Sealing system for plunger at fluid end of fracturing pump

Abstract

The invention relates to the technical field of fracturing pump fluid end sealing, and discloses a fracturing pump fluid end plunger sealing system which comprises a pump body, a plurality of plungers are fixedly connected to the power end of the pump body, stuffing boxes are arranged on the peripheries of the plungers, and a fixing disc is fixedly connected to the left side of each stuffing box. A fracturing pump fluid end is arranged on the sides, away from the stuffing box, of the multiple fixing discs, a first supporting ring is fixedly connected to the interior of the stuffing box, a second supporting ring is slidably connected to the interior of the stuffing box, and two sealing rings are arranged between the first supporting ring and the second supporting ring. By arranging the sand scraping assembly, when the plunger moves in a reciprocating mode, sand carried by the plunger can be scraped, and it is avoided that abrasion is aggravated due to the fact that the sand enters the attaching face of the sealing ring and the plunger; and when external particle impurities are attached to the surface of the plunger, the impurities can be scraped off through the gland, and the scraped impurities can fall into the collecting assembly, so that follow-up cleaning is facilitated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fracturing pump fluid end sealing, in particular to a fracturing pump fluid end plunger sealing system. BACKGROUND

[0002] In the field of oil and gas exploitation, fracturing pump is the core power equipment of hydraulic fracturing operation, and its core function is to pressurize the fracturing fluid to high pressure and continuously deliver it to the downhole formation, so as to open up the channel for oil and gas flow by high-pressure fracturing fluid, and finally improve the production of oil and gas well; and the plunger, as the key moving part of the fluid end of the fracturing pump, is the core of realizing the cycle of liquid suction and discharge: under the drive of the power end, the plunger makes high-frequency reciprocating motion along the fluid end cylinder body, and when the plunger retreats, negative pressure is formed in the cylinder body to suck the fracturing fluid, and when the plunger advances, it squeezes the fracturing fluid in the cylinder body to make it discharge at high pressure; therefore, the sealing performance between the plunger and the fluid end directly determines the pressure maintaining ability and operation efficiency of the fracturing pump, and is the key link to ensure the stable development of fracturing operation.

[0003] The current mainstream fracturing pump fluid end plunger sealing system sets a cylindrical packing box at the matching part of the fluid end and the plunger, a plurality of sealing rings (mostly made of rubber or polytetrafluoroethylene) are installed in the packing box in sequence along the axial direction, and some systems will additionally set metal support rings on both sides of the sealing ring to prevent deformation of the sealing ring; the outside of the packing box is connected and fixed with the fluid end flange through a fixed disc, and a gland is arranged at the end of the packing box, the position of the gland is adjusted by bolts, the sealing ring is squeezed to tightly fit the outer periphery of the plunger, and initial sealing is formed.

[0004] However, the part of the plunger close to the fluid end directly contacts the sand-containing fracturing fluid, and the surface is easy to attach sand particles; and the part of the plunger exposed to the air will also adsorb impurities such as dust and particles in the environment, and there is a lack of effective cleaning design in the prior art, these impurities attached to the surface of the plunger will enter the inside of the packing box with the reciprocating motion of the plunger, and will produce severe friction with the sealing ring and the surface of the plunger, which not only scratches the outer surface of the plunger, but also accelerates the wear and deformation of the sealing ring, resulting in rapid increase of the sealing gap and causing fracturing fluid leakage, thereby affecting the service life of the sealing system and the safety of the fracturing pump operation. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides a fracturing pump fluid end plunger sealing system, which solves the problem of poor sealing effect of the fracturing pump fluid end plunger in the prior art.

[0006] In order to achieve the above object, the present application is realized by the following technical scheme: A fracturing pump fluid end plunger sealing system, comprising a pump body, the power end of the pump body is fixedly connected with a plurality of plungers, the outer periphery of the plurality of plungers is provided with a stuffing box, the left side of the stuffing box is fixedly connected with a fixed disc, the side away from the stuffing box of the plurality of fixed discs is provided with a fracturing pump fluid end, the inside of the stuffing box is fixedly connected with a support ring one, the inside of the stuffing box is slidably connected with a support ring two, two sealing rings are arranged between the support ring one and the support ring two, the right side of the inside of the stuffing box is provided with a gland; the left side of the inside of the stuffing box is provided with a sand scraping assembly, the sand scraping assembly is used for scraping the sand particles on the surface of the plunger, the top of the stuffing box is provided with a heat dissipation assembly, the heat dissipation assembly is used to discharge the heat inside the stuffing box, the outside of the gland is provided with an adjusting assembly, the adjusting assembly is used to adjust the pre-tightening force of the sealing ring.

[0007] Preferably, the sand scraping assembly comprises a shell, the outer periphery of the shell is fixedly connected to the inner wall of the stuffing box, a plurality of spring one ends are fixedly connected to the inside of the shell, the other ends of the plurality of springs are fixedly connected with a sand scraping plate, the outer periphery of the plunger is slidably connected to the outside of the sand scraping plate, the bottom of the stuffing box is provided with a collecting assembly, the collecting assembly is used to collect the external particle impurities attached to the outer surface of the plunger.

[0008] Preferably, the collecting assembly comprises an outer shell, the top of the outer shell is fixedly connected to the bottom of the stuffing box, a collecting frame is slidably connected to the inside of the outer shell, two slide rails are fixedly connected to the inner bottom wall of the outer shell, and the bottom of the collecting frame is slidably connected to the top of the slide rails.

[0009] Preferably, two magnets one are fixedly connected to the inside of the slide rails, two magnets two are fixedly connected to the inside of the collecting frame, and the magnets one and the magnets two are magnetically attracted.

[0010] Preferably, the heat dissipation assembly comprises a plurality of heat dissipation fins, the heat dissipation fins are mounted on the outside of the stuffing box, one of the plungers is fixedly connected with a fixed ring, one end of a connecting rod is fixedly connected to the outside of the fixed ring, the other end of the connecting rod is fixedly connected with a sliding rod, one end of the sliding rod away from the connecting rod is fixedly connected with a piston, the outer periphery of the piston is provided with a cylinder, a one-way valve two is mounted on the outer wall of the cylinder, one end of the one-way valve two away from the cylinder is fixedly connected with a suction head, one-way valves one are mounted on the top and bottom of the cylinder, two ends of the one-way valves one away from the cylinder are fixedly connected with blowing heads, and the bottom of the cylinder is fixedly connected with two support frames.

[0011] Preferably, the outer periphery of the piston is slidably connected to the inner wall of the cylinder, and the outer periphery of the sliding rod is slidably connected to the inside of the cylinder.

[0012] Preferably, the adjusting assembly comprises a spring two, one end of the spring two is fixedly connected to the right side of the support ring two, the other end of the spring two is fixedly connected to the left side of the gland, the inner side of the gland is threadedly connected with two bolts two, the inner wall of the stuffing box is fixedly connected with two fixed blocks, and the outer periphery of the bolt two is threadedly connected to the inner side of the fixed block.

[0013] Preferably, the inner side of the fixed disc is threadedly connected with a plurality of bolts one, the outer periphery of the bolt one is threadedly connected to the inside of the fluid end of the fracturing pump, and the fixed disc is fixed to the outer wall of the fluid end of the fracturing pump through the bolt one.

[0014] Preferably, the outer side of the fixed disc is provided with a sealing gasket, and the sealing gasket is arranged between the fixed disc and the fluid end of the fracturing pump.

[0015] Preferably, a dust screen is arranged on the inner wall of the air suction head, and the dust screen is used for intercepting dust and other particulate impurities in the air.

[0016] The present application provides a kind of fracturing pump fluid end plunger sealing system.It has the following beneficial effects: 1、The present application sets up the sand scraping assembly composed of shell, spring one and sand scraping plate, and the collection assembly containing collection frame, sliding rail and magnetic attraction structure, when the plunger reciprocates, spring one pushes sand scraping plate to adhere to the surface of plunger, which can remove the sand carried by plunger, avoiding the increase of wear caused by sand entering the contact surface of sealing ring;And when the particulate impurities outside adhere to the surface of plunger, the impurities can be scraped off by gland, and the scraped impurities will fall into the collection frame, and the magnetic attraction structure can fix the collection frame to prevent displacement, which is convenient for subsequent cleaning, and the surface of plunger can be cleaned to reduce the damage of impurities to sealing ring, thereby increasing the service life of sealing element.

[0017] 2、The present application uses the reciprocating motion of plunger itself as power source, and drives the fixed ring and connecting rod to make the sliding rod and piston reciprocate in the cylinder, cooperates with one-way valve one and one-way valve two to realize air circulation: when the piston moves, air is sucked from outside, and then the air is blown to the heat dissipation fins at the top of the stuffing box through the air blowing head;This process does not require additional power device, and can continuously remove the heat generated by the friction between the sealing ring in the stuffing box and the plunger, avoiding the accumulation of heat to cause the high temperature aging of sealing ring and the decrease of elasticity, so that the sealing element works at appropriate temperature, thereby improving the reliability of sealing system.

[0018] 3、The bolt two is matched with the gland and the fixed block through the thread, can push the gland to transmit the pressure through the spring two to the support ring two, flexibly adjusts the pre-tightening force of the sealing ring, ensures the initial sealing effect, when the sealing ring is worn due to long-term friction, the spring two can automatically release the elastic potential energy, pushes the support ring two to continuously extrude the sealing ring, compensates the wear amount, avoids the leakage caused by the wear of the sealing element, and the sealing state can be maintained for a long time without frequent replacement of the sealing element. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a perspective view of the present application; Figure 2 It is a schematic view of the hydraulic end of the fracturing pump; Figure 3 It is a schematic view of the fixed disc; Figure 4 It is a sectional view of the packing box; Figure 5 It is Figure 4 It is an enlarged view of A in the middle; Figure 6 It is a sectional view of the shell; Figure 7 It is a schematic view of the shell; Figure 8 It is Figure 7 It is an enlarged view of B in the middle; Figure 9 It is a schematic view of the cylinder; Figure 10 It is a sectional view of the cylinder.

[0020] 1, pump body;2, fracturing pump hydraulic end;3, packing box;4, fixed disc;5, bolt one;6, plunger;7, heat dissipation fin;8, sealing gasket;9, shell;10, sand scraping plate;11, spring one;12, gland;13, spring two;14, sealing ring;15, support ring one;16, support ring two;17, bolt two;18, fixed block;19, shell;20, collection frame;21, slide rail;22, magnet one;23, magnet two;24, fixed ring;25, connecting rod;26, sliding rod;27, cylinder;28, blowing head;29, suction head;30, one-way valve one;31, support frame;32, piston;33, one-way valve two;34, dust screen. DETAILED DESCRIPTION

[0021] With reference to the drawings of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0022] Please refer to the drawings of the present application Figure 1 - the drawings of the present application Figure 4 The embodiment of the present application provides a kind of fracturing pump fluid end plunger sealing system, including pump body 1, the power end of pump body 1 is fixedly connected with multiple plunger 6, multiple plunger 6 periphery is provided with packing gland 3, the left side of packing gland 3 is fixedly connected with fixed disc 4, multiple fixed disc 4 is provided with fracturing pump fluid end 2 away from packing gland 3 side, packing gland 3 inside is fixedly connected with support ring one 15, packing gland 3 inside is slidably connected with support ring two 16, two sealing rings 14 are arranged between support ring one 15 and support ring two 16, packing gland 3 inside left side is provided with gland 12;Packing gland 3 inside left side is provided with sand scraping assembly, sand scraping assembly is used to scrape the sand particle on the surface of plunger 6, packing gland 3 top is provided with heat dissipation assembly, heat dissipation assembly is used to discharge the heat in packing gland 3, the outside of gland 12 is provided with adjusting assembly, adjusting assembly is used to adjust the pre-tightening force of sealing ring 14.

[0023] Specifically, when plunger 6 is driven to reciprocate by the power end of pump body 1, packing gland 3 provides sealing space for plunger 6, support ring one 15 and support ring two 16 cooperate to hold sealing ring 14, so that sealing ring 14 is tightly attached to the periphery of plunger 6, thereby forming a basic seal, fixed disc 4 stably connects packing gland 3 with fracturing pump fluid end 2, to ensure that the sealing system and fluid end work cooperatively, since the fracturing fluid contains sand particles, the sand particles adhering to the surface of plunger 6 are scraped off by the sand scraping assembly, to avoid damage to the sealing element caused by residual sand particles;When plunger 6 is reciprocating, a large amount of heat is generated, which can be quickly dissipated by the heat dissipation assembly, to avoid the sealing performance of the sealing element being reduced due to overheating in packing gland 3;The pre-tightening force of sealing ring 14 can be adjusted by the adjusting assembly, so that the sealing performance of sealing ring 14 is in good condition.

[0024] Please refer to the drawings of the present application Figure 4 - the drawings of the present application Figure 6 The sand scraping assembly includes a housing 9, which is fixedly connected to the inner wall of the packing gland 3. A plurality of springs 11 are fixedly connected to the inside of the housing 9. The other ends of the springs 11 are fixedly connected to a sand scraping plate 10. The periphery of the plunger 6 is slidably connected to the outside of the sand scraping plate 10. The bottom of the packing gland 3 is provided with a collecting assembly for collecting external particulate impurities adhering to the outer surface of the plunger 6.

[0025] Specific, the plunger 6 near the part of the fracturing pump fluid end 2 contact the sand particles attached to the back surface, when the plunger 6 through the shell 9, spring 11 always to the sand plate 10 to apply radial force, the sand plate 10 inner circle attached to the plunger 6 surface, with the plunger 6 reciprocating motion and scraping sand, through the spring force variation can automatically adapt to the plunger 6 surface, ensure long-term stable sand scraping effect, avoid sand into the sealing ring 14 area and cause wear.

[0026] Please refer to the attached Figure 2 , attached Figure 7 and attached Figure 8 , the collection assembly includes a shell 19, shell 19 top fixedly connected in the stuffing box 3 bottom, shell 19 inside slidingly connected with the collection frame 20, shell 19 inner bottom wall fixedly connected with two slide rails 21, collection frame 20 bottom slidingly connected in the slide rail 21 top.

[0027] Specific, because the plunger 6 near the part of the exposed in the outside air, will lead to its exposed part attached to some air particles, when the plunger 6 exposed part of the air particles attached to the scraping, will fall under the action of gravity to the shell 19 inside the collection frame 20, so as to prevent the scattering of impurities in the outside; collection frame 20 through the slide rail 21 and shell 19 sliding fit, both ensure the stability of the collection frame 20 collection of impurities, but also facilitate the operator to pull out the collection frame 20 cleaning, ensure the continuity of the collection of impurities.

[0028] Please refer to the attached Figure 7 and attached Figure 8 , two slide rails 21 inside are fixedly connected with the magnet 22, the collection frame 20 inside fixedly connected with two magnets 23, magnet 22 and magnet 23 between the magnetic attraction.

[0029] Specific, the magnet 22 upward side of the N pole, the magnet 23 downward side of the S pole, through the principle of opposite sex, can make the magnet 22 and magnet 23 can attract each other, so you can through the magnet 22 and magnet 23 of the magnetic attraction of the collection frame 20 stable adsorbed in the slide rail 21, avoid the vibration caused by the movement of the plunger 6 and lead to the collection frame 20 displacement or fall off, ensure the impurities accurately fall into the collection frame 20; at the same time, the operator only needs to slightly pull the collection frame 20, so as to overcome the magnetic force to complete the disassembly.

[0030] Please refer to the attached Figure 2 , attached Figure 9 and attached Figure 10The heat dissipation assembly comprises a plurality of heat dissipation fins 7 mounted outside the stuffing box 3. One of the plungers 6 is fixedly connected with a fixing ring 24 outside which is fixedly connected with one end of a connecting rod 25, and the other end of the connecting rod 25 is fixedly connected with a sliding rod 26, and one end of the sliding rod 26 away from the connecting rod 25 is fixedly connected with a piston 32, and the piston 32 is provided with a cylinder 27 outside the periphery of which is mounted a one-way valve 33 away from the cylinder 27 and fixedly connected with a suction head 29, and the top and bottom of the cylinder 27 are both mounted with a one-way valve 30 away from the cylinder 27 and fixedly connected with a blowing head 28, and the bottom of the cylinder 27 is fixedly connected with two support frames 31.

[0031] Specifically, when the plunger 6 reciprocates inside the stuffing box 3, the heat generated by friction with the sealing ring 14 is transferred to the heat dissipation fins 7 by heat conduction, thereby increasing the temperature of the area around the fins 7; and when the plunger 6 reciprocates, the connecting rod 25 can be driven to move by the fixing ring 24, and then the sliding rod 26 and the piston 32 are synchronously moved by the connecting rod 25, and the piston 32 reciprocates in the cylinder 27, and the one-way valve 30 and the one-way valve 33 form a directional airflow; when the piston 32 moves towards the connecting rod 25, the volume of the closed cavity in front of the piston 32 increases, thereby reducing the pressure inside the cylinder 27, thereby forming a negative pressure, so that external air is sucked in through the suction head 29 and then enters the inside of the cylinder 27 through the one-way valve 33; when the piston 32 moves away from the connecting rod 25, the air inside the cylinder 27 is compressed, thereby increasing the pressure inside the cylinder 27, and at this time, the internal air flows to the surface of the heat dissipation fins 7 through the one-way valve 30 and the blowing head 28, thereby quickly taking away the heat; and the support frames 31 provide stable support for the cylinder 27 to ensure that the heat dissipation assembly continues to work.

[0032] Please refer to the accompanying drawings Figure 10 The piston 32 is slidably connected to the inner wall of the cylinder 27, and the sliding rod 26 is slidably connected to the inside of the cylinder 27.

[0033] Specifically, the sliding cooperation between the piston 32 and the inner wall of the cylinder 27 and the sliding connection between the sliding rod 26 and the cylinder 27 ensure that the piston 32 can smoothly reciprocate and that an effective closed cavity is formed inside the cylinder 27.

[0034] Please refer to the accompanying drawings Figure 4 and the accompanying drawings Figure 5The adjusting assembly comprises a spring 13, one end of the spring 13 is fixedly connected to the right side of the support ring 16, the other end of the spring 13 is fixedly connected to the left side of the gland 12, two bolts 17 are threadedly connected to the inner side of the gland 12, two fixed blocks 18 are fixedly connected to the inner wall of the packing gland 3, and the outer periphery of the bolt 17 is threadedly connected to the inner side of the fixed block 18.

[0035] Specifically, when the bolt 17 is rotated, the bolt 17 drives the gland 12 to move axially along the packing gland 3 in cooperation with the fixed block 18, at this time, the gland 12 transmits the pressure to the support ring 16 through the spring 13, so that the support ring 16 extrudes the sealing ring 14, and the pre-tightening force is flexibly adjusted; the elasticity of the spring 13 can automatically compensate for the wear of the sealing ring 14, so as to continuously push the support ring 16 to extrude the sealing ring 14, thereby maintaining stable sealing and reducing the need for frequent maintenance.

[0036] Please refer to the accompanying drawings Figure 2 and the accompanying drawings Figure 3 A plurality of bolts 5 are threadedly connected to the inner side of the fixed disc 4, the outer periphery of the bolt 5 is threadedly connected to the inside of the fracturing pump fluid end 2, and the fixed disc 4 is fixed to the outer wall of the fracturing pump fluid end 2 through the bolt 5.

[0037] Specifically, the plurality of bolts 5 are evenly distributed on the outer side of the fixed disc 4, and the fixed disc 4 and the fracturing pump fluid end 2 are firmly connected together through thread cooperation, so as to ensure that the packing gland 3 and the internal components are stably connected with the fracturing pump fluid end 2, avoid the increase of the sealing gap due to loose connection when the plunger 6 moves, and the uniform stress connection mode is also convenient for later disassembly and maintenance.

[0038] Please refer to the accompanying drawings Figure 2 and the accompanying drawings Figure 3 A sealing gasket 8 is installed on the outer side of the fixed disc 4, and the sealing gasket 8 is installed between the fixed disc 4 and the fracturing pump fluid end 2.

[0039] Specifically, the sealing gasket 8 fills the small gap between the fixed disc 4 and the fracturing pump fluid end 2, enhances the sealing of the connection between the two, prevents the fracturing fluid from leaking from the connection gap or foreign matter from entering, and thus enhances the sealing effect of the device.

[0040] Please refer to the accompanying drawings Figure 9 A dust screen 34 is installed on the inner wall of the air suction head 29, and the dust screen 34 is used to intercept dust and other particulate impurities in the air.

[0041] Specifically, the dust screen 34 can filter dust and other particulate impurities in the air when the air suction head 29 sucks in the air, so as to avoid the influence of these particulate impurities on the normal operation of the heat dissipation assembly.

[0042] Working principle: Because the plunger 6 is in reciprocating motion, its end close to the fluid end 2 of the fracturing pump is directly in contact with the fracturing fluid, which causes some sand particles to adhere to the surface of the plunger 6. When these sand particles pass through the shell 9, they come into direct contact with the sand scraping plate 10 inside the shell 9, thereby scraping off the sand particles adhering to the surface of the plunger 6. The scraped-off sand particles flow back into the fluid end 2 of the fracturing pump along with the fracturing fluid. A spring 11 is arranged between the sand scraping plate 10 and the shell 9, which dynamically adjusts the gap between the sand scraping plate 10 and the plunger 6, ensuring that the sand scraping plate 10 always maintains a close-fitting state with the plunger 6. Because the part of the plunger 6 close to the power end of the fracturing pump is exposed to air, some particulate impurities in the air will also adhere to the surface of the plunger 6. Therefore, the gland 12 is used to scrape off the particulate impurities adhering to the surface of the plunger 6. The scraped-off particulate impurities fall into the collection frame 20 inside the shell 19 due to their own gravity, thereby completing the collection of particulate impurities.

[0043] When the plunger 6 is in reciprocating motion, heat is generated inside the packing box 3 due to friction. These heat is absorbed by the heat dissipation fins 7 on the surface of the packing box 3, which causes the temperature around the fins to rise. Therefore, a fixed ring 24 is installed on the outer periphery of one of the plungers 6, and the fixed ring 24 is connected with a sliding rod 26 through a connecting rod 25, so that the plunger 6 can drive the sliding rod 26 to move, thereby driving the piston 32 to slide inside the cylinder 27. When the piston 32 moves towards the connecting rod 25, the volume of the sealed cavity in front of the piston 32 increases, thereby forming a negative pressure. Therefore, external air enters the cylinder 27 through the one-way valve 33. When the piston 32 moves towards the fluid end of the fracturing pump 2, the air inside the cylinder 27 is compressed, thereby increasing the pressure inside the cylinder 27. Therefore, the gas rushes towards the heat dissipation fins 7 through the one-way valve 1, thereby removing the heat on the surface of the heat dissipation fins 7.

[0044] When it is necessary to adjust the position of the gland 12, the staff only needs to operate the tool to rotate the bolt 17, and then cooperate with the fixed block 18 inside the packing box 3 to move the gland 12 inside the packing box 3. The gland 12 transmits pressure to the support ring 16 through the spring 13, so that the support ring 16 extrudes the sealing ring 14, until the sealing ring 14 forms a reliable seal with the plunger 6. When the sealing ring 14 is worn due to long-term friction, the spring 13 can automatically release the elastic potential energy to push the support ring 16 to continuously extrude the sealing ring 14, thereby compensating for the wear amount and maintaining stable sealing effect.

Claims

1. A fracturing pump fluid end piston seal system, characterized by, Include: Pump body (1), the power end of the pump body (1) is fixedly connected with a plurality of plungers (6), a plurality of the plunger (6) is provided with a packing box (3) on the periphery, the left side of the packing box (3) is fixedly connected with a fixed disc (4), a plurality of the fixed disc (4) is provided with a fracturing pump fluid end (2) away from the packing box (3) side, the packing box (3) is fixedly connected with a support ring one (15) inside, the packing box (3) is slidably connected with a support ring two (16) inside, two sealing rings (14) are arranged between the support ring one (15) and the support ring two (16), the packing box (3) is provided with a gland (12) on the right side inside; The left side of the packing box (3) is provided with a sand scraping assembly, the sand scraping assembly is used for scraping the sand particles on the surface of the plunger (6), the top of the packing box (3) is provided with a heat dissipation assembly, the heat dissipation assembly is used to discharge the heat inside the packing box (3), the outer side of the gland (12) is provided with an adjusting assembly, the adjusting assembly is used to adjust the pre-tightening force of the sealing ring (14).

2. A fracturing pump fluid end piston seal system as claimed in claim 1, wherein, The sand scraping assembly comprises a housing (9), the housing (9) is fixedly connected with a plurality of spring one (11) one end inside, a plurality of the spring one (11) the other end is fixedly connected with a sand scraping plate (10), the plunger (6) is slidably connected outside the sand scraping plate (10), the bottom of the packing box (3) is provided with a collecting assembly, the collecting assembly is used to collect the external particle impurities attached to the outer surface of the plunger (6).

3. A fracturing pump fluid end piston seal system as defined in claim 2 wherein, The collecting assembly comprises an outer shell (19), the outer shell (19) is fixedly connected at the bottom of the packing box (3), the outer shell (19) is slidably connected with a collecting frame (20) inside, the inner bottom wall of the outer shell (19) is fixedly connected with two slide rails (21), the collecting frame (20) is slidably connected at the top of the slide rail (21) bottom.

4. A fracturing pump fluid end piston seal system as defined in claim 3 wherein, Two the slide rail (21) inside is fixedly connected with a magnet one (22), the collecting frame (20) is fixedly connected with two magnet two (23) inside, the magnet one (22) and the magnet two (23) are magnetically attracted between.

5. A fracturing pump fluid end piston seal system as claimed in claim 1 wherein, The heat dissipation assembly includes a plurality of heat dissipation fins (7) mounted outside the filler (3), wherein one of the plunger (6) is fixedly connected with a fixed ring (24), the fixed ring (24) is fixedly connected with one end of the connecting rod (25) outside, the other end of the connecting rod (25) is fixedly connected with the sliding rod (26), the sliding rod (26) is fixedly connected with the piston (32) away from one end of the connecting rod (25), the piston (32) is provided with a cylinder (27) outside, the outer wall of the cylinder (27) is provided with a one-way valve (33), the one-way valve (33) is fixedly connected with the suction head (29) away from one end of the cylinder (27), the top and bottom of the cylinder (27) are provided with a one-way valve (30), the two one-way valves (30) are fixedly connected with the blowing head (28) away from one end of the cylinder (27), and the bottom of the cylinder (27) is fixedly connected with two support frames (31).

6. A fracturing pump fluid end piston seal system as claimed in claim 5 wherein, The piston (32) is slidably connected to the inner wall of the cylinder (27), and the sliding rod (26) is slidably connected to the inner wall of the cylinder (27).

7. A fracturing pump fluid end piston seal system as claimed in claim 1 wherein, The adjusting assembly includes a spring (13), one end of the spring (13) is fixedly connected to the right side of the support ring (16), the other end of the spring (13) is fixedly connected to the left side of the gland (12), the inner side of the gland (12) is threadedly connected with two bolts (17), the inner wall of the filler (3) is fixedly connected with two fixed blocks (18), and the outer periphery of the bolt (17) is threadedly connected to the inner side of the fixed block (18).

8. A fracturing pump fluid end piston seal system as defined in claim 1, wherein, The inner side of the fixed disc (4) is threadedly connected with a plurality of bolts (5), the outer periphery of the bolt (5) is threadedly connected to the inside of the fracturing pump fluid end (2), and the fixed disc (4) is fixed to the outer wall of the fracturing pump fluid end (2) through the bolt (5).

9. A fracturing pump fluid end piston seal system as defined in claim 1 wherein, The outer side of the fixed disc (4) is provided with a sealing gasket (8), and the sealing gasket (8) is arranged between the fixed disc (4) and the fracturing pump fluid end (2).

10. A fracturing pump fluid end piston seal system as defined in claim 5, wherein, The inner wall of the suction head (29) is provided with a dust screen (34), and the dust screen (34) is used for intercepting dust and other particulate impurities in the air.

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