Double-end-face mechanical sealing structure for reciprocating pump

Abstract

The invention belongs to the technical field of sealing elements, and particularly relates to a double-end-face mechanical sealing structure for a reciprocating pump, which comprises a pump body, one side of the pump body is provided with a connecting pipe I and a connecting pipe II, one end of the pump body is slidably connected with a piston rod, one end of the piston rod is fixedly connected with a piston, and the piston is slidably connected with the inner wall of the pump body; the device further comprises an automatic lubricating assembly. The automatic lubricating assembly comprises a plurality of oil outlets fixedly penetrating through the pump body, the oil outlets jointly and fixedly communicate with a storage shell, one side of the storage shell fixedly communicates with a pressure shell, a sliding rod is slidably connected to the middle of the upper end of the pressure shell, a pressing plate is fixedly connected to the lower end of the sliding rod, and the pressing plate is slidably connected with the inner wall of the pressure shell. By means of the automatic lubricating assembly, when the piston works for a period of time, lubricating oil can be smeared in the circumferential direction of the piston, so that abrasion between the piston and the inner wall of the pump body is reduced, and the service life of the whole structure is prolonged.

Description

Technical Field

[0001] This invention belongs to the field of sealing technology, specifically a double-end mechanical seal structure for reciprocating pumps. Background Technology

[0002] The double-end mechanical seal structure for reciprocating pumps is designed to meet the dynamic sealing requirements between the piston rod or plunger and the pump body of a reciprocating pump. It employs two sets (i.e., double-end faces) of axially arranged sealing end faces (dynamic ring and stationary ring), and introduces a pressurized isolation fluid system between the two seals to achieve an integrated shaft seal device with zero leakage of high-risk media under reciprocating motion.

[0003] Patent CN222415194U discloses a follower-type sealing device for a reciprocating oil drilling pump, including a piston and an annular plate. The annular plate is tightly fitted to the end face of the piston and is fixed to the piston surface by bolts. A scraper ring is connected and fixed to the side of the annular plate by a connecting rod, and the scraper ring is parallel to the surface of the annular plate. Three annular grooves are formed around the outer ring of the piston, and metal rings are clamped in the grooves. Multiple through holes are evenly formed on the piston surface between the annular grooves, and the through holes communicate with the interior of the piston. This patent achieves good lubrication by fixing a scraper ring to the end face of the piston, with the outer ring of the scraper ring close to the inner surface of the cylinder. During operation, oil adhering to the inside of the cylinder is first scraped off by the scraper ring, and then the piston containing the metal rings passes through. Furthermore, because lubricating oil can act on the side of each metal ring through the through holes, good lubrication can be achieved, reducing wear and ensuring service life.

[0004] However, the above technical solutions still have the following shortcomings in practical applications:

[0005] The piston needs to move back and forth within the pump body to deliver liquid. However, during this movement, the piston rubs against the inner wall of the pump body. This prolonged friction can cause wear on both the piston and the pump body, affecting the seal and overall performance. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art and solve at least one of the technical problems mentioned in the background art, the present invention proposes a double-end mechanical seal structure for reciprocating pumps.

[0007] The technical solution adopted by the present invention to solve its technical problem is: a double-end mechanical seal structure for a reciprocating pump, including a pump body, a connecting pipe one and a connecting pipe two are provided on one side of the pump body, a piston rod is slidably connected to one end of the pump body, a piston is fixedly connected to one end of the piston rod, and the piston is slidably connected to the inner wall of the pump body.

[0008] It also includes automatic lubrication components;

[0009] The automatic lubrication assembly includes multiple oil outlets that are fixedly connected to the pump body. The multiple oil outlets are all fixedly connected to a storage shell. A pressure shell is fixedly connected to one side of the storage shell. A slide rod is slidably connected to the middle of the upper end of the pressure shell. A pressure plate is fixedly connected to the lower end of the slide rod. The pressure plate is slidably connected to the inner wall of the pressure shell.

[0010] Preferably, a sealing ring is fixedly connected to one side of the outer wall of the pump body, and the sealing ring is sleeved on one side of the piston rod and slidably connected to it.

[0011] Preferably, a hinge block is fixedly connected to one end of the piston rod, a connecting rod is rotatably mounted on one side of the hinge block, a support plate is fixedly connected to one side of the outer wall of the pump body, a turntable is rotatably mounted on one end of the support plate via a rotating shaft, and one end of the connecting rod is rotatably mounted on the turntable.

[0012] Preferably, a motor is fixedly connected to one end of the support plate, and the output end of the motor is fixedly connected to one end of the rotating shaft.

[0013] Preferably, a rotating shaft is rotatably provided on one side of the inner wall of the oil outlet, and a baffle is fixedly connected to the rotating shaft.

[0014] Preferably, a gear is fixedly sleeved on one end of the rotating shaft, a gear ring is rotatably provided on one side of the outer wall of the storage shell, the gear meshes with the tooth blocks of the inner ring of the gear ring, a fixing plate is fixedly connected to one side of the outer wall of the storage shell, a second motor is fixedly connected to one side of the fixing plate, and the output end of the second motor is fixedly connected to one end of the rotating shaft.

[0015] Preferably, a fixing block is fixedly connected to the upper end of the slide rod, and a spring is sleeved on one side of the slide rod. One end of the spring is fixedly connected to the fixing block, and the other end is fixedly connected to one side of the outer wall of the pressure shell.

[0016] Preferably, an oil inlet is provided on one side of the pressure shell, and a valve is provided on the oil inlet.

[0017] Preferably, it also includes an anti-clogging filter component;

[0018] The anti-clogging filter assembly includes a filter screen fixedly connected to one side of the inner wall of the oil outlet, a telescopic plate slidably connected to the inner cavity of the baffle, and a brush provided at the end of the telescopic plate.

[0019] Preferably, one end of the telescopic plate is fixedly connected to a second spring, and the other end of the second spring is fixedly connected to one side of the inner wall of the telescopic plate.

[0020] The beneficial effects of this invention are as follows:

[0021] 1. The reciprocating pump double-end mechanical seal structure of the present invention utilizes an automatic lubrication component. After the piston has been working for a period of time, lubricating oil will be applied along the circumference of the piston, thereby reducing the wear between the piston and the inner wall of the pump body and improving the service life of the entire structure.

[0022] 2. The reciprocating pump double-end mechanical seal structure of the present invention utilizes an anti-clogging filter assembly. When the lubricating oil is discharged through the oil outlet, impurities in the lubricating oil are filtered by the filter screen, thereby preventing impurities from adhering to the piston surface along with the lubricating oil, which would exacerbate wear between the piston and the pump body, and further ensuring the service life of the entire structure. Furthermore, when the baffle blocks the lubricating oil, the end of the telescopic plate is pressed against the inner wall of the oil outlet. Each time the shaft rotates, the telescopic plate inside the baffle cavity loses its obstruction from the inner wall of the oil outlet and extends from the inside of the baffle under the action of the second spring. The brush then abuts against the surface of the filter screen, using its bristles to sweep away impurities on the filter screen, causing the impurities to move to one side. This ensures that a portion of the filter screen is always uncovered, thus guaranteeing the continuous passage of subsequent lubricating oil. Attached Figure Description

[0023] The invention will now be further described with reference to the accompanying drawings.

[0024] Figure 1 This is a schematic diagram of the complete three-dimensional structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the complete three-dimensional structure of the present invention from another perspective;

[0026] Figure 3 This is a schematic diagram of a partial cross-sectional three-dimensional structure of the pump body;

[0027] Figure 4 yes Figure 3 Enlarged view of a portion of point A in the middle;

[0028] Figure 5 This is a schematic diagram of a partial cross-sectional three-dimensional structure of the storage shell;

[0029] Figure 6 yes Figure 5 Enlarged view of a section at point B in the middle;

[0030] Figure 7 This is a schematic diagram of the planar structure showing the connection between the baffle and the telescopic plate.

[0031] In the diagram: 1. Pump body; 2. Support plate; 3. Motor 1; 4. Turntable; 5. Connecting rod; 6. Storage shell; 7. Connecting pipe 1; 8. Pressure shell; 9. Oil inlet; 10. Slide rod; 11. Spring 1; 12. Piston; 13. Piston rod; 14. Oil outlet; 15. Baffle; 16. Filter screen; 17. Brush; 18. Pressure plate; 19. Telescopic plate; 20. Spring 2; 21. Shaft 1; 22. Motor 2; 23. Gear; 24. Gear ring; 25. Fixing plate; 26. Hinge block; 27. Fixing block; 28. Connecting pipe 2; 29. ​​Sealing ring; 30. Shaft 2. Detailed Implementation

[0032] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Please refer to Figures 1-7 The present invention provides a technical solution: a double-end mechanical seal structure for a reciprocating pump, including a pump body 1, a connecting pipe 7 and a connecting pipe 28 on one side of the pump body 1, a piston rod 13 slidably connected to one end of the pump body 1, a piston 12 fixedly connected to one end of the piston rod 13, and the piston 12 slidably connected to the inner wall of the pump body 1.

[0034] It also includes automatic lubrication components;

[0035] The automatic lubrication assembly includes multiple oil outlets 14 that are fixedly connected to the pump body 1. The multiple oil outlets 14 are fixedly connected to a storage shell 6. A pressure shell 8 is fixedly connected to one side of the storage shell 6. A slide rod 10 is slidably connected to the middle of the upper end of the pressure shell 8. A pressure plate 18 is fixedly connected to the lower end of the slide rod 10. The pressure plate 18 is slidably connected to the inner wall of the pressure shell 8.

[0036] In this embodiment, as Figures 1-6 As shown, a sealing ring 29 is fixedly connected to one side of the outer wall of the pump body 1. The sealing ring 29 is sleeved on one side of the piston rod 13 and slidably connected to it.

[0037] A hinge block 26 is fixedly connected to one end of the piston rod 13. A connecting rod 5 is rotatably mounted on one side of the hinge block 26. A support plate 2 is fixedly connected to one side of the outer wall of the pump body 1. A turntable 4 is rotatably mounted on one end of the support plate 2 via a rotating shaft 30. One end of the connecting rod 5 is rotatably mounted on the turntable 4.

[0038] One end of the support plate 2 is fixedly connected to a motor 3, and the output end of the motor 3 is fixedly connected to one end of the rotating shaft 30.

[0039] A rotating shaft 21 is rotatably mounted on one side of the inner wall of the oil outlet 14, and a baffle 15 is fixedly connected to the rotating shaft 21.

[0040] A gear 23 is fixedly sleeved on one end of the rotating shaft 21. A gear ring 24 is rotatably arranged on one side of the outer wall of the storage shell 6. The gear 23 meshes with the tooth blocks of the inner ring of the gear ring 24. A fixing plate 25 is fixedly connected to one side of the outer wall of the storage shell 6. A motor 22 is fixedly connected to one side of the fixing plate 25. The output end of the motor 22 is fixedly connected to one end of the rotating shaft 21.

[0041] A fixing block 27 is fixedly connected to the upper end of the slide rod 10. A spring 11 is sleeved on one side of the slide rod 10. One end of the spring 11 is fixedly connected to the fixing block 27, and the other end is fixedly connected to one side of the outer wall of the pressure shell 8.

[0042] An oil inlet 9 is provided on one side of the pressure shell 8, and a valve is provided on the oil inlet 9.

[0043] Specifically, in the prior art, the piston 12 needs to reciprocate within the pump body 1 to achieve liquid delivery. However, during the movement, the piston 12 will rub against the inner wall of the pump body 1. This prolonged friction will cause wear between the piston 12 and the pump body 1, thus affecting the sealing and performance.

[0044] Therefore, in order to solve the above problems, the working principle of this embodiment is as follows:

[0045] First, hold the fixing block 27 and pull the slide rod 10 upwards to make the pressure plate 18 slide inside the pressure shell 8 until the pressure plate 18 is higher than the oil inlet 9. Then, inject a certain amount of lubricating oil into the pressure shell 8 and the storage shell 6 through the oil inlet 9. Then, release the fixing block 27, and the slide rod 10 will return to its original position under the action of the spring 11, and the pressure plate 18 will squeeze the lubricating oil located in the pressure shell 8.

[0046] Connecting pipe 7 and pipe 28 to external equipment, and driving turntable 4 to rotate via motor 3, will cause connecting rod 5 to rotate. This will cause hinge block 26 and piston rod 13 to reciprocate, causing piston 12 to move back and forth on the inner wall of pump body 1, thus realizing the delivery of liquid.

[0047] After piston 12 has worked for a period of time, it will stop at a fixed position inside the pump body 1, with oil outlet 14 aligned with the edge of piston 12. At this time, motor 22 drives one of the rotating shafts 21 to rotate. Under the transmission of gear ring 24 and multiple gears 23, multiple rotating shafts 21 and multiple baffles 15 will rotate simultaneously. A gap will appear between the baffles 15 and the oil outlet 14. As the pressure plate 18 continuously squeezes the lubricating oil under the action of spring 11, the lubricating oil will be discharged from multiple oil outlets 14 simultaneously due to the compression, thus lubricating piston 12 around its circumference. Then the baffles 15 will return to their original position. The above operation is repeated. After piston 12 has worked for a period of time, lubricating oil will be spread along the circumference of piston 12, thereby reducing wear between piston 12 and the inner wall of pump body 1 and improving the service life of the entire structure.

[0048] In this embodiment, as Figure 4 and Figure 7 As shown, it also includes an anti-clogging filter component;

[0049] The anti-clogging filter assembly includes a filter screen 16 fixedly connected to one side of the inner wall of the oil outlet 14, a telescopic plate 19 slidably connected to the inner cavity of the baffle 15, and a brush 17 provided at the end of the telescopic plate 19.

[0050] One end of the telescopic plate 19 is fixedly connected to a spring 20, and the other end of the spring 20 is fixedly connected to one side of the inner wall of the telescopic plate 19.

[0051] Specifically, in the above embodiments, although automatic lubrication of the piston 12 can be achieved, since the lubricating oil is stored in the storage shell 6 and the pressure shell 8 for a long time, when the inner walls of the storage shell 6 and the pressure shell 8 shed debris due to corrosion or other factors, the debris will mix with the lubricating oil. When the lubricating oil is sprayed on the surface of the piston 12, the debris will also adhere to the surface of the piston 12 along with the lubricating oil, thereby aggravating the wear between the piston 12 and the inner wall of the pump body 1 and affecting the service life of the entire structure.

[0052] Therefore, in order to solve the above problems, the working principle of this embodiment is as follows:

[0053] Since a filter screen 16 is provided on one side of the inner wall of the oil outlet 14, when the lubricating oil is discharged through the oil outlet 14, the filter screen 16 will filter the impurities in the lubricating oil, thereby avoiding the situation where impurities and lubricating oil adhere together to the surface of the piston 12, which would aggravate the wear between the piston 12 and the pump body 1, and further ensure the service life of the entire structure.

[0054] However, as the filter screen 16 continuously filters impurities from the lubricating oil, these impurities accumulate on its surface. When they reach a certain quantity, they clog the filter screen 16, affecting the passage of subsequent lubricating oil. To address this issue, when the baffle 15 blocks the lubricating oil, the end of the telescopic plate 19 is pressed against the inner wall of the oil outlet 14. Whenever the rotating shaft 21 rotates, the telescopic plate 19 inside the baffle 15 loses its obstruction from the inner wall of the oil outlet 14 and extends out from the inside of the baffle 15 under the action of the spring 20. The brush 17 then comes into contact with the surface of the filter screen 16, using its bristles to clean the impurities on the filter screen 16, causing them to move to one side. This ensures that a portion of the filter screen 16 remains uncovered, guaranteeing the continuous passage of subsequent lubricating oil.

[0055] Working principle: First, hold the fixing block 27 and pull the slide rod 10 upward to make the pressure plate 18 slide in the inner cavity of the pressure shell 8 until the pressure plate 18 is higher than the oil inlet 9. Then, inject a certain amount of lubricating oil into the pressure shell 8 and the storage shell 6 through the oil inlet 9. Then, release the fixing block 27, and the slide rod 10 will be reset under the action of the spring 11, and the pressure plate 18 will squeeze the lubricating oil in the pressure shell 8.

[0056] Connecting pipe 7 and pipe 28 to external equipment, and driving turntable 4 to rotate via motor 3, will cause connecting rod 5 to rotate. This will cause hinge block 26 and piston rod 13 to reciprocate, causing piston 12 to move back and forth on the inner wall of pump body 1, thus realizing the delivery of liquid.

[0057] After piston 12 has worked for a period of time, it will stop at a fixed position inside the pump body 1, with oil outlet 14 aligned with the edge of piston 12. At this time, motor 22 drives one of the rotating shafts 21 to rotate. Under the transmission of gear ring 24 and multiple gears 23, multiple rotating shafts 21 and multiple baffles 15 will rotate simultaneously. A gap will appear between the baffles 15 and the oil outlet 14. As the pressure plate 18 continuously squeezes the lubricating oil under the action of spring 11, the lubricating oil will be discharged from multiple oil outlets 14 simultaneously due to the compression, thus lubricating piston 12 around its circumference. Then the baffles 15 will return to their original position. The above operation is repeated. After piston 12 has worked for a period of time, lubricating oil will be spread along the circumference of piston 12, thereby reducing wear between piston 12 and the inner wall of pump body 1 and improving the service life of the entire structure.

[0058] Since a filter screen 16 is provided on one side of the inner wall of the oil outlet 14, when the lubricating oil is discharged through the oil outlet 14, the filter screen 16 will filter the impurities in the lubricating oil, thereby avoiding the situation where impurities and lubricating oil adhere together to the surface of the piston 12, which would aggravate the wear between the piston 12 and the pump body 1, and further ensure the service life of the entire structure.

[0059] However, as the filter screen 16 continuously filters impurities from the lubricating oil, these impurities accumulate on its surface. When they reach a certain quantity, they clog the filter screen 16, affecting the passage of subsequent lubricating oil. To address this issue, when the baffle 15 blocks the lubricating oil, the end of the telescopic plate 19 is pressed against the inner wall of the oil outlet 14. Whenever the rotating shaft 21 rotates, the telescopic plate 19 inside the baffle 15 loses its obstruction from the inner wall of the oil outlet 14 and extends out from the inside of the baffle 15 under the action of the spring 20. The brush 17 then comes into contact with the surface of the filter screen 16, using its bristles to clean the impurities on the filter screen 16, causing them to move to one side. This ensures that a portion of the filter screen 16 remains uncovered, guaranteeing the continuous passage of subsequent lubricating oil.

[0060] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A double-end mechanical seal structure for a reciprocating pump, comprising a pump body (1), characterized in that: The pump body (1) is provided with a connecting pipe 1 (7) and a connecting pipe 2 (28) on one side. A piston rod (13) is slidably connected to one end of the pump body (1). A piston (12) is fixedly connected to one end of the piston rod (13). The piston (12) is slidably connected to the inner wall of the pump body (1). It also includes automatic lubrication components; The automatic lubrication assembly includes multiple oil outlets (14) that are fixedly connected to the pump body (1). The multiple oil outlets (14) are fixedly connected to a storage shell (6). A pressure shell (8) is fixedly connected to one side of the storage shell (6). A slide rod (10) is slidably connected to the middle of the upper end of the pressure shell (8). A pressure plate (18) is fixedly connected to the lower end of the slide rod (10). The pressure plate (18) is slidably connected to the inner wall of the pressure shell (8).

2. The double-end mechanical seal structure for a reciprocating pump according to claim 1, characterized in that: A sealing ring (29) is fixedly connected to one side of the outer wall of the pump body (1). The sealing ring (29) is sleeved on one side of the piston rod (13) and slidably connected to it.

3. The double-end mechanical seal structure for a reciprocating pump according to claim 1, characterized in that: One end of the piston rod (13) is fixedly connected to a hinge block (26), and a connecting rod (5) is rotatably arranged on one side of the hinge block (26). A support plate (2) is fixedly connected to one side of the outer wall of the pump body (1). A turntable (4) is rotatably arranged on one end of the support plate (2) through a rotating shaft (30), and one end of the connecting rod (5) is rotatably arranged on the turntable (4).

4. The double-end mechanical seal structure for a reciprocating pump according to claim 1, characterized in that: One end of the support plate (2) is fixedly connected to a motor (3), and the output end of the motor (3) is fixedly connected to one end of the rotating shaft (30).

5. The double-end mechanical seal structure for a reciprocating pump according to claim 1, characterized in that: A rotating shaft (21) is rotatably provided on one side of the inner wall of the oil outlet (14), and a baffle (15) is fixedly connected to the rotating shaft (21).

6. The double-end mechanical seal structure for a reciprocating pump according to claim 5, characterized in that: A gear (23) is fixedly sleeved on one end of the rotating shaft (21). A gear ring (24) is rotatably provided on one side of the outer wall of the storage shell (6). The gear (23) meshes with the teeth of the inner ring of the gear ring (24). A fixing plate (25) is fixedly connected to one side of the outer wall of the storage shell (6). A motor (22) is fixedly connected to one side of the fixing plate (25). The output end of the motor (22) is fixedly connected to one end of the rotating shaft (21).

7. The double-end mechanical seal structure for a reciprocating pump according to claim 1, characterized in that: A fixing block (27) is fixedly connected to the upper end of the slide rod (10). A spring (11) is sleeved on one side of the slide rod (10). One end of the spring (11) is fixedly connected to the fixing block (27), and the other end is fixedly connected to one side of the outer wall of the pressure shell (8).

8. The double-end mechanical seal structure for a reciprocating pump according to claim 1, characterized in that: An oil inlet (9) is provided on one side of the pressure shell (8), and a valve is provided on the oil inlet (9).

9. The double-end mechanical seal structure for a reciprocating pump according to claim 1, characterized in that: It also includes anti-clogging filter components; The anti-clogging filter assembly includes a filter screen (16) fixedly connected to one side of the inner wall of the oil outlet (14), a telescopic plate (19) slidably connected to the inner cavity of the baffle (15), and a brush (17) provided at the end of the telescopic plate (19).

10. A double-end mechanical seal structure for a reciprocating pump according to claim 9, characterized in that: One end of the telescopic plate (19) is fixedly connected to a spring (20), and the other end of the spring (20) is fixedly connected to one side of the inner wall of the telescopic plate (19).

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