Rotary sealing structure for power end of fracturing pump and fracturing pump

Abstract

The invention relates to the technical field of pump assembly sealing structures, in particular to a rotary sealing structure for the power end of a fracturing pump and the fracturing pump, and the rotary sealing structure comprises a rotary joint mounting seat, a sealing ring mounting seat, a lip-shaped sealing ring and a connecting pressing plate; the rotating joint mounting seat and the crankshaft rotate synchronously, and the rotating joint mounting seat is provided with a spiral structure opposite to the rotating direction of the crankshaft; the lip-shaped sealing ring is arranged between the sealing ring mounting seat and the rotary joint mounting seat in a sealing manner; the connecting pressing plate is connected with the sealing ring installation base, a sealing boss is formed on the connecting pressing plate, and the spiral structure of the rotating connector installation base is arranged in the sealing boss in a sealed mode. According to the rotary sealing structure for the power end of the fracturing pump and the fracturing pump, the design of a double-sealing mode of the spiral sealing structure and the lip-shaped sealing ring structure is adopted, the sealing reliability is improved, on one hand, dirt is prevented from entering the box body, and on the other hand, internal lubricating oil is prevented from leaking.

Description

Technical Field

[0001] The present invention relates to the technical field of pump component sealing structures, and in particular to a rotary sealing structure for a power end of a fracturing pump and a fracturing pump. Background Art

[0002] Since the fracturing pump power was applied, its working environment varies greatly and is extremely harsh, such as: some places are rainy and humid; some places are dry and dusty. If external rainwater enters the lubrication system of the fracturing pump power end, it will harm the lubricating oil and affect the lubrication effect of the lubricated parts; at the same time, if external sand and dust enter the box, it will aggravate the wear of gears, bearings, and bushings, thus affecting the life of the entire fracturing pump. For this reason, the sealing structure and components of the fracturing pump power end have attracted more and more attention from relevant engineers and designers.

[0003] The rotary seal structure of the power end of the fracturing pump in the prior art includes: a rotary seal mechanism is required on the left and right sides of the crankshaft of the power end of each fracturing pump, which is symmetrical on the left and right sides. Each rotary seal mechanism includes: 1 rotary joint mounting seat, 4 bolts, 4 washers, 1 lip seal ring, 1 seal ring mounting seat, 1 sealing gasket, 1 gear cover and 1 connecting pressure plate, etc.

[0004] However, the above-mentioned rotary sealing mechanism has the following technical problems: 1. Only a single skeleton lip seal is used for sealing, resulting in poor sealing reliability; 2. After the skeleton lip seal ring is in close contact with the rotary joint for a long time, the rotary joint is worn, the contact shaft diameter becomes smaller and the contact condition becomes worse. After replacing the new seal ring, it still cannot produce a good sealing effect; 3. The existing threaded connection method has the problem of oil seepage and oil leakage in the threaded hole. Summary of the invention

[0005] The present invention provides a rotary seal structure for a power end of a fracturing pump and a fracturing pump, which are used to solve the defect of poor sealing reliability existing in the background technology.

[0006] The present invention provides a rotary sealing structure for a power end of a fracturing pump, which is respectively installed at both ends of a crankshaft of the power end of the fracturing pump, and comprises: A rotary joint mounting seat, the rotary joint mounting seat is arranged at one end of the crankshaft and performs synchronous rotational motion with the crankshaft, and a spiral structure is arranged on the outer side of the rotary joint mounting seat in a direction opposite to the rotation direction of the crankshaft; A sealing ring mounting seat, wherein the sealing ring mounting seat is arranged at the power end of the fracturing pump, and the rotary joint mounting seat is penetrated through the sealing ring mounting seat; A lip seal ring, wherein the lip seal ring is sealingly arranged between the seal ring mounting seat and the rotary joint mounting seat; A connecting pressure plate is connected to the sealing ring mounting seat, a sealing boss is formed on the connecting pressure plate, and the spiral structure of the rotary joint mounting seat is sealed in the sealing boss.

[0007] The rotary seal structure for the power end of a fracturing pump provided by the present invention further comprises: a seal ring transposition ring; wherein,

[0008] A mounting position is formed on the inner side of one end of the sealing ring mounting seat, and the mounting position is located on the outer side of the rotary joint mounting seat. The sealing ring transposition ring and the lip sealing ring are arranged in sequence along the axial direction in the mounting position.

[0009] The rotary sealing structure for the power end of a fracturing pump provided by the present invention further comprises: a sealing ring pressing plate, wherein the sealing ring pressing plate is pressed against the lip sealing ring by a first fastener.

[0010] According to the rotary sealing structure for the power end of a fracturing pump provided by the present invention, the sealing ring transposition ring and the lip sealing ring can be interchanged in the axial direction of the installation position, and when the sealing ring transposition ring and the lip sealing ring exchange positions, a new lip sealing ring is replaced.

[0011] According to the rotary sealing structure for the power end of a fracturing pump provided by the present invention, a first oil return chamber is formed at the other end of the sealing ring mounting seat, and the first oil return chamber is located between the mounting position and the spiral structure; The connecting pressing plate is formed with an oil unloading hole, and the oil unloading hole is communicated with the first oil return chamber.

[0012] The rotary sealing structure for the power end of a fracturing pump provided in the present invention further includes: a gear cover, on which is formed a first through hole for the second fastener to pass through, and the sealing ring mounting seat, the gear cover and the connecting pressure plate are fastened and connected in sequence by the second fastener.

[0013] The rotary sealing structure for the power end of a fracturing pump provided by the present invention further comprises: a first gasket, the first gasket being disposed between the second fastener and the sealing ring mounting seat; A sealing gasket is arranged between the sealing ring mounting seat and the gear cover, and a second through hole for the second fastener to pass through is formed on the sealing gasket.

[0014] According to the rotary sealing structure for the power end of a fracturing pump provided by the present invention, the sealing gasket is connected to the gear cover to form a second oil return chamber, and the first oil return chamber is connected to the oil unloading hole through the second oil return chamber.

[0015] The rotary sealing structure for the power end of a fracturing pump provided by the present invention further includes: an O-ring, a mounting groove is provided on the outer side of the rotary joint mounting seat and at one end close to the crankshaft, and the O-ring is arranged in the mounting groove.

[0016] The present invention further provides a fracturing pump, comprising: the rotary sealing structure for the power end of the fracturing pump of the present invention.

[0017] The present invention provides a rotary sealing structure for the power end of a fracturing pump, which is respectively installed at the two ends of the crankshaft of the power end of the fracturing pump, and includes: a rotary joint mounting seat, a sealing ring mounting seat, a lip sealing ring and a connecting pressure plate; the rotary joint mounting seat is arranged at one end of the crankshaft and performs synchronous rotational motion with the crankshaft, and the outer side of the rotary joint mounting seat is provided with a spiral structure in the opposite direction of the crankshaft rotation; the sealing ring mounting seat is arranged at the power end of the fracturing pump, and the rotary joint mounting seat is penetrated through the sealing ring mounting seat; the lip sealing ring is sealed between the sealing ring mounting seat and the rotary joint mounting seat; the connecting pressure plate is connected to the sealing ring mounting seat, a sealing boss is formed on the connecting pressure plate, and the spiral structure of the rotary joint mounting seat is sealed in the sealing boss. The present invention provides a rotary sealing structure for the power end of a fracturing pump, which adopts a dual sealing form design of a spiral sealing structure and a lip sealing ring structure, which improves the sealing reliability, prevents dirt from entering the interior of the box on the one hand, and prevents internal lubricating oil from leaking on the other hand.

[0018] Furthermore, the present invention provides a fracturing pump, which includes: the rotary sealing structure for the power end of the fracturing pump in the above embodiment of the present invention, and therefore has the same advantages as above. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a structural schematic diagram of a rotary seal structure for a power end of a fracturing pump provided in one embodiment of the present invention in a first state.

[0021] Figure 2It is a structural schematic diagram of a rotary seal structure for a power end of a fracturing pump provided in one embodiment of the present invention in a second state.

[0022] Figure 3 It is a cross-sectional view of a rotary seal structure for a power end of a fracturing pump provided in one embodiment of the present invention in a first state.

[0023] Figure 4 It is a schematic diagram of the structure of a sealing ring pressure plate provided in one embodiment of the present invention.

[0024] Figure 5 It is a schematic diagram of the structure of a gear cover provided in one embodiment of the present invention.

[0025] Figure 6 It is a schematic structural diagram of a rotary joint mounting base provided in one embodiment of the present invention.

[0026] Figure 7 It is a schematic diagram of the structure of a connecting pressure plate provided in one embodiment of the present invention.

[0027] Figure 8 It is a schematic structural diagram of a sealing ring mounting seat provided in one embodiment of the present invention.

[0028] Fig. 9 It is a schematic diagram of the structure of an O-ring provided in one embodiment of the present invention.

[0029] Reference numerals: 1. Rotary joint mounting seat; 101. Spiral structure; 102. Mounting groove; 2. First fastener; 3. Sealing ring pressure plate; 4. Lip seal ring; 5. Sealing ring transposition ring; 6. Second fastener; 7. First gasket; 8. Sealing ring mounting seat; 801. Mounting position; 802. First oil return chamber; 9. Sealing gasket; 10. Gear cover; 11. Connecting pressure plate; 111. Sealing boss; 112. Oil discharge hole; 12. Third fastener; 13. Second gasket; 14. Crankshaft; 15. O-ring. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0032] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0033] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0035] Combine the following Figure 1-Figure 9The present invention describes a rotary seal structure for a power end of a fracturing pump. The rotary seal structure for the power end of a fracturing pump is respectively installed at both ends of a crankshaft 14 of the power end of the fracturing pump, and comprises: a rotary joint mounting seat 1, a sealing ring mounting seat 8, a lip seal ring 4 and a connecting plate 11. The rotary seal structure for the power end of a fracturing pump in the following embodiments is described as a structure installed at one end of the crankshaft 14, and the rotary seal structures for the power end of a fracturing pump located at the left and right ends of the crankshaft 14 are symmetrically arranged.

[0036] Among them, the rotary joint mounting seat 1 is arranged at one end of the crankshaft 14 and makes synchronous rotation movement with the crankshaft 14, and the outer side of the rotary joint mounting seat 1 is provided with a spiral structure 101 which is opposite to the rotation direction of the crankshaft 14; the sealing ring mounting seat 8 is arranged at the power end of the fracturing pump, and the rotary joint mounting seat 1 is penetrated by the sealing ring mounting seat 8; the lip sealing ring 4 is sealingly arranged between the sealing ring mounting seat 8 and the rotary joint mounting seat 1; the connecting pressure plate 11 is connected to the sealing ring mounting seat 8, and a sealing boss 111 is formed on the connecting pressure plate 11, and the spiral structure 101 of the rotary joint mounting seat 1 is sealingly arranged in the sealing boss 111.

[0037] Specifically, the rotary joint mounting seat 1 is connected to the crankshaft 14 through a third fastener 12 and a second washer 13; optionally, the rotary joint mounting seat 1 is installed on the crankshaft 14 through four bolts and four washers, so that the rotary joint mounting seat 1 and the crankshaft 14 rotate together to perform a rotary motion.

[0038] like Figures 1 to 3 As shown, the sealing ring mounting seat 8 is installed on the outside of the power end of the fracturing pump, and has a through hole inside, on the one hand, for the rotary joint mounting seat 1 to pass through, and on the other hand, a lip sealing ring 4 and a sealing ring transposition ring 5 are accommodated between the through hole and the rotary joint mounting seat 1 (the sealing ring transposition ring 5 is specifically described in the following embodiments). The lip sealing ring 4 is arranged on the rotary joint mounting seat 1 and the sealing ring mounting seat 8, and the power end of the fracturing pump is sealed by the lip sealing ring 4, on the one hand, to prevent dirt from entering the interior of the box, and on the other hand, to prevent lubricating oil from leaking from the end of the rotary joint mounting seat 1.

[0039] The connecting plate 11 is located at the rear end of the sealing ring mounting seat 8. Figures 1 to 3In the structure shown, the connecting plate 11 is located on the right side of the sealing ring mounting seat 8. The present invention processes a spiral structure 101 on the outer side of the rotary joint mounting seat 1, and when the rotary joint mounting seat 1 is assembled, the spiral structure 101 is correspondingly sealed and installed in the sealing boss 111 on the connecting plate 11. Optionally, the spiral structure 101 is a spiral groove, and the rotation direction of the spiral groove is opposite to the rotation direction of the crankshaft 14. It should be understood that if the crankshaft 14 rotates clockwise, the spiral structure 101 of the rotary joint mounting seat 1 is a counterclockwise spiral structure 101; if the crankshaft 14 rotates counterclockwise, the spiral structure 101 of the rotary joint mounting seat 1 is a clockwise spiral structure 101.

[0040] When the crankshaft 14 drives the rotary joint mounting base 1 to rotate, the spiral groove rotates in the opposite direction, and the rotation of the spiral groove forms a tendency to transport the lubricating oil to the inside of the housing to prevent most of the lubricating oil from moving to the outside of the housing, thereby forming a mechanical spiral seal.

[0041] It can be seen that the rotary sealing structure for the power end of the fracturing pump provided by the present invention adopts a double sealing design of a spiral sealing structure and a lip seal ring 4 structure, which improves the sealing reliability, prevents dirt from entering the interior of the box on the one hand, and prevents internal lubricating oil from leaking on the other hand.

[0042] In one embodiment of the present invention, the rotary seal structure for the power end of the fracturing pump further includes: a seal ring transposition ring 5. A mounting position 801 is formed on the inner side of one end of the seal ring mounting seat 8, and the mounting position 801 is located on the outer side of the rotary joint mounting seat 1. The seal ring transposition ring 5 and the lip seal ring 4 are arranged in sequence in the axial direction in the mounting position 801. Figure 8 In the structure shown, a mounting position 801 is formed in the sealing ring mounting seat 8, and the mounting position 801 is preferably a mounting hole, the inner diameter of the mounting hole is larger than the outer diameter of the rotary joint mounting seat 1, and the sealing ring transposition ring 5 and the lip sealing ring 4 are sequentially installed axially between the mounting hole and the rotary joint mounting seat 1. Specifically, the inner side of the lip sealing ring 4 is attached to the outer side of the rotary joint mounting seat 1, and the outer side of the lip sealing ring 4 is attached to the inner side of the mounting hole to achieve its sealing function; the sealing ring transposition ring 5 is an annular structure, and its outer side is attached to the inner side of the mounting hole.

[0043] In one embodiment of the present invention, the rotary sealing structure for the power end of the fracturing pump further includes: a sealing ring pressing plate 3, which is pressed and arranged on the lip sealing ring 4 by the first fastener 2. It should be understood that if the sealing ring transposition ring 5 is installed, the sealing ring pressing plate 3 is pressed and arranged on the outside of the lip sealing ring 4 and the sealing ring transposition ring 5 by the first fastener 2. Preferably, a limiting groove is formed at the end of the installation position 801 away from the sealing ring pressing plate 3, that is, a limiting groove is formed on the inner side of the installation position 801, and the lip sealing ring 4 and the sealing ring transposition ring 5 are pressed on the limiting groove, and the lip sealing ring 4 and the sealing ring transposition ring 5 are limited between the limiting groove and the sealing ring pressing plate 3 by the sealing ring pressing plate 3. If the lip sealing ring 4 needs to be replaced and the positions of the lip sealing ring 4 and the sealing ring transposition ring 5 need to be exchanged, it is only necessary to remove the sealing ring pressing plate 3 for replacement and exchange.

[0044] In one of the embodiments of the present invention, the seal ring replacement ring 5 and the lip seal ring 4 are interchangeable in the axial direction of the mounting position 801, and when the seal ring replacement ring 5 and the lip seal ring 4 are exchanged, a new lip seal ring 4 is replaced. In this embodiment, since the lip seal ring 4 is in long-term contact with the rotary joint mounting seat 1 and there is relative movement, the lip seal ring 4 will cause the part of the rotary joint mounting seat 1 in contact with it to wear, and the shaft diameter becomes smaller and the smoothness becomes worse, thereby causing problems such as poor sealing effect and oil leakage. For this reason, a seal ring replacement ring 5 is designed, and its diameter and width are the same as the corresponding dimensions of the lip seal ring 4. When the lip seal ring 4 is installed for the first time, the seal ring replacement ring 5 is installed on the right side of the mounting position 801, and the lip seal ring 4 is installed on the left side of the mounting position 801. Its structure is as shown in FIG. Figure 1 When the rotary joint mounting seat 1 journal wear, the lip seal ring 4 and the seal ring transposition ring 5 mounting position 801 is interchanged, and replaced with a new lip seal ring 4 during the interchange process, its structure as shown Figure 2 The second state shown. The rotary joint mounting seat 1 at the position of the new lip seal 4 has not been worn, and its sealing effect is good. Through the above operation, the oil leakage problem caused by wear can be repaired without large-scale disassembly, shortening the maintenance time and saving the maintenance cost.

[0045] In one embodiment of the present invention, a first oil return chamber 802 is formed at the other end of the sealing ring mounting seat 8, and the first oil return chamber 802 is located between the mounting position 801 and the spiral structure 101; the connecting plate 11 is formed with an oil discharge hole 112, and the oil discharge hole 112 is connected to the first oil return chamber 802. Specifically, the first oil return chamber 802 is located on the inner side of the mounting position 801, mainly accommodating a small amount of leaked oil leaked through the spiral structure 101, and the leaked oil is discharged through the oil discharge hole 112. In this embodiment, the volume of the first oil return chamber 802 is increased to accommodate more leaked oil, and the leaked oil is returned to the interior of the box through the oil discharge hole 112 to avoid waste of lubricating oil.

[0046] In one embodiment of the present invention, the rotary seal structure for the power end of the fracturing pump further includes: a gear cover 10, a first through hole for the second fastener 6 to pass through is formed on the gear cover 10, and the sealing ring mounting seat 8, the gear cover 10 and the connecting plate 11 are sequentially fastened and connected by the second fastener 6. Preferably, the second fastener 6 can be a bolt fastener, and the sealing ring mounting seat 8, the gear cover 10 and the connecting plate 11 are sequentially installed from the outside to the inside, and the three are fastened and connected by the bolt fastener. The aperture of the first through hole on the gear cover 10 is larger than the outer diameter of the bolt fastener, and the first through hole has a positioning function. In order to facilitate the installation of the oil unloading hole 112 on the connecting pressure plate 11 directly below the rotary joint mounting seat 1 and prevent the lubricating oil from leaking from the bolt connection hole of the sealing ring mounting seat 8, a first through hole for the bolt to pass through is designed on the gear cover 10, and the diameter of the first through hole is larger than the diameter of the above-mentioned bolt, so as to facilitate the adjustment of the coaxiality of the sealing ring mounting seat 8 with the rotary joint mounting seat 1 during the installation process and the circumferential positioning of the oil unloading hole 112 of the connecting pressure plate 11.

[0047] In one embodiment of the present invention, the rotary sealing structure for the power end of the fracturing pump also includes: a first gasket 7 and a sealing pad 9. The first gasket 7 is arranged between the second fastener 6 and the sealing ring mounting seat 8; the sealing pad 9 is arranged between the sealing ring mounting seat 8 and the gear cover 10, and a second through hole for the second fastener 6 to pass through is formed on the sealing pad 9. Specifically, the sealing ring mounting seat 8 is connected to the connecting plate 11 by 4 bolts and 4 washers, and the gear cover 10 is sandwiched between the two. In order to prevent oil leakage from the joint surface formed between the sealing ring mounting seat 8 and the gear cover 10, a sealing pad 9 is provided between the sealing ring mounting seat 8 and the gear cover 10. The sealing pad 9 is also designed with a through hole for the bolt to pass through, which is used to seal the bolt connection position, which eliminates the problem that the sealing pad 9 in the mainstream structure on the market does not seal the bolt connection part of the sealing ring mounting seat 8, thereby forming a leakage point.

[0048] In one embodiment of the present invention, the sealing gasket 9 and the gear cover 10 are connected to form a second oil return chamber, and the first oil return chamber 802 is connected to the oil discharge hole 112 through the second oil return chamber. Specifically, the sealing gasket 9 and the gear cover 10 form a connected second oil return chamber, and a small amount of leaked oil leaked through the spiral structure 101 is discharged through the first oil return chamber 802, the second oil return chamber and the oil discharge hole 112 in sequence and flows back to the inside of the box.

[0049] In one embodiment of the present invention, the rotary sealing structure for the power end of the fracturing pump also includes: an O-ring 15, an installation groove 102 is provided on the outer side of the rotary joint mounting seat 1 and at one end close to the crankshaft 14, and the O-ring 15 is arranged in the installation groove 102, and the O-ring 15 is used to realize the sealed connection between the rotary joint mounting seat 1 and the crankshaft 14.

[0050] The present invention further provides a fracturing pump, which comprises: the rotary sealing structure for the power end of the fracturing pump in the above embodiment of the present invention.

[0051] The present invention provides a fracturing pump, which comprises: the rotary sealing structure for the power end of the fracturing pump in the above embodiment of the present invention, and therefore has the same advantages as above.

[0052] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, i.e., they may be located in one place, or they may be distributed over multiple units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment. Those of ordinary skill in the art may understand and implement the present invention without creative effort.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rotary seal structure for a power end of a fracturing pump, characterized in that: The crankshaft (14) is respectively mounted on both ends of the power end of the fracturing pump, and comprises: A rotary joint mounting seat (1), the rotary joint mounting seat (1) being arranged at one end of a crankshaft (14) and performing synchronous rotational motion with the crankshaft (14), and a spiral structure (101) rotating in a direction opposite to that of the crankshaft (14) being arranged on the outer side of the rotary joint mounting seat (1); A sealing ring mounting seat (8), the sealing ring mounting seat (8) being arranged at the power end of the fracturing pump, and the rotary joint mounting seat (1) being passed through the sealing ring mounting seat (8); A lip seal ring (4), the lip seal ring (4) being sealingly arranged between the seal ring mounting seat (8) and the rotary joint mounting seat (1); A connecting pressure plate (11), the connecting pressure plate (11) being connected to the sealing ring mounting seat (8), a sealing boss (111) being formed on the connecting pressure plate (11), and the spiral structure (101) of the rotary joint mounting seat (1) being sealingly disposed within the sealing boss (111).

2. The rotary seal structure for the power end of a fracturing pump according to claim 1, characterized in that: Also includes: Sealing ring transposition ring (5); wherein, A mounting position (801) is formed on the inner side of one end of the sealing ring mounting seat (8), the mounting position (801) being located on the outer side of the rotary joint mounting seat (1), and the sealing ring transposition ring (5) and the lip sealing ring (4) are arranged in sequence along the axial direction in the mounting position (801).

3. The rotary seal structure for the power end of a fracturing pump according to claim 1, characterized in that: Also includes: A sealing ring pressing plate (3), wherein the sealing ring pressing plate (3) is pressed against the lip sealing ring (4) via a first fastener (2).

4. The rotary seal structure for the power end of a fracturing pump according to claim 2, characterized in that: The sealing ring replacement ring (5) and the lip sealing ring (4) are interchangeable in the axial direction of the installation position (801), and when the sealing ring replacement ring (5) and the lip sealing ring (4) are exchanged, a new lip sealing ring (4) is replaced.

5. The rotary seal structure for the power end of a fracturing pump according to claim 2, characterized in that: A first oil return chamber (802) is formed at the other end of the sealing ring mounting seat (8), and the first oil return chamber (802) is located between the mounting position (801) and the spiral structure (101); The connecting pressing plate (11) is formed with an oil unloading hole (112), and the oil unloading hole (112) is communicated with the first oil return chamber (802).

6. The rotary seal structure for the power end of a fracturing pump according to claim 5, characterized in that: Also includes: A gear cover (10) is formed with a first through hole for a second fastener (6) to pass through, and the sealing ring mounting seat (8), the gear cover (10) and the connecting pressure plate (11) are fastened and connected in sequence via the second fastener (6).

7. The rotary seal structure for the power end of a fracturing pump according to claim 6, characterized in that: Also includes: a first gasket (7), the first gasket (7) being arranged between the second fastener (6) and the sealing ring mounting seat (8); A sealing gasket (9), the sealing gasket (9) being arranged between the sealing ring mounting seat (8) and the gear cover (10), and the sealing gasket (9) being formed with a second through hole for the second fastener (6) to pass through.

8. The rotary seal structure for the power end of a fracturing pump according to claim 7, characterized in that: The sealing gasket (9) and the gear cover (10) are connected to form a second oil return chamber, and the first oil return chamber (802) is connected to the oil discharge hole (112) through the second oil return chamber.

9. The rotary seal structure for the power end of a fracturing pump according to any one of claims 1 to 8, characterized in that: Also includes: An O-shaped sealing ring (15) is provided with a mounting groove (102) on the outer side of the rotary joint mounting seat (1) and at one end close to the crankshaft (14), and the O-shaped sealing ring (15) is arranged in the mounting groove (102).

10. A fracturing pump, characterized in that: include: A rotary seal structure for a power end of a fracturing pump as claimed in any one of claims 1 to 9.

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