阅读说明：本技术 柱塞泵动力端壳体 (Power end shell of plunger pump ) 是由 田志飞 崔文平 李朋 王继鑫 张树林 于 2021-10-19 设计创作，主要内容包括：本公开的实施例提供了一种柱塞泵动力端壳体,包括壳体本体,所述壳体本体包括：多个周边盖板,所述多个周边盖板首尾依次连接以限定在轴向上具有开口的筒结构；以及中间立板,所述中间立板沿径向设置在所述筒结构内,并且通过全边界全焊接与所述多个周边盖板接合。该动力端壳体可提升结构的可靠性、维护/保养的便利性和设计的轻量化,从而更好地满足当下及未来的油田开采、尤其是压裂作业的需求。(An embodiment of the present disclosure provides a plunger pump power end housing, including housing body, housing body includes: a plurality of peripheral cover plates connected end to end in series to define a cartridge structure having an opening in an axial direction; and a middle riser disposed radially within the tubular structure and joined to the plurality of peripheral cover plates by full-perimeter full welds. The power end shell can improve the reliability of the structure, the convenience of maintenance and light weight of design, thereby better meeting the requirements of current and future oil field exploitation, especially fracturing operation.)

1. A plunger pump power end housing comprising a housing body, the housing body comprising:

a plurality of peripheral cover plates connected end to end in series to define a cartridge structure having an opening in an axial direction; and

a middle riser disposed radially within the barrel structure and joined to the plurality of peripheral cover plates by full perimeter full welds.

2. The plunger pump power end housing of claim 1, wherein the plurality of perimeter cover plates comprise an upper arc cover plate, a rear support plate, a sloped baffle, a rear baffle, an oil pan, a front support plate, a front end plate, and a front cover plate connected end-to-end in series, wherein,

the front cover plate is provided with an upper observation window assembly, the front cover plate is in sealing joint with the upper observation window assembly through a sealing ring, and

and the rear supporting plate is provided with a rear observation window assembly, and the rear supporting plate is in sealing connection with the rear observation window assembly through a sealing ring.

3. The plunger pump power end housing of claim 2, further comprising first and second gearbox covers sealingly engaged with the housing body at the opening by a seal ring, the first and second gearbox covers projecting radially of the canister structure relative to the upper arc cover plate and the rear support plate.

4. The plunger pump power end housing of claim 3,

the sealing rings are fixed on the front cover plate and the rear supporting plate through threaded fixing holes which are of blind hole structures,

and/or the presence of a gas in the gas,

the seal ring is fixed on the first gearbox cover and the second gearbox cover through a thread fixing hole, and the thread fixing hole is of a blind hole structure.

5. The plunger pump power end housing of any of claims 2-4, wherein the upper viewing window assembly comprises an upper viewing window support plate and a plurality of upper viewing window covers disposed on the upper viewing window support plate independent of one another,

the upper viewing window support plate is raised relative to the front cover plate.

6. The plunger pump power end housing of any of claims 2-4, wherein the rear viewing window assembly includes a plurality of rear viewing window covers independent of each other.

7. The plunger pump power end housing according to any of claims 2-4, wherein an oil return is provided on the oil pan, and wherein the oil return has a dog-groove configuration.

8. The plunger pump power end housing of any one of claims 1-4, wherein the housing body is provided with a grease tube aperture configured to allow a grease tube to extend within an interior of the plunger pump power end housing.

9. The plunger pump power end housing of claim 3 or 4, wherein the front end plate and the intermediate riser are made of a steel material having a yield strength greater than 600MPa, and wherein

The first gearbox cover, the second gearbox cover, the upper observation window assembly, the rear observation window assembly and the sealing ring are made of aluminum alloy materials.

10. The plunger pump power end housing of claim 3, wherein the first gearbox cover and the second gearbox cover each have a rotating oil seal and one of the first gearbox cover and the second gearbox cover also has an input shaft oil seal,

the rotary oil seal seat and the input shaft oil seal seat are respectively fixed on the corresponding gear box cover through fixing threaded holes arranged on the boss structures, and the fixing threaded holes are of blind hole structures.

Technical Field

At least one embodiment of the present disclosure is directed to a plunger pump power end housing.

Background

Plunger pumps are commonly used in oil field mining for cementing, acidizing, fracturing operations, often assembled on the overall equipment in the form of a truck or sled.

Plunger pumps generally comprise two main parts, a power end and a fluid end. It is known in the art to connect the drive flange of a plunger pump power end assembly to an external power source such as a diesel or electric motor power source. In the process of oil field operation, under the drive of an external power source, a gear pair of the power end assembly rotates to drive the connecting rod crosshead structure to reciprocate. The reciprocating motion of the plunger realizes the change of the working volume of the valve box and the opening and closing of the valve assembly, thereby realizing the pumping of high-pressure liquid.

The power end shell is used as a key component of the plunger pump and is used for carrying all parts of the power end and bearing all loads brought by all parts of the power end in working. Along with the development of the working conditions of oil field exploitation at home and abroad towards the trend of high pressure and large displacement, higher and higher requirements are provided for the aspects of the reliability of the structure of the power end shell of the plunger pump, the convenience of maintenance, the light weight of design and the like.

Disclosure of Invention

At least one embodiment of the present disclosure provides a plunger pump power end housing that can promote reliability of power end housing structure, ease of maintenance and lightweight design to better meet the needs of current and future oil field exploitation, particularly fracturing operations.

In order to achieve the above object, the embodiments of the present disclosure adopt the following technical solutions.

An embodiment of the present disclosure provides a plunger pump power end housing, including housing body, housing body includes:

a plurality of peripheral cover plates connected end to end in series to define a cartridge structure having an opening in an axial direction; and

a middle riser disposed radially within the barrel structure and joined to the plurality of peripheral cover plates by full perimeter full welds.

In some examples, the plurality of perimeter cover plates includes an upper arc cover plate, a rear support plate, a diagonal baffle plate, a rear baffle plate, an oil pan, a front support plate, a front end plate, and a front cover plate connected end to end, wherein,

the front cover plate is provided with an upper observation window assembly, the front cover plate is in sealing joint with the upper observation window assembly through a sealing ring, and

and the rear supporting plate is provided with a rear observation window assembly, and the rear supporting plate is in sealing connection with the rear observation window assembly through a sealing ring.

In some examples, the plunger pump power end housing further includes first and second gearbox covers sealingly engaged with the housing body at the opening by seal rings, the first and second gearbox covers projecting radially of the canister structure relative to the upper arc cover plate and the rear support plate.

In some examples, the seal rings are fixed to the front cover plate and the rear support plate by screw fixing holes, and the screw fixing holes are of a blind hole structure,

and/or the presence of a gas in the gas,

the seal ring is fixed on the first gearbox cover and the second gearbox cover through a thread fixing hole, and the thread fixing hole is of a blind hole structure.

In some examples, the upper viewing window assembly includes an upper viewing window support plate and a plurality of upper viewing window covers disposed on the upper viewing window support plate independently of each other,

the upper viewing window support plate is raised relative to the front cover plate.

In some examples, the rear viewing window assembly includes a plurality of rear viewing window covers independent of each other.

In some examples, an oil return port is formed in the oil pan, and the oil return port has a clip groove structure.

In some examples, a grease tube aperture is provided on the housing body, the grease tube aperture configured to allow a grease tube to extend within an interior of the plunger pump power end housing.

In some examples, the front end plate and the intermediate riser are made of a steel material having a yield strength greater than 600MPa, and

the first gearbox cover, the second gearbox cover, the upper observation window assembly, the rear observation window assembly and the sealing ring are made of aluminum alloy materials.

In some examples, the first gearbox cover and the second gearbox cover are respectively provided with a rotary oil seal seat, and one of the first gearbox cover and the second gearbox cover is also provided with an input shaft oil seal seat,

the rotary oil seal seat and the input shaft oil seal seat are respectively fixed on the corresponding gear box cover through fixing threaded holes arranged on the boss structures, and the fixing threaded holes are of blind hole structures.

The power end shell of the plunger pump provided by the embodiment of the disclosure has the following beneficial effects:

in the plunger pump power end shell provided by the embodiment of the disclosure, the middle vertical plate is designed to be welded with the peripheral cover plate of the shell body completely, so that a non-welded junction position between the middle vertical plate and the peripheral cover plate is eliminated, and further, the abnormal cracking of the vertical plate at the junction position in the operation process is avoided; the observation window and the shell body and the gearbox cover are sealed by adopting a sealing ring, and the thread fixing hole for fixing the sealing ring is designed into a blind hole structure, so that poor sealing caused by easy looseness and/or easy fracture abnormity of a fixing bolt is solved, and the lubricating oil emulsification abnormity caused by the fact that external liquid enters the interior of the power end shell is prevented; the handle structures are designed on the left and right gear case covers, so that the problem that the gear case covers are difficult to assemble and disassemble is solved, and the maintenance of plunger pump products is facilitated; the pipeline of the lubricating system is arranged in the power end shell, so that the lubricating pipeline is convenient to assemble and disassemble, and meanwhile, the protection of the lubricating pipeline is improved; the threaded fixing hole of the rotary oil seal seat is designed on the convex structure on the gearbox cover, so that the convenience of assembling the rotary oil seal seat is realized, and the assembling efficiency is improved; by sinking the upper arc cover plate of the shell body, moving the rear support plate of the shell body forwards, and by adopting light materials such as aluminum for non-bearing parts such as the observation window, the rotary oil seal seat and the gear box cover and only adopting high-strength steel materials for key bearing parts such as a middle vertical plate, two side vertical plates, a crankshaft bearing seat, a front end plate and a pinion shaft bearing seat in the shell body, the reliability of the power end shell is ensured, and the whole weight is reduced; the oil return port is designed into a clamp groove connection mode, so that the oil return port is convenient to assemble and disassemble, and the problems of oil leakage and oil leakage are avoided; by designing the single unitary viewing window assembly into a structure comprised of a plurality of independent viewing window covers, the convenience of viewing window disassembly and assembly is achieved.

Drawings

The above and other objects, features and advantages of the present disclosure will become more apparent by describing in more detail embodiments of the present disclosure with reference to the attached drawings. The accompanying drawings are included to provide a further understanding of the embodiments of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the principles of the disclosure and not to limit the disclosure. In the drawings, like reference numbers generally represent like parts or steps.

FIG. 1 is a front view block diagram of a plunger pump power end housing according to an embodiment of the present disclosure;

FIG. 2 is a rear view block diagram of a plunger pump power end housing according to an embodiment of the present disclosure;

FIG. 3 is a cross-sectional block diagram of a plunger pump power end housing showing a central riser and a peripheral cover plate in the housing body according to an embodiment of the present disclosure;

FIG. 4 is a schematic illustration of an assembled configuration of a plunger pump power end housing showing a gear pair, a rotary joint, a pinion shaft and a connecting rod crosshead assembly mounted within the housing in accordance with an embodiment of the present disclosure;

FIG. 5 is a schematic structural view of an upper viewing window assembly in a power end housing of a plunger pump according to an embodiment of the present disclosure, showing an upper viewing window support plate and an upper viewing window cover; and

fig. 6 is a schematic structural view of rotary oil seals disposed on left and right side gearbox covers in a plunger pump power end housing according to an embodiment of the present disclosure.

Reference numerals:

1: a right side gearbox cover; 2: a power end housing body; 3: a left side gearbox cover; 4: an upper viewing cover; 5: the hydraulic end is connected with a bolt; 6: a pull rod oil seal seat; 7: a lubricating oil pipe; 8: a gear box observation window cover; 9: rotating the oil seal seat; 10: a rear observation window cover; 11: an input shaft oil seal seat; 12: a handle; 13: a middle vertical plate; 14: a rear support plate; 15: an upper arc cover plate; 16: a front cover plate; 17: an upper observation window support plate; 18: a front end plate; 19: a front support plate; 20: an oil pan; 21: an oil return port; 22: a tailgate; 23: an inclined baffle plate; 24: a gear pair; 25: a rotary joint; 26: a pinion shaft; 27: a connecting rod crosshead assembly; 28: and an upper observation cover sealing ring.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings of the embodiments of the present disclosure. It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of protection of the disclosure.

Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

The inventor of this application discovers in the production practice, along with the trend development of domestic and foreign oil field operation operating mode to high pressure and big discharge capacity, a series of problems have also appeared in the field operation to the power end casing of plunger pump: the middle vertical plate of the power end shell is easy to crack abnormally at the welding junction position of the middle vertical plate and the peripheral cover plate; poor sealing of the observation window can cause the lubricating oil in the power end to be exposed, and meanwhile, external liquid can also enter the shell of the power end, so that the lubricating oil in the shell of the power end is emulsified, and the operation of the whole pump is influenced; the weight of the observation window cover easily causes the fracture abnormity of the fixing bolt of the observation window; the weight of the left and right gearbox covers makes the disassembly and assembly process very inconvenient and is not beneficial to maintenance; a lubricating system pipeline is usually designed on the outer side of a power end shell, so that the lubricating pipeline is inconvenient to assemble and disassemble and has poor protective performance; the installation mode of the rotary oil seal seat is inconvenient, and the assembly efficiency is low; non-load bearing members such as tie rod oil seals, rotary oil seals, sight windows, and gear box covers are also typically made of steel, resulting in a relatively heavy overall housing weight.

Embodiments of the present disclosure provide a plunger pump power end housing that can improve the reliability of the power end housing structure, the convenience of maintenance and lightweight of design, thereby better meeting the needs of current and future oilfield exploitation operations, particularly fracturing operations.

As shown in fig. 1-4, the plunger pump power end housing provided by the embodiment of the present disclosure mainly includes a housing body 2 and a first gearbox cover and a second gearbox cover that are in sealing engagement with the housing body 2, and is connected with a power end (not shown) by a power end connecting bolt 5. The housing body 2 is adapted to carry a gear pair 24, a rotary joint 25, a pinion shaft 26 and a connecting rod crosshead assembly 27 (not visible in fig. 1-3, shown in fig. 4) for reciprocating movement of the connecting rod crosshead assembly 27. The first gear box cover and the second gear box cover are respectively used for covering the gear pair 24 to realize the sealing of the gear pair. Hereinafter, the description will be given taking the first gearbox cover as the right-side gearbox cover 1 (see fig. 1) and the second gearbox cover as the left-side gearbox cover 3 as an example, but the embodiments of the present disclosure are not limited thereto.

As shown in fig. 3, the housing body 2 may include a plurality of peripheral cover plates that are sequentially connected end to form a cylindrical structure having an opening in the axial direction. The body 2 of the body of the shell also includes the intermediate riser 13 disposed in the tube structure radially, the intermediate riser 13 is jointed with a plurality of peripheral cover plates through the form of all-around welding. It should be noted that the number of the intermediate vertical plates 13 can be set according to the specification of the plunger pump, for example, a five-cylinder plunger pump can be provided with four intermediate vertical plates 13 to divide the cylinder structure of the housing body 2 into five cylinder chambers.

Still referring to fig. 3, the plurality of peripheral cover plates of the housing body 2 may include: an upper arc cover plate 15 forming the top of the cylinder structure; an oil pan 20 constituting the bottom of the above-described tube structure; and a rear support plate 14, a baffle 23, a rear baffle 22, a front support plate 19, a front end plate 18, and a front cover plate 16 that constitute the side portions of the above-described tubular structure. The upper arc cover plate 15, the rear support plate 14, the inclined baffle plate 23, the rear baffle plate 22, the oil pan 20, the front support plate 19, the front end plate 18 and the front cover plate 16 are connected end to end in sequence to define the cylinder structure of the shell body 2, and the middle vertical plate 13 is connected with the peripheral cover plates in a full-boundary full-welding mode.

As described above, in the power end housing of the plunger pump provided in the embodiment of the present disclosure, the middle vertical plate 13 is completely welded to the peripheral cover plate including the rear support plate 14, the upper arc cover plate 15, the front cover plate 16, the front end plate 18, the front support plate 19, the oil pan 20, the back baffle plate 22, and the inclined baffle plate 23. The full-boundary welding in the embodiment of the present disclosure means that the entire outer boundary (outer edge/outer rim) of the middle vertical plate 13 is connected with each peripheral cover plate contacted therewith by welding. Because the middle vertical plate 13 realizes full-boundary full welding, the welding stress effect is better, meanwhile, the non-welded junction position between the middle vertical plate and the peripheral cover plate is avoided, and further, the abnormal crack of the vertical plate at the junction position caused by the stress concentration at the non-welded junction position during the field operation of the plunger pump is avoided.

Still referring to fig. 1-2, the housing body 2 is sealingly engaged between the left-hand gearbox cover 3 (see fig. 2) and the right-hand gearbox cover 1 (see fig. 1) at the opening of the cartridge structure by means of a sealing ring. Compared with the sealing form of the sealing gasket in the prior art, the sealing in the sealing ring form provided by the embodiment of the disclosure can achieve better sealing effect, and the service life of the sealing ring is longer. The fixing bolt of the sealing gasket is not easy to screw in the assembling process, and vibration loosening and fracture abnormity are easy to occur in the operation process; in contrast, the fixing bolt of the seal ring can be easily tightened during the assembly process, so that vibration loosening or fracture abnormality is not easily generated during the operation process. In some examples, the sealing ring is fixed on the corresponding gear box cover through a threaded fixing hole, and the threaded fixing hole is a blind hole, so that external liquid is prevented from entering the interior of the power end shell to cause lubricating oil emulsification abnormity.

In the power end housing of the plunger pump provided by the embodiment of the present disclosure, as shown in fig. 1 to 4, the position of the upper arc cover plate 15 may be sunk and the position of the rear support plate 14 may be moved forward without interfering with other components of the power end housing. In other words, in the radial direction of the housing body 2, both the left-side gearbox cover 3 and the right-side gearbox cover 1 protrude with respect to the upper circular arc cover plate 15 and the rear support plate 14. Therefore, the weight of the power end shell body 2 is reduced, and meanwhile, the assembly distance of parts in the shell is shortened, so that the assembly operation and maintenance are facilitated.

Embodiments of the present disclosure provide a plunger pump power end housing in which, as shown in fig. 1, 3 and 4, an upper viewing window assembly is provided on the front cover plate 16, and the front cover plate 16 is in sealing engagement with the upper viewing window assembly, for example, by a sealing ring. In some examples, the upper viewing window assembly includes an upper viewing window support plate 17 and a plurality of upper viewing window covers 4 independent of each other. For example, five upper viewing window covers 4 independent of each other are shown in each of fig. 1, 3, and 4, but embodiments of the present disclosure are not limited thereto, and other numbers of upper viewing window covers independent of each other may be provided. The number of the upper observation window covers may be set according to the specification of the plunger pump, for example, a five-cylinder plunger pump may be provided with five upper observation window covers.

In some examples, as shown in fig. 5, the upper viewing window support plate 17 is designed to be a convex structure with respect to the front cover plate 16. Therefore, when the outside liquid flows through the convex position, the outside liquid can leak to the periphery due to the convex structure, thereby better sealing the upper observation window cover 4.

Embodiments of the present disclosure provide a plunger pump power end housing in which, as shown in fig. 2, a rear viewing window assembly is disposed on the rear support plate 14, and the rear support plate 14 is in sealing engagement with the rear viewing window assembly, such as by a gasket. In some examples, the rear viewing window assembly includes a plurality of rear viewing window covers 10 independent of each other. For example, fig. 2 shows five rear view window covers 10 independent of each other, but the embodiments of the present disclosure are not limited thereto, and other numbers of rear view window covers independent of each other may be provided. The number of rear view port covers may be set according to the specification of the plunger pump, for example, a five-cylinder plunger pump may be provided with five rear view port covers.

In the plunger pump power end housing provided by the embodiment of the present disclosure, as shown in fig. 1 and 2, independent gear box observation window covers 8 are respectively provided on the right-side gear box cover 1 and the left-side gear box cover 3, and the right-side gear box cover 1 and the left-side gear box cover 3 are respectively brought into sealing engagement with the gear box observation window covers 8, for example, by seal rings. In some examples, a single gear box observation window cover 8 is provided on each of the right and left gear box covers 1 and 3, but embodiments of the present disclosure are not limited thereto, and other numbers of gear box observation window covers 8 independent of each other may be provided.

In some examples, similar to the seal rings shown in fig. 1 and 2 for effecting sealing engagement between the housing body 2 and the left and right gearbox covers 3 (see fig. 1) and 1 (see fig. 2), the above-described seal rings for sealing the upper and rear sight covers 4, 10 and 8 are also fixed to the respective cover plates and the gearbox by threaded fixing holes, and the threaded fixing holes are blind holes, thereby preventing external liquid from entering the inside of the power end housing to cause lubrication oil emulsification abnormality.

As described above, the embodiment of the present disclosure provides a plunger pump power end housing, which is provided with a plurality of independent upper observation covers 4, a plurality of independent rear observation covers 10 and at least one independent gear box observation window cover 8, so as to observe key positions in the housing when the plunger pump power end is maintained and maintain, and provide an assembly space for disassembling internal components of the power end.

In some examples, the upper viewing cover 4 and the rear window cover 10 may be made of aluminum alloy or other lightweight material to reduce weight, considering that they are both non-load bearing. The known art typically employs a unitary window cover structure and seals with gaskets. An integral observation window cover structure is generally heavy, and as mentioned above, the fixing bolt of the sealing gasket is not easy to screw, which causes that the fixing bolt is more easy to break abnormally due to the weight of the integral observation window cover structure in the operation process; moreover, when the observation window cover is maintained on site, the whole observation window cover needs to be detached completely, and the detachment and the installation are inconvenient. In the embodiment of the disclosure, the weight of the rear observation window cover is reduced by optimizing the integral observation window cover structure into a plurality of independent observation window cover structures and adopting an aluminum alloy material or other light materials; furthermore, the sealing ring is adopted to replace a sealing gasket in the prior art, so that the fixing bolt on the sealing ring can be conveniently screwed in the assembling process, and the abnormal vibration loosening of the fixing bolt in the operation process is prevented; in addition, can disassemble appointed observation window lid alone as required, make things convenient for dismouting and maintenance.

In the plunger pump power end housing provided by the embodiments of the present disclosure, as also shown in fig. 1-2, a handle 12 may be provided on the right-hand gearbox cover 1 and the left-hand gearbox cover 3. Because the gearbox cover is generally heavier and has no good force application point, the gearbox cover is very difficult to assemble and disassemble in the assembling and after-sale disassembling processes. The plunger pump power end shell provided by the embodiment of the disclosure is provided with the handle structures on the left and right gear case covers, so that the disassembly, assembly, maintenance and repair of the left and right gear case covers are facilitated.

In the power end housing of the plunger pump provided by the embodiment of the disclosure, as shown in fig. 1-2 and combined with fig. 6, the right side gearbox cover 1 and the left side gearbox cover 3 are respectively provided with a rotary oil seal seat 9; the left gearbox cover 3 is also provided with an input shaft oil seal seat 11; and the front end plate 18 is provided with a pull rod oil seal seat 6. The rod oil seal holder 6, the rotary oil seal holder 9, and the input shaft oil seal holder 11 are used for mounting oil seal materials, and also have a sealing function for the connecting rod crosshead assembly 27, the rotary joint 25, and the pinion shaft 26. It should be noted here that although fig. 2 and 6 show the input shaft oil seal 11 being disposed on the left-side gearbox cover 3, the embodiments of the present disclosure are not limited thereto, and the input shaft oil seal 11 may be disposed on the right-side gearbox cover 1 according to the specific configuration of the power end of the plunger pump.

In some examples, as also shown in fig. 1 and 2 and in connection with fig. 6, the above-mentioned rotary oil seal 9 and input shaft oil seal 11 are designed to be fixed on the respective gearbox cover by means of fixing threaded holes provided on the boss structure, and the fixing threaded holes are designed as blind holes. From this, through the boss structure with the fixed screw hole design of oil seal seat on the gear case lid and through being the blind hole structure with the design of thread fixing hole, when making things convenient for the assembly of this rotatory oil seal seat 9 and input shaft oil seal seat 11, also guaranteed the protectiveness of thread fixing hole position.

Embodiments of the present disclosure provide a plunger pump power end housing in which, as shown in fig. 1, 3, and 4, corresponding positions of the left-side gearbox cover 3, the housing body 2, and the right-side gearbox cover 1 are respectively provided with lube hole holes configured to allow a lube pipe 7 to extend inside the power end housing. For example, the corresponding positions of the left gearbox cover 3, the middle vertical plate 13 and the right gearbox cover 1 are respectively provided with lubricating oil pipe holes. In other words, in embodiments of the present disclosure, the lubrication line is disposed inside the power end housing. From this, compare in the known art in with the lubricated pipeline design outside power end casing, through the design with the lubrication pipeline is built-in, the required material of lubricated pipeline assembly still less, has made things convenient for the assembly and the dismantlement of lubricated pipeline, has also promoted the protection of lubricated pipeline simultaneously.

In the plunger pump power end housing provided by the embodiment of the present disclosure, as shown in fig. 3, an oil return port 21 is provided on an oil pan 20 at the bottom of the housing body 2, and the oil return port 21 is designed to have a clip groove structure. Therefore, the oil return pipe can be directly connected with an oil return pipeline of the whole machine in a clamping manner, so that the problems of oil leakage and oil leakage are thoroughly solved. The reason is that the oil return port of the known technology is usually designed in a NPT internal thread structure form, an oil return joint with a NPT external thread at one end and a hoop groove structure at the other end needs to be independently assembled in the whole machine assembly, and a pipe wrench needs to be used for dismounting and screwing in the dismounting process, so that the field dismounting is very difficult, the pipe joint clamp is easy to deform, and the oil leakage problem of the oil return port is caused.

In the power end housing of the plunger pump provided by the embodiment of the disclosure, on one hand, the middle vertical plate 13 and the front end plate 18 constituting the housing body 2, and the vertical plates at two sides, the crankshaft bearing seat, the pinion shaft bearing seat and the like which are not shown in the drawings belong to key bearing pieces, and can be made of steel materials with yield strength greater than 600MPa, so as to ensure the stability and reliability of the power end housing; on the other hand, similar to the upper observation cover 4 and the rear observation window cover 10, the right and left gearbox covers 1 and 3, the gearbox observation window cover 8, the pull rod oil seal seat 6, the rotary oil seal seat 9, the input shaft oil seal seat 11, and the like are all non-bearing members and can be made of aluminum alloy materials or other light materials so as to further reduce the overall weight of the power end housing. Therefore, the key bearing piece and the non-bearing piece of the power end shell are made of different materials, so that the overall weight can be reduced while the stability and the reliability are ensured.

In summary, in the plunger pump power end housing provided in the embodiment of the present disclosure, the middle vertical plate is designed to be welded to the peripheral cover plate of the housing body, so as to eliminate the non-welded junction position between the middle vertical plate and the peripheral cover plate, thereby avoiding the abnormal cracking of the vertical plate at the junction position during the operation; the observation window and the shell body and the gearbox cover are sealed by adopting a sealing ring, and the thread fixing hole for fixing the sealing ring is designed into a blind hole structure, so that poor sealing caused by easy looseness and/or easy breakage abnormity of the fixing bolt is solved, and the lubricating oil emulsification abnormity caused by the fact that external liquid enters the interior of the power end shell is prevented; the handle structures are designed on the left and right gear case covers, so that the problem that the gear case covers are difficult to assemble and disassemble is solved, and the maintenance of plunger pump products is facilitated; the pipeline of the lubricating system is arranged in the power end shell, so that the lubricating pipeline is convenient to assemble and disassemble, and meanwhile, the protection of the lubricating pipeline is improved; the threaded fixing hole of the rotary oil seal seat is designed on the convex structure on the gearbox cover, so that the convenience of assembling the rotary oil seal seat is realized, and the assembling efficiency is improved; by sinking the upper cover plate of the shell body and moving the rear support plate of the shell body forwards, and by adopting light materials such as aluminum for non-bearing parts such as an observation window, a rotary oil seal seat and a gearbox cover and adopting a mode of only adopting high-strength steel materials for key bearing parts in the shell body, the reliability of the power end shell is ensured, and meanwhile, the whole weight of the power end shell is reduced; the oil return port is designed into a clamp groove connection mode, so that the oil return port is convenient to assemble and disassemble, and the problems of oil leakage and oil leakage are avoided; by designing the single unitary viewing window assembly into a structure comprised of a plurality of independent viewing window covers, the convenience of viewing window disassembly and assembly is achieved. Therefore, the power end shell provided by the embodiment of the disclosure can improve the reliability of the structure, the convenience of maintenance and light weight of design, thereby better meeting the requirements of current and future oilfield exploitation, especially fracturing operation.

The foregoing is illustrative of the present invention and is not to be construed as limiting thereof. Although a few exemplary embodiments of this invention have been described, those skilled in the art will readily appreciate that many modifications are possible in the exemplary embodiments without materially departing from the novel teachings and advantages of this invention. Accordingly, all such modifications are intended to be included within the scope of this invention as defined in the claims. It is to be understood that the foregoing is illustrative of the present invention and is not to be construed as limited to the specific embodiments disclosed, and that modifications to the disclosed embodiments, as well as other embodiments, are intended to be included within the scope of the appended claims. The invention is defined by the claims and their equivalents.