Sealing assembly and pump device

Abstract

The utility model provides a kind of sealing assembly and pump equipment, it is related to mechanical seal structure technical field, the sealing assembly includes sealing gland, rotating shaft, shaft sleeve, sealing pair and sealing structure, and shaft hole is equipped on sealing gland;The shaft sleeve outer wall is equipped with the shaft platform of protruding, and storage cavity is equipped between the shaft sleeve and sealing gland;Sealing pair includes static ring and dynamic ring, and there is intercommunication gap between sealing pair and shaft sleeve, and intercommunication gap connects the sealing surface between storage cavity and static ring and dynamic ring;Sealing structure includes the sealing element of being set on the shaft sleeve and with the interference fit of the shaft sleeve, sealing element abuts against shaft platform and sealing gland and can seal the gap between shaft platform and sealing gland, for keeping the sealing property of storage cavity when shaft sleeve rotates.The utility model can keep the sealing property of storage cavity in the process of shaft sleeve rotation by sealing element, and temporary liquid film can be formed in lubricating liquid in storage cavity at sealing surface, prevent sealing pair from dry grinding, improve sealing reliability and service life.

Description

Technical Field

[0001] This utility model relates to the field of mechanical seal structure technology, and in particular to a sealing component and a pump device. Background Technology

[0002] In process industries such as petrochemicals, power generation, and metallurgy, centrifugal pumps are core equipment for transporting media. Mechanical seals, as a critical component of centrifugal pumps, directly affect the safety and stable operation of the entire system. Under ideal conditions, the dynamic and stationary rings of a mechanical seal rely on a micron-sized liquid film for lubrication, cooling, and buffering, with a theoretical service life exceeding 25,000 hours. However, in actual production, dry friction of the sealing surface caused by pump idling is one of the main causes of mechanical seal failure. When the pump is idling, the sealing cavity lacks media, and the dynamic and stationary rings directly contact each other, entering a state of dry friction. Under this condition, the coefficient of friction rises sharply, generating a large amount of heat in a short time. The temperature of the sealing surface can quickly exceed 200°C, far exceeding the 120°C tolerance limit of ordinary rubber seals, leading to rapid aging, deformation, and even burnout. Simultaneously, the high temperature also causes thermal expansion and contraction of the sealing surface, generating micro-cracks that gradually expand, ultimately leading to the shattering of the sealing surface. The causes of dry running and grinding are varied, mainly including insufficient priming, incomplete venting, and blockage of the flushing pipe during startup; insufficient inlet pressure, medium vaporization, or low outlet flow leading to cavitation during operation; and operational errors such as starting the pump before opening the valve or failing to stop the pump after material venting. Existing protective measures, such as liquid level monitoring and flow switches, can only shut down the machine after the fact and cannot provide early warning. Furthermore, the self-flushing system fails during dry running and cannot cool the sealing surface. Moreover, existing sealing materials are mostly designed based on normal operating conditions and lack high-temperature resistance and wear resistance enhancement for dry running conditions. Once dry running occurs, the sealing surface is damaged within seconds and difficult to recover. Existing passive protection modes not only increase operation and maintenance costs but may also lead to fires, poisoning, and other safety accidents due to leaks, resulting in serious economic losses and safety risks. Therefore, how to prevent dry running of the sealing pair to improve sealing reliability and service life has become an urgent technical problem to be solved. Utility Model Content

[0003] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a sealing component and a pump device to prevent dry friction of the sealing pair in order to improve sealing reliability and service life.

[0004] The above-mentioned objective of this utility model can be achieved by the following technical solution: this utility model provides a sealing assembly, comprising: A sealing gland, wherein the sealing gland is provided with a shaft hole; A rotating shaft, which is rotatably inserted into the shaft hole; A bushing is fitted onto the rotating shaft and passes through the shaft hole. The outer wall of the bushing is provided with a protruding shaft platform. A closed liquid storage cavity is provided between the bushing and the sealing cap. A sealing pair, comprising a rotating ring disposed on the bushing and a stationary ring disposed on the sealing gland, wherein the rotating ring and the stationary ring are capable of fitting and sealing together, and a communication gap exists between the sealing pair and the bushing, the communication gap connecting the liquid storage chamber with the sealing surfaces between the stationary ring and the rotating ring; A sealing structure includes a sealing element that is sleeved on the bushing and press-fitted with the bushing. The sealing element is capable of abutting against the shaft platform and the sealing cap and sealing the gap between the shaft platform and the sealing cap, thereby maintaining the sealing of the liquid storage chamber when the bushing rotates.

[0005] In a preferred embodiment of the present invention, the annular gap between the inner wall of the sealing cap and the bushing forms the liquid storage cavity, the sealing element includes a sealing ring plate sleeved on the bushing, the sealing ring plate is interference-fitted with the bushing, the inner wall of the sealing cap is provided with a sealing groove, and the sealing ring plate can be embedded in the sealing groove and axially abut against the shaft.

[0006] In a preferred embodiment of the present invention, the sealing gland is provided with an annular cavity facing the bushing, the annular cavity extending through the outer end face of the sealing gland along the axial direction of the rotating shaft to form an opening, and the sealing element is disposed in the opening.

[0007] In a preferred embodiment of the present invention, the sealing element includes a sealing ring sleeve fitted on the bushing and a sealing baffle disposed around the sealing ring sleeve and axially limiting and abutting against the sealing cover. The sealing ring sleeve is interference-fitted with the bushing and abuts axially against the shaft platform. The sealing ring sleeve and the sealing baffle abut against each other and seal against each other. A first sealing ring is provided between the sealing baffle and the sealing cover.

[0008] In a preferred embodiment of the present invention, the sealing ring sleeve is provided with a radially protruding sealing portion, which can abut against the sealing baffle for sealing.

[0009] In a preferred embodiment of the present invention, the sealing part is provided with a sealing inclined surface facing the side edge of the sealing baffle, and the sealing inclined surface abuts and seals with the side edge of the sealing baffle.

[0010] In a preferred embodiment of the present invention, the sealing ring sleeve is provided with a sealing spiral groove facing the sealing baffle.

[0011] In a preferred embodiment of the present invention, the shaft platform and the bushing are integrally formed; or, the shaft platform and the bushing are fixed together by a connecting member.

[0012] In a preferred embodiment of the present invention, the sealing assembly further includes a spring seat disposed on the bushing and a spring disposed on the spring seat. The spring seat is circumferentially connected to the bushing. The moving ring is slidably disposed in the installation gap between the spring seat and the bushing and abuts against the spring. A second sealing ring is provided between the moving ring and the bushing. The stationary ring is fixed to the sealing cover. A third sealing ring is provided between the stationary ring and the sealing cover.

[0013] In a preferred embodiment of the present invention, a drive ring is fitted on the bushing, the drive ring is located outside the sealing cover, and the drive ring is circumferentially connected to the rotating shaft.

[0014] In a preferred embodiment of this utility model, the sealing cover is provided with a detachable positioning block, which can axially limit the drive ring.

[0015] In a preferred embodiment of the present invention, the sealing cap is provided with a liquid injection hole, the liquid storage cavity is connected to the liquid injection hole, the liquid injection hole is a threaded hole that penetrates the sealing cap radially along the rotating shaft, and a removable sealing plug is provided in the threaded hole.

[0016] In a preferred embodiment of the present invention, the sealing assembly further includes an air bladder, which is connected to the injection hole and is used to apply pressure to the lubricating fluid in the reservoir.

[0017] In a preferred embodiment of the present invention, the sealing assembly further includes a temperature alarm device, which is disposed on the sealing cap and is used to monitor the temperature of the sealing cap or the liquid storage chamber in real time and to issue an alarm when the temperature exceeds a preset value.

[0018] This utility model also provides a pump device, including the aforementioned sealing assembly.

[0019] In a preferred embodiment of the present invention, the pump device includes a pump housing, the pump housing is provided with an outer axial positioning surface, and an outer sealing element is provided between the sealing cover of the sealing assembly and the outer axial positioning surface. The sealing cover of the sealing assembly can abut against the outer axial positioning surface to press the outer sealing element.

[0020] The technical solution of this utility model has the following significant beneficial effects: The sealing assembly of this invention features a liquid storage chamber between the sealing gland and the bushing. Lubricating fluid can be pre-stored in this chamber through an injection hole, and the sealing element, in conjunction with the lubricant, achieves sealed storage of the lubricant, thus providing a backup lubricant for the sealing pair. When the pump experiences insufficient priming, incomplete venting, cavitation, or medium vaporization, leading to a lack of fluid in the sealing chamber, the pre-stored lubricating fluid in the storage chamber can automatically permeate the sealing surface between the rotating and stationary rings through the connecting gap, forming a temporary liquid film at the sealing surface. This provides necessary lubrication and cooling, transforming the sealing surface from a dry friction state to a liquid lubrication state, thereby extending the seal failure time window from several seconds to several minutes, gaining valuable response time for operators, and significantly improving the reliability and service life of the seal. Simultaneously, the shaft platform axially limits the sealing element, ensuring that the seal does not shift during the rotation of the bushing, thus maintaining the sealing of the storage chamber and preventing leakage of lubricating fluid due to rotational vibration, ensuring the long-term sealing performance of the storage chamber. In addition, the seal rotates together with the bushing. In the event that the sealing surface fails due to extreme working conditions, the seal can effectively prevent a large amount of pumped medium from being ejected, reducing the risk of personal injury to operators and environmental pollution. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this 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, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.

[0023] Figure 1 This is a side sectional view of one embodiment of the sealing assembly described in this utility model; Figure 2 For the appendix Figure 1 A partially enlarged schematic diagram of the sealing structure described herein; Figure 3 This is a side sectional view of another embodiment of the sealing assembly described in this utility model; Figure 4 For the appendix Figure 3 A partially enlarged schematic diagram of the sealing structure described herein.

[0024] The reference numerals in the above figures are as follows: 10. Liquid storage chamber; 20. Connectivity gap; 100. Sealing gland; 101. Outer end face; 110. Injection hole; 111. Sealing plug; 120. Sealing groove; 130. Positioning block; 131. Positioning groove; 200. Shaft; 300, bushing; 310, shaft base; 320, drive ring; 330, second set screw; 400. Sealing pair; 410. Dynamic ring; 411. Second sealing ring; 420. Stationary ring; 421. Third sealing ring; 500, Sealing structure; 510, Sealing ring; 520, Sealing ring sleeve; 521, Sealing part; 522, Sealing bevel; 523, Sealing spiral groove; 530, Sealing baffle; 540, First sealing ring; 600, Spring seat; 610, Spring; 620, First set screw; 700. Pump casing; 710. Outer axial positioning surface; 800. External seal. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Implementation Method 1

[0027] Please refer to the following: Figures 1 to 4As shown, an embodiment of this utility model provides a sealing assembly, which includes a sealing gland 100, a rotating shaft 200, a bushing 300, a sealing pair 400, and a sealing structure 500. The sealing gland 100 has a shaft hole; the rotating shaft 200 is rotatably inserted into the shaft hole; the bushing 300 is sleeved on the rotating shaft 200 and passes through the shaft hole, and the outer wall of the bushing 300 has a protruding shaft platform 310. A liquid storage cavity 10 is provided between the bushing 300 and the sealing gland 100; the sealing pair 400 includes a rotating ring 410 disposed on the bushing 300 and a sealing structure 500 disposed on the sealing gland 100. The stationary ring 420 and the rotating ring 410 on the sealing gland 100 can fit and seal with the stationary ring 420. There is a communication gap 20 between the sealing pair 400 and the bushing 300. The communication gap 20 connects the sealing surfaces between the liquid storage cavity 10 and the stationary ring 420 and the rotating ring 410. The sealing structure 500 includes a sealing element that is sleeved on the bushing 300 and has an interference fit with the bushing 300. The sealing element can abut against the shaft platform 310 and the sealing gland 100 and seal the gap between the shaft platform 310 and the sealing gland 100, so as to maintain the sealing of the liquid storage cavity 10 when the bushing 300 rotates.

[0028] Overall, the sealing assembly has a liquid storage chamber 10 between the sealing gland 100 and the bushing 300. Lubricating fluid can be pre-stored in the liquid storage chamber 10 through the injection hole 110, and the sealing element works together to achieve closed storage of the lubricating fluid, thereby providing backup lubricating fluid for the sealing pair 400. The lubricating fluid can be water, white oil, etc., and no specific restrictions are made here.

[0029] When the pump experiences insufficient priming, incomplete venting, cavitation, or medium vaporization, resulting in a lack of liquid in the sealing cavity, the pre-stored lubricating fluid in the storage chamber 10 can automatically wet the sealing surface between the moving ring 410 and the stationary ring 420 through the connecting gap 20, forming a temporary liquid film at the sealing surface to provide necessary lubrication and cooling. This changes the sealing surface from a dry friction state to a liquid lubrication state, thereby extending the time window for seal failure from several seconds to several minutes, giving operators valuable response time and significantly improving the reliability and service life of the seal.

[0030] Meanwhile, the shaft platform 310 can axially limit the sealing element, ensuring that the sealing element does not shift during the rotation of the bushing 300, preventing the lubricant in the reservoir 10 from leaking out due to the displacement of the sealing element due to rotational vibration, thus ensuring the long-term sealing performance of the reservoir 10.

[0031] The seal can rotate with the bushing 300. The seal and the shaft 310 are in a relatively stationary state. The seal can statically abut against the shaft 310 to seal. At the same time, the seal and the sealing cover 100 are in a relatively rotating state. The seal can slidably abut against the sealing cover 100 to seal, thereby completely sealing the leakage gap.

[0032] Furthermore, by incorporating seals, even if the sealing surface fails due to extreme operating conditions, the seals can effectively prevent a large amount of pumped medium from being ejected, reducing the risk of personal injury to operators and environmental pollution.

[0033] Furthermore, in industries such as petrochemicals, power generation, and metallurgy, many application environments are limited by site conditions or water supply facilities, making it impossible to provide a stable flushing water source for mechanical seals. Traditional sealing solutions struggle to guarantee operational reliability in such environments. This invention pre-injects lubricant into the storage chamber through an injection hole and stores it in a sealed manner, allowing the sealing component to have its own independent reserve lubricant. Even in remote construction sites, temporary pumping stations, or workplaces with inconvenient water supply, this sealing component can still perform its anti-dry-run protection function normally, reducing dependence on external conditions and improving adaptability to different scenarios.

[0034] It should be noted that the axial direction in this utility model refers to the axial direction of the rotating shaft 200, and the radial direction in this utility model refers to the radial direction of the rotating shaft 200.

[0035] In one feasible embodiment of this utility model, such as Figure 1 and Figure 2 In the embodiment shown, the annular gap between the inner wall of the sealing gland 100 and the bushing 300 forms a liquid storage cavity 10. The sealing element includes a sealing ring 510 sleeved on the bushing 300. The sealing ring 510 is interference-fitted with the bushing 300. The inner wall of the sealing gland 100 is provided with a sealing groove 120. The sealing ring 510 can be embedded in the sealing groove 120 and axially abut against the shaft 310.

[0036] Designers can adjust the specific material of the sealing ring 510 according to usage requirements, and no specific limitations are imposed here. Preferably, the sealing ring 510 is formed of a flexible material, such as a rubber ring. During installation, because the rubber ring is relatively soft, it can be bent and embedded into the sealing groove 120.

[0037] When the rubber ring is interference-fitted with the bushing 300, the rubber ring can rotate with the bushing 300 and seal the gap between the bushing 300 and the sealing cover 100.

[0038] Furthermore, when the shaft 200 rotates, under the action of axial force, the bushing 300 and the sealing ring 510 have a slight tendency to move towards the impeller direction, thereby reducing the pressure of the sealing ring 510 on the side wall of the sealing groove 120 and reducing wear.

[0039] Furthermore, the sealing ring 510 and the bushing 300 are interference-fitted, and the two will move synchronously under the action of axial force without separating axially, thus ensuring the sealing reliability between them.

[0040] In another feasible embodiment of this utility model, such as Figure 3 and Figure 4 In the embodiment shown, the sealing gland 100 is provided with an annular cavity facing the bushing 300. The annular cavity extends through the outer end face 101 of the sealing gland 100 along the axial direction of the rotating shaft 200 to form an opening, and the sealing element is disposed in the opening.

[0041] The area between the annular cavity and the bushing forms the reservoir 10. The annular cavity provides a larger capacity for the reservoir 10, allowing it to store more lubricant and helping to extend the time window before seal failure. Furthermore, the opening facilitates the arrangement and installation of the seal, improving ease of assembly and disassembly.

[0042] Specifically, the sealing element includes a sealing ring 520 sleeved on the bushing 300 and a sealing baffle 530 disposed around the sealing ring 520 and axially limiting and abutting against the sealing cover 100. The sealing ring 520 is interference-fitted with the bushing 300 and axially abuts against the shaft platform 310. The sealing ring 520 and the sealing baffle 530 abut against each other and seal each other. A first sealing ring 540 is provided between the sealing baffle 530 and the sealing cover 100.

[0043] By setting the sealing baffle 530, the opening can be blocked, and the sealing ring 520 can further seal the gap between the sealing baffle 530 and the bushing 300, ensuring the reliability of the seal.

[0044] When the shaft 200 rotates, under the action of axial force, the bushing 300 and the sealing ring 520 have a slight tendency to move towards the impeller, thereby reducing the pressure of the sealing ring 520 on the side wall of the sealing baffle 530 and reducing wear.

[0045] Furthermore, the sealing ring 520 and the bushing 300 are interference-fitted, and the two will move synchronously under the action of axial force without separating axially, thus ensuring the sealing reliability between them.

[0046] Designers can adjust the specific material of the sealing ring 520 according to usage requirements, and no specific limitations are imposed here. Preferably, the sealing ring 520 is molded from a flexible material, such as wear-resistant rubber. More preferably, the sealing ring 520 is made of TPU material.

[0047] By interfering with the bushing 300, the sealing ring 520 can rotate with the bushing 300 and axially abut against the shaft platform 310 on the bushing 300. This ensures that the sealing ring 520 does not shift during the rotation of the bushing 300, preventing the lubricant in the reservoir 10 from leaking due to the rotational vibration displacement of the sealing ring 520, and ensuring the long-term sealing performance of the reservoir 10.

[0048] In addition, the sealing ring 520 rotates together with the shaft sleeve 300 to form a dynamic seal. In the event that the sealing surface fails due to extreme working conditions, the sealing ring 520 can effectively prevent a large amount of pumped medium from being ejected, reducing the risk of personal injury to operators and environmental pollution.

[0049] Preferably, the sealing ring 520 has a radially protruding sealing portion 521, which can abut against the sealing baffle 530 for sealing. Specifically, the sealing ring 520 has a radially protruding sealing portion 521 at one end near the sealing pair. By providing the radially protruding sealing portion 521, the sealing portion 521 can abut against the inner end face of the sealing baffle 530, thereby the shaft platform 310 and the sealing baffle 530 can limit the sealing ring 520 at both ends, ensuring that the sealing ring 520 does not undergo axial displacement.

[0050] More preferably, the sealing part 521 is provided with a sealing bevel 522 facing the side edge of the sealing baffle 530, and the sealing bevel 522 abuts against the side edge of the sealing baffle 530 for sealing. Furthermore, the side edge of the sealing baffle 530 that mates with the sealing bevel 522 is provided with a rounded corner, and the rounded corner mates with the sealing bevel 522 to reduce wear.

[0051] By interfering with the sealing ring 520 and the bushing 300, the sealing ring 520 can rotate together with the bushing 300, and the sealing inclined surface 522 can slide against the sealing baffle 530, so that the sealing ring 520 and the sealing baffle 530 can maintain a sealing state.

[0052] Furthermore, as the bushing 300 rotates, the sealing ring 520 and the sealing ring 520 have a slight tendency to move towards the impeller, which can reduce the contact pressure between the sealing ring 520 and the sealing baffle 530 and reduce wear.

[0053] The annular gap between the sealing baffle 530 and the sealing ring 520 is small, which acts as a throttling bushing. Further, the sealing ring 520 can be extended by providing a sealing spiral groove 523 facing the sealing baffle 530.

[0054] By providing a sealing spiral groove 523 on the sealing ring 520, a certain air pressure can be generated in the sealing spiral groove 523 during the rotation of the sealing ring 520, further reducing the contact pressure between the sealing ring 520 and the sealing baffle 530 and reducing friction. Furthermore, even if some of the contact surfaces between the sealing ring 520 and the sealing baffle 530 are not fully in contact, the liquid in the liquid storage chamber 10 will not leak due to the blocking effect of the air pressure in the sealing spiral groove 523.

[0055] In the embodiments of this utility model, the designer can adjust the specific arrangement of the shaft platform 310 according to the usage needs, and no specific limitations are made here. In one feasible embodiment, the shaft platform 310 and the bushing 300 are integrally arranged. In another feasible embodiment, the shaft platform 310 and the bushing 300 are separately arranged, and the shaft platform 310 and the bushing 300 are fixed together by a connecting member.

[0056] In an embodiment of this utility model, the sealing assembly further includes a spring seat 600 disposed on the bushing 300 and a spring 610 disposed on the spring seat 600. The spring seat 600 is circumferentially limited to the bushing 300. The moving ring 410 is slidably disposed in the installation gap between the spring seat 600 and the bushing 300 and abuts against the spring 610. A second sealing ring 411 is provided between the moving ring 410 and the bushing 300. The stationary ring 420 is fixed on the sealing cover 100. A third sealing ring 421 is provided between the stationary ring 420 and the sealing cover 100.

[0057] Specifically, the spring seat 600 is fixed to the bushing 300 by the first set screw 620, and multiple springs 610 are provided and spaced in the spring seat 600. The moving ring 410 is slidably provided in the installation gap between the spring seat 600 and the bushing 300 and abuts against each spring 610.

[0058] The spring 610 can automatically compensate for the axial displacement of the moving ring 410 caused by wear or pressure changes, so that the moving ring 410 always fits against the stationary ring 420, ensuring the reliability of the seal.

[0059] As an extension, a push plate can be installed between each spring 610 and the moving ring 410, which improves the uniformity of the force applied by each spring 610 to the moving ring 410.

[0060] In an embodiment of this utility model, a drive ring 320 is fitted on the bushing 300. The drive ring 320 is located outside the sealing cover 100 and is circumferentially connected to the rotating shaft 200.

[0061] Specifically, a drive ring 320 is provided at the outer end of the bushing 300. The drive ring 320 is fixed to the rotating shaft 200 by a second set screw 330, so that the drive ring 320 and the rotating shaft 200 are circumferentially limited and connected. The bushing 300 can rotate synchronously with the rotating shaft 200 by means of the drive ring 320.

[0062] In an embodiment of this utility model, the sealing cover 100 is provided with a detachable positioning block 130, which can axially limit the drive ring 320.

[0063] Specifically, the positioning block 130 is disposed on the outer end face of the sealing cover 100, and the positioning block 130 is detachably connected to the sealing cover 100 by connecting bolts. Furthermore, the positioning block 130 is provided with a positioning groove 131, and the drive ring 320 is provided with a positioning part that matches the positioning groove 131.

[0064] The positioning part can be inserted into the positioning groove 131. The positioning block 130 can be used to position the bushing 300 and the sealing cover 100. At this time, the drive ring 320 is fixed on the rotating shaft 200 by the second set screw 330, so that the bushing 300 can be set in the preset position. Then the positioning block 130 can be removed.

[0065] In an embodiment of this utility model, the sealing cap 100 is provided with an injection hole 110, and the liquid storage cavity 10 is connected to the injection hole 110. The injection hole 110 is a threaded hole that passes through the sealing cap 100 radially along the rotating shaft 200, and a removable sealing plug 111 is provided in the threaded hole.

[0066] Specifically, the threaded hole penetrates the sealing gland 100 radially and connects to the liquid storage chamber 10. Lubricating fluid can be injected into the liquid storage chamber 10 through the threaded hole. When the liquid storage chamber 10 is full of lubricating fluid, the threaded hole can be sealed by the sealing plug 111, thereby sealing the lubricating fluid in the liquid storage chamber 10.

[0067] Designers can adjust the number and arrangement of the injection holes 110 according to usage needs, without specific restrictions. For example, multiple injection holes 110 can be provided, with multiple injection holes 110 spaced in a ring on the sealing cap 100.

[0068] In an embodiment of this utility model, the sealing assembly further includes an air bladder, which is connected to the injection hole 110 and is used to apply pressure to the lubricating fluid in the reservoir 10.

[0069] Specifically, the airbag is connected to an injection port 110 via a pipeline, and the sealing plug 111 at the injection port 110 can be replaced with a pipeline connector. By setting up the airbag, the lubricating fluid in the reservoir 10 can be pressurized, increasing the pressure of the lubricating fluid and thus enhancing the supply capacity of the lubricating fluid to the sealing surface, improving the wetting speed and coverage of the lubricating fluid. Furthermore, the airbag can adjust the pressure in real time, thereby better adapting to different working conditions.

[0070] Since the lubricant in the reservoir 10 is non-circulating, if dry friction occurs on the sealing surface, a large amount of heat will be generated in a short time when the sealing surface rotates at high speed. The liquid in the reservoir 10 will also be heated and its temperature will rise rapidly. At the same time, the temperature will be conducted to the sealing gland 100, and the temperature of the sealing gland 100 will rise rapidly. Thus, the temperature of the sealing gland 100 can be used as an indirect characterization signal of dry friction on the sealing surface.

[0071] In an embodiment of this utility model, the sealing assembly further includes a temperature alarm device, which is disposed on the sealing cap 100. The temperature alarm device is used to monitor the temperature of the sealing cap 100 or the liquid storage chamber 10 in real time and to issue an alarm when the temperature exceeds a preset value.

[0072] Designers can adjust the specific model and structure of the temperature alarm device according to the usage requirements, and no specific restrictions are imposed here.

[0073] In one specific embodiment, the temperature alarm device includes a temperature-changing sticker attached to the outer surface of the sealing gland 100. When the temperature of the sealing gland 100 rises to a set value, the temperature-changing sticker changes color, indicating to the operator that the temperature of the sealing gland 100 is too high and dry friction may occur, so that the operator can stop the pump in time for inspection and prevent the sealing surface temperature from rising further and causing damage.

[0074] In another specific embodiment, the temperature alarm device includes a thermometer, which can be installed in a liquid injection hole 110 of the sealing cap 100. The thermometer can visually measure and display the real-time temperature of the lubricating fluid in the reservoir 10, making it convenient for on-site inspectors to read and determine whether dry friction has occurred.

[0075] In another specific embodiment, the temperature alarm device includes a temperature transmitter, which can be installed in a liquid injection hole 110 of the sealing gland 100. The temperature transmitter can collect the real-time temperature of the lubricating fluid in the liquid storage chamber 10 and upload the temperature signal to the central control system for remote monitoring.

[0076] Implementation Method 2

[0077] An embodiment of this utility model provides a pump device including a sealing assembly as described in Embodiment 1. The overall structure and beneficial effects of the sealing assembly are the same as those described in Embodiment 1, and will not be repeated here.

[0078] In an embodiment of this utility model, the pump device includes a pump housing 700, an outer axial positioning surface 710 is provided on the pump housing 700, and an outer sealing element 800 is provided between the sealing cover 100 of the sealing assembly and the outer axial positioning surface 710. The sealing cover 100 of the sealing assembly can abut against the outer axial positioning surface 710 to press the outer sealing element 800.

[0079] Specifically, the sealing gland 100 is detachably mounted on the pump housing 700 by connecting bolts. The sealing gland 100 can press the outer seal 800 onto the outer axial positioning surface 710 to achieve a seal, thus ensuring the reliability of the seal between the sealing gland 100 and the pump housing 700.

[0080] 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 included by “may” 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 use of “a” or “an” to describe an element, component, part, or step is not intended to exclude other elements, components, parts, or steps.

[0081] 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 this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A sealing assembly, characterized in that, include: A sealing gland, wherein the sealing gland is provided with a shaft hole; A rotating shaft, which is rotatably inserted into the shaft hole; A bushing is fitted onto the rotating shaft and passes through the shaft hole. The outer wall of the bushing is provided with a protruding shaft platform. A closed liquid storage cavity is provided between the bushing and the sealing cap. A sealing pair, comprising a rotating ring disposed on the bushing and a stationary ring disposed on the sealing gland, wherein the rotating ring and the stationary ring are capable of fitting and sealing together, and a communication gap exists between the sealing pair and the bushing, the communication gap connecting the liquid storage chamber with the sealing surfaces between the stationary ring and the rotating ring; A sealing structure includes a sealing element that is sleeved on the bushing and press-fitted with the bushing. The sealing element is capable of abutting against the shaft platform and the sealing cap and sealing the gap between the shaft platform and the sealing cap, thereby maintaining the sealing of the liquid storage chamber when the bushing rotates.

2. The sealing assembly as claimed in claim 1, characterized in that, The annular gap between the inner wall of the sealing cap and the bushing forms the liquid storage cavity. The sealing element includes a sealing ring plate sleeved on the bushing. The sealing ring plate is interference-fitted with the bushing. The inner wall of the sealing cap is provided with a sealing groove. The sealing ring plate can be embedded in the sealing groove and abut against the shaft axially.

3. The sealing assembly as claimed in claim 1, characterized in that, The sealing gland is provided with an annular cavity facing the bushing. The annular cavity extends through the outer end face of the sealing gland along the axial direction of the rotating shaft to form an opening, and the sealing element is disposed in the opening.

4. The sealing assembly as claimed in claim 3, characterized in that, The sealing element includes a sealing ring sleeved on the bushing and a sealing baffle disposed around the sealing ring sleeve and axially limiting and abutting against the sealing cover. The sealing ring sleeve is interference-fitted with the bushing sleeve and abuts against the shaft platform axially. The sealing ring sleeve and the sealing baffle abut against each other and seal against each other. A first sealing ring is provided between the sealing baffle and the sealing cover.

5. The sealing assembly as claimed in claim 4, characterized in that, The sealing ring sleeve is provided with a radially protruding sealing part, which can abut against the sealing baffle to seal.

6. The sealing assembly as claimed in claim 5, characterized in that, The sealing part is provided with a sealing slope facing the side edge of the sealing baffle, and the sealing slope abuts against the side edge of the sealing baffle for sealing.

7. The sealing assembly as claimed in claim 4, characterized in that, The sealing ring sleeve is provided with a sealing spiral groove facing the sealing baffle.

8. The sealing assembly as claimed in claim 1, characterized in that, The shaft platform and the bushing are integrally formed; or, the shaft platform and the bushing are fixed together by a connector.

9. The sealing assembly as claimed in claim 1, characterized in that, The sealing assembly further includes a spring seat disposed on the bushing and a spring disposed on the spring seat. The spring seat is circumferentially connected to the bushing. The moving ring is slidably disposed in the installation gap between the spring seat and the bushing and abuts against the spring. A second sealing ring is provided between the moving ring and the bushing. The stationary ring is fixed on the sealing cover. A third sealing ring is provided between the stationary ring and the sealing cover.

10. The sealing assembly as claimed in claim 1, characterized in that, A drive ring is fitted onto the bushing, the drive ring is located outside the sealing cover, and the drive ring is circumferentially connected to the rotating shaft.

11. The sealing assembly as claimed in claim 10, characterized in that, The sealing cover is provided with a detachable positioning block, which can axially limit the drive ring.

12. The sealing assembly as claimed in claim 1, characterized in that, The sealing cap is provided with a liquid injection hole, and the liquid storage cavity is connected to the liquid injection hole. The liquid injection hole is a threaded hole that penetrates the sealing cap radially along the rotating shaft, and a removable sealing plug is provided in the threaded hole.

13. The sealing assembly as claimed in claim 12, characterized in that, The sealing assembly also includes an air bladder connected to the injection port, the air bladder being used to apply pressure to the lubricating fluid in the reservoir.

14. The sealing assembly as claimed in claim 1, characterized in that, The sealing assembly also includes a temperature alarm device, which is disposed on the sealing gland. The temperature alarm device is used to monitor the temperature of the sealing gland or the liquid storage chamber in real time and to issue an alarm when the temperature exceeds a preset value.

15. A pump device, characterized in that, Includes the sealing assembly as described in any one of claims 1 to 14.

16. The pump device as described in claim 15, characterized in that, The pump device includes a pump casing with an outer axial positioning surface. An outer sealing element is provided between the sealing cover of the sealing assembly and the outer axial positioning surface. The sealing cover of the sealing assembly can abut against the outer axial positioning surface to press the outer sealing element.

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