Internal flush double mechanical seal

Abstract

This utility model provides an internal flushing double-end-face mechanical seal, including a rotating shaft with two rotating rings. A stationary ring seat is fitted on the outer side of the rotating shaft, and two stationary rings are mounted on the stationary ring seat. The end faces of the rotating and stationary rings are in contact with each other and cooperate. A sealing cavity is formed between the rotating rings, stationary rings, stationary ring seat, and rotating shaft. A flow guiding assembly is provided inside the sealing cavity. The flow guiding assembly includes rotating and stationary flow guiding rings. Several rotating flow guiding rings are circumferentially spaced on the outer wall of the rotating shaft, and several stationary flow guiding rings are circumferentially spaced on the inner wall of the stationary ring seat. The rotating and stationary flow guiding rings are spaced apart to form staggered flow channels. The rotating and stationary flow guiding rings work together to force the flushing coolant in the sealing cavity to form a strong vortex and directional flow, ensuring that it can be directly delivered to the vicinity of the two friction end faces, carrying away the tiny wear particles and a large amount of heat generated by the end face friction, realizing the circulation flushing and cooling of the flushing coolant inside the sealing cavity; belonging to the field of mechanical seal technology.

Description

Technical Field

[0001] This utility model relates to the field of mechanical seal technology, and in particular to an internal flushing double-end mechanical seal. Background Technology

[0002] A double-end mechanical seal is a device that forms a double sealing barrier through two pairs of relatively stationary sealing end faces. It utilizes the fact that the pressure of the intermediate insulating fluid (such as lubricating oil or buffer solution) is higher than the pressure of the sealed medium to prevent leakage and remove frictional heat. Compared to single-end seals, double-end mechanical seals are more reliable and suitable for sealing toxic, volatile, or hazardous media. They are widely used in high-risk equipment such as process pumps, reactors, and compressors in the chemical and petrochemical industries.

[0003] During operation, the stationary and rotating rings of a double-end mechanical seal generate tiny abrasive particles through prolonged contact and friction. These particles accumulate on the end faces of the stationary and rotating rings, causing scratches. Furthermore, prolonged contact and friction between the stationary and rotating rings also generates heat accumulation, which reduces the sealing performance of the seal. Therefore, a double-end mechanical seal is needed that can both prevent abrasive particles from scratching the end faces and reduce heat generation. Utility Model Content

[0004] The purpose of this application is to provide an internally flushed double-end mechanical seal, which aims to solve the technical problems of wear particles scratching the end face and heat accumulation in existing double-end mechanical seals during use.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: An internal flushing double-end-face mechanical seal is provided, including a rotating shaft with two rotating rings on it. A stationary ring seat is fitted on the outer side of the rotating shaft, and two stationary rings are provided on the stationary ring seat. The end faces of the rotating rings and the stationary rings are in contact with each other and cooperate. A sealing cavity is formed between the rotating rings, the stationary rings, the stationary ring seat, and the rotating shaft. A flow guiding assembly is provided within the sealing cavity. The flow guiding assembly includes a rotating flow guiding ring and stationary flow guiding rings. A plurality of rotating flow guiding rings are circumferentially spaced on the outer wall of the rotating shaft, and a plurality of stationary flow guiding rings are circumferentially spaced on the inner wall of the stationary ring seat. The rotating flow guiding rings and the stationary flow guiding rings are spaced apart to form staggered flow channels.

[0006] In one embodiment, both the moving guide ring and the stationary guide ring are inclined, with the moving guide ring inclined toward one of the stationary rings and the stationary guide ring inclined toward the other stationary ring.

[0007] In one embodiment, the dynamic guide ring and the static guide ring are spaced apart, with a vertical gap of 5-10 mm.

[0008] In one embodiment, there are two stationary ring seats, and a cavity is provided between the two stationary ring seats. A compensating spring is provided in the cavity, and the two ends of the compensating spring are respectively connected to the two stationary ring seats. The two stationary rings are respectively disposed on the corresponding stationary ring seats.

[0009] In one embodiment, a fixed seat is sleeved on the outer side of the two stationary ring seats, the stationary ring seats are slidably connected to the fixed seat, and the fixed seat is provided with a liquid inlet and a liquid outlet, both of which are connected to the sealing cavity through the cavity.

[0010] In one embodiment, a first sealing element is provided at the connection between the stationary ring seat and the fixed seat.

[0011] In one embodiment, the surfaces of the sealing cavity, the cavity, and the compensating spring are all provided with a corrosion-resistant coating.

[0012] In one embodiment, the stationary ring seat is further provided with a blocking component, the blocking component including two blocking sleeves, one end of the blocking sleeve is disposed on the corresponding stationary ring seat, the blocking sleeve covers the outer side of the moving ring and the stationary ring, the inner side of the blocking sleeve is provided with a blocking ring, the blocking ring is sleeved on the outer side of the rotating shaft, the inner side of the blocking ring is provided with a thread, and the thread is spaced apart from the rotating shaft.

[0013] In one embodiment, the gap between the end of the thread and the shaft is 0.2-1 mm.

[0014] In one embodiment, a second seal is provided at the connection between the moving ring and the rotating shaft.

[0015] This invention provides an internally flushed double-end-face mechanical seal. Compared with existing technologies, its advantages are as follows: By setting a flow guiding component, with the dynamic and static flow guiding rings working together, when the shaft rotates, the dynamic flow guiding ring fixed on the shaft drives the flushing coolant in the sealing cavity to rotate as well. When the rotating flushing coolant encounters the static flow guiding ring, its flow is guided. Under the combined action of the dynamic and static flow guiding rings, the flushing coolant in the sealing cavity is forced to form a strong vortex and directional flow, ensuring that the flushing coolant can be directly delivered to the vicinity of the two friction end faces. The high-speed flowing liquid flushes the friction end faces, carrying away the tiny wear particles generated by the end face friction, preventing them from accumulating on the end faces and causing scratches. The high-speed flowing liquid also carries away a large amount of heat generated by the end face friction, achieving efficient cooling of the end faces. As long as the shaft rotates, the flow guiding component will drive the flushing coolant to circulate and cool inside the sealing cavity.

[0016] This invention integrates flushing and cooling functions inside the mechanical seal, reducing complex external pipelines and fittings, resulting in a simple and compact structure. The flushing power comes directly from the rotation of the main shaft, eliminating the need for an additional power source, thus saving energy and increasing efficiency. The flushing flow acts directly on the friction surfaces that generate heat and wear, resulting in good flushing and cleaning effects, good heat dissipation, high efficiency, and high practicality. It is particularly suitable for handling high-temperature, easily vaporized, or particulate-containing media. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A cross-sectional structural schematic diagram of an internal flushing double-end mechanical seal provided in an embodiment of this application; Figure 2 for Figure 1 The enlarged structural diagram of point A of the internal flushing double-end mechanical seal is shown. Figure 3 for Figure 1 The enlarged structural diagram of point B of the internal flushing double-end mechanical seal is shown. Figure 4 for Figure 1 The diagram shows an enlarged view of the internal flushing double-end mechanical seal at point C.

[0019] Explanation of symbols in the diagram: 1. Rotating shaft; 2. Moving ring; 3. Stationary ring; 4. Stationary ring seat; 5. Sealing cavity; 6. Flow guiding assembly; 601. Moving flow guiding ring; 602. Stationary flow guiding ring; 7. Fixed seat; 8. Liquid inlet; 9. Liquid outlet; 10. First seal; 11. Barrier assembly; 1101. Barrier sleeve; 1102. Barrier ring; 1103. Thread; 12. Cavity; 13. Compensating spring; 14. Second seal. Detailed Implementation

[0020] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0021] It should be noted that when a component is referred to as being "fixed" or "set" to another component, it can be directly or indirectly attached to that other component. When a component is referred to as being "connected" to another component, it can be directly or indirectly connected to that other component.

[0022] It should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and should not be construed as indicating or implying that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] Please see Figure 1 This is a cross-sectional structural diagram of an internal flushing double-end mechanical seal according to an embodiment of this application. For ease of explanation, only the parts relevant to this embodiment are shown, which are described in detail below: In one embodiment, please refer to Figure 2 An internal flushing double-end mechanical seal includes a rotating shaft 1, on which two rotating rings 2 are provided. A stationary ring seat 4 is fitted on the outer side of the rotating shaft 1, and two stationary rings 3 are provided on the stationary ring seat 4. The end faces of the rotating rings 2 and stationary rings 3 are in contact with each other and cooperate. A sealing cavity 5 is formed between the rotating rings 2, stationary rings 3, stationary ring seat 4 and the rotating shaft 1. Flushing coolant is introduced into the sealing cavity 5. A flow guiding assembly 6 is provided in the sealing cavity 5. The flow guiding assembly 6 includes a rotating flow guiding ring 601 and a stationary flow guiding ring 602. A number of rotating flow guiding rings 601 are circumferentially spaced on the outer wall of the rotating shaft 1, and a number of stationary flow guiding rings 602 are circumferentially spaced on the inner wall of the stationary ring seat 4. The rotating flow guiding rings 601 and stationary flow guiding rings 602 are spaced apart to form staggered flow channels.

[0024] By setting up the flow guiding component 6, the moving flow guiding ring 601 and the stationary flow guiding ring 602 work together. When the rotating shaft 1 rotates, the moving flow guiding ring 601, fixed on the rotating shaft 1, drives the flushing coolant in the sealing cavity 5 to rotate together. When the rotating flushing coolant encounters the stationary flow guiding ring 602, its flow is guided. Under the combined action of the moving flow guiding ring 601 and the stationary flow guiding ring 602, the flushing coolant in the sealing cavity 5 is forced to form a strong vortex and directional flow, ensuring that the flushing coolant can be directly delivered to the vicinity of the two friction end faces. The high-speed flowing liquid flushes the friction end faces, carrying away the tiny wear particles generated by the end face friction, preventing them from accumulating on the end faces and causing scratches. The high-speed flowing liquid also carries away a large amount of heat generated by the end face friction, achieving efficient cooling of the end faces. As long as the rotating shaft 1 is rotating, the flow guiding component 6 will drive the flushing coolant to circulate and cool inside the sealing cavity 5.

[0025] For details, please refer to Figures 1-2 Both the moving guide ring 601 and the stationary guide ring 602 are inclined. The moving guide ring 601 is inclined towards one of the stationary rings 3, and the stationary guide ring 602 is inclined towards the other stationary ring 3. The inclined moving guide ring 601 and stationary guide ring 602 provide a clear axial thrust for the flushing coolant. When flushing coolant is introduced into the sealing cavity 5, the moving guide ring 601 drives the flushing coolant from the middle of the sealing cavity 5, flowing in one direction towards one of the stationary rings 3, flushing one end face. After that, the flushing coolant flows back under the action of the stationary guide ring 602, and then flows to the other end of the stationary ring 3, forming a highly efficient cooling circuit covering the entire sealing cavity 5. The directional flow ensures that the flushing coolant can accurately reach the end face area that needs cooling and flushing the most, avoiding flow dead zones. The tilt angle of the moving guide ring 601 and the stationary guide ring 602 is 15°-30°. This angle can prevent the flow rate of the flushing coolant from being too fast, which would increase energy consumption, and also prevent the flow rate from being too slow, which would result in insufficient flushing.

[0026] Please see Figures 1-2 The gap between the moving guide ring 601 and the stationary guide ring 602 is set to a vertical gap of 5-10mm. If the gap is too small, it will increase the flow resistance of the flushing coolant; if the gap is too large, it will affect the circulation of the flushing coolant. Setting the vertical gap between the moving guide ring 601 and the stationary guide ring 602 to 5-10mm can ensure the circulation of the flushing coolant.

[0027] Please see Figure 1 There are two stationary ring seats 4, and a cavity 12 is provided between the two stationary ring seats 4. A compensating spring 13 is provided in the cavity 12. The two ends of the compensating spring 13 are respectively connected to the two stationary ring seats 4. The two stationary rings 3 are respectively set on the corresponding stationary ring seats 4. The compensating spring 13 can continuously compensate for the gap changes caused by end face wear, ensuring that the end faces of the moving ring 2 and the stationary ring 3 are always in tight contact.

[0028] Please see Figures 1-2 A fixed seat 7 is fitted around the outer side of the two stationary ring seats 4. The stationary ring seats 4 and the fixed seat 7 are slidably connected. The fixed seat 7 is provided with a liquid inlet 8 and a liquid outlet 9. Both the liquid inlet 8 and the liquid outlet 9 are connected to the sealing cavity 5 through the cavity 12. The liquid inlet 8 is used to introduce flushing coolant into the sealing cavity 5, and the liquid outlet 9 is used to allow the flushing coolant to flow out.

[0029] In one embodiment, please refer to Figure 1 A first sealing element 10 is provided at the connection between the stationary ring seat 4 and the fixed seat 7. In this embodiment, the first sealing element 10 is sleeved on the stationary ring seat 4, and the outer end face of the first sealing element 10 is in close contact with the fixed seat 7. The first sealing element 10 can be an O-ring, which realizes dynamic sealing between the stationary ring seat 4 and the fixed seat 7 to prevent leakage of flushing coolant.

[0030] In one embodiment, please refer to Figures 1-2 The surfaces of the sealing cavity 5, cavity 12, and compensating spring 13 are all coated with a corrosion-resistant coating. This corrosion-resistant coating can be a metal-based coating (nickel-based alloy coating, copper-based alloy coating, etc.), which can be prepared using thermal spraying and electroplating processes; it can also be a ceramic-based coating (alumina coating, zirconium oxide coating, etc.), which can be prepared using physical vapor deposition or thermal spraying processes; or it can be a polymer-based coating (polytetrafluoroethylene coating, polyimide coating, fluororubber coating, etc.), which can be prepared using brushing, spraying, or dip coating processes. This corrosion-resistant coating reduces the corrosion of the sealing cavity 5, cavity 12, and compensating spring 13 by the flushing coolant, extending their service life.

[0031] In one embodiment, please refer to Figure 1 and Figures 3-4 The stationary ring seat 4 is also equipped with a barrier assembly 11, which includes two barrier sleeves 1101. One end of the barrier sleeve 1101 is set on the corresponding stationary ring seat 4. The barrier sleeve 1101 covers the outer side of the rotating ring 2 and the stationary ring 3. The inner side of the barrier sleeve 1101 is provided with a barrier ring 1102, which is sleeved on the outer side of the rotating shaft 1. The inner side of the barrier ring 1102 is provided with a thread 1103, and the thread 1103 is spaced slightly from the rotating shaft 1. When the rotating shaft 1 rotates, the thread 1103, which is in close contact with the rotating shaft 1, will reverse the liquid that is trying to leak outward and "pump" it back into the equipment, reducing the risk of liquid leakage inside the equipment.

[0032] In one embodiment, please refer to Figure 1 and Figures 3-4The gap between the end of thread 1103 and shaft 1 is 0.2-1mm. Setting the gap between the end of thread 1103 and shaft 1 to 0.2-1mm ensures that the end of thread 1103 does not contact shaft 1, while also allowing thread 1103 to generate a large "pumping" force.

[0033] In one embodiment, please refer to Figure 3 A second seal 14 is provided at the connection between the rotating ring 2 and the rotating shaft 1. The second seal 14 can be an O-ring to ensure a static seal between the rotating ring 2 and the rotating shaft 1, prevent liquid in the equipment from leaking into the sealing cavity 5 through the rotating ring 2, and allow the rotating ring 2 to rotate with the rotating shaft 1.

[0034] The following combination Figures 1-4 The working process of an internal flushing double-end mechanical seal according to this application is described as follows: In use, flushing coolant is introduced into the sealed cavity 5 through the inlet 8, and then the rotating shaft 1 is driven to rotate. When the rotating shaft 1 rotates, the moving guide ring 601 fixed on the rotating shaft 1 will drive the flushing coolant in the sealed cavity 5 to rotate together. When the rotating flushing coolant encounters the stationary guide ring 602, its flow is guided. Under the combined action of the moving guide ring 601 and the stationary guide ring 602, the flushing coolant in the sealed cavity 5 is forced to form a strong vortex and directional flow, ensuring that the flushing coolant can be directly delivered to the vicinity of the two friction end faces, so that the high-speed flowing liquid flushes the friction end faces, carries away the tiny wear particles generated by the end face friction, and carries away the large amount of heat generated by the end face friction, realizing the circulation flushing and cooling of the flushing coolant inside the sealed cavity 5.

[0035] In summary, this invention provides an internally flushed double-end-face mechanical seal. By incorporating a flow-guiding assembly, with a moving and a stationary flow-guiding ring working in conjunction, when the shaft rotates, the moving flow-guiding ring fixed to the shaft drives the flushing coolant within the sealing cavity to rotate as well. When the rotating coolant encounters the stationary flow-guiding ring, its flow is guided. Under the combined action of the moving and stationary flow-guiding rings, the flushing coolant within the sealing cavity is forced into a strong vortex and directional flow, ensuring that the flushing coolant can be directly delivered to the vicinity of the two friction end faces. The high-speed flowing liquid flushes the friction end faces, carrying away the tiny wear particles generated by the friction, preventing their accumulation on the end faces and causing scratches. The high-speed flowing liquid also carries away a large amount of heat generated by the friction, achieving efficient cooling of the end faces. As long as the shaft rotates, the flow-guiding assembly drives the flushing coolant to circulate and cool within the sealing cavity.

[0036] This invention integrates flushing and cooling functions within the mechanical seal, reducing complex external piping and fittings, resulting in a simple and compact structure. The flushing power is directly derived from the rotation of the main shaft, eliminating the need for an external power source, thus achieving energy efficiency. The flushing flow directly acts on the heated and worn friction surfaces, providing excellent cleaning and heat dissipation, high efficiency, and high practicality. It is particularly suitable for handling high-temperature, easily vaporized, or particulate-containing media. This invention can be widely applied in the field of mechanical seal technology.

[0037] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. An internal flushing double-end-face mechanical seal, comprising a rotating shaft (1), wherein two rotating rings (2) are provided on the rotating shaft (1), and a stationary ring seat (4) is sleeved on the outer side of the rotating shaft (1), wherein two stationary rings (3) are provided on the stationary ring seat (4), and the end faces of the rotating rings (2) and the stationary rings (3) are in contact with each other and cooperate for use, characterized in that, A sealing cavity (5) is formed between the moving ring (2), the stationary ring (3), the stationary ring seat (4) and the rotating shaft (1). A flow guiding assembly (6) is provided in the sealing cavity (5). The flow guiding assembly (6) includes a moving flow guiding ring (601) and a stationary flow guiding ring (602). A plurality of moving flow guiding rings (601) are circumferentially spaced on the outer wall of the rotating shaft (1), and a plurality of stationary flow guiding rings (602) are circumferentially spaced on the inner wall of the stationary ring seat (4). The moving flow guiding rings (601) and the stationary flow guiding rings (602) are spaced apart to form an interlaced flow channel.

2. The inner-cleaning double mechanical seal according to claim 1, wherein Both the moving guide ring (601) and the stationary guide ring (602) are inclined. The moving guide ring (601) is inclined toward one of the stationary rings (3), and the stationary guide ring (602) is inclined toward the other stationary ring (3).

3. The inner flushing double mechanical seal as set forth in claim 1 wherein, The dynamic guide ring (601) and the static guide ring (602) are spaced apart, with a vertical gap of 5-10 mm.

4. The inner flushing double mechanical seal of claim 1 wherein, There are two stationary ring seats (4), and a cavity (12) is provided between the two stationary ring seats (4). A compensating spring (13) is provided in the cavity (12). The two ends of the compensating spring (13) are respectively connected to the two stationary ring seats (4), and the two stationary rings (3) are respectively set on the corresponding stationary ring seats (4).

5. The internal flushing double-end mechanical seal as described in claim 4, characterized in that, A fixed seat (7) is fitted on the outer side of the two stationary ring seats (4). The stationary ring seats (4) and the fixed seat (7) are slidably connected. The fixed seat (7) is provided with an inlet (8) and an outlet (9). The inlet (8) and the outlet (9) are both connected to the sealing cavity (5) through the cavity (12).

6. The internal flushing double-end mechanical seal as described in claim 5, characterized in that, A first sealing element (10) is provided at the connection between the stationary ring seat (4) and the fixed seat (7).

7. The internal flushing double-end mechanical seal as described in claim 4, characterized in that, The surfaces of the sealed cavity (5), the cavity (12), and the compensating spring (13) are all provided with a corrosion-resistant coating.

8. The internal flushing double-end mechanical seal as described in claim 1, characterized in that, The stationary ring seat (4) is also provided with a blocking component (11). The blocking component (11) includes two blocking sleeves (1101). One end of the blocking sleeve (1101) is set on the corresponding stationary ring seat (4). The blocking sleeve (1101) covers the outside of the moving ring (2) and the stationary ring (3). The inner side of the blocking sleeve (1101) is provided with a blocking ring (1102). The blocking ring (1102) is sleeved on the outside of the rotating shaft (1). The inner side of the blocking ring (1102) is provided with a thread (1103). The thread (1103) is spaced apart from the rotating shaft (1).

9. The inner flushing double mechanical seal of claim 8 wherein, The gap between the end of the thread (1103) and the shaft (1) is 0.2-1mm.

10. The inner flushing double mechanical seal of claim 1 wherein, A second seal (14) is provided at the connection between the moving ring (2) and the rotating shaft (1).

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