Mechanical seal structure with buffering mechanism

Abstract

The application discloses a mechanical sealing structure with a buffering mechanism and relates to the technical field of bearing platforms, which has the technical scheme as follows: the mechanical sealing structure comprises a shaft body, a fixed ring assembly and a butt joint bearing, a coaxial cover tile is arranged on the outer side of the shaft body, a bearing seat group is arranged on the outer side of the shaft body, the bearing seat group comprises a bearing platform, a plurality of axially distributed blind holes are formed in the bearing platform, one end of the bearing platform is fixedly connected with the fixed ring assembly, a clamping groove two is formed in the inner side of the bearing platform, the clamping groove two is used for limiting the fixed ring assembly, the clamping groove two is communicated with the blind holes, the fixed ring assembly comprises a fixed ring shaft sleeve, guide holes are formed in the outer side of the fixed ring shaft sleeve, and the guide holes are communicated with the blind holes. The application realizes automatic emergency plugging and intelligent early warning after sealing failure, significantly improves the heat dissipation efficiency through self-driving circulation, and prolongs the service life of equipment.

Description

Technical Field

[0001] This invention relates to the field of bearing housing technology, specifically to a mechanical seal structure with a buffer mechanism. Background Technology

[0002] In various rotating machinery, mechanical seals are usually installed in bearing housings and closely cooperate with the bearings that support the rotor, together forming the core support and sealing unit of the shaft system.

[0003] This compact structural design requires extremely high coaxiality and fitting precision between the mechanical seal, bearing, and bearing housing to ensure the stability of the equipment under high-speed operation.

[0004] CN212028353U discloses a mechanical seal for pharmaceutical equipment, which includes a housing, a bottom flange, a middle flange, a bushing, a bearing assembly, and a mechanical seal mechanism. The mechanical seal mechanism includes a mechanical seal mounting seat, a medium-side moving ring, an atmospheric-side moving ring, a medium-side stationary ring, an atmospheric-side stationary ring, a sealing collection sleeve, and a push ring. The mechanical seal mounting seat is fitted between the bushing and the housing, and the sealing collection sleeve is located below the mechanical seal mounting seat. Sealing rings are installed between the atmospheric-side moving ring and the medium-side moving ring and the mechanical seal mounting seat, between the medium-side stationary ring and the middle flange, and between the atmospheric-side stationary ring and the bearing assembly. A flushing inlet and a flushing outlet are provided on the middle flange. The device provided by this invention has a good sealing effect and prevents leakage and contamination of pharmaceuticals. However, the device lacks emergency protection for the mating clearance, and heat accumulation in the bearing housing is difficult to eliminate. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a mechanical seal structure with a buffer mechanism, which solves the problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: a mechanical seal structure with a buffer mechanism, comprising a shaft, a fixed ring assembly, and a mating bearing, wherein a coaxial cover is sleeved on the outer side of the shaft, and a bearing seat assembly is provided on the outer side of the shaft; The bearing housing assembly includes a bearing platform, and the bearing platform has multiple axially distributed blind holes; One end of the bearing platform is fixedly connected to a fixed ring assembly, and a second slot is provided on the inner side of the bearing platform. The second slot is used to limit the position of the fixed ring assembly, and the second slot communicates with a blind hole. The fixed ring assembly includes a fixed ring bushing, and a guide hole is provided on the outer side of the fixed ring bushing, which communicates with a blind hole; One of the blind holes is provided with a buffer device, which is used to buffer the blockage. The buffer device includes a top pressure shaft, a slider one, and a slider two. The slider one and slider two are slidably connected to the top pressure shaft. A constant gap is provided between the slider one and slider two, and the gap is filled with sealing filler. A spring is provided on one side of the second slider, and the first slider and the second slider move toward one side of the slot under the support of the spring. A sealing cavity is provided between the fixed ring assembly and the clamping ring assembly. The sealing cavity is filled with sealing liquid and is connected to the slot. When the sealing liquid leaks, slider one and slider two, supported by spring two, squeeze the sealing packing into the sealing cavity.

[0007] According to the above technical solution, a sealing bag is provided between the first slider and the second slider, and the sealing filler is placed inside the sealing bag.

[0008] According to the above technical solution, the blind hole is threadedly connected to a sealing screw, the top pressure shaft is fixed inside the sealing screw, and the slider two is fixedly connected to an electric control button on the side away from the sealing screw. A buffer chamber is provided between the sealing screw and the first slider, and the buffer chamber is connected to the second slot.

[0009] According to the above technical solution, the coaxial cover plate is provided with a fixed ring retaining platform and a bearing retaining platform. The fixed ring retaining platform is used to support and limit the movement ring. The bearing retaining platform is provided with multiple limiting slots. A mating bearing is provided in the slots. Hoop ring assemblies are provided on both sides of the mating bearing. The bearing platform is provided with a bearing bearing groove, which is used to limit the position of the mating bearing.

[0010] According to the above technical solution, the fixed ring assembly includes a fixed ring bushing and a fixed ring. The fixed ring bushing is fixed to one end of the bearing platform, and the fixed ring is slidably connected to the inner side of the fixed ring bushing. The fixed ring is in contact with the moving ring. The inner side of the fixed ring bushing is slidably connected to a pressure applying ring and a pressure controlling ring, and the pressure applying ring is in contact with one end of the fixed ring. A plurality of springs are provided between the pressure-applying ring and the pressure-controlling ring, and each spring applies a force toward the moving ring to the fixed ring. The fixed ring bushing is threaded to one end corresponding to the pressure control ring with a pressure control screw. The pressure control screw is used to support the pressure control ring in order to adjust the elastic force between the pressure ring and the spring. A positioning platform is provided on the outer side of the fixed ring bushing. The positioning platform corresponds to the second slot. A guide hole is provided on the positioning platform. The position of the guide hole corresponds to the splicing point of the fixed ring and the moving ring.

[0011] According to the above technical solution, a slot is provided on the bearing platform, the slot is connected to the blind hole, the slot is used to limit the position of the hoop assembly, and the slot is connected to the sealing cavity; A sliding plug is provided in part of the blind hole, and the sliding plug is slidably connected between the second slot and the first slot; The sliding plug is driven by a cooling power device, which makes it slide axially back and forth in the blind hole, and its sliding area is located between the second slot and the first slot.

[0012] According to the above technical solution, the slide plug is provided with multiple flow holes, and a rubber sheet is attached to one side of the slide plug. Under the action of the flow holes and the rubber sheet, the slide plug pushes the sealing liquid in the blind hole in one direction.

[0013] According to the above technical solution, the clamping ring assembly near the sealing cavity includes a clamping ring. The clamping ring near the sealing cavity has a first guide groove. The first guide groove has multiple second guide grooves in its cross section. The second guide grooves communicate with the blind hole when the clamping ring is placed in the first guide groove. A baffle plate is provided on the side of the clamp ring near the sealing cavity. There is a gap between the baffle plate and the clamp ring, and the baffle plate is connected to the guide groove.

[0014] According to the above technical solution, the cooling power device includes a rotary retaining ring, the coaxial cover extends out of the outer side of the bearing seat assembly, the rotary retaining ring is split and engaged on the outer side of the coaxial cover, a sliding plate is slidably connected to the rotary retaining ring, and a sliding shaft is slidably connected in a blind hole with a sliding plug, and the sliding shaft is fixedly connected to the sliding plate. The rotary retaining ring has an inclined annular guide groove, and the slide plate is provided with a pin at the position corresponding to the guide groove.

[0015] This invention provides a mechanical seal structure with a buffer mechanism. It has the following beneficial effects: In this invention, when the sealing fluid in the sealing cavity continuously leaks due to wear, causing a decrease in the cavity pressure, slider one and slider two, under the elastic support force of spring two, overcome hydraulic resistance and move towards slot two. When the slider moves past the position of slot two, slider two squeezes the sealing bag, forcing the mud-like soft packing inside the bag to rupture and be injected into the sealing cavity, forming a temporary sealing layer on the contact surface between the moving ring and the fixed ring, effectively blocking the leakage path and preventing the leakage of the medium from causing a safety accident. At the same time, the displacement of the slider eventually triggers the top pressure shaft to press the electronic control button, automatically activating the external alarm device, realizing the immediate detection and early warning of faults, and significantly improving the safety of equipment operation and the speed of maintenance response. This invention uses a shaft to drive the coaxial cover and rotary retaining ring to rotate. The inclined annular guide groove on the rotary retaining ring drives the pin and slide plate to reciprocate axially, which in turn drives the sliding shaft and the sliding plug to slide back and forth in the blind hole. In conjunction with the flow hole on the sliding plug and the one-way valve structure formed by the rubber sheet, the high-temperature sealing fluid in the sealing cavity is forced to be drawn into the blind hole and the bearing housing assembly for circulation. The metal body of the bearing housing assembly is used as the heat exchange medium, which increases the heat exchange area of ​​the sealing fluid and effectively removes the heat generated by the friction of the mechanical seal end face and the operation of the bearing. This ensures that the sealing assembly and the bearing are always in a suitable operating temperature range, thus extending the service life of the seal. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram showing a partial cross-section of the entire structure of the present invention; Figure 3 This is a schematic diagram of the overall half-section structure of the present invention; Figure 4 This is a schematic diagram of the overall bearing housing assembly of the present invention; Figure 5 This is a schematic diagram of the single-ring structure of the integral bearing housing assembly of the present invention; Figure 6 This is a schematic diagram of the overall fixed ring assembly and the mating bearing of the present invention; Figure 7 This is a schematic diagram of a single-ring structure of the overall fixed-ring assembly of the present invention; Figure 8 This invention as a whole Figure 3 A schematic diagram of the structure of area A; Figure 9 This is a schematic diagram of a single ring structure of the overall hoop assembly of the present invention; Figure 10 This is a schematic diagram of the stepped cross-sectional structure of the integral slide of the present invention; Figure 11 This invention as a whole Figure 10 A schematic diagram of the structure of area B; Figure 12 This is a schematic diagram of the stepped cross-sectional structure of the overall buffer device of the present invention; Figure 13 This is a schematic diagram of the overall sliding plug structure of the present invention; Figure 14 This is a schematic diagram of the overall buffer device of the present invention.

[0017] In the diagram: 1. Shaft; 2. Bearing housing assembly; 201. Bearing base; 202. Blind hole; 203. Slot 1; 204. Bearing bearing slot; 205. Slot 2; 3. Fixed ring assembly; 301. Fixed ring bushing; 302. Positioning platform; 303. Guide hole; 304. Spring 1; 305. Pressure control ring; 306. Pressure control screw; 307. Fixed ring; 308. Pressure application ring; 4. Butt bearings; 5. Coaxial cover plates; 7. Clamping ring assembly; 701. Clamping ring; 702. Baffle plate; 703. Flow guide channel one; 704. Flow guide channel two; 8. Buffer device; 801. Sealing screw; 802. Top pressure shaft; 803. Slider one; 804. Slider two; 805. Sealing bag; 806. Spring two; 807. Electric control button; 808. Buffer chamber; 9. Cooling power unit; 901. Rotary retaining ring; 902. Carrying plate; 903. Guide groove; 904. Sliding shaft; 10. Sealing cavity; 11. Sliding plug; 12. Flow hole; 13. Rubber sheet; 14. Moving ring; 15. Fixed ring retainer; 16. Bearing retainer. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0019] Please see Figure 1-14 A mechanical seal structure with a buffer mechanism includes a shaft body 1, a fixed ring assembly 3, and a mating bearing 4. The outer side of the shaft body 1 is fitted with a coaxial cover 5, and the outer side of the shaft body 1 is provided with a bearing seat assembly 2. The bearing housing assembly 2 includes a bearing base 201, on which a plurality of axially distributed blind holes 202 are provided; One end of the bearing platform 201 is fixedly connected to the fixed ring assembly 3. The inner side of the bearing platform 201 is provided with a second groove 205, which is used to limit the fixed ring assembly 3. The second groove 205 is connected to the blind hole 202. The fixed ring assembly 3 includes a fixed ring bushing 301, and a guide hole 303 is provided on the outer side of the fixed ring bushing 301. The guide hole 303 communicates with the blind hole 202. One of the blind holes 202 is equipped with a buffer device 8, which is used for buffering and sealing. The buffer device 8 includes a top pressure shaft 802, a first slider 803, and a second slider 804. The first slider 803 and the second slider 804 are slidably connected to the top pressure shaft 802. A constant gap is provided between the first slider 803 and the second slider 804, and the gap is filled with sealing filler. A spring 806 is provided on one side of slider 2 804. Slider 1 803 and slider 2 804 move toward one side of slot 2 205 under the support of spring 2 806. A sealing cavity 10 is provided between the fixed ring assembly 3 and the clamping ring assembly 7. The sealing cavity 10 is filled with sealing liquid and is connected to the second groove 205.

[0020] When the sealing fluid leaks, slider 1 (803) and slider 2 (804), supported by spring 2 (806), squeeze the sealing packing into the sealing cavity 10.

[0021] Furthermore, the joint between the second slot 205 and the moving ring 14 corresponds.

[0022] Furthermore, the fixed ring assembly 3, the mating bearing 4, and the coaxial cover 5 are all split-joint structures with sealing strips on their joint surfaces. This solution is existing technology and will not be elaborated further.

[0023] Furthermore, when the sealing cavity 10 is filled with sealing fluid, since the sealing cavity 10 is a closed environment, the slider 803 is supported by the spring 806 and squeezes the sealing fluid in the sealing cavity 10. When the sealing fluid does not leak, the slider 803 will not slide.

[0024] Furthermore, mud-like soft packing material is selected for plugging.

[0025] Furthermore, the enclosed space formed by slider 2 804 and spring 2 806 can be filled with high-pressure gas and liquid.

[0026] During use, when the fixed ring 307 on the fixed ring assembly 3 and the moving ring 14 on the coaxial cover 5 work for a long time and wear occurs, the sealing fluid in the sealing cavity 10 will leak from the worn area toward the outside of the bearing housing assembly 2. As this process continues, the sealing fluid in the sealing cavity 10 will continue to decrease. The slider 1 803 and slider 2 804 will continue to move toward the slot 2 205 under the support of the spring 2 806. When the slider 1 803 passes the slot 2 205, the sealing filler between the slider 1 803 and slider 2 804 will be squeezed into the sealing cavity 10 by the slot 2 205 and act on the contact surface of the fixed ring 307 and the moving ring 14. As the shaft 1 rotates, the sealing filler will cover the contact surface of the fixed ring 307 and the moving ring 14, thereby temporarily sealing the leakage surface of the moving ring 14 and the fixed ring 307.

[0027] A sealing bag 805 is provided between slider 1 803 and slider 2 804, and the sealing filler is placed inside the sealing bag 805.

[0028] Furthermore, the sealing bag 805 is designed to extend the storage life of the sealing packing.

[0029] When in use, when slider 1 803 passes over slot 2 205, slider 2 804 squeezes the sealing filler in the sealing bag 805, causing plastic deformation at the position corresponding to slot 2 205, and as it is squeezed and broken, the sealing filler is pushed into the sealing cavity 10.

[0030] The blind hole 202 is threadedly connected to a sealing screw 801, the top pressure shaft 802 is fixed inside the sealing screw 801, and the slider 2 804 is fixedly connected to an electric control button 807 on the side away from the sealing screw 801. A buffer chamber 808 is provided between the sealing screw 801 and the slider 803, and the buffer chamber 808 is connected to the slot 205.

[0031] Furthermore, the buffer chamber 808 is connected to the sealing cavity 10 through the second slot 205. When the sealing fluid is filled into the sealing cavity 10, the buffer chamber 808 is filled with sealing fluid. Since the sealing cavity 10 is a sealed space, the sealing fluid in the buffer chamber 808 cannot flow when there is no leakage. At this time, the sealing fluid in the buffer chamber 808 will block and limit the slider 803. When the sealing fluid in the sealing cavity 10 is slightly lost, the sealing fluid in the buffer chamber 808 can replenish the sealing cavity 10 to a certain extent. When the sealing fluid in the sealing cavity 10 leaks continuously, after the sealing fluid in the buffer chamber 808 is delivered to the sealing cavity 10, the sealing filler is squeezed into the sealing cavity 10.

[0032] Furthermore, the electronically controlled button 807 has alarm devices such as a buzzer, an alarm light, and an electrically controllable shaft 1, which is used for alarm maintenance.

[0033] Furthermore, the top pressure shaft 802 passes through slider one 803 and slider two 804, and there is a gap between it and the electronic control button 807 on slider two 804.

[0034] When the sealing fluid in the sealing cavity 10 leaks continuously during use, the slider 803 continues to pass over the slot 205 as the sealing fluid leaks. Then, when the sealing packing is squeezed and delivered into the sealing cavity 10, the top pressure shaft 802 contacts the electric control button 807 and presses the electric control button 807 to trigger an alarm.

[0035] The coaxial cover plate 5 is provided with a fixed ring retaining platform 15 and a bearing retaining platform 16. The fixed ring retaining platform 15 is used to support and limit the moving ring 14. The bearing retaining platform 16 is provided with multiple limiting slots. The slots are provided with a mating bearing 4. The mating bearing 4 is provided with a hoop ring assembly 7 on both sides. The bearing platform 201 is provided with a bearing bearing groove 204, which is used to limit the position of the mating bearing 4.

[0036] The fixed ring assembly 3 includes a fixed ring bushing 301 and a fixed ring 307. The fixed ring bushing 301 is fixed to one end of the bearing base 201, and the fixed ring 307 is slidably connected to the inner side of the fixed ring bushing 301. The fixed ring 307 is in contact with the moving ring 14. The inner side of the fixed ring bushing 301 is slidably connected with a pressure ring 308 and a pressure control ring 305, with the pressure ring 308 fitting against one end of the fixed ring 307; Multiple springs 304 are provided between the pressure ring 308 and the pressure control ring 305. The springs 304 apply a force to the fixed ring 307 toward the moving ring 14. The fixed ring bushing 301 is threaded to one end of the pressure control ring 305, and the pressure control screw 306 is used to support the pressure control ring 305 to adjust the elastic force between the pressure ring 308 and the spring 304. A positioning platform 302 is provided on the outer side of the fixed ring bushing 301. The positioning platform 302 corresponds to the second slot 205. A guide hole 303 is provided on the positioning platform 302. The position of the guide hole 303 corresponds to the splicing point of the fixed ring 307 and the moving ring 14.

[0037] Furthermore, a flow gap is provided between the fixed ring bushing 301 and the moving ring 14.

[0038] Furthermore, the positioning platform 302 has inclined surfaces on both sides for easy installation.

[0039] In use, after the fixed ring bushing 301 and fixed ring 307 are engaged with the corresponding positions of the moving ring 14 on the coaxial cover 5, the pressure control ring 305 is squeezed by rotating the pressure control screw 306, thereby reducing the gap between the pressure control ring 305 and the pressure application ring 308, increasing the compression of the spring 304, thereby increasing the pressure between the fixed ring 307 and the moving ring 14, and enhancing the sealing effect of the fixed ring 307 and the moving ring 14.

[0040] The bearing platform 201 is provided with a slot 203, which is connected to the blind hole 202. The slot 203 is used to limit the position of the hoop assembly 7 and is connected to the sealing cavity 10. A sliding plug 11 is provided in some blind holes 202, and the sliding plug 11 is slidably connected between the second slot 205 and the first slot 203; The sliding plug 11 is driven by the cooling power unit 9, which makes it slide axially back and forth in the blind hole 202. Its sliding area is located between the second slot 205 and the first slot 203.

[0041] Furthermore, multiple blind holes 202 are opened on the bearing platform 201. Some of the blind holes 202 are equipped with buffer devices 8, and other blind holes 202 are slidably connected with sliding plugs 11. The blind holes 202 equipped with buffer devices 8 are blocked from communicating with the slot 203.

[0042] Furthermore, heat dissipation fins can be added to the outer side of the bearing platform 201 corresponding to the external location of the blind hole 202 to assist in the cooling of the sealing fluid and increase the heat dissipation effect.

[0043] In use, when the sliding plug 11 slides from the side of the first slot 203 toward the side of the second slot 205, the sealing fluid on the side of the sliding plug 11 near the second slot 205 is transported to the sealing cavity 10 through the second slot 205. The sealing fluid on the side of the shaft 1 near the first slot 203 is drawn into the blind hole 202 through the first slot 203. This realizes that the sealing fluid in the sealing cavity 10 and the blind hole 202 enters the blind hole 202 with the interaction of the sliding plug 11. The heat conduction effect is increased through the blind hole 202, the heat dissipation efficiency is improved, and the fixed ring assembly 3 and the mating bearing 4 are in a suitable temperature range.

[0044] The slide plug 11 has multiple flow holes 12, and a rubber sheet 13 is attached to one side of the slide plug 11. Under the action of the flow holes 12 and the rubber sheet 13, the slide plug 11 pushes the sealing liquid in the blind hole 202 in one direction.

[0045] In use, when the sliding plug 11 moves toward the slot 1 203 side, the sealing liquid on the slot 1 203 side will flow through the flow hole 12 and support the rubber sheet 13, flowing into the slot 2 205 side. When the sliding plug 11 moves from the slot 1 203 side toward the slot 2 205 side, it blocks the flow hole 12, forming a certain unidirectional flow structure, ensuring that the sealing liquid in the sealing cavity 10 and the blind hole 202 mainly flows in the direction from the slot 1 203 to the slot 2 205.

[0046] The clamping ring assembly 7 near the sealing cavity 10 includes a clamping ring 701. A first guide groove 703 is provided on the side of the clamping ring 701 near the sealing cavity 10. A plurality of second guide grooves 704 are provided on the cross section of the first guide groove 703. When the clamping ring 701 is placed in the first groove 703, the second guide groove 704 communicates with the blind hole 202. A baffle plate 702 is provided to cover the side of the clamp ring 701 near the sealing cavity 10. There is a gap between the baffle plate 702 and the clamp ring 701, and it is connected to the guide groove 703.

[0047] Furthermore, there is a gap between the baffle plate 702 and the clamping ring 701 within the inner ring of the clamping ring 701.

[0048] When in use, as the sliding plug 11 moves from the side of the first slot 203 toward the side of the second slot 205, the sealing fluid will be drawn into the first slot 203 due to the sealing of the rubber sheet 13. At this time, the sealing fluid in the sealing cavity 10 enters the first guide groove 703 through the gap between the clamping ring 701 and the inner ring of the baffle plate 702, and is then input into the first slot 203 through the second guide groove 704. This increases the flow contact surface between the sealing fluid and the clamping ring 701, enhances the heat conduction effect of the clamping ring 701, and keeps the mating bearing 4 in a suitable working state.

[0049] The cooling power unit 9 includes a rotary retaining ring 901, a coaxial cover 5 extending out of the outer side of the bearing housing assembly 2, the rotary retaining ring 901 being snapped into the outer side of the coaxial cover 5, a sliding plate 902 being slidably connected to the rotary retaining ring 901, and a sliding shaft 904 being slidably connected in a blind hole 202 with a sliding plug 11, the sliding shaft 904 being fixedly connected to the sliding plate 902; The rotary retaining ring 901 has an inclined annular guide groove 903, and the slide plate 902 is provided with a pin at the position corresponding to the guide groove 903.

[0050] Furthermore, the coaxial cover 5 is connected to the shaft 1 by the clamping of the hoop assembly 7.

[0051] Furthermore, the swivel retaining ring 901 is secured to the outside of the coaxial cover 5 by a screw clamp and rotates synchronously with the coaxial cover 5.

[0052] In use, when the shaft 1 rotates, it drives the coaxial cover 5 to rotate, which in turn drives the rotary retainer 901 to rotate. When the rotary retainer 901 rotates, the pin on the slide plate 902 slides along the guide groove 903, thereby dragging the slide plate 902 to slide axially back and forth. This drags the slide shaft 904 and the slide plug 11 to slide axially back and forth in the blind hole 202, causing the sealing fluid in the sealing cavity 10 to circulate into the blind hole 202 under the drag of the slide plug 11, which facilitates the circulation of the sealing fluid and the heat dissipation of the bearing.

[0053] Working principle: When the mechanical seal structure is working, the shaft 1 rotates and drives the coaxial cover 5 and the moving ring 14 to rotate synchronously. The moving ring 14 and the end face of the fixed ring 307 on the fixed ring assembly 3 fit together to form a sealing cavity 10. The sealing cavity 10 is filled with sealing fluid, and the compression of the spring 304 is adjusted by the pressure control screw 306 to maintain the end face specific pressure. When the fixed ring 307 and the moving ring 14 wear down after long-term operation, causing the sealing fluid in the sealing cavity 10 to continuously leak outward, the slider 1 803 and slider 2 804 in the buffer device 8 continuously move towards the slot 2 205 under the support of the spring 2 806. When slider 1 803 passes the slot 2 205, slider 2 804 squeezes the sealing packing in the sealing bag 805, causing it to undergo plastic deformation and break, pushing the mud-like soft packing into the sealing cavity 10 to cover the contact surface between the moving ring 14 and the fixed ring 307, thereby achieving temporary leakage sealing. At the same time, the movement of slider 2 804 will trigger the top pressure shaft 802 to press the electric control button 807, activating the alarm device for alarm maintenance. In addition, the rotation of the shaft 1 drives the rotary retainer 901 to rotate synchronously. The pin on the rotary retainer 901 slides in the annular guide groove 903, thereby dragging the slide plate 902 and the sliding shaft 904 to slide axially back and forth in the blind hole 202, driving the slide plug 11 to reciprocate. The slide plug 11, together with the flow hole 12 and the rubber sheet 13, forms a one-way flow structure, drawing the sealing liquid in the sealing cavity 10 into the blind hole 202 for circulation. The heat conduction effect is increased through the blind hole 202 and the heat dissipation fins, effectively removing frictional heat and ensuring that the fixed ring assembly 3 and the mating bearing 4 are in a suitable working temperature range.

[0054] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A mechanical seal structure with a buffer mechanism, comprising a shaft (1), a retaining ring assembly (3), and a mating bearing (4), characterized in that: The outer side of the shaft (1) is fitted with a coaxial cover (5), and the outer side of the shaft (1) is provided with a bearing seat assembly (2). The bearing housing assembly (2) includes a bearing base (201), and the bearing base (201) has a plurality of axially distributed blind holes (202). One end of the bearing platform (201) is fixedly connected to a fixed ring assembly (3). A second slot (205) is provided on the inner side of the bearing platform (201). The second slot (205) is used to limit the fixed ring assembly (3). The second slot (205) is connected to the blind hole (202). The fixed ring assembly (3) includes a fixed ring bushing (301), and a guide hole (303) is provided on the outer side of the fixed ring bushing (301), which is connected to a blind hole (202). A buffer device (8) is provided in one of the blind holes (202), the buffer device (8) being used for buffering and sealing; The buffer device (8) includes a top pressure shaft (802), a slider one (803), and a slider two (804). The slider one (803) and slider two (804) are slidably connected to the top pressure shaft (802). A constant gap is provided between the slider one (803) and slider two (804), and the gap is filled with sealing filler. A spring (806) is provided on one side of the second slider (804), and the first slider (803) and the second slider (804) move toward one side of the slot (205) under the support of the second spring (806). A sealing cavity (10) is provided between the fixed ring assembly (3) and the clamping ring assembly (7), the sealing cavity (10) is filled with sealing liquid, and the sealing cavity (10) is connected to the second slot (205); When the sealing liquid leaks, slider one (803) and slider two (804), supported by spring two (806), squeeze the sealing packing into the sealing cavity (10).

2. The mechanical seal structure with a buffer mechanism according to claim 1, characterized in that: A sealing bag (805) is provided between slider one (803) and slider two (804), and the sealing filler is provided inside the sealing bag (805).

3. The mechanical seal structure with a buffer mechanism according to claim 1, characterized in that: The blind hole (202) is threadedly connected to a plugging screw (801), the top pressure shaft (802) is fixed inside the plugging screw (801), and the slider two (804) is fixedly connected to an electric control button (807) on the side away from the plugging screw (801). A buffer chamber (808) is provided between the sealing screw (801) and the first slider (803), and the buffer chamber (808) is connected to the second slot (205).

4. The mechanical seal structure with a buffer mechanism according to claim 1, characterized in that: The coaxial cover plate (5) is provided with a fixed ring clamping platform (15) and a bearing clamping platform (16). The fixed ring clamping platform (15) is used to support and limit the moving ring (14). The bearing clamping platform (16) is provided with multiple limiting grooves. A docking bearing (4) is provided in the groove. Hoop ring assemblies (7) are provided on both sides of the docking bearing (4). The bearing platform (201) is provided with a bearing bearing groove (204), which is used to limit the position of the mating bearing (4).

5. A mechanical seal structure with a buffer mechanism according to claim 4, characterized in that: The fixed ring assembly (3) includes a fixed ring bushing (301) and a fixed ring (307). The fixed ring bushing (301) is fixed at one end of the bearing base (201), and the fixed ring (307) is slidably connected to the inner side of the fixed ring bushing (301). The fixed ring (307) is in contact with the moving ring (14). The inner side of the fixed ring bushing (301) is slidably connected with a pressure ring (308) and a pressure control ring (305), and the pressure ring (308) is in contact with one end of the fixed ring (307); A plurality of springs (304) are provided between the pressure ring (308) and the pressure control ring (305), and the springs (304) apply a force to the fixed ring (307) toward the moving ring (14); The fixed ring bushing (301) is threaded with a pressure control screw (306) at one end corresponding to the pressure control ring (305). The pressure control screw (306) is used to support the pressure control ring (305) to adjust the elastic force between the pressure application ring (308) and the spring (304). A positioning platform (302) is provided on the outside of the fixed ring bushing (301). The positioning platform (302) corresponds to the second slot (205). A guide hole (303) is provided on the positioning platform (302). The position of the guide hole (303) corresponds to the splicing point of the fixed ring (307) and the moving ring (14).

6. A mechanical seal structure with a buffer mechanism according to claim 5, characterized in that: The bearing platform (201) is provided with a slot (203), which is connected to the blind hole (202). The slot (203) is used to limit the position of the hoop assembly (7). The slot (203) is connected to the sealing cavity (10). A sliding plug (11) is provided in part of the blind hole (202), and the sliding plug (11) is slidably connected between the second slot (205) and the first slot (203); The sliding plug (11) is driven by the cooling power device (9) to slide axially back and forth in the blind hole (202), and its sliding area is located between the second slot (205) and the first slot (203).

7. A mechanical seal structure with a buffer mechanism according to claim 6, characterized in that: The slide plug (11) has multiple flow holes (12) and a rubber sheet (13) is attached to one side of the slide plug (11). Under the action of the flow holes (12) and the rubber sheet (13), the slide plug (11) pushes the sealing liquid in the blind hole (202) in one direction.

8. A mechanical seal structure with a buffer mechanism according to claim 5, characterized in that: The clamping ring assembly (7) near the sealing cavity (10) includes a clamping ring (701). The clamping ring (701) near the sealing cavity (10) has a flow guide groove (703). The flow guide groove (703) has multiple flow guide grooves (704) in its cross section. The flow guide grooves (704) communicate with the blind hole (202) when the clamping ring (701) is placed in the groove (203). The clamping ring (701) is covered with a baffle plate (702) on the side near the sealing cavity (10). There is a gap between the baffle plate (702) and the clamping ring (701), and it is connected to the guide groove (703).

9. A mechanical seal structure with a buffer mechanism according to claim 5, characterized in that: The cooling power unit (9) includes a rotary retaining ring (901), the coaxial cover (5) extends out of the outer side of the bearing seat assembly (2), the rotary retaining ring (901) is snapped into the outer side of the coaxial cover (5), a slide plate (902) is slidably connected to the rotary retaining ring (901), and a slide shaft (904) is slidably connected in the blind hole (202) provided with a slide plug (11), and the slide shaft (904) is fixedly connected to the slide plate (902); The rotary retaining ring (901) has an inclined annular guide groove (903), and the slide plate (902) is provided with a pin at the position corresponding to the guide groove (903).

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