid's entrainment and rise steadily to the top of the exhaust chamber 30 and accumulate, achieving effective gas separation.

[0058] Furthermore, the near-static liquid interface within the exhaust chamber 30 prevents the separated gas from being drawn back into the circulation path to the greatest extent possible, thereby achieving highly efficient and stable gas-liquid separation and fundamentally preventing gas from entering the sealing surface and causing dry friction problems.

[0059] Implementation Method 2

[0060] An embodiment of the present invention provides a self-circulating flushing method, implemented using the self-circulating flushing sealing assembly described in Embodiment 1. The self-circulating flushing method includes the following steps: Step S1: Drive the rotating shaft 200 to rotate, and use the rotating shaft 200 to drive the rotating ring 310 to rotate together, so that the rotating ring 310 and the stationary ring 320 fit together in the mechanical seal cavity to form a sealing friction pair 300; Step S2: The rotation of the rotating shaft 200 drives the fluid in the inner cavity 10, generating a pressure difference in the inner cavity 10; Step S3: Under the action of pressure difference, the fluid in the inner cavity 10 is driven to flow into the outer cavity 20, and then flows back to the inner cavity 10 through the outer cavity 20; Step S4: During the reflow process, the reflowing fluid is used to cool and / or lubricate the sealing friction pair 300.

[0061] This self-circulating flushing method automatically generates fluid driving pressure within the inner cavity 10 by driving the shaft 200 to rotate, thereby establishing an independent, closed, and continuous self-circulating flow within the mechanical seal cavity without relying on any external flushing system. This circulation continuously removes heat generated by the sealing friction pair 300 and provides effective lubrication, significantly improving the seal's adaptability, operational reliability, and service life under complex media conditions (such as viscous and easily crystallizing media), making it particularly suitable for harsh industrial applications where installation space or external resources are limited.

[0062] Implementation Method 3

[0063] An embodiment of the present invention provides a pump device including a self-circulating flushing sealing assembly as described in Embodiment 1. The specific structure and beneficial effects of this self-circulating flushing sealing assembly are the same as those described in Embodiment 1, and are not specifically limited herein. Designers can determine the specific model of the pump device according to their needs, and are not specifically limited herein.

[0064] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified element, component, part, or step, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute “may” include is optional. Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The disclosure of “a” or “an” used to describe an element, component, part, or step does not imply exclusion of other elements, components, parts, or steps.

[0065] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A self-circulating flushing sealing assembly, characterized in that, include: A housing with a mechanically sealed cavity; A rotating shaft, which is rotatably disposed within the housing and extends through the mechanical seal cavity; A sealing friction pair, comprising a rotating ring disposed on the rotating shaft and a stationary ring disposed on the housing, wherein the rotating ring and the stationary ring are capable of fitting and sealing together in the mechanical seal cavity; The partition structure divides the mechanical seal cavity into a communicating inner cavity and an outer cavity. The inner cavity is located around the sealing friction pair, and the outer cavity is located around the inner cavity. When the shaft is rotating, the fluid in the inner cavity can flow into the outer cavity under pressure and then flow back to the inner cavity through the outer cavity to cool and / or lubricate the sealing friction pair.

2. The self-circulating flushing sealing assembly as described in claim 1, characterized in that, The inner cavity is eccentrically disposed around the periphery of the sealing friction pair. When the shaft is rotating, the fluid in the inner cavity can flow into the outer cavity under the eccentric pressure and then flow back to the inner cavity through the outer cavity to cool and / or lubricate the sealing friction pair.

3. The self-circulating flushing sealing assembly as described in claim 1, characterized in that, Along the circumference of the axis of rotation, the radial dimension of at least a portion of the inner cavity gradually increases.

4. The self-circulating flushing sealing assembly as described in claim 1, characterized in that, An annular gap is provided between the end of the inner cavity near the sealing friction pair and the outer cavity, and a discharge hole is provided between the end of the inner cavity away from the sealing friction pair and the outer cavity, so that the fluid in the inner cavity can flow out through the discharge hole and return through the annular gap.

5. The self-circulating flushing sealing assembly as described in claim 4, characterized in that, The extension direction of the discharge hole is parallel to the tangential direction of the sealing friction pair.

6. The self-circulating flushing sealing assembly as described in claim 4, characterized in that, The partition structure includes a first partition plate disposed in the mechanical seal cavity and surrounding the outer side of the sealing friction pair. The end of the first partition plate away from the sealing friction pair is connected to the housing and has the discharge hole. The end of the first partition plate near the sealing friction pair is spaced apart from the inner wall of the housing to form the annular gap.

7. The self-circulating flushing sealing assembly as described in claim 6, characterized in that, The first partition plate has a flow guide at one end near the annular gap. The flow guide has a first preset guide angle and is used to guide the fluid to the sealing friction pair.

8. The self-circulating flushing sealing assembly as described in claim 1, characterized in that, The housing also includes an exhaust chamber connected to the mechanical seal cavity and an exhaust port connected to the exhaust chamber, the exhaust chamber being located outside the outer cavity.

9. The self-circulating flushing sealing assembly as described in claim 8, characterized in that, The exhaust chamber is located above the outer cavity.

10. The self-circulating flushing sealing assembly as described in claim 8, characterized in that, The partition structure further includes a second partition plate disposed between the exhaust chamber and the outer cavity. One end of the second partition plate is connected to one side end face of the housing, and an air intake gap is provided between the other end of the second partition plate and the other side end face of the housing. The extension direction of the air intake gap is parallel to the rotating shaft.

11. The self-circulating flushing sealing assembly as claimed in claim 1, characterized in that, The self-circulating flushing sealing assembly also includes a turbulence-inducing part disposed on the inner wall of the housing and protruding into the outer cavity.

12. A self-circulating flushing method, characterized in that, The self-circulating flushing sealing assembly as described in any one of claims 1 to 11 is used, wherein the self-circulating flushing method comprises the following steps: The drive shaft rotates, and the shaft drives the rotating ring to rotate together, so that the rotating ring and the stationary ring fit together in the mechanical seal cavity to form a sealing friction pair; The rotation of the shaft drives the fluid in the inner cavity, generating a pressure difference in the inner cavity; Under the pressure difference, the fluid in the inner cavity is driven to flow into the outer cavity, and then flows back to the inner cavity through the outer cavity. During the recirculation process, the recirculated fluid is used to cool and / or lubricate the sealing friction pair.

13. A pump device, characterized in that, Includes the self-circulating flushing sealing assembly as described in any one of claims 1 to 11.

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